Updated on 2024/02/12

写真a

 
TSUCHIKAWA, Satoru
 
Organization
Graduate School of Bioagricultural Sciences Department of Forest and Environmental Resources Sciences Professor
Graduate School
Graduate School of Bioagricultural Sciences
Undergraduate School
School of Agricultural Sciences
Title
Professor
Contact information
メールアドレス

Degree 2

  1. 博士(農学) ( 1998.3   名古屋大学 ) 

  2. 農学修士 ( 1989.3   名古屋大学 ) 

Research Areas 3

  1. Life Science / Wood science  / Wood Science

  2. Environmental Science/Agriculture Science / Agricultural environmental engineering and agricultural information engineering  / Agricultural Information Engineering

  3. Nanotechnology/Materials / Analytical chemistry  / Applied Optics

Current Research Project and SDGs 3

  1. Study on Optical Metrology of Biological Materials by Time of Flight Spectroscopy

  2. Study on Non-destructive Measurement of Biological Materials by Near Infrared Spectroscopy

  3. Study on Improvement of Wood Working Processes

Research History 14

  1. 北京林業大学   客員教授

    2024

      More details

    Country:China

  2. 華中農業大学   客員教授

    2023.12

      More details

    Country:China

  3. 西南林業大学   客員教授

    2021

      More details

    Country:China

  4. Nagoya University   Graduate School of Bioagricultural Sciences   Dean

    2019.4 - 2023.3

  5. 日本学術振興会 学術システム研究センター 専門研究員

    2013.4 - 2016.3

      More details

    Country:Japan

  6. Professor, Graduate School of Bioagricultural Sciences, Nagoya University

    2004.11

      More details

    Country:Japan

  7. 文部科学省 在外研究員

    2001.12 - 2002.10

      More details

    Country:Japan

  8. Ministry of Education,Culture,Sports,Science and Technology

    2001.12 - 2002.10

      More details

    Country:Japan

  9. Research Associate, Graduate School of Bioagricultural Sciences, Nagoya University

    1999.4 - 2004.11

      More details

    Country:Japan

  10. 通産省工業技術院 名古屋工業技術研究所 流動研究員

    1999.4 - 2000.3

      More details

    Country:Japan

  11. Research Associate, School of Agriculture, Nagoya University

    1990.4 - 1999.3

      More details

    Country:Japan

  12. Research Associate, School of Agriculture, Nagoya University

    1990.4 - 1999.3

      More details

    Country:Japan

  13. Teijin Seiki Co.

    1989.4 - 1990.3

      More details

    Country:Japan

  14. Teijin Seiki Co.

    1989.4 - 1990.3

      More details

    Country:Japan

▼display all

Education 2

  1. Nagoya University   Graduate School, Division of Agriculture

    - 1989.3

      More details

    Country: Japan

  2. Nagoya University   Faculty of Agriculture

    - 1987.3

      More details

    Country: Japan

Professional Memberships 16

  1. Asian Association of Agricultural Colleges and Universities   President

    2022.7 - 2024.11

  2. 日本木材学会   会長、代表理事

    2021.6 - 2023.6

  3. Bio Tech TOKAI

    2019.6 - 2023.6

  4. 日本木材学会   副会長、理事

    2019.6 - 2021.6

  5. The International Council for of Near-Infrared Spectroscopy   Management committee

    2019.10

  6. Asian NIR Consortium   President

    2018.6

  7. 近赤外研究会   会長

    2016.12 - 2020.11

  8. 日本分光学会

  9. 日本木材加工技術協会

  10. Asian Association of Agricultural Colleges and Universities

    2022.7 - 2024.11

  11. 日本木材学会

    2021.6 - 2023.6

  12. The International Council for of Near-Infrared Spectroscopy

    2019.10

  13. 日本木材学会

    2019.6 - 2021.6

  14. 日本分光学会

  15. 日本食品科学工学会

  16. 精密工学会

▼display all

Committee Memberships 2

  1. 林野庁   林政審議会委員  

    2023.2   

      More details

    Committee type:Government

  2. 大学改革支援・学位授与機構   国立大学教育研究評価委員会委員  

    2023.4   

      More details

    Committee type:Government

Awards 11

  1. Doctor Honoris Causa

    2024.2   University od Sopron  

     More details

    Country:Hungary

  2. the Gerald S. Birth Award

    2018.8   The council for Near Infrared Spectroscopy  

     More details

    Award type:International academic award (Japan or overseas)  Country:United States

  3. 平成29年度紙パルプ技術協会賞

    2018.10   紙パルプ技術協会  

    河部千香、深沢博之, 稲垣哲也

     More details

    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  4. 平成29年度印刷朝暘会賞

    2018.10   一般財団法人印刷朝陽会  

    河部千香、深沢博之, 稲垣哲也

     More details

    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  5. Tomas Hirschfeld Award

    2017.6   The International Council for Near Infrared Spectroscopy  

     More details

    Award type:International academic award (Japan or overseas)  Country:Denmark

  6. The shield of honor award

    2017.4  

     More details

    Country:Thailand

  7. 日本木材学会賞

    2004.2   日本木材学会  

     More details

    Country:Japan

  8. Buchi NIR Award

    2003.10   Buchi Labottechnik  

  9. PerkinElmer Awards

    2003.4   Organizing Committee of NIR 2003  

  10. 林業科学技術振興賞

    2003.5   財団法人林業科学技術振興所  

     More details

    Country:Japan

  11. NIR Advance Award

    1998.11   日本食品科学工学会  

     More details

    Country:Japan

▼display all

 

Papers 516

  1. Three-dimensional visualization and detection of early bruise in apple based on near-infrared hyperspectral imaging coupled with geometrical influence correction Reviewed

    Li B., Ma T., Bai L., Inagaki T., Seki H., Tsuchikawa S.

    Postharvest Biology and Technology   Vol. 210   2024.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Postharvest Biology and Technology  

    Visible-near-infrared (Vis-NIR) spectral imaging holds great promise for the automatic detection of fruit defects. However, uneven brightness resulting from fruit geometry and the limitations of one-directional imaging significantly restrict the current detection to a limited area. This study presents a rotation measurement system that combines a line-scan NIR-hyperspectral imaging (HSI) camera with a laser profile. A total of 72 apple samples with bruises in the central and edge regions were prepared. A 360° scanning approach was employed to collect HSI and shape data from the entire surface of the samples over a 6-h post-bruising period. Height and angle corrections were applied to eliminate the surface geometric influences on the HSI data, resulting in improved reflectance spectrum uniformity. A two-step principal component analysis method was employed for image enhancement, followed by a straightforward bruise detection technique using global segmentation and connected-domain selection. The results demonstrated an overall improvement in bruise detection over time. Moreover, the correction significantly enhanced the detection accuracy. After 6 h of bruising, the corrected data achieved a classification accuracy of 90.3% and an identification rate of 83.3% for central bruises and 61.1% for edge bruises, whereas the uncorrected data yielded 70.8%, 58.3%, and 31.9%, respectively. Thus, this study successfully detected early bruising across the entire surface of apples and improved the detection in low-intensity edge areas. The proposed method has the potential to contribute to the comprehensive evaluation of agricultural products with irregular geometries.

    DOI: 10.1016/j.postharvbio.2023.112753

    Scopus

  2. Three-dimensional modeling of moisture transport in wood using near-infrared hyperspectral imaging and X-ray computed tomography in conjunction with finite element analysis Reviewed

    Zeng, WP; Fujimoto, T; Inagaki, T; Tsuchikawa, S; Ma, T

    JOURNAL OF WOOD SCIENCE   Vol. 70 ( 1 )   2024.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    In past studies, finite element analysis (FEA) methods have been used to simulate the thermal and moisture coupling of wood. However, challenges remain in achieving high-quality three-dimensional (3D) simulations, mainly because of the heterogeneous and complex structure of wood and its difficult-to-detect internal structure, which makes modeling challenging, in addition to the lack of robust experimental techniques to validate simulation results. In this study, the FEA simulation model was refined by combining X-ray computed tomography (CT) and near-infrared hyperspectral imaging (NIR-HSI). CT was used to probe the 3D density of wood, and a novel FEA tetrahedral mesh was constructed based on the results. The NIR-HSI method visualizes the moisture distribution during adsorption and desorption inside the wood. This result is then used to adjust the parameters of the FEA simulation model and as a reference value to evaluate the simulation results. The visualization and simulation results fit well with the theoretical properties. The simulation results can more accurately reflect the spatial distribution and transfer trend of wood moisture at different points in time. Therefore, the CT and NIR-HSI-based 3D heat and moisture-coupled FEA model of wood proposed in this study can be used as a basis for optimizing drying parameters to provide high-quality wood.

    DOI: 10.1186/s10086-023-02120-2

    Web of Science

    Scopus

  3. Primary assessment of macronutrients in durian (CV Monthong) leaves using near infrared spectroscopy with wavelength selection. Reviewed

    Phanomsophon T, Jaisue N, Worphet A, Tawinteung N, Khurnpoon L, Lapcharoensuk R, Krusong W, Pornchaloempong P, Sirisomboon P, Inagaki T, Ma T, Tsuchikawa S

    Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy   Vol. 304   page: 123398   2024.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy  

    Farmers would be able to regulate fertilization and produce quality durian if they knew the nutrient concentration in durian leaves. A long period of time for traditional nutritional content determination is needed. Therefore, near-infrared spectroscopy is a good method for nondestructive and quick nutrient content evaluation. The leaf sample matrices (fresh leaves, dried ground leaves, and dried ground leaf pellets) were scanned by Fourier transform near-infrared (FT-NIR) with a wavelength of 12,500–3,600 cm−1. Regression models were developed using partial least squares (PLS) with full wavelength, short wavelength, and selected wavelength by successive projections algorithm (SPA). In this study, the model for N and K concentration was acceptable and the prediction was considered good but for P content not had succeeded. As a result, the PLS-SPA model using fresh leaf samples for evaluating N content in durian leaves exhibited performance of r2 = 0.852, SEP = 0.14%, RPD = 2.63 and bias = −0.020%. The PLS-SPA model using dried ground leaf samples for evaluating K content in durian leaves exhibited performance of r2 = 0.820, SEP = 0.13%, RPD = 2.36 and bias = 0.006%. This research found that it is possible to apply NIR waves to predict N and K concentrations in durian leaves. It is not necessary to predict directly from the wavelengths associated with -N or -K bonds. Instead, NIR can measure them indirectly from the bonding of proteins, which are products formed by N and K. In addition, selecting the wavelength that is related to the value to be measured can produce results that are not significantly different from using full or short wavelengths. These models can assist farmers in rapidly predicting N and K content in durian leaves for immediate fertilizer adjustment.

    DOI: 10.1016/j.saa.2023.123398

    Scopus

    PubMed

  4. Classification of the Crosslink Density Level of Para Rubber Thick Film of Medical Glove by Using Near-Infrared Spectral Data Reviewed

    Jongyingcharoen, JS; Howimanporn, S; Sitorus, A; Phanomsophon, T; Posom, J; Salubsi, T; Kongwaree, A; Lim, CH; Phetpan, K; Sirisomboon, P; Tsuchikawa, S

    POLYMERS   Vol. 16 ( 2 )   2024.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Polymers  

    Classification of the crosslink density level of para rubber medical gloves by using near-infrared spectral data combined with machine learning is the first time reported in this paper. The spectra of medical glove samples with different crosslink densities acquired by an ultra-compact portable MicroNIR spectrometer were correlated with their crosslink density levels, which were referencely evaluated by the toluene swell index (TSI). The machine learning protocols used to classify the 3 groups of TSI were specified as less than 80% TSI, 80–88% TSI, and more than 88% TSI. The 80–88% TSI group was the group in which the compounded latex was suitable for medical glove production, which made the glove specification comply with the requirements of customers as indicated by the tensile test. The results show that when comparing the algorithms used for modeling, the linear discriminant analysis (LDA) developed by 2nd derivative spectra with 15 k-best selected wavelengths fairly accurately predicted the class but was most reliable among other algorithms, i.e., artificial neural networks (ANN), support vector machines (SVM), and k-nearest neighbors (kNN), due to higher prediction accuracy, precision, recall, and F1-score of the same value of 0.76 and no overfitting or underfitting prediction. This developed model can be implemented in the glove factory for screening purposes in the production line. However, deep learning modeling should be explored with a larger sample number required for better model performance.

    DOI: 10.3390/polym16020184

    Web of Science

    Scopus

    PubMed

  5. Characteristics of Resonance Sound in a Circular Saw Enclosure Reviewed

    Takeyama, K; Yokochi, H; Nishio, S; Tsuchikawa, S

    BIORESOURCES   Vol. 18 ( 4 ) page: 8473 - 8483   2023.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:BioResources  

    Several studies have been conducted to reduce the idling noise of circular saws because the sound level is extremely high and harms the environment. However, conventional noise suppression technology only controls the vibrations of the circular saw itself, whereas idling noise can be generated when the air inside the enclosure is resonant. In this study, the relationship between the rotational speeds of the circular saw blade and the frequencies of the resonance sound when the circular saw blade is running idle in an enclosure was examined. Additionally, the sound pressure modes and frequencies of the air in the enclosure were analyzed using the finite element method of acoustic analysis. The results showed that resonance sound was generated only when the circular saw blade was enclosed. The frequencies of the resonance sound generated by a circular saw blade made of acrylic plastic were the same as those generated by a steel saw blade. The resonance sound was generated regardless of the outer diameter of the circular saw blade. The peak resonant frequencies formed a step-like line during the analysis in which the rotational speed of the saw blade was steadily increased.

    DOI: 10.15376/biores.18.4.8473-8483

    Web of Science

    Scopus

  6. Thermal behavior of heat-treated wood using two-dimensional correlation of near-infrared spectroscopy and differential scanning calorimetry Reviewed

    Mahdiyanti, SH; Inagaki, T; Ridho, MR; Marsoem, SN; Tsuchikawa, S

    WOOD SCIENCE AND TECHNOLOGY   Vol. 57 ( 6 ) page: 1485 - 1506   2023.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wood Science and Technology  

    Heat treatment of wood can decrease its heat capacity and thermal transitions, which are thermal behavior properties of wood. A calorimetric study that highlights the thermal behavior of the molecular mobility of materials is necessary to investigate the thermal degradation of wood. Furthermore, combining it with a nondestructive measurement technique would widen its scope of applicability, especially for wood in service or historical wood that cannot be altered or damaged by invasive methods. Neolamarckia cadamba (Roxb.) Bosser, also known as burflower-tree, a tropical fast-growing hardwood species that has become popular for light-construction works in the past decade, is treated at 90, 120, and 150 ℃ for a duration of 8 h to 3.5 months, scheduled logarithmically. Near-infrared spectroscopy and differential scanning calorimetry (DSC) were used to measure the chemical changes and thermal behavior of the wood before and after heat treatment. Two-dimensional correlation spectroscopy (2DCOS) analysis was then applied to assess the NIR second-derivative spectra and DSC thermograms. The results showed that 2DCOS analysis could assess NIR second-derivative spectra and DSC thermograms under careful observation, as DSC thermograms comprise both qualitative and quantitative information. It provides a new point of view in the non-destructive analysis of wood thermal degradation.

    DOI: 10.1007/s00226-023-01506-1

    Web of Science

    Scopus

  7. Review of near infrared hyperspectral imaging applications related to wood and wood products Reviewed

    Laurence Schimleck, Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY REVIEWS   Vol. 58 ( 9 ) page: 585 - 609   2023.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS INC  

    Hyperspectral imaging is a technique that combines spectroscopy and imaging. Originally utilized in the 1980's by the remote sensing community it is now utilized in a wide variety of applications. Spectral imaging was first used for the detection of compression wood in the late 1990's and since that time research focused on wood and wood products has steadily increased with a variety of applications reported. While there are several reviews of wood related research utilizing near infrared spectrometers a comprehensive summary of wood-hyperspectral imaging research is lacking. Near infrared hyperspectral imaging systems (NIR-HSI) typically have a wavelength range of 900-1700 nm, whereas short-wave infrared hyperspectral imaging (SWIR-HSI) systems range from 1000 to 2500 nm. We provide a detailed account of the various studies that have been published utilizing both camera types.

    DOI: 10.1080/05704928.2022.2098759

    Web of Science

    Scopus

  8. Validation study on light scattering changes in kiwifruit during postharvest storage using time-resolved transmittance spectroscopy Reviewed

    Ma, T; Inagaki, T; Tsuchikawa, S

    SCIENTIFIC REPORTS   Vol. 13 ( 1 ) page: 16556   2023.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Scientific Reports  

    Visible and near-infrared spectroscopy has been well studied for characterizing the organic compounds in fruit and vegetables from pre-harvest to late harvest. However, due to the challenge of decoupling of optical properties, the relationship between the collected samples’ spectral data and their properties, especially their mechanical properties (e.g., firmness, hardness, and resilience) is hard to understand. This study developed a time-resolved transmittance spectroscopic method to validate the light scattering changing characteristics in kiwifruit during shelf-life and in cold storage conditions. The experimental results demonstrated that the reduced scattering coefficient (μs′) of 846 nm inside kiwifruit decreased steadily during postharvest storage and is more evident under shelf-life than in cold storage conditions. Moreover, the correlation between the μs′ and the storage time was confirmed to be much higher than that using the external color indexes measured using a conventional colorimeter. Furthermore, employing time-resolved profiles at this single wavelength, an efficacious mathematical model has been successfully formulated to classify the stages of kiwifruit softening, specifically early, mid-, and late stages. Notably, classification accuracies of 84% and 78% were achieved for the shelf-life and cold storage conditions, respectively.

    DOI: 10.1038/s41598-023-43777-5

    Web of Science

    Scopus

    PubMed

  9. Application of Near-Infrared Spectroscopy to Forest and Wood Products Reviewed

    Tsuchikawa, S; Inagaki, T; Ma, T

    CURRENT FORESTRY REPORTS   Vol. 9 ( 6 ) page: 401 - 412   2023.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Current Forestry Reports  

    Purpose of Review: Forest and wood products are often characterized by a uniformity of quality attributes, which necessitates the development of rapid and non-destructive quality evaluation methods to ensure their optimal quality. Near-infrared spectroscopy (NIRS) represents a highly suitable approach for the characterization of organic compounds, and is generally combined with sophisticated multivariate analysis methods. This review article presents a range of scientific and technical reports showcasing the successful use of NIRS for evaluating forest and wood products, mainly published within the past 5 years. Recent Findings: Continuous advancements in spectral imaging techniques and the integration of big-data analytics have greatly enhanced the capabilities of NIR instrumentation, enabling its widespread application across diverse fields. Although NIR spectral imaging methods do have some limitations when it comes to online grading, they can still be used to test small quantities of samples at a batch level. Moreover, the ever-increasing use of handheld devices has made NIRS easily accessible. Summary: We aim to provide a summary of new research in basic spectroscopic research, integrating the improvements of spectral imaging methods and big-data analytics. Furthermore, low-cost and portable devices have been produced, enabling remote analysis and further expanding the scope of NIRS applications. Looking forward, we anticipate that continued advancements in this field will enable even wider applications of NIRS for online or at-line quality monitoring in diverse fields.

    DOI: 10.1007/s40725-023-00203-3

    Web of Science

    Scopus

  10. Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    Holzforschung   Vol. 77 ( 9 ) page: 724 - 733   2023.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    Abstract

    Conventional fluorescence spectroscopy has been suggested as a valuable tool for classifying wood species rapidly and non-destructively. However, because it is challenging to conduct absolute emission intensity measurements, fluorescence analysis statistics are difficult to obtain. In this study, another dimension of fluorescence, that is, fluorescence lifetime, was further evaluated to address this issue. A time-resolved fluorescence spectroscopic measurement system was first designed, mainly using a streak camera, picosecond pulsed laser at 403 nm, and a spectroscope, to collect the fluorescence time-delay (FTD) profiles and steady-state fluorescence intensity (FI) spectra simultaneously from 15 wood species. For data analysis, principal component analysis was used to “compress” the mean-centered FTD and FI spectra. Then, support vector machine classification analysis was utilized to train the wood species classification model based on their principal component scores. To avoid overfitting, ten-fold cross-validation was used to train the calibration model using 70 % of the total samples, and the remaining 30 % hold-out validation was used to test its reproducibility. The cross-validation accuracies were 100 % (5 softwoods) and 96 % (10 hardwoods), with test-validation accuracies of 96 % and 89 %.

    DOI: 10.1515/hf-2023-0017

    Web of Science

    Scopus

    Other Link: https://www.degruyter.com/document/doi/10.1515/hf-2023-0017/pdf

  11. Development of a sensitivity-enhanced chlorophyll fluorescence lifetime spectroscopic method for nondestructive monitoring of fruit ripening and postharvest decay Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    POSTHARVEST BIOLOGY AND TECHNOLOGY   Vol. 198   2023.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Nondestructive monitoring of the environmental changes around fluorescent molecules in postharvest fruit is highly informative for monitoring their ripening and early decay process. In this study, a time-resolved laser-induced fluorescence (TRLIF) spectroscopic system, including a streak camera, spectrometer, and 403 nm picosecond-pulsed laser, was first developed. Then, representative pigments in photosynthesis (chlorophyll a, chlorophyll b, and carotenoids liquid samples) were initially measured and studied to determine whether the developed TRLIF spectroscopic system could produce the characteristics of chlorophyll fluorescence decay traces. Finally, the same approach was tested to monitor the ripening and early decay processes of each three samples of avocado and strawberry. The overall findings demonstrated that the fluorescence lifetime (FLT) of the fruit samples declined steadily during the shelf-life storage. For the avocados samples, the average FLT loss at the wavelength range of 706-749 nm decreased by approximately 23 % and 31 % at 1 and 2 d under shelf-life storage, respectively. For the strawberry samples, the average FLT loss at the wavelength range of 631-706 nm decreased by approximately 22 %, 46 %, 68 %, and 73 % at 0.5, 1, 1.5, and 2 d under the same shelf-life storage condition. This study indicates that the developed TRLIF spectroscopic method is potentially robust and accurate for assessing the ripening and early decay process of various climacteric and non-climacteric fruit.

    DOI: 10.1016/j.postharvbio.2022.112231

    Web of Science

    Scopus

  12. Visualization of Sugar Content Distribution of White Strawberry by Near-Infrared Hyperspectral Imaging Reviewed

    Hayato Seki, Te Ma, Haruko Murakami, Satoru Tsuchikawa, Tetsuya Inagaki

    Foods   Vol. 12 ( 5 )   2023.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    In this study, an approach to visualize the spatial distribution of sugar content in white strawberry fruit flesh using near-infrared hyperspectral imaging (NIR-HSI; 913–2166 nm) is developed. NIR-HSI data collected from 180 samples of “Tochigi iW1 go” white strawberries are investigated. In order to recognize the pixels corresponding to the flesh and achene on the surface of the strawberries, principal component analysis (PCA) and image processing are conducted after smoothing and standard normal variate (SNV) pretreatment of the data. Explanatory partial least squares regression (PLSR) analysis is performed to develop an appropriate model to predict Brix reference values. The PLSR model constructed from the raw spectra extracted from the flesh region of interest yields high prediction accuracy with an RMSEP and (Formula presented.) values of 0.576 and 0.841, respectively, and with a relatively low number of PLS factors. The Brix heatmap images and violin plots for each sample exhibit characteristics feature of sugar content distribution in the flesh of the strawberries. These findings offer insights into the feasibility of designing a noncontact system to monitor the quality of white strawberries.

    DOI: 10.3390/foods12050931

    Web of Science

    Scopus

    PubMed

  13. Colour Modification of Wood by Dry Thermal Treatment between 90 <sup>o</sup>C and 200 <sup>o</sup>C Reviewed

    Preklet E., Tolvaj L., Tsuchikawa S., Varga D.

    Acta Silvatica et Lignaria Hungarica   Vol. 19 ( 1 ) page: 9 - 20   2023

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Acta Silvatica et Lignaria Hungarica  

    The colour modification effect of dry thermal treatment was studied in black locust (Robinia pseudoacacia L.), poplar (Populus x euramericana cv. Pannonia), Scots pine (Pinus sylvestris L.), spruce (Picea abies Mill.) and larch (Larix decidua L.) species in the temperature range 90-200 °C. Colour data were presented and evaluated in the CIE L*a*b* coordinate system. All thermal treatments applied altered the wood colour throughout the entire cross section regardless of the treatment temperature. At lower temperatures, wood extractives played a decisive role in colour change. The degradation products of hemicelluloses were the major determinant of the change in lightness at 200°C. Redness change in percentage showed much greater alteration than the yellowness and the lightness change. Spruce presented the greatest chromaticity coordinate (a* and b*) alteration among the investigated species. Changes in redness and yellowness followed the Arrhenius law during the investigated dry thermal treatments confirming that the temperature dependence of these colour parameters is exponential for wood material.

    DOI: 10.37045/aslh-2023-0001

    Scopus

  14. Experimental study and three-dimensional modeling of moisture transport in wood by means of near-infrared hyperspectral imaging coupled with a heat and mass transfer simulation method Reviewed

    Te Ma, Genki Morita, Tetsuya Inagaki, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 76 ( 8 ) page: 699 - 710   2022.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    Substantial efforts have been undertaken for visualizing and simulating the characteristics of water movement in wood. However, three-dimensional (3D) thermo-hygric simulations still pose challenges, not only because wood has a heterogeneous microstructure that results in complex computational models but also because there is a lack of proper experimental techniques to support and validate the model constructions. In this study, the moisture distribution in wood during the water adsorption and desorption processes was first visualized using a near-infrared hyperspectral imaging (NIR-HSI) method that has high resolution, sensibility, and stability. Then, based on the moisture visualization results, the main parameters of a mass transfer simulation code were varied. The visualization and simulation results were confirmed to match well with the main characteristics; e.g., drying speed was slower in the wood parts with higher densities. Additionally, there was a relatively large gradient over the surface layer of the wood samples as the drying progressed, whereas this was not an obvious feature in the water adsorption process. Hence, this study proposes that the NIR-HSI method can be combined with thermo-hygric and 3D simulation model construction. Such an approach provides the basis for optimizing drying conditions and providing high-quality wood products.

    DOI: 10.1515/hf-2021-0203

    Web of Science

    Scopus

    CiNii Research

  15. Cognitive spectroscopy for the classification of rice varieties: A comparison of machine learning and deep learning approaches in analysing long-wave near-infrared hyperspectral images of brown and milled samples Reviewed International coauthorship

    Onmankhong J, Ma T, Inagaki T, Sirisomboon P, Tsuchikawa S

    Infrared Physics and Technology   Vol. 123   page: 104100 - 104100   2022.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Rapid and non-destructive detection of genuine Thai Jasmine rice (Khao Dawk Mali 105 (KDML105)) from Pathum Thani1 (PTT1) and Phitsanulok2 (PSL2) under either milled or brown conditions is required to disrupt fraudulent. This study aimed to resolve this real issue using long-wave near infrared hyperspectral imaging (NIRHSI) coupled with machine learning and deep learning approaches. The best classification accuracy for the milled rice was achieved using the spectral imaging-based analysis on the NIR-HSI data with selected wavelength, approximately 95% for the test set either by convolutional neural network or support vector machine (SVM), whereas for the brown rice, the SVM model based on the averaged NIR spectra could achieve the best classification accuracy of 95.4%. It suggests the chemical component difference and its spatial distribution in the milled rice could contribute higher classification accuracy. Additionally, the surface bran effects of brown rice could be reduced by using averaged spectral data coupled with the SVM method.

    DOI: 10.1016/j.infrared.2022.104100

    Web of Science

    Scopus

    CiNii Research

  16. Comparative Performance of NIR-Hyperspectral Imaging Systems Invited Reviewed International coauthorship

    Ma Te, Schimleck Laurence, Dahlen Joseph, Yoon Seung-Chul, Inagaki Tetsuya, Tsuchikawa Satoru, Sandak Anna, Sandak Jakub

    Foundations     2022.6

     More details

    Language:English  

  17. Comparative Performance of NIR-Hyperspectral Imaging Systems Invited Reviewed International coauthorship

    Ma Te, Schimleck Laurence, Dahlen Joseph, Yoon Seung-Chul, Inagaki Tetsuya, Tsuchikawa Satoru, Sandak Anna, Sandak Jakub

    Foundations     2022.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  18. Production of Nanocellulose Film from Abaca Fibers Reviewed International coauthorship

    Anniver Ryan Lapuz, Satoru Tsuchikawa, Tetsuya Inagaki, Te Ma, Veronica Migo

    CRYSTALS   Vol. 12 ( 5 )   2022.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:MDPI  

    Abaca fibers were subjected to a TEMPO mediated oxidation to extract nanocellulose on a 500 L capacity locally fabricated reactor. A yield of 46.7% white gel material with 2.23% solid content was obtained from an overnight reaction. Transmission electron microscopy scan of the white gel material confirms the production of relatively short highly individualized cellulose nanofibril (CNF) as the diameter of abaca fiber was reduced from 16.28 mu m to 3.12 nm with fiber length in the range of 100 nm to 200 nm. Nanocellulose film was prepared using air drying (CNF-VC) and vacuum oven drying (CNF-OD). The effect of CNF concentration on the physical, morphological, thermal and mechanical properties were evaluated. FTIR spectra showed cellulose I spectra between abaca fiber with both the CNF-VC film and CNF-OD film with two distinct peaks at 1620 cm(-1) and 1720 cm(-1) attributed to the carboxyl group resulting from the TEMPO oxidation. In addition, the carboxyl group decreases in thermal stability of cellulose. Moreover, the XRD scan showed a decrease in crystallinity index of CNF films compared to abaca fibers. CNF-VC film showed the highest tensile strength at 0.4% concentration with 88.30 MPa, while a 89.72 MPa was observed for CNF-OD film at 0.8% concentration.

    DOI: 10.3390/cryst12050601

    Web of Science

    Scopus

  19. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: cellulose I to cellulose II, tracing the structural changes under chemical treatment Reviewed

    Wang Han, Kataoka Hiroki, Tsuchikawa Satoru, Inagaki Tetsuya

    CELLULOSE   Vol. 29 ( 6 ) page: 3143 - 3151   2022.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Terahertz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose crystallography research, as THz radiation detects most intermolecular vibrations and responds to the phonons of crystalline lattices. In this study, we traced the transformation of the cellulose crystalline lattice from cellulose I to cellulose II by THz-TDS and X-ray powder diffraction. Cellulose II was obtained by treating cellulose I with NaOH of different concentrations (0 wt%-20 wt%, at 2 wt% intervals). The THz absorption coefficient spectra of cellulose II showed three characteristic peaks (at 1.32 THz, 1.76 THz, and 2.77 THz). The THz absorption coefficient spectra of cellulose II treated with 20-wt% NaOH and cellulose I without NaOH treatment were fitted by a seventh-order Fourier series. Thus, the THz absorption coefficient spectra of samples treated with NaOH of other concentrations could be considered a combination of these two fitted profiles of cellulose I and cellulose II, multiplied by different coefficients. Furthermore, the coefficients could reflect the relative contents of cellulose I and cellulose II in the samples.

    DOI: 10.1007/s10570-022-04493-x

    Web of Science

    Scopus

  20. Application of near-infrared spectroscopy to agriculture and forestry. Reviewed

    Tsuchikawa S, Ma T, Inagaki T

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry   Vol. 38 ( 4 ) page: 635 - 642   2022.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGERNATURE  

    Depending on the uniformity of the quality attribute within agricultural products, there is often a need to develop non-destructive and efficient evaluation methods to assure their qualities. Near-infrared spectroscopy (NIRS) is a well-suited method to characterize organic compounds, particularly when coupled with multivariate analysis methods. This review article introduces scientific and technical reports using the NIRS to evaluate food, agriculture, and forest products. Overall, basic spectroscopic research is continuously progressing; indeed, in combination with big-data information technology and spectral imaging techniques, material analysis is improving to maximize performance. Portable and low-cost devices have also been designed and produced, enabling remote analysis. Future advancements are expected to result in its applications in even more fields for online or at-line quality monitoring.

    DOI: 10.1007/s44211-022-00106-6

    Web of Science

    Scopus

    PubMed

  21. Rapid and nondestructive prediction of firmness, soluble solids content, and pH in kiwifruit using Vis–NIR spatially resolved spectroscopy Reviewed International coauthorship

    Ma T, Zhao J, Inagaki T, Su Y, Tsuchikawa S

    Postharvest Biology and Technology   Vol. 186   2022.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    This paper reports an evaluation of firmness, soluble solids content (SSC), and acidity (pH) in kiwifruit using a newly designed visible-near-infrared (Vis-NIR) spatially resolved spectroscopic (SRS) system. The system mainly comprises a cost-effective Vis-NIR hyperspectral imaging camera, a halogen light source, and 36 light-receiving silica fibers which were divided into six groups (1, 2, 3, 4, 5, and 10 mm away from the light illumination) used to collect diffusely reflected light from sample surface. During the experiment, time-resolved spectroscopy (TRS) was used to validate the light scattering characteristics at a single wavelength of 846 nm by transmission measurement, which differed from the reflectance measurement of the SRS system. The TRS results show that firmer kiwifruits tended to have a lower transmitted light intensity and a higher full width at half maximum value. The SRS results indicate that the reflected light intensity decreased more with an increased distance from the illumination spot in firmer kiwifruits. The results of the two methods supported the same view, i.e., firmer kiwifruit indicated higher degrees of light scattering inside. Following on, the calibration models for kiwifruit properties were constructed using the SRS data coupled with partial least squares regression analysis. Finally, the prediction accuracies were benchmarked against standard diffuse reflectance spectroscopy using one fiber group position of the same SRS system. The overall results showed the benefits of using the SRS system to predict fruit firmness by enhancing light scattering effects and predicting the SSC required for reducing such effects

    DOI: 10.1016/j.postharvbio.2022.111841

    Web of Science

    Scopus

  22. Moisture transport dynamics in wood during drying studied by long-wave near-infrared hyperspectral imaging Reviewed

    Ma Te, Morita Genki, Inagaki Tetsuya, Tsuchikawa Satoru

    CELLULOSE   Vol. 29 ( 1 ) page: 133 - 145   2022.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    The complexities of wood microstructure cause difficulties in understanding water movement characteristics during drying. Here, the water transport dynamics in softwood (Japanese cypress) with different sample lengths (30 mm, 60 mm, and 90 mm) and various drying temperatures (30 degrees C, 60 degrees C, and 90 degrees C) were studied using a rapid and high-resolution moisture content (MC) mapping method based on long-wave near-infrared hyperspectral imaging (NIR-HSI). The observations of this study are as follows: slow drying at approximately 30 degrees C, the area near the subsurface of the wood samples tends to have higher MC than the central parts during drying, especially in the case of longer wood samples. For drying at higher temperatures, strongly bonded water appeared at the surface areas much earlier, which could easily cause sample deformation and cracking. Overall, the experimental results suggest the capillary effects could play a major role at the first stage of slow drying at fiber level; then, the transfers between bound and free water could play a significant power source in the second drying stage. It is expected that this study will be of help in providing a basis to study and simulate the drying characteristics of cellular and hydrophilic materials.

    DOI: 10.1007/s10570-021-04290-y

    Web of Science

    Scopus

  23. Near-infrared spectroscopy and hyperspectral imaging can aid in the prediction and mapping of polyploid acacia hybrid wood properties in tree improvement programs Reviewed

    Dang Duc Viet, Ma Te, Inagaki Tetsuya, Nguyen Tu Kim, Tsuchikawa Satoru

    HOLZFORSCHUNG   Vol. 75 ( 12 ) page: 1067 - 1080   2021.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    Acacia, including Acacia hybrids, are some of the most important species grown as part of the Viet-namese wood industry. Rapid methods to identify the variations in the wood properties of Acacia hybrids how -ever, are a currently lacking and creating limits for their breeding programs. In this study, nine Acacia hybrid clones, including those that were diploid, triploid, and tetraploid were evaluated using near-infrared spectros-copy (NIR) and hyperspectral imaging (HSI). The standard normal variate (SNV) and second derivative (SP2D) were applied to compare the performances of NIR and HSI using partial least square regression. The HSI images were ac-quired at wavelengths from 1033 to 2230 nm and the SNV and SP2D described the variations in the wood properties. The NIR predicted the wood physical properties better than HSI, while they provided similar predictions for the mechanical properties. The mapping results showed low densities around the pith area and high densities near the bark. They also revealed that the air-dry moisture content changed at different positions within a disk and was dependent on its position within the tree. Overall, NIR and HSI were found to be potential wood property prediction tools, suitable for use in tree improvement programs.

    DOI: 10.1515/hf-2021-0024

    Web of Science

    Scopus

  24. Measuring the tensile strain of wood by visible and near-infrared spatially resolved spectroscopy Reviewed

    Te Ma, Tetsuya Inagaki, Masato Yoshida, Mayumi Ichino, Satoru Tsuchikawa

    Cellulose   Vol. 28 ( 17 ) page: 10787 - 10801   2021.11

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Strain measurement is critical for wood quality evaluation. Using conventional strain gauges constantly is high cost, also challenging to measure precious wood materials due to the use of strong adhesive. This study demonstrates the correlation between the light scattering degrees inside the wood during tension testing and their macroscopic strain values. A multifiber-based visible-near-infrared (Vis-NIR) spatially resolved spectroscopy (SRS) system was designed to rapidly and conveniently acquire such light scattering changes. For the preliminary experiment, samples with different thicknesses, from 2 to 5 mm, were measured to evaluate the influence of sample thickness. The differences in Vis-NIR SRS spectral data diminished with an increase in sample thickness, suggesting that the SRS method can successfully measure the wood samples' whole strain (i.e., surface and inside). Then, for the primary experiment, 18 wood samples were each prepared with approximately the same sample thickness of 2 mm and 5 mm to construct strain calibration models, respectively. The prediction accuracy of the 2-mm samples was characterized by a determination coefficient (R-2) of 0.81 with a root mean squared error (RMSE) of 343.54 mu epsilon for leave-one-out cross-validation; for test validation, the validation accuracy was characterized by an R-2 of 0.76 and an RMSE of 395.35 mu epsilon. For the validation accuracy of the 5-mm samples, R-val(2) was 0.69 with 440.78 mu epsilon RMSEval. Overall, the presented calibration results of the SRS approach were confirmed to be superior to the standard diffuse reflectance spectroscopy.

    DOI: 10.1007/s10570-021-04239-1

    Web of Science

    Scopus

    Other Link: https://link.springer.com/article/10.1007/s10570-021-04239-1/fulltext.html

  25. Parameter Optimization of Vibrating and Comb-Brushing Harvesting of Lycium barbarum L. Based on FEM and RSM Reviewed

    Jian Zhao, Te Ma, Tetsuya Inagaki, Yun Chen, Guangrui Hu, Zhiwei Wang, Qingyu Chen, Zening Gao, Jianguo Zhou, Miaohai Wang, Satoru Tsuchikawa, Jun Chen

    Horticulturae   Vol. 7 ( 9 ) page: 286 - 286   2021.9

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The current mechanical harvesting methods of Lycium barbarum L. are labor intensive and cause too much damage, but vibrating and comb-brushing harvesting can increase the efficiency while minimizing the damage. However, optimizing the main factors and their parameter values of vibrating and comb-brushing harvesting is challenging. To achieve the high-efficiency and low-damage harvesting of L. barbarum, firstly, the mechanical models of the materials used in the experiments were established based on the physical tests. Then, the vibrating and comb-brushing harvesting simulations were conducted based on FEM to acquire the ranges of the parameter values. The effects of the rotating speed, material, and amplitude on the harvesting rate of ripe fruit and harvesting rate of unripe fruit, as well as the damage rate of ripe fruit were determined based on RSM. Finally, the optimized parameters were obtained and verified using the field experiments. The field experiments showed that the harvesting rate of ripe fruit was 85.8%, the harvesting rate of unripe fruit was 10.5%, and the damage rate of ripe fruit was 9.7%. The findings provided the optimal parameter values, which were a design basis for the vibrating and comb-brushing harvesters of L. barbarum.

    DOI: 10.3390/horticulturae7090286

    Web of Science

    Scopus

  26. Using near-infrared spectroscopy to determine moisture content, gel strength, and viscosity of gelatin Reviewed International coauthorship

    Simon Duthen, Cecile Levasseur-Garcia, Didier Kleiber, Frédéric Violleau, Carlos Vaca-Garcia, Satoru Tsuchikawa, Christine Delgado Raynaud, Jean Daydé

    Food Hydrocolloids   Vol. 115   page: 106627 - 106627   2021.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.foodhyd.2021.106627

    Web of Science

    Scopus

  27. Finite Element Method Simulations and Experiments of Detachments of Lycium barbarum L. Reviewed

    Jian Zhao, Te Ma, Tetsuya Inagaki, Qingyu Chen, Zening Gao, Lijuan Sun, Haoxuan Cai, Chao Chen, Chuanlin Li, Shixia Zhang, Satoru Tsuchikawa, Jun Chen

    Forests   Vol. 12 ( 6 ) page: 699 - 699   2021.6

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    When harvesting Lycium barbarum L., excess amounts of detachments of the half-ripe fruit, unripe fruit, flowers, and leaves significantly affect the yield and adversely affect the subsequent processing, such as drying and grading. Finite element method (FEM) simulations and experiments of detachments were performed to harvest more ripe fruit and less half-ripe fruit, unripe fruit, flowers, and leaves. Three-dimensional (3D) models of the ripe fruit, half-ripe fruit, unripe fruit, flowers, leaves, fruit calyxes (flower calyx), fruit stems (flower stem), and branches were constructed using a 3D scanner, and material mechanics models of the above parts were established based on physical tests with universal testing machines. Detachment simulations and experiments of the ripe fruit, half-ripe fruit, unripe fruit, flowers, and leaves were performed to determine the detachment mechanisms and sequences. The detachment forces of each set of two parts were obtained. The field experiments showed that the detachment force between the fruit and calyx of ripe fruit was the lowest value of these forces, and only the ripe fruit was the first to detach from the calyx when harvesting. The results provided data support on the mechanics properties of wood and the optimization basis for the harvesting method of L. barbarum.

    DOI: 10.3390/f12060699

    Web of Science

    Scopus

  28. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: the potentiality of being a new standard for evaluating crystallinity Reviewed

    Han Wang, Satoru Tsuchikawa, Tetsuya Inagaki

    Cellulose   Vol. 28 ( 9 ) page: 5293 - 5304   2021.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Given that terahertz (THz) radiation responds to intermolecular forces such as hydrogen bonds, THz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose research. In this study, THz-TDS was used to investigate the crystallinity of three types of cellulose-based materials. Microcrystalline cellulose (MCC) and wood were ball milled at different times, and pseudo-wood was a mixture of MCC and lignin of different mass fractions. All the samples showed peaks at 3.04 THz in the THz mass absorption coefficient spectra. Further, the spectra from 2.79 THz to 3.32 THz were cut out and detrended by subtraction from a baseline. The integrated intensity of the detrended spectra showed a correlation with the mass fraction of lignin of the pseudo-wood samples, and ball milling time of the MCC and wood samples. The correlation was similar with the crystallinity index calculated from X-ray powder diffraction. Moreover, the original wood sample without ball milling had an integrated intensity that was about 30% that of the original MCC sample, matching with the cellulose concentration of the wood (about 30% to 40%). We normalized the integrated intensity of 2.79 THz to 3.32 THz into 1 to 0 by a min-max algorithm and proposed a new "index" for evaluating crystallinity.

    DOI: 10.1007/s10570-021-03902-x

    Web of Science

    Scopus

    Other Link: https://link.springer.com/article/10.1007/s10570-021-03902-x/fulltext.html

  29. Modal Analysis and Experiment of a Lycium barbarum L. Shrub for Efficient Vibration Harvesting of Fruit Reviewed

    Jian Zhao, Satoru Tsuchikawa, Te Ma, Guangrui Hu, Yun Chen, Zhiwei Wang, Qingyu Chen, Zening Gao, Jun Chen

    Agriculture   Vol. 11 ( 6 ) page: 519 - 519   2021.6

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The most common harvesting method of Lycium barbarum L. (L. barbarum) is manual harvesting, resulting in low efficiency and high cost. Meanwhile, the efficiency of vibration harvesting, which is considered an efficient mechanical harvesting method, can be significantly improved if the optimized resonance frequency of the shrub can be obtained. To vibration harvest fruit efficiently, a 3D model of the shrub was established based on measurements of the shape parameters, and material mechanics models of the branches were established based on physical tests. The modal analysis of the shrub based on finite element method (FEM) simulation was performed to obtain the range of resonance frequency, and the modal experiment of the shrub using acceleration sensors and an impact hammer was conducted to obtain the accurate resonance frequency. Based on the results of the modal analysis and experiment, the optimized resonance frequency was determined to be 2 Hz. The field experiment showed that the fruit fell off when the branches were vibrated at this frequency. The results provide the design basis for the efficient vibration harvesting of L. barbarum.

    DOI: 10.3390/agriculture11060519

    Web of Science

    Scopus

  30. Demonstration of the applicability of visible and near-infrared spatially resolved spectroscopy for rapid and nondestructive wood classification Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    Holzforschung   Vol. 75 ( 5 ) page: 419 - 427   2021.5

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    <title>Abstract</title>
    Although visible and near-infrared (Vis-NIR) spectroscopy can rapidly and nondestructively identify wood species, the conventional spectrometer approach relies on the aggregate light absorption due to the chemical composition of wood and light scattering originating from the physical structure of wood. Hence, much of the work in this area is still limited to further spectral pretreatments, such as baseline correction and standard normal variate to reduce the light scattering effects. However, it should be emphasized that the light scattering rather than absorption in wood is dominant, and this must be effectively utilized to achieve highly accurate and robust wood classification. Here a novel method based on spatially resolved diffuse reflectance (wavelength range: 600–1000 nm) was demonstrated to classify 15 kinds of wood. A portable Vis-NIR spectral measurement system was designed according to previous simulations and experimental results. To simplify spectral data analysis (i.e., against overfitting), support vector machine (SVM) model was constructed for wood sample classification using principal component analysis (PCA) scores. The classification accuracies of 98.6% for five-fold cross-validation and 91.2% for test set validation were achieved. This study offers enhanced classification accuracy and robustness over other conventional nondestructive approaches for such various kinds of wood and sheds light on utilizing visible and short-wave NIR light scattering for wood classification.

    DOI: 10.1515/hf-2020-0074

    Web of Science

    Scopus

    Other Link: https://www.degruyter.com/document/doi/10.1515/hf-2020-0074/xml

  31. Characteristics of self-excited alternate-tooth vibration of circular saw blade Reviewed

    Ken Takeyama, Hideyuki Yokochi, Satoru Nishio, Satoru Tsuchikawa

    BioResources   Vol. 16 ( 2 ) page: 3840 - 3850   2021.5

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:BioResources  

    In recent years, circular saw blades with thinner kerfs have been in high demand for improvement of the production yield of wood-based materials and the reduction of sawdust. In the case of ripping of solid wood, the number of teeth of a circular saw blade is normally set to 40 or 50, with a diameter of 305 mm, which allows less cutting resistance and smooth exhausting of sawdust. However, at certain rotational speeds, self-excited alternate-tooth vibration can easily occur in circular saw blades with such thin kerfs and so few teeth. Therefore, the cutting surface quality tends to be worse. In this study, the mechanism of this self-excited alternate-tooth vibration was clarified. The vibration mode and frequency were predicted by the finite element method. In addition, a circular saw blade with a body thickness 1.5 mm and 50 teeth was employed for wood-cutting experiments. The rotational speed range of the self-excited alternate-tooth vibration modes and their frequencies were investigated. When a double of the tooth passage frequency was slightly higher than the frequencies of the alternate-tooth vibration modes, an alternate-tooth vibration of the regenerative chatter type was excited, owing to the forces on the sides of the tooth.

    DOI: 10.15376/biores.16.2.3840-3850

    Web of Science

    Scopus

  32. Non-destructive and fast method of mapping the distribution of the soluble solids content and pH in kiwifruit using object rotation near-infrared hyperspectral imaging approach Reviewed International coauthorship

    Te Ma, Yu Xia, Tetsuya Inagaki, Satoru Tsuchikawa

    Postharvest Biology and Technology   Vol. 174   2021.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier B.V. This work aimed to offer a non-destructive and fast approach to visualizing the soluble solids content (SSC) and acidity (pH) of the whole kiwifruit. Most of the visible-near-infrared spectral imaging techniques used in postharvest fruit and vegetables assessment exhibit issues related to the identification of the quality spatial distribution within intact samples, mainly due to sampling surface curvature effects. Here, a push-broom-type NIR hyperspectral imaging camera and a sample rotation stage were combined to scan entire kiwifruit surfaces. Then, key wavelengths in the range of 1002–2300 nm were extracted for constructing SSC and pH calibration models by partial least squares regression analysis. The resulting SSC prediction accuracy was sufficiently high: the coefficient of determination (R2cv) and the root mean square error (RMSEcv) of cross-validation set were 0.74 and 0.7 %, respectively. For pH, the R2cv and RMSEcv were 0.64 and 0.14, respectively. Finally, the SSC and pH 360˚mapping results surpassed earlier works in this area that they showed a distinct spatial distribution within each intact sample. It was concluded that the proposed object rotation hyperspectral imaging approach is promising for the non-destructive prediction mapping of SSC and pH in kiwifruit or other cylindrical-shaped samples.

    DOI: 10.1016/j.postharvbio.2020.111440

    Web of Science

    Scopus

  33. Rapid and nondestructive evaluation of hygroscopic behavior changes of thermally modified softwood and hardwood samples using near-infrared hyperspectral imaging (NIR-HSI) Reviewed International coauthorship

    Te Ma, Laurence Schimleck, Tetsuya Inagaki, Satoru Tsuchikawa

    Holzforschung   Vol. 75 ( 4 ) page: 345 - 357   2021.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020 Walter de Gruyter GmbH, Berlin/Boston 2020. The objective of this work was to provide a rapid and nondestructive imaging method for evaluating the hygroscopic behavior of thermally modified lignocellulosic materials (softwood and hardwood). The difference in the hygroscopic behavior was explained by moisture content (MC) mapping results and molecular association characteristics of absorbed water (i.e. weakly, moderately, and strongly hydrogen-bonded water molecules) with wood at various relative humidities (RH). To achieve this goal, near-infrared (NIR) spectral images in the wavelength range 1816-2130 nm (covering the combination of stretching and deformation vibrations for OH) were used to visualize MC distributions over the surface of Japanese cedar and European beech samples which had been thermally treated at different temperatures. A curve fitting method was utilized to explore changes in water-wood structure characteristics based on shifts to longer wavelength in spectral signals caused by increasing MC. The curve fitting results support the recent nuclear magnetic resonance (NMR) studies that different bound water stabilities may pool in different compartments of the wood cell wall. Furthermore, water was firmly bound to wood at low RHs and H-bonds gained mobility as the number of absorbed molecules increased. It is concluded that NIR hyperspectral imaging also has the potential to be a complementary methodology for studying the transient changes of wood-water interactions before equilibrium.

    DOI: 10.1515/hf-2019-0298

    Web of Science

    Scopus

  34. Rapid and nondestructive evaluation of soluble solids content (SSC) and firmness in apple using Vis–NIR spatially resolved spectroscopy Reviewed

    Te Ma, Yu Xia, Tetsuya Inagaki, Satoru Tsuchikawa

    Postharvest Biology and Technology   Vol. 173   2021.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier B.V. Visible–near infrared (Vis–NIR) spectroscopy is a rapid and nondestructive method used to characterize organic compounds in postharvest fruit and vegetable assessment. However, developing robust calibration models is a challenge as conventional spectrometers collect only the cumulative effects of light absorption and scattering. In this study, a multifiber-based Vis–NIR spatially resolved spectra measurement system was designed for simultaneous evaluation of soluble solid content (SSC) and firmness in apple. Thirty silica fibers separated into five groups at 1, 2, 3, 4, and 5 mm away from the light illumination point and connected to a cost-effective Vis–NIR hyperspectral imaging camera were used to acquire spectral data with an improved signal-to-noise ratio (S/N) by a two-step signal averaging process (i.e., 30 camera pixels per fiber and six optical fibers per group). Reflectance ratio spectra were then calculated by dividing the diffusely reflected light intensity detected at distance d +△ by that detected at distance d to realize a light reference-free approach. Finally, the useful explanatory variables were selected by competitive adaptive reweighted sampling (CARS) to construct individual calibration models for various regions. The coefficients of determination (Rcal2) and the root mean square errors (RMSEcal) of the best-performing calibration models were approximately 0.97 and 0.20 % for SSC and 0.96 and 0.37 N for firmness, respectively. Furthermore, the predicted results were 0.92 and 0.35 % for SSC and 0.87 and 0.71 N for firmness. Our method offers low-cost and portable detection of SSC and firmness for postharvest fruit evaluation.

    DOI: 10.1016/j.postharvbio.2020.111417

    Scopus

  35. Rapid and nondestructive evaluation of soluble solids content (SSC) and firmness in apple using Vis-NIR spatially resolved spectroscopy Reviewed

    Ma, T; Xia, Y; Inagaki, T; Tsuchikawa, S

    POSTHARVEST BIOLOGY AND TECHNOLOGY   Vol. 173   2021.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/jpostharvbio.2020.111417

    Web of Science

  36. Photodegradation Properties of Earlywood and Latewood Spruce Timber Surfaces Reviewed International coauthorship

    Preklet E, Tolvaj L, Tsuchikawa S, Varga D

    Acta Silvatica et Lignaria Hungarica   Vol. 17 ( 1 ) page: 9 - 20   2021

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.37045/aslh-2021-0001

    Scopus

  37. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose Reviewed

    Wang Han, Horikawa Yoshiki, Tsuchikawa Satoru, Inagaki Tetsuya

    CELLULOSE   Vol. 27 ( 17 ) page: 9767 - 9777   2020.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10570-020-03508-9

    Web of Science

    Scopus

  38. Rapid and non-destructive seed viability prediction using near-infrared hyperspectral imaging coupled with a deep learning approach Reviewed

    Te Ma, Satoru Tsuchikawa, Tetsuya Inagaki

    Computers and Electronics in Agriculture   Vol. 177   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier B.V. Seeds are the basis of the agricultural food industry, greater insights into seed viability before sowing could improve storage management and field performance. In the present study, we aimed to address this issue by using highly cost-efficient near-infrared hyperspectral imaging (NIR-HSI) and a convolutional neural network (CNN) deep learning approach. An NIR-HSI camera was used because it can recognize both molecular vibration information (i.e. chemical component differences) and its spatial distribution in each seed sample; this camera is much more informative than a regular RGB digital camera. Using this technology, the emphasis of this study was firstly to provide a methodology for enhancing the interpretability of viable and non-viable seeds via principal component analysis (PCA) and support vector machine (SVM) viability classification analysis of NIR-HSI data. A CNN was then constructed to“cognize” the differences in viable and non-inviable seeds and classify them automatically. Experimental results indicate that the methodology produces a ~90% classification accuracy for both a five-fold cross-validation set and a test set of naturally aged Japanese mustard spinach seeds. Therefore, this study provides a new strategy for effective and practical seed viability prediction.

    DOI: 10.1016/j.compag.2020.105683

    Web of Science

    Scopus

  39. Physical and mechanical properties of fast growing polyploid acacia hybrids (A. auriculiformis x A. mangium) from Vietnam Reviewed International coauthorship

    Dang Duc Viet, Te Ma, Tetsuya Inagaki, Nguyen Tu Kim, Nghiem Quynh Chi, Satoru Tsuchikawa

    Forests   Vol. 11 ( 7 )   2020.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020 by the authors. Acacia plants are globally important resources in the wood industry, but particularly in Southeast Asian countries. In the present study, we compared the physical and mechanical properties of polyploid Acacia (3x and 4x) clones with those of diploid (2x) clones grown in Vietnam. We randomly selected 29 trees aged 3.8 years from different taxa for investigation. BV10 and BV16 clones represented the diploid controls; X101 and X102 were the triploid clones; and AA-4x, AM-4x, and AH-4x represented neo-tetraploid families of Acacia auriculiformis, Acacia mangium, and their hybrid clones. The following metrics were measured in each plant: stem height levels, basic density, air-dry equilibrium moisture content, modulus of rupture (MOR), modulus of elasticity (MOE), compression strength, and Young's modulus. We found that the equilibrium moisture content significantly differed among clones, and basic density varied from pith-to-bark and in an axial direction. In addition, the basic density of AA-4x was significantly higher than that of the control clones. Furthermore, the MOR of AM-4x was considerably lower than the control clones, whereas the MOE of X101 was significantly higher than the control values. The compression strength of AM-4x was significantly lower than that of the control clones, but AH-4x had a significantly higher Young's modulus. Our results suggest that polyploid Acacia hybrids have the potential to be alternative species for providing wood with improved properties to the forestry sector of Vietnam. Furthermore, the significant differences among the clones indicate that opportunities exist for selection and the improvement of wood quality via selective breeding for specific properties.

    DOI: 10.3390/f11070717

    Web of Science

    Scopus

  40. Rapidly visualizing the dynamic state of free, weakly, and strongly hydrogen-bonded water with lignocellulosic material during drying by near-infrared hyperspectral imaging Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    Cellulose   Vol. 27 ( 9 ) page: 4857 - 4869   2020.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2020, Springer Nature B.V. Real-time monitoring of the dynamic state of water molecular structure in lignocellulosic material is challenging, but important for both theoretical studies and industrial applications. In the present study, three typical wood samples which have a fundamental difference in the anatomical structure were scanned in the near-infrared spectral range, and images were acquired from wavelengths of 1002–1847 nm during drying. Then, partial least squares regression was used to determine the water content by mass, and principal component analysis was utilized to characterize the variance of NIR difference spectral data between 1340 and 1610 nm after baseline correlation for showing the distribution changing from free water to bound water during air drying. It was clarified that the PC1 loading mainly correlates with simple water content by mass, whereas the PC2 loading contains information about water–wood hydrogen structure interactions. The three loading curve peaks of PC2 could be correlated with free, weakly bound, and strongly bound water based on longer wavelength shifting. Finally, PC1 and PC2 scores were comprehensively applied to show the distribution changing from free water to bound water in each wood sample with a 62.5 μm/pixel high spatial resolution.

    DOI: 10.1007/s10570-020-03117-6

    Web of Science

    Scopus

  41. Simultaneous detection of density, moisture content and fiber direction of wood by THz time-domain spectroscopy Reviewed

    Kashima Moe, Tsuchikawa Satoru, Inagakr Tetsuya

    JOURNAL OF WOOD SCIENCE   Vol. 66 ( 1 )   2020.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s10086-020-01874-3

    Web of Science

    Scopus

  42. Cognitive spectroscopy for wood species identification: near infrared hyperspectral imaging combined with convolutional neural networks.

    Kanayama H, Ma T, Tsuchikawa S, Inagaki T

    The Analyst   Vol. 144 ( 21 ) page: 6438 - 6446   2019.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c9an01180c

    Scopus

    PubMed

  43. Analysis of wood thermal degradation using 2D correlation of near infrared and visible-light spectroscopy Reviewed

    Mahdiyanti Siti Hanifah, Inagaki Tetsuya, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 27 ( 5 ) page: 354 - 369   2019.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    Wood changes its properties, especially color, as a result of thermal degradation. In this study, change in wood properties due to thermal degradation have been studied using the nondestructive test methods of near infrared spectroscopy, CIELAB color measurement, visible-light spectroscopy, and Arrhenius time-temperature superposition. Arrhenius time-temperature superposition allowed analysis of near infrared and visible-light spectra, and color parameters to predict thermal degradation and color change of wood at 120-180celcius for 6 min to nine months duration. Two-dimensional correlation spectroscopy for the complementary analysis of near infrared and visible-light spectroscopy was applied to investigate chemical changes during wood thermal degradation that cause the observed color change. Visible-light spectroscopy with CIELAB color measurement was used to obtain information on color changes, and near infrared spectroscopy was applied in the measurement of chemical changes during thermal degradation. Changes in spectral intensities in 2D correlation spectroscopy indicated that different chemical components are responsible for color change during heat treatment and accelerated aging of wood. With dry-thermal treatment, the hemicellulose content decreased following a color change, whereas cellulose and lignin/extractives decreased with hygro-thermal treatment.

    DOI: 10.1177/0967033519863878

    Web of Science

    Scopus

  44. Three-dimensional grain angle measurement of softwood (Hinoki cypress) using near infrared spatially and spectrally resolved imaging (NIR-SSRI) Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    Holzforschung   Vol. 73 ( 9 ) page: 817 - 826   2019.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © 2019 Walter de Gruyter GmbH, Berlin/Boston. As the strength of wood is greatly affected by its three-dimensional (3D) grain angles (the dive angle and the surface angle), the wood industry today requires automatic, rapid, and robust measurement techniques for measuring them simultaneously. In the present study, a near infrared spatially and spectrally resolved imaging (NIR-SSRI) system was designed in a line scan model, mainly including an NIR hyperspectral imaging camera and a halogen spotlight source (Ø 1 mm). Spatially resolved diffuse reflectance images at three target wavelengths (1002 nm, 1217 nm, and 1413 nm) were obtained from Hinoki cypress [Chamaecyparis obtusa (Siebold & Zucc.) Endl.] samples at various (0°, 3°, 6°, ⋯ 45°) dive angles and surface angles (0°, 3°, 6°, ⋯ 45°). The scattering patterns caused by the "tracheid effect" were almost elliptical. Subsequently, nonlinear least squares fitting was used to determine their eccentricities (e) and rotation angles (θ). The e values at each selected wavelength were highly correlated with the dive angle reference values; and the global identification model developed using Gaussian process regression (GPR) under five-fold cross-validation (CV) reached a determination coefficient (r2) of 0.98 with a root mean square error (RMSE) of 2.2°. On the other hand, local surface angle identification models developed using linear regression analysis achieved determination coefficients higher than 0.90 on r2 and an RMSE of CV lower than 3.8° when the dive angle was lower than 30°.

    DOI: 10.1515/hf-2018-0273

    Web of Science

    Scopus

    CiNii Research

  45. Determination of Dielectric Function of Water in THz Region in Wood Cell Wall Result in an Accurate Prediction of Moisture Content Reviewed

    Wang Han, Inagaki Tetsuya, Hartley Ian D, Tsuchikawa Satoru, Reid Matthew

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES   Vol. 40 ( 6 ) page: 673 - 687   2019.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    This report follows up previous work that presented a model for the simultaneous detection of moisture content and density of wood using Terahertz time-domain spectroscopy. A significant improvement in the prediction accuracy of the model is demonstrated by including a moisture content-dependent dielectric function for the water within the wood samples. Justification for using the dielectric function is presented, the prediction accuracy is quantified, and the results compared with prior work.

    DOI: 10.1007/s10762-019-00594-0

    Web of Science

    Scopus

  46. A new approach based on a combination of capacitance and near-infrared spectroscopy for estimating the moisture content of timber Reviewed

    Vu Thi Hong Tham, Inagaki Tetsuya, Tsuchikawa Satoru

    WOOD SCIENCE AND TECHNOLOGY   Vol. 53 ( 3 ) page: 579 - 599   2019.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    The moisture content (MC) of wood influences its material properties. Determination of MC is essential in both the research and manufacturing fields. This study examined a nondestructive method for estimating MC rapidly and effectively. A capacitance sensor and a near-infrared (NIR) spectrometer were used to measure the MC of Japanese cedar and Japanese cypress timber. High-frequency capacitance (20MHz) and NIR spectral absorption (908-1676nm) data were collected for cross section and tangential section, as well as for the whole-sample average, in two MC ranges: from the green to the fiber saturation point (FSP) and from FSP to air-dried state. The results indicated that when standard error of prediction (SEP) is compared, the performance in [FSP to air-dried state] was better; when coefficient of determination in cross-validation (Rval2) and residual predictive deviation in cross-validation (RPDval) were compared, the performance in [Green to FSP] was better. Statistical analysis was performed using multiple linear regression and partial least squares. Combining capacitance and NIR absorbance at two wavelengths (Capacitance+NIR-MLR calibration) from the green to FSP was the best calibration yielding the most promising results: Rval2=0.96, SEP=5.20% and RPDval=4.97 on the cross section of samples. The results were higher than those of other calibrations in R-2 and SEP and RPD values. The NIR-PLS calibration performed better than others with quite good R-2, lower SEP and higher RPD in the MC range from FSP to air-dried state. The first calibration using only capacitance of wood was good in the first range of MC, but it is not good in the second range (R-2 under 0.5). Depending on the MC range, the performance of each calibration was different. In both MC ranges, the results on the cross section were higher than on the tangential section due to the anisotropic characteristics of wood material. From Capacitance+NIR-MLR calibration, the predicted models were developed using multiple linear regression and logarithmic regression. Results suggest the possibility of developing a new portable device combining a capacitance sensor and NIR spectroscopy to accurately predict the MC of wood.

    DOI: 10.1007/s00226-019-01077-0

    Web of Science

    Scopus

  47. Rapid identification of wood species by near infrared spatially-resolved spectroscopy (NIR-SRS) based on hyperspectral imaging (HSI) Reviewed

    Ma, T.; Inagaki, T.; Ban, M.; Tsuchikawa, S.

    Holzforschung   Vol. 73 ( 4 ) page: 323 - 330   2019.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2018-0128

    Scopus

  48. Near infrared estimation of concentration of ginsenosides in Asian ginseng Reviewed

    Inagaki Tetsuya, Katayama Norihisa, Cho Rae-Kwang, Chen Xijun, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 27 ( 2 ) page: 115 - 122   2019.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    In this study, the feasibility of near infrared reflectance spectroscopy for the quality evaluation of the main bioactive compounds, ginsenosides, in Panax ginseng was examined. Second derivative NIR spectra of standard reagents of ginsenoside Rg(1), Re, Rb-1, Rc, Rb-2 and Rd were used for analysis. Characteristic bands were observed at around 5250 cm(-1) in the spectra of ginsenoside Rg(1) group (including Rg(1) and Re); however, this was not to be observed on the spectra of ginsenoside Rb-1 group (including Rb-1, Rc, Rb-2 and Rd). PLS regression models were constructed of air-dry ginseng powder samples and ginsenoside content in ginsengs was determined by HPLC methods. The calibration models covered various types of ginseng (white ginseng, red ginseng and bleached ginseng) from various cultivated areas (Japan, China and Korea) and were well established for each kind of ginsenoside. It was shown that NIR spectroscopy can be used for the accurate prediction of ginsenoside.

    DOI: 10.1177/0967033518814851

    Web of Science

    Scopus

  49. Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI) Reviewed

    Imran Arra d. Sofianto, Tetsuya Inagaki, Te Ma, Satoru Tsuchikawa

    Holzforschung   Vol. 73 ( 3 ) page: 259 - 268   2019.3

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    © 2019 Walter de Gruyter GmbH, Berlin/Boston. Naturally occurring knots reduce the mechanical strength of wood. Veneers from sugi (Cryptomeria japonica) served as research material to study the effect of knots and holes. Veneer samples were first subjected to a three-point bending test to obtain measured modulus of elasticity (MOE) values. Then, near-infrared (NIR) hyperspectral imaging (HSI) was used to construct a prediction model and map the predicted MOE values. This is the first attempt for MOE prediction from the entire veneer surface based on NIR-HSI technology, while the mathematical part relies on chemometrics and cross-validation partial least squares regression (CV-PLSR). Maps of MOE prediction values could distinguish between latewood (LW) and earlywood (EW), as well as between a sound knot and a dead knot.

    DOI: 10.1515/hf-2018-0060

    Web of Science

    Scopus

  50. DETERMINATION OF CAROTENOIDS AND DOBI CONTENT IN CRUDE PALM OIL BY SPECTROSCOPY TECHNIQUES: COMPARISON OF RAMAN AND FT-NIR SPECTROSCOPY Reviewed

    Nokkaew Rayakorn, Punsuvon Vittaya, Inagaki Tetsuya, Tsuchikawa Satoru

    INTERNATIONAL JOURNAL OF GEOMATE   Vol. 16 ( 55 ) page: 92 - 98   2019.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:GEOMATE INT SOC  

    Crude palm oil (CPO) is a rich source of carotenoids which are a precursor of vitamin A as an important antioxidant. Carotenoids and Deterioration Of Bleachability Index (DOBI) are important factors to indicated quality of CPO. The conventional method for DOBI and carotenoids determination use UV-Vis spectrophotometry and HPLC, respectively which methods use solvents and spend time for analysis. This research interests Raman and FT-NIR spectroscopy for carotenoids and DOBI determination due to those techniques are an alternative technique for rapid measurement, non-destruction of material, and environmental suitability. The results indicated that Raman is better for determination than FT-NIR spectrometry. In Raman analysis, multiplicative scatter correction (MSC) and standard normal variate (SNV) treated methods were the best models for carotenoids and DOBI, respectively. The bands of carotenoids were at 1,100 and 1,500 cm(-1) wavenumber. Validation on carotenoids produced 0.94 of correlation coefficient (R), 0.88 of coefficient of determination (R-2), 40.65 ppm of root mean square error of prediction (RMSEP) and 3.25 of the ratio of standard error of prediction to standard deviation (RPD). The validation of DOBI produced 0.76 of R, 0.57 of R-2, 0.31 of RMSEP, 1.92 of RPD of 1.92. The limitation of carotenoids and DOBI determination using FT-NIR is having sufficient concentration of carotenoids for analysis. In addition, data for various samples regarding location, season, and oil palm species are important to build models for precise prediction.

    DOI: 10.21660/2019.55.4813

    Web of Science

    Scopus

  51. Non-destructive evaluation of wood stiffness and fiber coarseness, derived from SilviScan data, via near infrared hyperspectral imaging Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    Journal of Near Infrared Spectroscopy   Vol. 26 ( 6 ) page: 398 - 405   2018.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    © The Author(s) 2018. Near infrared hyperspectral imaging combined with partial least squares regression analysis was used to evaluate wood stiffness (modulus of elasticity) and fiber coarseness. Five samples with normal wood and compression wood collected from two Japanese Cedar (Cryptomeria japonica) trees were analyzed. To achieve high reliability of the prediction values, a SilviScan system (X-ray densitometry, X-ray diffractometry, and optical microscopy) with the high spatial resolution was used for measuring reference data. The measurement interval for modulus of elasticity and fiber coarseness was 1µm and 25 µmm, respectively. After spectral pre-treatment and key wavelengths selection, partial least squares analysis was applied to calibrate near infrared data to reference values. The determination coefficient (RCV2) of modulus of elasticity was 0.66 with a root mean square error of cross validation (RMSECV) of 1.80 GPa. For the constructed fiber coarseness calibration model, RCV2 and RMSECV were 0.62 and 35.02 µmm/g, respectively. Finally, modulus of elasticity and fiber coarseness mapping results show detailed information (156 µmm/pixel) at the grown ring level. The differences among earlywood, latewood, and compression wood were all well identifiable.

    DOI: 10.1177/0967033518808053

    Web of Science

    Scopus

  52. NIR estimation of concentration of ginsenosides in Asian ginseng Reviewed

    Inagaki, T.; Katayama, N.; Cho, R.; Chen, X.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy     2018.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1177/0967033518814851

  53. Inspection of Microfibril Angle of Sugi Wood by THz-TDS Reviewed

    Wang H, Tsuchikawa S, Inagaki T

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   Vol. 2018-September   2018.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    Wood as a biological material has large differences in individual properties, and terahertz time-domain spectroscopy (THz-TDS) provide a new possibility for the wood products industry since THz exhibits high transparency to wood with big birefringence and diattenuation. By using the complex refractive index and absorption coefficient, THz is excepted to estimate important properties such as fiber orientation, microfibril angle (MFA) etc. simultaneously. In this study, sugi was used as sample because of its simple structure. Density and moisture content were predicted by using the real part of complex refractive index combined with absorption coefficient and showed a high correlation between measured and predicted values, prediction of MFA is still an ongoing mission.

    DOI: 10.1109/IRMMW-THz.2018.8510303

    Scopus

  54. Quality Evaluation of Engineered Wood by THz-TDS Reviewed

    Kashima M, Tsuchikawa S, Inagaki T

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   Vol. 2018-September   2018.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    This study attempts simultaneous prediction of grain angle, density and moisture content by THz time domain spectroscopy (THz-TDS) which has sufficient spatial resolution and transparency for wood. Terahertz waves transmitted through wood contain information on moisture content, density, grain angle and crystallinity of the sample. In this study, we measured spectra of 14 kinds of wood (5 soft wood, 9 hard woods) at various moisture contents and air-dried douglas fir while rotating the sample against the polarization of the terahertz wave. It was shown that the fiber orientation, density and moisture content of wood can be predicted simultaneously from the calculated complex permittivity.

    DOI: 10.1109/IRMMW-THz.2018.8510155

    Scopus

  55. Optical characteristics of Douglas fir at various densities, grain directions and thicknesses investigated by near-infrared spatially resolved spectroscopy (NIR-SRS) Reviewed

    Te Ma, Gary Schajer, Tetsuya Inagaki, Zarin Pirouz, Satoru Tsuchikawa

    Holzforschung   Vol. 72 ( 9 ) page: 789 - 796   2018.9

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    A near-infrared spatially resolved spectroscopy (NIR-SRS) system, also called the hyperspectral imaging system, was applied in a line scanning model combined with a concentrated halogen light source (Ø 1 mm), and spatially resolved reflectance images of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] wood were obtained. The samples with various densities, grain directions and thicknesses were observed in the NIR range of 1000-1600 nm. Then, a nonlinear curve-fitting algorithm was applied based on the steady-state diffusion theory model to estimate the absorption coefficient (μa), and reduced scattering coefficients ( μ′s ${\\mu '-s}$ ) both parallel and perpendicular to the grain direction at each measurement position. The absorption scattering coefficients at 1457 nm and two kinds of reduced scattering coefficients at 1002 nm were highly correlated with wood densities measured by an X-ray densitometer. The correlation coefficients were 0.953 and 0.987 for 3 mm and 5 mm samples, respectively, while three optical profiles were combined. It can be concluded that NIR-SRS is a fast and simple method for measuring the optical characteristics of softwood, although it has a non-homogeneous cellular structure. Sub-surface density and grain direction could be predicted with satisfactory accuracy based on a few key wavelengths without relying on multivariate statistical analysis.

    DOI: 10.1515/hf-2017-0213

    Web of Science

    Scopus

    CiNii Research

  56. Determination of physical and chemical properties and degradation of archeological Japanese cypress wood from the Tohyamago area using near-infrared spectroscopy Reviewed

    Tetsuya Inagaki, Hitoshi Yonenobu, Yuuki Asanuma, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 64 ( 4 ) page: 347 - 355   2018.8

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Tokyo  

    Here, we evaluated the application of near-infrared (NIR) spectroscopy for estimating the degradation level of archeological wood samples from the Tohyamago area, the dendrochronological ages of which were also determined. The wood samples were radially cut from three logs obtained from the Tohyamago area. NIR reflectance spectra were measured from the tangential faces of air- and oven-dried wood samples using a Fourier transform NIR spectrophotometer. The second derivative spectra within the wavenumber range of 6400–5200 cm−1, in which the effect of moisture content in wood is suspected to be insignificant, showed a characteristic behavior with age. By comparing the second derivative spectral change in our wood samples with that in wood degraded by aging, thermal treatment, fungal attack, and lightning reported in the literature, we found that the second derivative spectra of wood samples from one log was similar to those of wood degraded by hygro-thermal treatment, whereas those of wood samples from another log was similar to those of wood degraded by brown-rot fungi. The physical and chemical properties of archeological wood were well predicted using a combination of partial least square regression analysis and NIR spectroscopy.

    DOI: 10.1007/s10086-018-1718-8

    Web of Science

    Scopus

  57. Noncontact evaluation of soluble solids content in apples by near-infrared hyperspectral imaging Reviewed

    Te Ma, Xinze Li, Tetsuya Inagaki, Haoyu Yang, Satoru Tsuchikawa

    Journal of Food Engineering   Vol. 224   page: 53 - 61   2018.5

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Ltd  

    Near-infrared (NIR) hyperspectral imaging was used to evaluate soluble solids content (SSC) in ‘Fuji’ apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. Eighty ‘Fuji’ apples were analyzed by collecting four small block samples from each one (approximately 2.0 cm × 2.0 cm × 1.5 cm). Partial least squares (PLS) regression analysis was performed to determine the relation between SSC reference data and NIR spectral data measured from each sample. The cross-validation coefficient of determination (r2) between predicted and measured SSC values is 0.89 with a root mean squared error of cross-validation (RMSECV) of 0.55%. Then, we successfully mapped SSC at a high spatial resolution (375 μm per pixel). In addition, the absorption and reduced scattering coefficients of the measured samples were determined based on a diffusion theory model. The absorption coefficients are positively correlated to the SSC values (chemical information), whereas water cored tissue content (physical information) causes a characteristic change in light scattering coefficients. The fitting results were validated by Monte Carlo simulation, and the light penetration depth in ‘Fuji’ apples was estimated to be around 0.33 cm at 1198 nm and 0.17 cm at 1450 nm, respectively.

    DOI: 10.1016/j.jfoodeng.2017.12.028

    Web of Science

    Scopus

  58. Effect of cellular structure on the optical properties of wood Reviewed

    Mayuka Ban, Tetsuya Inagaki, Te Ma, Satoru Tsuchikawa

    Journal of Near Infrared Spectroscopy   Vol. 26 ( 1 ) page: 53 - 60   2018.2

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications Ltd  

    To construct robust calibrations of wood properties by near infrared spectroscopy, one must independently evaluate the spectral contributions of light absorption and light scattering. However, the light propagation in wooden cellular structures is difficult to interpret because these structures are complex, heterogeneous, and anisotropic. This study investigates the reduced scattering coefficients of softwood and hardwood (with ring-porous or diffuse-porous vessels) at 846 nm by time-resolved spectroscopy. It also evaluates the effect of wooden cellular structure and air-dry density on the light propagation. After determining the reduced scattering coefficients, we observed cross-sectional microscopic images of the wood samples. Eighty-five percent of the variation in the reduced scattering coefficients was explainable by the air-dry density, area ratio of the cell wall, and the median pore area. Monte Carlo simulations of the light propagation through wood revealed that most of the photon transport occurs in the cell-wall substance.

    DOI: 10.1177/0967033518757233

    Web of Science

    Scopus

    CiNii Research

  59. Selective assessment of duplex heat-treated wood by near-infrared spectroscopy with principal component and kinetic analyses Reviewed

    Tetsuya Inagaki, Yuuki Asanuma, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 64 ( 1 ) page: 6 - 15   2018.2

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Tokyo  

    We selectively assessed the thermal and hygrothermal treatment times of duplex heat-treated samples from the softwood hinoki cypress (Chamaecyparis obtusa) and the hardwood Japanese zelkova (Zelkova serrata) using near-infrared (NIR) spectroscopy with principal component analysis (PCA) and spectral-kinetic analysis. Wood samples from each species were thermally or hygrothermally treated at 120, 130, 150, and 180 °C, and the second-derivative spectra of these samples in the 6300–5450 cm−1 range, where moisture content has the smallest effect, were then subjected to PCA. The master curve that was calculated by kinetic analysis successfully explained changes in the first principal component (PC1) scores with thermal treatment time for all temperatures. The angles between the PC1 loadings that explained the spectral variation due to thermal and hygrothermal treatment were 79° for hinoki and 80° for zelkova. Thus, calculation of the inner product between the second-derivative spectra of duplex heat-treated wood and a loading vector that explained the spectral variation due to thermal or hygrothermal treatment allowed us to selectively assess the thermal and hygrothermal treatment times.

    DOI: 10.1007/s10086-017-1670-z

    Web of Science

    Scopus

  60. A novel combined application of capacitive method and near-infrared spectroscopy for predicting the density and moisture content of solid wood Reviewed

    Vu Thi Hong Tham, Tetsuya Inagaki, Satoru Tsuchikawa

    Wood Science and Technology   Vol. 52 ( 1 ) page: 115 - 129   2018.1

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Verlag  

    The use of a capacitive method and near-infrared (NIR) spectroscopy to simultaneously predict the density and moisture content (MC) of wood samples was investigated. Prediction accuracy of both methods was individually investigated by multivariate analyses. The capacity and absorbance at two wavelengths in the NIR range were combined to predict both the properties by the specific models. All wavelength combinations in the range of 908–1676 nm were tested, and the best combination yielding the highest coefficient of determination (R2) was chosen. This novel method showed a strong correlation between predicted and measured data, independent of sample thickness and wood species. The prediction accuracy of the wood samples, from green wood to oven-dried conditions, showed promising results for all thicknesses, with R2 = 0.79, root-mean-square error of cross-validation (RMSECV) = 0.10 g/cm3, and residual predictive deviation (RPD) = 2.22 for density and R2 = 0.80, RMSECV = 25.70%, and RPD = 2.22 for MC. In the case of below fiber saturation point to oven-dried state, R2 value was slightly decreased in the prediction of MC and slightly increased in the prediction of density, but RMSECV of MC declined significantly (maximum 5.46%) compared to the range of MC from saturated point (maximum 39.56%). These results were considerably better than those obtained by modeling the capacitive or NIR method individually, and improvement was particularly apparent in estimating density. The results suggest the possibility of a new device combining the capacitive method and NIR spectroscopy to predict density and MC more accurately.

    DOI: 10.1007/s00226-017-0974-x

    Web of Science

    Scopus

  61. Quality Evaluation of Engineered Wood by THz-TDS Reviewed

    Kashima Moe, Tsuchikawa Satoru, Inagaki Tetsuya

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  62. Non-destructive evaluation of wood stiffness and fiber coarseness, derived from SilviScan data, via near infrared hyperspectral imaging Reviewed

    Ma, T.; Inagaki, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 26 ( 6 ) page: 398-405   2018

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  63. Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI) Reviewed

    114. Sofianto, I. A.; Inagaki, T.; Ma, T.; Tsuchikawa, S.

    Holzforschung     2018

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1515/hf-2018-0060

  64. Near-infrared hyperspectral imaging for classification of mung bean seeds Reviewed

    Kaewkarn Phuangsombut, Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa, Anupun Terdwongworakul

    International Journal of Food Properties   Vol. 21 ( 1 ) page: 799 - 807   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    ©2018 Kaewkarn Phuangsombut, Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa and Anupun Terdwongworakul. Hard mung bean seeds pose a problem in the sprouting process as they develop mold and infect neighboring seeds. Near-infrared hyperspectral imaging combined with partial least squares discriminant analysis was applied to develop a classifying model to separate hard mung beans from normal ones. The orientation of the measured beans was found to affect the classification result. The optimal partial least squares discriminant analysis model based on all orientations resulted in a correlation coefficient (R) of 0.919 with a root mean squared error of prediction of 0.197. The non-germinative parts were mapped and were concentrated at one end of the bean. Finally, a germinability index was proposed according to the proportion of colored areas between the germinative and non-germinative parts from the hyperspectral imaging results.

    DOI: 10.1080/10942912.2018.1476378

    Web of Science

    Scopus

  65. Inspection of Microfibril Angle of Sugi Wood by THz-TDS Reviewed

    Wang H., Tsuchikawa S., Inagaki T.

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  66. Inspection of Microfibril Angle of Sugi Wood by THz-TDS Reviewed

    Wang H, Tsuchikawa S, Inagaki T

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  67. Quality Evaluation of Engineered Wood by THz-TDS Reviewed

    Kashima Moe, Tsuchikawa Satoru, Inagaki Tetsuya

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  68. Dynamic behavior of wood chemical components under drying process measured by near infrared spectroscopy Reviewed

    Shiho Sugii, Takaaki Fujimoto, Harusa Tsutsumi, Tetsuya Inagaki, Satoru Tsuchikawa

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400 - 406   2017.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications Ltd  

    This study examined the dynamic behavior of wood chemical components during the drying process using near infrared spectroscopy. Principal component analysis and generalized two-dimensional correlation spectroscopy were applied to identify significant absorption bands from the heavily overlapping near infrared spectra. The near infrared spectra were successively acquired over the moisture content range of 60-11%. The principal component analysis scores indicated that the wood-water interaction in the moisture content range of 60-46% significantly differed from that in the range of 45-11%. The synchronous 2D correlation spectrum constructed from the spectra in the moisture content range of 60-46% revealed that the cell wall components and water molecules responded to the drying process even though the wood exceeded the fiber saturation point. In the moisture content range of 45-11%, the H-bonded OH groups in the crystalline region of cellulose clearly increased with the decrease in bound water. Moreover, the sequential order of events was also clarified from the asynchronous spectrum.

    DOI: 10.1177/0967033517733379

    Web of Science

    Scopus

  69. High-Resolution and Non-destructive Evaluation of the Spatial Distribution of Nitrate and Its Dynamics in Spinach (Spinacia oleracea L.) Leaves by Near-Infrared Hyperspectral Imaging Reviewed

    Yang, H.; Inagaki, T.; Ma, T.; Tsuchikawa, S.

    frontiers in Plant Science   Vol. 8   page: 10.3389/fpls.2017.01937   2017.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/fpls.2017.01937

    Scopus

  70. Temperature dependence of wood photodegradation monitored by infrared spectroscopy Reviewed

    Denes Varga, Laszlo Tolvaj, Satoru Tsuchikawa, Laszlo Bejo, Edina Preklet

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   Vol. 348   page: 219 - 225   2017.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    The temperature dependence of the photodegradation of hardwoods (beech, Fagus sylvatical. and poplar, Populus x euramericana cv. Pannonia) and softwoods (Scots pine, Pinus sylvestris L and spruce, Picea abies Karst.) was investigated. Samples were irradiated by a strong UV emitter mercury lamp at 30 degrees C, 80 degrees C, 120 degrees C and 160 degrees C. A series of samples was treated in the same chamber set to 30 degrees C, 80 degrees C, 120 degrees C and 160 C but without light irradiation (pure thermal treatment). The chemical changes were detected by infrared spectroscopy. The same light irradiation generated much greater absorption change at 160 degrees C than at 30 degrees C. The simultaneous thermal and UV treatment generated much greater absorption increase in the whole investigated infrared region than the sum of absorption increases generated by the individual thermal treatment and UV radiation, separately. Softwoods were more sensitive to the light irradiation at elevated temperatures than hardwoods. Results revealed that four bands around 1770, 1750, 1720 and 1690 cm(-1) emerged in the unconjugated carbonyl region as a result of the UV irradiation at elevated temperatures. The intensity change of these bands is highly dependent on the wood species. Absorption increase was found at 1066 and 1035 cm(-1). (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotochem.2017.08.040

    Web of Science

    Scopus

  71. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system Reviewed

    Sofianto, I. A.; Inagaki, T.; Kato, K.; Itoh, M.; Tsuchikawa, S.

    International Wood Products Journal   Vol. 8 ( 4 )   2017.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1080/20426445.2017.1378398

  72. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system Reviewed

    Sofianto Imran Arra'd, Inagaki Tetsuya, Kato Kouchi, Itoh Mariya, Tsuchikawa Satoru

    INTERNATIONAL WOOD PRODUCTS JOURNAL   Vol. 8 ( 4 ) page: 193 - 200   2017.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/20426445.2017.1378398

    Web of Science

    Scopus

  73. Stiffness and Moisture Content Prediction Model of Wooden Veneer Using Fast Online Near-Infrared (NIR) Spectroscopic System Reviewed

    Sofianto, I. A, Inagaki, T, Itoh, M, Tsuchikawa, S

    Forestry Research and Engineering: International Journal   Vol. 1 ( 2 ) page: 1-5   2017.9

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  74. Stiffness and Moisture Content Prediction Model of Wooden Veneer Using Fast Online Near-Infrared (NIR) Spectroscopic System Reviewed

    Sofianto, I. A.; Inagaki, T.; Itoh, M.; Tsuchikawa, S.

    Forestry Research and Engineering: International Journal   Vol. 1 ( 2 ) page: 1-5   2017.9

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  75. High spatial resolution and non-destructive evaluation of wood density and microfibril angle by NIR hyperspectral imaging

    Ma, T.; Inagaki, T.; Tsuchikawa, S.

      Vol. 28 ( 5 ) page: 7-12   2017.6

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  76. High spatial resolution and non-destructive evaluation of wood density and microfibril angle by NIR hyperspectral imaging Invited Reviewed

    Ma, T, Inagaki, T, Tsuchikawa, S

      Vol. 28 ( 5 ) page: 7-12   2017.6

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  77. Segregating wood wastes by repetitive principal component analysis of near infrared spectra Reviewed

    Hikaru Kobori, Sakura Higa, Satoru Tsuchikawa, Yoichi Kojima, Shigehiko Suzuki

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 25 ( 3 ) page: 180 - 187   2017.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    To improve the recycling rate of wooden materials, it is necessary to classify wood waste by disposal method and usage. In the industrial manufacture of these materials, rapid and accurate determination of their chemical and physical properties is critical for a stable supply of wood products with reliable quality. In this study, we investigated a discriminant analysis process for waste wood products using hyperspectral imaging with a newly developed repetitive principal component analysis. Hyperspectral images of four types of wood waste (plywood coated with resin, preservative-treated wood, hardwood and softwood) were acquired. The mean spectrum of each sample was extracted from a hypercube in order to build a classification model. A novel classification method based on principal component analysis, named repetitive principal component analysis, was developed. A total of three repetitions of principal component analysis were performed to classify the four types of wood waste. Cross-validated results of repetitive principal component analysis resulted in classifications greater than 85% for any of the four wood waste types. The discriminant model was then applied to single-pixel spectra of the hypercube to form a prediction map. Hyperspectral imaging, with the aid of the new repetitive principal component analysis discriminant analysis, is a powerful tool in wood recycling processes.

    DOI: 10.1177/0967033517714344

    Web of Science

    Scopus

  78. Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 71 ( 4 ) page: 341 - 347   2017.4

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    Wood density and microfibril angle (MFA) are strongly correlated with wood stiffness, swelling/shrinkage, and its anisotropy. Understanding the spatial distribution of these data is critical for solid timber applications. In this study, near-infrared (NIR) hyperspectral imaging has been calibrated for evaluation of wood density and MFA in an effective manner. Briefly, five wood samples collected from both normal wood (NW) and compression wood (CW) moieties of two different Cryptomeria japonica trees were analyzed. Partial least squares (PLS) regression analysis was performed to determine the relationship between X-ray densitometry data obtained by SilviScan and NIR spectra, and cross-validation (leave-one-out) approach served for prediction performances. The validation coefficient of determination (r(2)) between the predicted densities by the NIR technique and the X-ray data was 0.83 with a root mean squared error of cross-validation (RMSECV) of 105.2 kg m(-3). Regarding MFA, the r(2) was 0.77 and RMSECV 5.36 degrees. Wood density was successfully maped as well as the MFA at a high spatial resolution. As a result, the detection of annual growth ring features and evaluation of aspects of heterogeneous wood quality has been facilitated. The mapping results were visually checked by looking at the difference between earlywood (EW) and latewood (LW) for density and by means of the Maule color reaction indicating high lignin contents in CW in terms of MFA validation as CWs have high MFA values.

    DOI: 10.1515/hf-2016-0153

    Web of Science

    Scopus

  79. Temperature dependence of wood photodegradation monitored by infrared spectroscopy

    Varga, D, Tolvaj, L, Tsuchikawa, S, Bejoc, L, Prekleta, E

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 348   page: 219-225   2017

  80. Dynamic behavior of wood chemical components under drying process measured by near-infrared spectroscopy Reviewed

    Sugii, S.; Fujimoto, T.; Tsutsumi, H.; Inagaki, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400-406   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  81. Temperature dependence of wood photodegradation monitored by infrared spectroscopy Reviewed

    Varga, D., Tolvaj, L.; Tsuchikawa, S.; Bejoc, L.; Prekleta, E.

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 348   page: 219-225   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  82. Segregating wood wastes by repetitive principal component analysis of near infrared spectra Reviewed

    Kobori, H.; Higa, S.; Tsuchikawa, S., Kojima, Y.; Suzuki, S.

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 3 ) page: 180-187   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  83. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution Reviewed

    Inagaki, T.; Watanabe, T.; Tsuchikawa S.

    PLOS ONE     page: https://doi.org/10.1371/journal.pone.0176920   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1371/journal.pone.0176920

  84. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging Reviewed

    Phuangsombut, K.; Terdwongworakul, A.; Suttiwijitpukdee, N.; Phuangsombut A.; Tsuchikawa S.; Inagaki T.; Ma T.

    Thai Society of Agricultural Engineering Journal   Vol. 23 ( 1 ) page: 23-29   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  85. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution Reviewed

    Inagaki Tetsuya, Watanabe Tomoko, Tsuchikawa Satoru

    PLOS ONE   Vol. 12 ( 5 ) page: e0176920   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1371/journal.pone.0176920

    Web of Science

    Scopus

    PubMed

  86. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging Reviewed

    Phuangsombut, K, Terdwongworakul, A, Suttiwijitpukdee, N, Phuangsombut A, Tsuchikawa S, Inagaki T, Ma T

    Thai Society of Agricultural Engineering Journal   Vol. 23 ( 1 ) page: 23-29   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  87. Dynamic behavior of wood chemical components under drying process measured by near-infrared spectroscopy

    Sugii, S, Fujimoto, T, Tsutsumi, H, Inagaki, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400-406   2017

  88. Development of Multiple Evaluation Method of Wood Pulp in Paper by Near Infrared Spectroscopy

    Kawabe Chika, Fukasawa Hiroyuki, Inagaki Tetsuya, Tsuchikawa Satoru

    JAPAN TAPPI JOURNAL   Vol. 71 ( 3 ) page: 326 - 334   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY  

    <p>Near infrared spectroscopy (NIRS) has been applied in some fields such as medicines, chemicals and ag ricultural products. In this report, NIRS was applied to paper sheets to analyze the contained pulp qualita tively and quantitatively. LBKP, NBKP, CTMP and others could be classified by principal component analysis (PCA) for NIR spectra. The blend ratio of LBKP, NBKP and CTMP in the both mixtures of LBKP and CTMP, and NBKP and CTMP could be determined respectively by partial least squares regression (PLSR)for NIR spectra within the coefficient of determination (R<sup>2 </sup> value) of 0.98. Furthermore, the ratio of mixture of KP and another pulp on the paper could be determined somewhat correctly even if we do not know what kinds of pulp were contained. NIRS could also be used to estimate the drainability of LBKP; that is, the pre dicted value was very close to the measured value. NIRS was also applied to evaluate the degree of degrada tion of pulp. PCA for NIR spectra of LBKP has revealed the linear relationships between recycled times and score.</p><p>The NIR technique is faster than staining techniques, and does not require special training. If we could have tested a wider variety of samples, if we had more time, and if we could have optimized the analysis con dition, it would be possible to estimate more precisely.</p>

    DOI: 10.2524/jtappij.71.326

    CiNii Research

  89. Segregating wood wastes by repetitive principal component analysis of near infrared spectra

    Kobori, H, Higa, S, Tsuchikawa, S, Kojima, Y, Suzuki, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 3 ) page: 180-187   2017

  90. Development of Multiple Evaluation Method of Wood Pulp in Paper by Near Infrared Spectroscopy

    JAPAN TAPPI JOURNAL   Vol. 71 ( 3 ) page: 318 - 325   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY  

    DOI: 10.2524/jtappij.1603

    CiNii Research

  91. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T., Kashima M., Tsuchikawa S.

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

    Scopus

  92. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  93. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  94. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  95. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  96. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  97. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  98. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  99. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T, Kashima M, Tsuchikawa S

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

  100. Coming full circle: back to basics in the application of near infrared spectroscopy to the forest and wood products sector

    Roger Meder, Satoru Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 6 ) page: V - VII   2016.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    DOI: 10.1255/jnirs.1256

    Web of Science

    Scopus

  101. Determination of optical parameters and moisture content of wood with visible-near infrared spectroscopy Reviewed

    Ataollah Haddadi, Guillaume Hans, Brigitte Leblon, Zarin Pirouz, Satoru Tsuchikawa, Joseph Nader, Kevin Groves

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 6 ) page: 571 - 585   2016.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    We used the Kubelka-Munk theory equations for calculating the absorption coefficient [K-lambda], the scattering coefficient [S-lambda], the transport absorption [sigma(lambda a)], the reduced scattering coefficient [sigma(lambda s)(1 -g)] and the penetration depth [delta(lambda)] from visible-near infrared reflectance spectra acquired over thin samples of quaking aspen and black spruce conditioned at three different moisture levels. The computed absorption and scattering coefficients varied from 0.1 mm(-1) to 4.0 mm(-1) and from 5.5 mm(-1) to 10.0 mm(-1), respectively. The absorption coefficients varied according to the absorption band, but the scattering coefficients decreased slowly towards high wavelengths. The sample moisture content was then estimated using the partial least squares (PLS) regression method from the K-lambda and/ or S-lambda spectra, and the resulting PLS models were compared to those obtained with raw and transformed [multiplicative scatter corrected (MSC), first and second derivative] absorption spectra. The best PLS models for black spruce, quaking aspen and both species were obtained when only the 800-1800 nm range was used with the raw or MSC spectra. They led to a root mean square error of cross validation (RMSECV) of 1.40%, 1.09% and 1.23%, respectively, and to a coefficient of determination (R-CV(2)) higher than 0.94. We also found that the K-lambda spectra between 800 nm and 1800 nm can provide PLS models having an acceptable accuracy for moisture content estimation (R-CV(2) = 0.83 and RMSECV = 2.32%), regardless of the species.

    DOI: 10.1255/jnirs.1174

    Web of Science

    Scopus

  102. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy Reviewed

    Konagaya Keiji, Inagaki Tetsuya, Kitamura Ryunosuke, Tsuchikawa Satoru

    OPTICS EXPRESS   Vol. 24 ( 9 ) page: 9561 - 9573   2016.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Optics Express  

    We measured the optical properties of drying wood with the moisture contents ranging from 10% to 200%. By using time-resolved near-infrared spectroscopy, the reduced scattering coefficient μs′ and absorption coefficient μa were determined independent of each other, providing information on the chemical and structural changes, respectively, of wood on the nanometer scale. Scattering from dry pores dominated, which allowed us to determine the drying process of large pores during the period of constant drying rate, and the drying process of smaller pores during the period of decreasing drying rate. The surface layer and interior of the wood exhibit different moisture states, which affect the scattering properties of the wood.

    DOI: 10.1364/OE.24.009561

    Web of Science

    Scopus

    PubMed

  103. NIR spectral-kinetic analysis for thermally degraded Sugi (<i>Cryptomeria japonica</i>) wood Reviewed

    Inagaki, T; Matsuo, M; Tsuchikawa, S

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 122 ( 3 )   2016.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Physics A: Materials Science and Processing  

    Kinetic analysis was conducted on principal component scores calculated from second-derivative near-infrared (NIR) spectra of thermally treated Sugi (Cryptomeria japonica) wood samples. NIR reflectance spectra were measured for wood samples thermally treated at 90, 120, 150 and 180 °C in an air-circulating oven for periods ranging from 5 min to approximately 1.4 years. The Arrhenius approach, which involves the time–temperature superposition method, is used to understand the change in the principal component score. The master curve corresponded well with the change in principal component scores at each temperature and yielded a determination coefficient between the measured and estimated data of 0.99 for second principal component score. This report shows that kinetic analysis is useful to understand changes in the principal component score calculated from NIR spectra of wood subjected to thermal treatment.

    DOI: 10.1007/s00339-016-9763-x

    Web of Science

    Scopus

  104. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy Reviewed

    Kitamura Ryunosuke, Inagaki Tetsuya, Tsuchikawa Satoru

    OPTICS EXPRESS   Vol. 24 ( 4 ) page: 3999 - 4009   2016.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Optics Express  

    The true absorption coefficient (μa) and reduced scattering coefficient (μ′s) of the cell wall substance in Douglas fir were determined using time-of-flight near infrared spectroscopy. Samples were saturated with hexane, toluene or quinolone to minimize the multiple reflections of light on the boundary between pore-cell wall substance in wood. μ′s exhibited its minimum value when the wood was saturated with toluene because the refractive index of toluene is close to that of the wood cell wall substance. The optical parameters of the wood cell wall substance calculated were μa = 0.030 mm-1 and μ′s = 18.4 mm-1. Monte Carlo simulations using these values were in good agreement with the measured time-resolved transmittance profiles.

    DOI: 10.1364/OE.24.003999

    Web of Science

    Scopus

    PubMed

  105. NIR Spectral-kinetic analysis for thermally degraded Sugi (Cryptomeria japonica) wood Reviewed

    Inagaki T, Matsuo M, Tsuchikawa S

    Applied Physics A   Vol. 122   page: 208   2016.2

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  106. Three-fibre-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex Reviewed

    Inagaki Tetsuya, Nozawa Daisuke, Shimomura Yoshiaki, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 4 ) page: 327 - 335   2016

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    It is shown that three-fibre-based diffuse reflectance spectroscopy, based on spatially resolved near infrared spectroscopy in the wavelength range 850-1060 nm, is a promising method for the measurement of quality in natural rubber latex samples. Absorbance ratios were defined as the ratio of light intensity detected at distances r and r + D from the emitter fibre. A relative absorbance ratio g was then calculated using the absorbance ratios at three wavelengths. Parameter g had a strong linear correlation with total solid content in latex (range 0.3-0.6 g g-1) with a coefficient of determination value of 0.98 and root mean square error for total solid content of 0.014 g g-1. Although the near infrared spectra measured by conventional transmission or reflectance spectroscopy were highly affected by the scattering coefficient in the sample, simulation results in this study showed that the effects of scattering in the samples on g can be reduced.

    DOI: 10.1255/jnirs.1227

    Web of Science

    Scopus

  107. Three fiber-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex

    Inagaki, T, Nozawa, D, Shimomura, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 327-335   2016

  108. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy Reviewed

    Kitamura, R.; Inagaki, T.; Tsuchikawa, S.

    Optic Express   Vol. 24 ( 4 ) page: 3999-4009   2016

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  109. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy Reviewed

    Konagaya, K.; Inagaki, T.; Kitamura, R.; Tsuchikawa, S.

    Optic Express   Vol. 24 ( 9 ) page: 9561-9573   2016

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  110. Nondestructive inspection of insects in chocolate using near infrared multispectral imaging Reviewed

    Ma, T.; Kobori, H.; Katayama, N.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 391-397   2016

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  111. Three fiber-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex Reviewed

    Inagaki, T.; Nozawa, D.; Shimomura, Y.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 327-335   2016

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  112. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発 Reviewed

    河部千香、深沢博之、稲垣 哲也、土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318-325   2016

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  113. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy

    Kitamura, R, Inagaki, T, Tsuchikawa, S

    Optic Express   Vol. 24 ( 4 ) page: 3999-4009   2016

  114. Non-destructive inspection of insects in chocolate using near infrared multispectral imaging Reviewed

    Te Ma, Hikaru Kobori, Norihisa Katayama, Satoru Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 4 ) page: 391 - 397   2016

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    Foreign matters in food products strongly affect the commercial viability of food production companies. To monitor and improve the reliability of food production processes, fast and non-destructive online inspection methods are urgently required. In this study, we exploited the high transmittance of near infrared (NIR) light, and designed an NIR transmission-type imaging device that detects low-density foreign matters (such as insects) inside chocolate. Insect parts had consistently lower transmittance than chocolate parts. To enhance the important differences between the two parts, the images were processed using principal component analysis. Furthermore, an algorithm for detecting the insect parts was developed in conjunction with image threshold processing and Laplacian of Gaussian edge detection. A favourable detection rate (93%) was achieved using spectral regions 840-870 nm, 870-900 nm and 900-930 nm. The results suggested that NIR multispectral imaging is useful for detecting low-density matter (insects) in the chocolate manufacturing industry.

    DOI: 10.1255/jnirs.1237

    Web of Science

    Scopus

  115. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy

    Konagaya, K, Inagaki, T, Kitamura, R, Tsuchikawa, S

    Optic Express   Vol. 24 ( 9 ) page: 9561-9573   2016

  116. Creation of Novel Science by Contacting Dissimilar Field: Introduction of Near Infrared Spectroscopy as Example

    TSUCHIKAWA Satoru

    TRENDS IN THE SCIENCES   Vol. 21 ( 2 ) page: 2_66 - 2_71   2016

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Science Support Foundation  

    DOI: 10.5363/tits.21.2_66

    CiNii Research

  117. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発 Reviewed

    河部千香, 深沢博之, 稲垣 哲也, 土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318-325   2016

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  118. Combined effects of UV light and elevated temperatures on wood discolouration Reviewed

    Tolvaj Laszlo, Tsuchikawa Satoru, Inagaki Tetsuya, Varga Denes

    WOOD SCIENCE AND TECHNOLOGY   Vol. 49 ( 6 ) page: 1225 - 1237   2015.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Wood Science and Technology  

    Two conifers and two deciduous wood species were irradiated by strong UV emitter mercury lamp at elevated temperatures up to 160 °C. Other series of samples were treated in the same chamber at the same temperatures but without light. Results showed that UV light irradiation produced much greater discolouration at elevated temperatures above 80 °C than at ambient temperature. The combined light irradiation and thermal treatment at 160 °C generated much larger discolouration than the sum of the discolouration data caused by UV light irradiation at 30 °C and by pure thermal treatment at 160 °C. The thermal effect during photodegradation was not only the simple addition of two effects, but the elevated temperature multiplied the effect of photodegradation. The greatest difference was shown by the redness change. The Arrhenius plots of all tree colour coordinates had a breaking point close to 100 °C, showing that above this temperature the chemical changes are more complex than below this value.

    DOI: 10.1007/s00226-015-0749-1

    Web of Science

    Scopus

  119. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis) Reviewed

    Inagaki T., Minagawa C., Yokochi H., Tsuchikawa S.

    2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015     page: 97 - 99   2015.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015  

    Demonstration of prediction of carbon and nitrogen content in Japanese Mustard Spinach (Brassica rapa var. perviridis) was accomplished using near infrared (NIR) reflectance spectroscopy. NIR reflectance spectroscopic measurement of hydroponically cultivated fresh leaves growing on stalks were taken at some growing phase. Calibrations were developed for carbon and nitrogen content in leaves using partial least square (PLS) regression method. Strong correlation between measured and predicted value for carbon and nitrogen were observed.

    DOI: 10.1109/SICE.2015.7285393

    Scopus

  120. A review of recent application of near infrared spectroscopy to wood science and technology Reviewed

    Tsuchikawa Satoru, Kobori Hikaru

    JOURNAL OF WOOD SCIENCE   Vol. 61 ( 3 ) page: 213 - 220   2015.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This review article introduces recent scientific and technical reports due to near infrared spectroscopy (NIRS) at wood science and technology, most of which was published between 2006 and 2013. Many researchers reported that NIR technique was useful to detect multi traits of chemical, physical, mechanical and anatomical properties of wood materials although it was widely used in a state where characteristic cellular structure was retained. However, we should be sensitive and careful for application of NIRS, when spectra coupled with chemometrics presents unexpected good results (especially, for mechanical physical and anatomical properties). The real application for on-line or at-line monitoring in wood industry is desired as next step. Basic spectroscopic research for wooden material is also progressed. It should be a powerful and meaningful analytical spectroscopic tool.

    DOI: 10.1007/s10086-015-1467-x

    Web of Science

    Scopus

  121. Visualisation of spatial distribution of moisture content and basic density using near-infrared hyperspectral imaging method in sugi (Cryptomeria japonica)

    T. Fujimoto, T. Numa, H. Kobori, S. Tsuchikawa

    International Wood Products Journal   Vol. 6 ( 2 ) page: 46 - 48   2015.5

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Maney Publishing  

    This study quantified the spatial distribution of moisture content and basic density within Cryptomeria japonica branches using near-infrared (NIR) hyperspectral imaging and multivariate data analysis techniques. The hyperspectral data for wood disk samples were acquired using a Compovision NIR Composition Imaging System (Sumitomo Electric Industries, Ltd., Yokohama, Japan) with a spectral range of 913-2519 nm. The calibration models for prediction of moisture content and basic density were developed using partial least squares (PLS) regression analysis. The PLS model for moisture content and basic density showed good predictive performance with coefficients of determination 0.82 (RMSEP512.4%) and 0.84 (RMSEP528.0 kg m&lt
    sup&gt
    -3&lt
    /sup&gt
    ) respectively. The spatial distribution of predicted moisture content clearly detected the low moisture white zone surrounding the heartwood. The high density compression wood could be also visualised with the NIR hyperspectral imaging technique. The results presented here provide useful information for development of a novel log sorting method.

    DOI: 10.1179/2042645314Y.0000000084

    Web of Science

    Scopus

  122. Fast online NIR technique to predict MOE and moisture content of sawn lumber Reviewed

    Hikaru Kobori, Tetsuya Inagaki, Takaaki Fujimoto, Tsutomu Okura, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 69 ( 3 ) page: 329 - 335   2015.4

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    A fast online grading apparatus for sawn lumber based on near-infrared (NIR) spectroscopy has been developed. The method is based on a novel wavelength dispersive NIR spectrophotometer equipped with a diffraction grating linear sensor and high-intensity lighting. It was possible to acquire spectra from the entire surface of Hinoki cypress lumber sections traveling on a conveyor belt at a speed of 120 m min(-1). Additionally, predictive models for moisture content (MC) and modulus of elasticity (MOE) under various MC conditions were developed from the NIR spectra with the aid of partial least squares regression (PLSR) analysis. Both the MC and MOE predictive models demonstrated sufficient levels of prediction accuracy for use on high-speed conveyor belts, and the results of various experiments indicate that the developed device could be applied for the online quality certification of sawn lumber in commercial sawmills.

    DOI: 10.1515/hf-2014-0021

    Web of Science

    Scopus

  123. Construction of a novel densitometer that utilizes a near-infrared laser system with Douglas fir (Pseudotsuga menziesii) Reviewed

    Ryunosuke Kitamura, Satoru Tsuchikawa

    Wood Material Science and Engineering   Vol. 10 ( 1 ) page: 69 - 74   2015.1

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Taylor and Francis Ltd.  

    A novel densitometer consisting of a continuous wave near-infrared (NIR) laser source and an avalanche photodiode module as the detector has been designed, which can rapidly and non-destructively measure the density of wood. The wood density of a small area (3.14 mm2) at the radial-transverse face was continuously estimated using the intensity of the transmitted light with the aid of the modified Lambert-Beer law. By conducting a validity evaluation with statistical coefficients, it was shown that the constructed system could obtain the sharp density profile compatible with X-ray densitometer [Root mean squared error of calibration (RMSEC) = 0.045 g cm−3, Root mean squared error of validation (RMSEV) = 0.046 g cm−3). It was concluded that the constructed NIR device has high performance from the viewpoint of operability, measuring time and safety.

    DOI: 10.1080/17480272.2014.968873

    Web of Science

    Scopus

  124. Assessment of variations in air-dry wood density using time-of-flight near-infrared spectroscopy Reviewed

    Guillaume Hans, Ryunosuke Kitamura, Tetsuya Inagaki, Brigitte Leblon, Satoru Tsuchikawa

    Wood Material Science and Engineering   Vol. 10 ( 1 ) page: 57 - 68   2015.1

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Taylor and Francis Ltd.  

    Abstract: Non-destructive measurement of wood density using reflectance and transmittance near-infrared spectroscopy (NIRS) has already been reported by several researchers. However, these methods do not allow an independent determination of the spectral contributions of the absorption and scattering effects. In this study, time-of-flight NIRS (TOF-NIRS) was used to measure wood density of seven softwood and hardwood species. A curve fitting procedure was used to resolve the diffusion equation and compute the absorption (µa) and reduced scattering coefficients ((Formula presented.)) from the time-resolved profiles (TRPs) acquired from the wood samples. Statistical parameters were also computed from TRPs and correlated with the wood air-dry density as well as with both optical coefficients. A simple linear regression model was built to relate air-dry wood density to µa (R2 = 0.56, root mean square error [RMSE] = 0.047 g/cm3, p value &lt
    0.05). Results obtained were in good agreement with the modified Beer–Lambert law for turbid media. The square root of the (Formula presented.) / (Formula presented.) ratio (which was well correlated with the photons mean path length) was used to correct for the distortion due to scattering in absorbance NIR spectra acquired using reflectance spectroscopy. This research demonstrates the potential of TOF-NIRS to assess wood density and to correct reflectance spectra for scattering effects.

    DOI: 10.1080/17480272.2014.923937

    Web of Science

    Scopus

  125. A Review of Recent Application of Near Infrared Spectroscopy to Wood Science and Technology Invited Reviewed

    Tsuchikawa, S.; Kobori, H.

    Journal of Wood Science   Vol. 61   page: 213-230   2015

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  126. Determination of optical parameters and moisture content of wood with visible-NIR spectroscopy Reviewed

    Haddadi, A; Hans, G.; Leblon, B.; Pirouz, Z.; Tsuchikawa, S.; Nader, J.; and Groves, K.

    Journal of Near Infrared Spectroscopy     2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: doi: 10.1255/jnirs.1174

  127. Combined effects of UV light and elevated temperatures on wood discolouration Reviewed

    Tolvaj, L.; Tsuchikawa, S.; Inagaki T.; Varga, D.

    Wood Science and Technology   Vol. 49 ( 6 ) page: 1225-1237   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  128. A Review of Recent Application of Near Infrared Spectroscopy to Wood Science and Technology

    Tsuchikawa, S, Kobori, H

    Journal of Wood Science   Vol. 61   page: 213-230   2015

  129. Combined effects of UV light and elevated temperatures on wood discolouration

    Tolvaj, L, Tsuchikawa, S, Inagaki T, Varga, D

    Wood Science and Technology   Vol. 49 ( 6 ) page: 1225-1237   2015

  130. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis) Reviewed

    Inagaki Tetsuya, Minagawa Chinatsu, Yokochi Hideyuki, Tsuchikawa Satoru

    2015 54TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE)     page: 97 - 99   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  131. Visualisation of degree of acetylation in beechwood by near infrared hyperspectral imaging Reviewed

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 23 ( 6 ) page: 353 - 360   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    Spatial distributions of the degree of acetylation in cross- and radial-sectional faces of beechwood samples under vapour-phase reaction are observed using near infrared hyperspectral imaging. The near infrared second derivative amplitude at 1727 nm, which is assigned to the first overtone of the CH stretching vibration averaged over the cross section and radial section, has strong linear correlation-with the substance concentration of acetyl groups (CA) held in the cell walls. Tangentially averaged CA is well explained by the modified rate equation. Both the rate constant and hindrance to the diffusion reagent reach constant values at a depth of about 4 mm from the edge of the wood, indicating that the acetylation reaction proceeds close to a depth of 4 mm.

    DOI: 10.1255/jnirs.1181

    Web of Science

    Scopus

    CiNii Research

  132. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis) Reviewed

    Tetsuya Inagaki, Chinatsu Minagawa, Hideyuki Yokochi, Satoru Tsuchikawa

    2015 54TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE)     page: 97 - 99   2015

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    Demonstration of prediction of carbon and nitrogen content in Japanese Mustard Spinach (Brassica rapa var. perviridis) was accomplished using near infrared (NIR) reflectance spectroscopy. NIR reflectance spectroscopic measurement of hydroponically cultivated fresh leaves growing on stalks were taken at some growing phase. Calibrations were developed for carbon and nitrogen content in leaves using partial least square (PLS) regression method. Strong correlation between measured and predicted value for carbon and nitrogen were observed.

    Web of Science

  133. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy

    Inagaki, T.; Ahmed, B.; Hartley, I. D.; Tsuchikawa, S.; Reid, M.

    Journal of Infrared, Millimeter, and Terahertz Waves   Vol. 35 ( 11 ) page: 949-961   2014.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  134. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy

    Inagaki, T, Ahmed, B, Hartley, I. D, Tsuchikawa, S, Reid, M

    Journal of Infrared, Millimeter, and Terahertz Waves   Vol. 35 ( 11 ) page: 949-961   2014.11

  135. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy Reviewed

    Inagaki Tetsuya, Ahmed Belal, Hartley Ian D., Tsuchikawa Satoru, Reid Matthew

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES   Vol. 35 ( 11 ) page: 949 - 961   2014.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Infrared, Millimeter, and Terahertz Waves  

    In this study, demonstration of simultaneous prediction of solid wood density and moisture content, both of which are critical in manufacturing operations, of 4 species (Aspen, Birch, Hemlock and Maple) was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for two orientations of the THz field (parallel and perpendicular) with respect to the visible grain. The real and imaginary parts of the dielectric function averaged over the frequency range of 0.1 to 0.2 THz had strong correlation with density and moisture content of the wood. We extend a model that has been applied previously to oven-dry wood to include the effects of moisture below the fiber saturation point by combining two effective medium models, which allows the dielectric function of water, air and oven-dry cell wall material to be modeled to give an effective dielectric function for the wood. A strong correlation between measured and predicted values for density and moisture content were observed.

    DOI: 10.1007/s10762-014-0095-7

    Web of Science

    Scopus

  136. Prediction of oven-dry density of wood by time-domain terahertz spectroscopy Reviewed

    Tetsuya Inagaki, Ian D. Hartley, Satoru Tsuchikawa, Matthew Reid

    HOLZFORSCHUNG   Vol. 68 ( 1 ) page: 61 - 68   2014.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    Wood is relatively transparent to terahertz (THz) radiation with wavelengths in the submillimeter range. This radiation has a high potential for sensing and imaging wood with a good spatial resolution. THz is especially sensitive to moisture content, fiber alignment, and density - all of which are critical in the manufacturing of wood products. In this work, a systematic study was undertaken on 46 very different wood species by means of THz time-domain spectroscopy with density determination in focus. The dielectric response of wood was modeled based on the Maxwell-Garnett effective medium theory. The dielectric function of the cell wall material was found to be extremely consistent over this large number of species with very different properties. This renders possible to determine wood density by THz time-domain spectroscopy. A strong correlation between the measured and predicted densities has been observed for all the samples investigated.

    DOI: 10.1515/hf-2013-0013

    Web of Science

    Scopus

  137. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging Reviewed

    Higa Sakura, Kobori Hikaru, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 67 ( 11 ) page: 1302 - 1307   2013.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    In this study, near-infrared hyperspectral imaging was applied to predict the water content of golden pothos (Epipremnum aureum) leaves, after which partial least squares regression (PLSR) analysis was performed to predict their averaged water content. The resulting predictive model was then applied to each single-pixel spectra in order to construct a water content image that could be used to evaluate the model's applicability to the single-pixel spectra through partial least squares score comparisons between the averaged spectra used for calibration and the single-pixel spectra. In the next phase, it was determined that a rebuilt PLSR predictive model based on the averaged spectra of an applicable pixel showed higher prediction accuracy than that of the original model. This study provides effective information about the limitations of prediction mapping and the optimization of pixel selections for better calibrations. © 2013 Society for Applied Spectroscopy.

    DOI: 10.1366/13-07028

    Web of Science

    Scopus

    PubMed

  138. A Review of Recent Near-Infrared Research for Wood and Paper (Part 2) Reviewed

    Tsuchikawa Satoru, Schwanninger Manfred

    APPLIED SPECTROSCOPY REVIEWS   Vol. 48 ( 7 ) page: 560 - 587   2013.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy Reviews  

    This review article introduces recent technical and scientific reports on near-infrared (NIR) spectroscopy in the wood and paper industry, which have increased during the last decade. Many researchers have reported that the NIR technique is useful for detection of both chemical and physical properties of wood materials and has been widely used in cases where the characteristic cellular structure of the material is retained. With regard to application of NIR spectroscopy to pulp and paper, many publications have reported its potential as an on-line measurement technique during paper-making process control. NIR spectroscopy is considered fundamental in applied research on wood and paper. Utilization of NIR spectroscopy in the wood and paper industry should take into account its applicability and limitations as a nondestructive technique. © 2013 Copyright Taylor and Francis Group, LLC.

    DOI: 10.1080/05704928.2011.621079

    Web of Science

    Scopus

  139. Prediction of dry veneer stiffness using near infrared spectra from transverse section of green log Reviewed

    Takaaki Fujimoto, Keisuke Kawakami, Haruhisa Aimi, Jun-ichi Shimizu, Koichi Hasegawa, Hikaru Kobori, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 59 ( 5 ) page: 383 - 388   2013.10

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    This study examined the feasibility of near infrared spectroscopy as a novel technique for log assessment on the basis of wood property. Near infrared (NIR) spectra were obtained from the transverse section of green log and multivariate regression analysis was carried out to predict the stiffness of veneer processed from the log. The stiffness of the veneer was dynamic modulus of elasticity measured using ultrasonic method. The calibrations of veneer stiffness had moderate relationships between measured and NIR-predicted values, with regression coefficients ranging from 0.84 to 0.88. The calibration equations were applied to the test set and it was found that predictions were also well fitted, with regression coefficients ranging from 0.67 to 0.89. The results indicate that the variation of wood stiffness within the logs could be assessed using the NIR spectra from the cross-section of logs. The spectra were obtained from green condition of the log and the stiffness of veneer was measured after kiln drying. Thus, the results imply that the wood stiffness in dry condition could be predicted using the spectra collected from green logs. If the models obtained in this study put into the imaging system, the two-dimensional map of the stiffness would be visualized on the cross-section of logs. The NIR spectroscopy coupled with imaging system could compensate the weak point of the traditional methods for log assessment. © 2013 The Japan Wood Research Society.

    DOI: 10.1007/s10086-013-1352-4

    Web of Science

    Scopus

  140. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon, B; Tsuchikawa, S

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  141. Near-infrared spectroscopy and the forest products industry Reviewed

    Leblon B., Tsuchikawa S.

    Forestry Chronicle   Vol. 89 ( 5 ) page: 575 - 576   2013.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Forestry Chronicle  

    DOI: 10.5558/tfc2013-103

    Scopus

  142. Near-Infrared Spectroscopy and the Forest Products Industry

    Brigitte Leblon, Satoru Tsuchikawa

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 575   2013.9

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CANADIAN INST FORESTRY  

    Web of Science

  143. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress Reviewed

    Kobori Hikaru, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 67 ( 6 ) page: 594 - 599   2013.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Chlorophyll fluorescence induction is widely applied to investigate plant growth conditions by calculating the ratio of its intensity at oxidized and reduced states. We examined the applicability of a time-resolved profile of chlorophyll fluorescence induction with the aid of multivariate analysis to monitor the leaf water stress. Principal component (PC) analysis of timeresolved images of chlorophyll fluorescence induction and their score images were reconstructed. Control leaves (non-stressed leaves) and water-stressed leaves could be classified by normalized PC3 score images. This technique has the potential to monitor the water stress condition of plants by using a simple device. © 2013 Society for Applied Spectroscopy.

    DOI: 10.1366/12-06850

    Web of Science

    Scopus

    PubMed

  144. Time-of-flight Near-infrared Spectroscopy for Nondestructive Measurement of Internal Quality in Grapefruit Reviewed

    Yohei Kurata, Tomoe Tsuchida, Satoru Tsuchikawa

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 138 ( 3 ) page: 225 - 228   2013.5

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER SOC HORTICULTURAL SCIENCE  

    We proposed a technique combining time-of-flight (TOF) and near-infrared spectroscopy (NIRS), termed TOF-NIRS, capable of measuring the time-resolved profiles of near-infrared (NIR) light with nanosecond resolution. Analysis of the variation in time-resolved profiles was used to estimate soluble solids concentration (SSC) and acidity in grapefruit (Citrus paradisi), and the prediction accuracy was compared with the conventional NIR measurement device. In data processing, the cross-correlation function, which evaluated the similarity between the reference and transmitted beams, was introduced as an explanatory variable for partial least squares regression. TOF-NIRS predicted both SSC and acidity in grapefruit with higher precision than the conventional NIR measurement with respective r values of 0.72 and 0.85. Specifically, the superiority of TOF-NIRS was attributed to measurement time and prediction accuracy in determining acidity.

    Web of Science

  145. Time-of-flight near-infrared spectroscopy for nondestructive measurement of internal quality in grapefruit Reviewed

    Kurata Y., Tsuchida T., Tsuchikawa S.

    Journal of the American Society for Horticultural Science   Vol. 138 ( 3 ) page: 225 - 228   2013.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    We proposed a technique combining time-of-flight (TOF) and near-infrared spectroscopy (NIRS), termed TOF-NIRS, capable of measuring the time-resolved profiles of near-infrared (NIR) light with nanosecond resolution. Analysis of the variation in time-resolved profiles was used to estimate soluble solids concentration (SSC) and acidity in grapefruit (Citrus paradisi)*and the prediction accuracy was compared with the conventional NIR measurement device. In data processing*the cross-correlation function*which evaluated the similarity between the reference and transmitted beams*was introduced as an explanatory variable for partial least squares regression. TOF-NIRS predicted both SSC and acidity in grapefruit with higher precision than the conventional NIR measurement with respective r values of 0.72 and 0.85. Specifically*the superiority of TOF-NIRS was attributed to measurement time and prediction accuracy in determining acidity.

    DOI: 10.21273/jashs.138.3.225

    Scopus

  146. Time-of-flight Near-infrared Spectroscopy for Nondestructive Measurement of Internal Quality in Grapefruit

    Kurata Yohei, Tsuchida Tomoe, Tsuchikawa Satoru

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 138 ( 3 ) page: 225 - 228   2013.5

     More details

  147. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC) Reviewed

    Hikaru Kobori, Nathalie Gorretta, Gilles Rabatel, Veronique Bellon-Maurel, Gilles Chaix, Jean-Michel Roger, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 67 ( 3 ) page: 307 - 314   2013.4

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER & CO  

    Visible-near-infrared hyperspectral imaging was tested for its suitability for monitoring the moisture content (MC) of wood samples during natural drying. Partial least-squares regression (PLSR) prediction of MC was performed on the basis of average reflectance spectra obtained from hyperspectral images. The validation showed high prediction accuracy. The results were compared concerning the PLSR prediction of MC mapping from raw spectra and standard normal variate (SNV) treatment. SNV pretreatment leads to the best results for visualizing the MC distribution in wood. Hyperspectral imaging has a high potential for monitoring the water distribution of wood.

    DOI: 10.1515/hf-2012-0054

    Web of Science

    Scopus

  148. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic methods Reviewed

    Inagaki Tetsuya, Sirisomboon Panmanas, Liu Chang, Thanapase Warunee, Tsuchikawa Satoru

    JOURNAL OF WOOD SCIENCE   Vol. 59 ( 2 ) page: 119 - 126   2013.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    The aim of this study was to investigate convenient spectroscopic evaluation method of Para rubber quality. Ultra violet-near infrared (UV-NIR 370-1085 nm) spectra of latex were measured in transmittance mode. Calibrations for total solid content (TSC) and dry rubber content (DRC) were developed using spectral data set with aid of partial least square regression analysis using 57 samples. UV-NIR spectra of latex provided good regression models between measured and predicted values of TSC and DRC with determination coefficient for cross-validation of 0. 96 and 0. 97, respectively. The ranks were 2 and 1, respectively. This study suggests high accuracy in-line quality control of latex using UV-NIR spectroscopy. The long wavelength NIR spectra of bark were scanned to check the feasibility of on-site evaluation of latex quality by measuring the NIR spectra of standing tree. From the observation of near infrared spectra, it was shown that there was more latex signal in outer part of wood bark than in inner part of wood bark. This result suggests that the focal point should be on the outer part of bark to get the signal of latex when we measure the spectra of standing tree. © 2012 The Japan Wood Research Society.

    DOI: 10.1007/s10086-012-1305-3

    Web of Science

    Scopus

  149. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic method Reviewed

    Inagaki, T.; Sirisomboon, P.; Liu, C.; Thanapase, W.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 59   page: 119-126   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  150. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC) Reviewed

    Kobori, H.; Gorretta, N.; Rabatel, G.; Bellon-Maurel, V.; Chaix, G.; Roger, J.-M.; Tsuchikawa, S.

    Holzforschung   Vol. 67 ( 3 ) page: 307-314   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  151. Establishment of near infrared archaeometry Invited Reviewed

    Inagaki, T.; Tsuchikawa, S.

    NIR News   Vol. 24 ( 7 ) page: 4-6   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  152. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging", Applied Spectroscopy Reviewed

    Higa, S.; Kobori, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 67 ( 11 ) page: 1302-1307   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  153. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood Reviewed

    Leblon, B.; Adedipe, O.; Hans, G.; Haddadi1, A.; Tsuchikawa, S.; Burger; J.; Stirling, R; Pirouz, Z.; Groves, K.; Nader, J.; LaRocque, A.

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 595-606   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  154. Vis-NIR Spectroscopy for the On-site Prediction of Wood Properties Reviewed

    Kobori, H.; Kojima, M.; Yamamoto, H.; Sasaki, Y.; Yamaji, F. M.; Tsuchikawa, S.

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 36-43   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  155. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress Reviewed

    Kobori, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 67 ( 6 ) page: 594-599   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  156. A Review of Recent Near Infrared Research for Wood and Paper Part 2 Invited Reviewed

    Tsuchikawa, S.; Schwanninger, S.

    Applied Spectroscopy Review   Vol. 48   page: 560-587   2013

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  157. Time of Flight Near Infrared Spectroscopy for Nondestructive Measurement of internal quality in Grapefruit Reviewed

    Kurata, Y.; Tsuchida, T.; Tsuchikawa, S.

    Journal of American Society of Horticultural Science   Vol. 138   page: 225-228   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  158. Prediction of wood density using near infrared-based partial least squares regression models calibrated with X-ray microdensity

    Rodrigues, J. C.; Fujimoto, T.; Schwanninger, M.; Tsuchikawa, S.

    NIR News   Vol. 24 ( 2 ) page: 4-5,8   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  159. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress

    Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 6 ) page: 594-599   2013

  160. Vis-NIR spectroscopy for the on-site prediction of wood properties Reviewed

    Kobori Hikaru, Kojima Miho, Yamamoto Hiroyuki, Sasaki Yasutoshi, Yamaji Fabio Minoru, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 631 - 638   2013

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Forestry Chronicle  

    We investigated the feasibility of visible-near-infrared (Vis-NIR) spectroscopy for estimation of wood qualities of fast-growing Eucalyptus grandis. Partial least squares regression (PLSR) models are applied to predict the diameter at the breast height (DBH), lateral growth rate (LGR) and propagation velocity of stress waves (PVSW). It was possible to estimate LGR and PVSW with appropriate accuracy. This suggested that perhaps information in terms of maturation is included in Vis-NIR spectra. The key factors in the validation of PVSW and LGR were the water and cellulose condition in wood.

    DOI: 10.5558/tfc2013-114

    Web of Science

    Scopus

  161. Vis-NIR Spectroscopy for the On-site Prediction of Wood Properties

    Kobori, H, Kojima, M, Yamamoto, H, Sasaki, Y, Yamaji, F. M, Tsuchikawa, S

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 36-43   2013

  162. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood

    Leblon, B, Adedipe, O, Hans, G, Haddadi1, A, Tsuchikawa, S, Burger; J, Stirling, R, Pirouz, Z, Groves, K, Nader, J, LaRocque, A

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 595-606   2013

  163. Establishment of near infrared archaeometry Invited Reviewed

    Inagaki, T, Tsuchikawa, S

    NIR News   Vol. 24 ( 7 ) page: 4-6   2013

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  164. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC)

    Kobori, H, Gorretta, N, Rabatel, G, Bellon-Maurel, V, Chaix, G, Roger, J.-M, Tsuchikawa, S

    Holzforschung   Vol. 67 ( 3 ) page: 307-314   2013

  165. A Review of Recent Near Infrared Research for Wood and Paper Part 2

    Tsuchikawa, S, Schwanninger, S

    Applied Spectroscopy Review   Vol. 48   page: 560-587   2013

  166. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood Reviewed

    Leblon Brigitte, Adedipe Oluwatosin, Hans Guillaume, Haddadi Ataollah, Tsuchikawa Satoru, Burger James, Stirling Rod, Pirouz Zarin, Groves Kevin, Nader Joseph, LaRocque Armand

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 595 - 606   2013

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Forestry Chronicle  

    This review article examines past and current research on the application of near-infrared (NIR) reflectance/transmittance spectroscopy (NIRS) for real-time monitoring of moisture content and density of solid wood Most of the applications of NIRS on solid wood have focussed on the application of multivariate statistics as exploratory tools for the prediction of physical, chemical and mechanical properties, such as moisture content, density, stiffness, cellulose and lignin content. However, very few studies on the development of optical models and the use of NIRS transmittance techniques on solid wood have been reported. NIRS technology has the potential to be used as a rapid tool that could be employed for at-line measurement and monitoring of wood properties in the forest products industry.

    DOI: 10.5558/tfc2013-111

    Web of Science

    Scopus

  167. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic method

    Inagaki, T, Sirisomboon, P, Liu, C, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 59   page: 119-126   2013

  168. Prediction of wood density using near infrared-based partial least squares regression models calibrated with X-ray microdensity Reviewed

    Rodrigues, J. C, Fujimoto, T, Schwanninger, M, Tsuchikawa, S

    NIR News   Vol. 24 ( 2 ) page: 4-5,8   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  169. Near-Infrared Spectroscopy and the Forest Products Industry Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 575   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  170. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging", Applied Spectroscopy

    Higa, S, Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 11 ) page: 1302-1307   2013

  171. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  172. Time-of-flight Near-infrared Spectroscopy for Nondestructive Measurement of Internal Quality in Grapefruit Reviewed

    土川 覚

      Vol. 138(3)   page: 1 - 4   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  173. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  174. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  175. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  176. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  177. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  178. La spectroscopie proche infrarouge et le secteur des produits forestiers Reviewed

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  179. Rapid Prediction of Past Climate Condition from Lake Sediments by Near-Infrared (NIR) Spectroscopy Reviewed

    Inagaki Tetsuya, Shinozuka Yoshitsugu, Yamada Kazuyoshi, Yonenobu Hitoshi, Hayashida Akira, Tsuchikawa Satoru, Yoshida Akihiro, Hoshino Yasuharu, Gotanda Katsuya, Yasuda Yoshinori

    APPLIED SPECTROSCOPY   Vol. 66 ( 6 ) page: 673 - 679   2012.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    This study explored the feasibility of rapid, nondestructive near-infrared (NIR) reflection spectroscopy for the prediction of conventional physical properties, carbon-nitrogen-sulfur (CNS) analysis, and concentration of inorganic components in sediment cores from a brackish lake. A long core sample, which consisted of well-preserved annually formed lamina from Lake Ogawara along the Pacific coast in Aomori Prefecture, northeastern Japan, was used to investigate the past environmental record. The core was previously analyzed for physical properties, CNS, and inorganic components. Calibration models were developed from NIR reflection spectra of 149 core samples. Partial least squares (PLS) analysis provided good regression models between measured and predicted values for water content, total nitrogen (TN), total organic carbon (TOC), total sulfur (TS), Al 2O 3, S/Al 2O 3, Fe 2O 3/Al 2O 3, Sc/Al 2O 3, Cu/Al 2O 3, and Zn/Al 2O 3 with coefficients of determination (r 2) for cross-validation of 0.73, 0.89, 0.88, 0.73, 0.92, 0.81, 0.82, 0.75, 0.82, and 0.82, respectively. The variation of predicted component values as a function of depth showed the same trend as that of conventionally measured values. This study also showed the possibility of NIR spectroscopy as an on-site, rapid analytical tool for the identification of tephra (fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism), which is important for dating. © 2012 Society for Applied Spectroscopy.

    DOI: 10.1366/11-06418

    Web of Science

    Scopus

    PubMed

  180. リグナ・ハノーバー2011名古屋大学ブース出展報告

    土川 覚

    木材工業 = Wood industry   Vol. 67 ( 2 ) page: 81 - 84   2012.2

     More details

    Publisher:日本木材加工技術協会  

  181. リグナ・ハノーバー2011名古屋大学ブース出展報告 Reviewed

    土川 覚

    木材工業 = Wood industry   Vol. 67 ( 2 ) page: 81 - 84   2012.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本木材加工技術協会  

    CiNii Research

  182. Eucalyptus camaldulensis density and fiber length estimated by near-infrared spectroscopy Reviewed

    Inagaki Tetsuya, Schwanninger Manfred, Kato Reina, Kurata Yohei, Thanapase Warunee, Puthson Pratuang, Tsuchikawa Satoru

    WOOD SCIENCE AND TECHNOLOGY   Vol. 46 ( 1-3 ) page: 143 - 155   2012.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Wood Science and Technology  

    Density and fiber length belong to the parameters that are used by the pulping industry as indicators of wood quality for different industrial processes and final paper products. The feasibility of Fourier transform near-infrared (FT-NIR) spectroscopy for the non-destructive evaluation of fiber length and air-dry density of fast-growing E. camaldulensis from Thailand was investigated using 50 samples. NIR spectra taken from solid wood and air-dry density as well as fiber length were used for partial least squares (PLS) regression analyses. It is the first time that the fiber length of E. camaldulensis solid wood could be predicted with high accuracy and precision and that the ratios of performance to deviation (RPD) obtained are the first that fully fulfill the requirements of AACC Method 39-00 (AACC 1999) for screening in breeding programs (RPD ≥ 2.5). The RPDs for cross-validation (test set validation) of the NIR-PLS-R models of 3.3 (3.8) for air-dry density and 3.5 (3.9) for fiber length allow drawing the conclusion that the models are at least applicable for screening in breeding programs as they lie in-between screening (RPD ≥ 2.5) and quality control (RPD ≥ 5). Even when 40% of the samples were removed in cross-validation of the air-dry density model, the RPD is 3.2, which confirms that the model is robust, stable, and well qualified for prediction. The good model statistics obtained in this study might be due to the fact that measurement sites for the measurement of NIR spectra, air-dry density, and fiber lengths were strictly coincided. © 2010 Springer-Verlag.

    DOI: 10.1007/s00226-010-0379-6

    Web of Science

    Scopus

  183. リグナ・ハノーバー2011名古屋大学ブース出展報告 Invited Reviewed

    土川 覚

    木材工業   Vol. 67 ( 2 ) page: 81-84   2012

     More details

    Authorship:Lead author   Language:Japanese  

  184. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発 Invited

    土川 覚

    Techno Innovation   Vol. 84   page: 19-23   2012

     More details

    Authorship:Lead author   Language:Japanese  

  185. Prediction of wood density independent of moisture conditions using near infrared spectroscopy

    Fujimoto, T.; Kobori, H.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 20 ( 3 ) page: 353-359   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  186. Rapid prediction of past climate condition from lake sediments by NIR spectroscopy Reviewed

    Inagaki, T.; Shinozuka, Y.; Yamada, K.; Yonenobu, H.; Tsuchikawa, S.; Yoshida, A.; Hoshino, Y.; Gotanda, K.; Yasuda, Y.

    Applied Spectroscopy   Vol. 66 ( 6 ) page: 673-679   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  187. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy Reviewed

    Inagaki, T.; Schwanninger, S.; Kato, R.; Kurata1, Y.; Thanapase, W.; Puthson, P.; Tsuchikawa, S.

    Wood Science and Technology   Vol. 46   page: 143-155   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  188. リグナ・ハノーバー2011名古屋大学ブース出展報告

    土川 覚

    木材工業   Vol. 67 ( 2 ) page: 81-84   2012

  189. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発

    土川 覚

    Techno Innovation   Vol. 84   page: 19-23   2012

  190. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy

    Inagaki, T, Schwanninger, S, Kato, R, Kurata1, Y, Thanapase, W, Puthson, P, Tsuchikawa, S

    Wood Science and Technology   Vol. 46   page: 143-155   2012

  191. Prediction of wood density independent of moisture conditions using near infrared spectroscopy

    Fujimoto, T, Kobori, H, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 20 ( 3 ) page: 353-359   2012

  192. Prediction of wood density independently of moisture conditions using near infrared spectroscopy Reviewed

    Fujimoto Takaaki, Kobori Hikaru, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 20 ( 3 ) page: 353 - 359   2012

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Near infrared (NIR) spectra obtained from 100 Japanese larch (Larix kaempferi) wood samples containing various amounts of moisture were used to examine the effect of moisture conditions on the accuracy of predicting wood density. Partial least squares regression (PLS-R) analysis was performed to predict wood density under air dry (DEN-ar), water impregnated (DEN-wi) and oven dry (DEN-ov) conditions. The NIR spectra varied with the moisture conditions of the wood, where the characteristic absorbance bands in the vicinity of 7320 cm-1 (1366 nm), 7160 cm-1 (1400 nm) and 7000 cm -1 (1428 nm) were related to cellulose and water. The spectral differences between high- and low-density samples varied depending on the moisture conditions; high-density samples showed low absorbance values at 7160 cm-1 when wet and showed high absorbance values at 7320 cm -1 and 7000 cm-1 when dry. DEN-ar, DEN-wi and DEN-ov could be predicted using spectra collected from the corresponding moisture conditions [coefficient of determination (R2) = 0.79-0.89; standard error of prediction (SEP) = 24-26 kg m-3]. Prediction of DEN-ar and DEN-ov could also be achieved using spectra collected from various moisture conditions (R2 = 0.86-0.87, SEP = 22 kg m-3). The loadings from PLS-R analysis indicated that the absorption bands in the vicinity of 7320 cm -1, 7160 cm-1 and 7000 cm-1 played an important role in predicting wood density. NIR spectroscopy has the potential to predict wood density independently of the moisture content of the sample. © 2012 IM Publications LLP. All rights reserved.

    DOI: 10.1255/jnirs.994

    Web of Science

    Scopus

  193. Rapid prediction of past climate condition from lake sediments by NIR spectroscopy

    Inagaki, T, Shinozuka, Y, Yamada, K, Yonenobu, H, Tsuchikawa, S, Yoshida, A, Hoshino, Y, Gotanda, K, Yasuda, Y

    Applied Spectroscopy   Vol. 66 ( 6 ) page: 673-679   2012

  194. Nondestructive Measurement of Wooden Materials by Near Infrared Spectroscopy : Present Conditions and Prospects

    TSUCHIKAWA Satoru

    Wood industry   Vol. 66 ( 10 ) page: 430 - 435   2011.10

  195. Nondestructive Measurement of Wooden Materials by Near Infrared Spectroscopy : Present Conditions and Prospects Reviewed

    TSUCHIKAWA Satoru

    Wood industry   Vol. 66 ( 10 ) page: 430 - 435   2011.10

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  196. Nondestructive Measurement of Wooden Materials by Near Infrared Spectroscopy : Present Conditions and Prospects Reviewed

    TSUCHIKAWA Satoru

    Wood industry   Vol. 66 ( 10 ) page: 430 - 435   2011.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Research

  197. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy Reviewed

    Kurata Yohei, Fujimoto Takaaki, Tsuchikawa Satoru

    HOLZFORSCHUNG   Vol. 65 ( 3 ) page: 389 - 395   2011.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Holzforschung  

    A new optical measurement system, the main components of which are a diode-pumped solid state laser and avalanche photodiodes, was introduced to clarify the optical characteristics of wood from the viewpoint of time-of-flight near infrared spectroscopy. The sample thickness and the wavelength of input pulsed laser clearly influenced the transmitted time-resolved profile. The effective optical path length became 15 times longer than the sample thickness. The optical model based on the diffusion approximation to the radiative transfer equation proved to be useful for thick samples, which can be optically regarded as an ideal diffuser, although wood is a structural material with non-homogeneous cellular structure. © 2011 by Walter de Gruyter Berlin New York.

    DOI: 10.1515/HF.2011.034

    Web of Science

    Scopus

  198. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy Reviewed

    Kurata, Y., Fujimoto, T., Tsuchikawa S.

    Holzforschung   Vol. 65   page: 389-395   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  199. 近赤外分光法による木質材料の非破壊計測 -現状と展望- Invited Reviewed

    土川 覚

    木材工業   Vol. 66 ( 10 ) page: 430-435   2011

     More details

    Authorship:Lead author   Language:Japanese  

  200. Application of NIR spectroscopy to wood products

    Tsuchikawa S.; Fujimoto, T.

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

     More details

    Language:English  

  201. Application of NIR spectroscopy to wood products

    Tsuchikawa S, Fujimoto, T

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

  202. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy

    Kurata, Y, Fujimoto, T, Tsuchikawa S

    Holzforschung   Vol. 65   page: 389-395   2011

  203. Application of NIR spectroscopy to wood products

    Tsuchikawa S, Fujimoto, T

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  204. Application of NIR spectroscopy to wood products

    Tsuchikawa S, Fujimoto, T

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  205. Feasibility of near-infrared spectroscopy for online multiple trait assessment of sawn lumber

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, TSUCHIKAWA Satoru

    Journal of wood science   Vol. 56 ( 6 ) page: 452 - 459   2010.12

     More details

    Publisher:Springer  

  206. Feasibility of near-infrared spectroscopy for online multiple trait assessment of sawn lumber Reviewed

    FUJIMOTO Takaaki, KURATA Yohei, MATSUMOTO Kazushige, TSUCHIKAWA Satoru

    Journal of wood science   Vol. 56 ( 6 ) page: 452 - 459   2010.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  207. Feasibility of near-infrared spectroscopy for online multiple trait assessment of sawn lumber Reviewed

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    JOURNAL OF WOOD SCIENCE   Vol. 56 ( 6 ) page: 452 - 459   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    Near-infrared (NIR) spectroscopy coupled with multivariate analysis was applied to estimate multiple traits of sawn lumber. The effects of the lumber conveying speed (LCS) and measurement resolution of spectra (MRS) on the calibrations were examined. NIR spectra ranging from 1300 to 2300 nm were acquired at LCSs of 10, 20, and 30 m/min and at MRSs of 2, 4, and 16 nm. Prediction models of bending strength (Fb), modulus of elasticity in bending tests (Eb), dynamic modulus of elasticity (Efr), and wood density (DEN) were developed using partial least-squares (PLS) analysis. LCS and MRS did not significantly influence the calibration performance for any wood property. The regression coefficients also showed no clear differences for any of the conditions. This indicates that the important explanatory variables included in the models are not greatly influenced by these measurement conditions. PLS2 analysis results, when presented graphically, allowed easy interpretation of the relationships between wood mechanical properties and chemical components, e. g., bending strength and stiffness were mainly related to polysaccharides cellulose and hemicellulose. NIR spectroscopy has considerable potential for online grading of sawn lumber, despite the harsh measurement conditions. © 2010 The Japan Wood Research Society.

    DOI: 10.1007/s10086-010-1122-5

    Web of Science

    Scopus

  208. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T., Matsumoto K., Kurata Y., Tsuchikawa S.

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

    Scopus

  209. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  210. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  211. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  212. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  213. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  214. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  215. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

  216. Difference of the Crystal Structure of Cellulose in Wood after Hydrothermal and Aging Degradation: A NIR Spectroscopy and XRD Study Reviewed

    Inagaki Tetsuya, Siesler Heinz W., Mitsui Katsuya, Tsuchikawa Satoru

    BIOMACROMOLECULES   Vol. 11 ( 9 ) page: 2300 - 2305   2010.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Biomacromolecules  

    The change of crystalline structure in hydrothermally treated hinoki wood was investigated by means of Fourier-transform near-infrared spectroscopy in combination with a deuterium exchange method and X-ray diffraction. The results were compared with analogous data of dry-exposed archeological wood taken from an old wooden temple. Although the decomposition of the amorphous regions in cellulose and hemicelluloses, which corresponds to an increase of the degree of crystallinity, was observed for both, archeologically and hydrothermally treated wood, the increase of crystallite thickness was confirmed only for hydrothermally treated wood. The increase of the average size of crystallites corresponds well to the measured decrease of the deuteration accessibility of the crystalline regions. As the accessibility of the crystalline regions decreased for both, D2O and t-butanol, it is assumed that due to the expansion of the crystalline domains by hydrothermal treatment several elementary fibrils are arranged at distances below 0.3 nm. © 2010 American Chemical Society.

    DOI: 10.1021/bm100403y

    Web of Science

    Scopus

    PubMed

  217. Effect of Crosscutting Crooked Sugi (Cryptomeria japonica) Logs on Sawing Yield and Quality of Sawn Lumber Reviewed

    Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

    FOREST PRODUCTS JOURNAL   Vol. 60 ( 3 ) page: 244 - 248   2010.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  218. Effect of Crosscutting Crooked Sugi (Cryptomeria japonica) Logs on Sawing Yield and Quality of Sawn Lumber Reviewed

    Y. Ikami, Y. Matsumura, K. Murata, S. Tsuchikawa

    FOREST PRODUCTS JOURNAL   Vol. 60 ( 3 ) page: 244 - 248   2010.5

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:FOREST PRODUCTS SOC  

    The objective of this study was to develop an efficient method for using crooked sugi (Cryptomeria japonica D. Don) logs by crosscutting the logs prior to sawing. We investigated the effect of crosscutting crooked logs on the sawing yield and the quality of sawn lumber and proposed an effective processing method. The sawing yield and the quality of sawn lumber were improved by crosscutting the logs one time. An economic analysis based on the processing intensity required for crooked logs, subjected to one-time crosscutting, and crook-free medium-quality logs was conducted. When the price of sawn lumber obtained from the crooked logs was equal to that of medium-quality logs, the net revenue obtained from crooked logs became nearly equal to that of medium-quality logs. The results demonstrated that the crooked logs could be used effectively by one-time crosscutting.

    Web of Science

  219. Effect of crosscutting crooked sugi (Cryptomeria japonica) logs on sawing yield and quality of sawn lumber Reviewed

    Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

    Forest Products Journal   Vol. 60 ( 3 ) page: 244 - 248   2010.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Forest Products Journal  

    The objective of this study was to develop an efficient method for using crooked sugi (Cryptomeria japonica D. Don) logs by crosscutting the logs prior to sawing. We investigated the effect of crosscutting crooked logs on the sawing yield and the quality of sawn lumber and proposed an effective processing method. The sawing yield and the quality of sawn lumber were improved by crosscutting the logs one time. An economic analysis based on the processing intensity required for crooked logs, subjected to one-time crosscutting, and crook-free medium-quality logs was conducted. When the price of sawn lumber obtained from the crooked logs was equal to that of medium-quality logs, the net revenue obtained from crooked logs became nearly equal to that of medium-quality logs. The results demonstrated that the crooked logs could be used effectively by onetime crosscutting. © Forest Products Society 2010.

    DOI: 10.13073/0015-7473-60.3.244

    Scopus

  220. Feasibility of Near-Infrared Spectroscopy for On-Line Grading of Sawn Lumber Reviewed

    Takaaki Fujimoto, Yohei Kurata, Kazushige Matsumoto, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 64 ( 1 ) page: 92 - 99   2010.1

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to evaluate the wood properties of sawn lumber of Japanese larch (Larix kaempferi), whose diffuse reflection spectra were acquired under static and moving conditions. Prediction models of the dynamic modulus of elasticity (E(fr)), the modulus of elasticity in bending tests (E(b)), the bending strength (F(b)), the wood density (DEN), and the moisture content (MC) were developed using partial least squares (PLS) analysis. For all wood properties, models obtained from data collected under the moving condition as an analogue of on-line measurement were superior to those from the static condition data. The regression coefficients for the PLS models predicting the mechanical properties in both static and moving conditions showed clear peaks at the absorption bands due to the three major polymers of wood, i.e., cellulose, hemicellulose, and lignin. NIR spectroscopy has high potential for the on-line grading of sawn lumber.

    Web of Science

  221. Feasibility of Near-Infrared Spectroscopy for On-Line Grading of Sawn Lumber

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 64 ( 1 ) page: 92 - 99   2010.1

     More details

  222. Feasibility of near-infrared spectroscopy for on-line grading of sawn lumber.

    Fujimoto T, Kurata Y, Matsumoto K, Tsuchikawa S

    Applied spectroscopy   Vol. 64 ( 1 ) page: 92 - 9   2010.1

  223. Feasibility of near infrared spectroscopy for on-line grading of sawn lumber Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 64   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  224. Effect of Crosscutting Sugi (Cryptomeria japonica D. Don) Logs on Sawing Yield and Quality of Sawn Lumber", Forest Products Journal Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Forest Products Journal   Vol. 60 ( 3 ) page: 244-248   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  225. Identification of dead and sound knots by near infrared spectroscopy Invited Reviewed

    Fujimoto, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 18   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  226. Difference of the crystal structure of cellulose in wood after hydrothermal and ageing degradation: A NIR spectroscopy and XRD study Reviewed

    Inagaki, T.; Siesler, H.; Mitsui, K.; Tsuchikawa, S.

    Biomacromolecules   Vol. 11   page: 2300-2306   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  227. Feasibility of near infrared spectroscopy for on-line multi-traits assessment of sawn lumber Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 56   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  228. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage Reviewed

    Inagaki, T.; Shinoda Y.; Miyazawa, M.; Takamura H.; Tsuchikawa S.

    Water Science and Technology   Vol. 61 ( 8 ) page: 1957-1963   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  229. Difference of the crystal structure of cellulose in wood after hydrothermal and ageing degradation: A NIR spectroscopy and XRD study

    Inagaki, T, Siesler, H, Mitsui, K, Tsuchikawa, S

    Biomacromolecules   Vol. 11   page: 2300-2306   2010

  230. Feasibility of near infrared spectroscopy for on-line multi-traits assessment of sawn lumber

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Journal of Wood Science   Vol. 56   2010

  231. Near-infrared spectroscopic assessment of contamination level of sewage Reviewed

    Inagaki Tetsuya, Shinoda Yukari, Miyazawa Mitsuhiro, Takamura Hitoshi, Tsuchikawa Satoru

    WATER SCIENCE AND TECHNOLOGY   Vol. 61 ( 8 ) page: 1957 - 1963   2010

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Water Science and Technology  

    We examined the use of near infrared (NIR) spectroscopy as a rapid technique for the evaluation of sewage quality. Influent water samples, primary sedimentation tank water samples, and final effluent water samples were collected from sewage treatment facilities in Nagoya, Japan and their NIR spectra obtained. Partial least squares (PLS) models for total phosphate (TP), total nitrogen (TN), biochemical oxygen demand (BOD), total organic carbon (TOC), and turbidity of sewage water were constructed from the NIR data. The models provided good correlation between measurements obtained conventionally and those predicted from spectroscopy. Spectral variation induced by background interference in samples affected accuracy. Loading plots and score plots derived from PLS regression analysis resolved the background interference and allowed highly accurate predictions. Spectral variation induced by contamination in the sewage was a main predictor of sewage quality. These results show that NIR spectroscopy shows potential for in-line, non-destructive measurement of sewage quality. © IWA Publishing 2010.

    DOI: 10.2166/wst.2010.070

    Web of Science

    Scopus

    PubMed

  232. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage

    Inagaki, T, Shinoda Y, Miyazawa, M, Takamura H, Tsuchikawa S

    Water Science and Technology   Vol. 61 ( 8 ) page: 1957-1963   2010

  233. Identification of dead and sound knots by near infrared spectroscopy Reviewed

    Fujimoto Takaaki, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 18 ( 6 ) page: 473 - 479   2010

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    This paper examines the identification of dead and sound knots on the wood surface using near infrared (NIR) spectroscopy. Fifty dead and sound knots samples were prepared and NIR diffuse-reflectance spectra were collected from these samples. The spectra of normal wood were also obtained from the neighbourhood of each knot. The wavenumber range from 6600 cm-1 to 5400 cm-1 (1515 nm to 1852 nm) was employed for the multivariate analysis after taking into consideration characteristics of the spectra. The soft independent modelling of class analogies (SIMCA) classification technique was conducted for classification of dead knots, sound knots and normal wood classes. Specific spectral features were found in dead and sound knots at the following absorption bands: 6130 cm-1, 5980 cm-1, 5800 cm-1 and 5700 cm-1, which were related to bark tissue and compression wood. The SIMCA model could identify the differences between dead and sound knots as well as the presence of knots. The loadings and discrimination powers were consistent with the spectral features, showing peaks due to bark tissue and compression wood. The bands provide useful information to determine the effective range of electromagnetic waves for image analysis. © IM Publications LLP 2010.

    DOI: 10.1255/jnirs.887

    Web of Science

    Scopus

  234. Identification of dead and sound knots by near infrared spectroscopy

    Fujimoto, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 18   2010

  235. Feasibility of near infrared spectroscopy for on-line grading of sawn lumber Reviewed

    藤本 高明, 土川 覚

    Applied Spectroscopy 64     page: 92 - 99   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  236. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method Reviewed

    Yonenobu Hitoshi, Tsuchikawa Satoru, Sato Karina

    VIBRATIONAL SPECTROSCOPY   Vol. 51 ( 1 ) page: 100 - 104   2009.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Vibrational Spectroscopy  

    The diffusion process of deuterated water (D2O) in washi (Japanese traditional paper) was investigated by means of a deuterium exchange method and Fourier-transform near-infrared (FT-NIR) transmission spectroscopy. The samples were the modern (AD 2003) hand-made washi and those from an archival collection of cultural artifacts (AD 1791 and 1615). Four absorption bands were identified in the NIR spectral range from 7200 to 6000 cm-1 which are due to OH groups in the amorphous, semi-crystalline and two types of crystalline regions of cellulose. The accessibility of D2O increased with decreasing state of order of cellulose, and the saturation accessibility increased with the age of the samples. It was suggested that during aging hemicellulose, which forms a composite with cellulose in paper, was progressively hydrolyzed, resulting in the expansion of inter-molecular distance between cellulose chains. The oldest sample showed a low diffusion rate compared with the others. SEM observation of the textile structures indicated that the oldest sample had two layers due to beating. It was estimated that the tight surface layer blocked the diffusant in the initial stage of the diffusion process. © 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.vibspec.2008.11.001

    Web of Science

    Scopus

  237. Influence of pith location on warp of lumber in sawing medium-quality sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami, Y; Murata, K; Matsumura, Y; Tsuchikawa, S

    EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS   Vol. 67 ( 3 ) page: 271 - 276   2009.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:European Journal of Wood and Wood Products  

    The forest and wood industry in Japan require the development of automation technology to produce high-quality lumber from medium-quality sugi (Cryptomeria japonica D. Don) logs. This study investigates the influence of pith location on the warp of lumber. While drying reduced the bow of lumber drastically its crook remained almost unchanged. Therefore, an effective sawing method to reduce crook was sought after. Crook measured immediately after sawing increased as the distance between the center of the lumber and the pith location along the width of lumber increased. A sawing method which takes pith location into account was concluded to be effective in reducing crook. Based on these results, a new sophisticated sawing procedure to produce high-quality lumber is proposed. © 2009 Springer-Verlag.

    DOI: 10.1007/s00107-009-0318-0

    Web of Science

    Scopus

  238. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-II: Hardwood Reviewed

    Inagaki, T.; Mitsui, K.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 63 ( 7 ) page: 753-758   2009.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  239. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Wood. Part II: Hardwood Reviewed

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 63 ( 7 ) page: 753 - 758   2009.7

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    Near-infrared (NIR) spectroscopy and chemometrics were applied to analyze the degradation mechanism of hardwood following hydrothermal treatment. NIR spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young&apos;s modulus parallel to grain, and cellulose crystallinity of artificially degraded leech as an analogue of archaeological wood were systematically measured. Partial least squares (PLS) regression analysis was employed to predict compressive Young&apos;s modulus using NIR spectra and various properties as independent variables. Results are also compared with previous data obtained from similar treatment of softwood (Hinoki cypress). The increase in cellulose crystallinity of hardwood during the initial stage of hydrothermal treatment (up to 5 hours) was correlated with an improvement in the mechanical properties of wood. Young&apos;s modulus for both hardwood and softwood showed a gradual decrease over five hours of hydrothermal treatment, which is proposed to be due to the degradation of polysaccharide.

    Web of Science

  240. Near-infrared spectroscopic investigation of the hydrothermal degradation mechanism of wood as an analogue of archaeological wood. Part II: hardwood. Reviewed

    Inagaki T, Mitsui K, Tsuchikawa S

    Applied spectroscopy   Vol. 63 ( 7 ) page: 753 - 8   2009.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Near-infrared (NIR) spectroscopy and chemometrics were applied to analyze the degradation mechanism of hardwood following hydrothermal treatment. NIR spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young's modulus parallel to grain, and cellulose crystallinity of artificially degraded beech as an analogue of archaeological wood were systematically measured. Partial least squares (PLS) regression analysis was employed to predict compressive Young's modulus using NIR spectra and various properties as independent variables. Results are also compared with previous data obtained from similar treatment of softwood (Hinoki cypress). The increase in cellulose crystallinity of hardwood during the initial stage of hydrothermal treatment (up to 5 hours) was correlated with an improvement in the mechanical properties of wood. Young's modulus for both hardwood and softwood showed a gradual decrease over five hours of hydrothermal treatment, which is proposed to be due to the degradation of polysaccharide. © 2009 Society for Applied Spectroscopy.

    DOI: 10.1366/000370209788701071

    Scopus

    PubMed

  241. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Wood. Part II: Hardwood Reviewed

    Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 63 ( 7 ) page: 753 - 758   2009.7

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  242. Application of time-of-flight near infrared spectroscopy to fruits -Analysis of absorption/scattering condition of NIR radiation by cross-correlation function of time-resolved profile- Reviewed

    Kurata, Y.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 63 ( 3 ) page: 306-312   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  243. Influence of pith location on warp of lumber in sawing medium quality Sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Holz als Roh- und Werkstoff   Vol. 67 ( 3 ) page: 271-276   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  244. Application of Time-of-Flight Near-Infrared Spectroscopy to Fruits: Analysis of Absorption and Scattering Conditions of Near-Infrared Radiation Using Cross-Correlation of the Time-Resolved Profile Reviewed

    Yohei Kurata, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 63 ( 3 ) page: 306 - 312   2009.3

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    The absorption and scattering conditions of near-infrared radiation in a grapefruit, a popular thick-peeled fruit, were investigated by time-of-flight near-infrared spectroscopy (TOF-NIRS). The cross-correlation function was introduced to obtain fine spectroscopic information from the time-resolved profile. Variation of the optical parameters in both the time-resolved profile and the cross-correlation function showed that the NIR radiation was largely absorbed in the peel and considerably scattered in the flesh of the fruit. It also reflected the straightness of the input pulsed laser. The substantial optical path length of the grapefruit estimated from the cross-correlation function was approximately 4 to 5 times as long as the nominal optical path length (NOPL). The cross-correlation function was an effective tool to analyze the absorption/scattering conditions of NIR radiation in a sample where an unstable light source such as a Nd:YAG laser with high output energy was employed.

    Web of Science

  245. Application of time-of-flight near-infrared spectroscopy to fruits: analysis of absorption and scattering conditions of near-infrared radiation using cross-correlation of the time-resolved profile. Reviewed

    Kurata Y, Tsuchikawa S

    Applied spectroscopy   Vol. 63 ( 3 ) page: 306 - 12   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The absorption and scattering conditions of near-infrared radiation in a grapefruit, a popular thick-peeled fruit, were investigated by time-of-flight near-infrared spectroscopy (TOF-NIRS). The cross-correlation function was introduced to obtain fine spectroscopic information from the time-resolved profile. Variation of the optical parameters in both the time-resolved profile and the cross-correlation function showed that the NIR radiation was largely absorbed in the peel and considerably scattered in the flesh of the fruit. It also reflected the straightness of the input pulsed laser. The substantial optical path length of the grapefruit estimated from the cross-correlation function was approximately 4 to 5 times as long as the nominal optical path length (NOPL). The cross-correlation function was an effective tool to analyze the absorption/scattering conditions of NIR radiation in a sample where an unstable light source such as a Nd:YAG laser with high output energy was employed. © 2009 Society for Applied Spectroscopy.

    DOI: 10.1366/000370209787599004

    Scopus

    PubMed

  246. Application of Time-of-Flight Near-Infrared Spectroscopy to Fruits: Analysis of Absorption and Scattering Conditions of Near-Infrared Radiation Using Cross-Correlation of the Time-Resolved Profile

    Kurata Yohei, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 63 ( 3 ) page: 306 - 312   2009.3

     More details

  247. Influence of pith location on warp of lumber in sawing medium quality Sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 67 ( 3 ) page: 271-276   2009.3

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  248. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method Invited Reviewed

    Yonenobu, H.; Sato, K.; Tsuchikawa, S.

    Vibrational Spectroscopy   Vol. 51   page: 100-104   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  249. Prediction of water content in Ligustrum japonicum leaf using NIR chemometric imaging Reviewed

    Kobori, H.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 17 ( 3 ) page: 151-157   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  250. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method

    Yonenobu, H, Sato, K, Tsuchikawa, S

    Vibrational Spectroscopy   Vol. 51   page: 100-104   2009

  251. Prediction of water content in Ligustrum japonicum leaf using NIR chemometric imaging

    Kobori, H, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 17 ( 3 ) page: 151-157   2009

  252. Prediction of water content in Ligustrum japonicum leaf using near infrared chemometric imaging Reviewed

    Kobori Hikaru, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 17 ( 3 ) page: 151 - 157   2009

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Leaf water content is one of the most important indicators of the plant growth status. However, the traditional measurement of leaf water content requires a destructive process. A new technique using near infrared (NIR) imaging with the aid of chemometrics was developed to predict leaf water content. This method makes it possible to evaluate the leaf water content without destruction. Ligustrum japonicum leaves were taken, and then the water content and spectroscopic images at the wavelength of 1450nm were obtained by a vidicon camera fitted with a band-pass filter. A calibration model able to predict water content with high accuracy was found by partial least square analysis, using cumulative histograms based on the luminance brightness as the explanatory variables. This research confirmed the feasibility of NIR chemometric imaging to monitor the plant growth condition. © IM Publications LLP 2009 All rights reserved.

    DOI: 10.1255/jnirs.836

    Web of Science

    Scopus

  253. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T., Matsumoto K., Kurata Y., Tsuchikawa S.

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

    Scopus

  254. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  255. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  256. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  257. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  258. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  259. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  260. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T, Matsumoto K, Kurata Y, Tsuchikawa S

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:10th World Conference on Timber Engineering 2008  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

  261. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood Reviewed

    Inagaki, T.; Mitsui, K.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 11 )   2008.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  262. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part I: Softwood Reviewed

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 62 ( 11 ) page: 1209 - 1215   2008.11

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    The degradation mechanism of softwood due to the variation of strength was analyzed in conjunction with spectroscopy and chemometrics, where the sample was thermally treated with a steam atmosphere. Near-infrared (NIR) spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young&apos;s modulus parallel to the grain, and cellulose crystallinity of artificially degraded hinoki cypresses as an analogue of archaeological objects were systematically measured. Partial least squares (PI,S) regression analysis was employed to predict compressive Young&apos;s modulus using NIR spectra and some kinds of wood properties as independent variables. Good prediction models were obtained for both independent variables. The scores and the loading plots derived from PLS analysis were applied to consistently explain the mechanism of hydrothermal degradation. It was suggested that the variation of compressive Young&apos;s modulus with hydrothermal treatment was governed by two main components, that is, depolymerization of polysaccharides and variation of cellulose crystallinity.

    Web of Science

  263. Near-infrared spectroscopic investigation of the hydrothermal degradation mechanism of wood as an analogue of archaeological objects. Part I: softwood. Reviewed

    Inagaki T, Mitsui K, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 11 ) page: 1209 - 15   2008.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The degradation mechanism of softwood due to the variation of strength was analyzed in conjunction with spectroscopy and chemometrics, where the sample was thermally treated with a steam atmosphere. Near-infrared (NIR) spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young's modulus parallel to the grain, and cellulose crystallinity of artificially degraded hinoki cypresses as an analogue of archaeological objects were systematically measured. Partial least squares (PLS) regression analysis was employed to predict compressive Young's modulus using NIR spectra and some kinds of wood properties as independent variables. Good prediction models were obtained for both independent variables. The scores and the loading plots derived from PLS analysis were applied to consistently explain the mechanism of hydrothermal degradation. It was suggested that the variation of compressive Young's modulus with hydrothermal treatment was governed by two main components, that is, depolymerization of polysaccharides and variation of cellulose crystallinity. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208786401563

    Scopus

    PubMed

  264. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part I: Softwood Reviewed

    Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 11 ) page: 1209 - 1215   2008.11

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  265. *Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique Reviewed

    Kobori, H.; Yonenobu, H.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 854-859   2008.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  266. Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique Reviewed

    Hikaru Kobori, Hitoshi Yonenobu, Junichi Noma, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 854 - 859   2008.8

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    A new optical system was developed and applied to automated separation of wood wastes, using a combined technique of visible-near-infrared (Vis-NIR) imaging analysis and chemometrics. Three kinds of typical wood wastes were used, i.e., non-treated, impregnated, and plastic-film overlaid wood. The classification model based on soft independent modeling of class analogy (SIMCA) was examined using the difference luminance brightness of a sample. Our newly developed system showed a good/promising performance in separation of wood wastes, with an average rate of correct separation of 89%. Hence, it is concluded that the system is efficiently feasible for online monitoring and separation of wood wastes in recycling mills.

    Web of Science

  267. Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood Reviewed

    Tetsuya Inagaki, Hitoshi Yonenobu, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 860 - 865   2008.8

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    We investigated the adsorption/desorption mechanism of water and the variation of water adsorption for modern and archaeological wood using near-infrared spectroscopy. A mixture model of water was used to decompose the near-infrared difference spectra into three components (free water molecules (S-0), those with one OH group engaged in hydrogen bonding (S-1), and those with two OH groups engaged in hydrogen bonding (S-2)) based on a principal component analysis. The variations of each water component with relative humidity could be explained by proposing a model that describes water absorption in three stages. It was concluded that the aging phenomenon in wood is due to the decrease of adsorption sites on hemicellulose and amorphous cellulose.

    Web of Science

  268. Estimation of sawn face width of Sugi (Cryptomeria japonica D. Don) logs by cross-sectional shape with approximation profile Reviewed

    Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

    HOLZ ALS ROH-UND WERKSTOFF   Vol. 66 ( 4 ) page: 243 - 247   2008.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Holz als Roh - und Werkstoff  

    In sawing systems producing high quality lumber from medium diameter sugi (Cryptomeria japonica D. Don) logs, operators must carefully decide the amount of setworks taking into consideration the sawn face width and appearance of knots so that the work efficiency often suffers considerable reduction. A simple mathematical method to estimate the sawn face width on the basis of cross-sectional shape with an approximation profile was proposed. Ninety cross-sectional shapes were measured using a newly developed measuring device and estimated as a circle or an ellipse, where 89% of the cross-sectional shapes fit the ellipses. The error margin in 72-75% of the sawn face width estimates was 2.0 cm or less, which was equal to the conventional value achieved by skilled operators. © 2008 Springer-Verlag.

    DOI: 10.1007/s00107-008-0242-8

    Web of Science

    Scopus

  269. Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique. Reviewed

    Kobori H, Yonenobu H, Noma J, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 8 ) page: 854 - 9   2008.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    A new optical system was developed and applied to automated separation of wood wastes, using a combined technique of visible-near-infrared (Vis-NIR) imaging analysis and chemometrics. Three kinds of typical wood wastes were used, i.e., non-treated, impregnated, and plastic-film overlaid wood. The classification model based on soft independent modeling of class analogy (SIMCA) was examined using the difference luminance brightness of a sample. Our newly developed system showed a good/promising performance in separation of wood wastes, with an average rate of correct separation of 89%. Hence, it is concluded that the system is efficiently feasible for online monitoring and separation of wood wastes in recycling mills. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208785284295

    Scopus

    PubMed

  270. Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood

    Inagaki Tetsuya, Yonenobu Hitoshi, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 860 - 865   2008.8

     More details

  271. Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood. Reviewed

    Inagaki T, Yonenobu H, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 8 ) page: 860 - 5   2008.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    We investigated the adsorption/desorption mechanism of water and the variation of water adsorption for modern and archaeological wood using near-infrared spectroscopy. A mixture model of water was used to decompose the near-infrared difference spectra into three components (free water molecules (S0), those with one OH group engaged in hydrogen bonding (S1), and those with two OH groups engaged in hydrogen bonding (S2)) based on a principal component analysis. The variations of each water component with relative humidity could be explained by proposing a model that describes water absorption in three stages. It was concluded that the aging phenomenon in wood is due to the decrease of adsorption sites on hemicellulose and amorphous cellulose. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208785284312

    Scopus

    PubMed

  272. Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique Reviewed

    Kobori Hikaru, Yonenobu Hitoshi, Noma Junichi, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 854 - 859   2008.8

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  273. Near Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood Reviewed

    Tsuchikawa S., Siesler H.

    Characterization of the Cellulosic Cell Wall     page: 123 - 137   2008.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Characterization of the Cellulosic Cell Wall  

    Near infrared transmission spectroscopy was used to monitor the diffusion process of deuterium-labeled molecules in wood samples. To better understand the state of order in wood cellulose, several diffusion experiments were performed with Sitka spruce and beech in D2O and two OD-deuterated alcohols of different geometry. Four absorption bands in the NIR region (7200-6100 cm-1) were assigned to 2 ×ν (OH) absorptions of OH groups in the amorphous, semi-crystalline, and the two kinds of intramolecularly hydrogen-bonded crystalline regions, respectively. The saturation accessibility varied characteristically with the OH groups in different states of order in the wood substance, the diffusants, and the wood species, respectively. The effect of the anatomical cellular structure on the accessibility is reflected in the variation of the diffusion rate with wood species. We proposed a new interpretation about the fine structure of the microfibrils in the cell wall by comparing a series of results for hardwood and softwood specimens. © 2006 Blackwell Publishing.

    DOI: 10.1002/9780470999714.ch10

    Scopus

  274. Monitoring of hydroxyl groups in wood during heat treatment using NIR spectroscopy Reviewed

    Mitsui Katsuya, Inagaki Tetsuya, Tsuchikawa Satoru

    BIOMACROMOLECULES   Vol. 9 ( 1 ) page: 286 - 288   2008.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Biomacromolecules  

    This paper deals with the evaluation of thermally treated wood by near-infrared (NIR) spectroscopy. In the NIR second derivative spectrum, the absorption band at 6913 cm-1 appeared with the procession of heat treatment, which conclusively assigned to the phenolic hydroxyl groups due to the lignin in comparison with the spectrum of acetylated spruce wood. As a result of the changes in the ratio of the areal integral calculated from spectral separation in the region of hydroxyl groups (7200-6100 cm-1) by the Gauss-Newton method, it was clear that the degradation of hydroxyl group in the cellulose started predominantly from the amorphous region and followed to semicrystalline and crystalline region. There was an obvious correlation between the weight decrement of wood and the decrement of hydroxyl groups in the cellulose by heat treatment. © 2008 American Chemical Society.

    DOI: 10.1021/bm7008069

    Web of Science

    Scopus

    PubMed

  275. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy Reviewed

    Mitsui, K.; Inagaki, T.; Tsuchikawa S.

    Biomacromolecules   Vol. 9   page: 286-288   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  276. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 529-537   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  277. *NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood" Reviewed

    Inagaki, T.; Yonenobu, H.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 861-865   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  278. Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Holz als Roh- und Werkstoff   Vol. 66 ( 4 ) page: 243-247   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  279. *Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple- Reviewed

    Kurata, Y.; Ikemoto, Y.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 139-142   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  280. *Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple-

    Kurata, Y, Ikemoto, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 139-142   2008

     More details

    時間飛行近赤外分光法を果実の光計測に応用し、内部品質評価の可能性を検討した。学内共同研究者:倉田洋平、池本有香

  281. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Takaaki Fujimoto, Yohei Kurata, Kazushige Matsumoto, Satoru Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 16 ( 6 ) page: 529 - 537   2008

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch (Larix gmelinii var.japonica x Larix kaempferi). The specific mechanical characteristics evaluated were modulus of elasticity (MOE), modulus of rupture (MOR) in bending tests, maximum crushing strength in compression parallel to grain (CS) dynamic modulus of elasticity of air-dried lumbers (E(fr)), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property. The calibrations had relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets and results suggested that NIR spectroscopy has the potential to predict mechanical properties of small clears with adequate accuracy (standardised prediction error=2.06-2.82). The PLS models based on spectra from the radial face (R(2)=0.73-0.891 of wood were slightly superior to those from the tangential face (R(2)=0.61-0.84). This might be due to the differences of the surface condition in terms of the anatomical structures and, thus, radial face better represents the sample. A reasonable predictive model for wood stiffness was also obtained from the full length lumber specimens, but the accuracy of the calibration for prediction was less than the small clear specimens (R(2)=0.49-0.78). The regression coefficients obtained from the PLS models showed similar trends in all mechanical properties. It was suggested that the absorption bands due to the OH-groups in cellulose were the major contributors to building robust models for predicting the mechanical properties of wood

    DOI: 10.1255/jnirs.813

    Web of Science

  282. Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 66 ( 4 ) page: 243-247   2008

  283. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 16 ( 6 ) page: 529 - 537   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch (Larix gmelinii var. japonica x Larix kaempferi). The specific mechanical characteristics evaluated were modulus of elasticity (MOE), modulus of rupture (MOR) in bending tests, maximum crushing strength in compression parallel to grain (CS), dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property. The calibrations had relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets and results suggested that NIR spectroscopy has the potential to predict mechanical properties of small clears with adequate accuracy (standardised prediction error=2.06-2.82). The PLS models based on spectra from the radial face (R2=0.73-0.89) of wood were slightly superior to those from the tangential face (R2=0.61-0.84). This might be due to the differences of the surface condition in terms of the anatomical structures and, thus, radial face better represents the sample. A reasonable predictive model for wood stiffness was also obtained from the full length lumber specimens, but the accuracy of the calibration for prediction was less than the small clear specimens (R2=0.49-0.78). The regression coefficients obtained from the PLS models showed similar trends in all mechanical properties. It was suggested that the absorption bands due to the OH-groups in cellulose were the major contributors to building robust models for predicting the mechanical properties of wood © IM Publications LLP 2008 All rights reserved.

    DOI: 10.1255/jnirs.818

    Web of Science

    Scopus

  284. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy

    Mitsui, K, Inagaki, T, Tsuchikawa S

    Biomacromolecules   Vol. 9   page: 286-288   2008

  285. Short communication - Application of time-of-flight near infrared spectroscopy to fruits-permeability of pulsed laser beam into Satsuma mandarin, White grapefruit and Fuji apple Reviewed

    Kurata Yohei, Ikernoto Yuka, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 16 ( 2 ) page: 139 - 142   2008

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    The permeability of a pulsed laser beam into Satsuma mandarin, White grapefruit and Fuji apple was compared by time-of-flight near infrared (ToF-NIR) spectroscopy. In this study, a compact measurement system including a dye-doped plastic laser cavity with a wavelength of 800 nm and an avalanche photodiode were employed. The NIR radiation attenuance (i.e. optical density) in apple was higher than in the citrus fruit. The peak maxima of transmitted radiation of intact Satsuma mandarin increased 130 times more than that of intact grapefruit. Differences in diameter related directly to attenuance. The peak maxima of transmitted radiation of peeled grapefruit increased 250 times more than that of intact grapefruit; however, these increases were not found for Satsuma mandarin or apple. NIR radiation attenuance of the grapefruit peel was greater than for the peel of the other fruits. The incident pulsed laser beam was uniformly scattered in the citrus sample, whereas the scattering condition of the pulsed laser beam in apple might not be uniform because of the presence of core tissue. Thus, while the pulsed laser beam could be transmitted through citrus fruit and apple, the effect of fruit size and peel on the NIR radiation attenuance characteristically varied. © IM Publications LLP 2008 All rights reserved.

    DOI: 10.1255/jnirs.764

    Web of Science

    Scopus

  286. Estimation of Wood Stiffness and Strength Properties of Hybrid Larch by Near-infrared Spectroscopy", Applied Spectroscopy Reviewed

    Fujimoto, T.; Yamamoto, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 61 ( 8 ) page: 882-888   2007.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  287. Estimation of wood stiffness and strength properties of hybrid larch by near-infrared spectroscopy

    Fujimoto Takaaki, Yamamoto Hiroyuki, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 61 ( 8 ) page: 882 - 888   2007.8

     More details

  288. Estimation of wood stiffness and strength properties of hybrid larch by near-infrared spectroscopy. Reviewed

    Fujimoto T, Yamamoto H, Tsuchikawa S

    Applied spectroscopy   Vol. 61 ( 8 ) page: 882 - 8   2007.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    This work was undertaken to investigate the feasibility of near-infrared (NIR) spectroscopy for estimating wood mechanical properties, i.e., modulus of elasticity (MOE) and modulus of rupture (MOR) in bending tests. Two sample sets having large and limited density variation were prepared to examine the effects of wood density on estimation of MOE and MOR by the NIR technique. Partial least squares (PLS) analysis was employed and it was found that the relationships between laboratorymeasured and NIR-predicted values were good in the case of sample sets having large density variation. MOE could be estimated even when density variation in the sample set was limited. It was concluded that absorption bands due to the OH group in the semi-crystalline or crystalline regions of cellulose strongly influenced the calibrations for bending stiffness of hybrid larch. This was also suggested from the result that both a-cellulose content and cellulose crystallinity showed moderate positive correlation to wood stiffness. © 2007 Society for Applied Spectroscopy.

    DOI: 10.1366/000370207781540150

    Scopus

    PubMed

  289. Estimation of wood stiffness and strength properties of hybrid larch by near-infrared spectroscopy Reviewed

    Takaaki Fujimoto, Hiroyuki Yamamoto, Satoru Tsuchikawa

    APPLIED SPECTROSCOPY   Vol. 61 ( 8 ) page: 882 - 888   2007.8

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    This work was undertaken to investigate the feasibility of near-infrared (NIR) spectroscopy for estimating wood mechanical properties, i.e., modulus of elasticity (MOE) and modulus of rupture (MOR) in bending tests. Two sample sets having large and limited density variation were prepared to examine the effects of wood density on estimation of MOE and MOR by the NIR technique. Partial least squares (PLS) analysis was employed and it was found that the relationships between laboratory-measured and NIR-predicted values were good in the case of sample sets having large density variation. MOE could be estimated even when density variation in the sample set was limited. It was concluded that absorption bands due to the OH group in the semi-crystalline or crystalline regions of cellulose strongly influenced the calibrations for bending stiffness of hybrid larch. This was also suggested from the result that both alpha-cellulose content and cellulose crystallinity showed moderate positive correlation to wood stiffness.

    Web of Science

  290. 第2回近赤外分光部会シンポジウム Reviewed

    土川 覚

    分光研究 = Journal of the spectroscopical research of Japan   Vol. 56 ( 2 ) page: 86   2007.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Research

  291. 第2回近赤外分光部会シンポジウム

    土川 覚

    分光研究 = Journal of the spectroscopical research of Japan   Vol. 56 ( 2 )   2007.4

  292. 第2回近赤外分光部会シンポジウム Reviewed

    土川 覚

    分光研究 = Journal of the spectroscopical research of Japan   Vol. 56 ( 2 ) page: 86   2007.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  293. 第2回近赤外分光部会シンポジウム Reviewed

    土川 覚

    分光研究 = Journal of the spectroscopical research of Japan   Vol. 56 ( 2 )   2007.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  294. *A Review of Recent Near Infrared Research for Wood and Paper Invited Reviewed

    Tsuchikawa, S.

    Applied Spectroscopy Review   Vol. 42 ( 1 ) page: 43-71   2007

     More details

    Authorship:Lead author   Language:English  

  295. *A Review of Recent Near Infrared Research for Wood and Paper

    Tsuchikawa, S

    Applied Spectroscopy Review   Vol. 42 ( 1 ) page: 43-71   2007

     More details

    本論文は、1990年代以降急速に広まった木材科学・工業分野への近赤外分光法の適用事例を網羅的に紹介した総説形式のものである。約150の文献が、詳細に紹介されている。

  296. A review of recent near infrared research for wood and paper Reviewed

    Tsuchikawa Satoru

    APPLIED SPECTROSCOPY REVIEWS   Vol. 42 ( 1 ) page: 43 - 71   2007

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy Reviews  

    This review article introduces recent technical and scientific reports in terms of near infrared (NIR) spectroscopy in the wood and paper science and industry, where interest has increased during the last couple decades. Many researchers reported the NIR technique was useful to detect multi information in both chemical and physical properties of wood materials, although it was widely used in a state where characteristic cellular structure was retained. In the case of application of NIR spectroscopy to pulp and paper, many publications have pointed out its high probability as online measurement techniques during paper-making process control. Arguments referred to the importance of NIR spectroscopy as fundamental and applied research of wood and paper. Copyright © Taylor & Francis Group, LLC.

    DOI: 10.1080/05704920601036707

    Web of Science

    Scopus

  297. Instrumentation: Instruments

    Mcclure W.

    Near-Infrared Spectroscopy in Food Science and Technology     page: 73 - 108   2006.2

     More details

    Publisher:Near-Infrared Spectroscopy in Food Science and Technology  

    DOI: 10.1002/9780470047705.ch4

    Scopus

  298. Instrumentation: Time-of-Flight Spectroscopy

    Tsuchikawa S.

    Near-Infrared Spectroscopy in Food Science and Technology     page: 109 - 120   2006.2

     More details

    Publisher:Near-Infrared Spectroscopy in Food Science and Technology  

    DOI: 10.1002/9780470047705.ch4

    Scopus

  299. Sampling Techniques Reviewed

    Tsuchikawa S

    Near-Infrared Spectroscopy in Food Science and Technology     page: 133 - 143   2006.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Near-Infrared Spectroscopy in Food Science and Technology  

    DOI: 10.1002/9780470047705.ch5

    Scopus

  300. Near infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood

    Tsuchikawa Satoru, Siesler H. W.

    CHARACTERIZATION OF THE CELLULOSIC CELL WALL     page: 123 - +   2006

     More details

  301. Low atmospheric temperature dependence on photo degradation of wood Reviewed

    K Mitsui, S Tsuchikawa

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY   Vol. 81 ( 2 ) page: 84 - 88   2005.11

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    This paper deals with the photodegradation of wood in low atmospheric temperature region (-40 to 50 degrees C), and discusses the changes in color and IR spectra. The color and IR spectra of wood hardly changed with photo-irradiation at -40 degrees C but did at -20 degrees C. Therefore, it is thought that the photo-energy causes the scission of chemical bonds or the production of radicals; however, heat energy is needed to yellow of wood (i.e., to produce quinone). In case of softwoods, the absorption of the carbonyl band consisted of two sub-bands, and the carbonyl band at around 1710 cm(-1) increased at lower temperature than that at around 1760 cm(-1) by light-irradiation. Such IR measurement due to lignin degradation means that the photodegradation of softwoods is faster than that of hardwoods. The color change by exposure to light in the low temperature was also caused by the degradation of lignin. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotobiol.2005.05.011

    Web of Science

    Scopus

    PubMed

  302. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantations by near infrared spectroscopy for improving wood selection for high quality pulp

    Terdwongworakul Anupun, Punsuwan Vittaya, Thanapase Warunee, TSUCHIKAWA Satoru

    Journal of wood science   Vol. 51 ( 2 ) page: 167 - 171   2005.4

     More details

    Publisher:Springer  

  303. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantations by near infrared spectroscopy for improving wood selection for high quality pulp Reviewed

    TERDWONGWORAKUL Anupun, PUNSUWAN Vittaya, THANAPASE Warunee, TSUCHIKAWA Satoru

    Journal of Wood Science   Vol. 51 ( 2 ) page: 167 - 171   2005.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  304. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation

    Tsuchikawa S, Hirashima Y, Sasaki Y, Ando K

    APPLIED SPECTROSCOPY   Vol. 59 ( 1 ) page: 86 - 93   2005.1

     More details

  305. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation. Reviewed

    Tsuchikawa S, Hirashima Y, Sasaki Y, Ando K

    Applied spectroscopy   Vol. 59 ( 1 ) page: 86 - 93   2005.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Estimation of the density along with the tensile strength of wood within both the elastic and plastic deformation ranges, represented as modulus of elasticity (MOE) and ultimate tensile stress (UTS), respectively, were performed using near-infrared (NIR) spectroscopy. A partial least squares (PLS) analysis was applied to the measurements of density, MOE, and UTS, and resulted in a high accuracy of prediction, independent of wood species. The correlation coefficient between the NIR spectra and criterion variables, and the regression vector resulting from the PLS analysis, suggested that the characteristic absorption bands were strongly related to the predictability of each property. In the case of softwood, absorption bands due to intra-molecular hydrogen-bonded OH groups in the crystalline regions of cellulose, which are oriented preferentially in a direction parallel to the cellulose chain, might strongly affect the tensile strength of softwood. Hardwoods have much more complex and variable structures than softwoods; therefore, it was supposed that the key factor governing the tensile strength in hardwood would be the interaction between the three principal constituents (i.e., cellulose, hemicellulose, and lignin) of wood.

    DOI: 10.1366/0003702052940413

    Scopus

    PubMed

  306. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation Reviewed

    S Tsuchikawa, Y Hirashima, Y Sasaki, K Ando

    APPLIED SPECTROSCOPY   Vol. 59 ( 1 ) page: 86 - 93   2005.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    Estimation of the density along with the tensile strength of wood within both the elastic and plastic deformation ranges, represented as modulus of elasticity (MOE) and ultimate tensile stress (UTS), respectively, were performed using near-infrared (NIR) spectroscopy. A partial least squares (PLS) analysis was applied to the measurements of density, MOE, and UTS, and resulted in a high accuracy of prediction, independent of wood species. The correlation coefficient between the NIR spectra and criterion variables, and the regression vector resulting from the PLS analysis, suggested that the characteristic absorption bands were strongly related to the predictability of each property. In the case of softwood, absorption bands due to intra-molecular hydrogen-bonded OH groups in the crystalline regions of cellulose, which are oriented preferentially in a direction parallel to the cellulose chain, might strongly affect the tensile strength of softwood. Hardwoods have much more complex and variable structures than softwoods; therefore, it was supposed that the key factor governing the tensile strength in hardwood would be the interaction between the three principal constituents (i.e., cellulose, hemicellulose, and lignin) of wood.

    Web of Science

  307. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantation by near infrared spectroscopy aiming high quality pulp wood selection Reviewed

    Terdwongworakul, A.; Punsuwan, V.; Thanapase, W.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 51   page: 167-171   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  308. *Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    Tsuchikawa, S.; Yonenobu, H.; Siesler, H. W.

    The Analyst   Vol. 130   page: 379-384   2005

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  309. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    Wu Y.Q.; Tsuchikawa S.; Hayashi K.

    Journal of Near Infrared Spectroscopy   Vol. 13   page: 371-376   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  310. Low atmospheric temperature dependence on photodegradation of wood Reviewed

    Mitsui, K.; Tsuchikawa S.

    Journal of Photochemistry and Photobiology B: Biology   Vol. 81   page: 84-88   2005

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  311. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation Reviewed

    Tsuchikawa, S.; Hirashima, Y.; Sasaki, Y.; Ando, K.

    Applied Spectroscopy   Vol. 59 ( 1 ) page: 78-85   2005

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  312. Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method. Reviewed

    土川 覚

    The Analyst. 130     page: 379 - 384   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  313. *Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method

    Tsuchikawa, S, Yonenobu, H, Siesler, H. W

    The Analyst   Vol. 130   page: 379-384   2005

     More details

    本論文では、重水素置換法と近赤外分光法を組み合わせた新しい手法によって、木材の経年劣化様式を分子レベルで詳細に観察し、細胞壁内におけるセルロースミクロフィブリル間の間隙寸法のオングストロームオーダの経年変化状況を把握することに成功した。これによって、NIR-Archeometryとも呼ぶべき新しい考古計測学手法の基盤が確立された。

  314. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments

    Wu YQ, Tsuchikawa S, Hayashi K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 13 ( 6 ) page: 371 - 376   2005

     More details

  315. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    Wu Y.Q., Tsuchikawa S., Hayashi K.

    Journal of Near Infrared Spectroscopy   Vol. 13 ( 6 ) page: 371 - 376   2005

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    The relationships between colour parameters and chemical components of Eucalyptus grandis wood under a steaming and a heating process were examined by near infrared (NIR) spectroscopy to assess the best drying conditions. The results indicated that: 1) under steaming conditions, the second derivatives of absorption bands due to OH in the crystalline region of cellulose and CH in hemicellulose presented statistically significant positive correlation values for L* or b* and a decrease in lignin might be the reason leading to the colour changes; 2) under heat-treated conditions, the colour darkening process in wood was often accompanied by a severe collapse phenomena, especially at the 100°C condition. It was found spectroscopically that the concentrations of cellulose and hemicellulose were increased relatively by the collapse occurring and that lignin decreased with the elevated drying temperature. The crystalline regions in cellulose and hemicellulose were related to "blueness" (partial darkness) of E. grandis caused by the drying process. © NIR Publications 2005.

    DOI: 10.1255/jnirs.568

    Scopus

  316. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    YQ Wu, S Tsuchikawa, K Hayashi

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 13 ( 6 ) page: 371 - 376   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    The relationships between colour parameters and chemical components of Eucalyptus grandis wood under a steaming and a heating process were examined by near infrared (NIR) spectroscopy to assess the best drying conditions. The results indicated that: 1) under steaming conditions, the second derivatives of absorption bands due to OH in the crystalline region of cellulose and CH in hemicellulose presented statistically significant positive correlation values for V or b* and a decrease in lignin might be the reason leading to the colour changes; 2) under heat-treated conditions, the colour darkening process in wood was often accompanied by a severe collapse phenomena, especially at the 100 degrees C condition. It was found spectroscopically that the concentrations of cellulose and hemicellulose were increased relatively by the collapse occurring and that lignin decreased with the elevated drying temperature. The crystalline regions in cellulose and hemicellulose were related to "blueness" (partial darkness) of E. grandis caused by the drying process.

    Web of Science

  317. Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    Tsuchikawa S, Yonenobu H, Siesler HW

    ANALYST   Vol. 130 ( 3 ) page: 379 - 384   2005

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Analyst  

    The ageing degradation of the fine wood structure of dry-exposed archaeological wood was investigated by Fourier transform near-infrared spectroscopy with the aid of a deuterium exchange method. The archaeological wood sample was taken from an old wooden temple in Japan (late 7th century), which has been designated as a UNESCO world heritage site. Comparing the analytical results with those of a modern wood sample of the same species, the ageing process of archaeological wood was clarified as a change in the state of order on a macromolecular structural level. It can be concluded from NIR spectra that the amorphous region, and partially semi-crystalline region, in cellulose, hemicellulose, and lignin decreased by the ageing degradation, whereas the crystalline region in cellulose was not affected by the ageing. The accessibility of the diffusant to effect H/D-exchange was monitored by an OH-related absorption band obtained from FT-NIR transmission spectroscopy and characteristically varied with the ageing process of the wood samples, the absorption bands characteristic of a specific state of order and the diffusion agent. Finally, we proposed a morphological model to describe the variation of the fine structure of the microfibrils in the cell wall with ageing degradation. The state of microfibrils changed loosely by ageing, so that elementary fibrils were arranged loosely under 5 Å, whereas several elementary fibrils in the modern wood were arranged in very close proximity under 3 Å to each other. © The Royal Society of Chemistry 2005.

    DOI: 10.1039/b412759e

    Web of Science

    Scopus

    PubMed

  318. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantation by near infrared spectroscopy aiming high quality pulp wood selection

    Terdwongworakul, A, Punsuwan, V, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 51   page: 167-171   2005

  319. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantations by near infrared spectroscopy for improving wood selection for high quality pulp Reviewed

    Terdwongworakul A, Punsuwan V, Thanapase W, Tsuchikawa S

    JOURNAL OF WOOD SCIENCE   Vol. 51 ( 2 ) page: 167 - 171   2005

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    Near-infrared (NIR) spectroscopy has been demonstrated as a means for rapid nondestructive determination of the chemical composition and final pulp yield of Eucalyptus camaldulensis in Thailand tree plantations. Multiple linear regression (MLR) analysis and partial least squares (PLS) analysis were introduced to develop statistical models in terms of calibration equations for total pulp yield, screened pulp yield, and contents of α-cellulose, pentosans, and lignin in wood. In MLR analysis, a reasonably good calibration equation was found only for pentosans (standard error of prediction (SEP): 0.98%). The PLS analysis improved the accuracy of prediction for every criterion variable, especially for pentosans (SEP: 0.91%) and lignin (SEP: 0.52%). Also, in the case of screened pulp yield, we were able to use such a statistical result as an indicator of the characteristics of the pulp and paper. Thus, NIR spectroscopy could be satisfactorily used as an effective assessment technique for Eucalyptus camaldulensis plantation trees. © The Japan Wood Research Society 2005.

    DOI: 10.1007/s10086-004-0633-3

    Web of Science

    Scopus

  320. Near-Infrared Spectroscopic Study of the Physical and Mechanical Properties of Wood with Meso-and Micro-Scate Anatomical Observation. Reviewed

    土川 覚

    Applied Spectroscopy 59・1     page: 86 - 93   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  321. Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    土川 覚

    The Analyst 130     page: 379 - 384   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  322. Near-Infrared Spectroscopic Study of the Physical and Mechanical Propertics of Wood with Meso- and Micro-Scale Anatomical Observation Reviewed

    土川 覚

    Applied Spectroscopy 59・1     page: 86 - 93   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  323. Near-Infrared Spectroscopic Study of the Physical and Mechanical Properties of Wood with Meso-and Micro-Scale Anatomical Observation Reviewed

    土川 覚

    Applied Spectroscopy 59・1     page: 86 - 93   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  324. Spectroscopic monitoring of wood characteristics variation by light-irradiation Reviewed

    Tsuchikawa, S; Inoue, K; Mitsui, K

    FOREST PRODUCTS JOURNAL   Vol. 54 ( 11 ) page: 71 - 76   2004.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  325. Spectroscopic monitoring of wood characteristics variation by light-irradiation Reviewed

    Tsuchikawa S., Inoue K., Mitsui K.

    Forest Products Journal   Vol. 54 ( 11 ) page: 71 - 76   2004.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Forest Products Journal  

    This study deals with the feasibility of near-infrared (NIR) spectroscopy to qualitatively monitor the variation in wood characteristics caused by ultraviolet light-irradiation. It was found from the second derivative NIR spectra that OH groups in the amorphous regions in cellulose, hemicellulose, and lignin could be easily decomposed into low molecular matter by light-irradiation. The degradation rates for the amorphous regions in cellulose and hemicellulose were faster than that for lignin. Such degradation of main chemical compounds in wood by light-irradiation was closely associated with yellowing of the samples. The ratio of the second derivative of absorbance (Rλ) at λ nm after light-irradiation to before irradiation, was investigated. In the case of OH groups in the amorphous region, we could not find an obvious difference in the trend of Rλ, between wood species. However, it was suggested from Rλ that the decomposition state of lignin by light-irradiation varied characteristically with wood species. Furthermore, we found a strong correlation between Rλ due to lignin and chroma coordinates (i.e.; δb*), independent of wood species. In the case of hemicellulose, there were considerable differences in Rλ vs. δb* between softwoods and hardwoods.

    Scopus

  326. Wood photography using light irradiation and heat treatment Reviewed

    K Mitsui, A Murata, S Tsuchikawa, M Kohara

    COLOR RESEARCH AND APPLICATION   Vol. 29 ( 4 ) page: 312 - 316   2004.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JOHN WILEY & SONS INC  

    To apply the coloring method using light irradiation and thermal treatment to print photographs on wood, the effect of the transmittance of negative films was investigated. DeltaE* decreased with light irradiation when specimens covered with films with transmittances exceeding 20% were irradiated for 100 h. It was thought that this phenomenon was due to the decrease in Deltab*. The color of light-irradiated wood changed remarkably with thermal treatment; however, the change in the color of exposed specimens covered with films with transmittances exceeding roughly, 20% became constant. Clear photographs could be printed on wood using negative films with transmittances less than approximately 20%. Furthermore, the difference between the maximum and minimum values of DeltaE* after thermal treatment was about 22. Humans can distinguish four to seven colors that can be created by this method. (C) 2004 Wiley Periodicals, Inc.

    DOI: 10.1002/col.20027

    Web of Science

    Scopus

  327. Application of time-of-flight near infrared spectroscopy for detecting sugar and acid contents in apples Reviewed

    Tsuchikawa S, Hamada T

    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY   Vol. 52 ( 9 ) page: 2434 - 2439   2004.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Agricultural and Food Chemistry  

    A newly constructed optical measurement system was introduced to nondestructively measure the composition of the inside of an apple by time-of-flight near-infrared spectroscopy (TOF-NIRS). As sugar content increased, optical parameters concerned with time-resolved profile of transmitted pulsed light (the attenuance of peak maxima, At, the time delay of peak maxima, Δt, and the variation of full width at half-maximum, Δw) decreased gradually. When the acid content increased, At and Δw increased; however, a significant tendency could not be found for Δt. At, Δt, and Δw were employed as the explanatory variables for multiple linear regression, principle component regression, and partial least-squares analysis. It was possible to predict both sugar and acid contents in an apple with high precision by TOF-NIRS. Especially, the superiority of TOF-NIRS lied in more precise determination of acid content.

    DOI: 10.1021/jf030705v

    Web of Science

    Scopus

    PubMed

  328. New dating technique for wood-based cultural properties using near infrared spectroscopy(Proceedings of the 16^<th> Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2003)

    Yonenobu Hitoshi, Tsuchikawa Satoru, Oda Hirotaka, Siesler Heinz W.

    Summaries of Researches using AMS at Nagoya University   ( 15 ) page: 74 - 82   2004.3

     More details

    Publisher:Nagoya University  

    Non-destructive measurement of properties were investigated for wood-based cultural properties using near infrared spectroscopy (NIRS). Antique samples of washi paper scrolls and a pillar member of old wooden building were used for the analysis of temporal degradation. The results obtained show good agreement with the conventional, destructive analysis. In consequence, it is concluded that NIRS shows good potential as a non-destructive dignostic tool for wood-based cultural properties. New non-destructive dating technique was developed using dendrochronologically dated wood samples. NIR absorbance peaks for main wood components show highly linear correlation with tree-ring dates. Partial least regression was performed to calibrate NIR absorbance to age. The NIR dating method shows good performance in accuracy which is almost close to those in tree-ring dating and is higher than those in AMS radiocarbon dating.

    DOI: 10.18999/sumrua.15.74

  329. Spectroscopic Monitoring of Wood Characteristics Variation by Light-Irradiation Reviewed

    "Tsuchikawa, S.; Inoue, K.; Mitsui K."

    Forest Products Journal   Vol. 54   page: 71-76   2004.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  330. Spectroscopic Monitoring of Wood Characteristics Variation by Light-Irradiation Reviewed

    Tsuchikawa, S, Inoue, K, Mitsui K

    Forest Products Journal   Vol. 54   page: 71-76   2004.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  331. Wood Photography Using Light-Irradiation and Heat Treatment Reviewed

    Mitsui, K.; Murata, A.; Tsuchikawa, S.; Kohara M.

    Color Research and Application   Vol. 29 ( 4 ) page: 312-315   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  332. Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples Reviewed

    Tsuchikawa, S.; Hamada, T.

    Journal of Agricultural and Food Chemistry   Vol. 52 ( 9 ) page: 2434-2439   2004

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  333. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa, S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  334. Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples

    Tsuchikawa, S, Hamada, T

    Journal of Agricultural and Food Chemistry   Vol. 52 ( 9 ) page: 2434-2439   2004

     More details

    本論文では、光伝播の強度・時間変化をナノ秒オーダで詳細に把握することによって、試料内部情報を非破壊で検出する時間飛行近赤外分光法(TOF-NIRS)を世界で初めて提案するとともに、これをリンゴの糖度・酸度検出に適応し、既存の手法では達し得なかった精度で推定可能となることを示した。

  335. Damage cumulation on wood by composition of several loading factors

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 2 ) page: 129 - 131   2004

     More details

    Publisher:Gifu University  

  336. Damage cumulation on wood by composition of several loading factors Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 2 ) page: 129 - 131   2004

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

    CiNii Research

  337. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  338. Damage cumulation on wood by composition of several loading factors Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 2 ) page: 129 - 131   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

  339. 近赤外分光法による新しい考古計測学の確立 Reviewed

    米延 仁志, 土川 覚

    第20回記念非破壊分析シンポジウム講演要旨集 20     page: 91 - 97   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  340. 近赤外分光法による新しい考古計測学の確立 Reviewed

    米延 仁志, 土川 覚

    第20回記念非破壊分析シンポジウム講演要旨集 20     page: 91 - 97   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  341. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  342. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  343. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  344. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  345. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  346. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy" Reviewed

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  347. 近赤外分光法による木質系廃棄物の判別分析 Invited

    "土川覚,山登香織"

    木材保存   Vol. 29   page: 259-262   2003.11

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  348. Near-infrared spectroscopic comparison of antique and modern wood

    Yonenobu H, Tsuchikawa S

    APPLIED SPECTROSCOPY   Vol. 57 ( 11 ) page: 1451 - 1453   2003.11

     More details

  349. Near-infrared spectroscopic comparison of antique and modern wood. Reviewed

    Yonenobu H, Tsuchikawa S

    Applied spectroscopy   Vol. 57 ( 11 ) page: 1451 - 3   2003.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The temporal degradation of old wooden building material was estimated by using near-infrared (NIR) spectrometry. The difference second-derivative NIR spectra suggest that hemicellulose and holocellulose decreased while lignin increased relatively. It was revealed that nondestructive NIR spectroscopy is a useful technique in examining properties of antique wood.

    DOI: 10.1366/000370203322554635

    Scopus

    PubMed

  350. 近赤外分光法による木質系廃棄物の判別分析 Invited Reviewed

    土川覚, 山登香織

    木材保存   Vol. 29   page: 259-262   2003.11

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  351. Application of near-infrared spectroscopy to wood discrimination Reviewed

    Tsuchikawa S., Inoue K., Noma J., Hayashi K.

    Journal of Wood Science   Vol. 49 ( 1 ) page: 29 - 35   2003.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This study deals with a new nondestructive discriminant analysis by which wood can be classified on the basis of a combination of near-infrared (NIR) spectroscopy and Mahalanobis' generalized distance. Its accuracy and reasonability were examined for wood samples with various moisture contents ranging from oven-dried to a fully saturated free water state. In a discriminant analysis employing second derivative spectra, each wood group was well distinguished. Mahalanobis' generalized distances between softwoods are relatively independent of analytical pattern, whereas the distances between hardwoods are large for easy classification. There may be two reasons for selecting a wavelength: (1) when the chemical component of wood substance relates to the discriminant analysis; and (2) when the difference in moisture content with wood species relates to them. When we correctly construct the database of NIR spectra, confirming the purpose of the analysis, suitable wood discrimination should be possible.

    DOI: 10.1007/s100860300005

    Scopus

  352. Discriminant analysis of wood-based materials using near-infrared spectroscopy Reviewed

    Tsuchikawa S., Yamato K., Inoue K.

    Journal of Wood Science   Vol. 49 ( 3 ) page: 275 - 280   2003.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This study deals with the suitable discriminant techniques of wood-based materials by means of near-infrared spectroscopy (NIRS) and several chemometric analyses. The concept of Mahalanobis' generalized distance, K nearest neighbors (KNN), and soft independent modeling of class analogy (SIMCA) were evaluated to determine the best analytical procedure. The difference in the accuracy of classification with the spectrophotometer, the wavelength range as the explanatory variables, and the light-exposure condition of the sample were examined in detail. It was difficult to apply Mahalanobis' generalized distances to the classification of wood-based materials where NIR spectra varied widely within the sample category. The performance of KNN in the NIR region (800-2500nm), for which the device used in the laboratory was employed, exhibited a high rate of correct answers of validation (>98%) independent of the light-exposure conditions of the sample. When employing the device used in the field, both KNN and SIMCA revealed correct answers of validation (>88%) at wavelengths of 550-1010nm. These results suggest the applicability of NIRS to a reasonable classification of used wood at the factory and at job sites.

    DOI: 10.1007/s10086-002-0471-0

    Scopus

  353. Discriminant analysis of wood-based materials using near-infrared spectroscopy

    Tsuchikawa Satoru, Yamato Kaori, Inoue Kinuyo

    Journal of wood science   Vol. 49 ( 3 ) page: 275 - 280   2003.6

     More details

    Publisher:Springer  

  354. Discriminant analysis of wood-based materials using near-infrared spectroscopy Reviewed

    TSUCHIKAWA Satoru, YAMATO Kaori, INOUE Kinuyo

    Journal of Wood Science   Vol. 49 ( 3 ) page: 275 - 280   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  355. 近赤外分光法の木材非破壊検査への応用 Invited

    土川覚

    木工機械   Vol. 197   page: 2-5   2003.6

     More details

    Authorship:Lead author   Language:Japanese  

  356. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: Softwood

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 667 - 674   2003.6

     More details

  357. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: hardwood. Reviewed

    Tsuchikawa S, Siesler HW

    Applied spectroscopy   Vol. 57 ( 6 ) page: 675 - 81   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Fourier transform near-infrared (FT-NIR) transmission spectroscopy was applied to monitor the diffusion process of deuterium-labeled molecules in hardwood (Beech). The results are compared with previous data obtained on softwood (Sitka spruce) in order to consistently understand the state of order in cellulose of wood. The saturation accessibility and diffusion rate varied characteristically with the OH groups in different states of order in the wood substance, the diffusants, and the wood species, respectively. The variation of saturation accessibility should be associated with the fundamental difference of the fine structure such as the microfibrils in the wood substance. The effect of the anatomical cellular structure on the accessibility was reflected in the variation of the diffusion rate with the wood species. The size effect of the diffusants also played an important role for the diffusion process in wood. Since the volumetric percentage of wood fibers and wood rays is relatively similar, the dichroic effects due to the anisotropy of the cellulose chains were apparently diminished. Finally, we proposed a new interpretation of the fine structure of the microfibrils in the cell wall by comparing a series of results from hardwood and softwood. Each elementary fibril in the hardwood has a more homogeneous arrangement in the microfibrils compared to that in the softwood.

    DOI: 10.1366/000370203322005373

    Scopus

    PubMed

  358. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

  359. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: softwood. Reviewed

    Tsuchikawa S, Siesler HW

    Applied spectroscopy   Vol. 57 ( 6 ) page: 667 - 74   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The diffusion process of several molecules (D2O, n-butanol (OD) and t-butanol (OD)) In softwood (Sitka spruce) was investigated by means of a deuterium exchange method and Fourier transform near-infrared (FT-NIR) polarization spectroscopy. The location of OH groups in different states of order of cellulose in wood was clarified by analyzing the FT-NIR transmission spectra ranging from 7200 to 6000 cm-1. Four absorption bands were assigned to 2 × ν(OH) absorptions of the amorphous regions, OH groups in semicrystalline regions, and two types of intramolecular hydrogen-bonded OH groups in the crystalline regions, respectively. The saturation level of accessibility was very different for these absorption bands (i.e., 70-80, 60, and 40-50% for the amorphous, semi-crystalline, and crystalline regions, respectively). However, the saturation accessibilities for each absorption band varied little with molecular structure and geometry of the diffusants. The diffusion rate of D2O was much faster than that of n-butanol (OD) and t-butanol (OD) for all states of orders. The size effect of the butanols led to slight differences in the diffusive transport in the crystalline regions.

    DOI: 10.1366/000370203322005364

    Scopus

    PubMed

  360. 近赤外分光法の木材非破壊検査への応用 Invited

    土川覚

    木工機械   Vol. 197   page: 2-5   2003.6

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  361. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood, Part. 1 : softwood Reviewed

    TSUCHIKAWA S

    Appl Spectrosc   Vol. 57 ( 6 ) page: 667 - 674   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  362. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  363. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  364. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  365. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  366. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  367. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  368. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  369. Application of time-of-flight near-infrared spectroscopy to detect sugar and acid content in Satsuma mandarin

    Tsuchikawa S, Sakai E, Inoue K, Miyamoto K

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 128 ( 3 ) page: 391 - 396   2003.5

     More details

  370. Application of time-of-flight near-infrared spectroscopy to detect sugar and acid content in Satsuma mandarin Reviewed

    Tsuchikawa S., Sakai E., Inoue K., Miyamoto K.

    Journal of the American Society for Horticultural Science   Vol. 128 ( 3 ) page: 391 - 396   2003.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    Time-of-flight near infrared spectroscopy (TOF-NIRS) was applied to the detection of sugar and acid content in Satuma mandarin (Citrus unshiu Marc). The combined effects on the time resolved profiles of soluble solids, free acids, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (At) and time delay of peak maxima (Δt) increased as sugar content increased. However, these optical parameters decreased with increases in acid content. In the case of a model sample of a polyurethane block immersed in specified solutions, At and Δt decreased by adding sucrose or citric acid. These results suggested that time resolved profile was governed not only by the concentration of soluble solid or free acid but also by other inherent factors of a fruit; for example, an optical characteristic of tissue or difference in refractive index between the tissue substance and the liquid. Results indicated the optimum optical parameters for detection of sugar and acid content were At and Δt, respectively.

    DOI: 10.21273/jashs.128.3.0391

    Scopus

  371. Application of Near Infrared Spectroscopy (NIR) to light-irradiated wood Reviewed

    Mitsui, K; Tsuchikawa, S

    HOLZ ALS ROH-UND WERKSTOFF   Vol. 61 ( 2 ) page: 159 - 160   2003.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Holz als Roh - und Werkstoff  

    The absorbility of water in wood varies with the light-irradiation time. Thus, near infrared spectroscopy proved to be a useful method allowing the detection of changes in chemical structure of wood after light-irradiation. In addition, it may also be suitable for the realization of a new coloring method of wood.

    DOI: 10.1007/S00107-002-0361-6

    Web of Science

    Scopus

  372. Application of near-infrared spectroscopy to wood discrimination

    Tsuchikawa Satoru, Inoue Kinuyo, Noma Junichi, HAYASHI Kazuo

    Journal of wood science   Vol. 49 ( 1 ) page: 29 - 35   2003.2

     More details

    Publisher:Springer  

  373. Application of near-infrared spectroscopy to wood discrimination Reviewed

    TSUCHIKAWA Satoru, INOUE Kinuyo, NOMA Junichi, HAYASHI Kazuo

    Journal of Wood Science   Vol. 49 ( 1 ) page: 29 - 35   2003.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  374. Application of Near Infrared Spectroscopy to Light-Irradiated Wood Reviewed

    "Mitsui, K.; Tsuchikawa, S."

    Holz als Roh- und Werkstoff   Vol. 61   page: 159-160   2003.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  375. Application of time-of-flight near-infrared spectroscopy for detection of sugar content and acid degrees in Satsuma Mandarin Reviewed

    "Tsuchikawa, S.; Sakai, E.; Inoue, K.; Miyamoto, K."

    Journal of American Society of Horticultural Science   Vol. 128   page: 391-396   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  376. Discriminant Analysis of Wood Based Materials using Near Infrared Spectroscopy. Reviewed

    "Tsuchikawa, S.; Yamato, K.; Inoue, K."

    Journal of Wood Science   Vol. 49   page: 275-280   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  377. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: Softwood Reviewed

    "Tsuchikawa, S.; Siesler, H. W."

    Applied Spectroscopy   Vol. 57   page: 667-674   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  378. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    "Tsuchikawa, S.; Siesler, H. W."

    Applied Spectroscopy   Vol. 57   page: 675-681   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  379. Non-destructive NIR Spectroscopic Measurement of Antique Washi Calligraphic Scrolls Reviewed

    "Yonenobu, H.; Tsuchikawa, S."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 407-411   2003.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  380. Near-Infrared Spectroscopic Comparison of Antique and Modern Wood Reviewed

    "Yonenobu, H.; Tsuchikawa, S."

    Applied Spectroscopy   Vol. 57 ( 11 ) page: 1451-1453   2003.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  381. Application of time-of-flight near infrared spectroscopy for detecting sugar content and acidity in apples Invited

    "Tsuchikawa, S.; Hamada, T."

    NIR news   Vol. 14   page: 6-8   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  382. Discriminant Analysis of Wood Based Materials with Weathering Damage by Near Infrared Spectroscopy Reviewed

    "Tsuchikawa, S.; Yamato, K."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 391-399   2003.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  383. Near-Infrared Spectroscopic Comparison of Antique and Modern Wood Reviewed

    Yonenobu, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 57 ( 11 ) page: 1451-1453   2003.1

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  384. Application of time-of-flight near-infrared spectroscopy for detection of sugar content and acid degrees in Satsuma Mandarin Reviewed

    Tsuchikawa, S, Sakai, E, Inoue, K, Miyamoto, K

    Journal of American Society of Horticultural Science   Vol. 128   page: 391-396   2003.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  385. Application of Near Infrared Spectroscopy to Light-Irradiated Wood Reviewed

    Mitsui, K, Tsuchikawa, S

    Holz als Roh- und Werkstoff   Vol. 61   page: 159-160   2003.1

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  386. Application of time-of-flight near infrared spectroscopy for detecting sugar content and acidity in apples Invited Reviewed

    Tsuchikawa, S, Hamada, T

    NIR news   Vol. 14   page: 6-8   2003.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  387. Spectroscopic Monitoring of Biomass Modification by Light-Irradiation with Heat Treatment Reviewed

    "Tsuchikawa, S.; Murata, A.; Kohara, M.; Mitsui K."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 401-405   2003

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  388. Evaluation of Elastic Modulus of Wood Surface Using Small Specimen

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 61 - 63   2003

     More details

    Publisher:Gifu University  

  389. Copying Photographic Images on Wood Surface by Light-Irradiation and Heat Treatment

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 57 - 60   2003

     More details

    Publisher:Gifu University  

  390. Discriminant analysis of wood-based materials using near-infrared spectroscopy

    Tsuchikawa S, Yamato K, Inoue K

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 3 ) page: 275 - 280   2003

     More details

  391. Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy

    Tsuchikawa S, Yamato K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 391 - 399   2003

     More details

  392. Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls

    Yonenobu H, Tsuchikawa S, Oda H

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 407 - 411   2003

     More details

  393. 近赤外分光法による木質系廃棄物の判別分析

    土川 覚, 山登 香織

    木材保存   Vol. 29 ( 6 ) page: 259 - 262   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本木材保存協会  

    DOI: 10.5990/jwpa.29.259

    CiNii Research

  394. Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy Reviewed

    S Tsuchikawa, K Yamato

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 391 - 399   2003

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    This research was aimed at finding a suitable discriminate technique for wood-based materials which had suffered from weathering damage, as an analogue of waste wood condition, by means of near infrared (NIR) spectroscopy and several kinds of chemometrics. The feasibility of Mahalanobis generalised distance, K nearest neighbours (KNN) or soft independent modelling of class analogy (SIMCA) as the classification method of wooden materials was examined in detail. The differences in the accuracy of classification with the spectrophotometer (for example, laboratory use and field use), pre-treatment of NIR spectra or the wavelength range as the explanatory variables were also taken into account. Five categories of wood-based materials (solid wood, laminated wood, particle or fibreboard, impregnated wood and overlaid wood) were exposed to outdoor sunlight for up to six months. It was difficult to apply Mahalanobis generalised distance to the classification of five material types where the NIR spectra varied greatly with the sample categories. Both of KNN and SIMCA presented the highest correct classification of over 93%, independent of the spectrophotometer. These results support the applicability of NIR spectroscopy to the classification of waste wood at the actual factory and job site.

    Web of Science

  395. Application of near-infrared spectroscopy to wood discrimination Reviewed

    S Tsuchikawa, K Inoue, J Noma, K Hayashi

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 1 ) page: 29 - 35   2003

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER-VERLAG TOKYO  

    This study deals with a new nondestructive discriminant analysis by which wood can be classified on the basis of a combination of near-infrared (NIR) spectroscopy and Mahaianobis' generalized distance. Its accuracy and reasonability were examined for wood samples with various moisture contents ranging from oven-dried to a fully saturated free water state. In a discriminant analysis employing second derivative spectra, each wood group was well distinguished. Mahalanobis' generalized distances between softwoods are relatively independent of analytical pattern, whereas the distances between hardwoods are large for easy classification. There may be two reasons for selecting a wavelength: (1) when the chemical component of wood substance relates to the discriminant analysis; and (2) when the difference in moisture content with wood species relates to them. When we correctly construct the database of NIR spectra, confirming the purpose of the analysis, suitable wood discrimination should be possible.

    Web of Science

  396. Discriminant analysis of wood-based materials using near-infrared spectroscopy Reviewed

    S Tsuchikawa, K Yamato, K Inoue

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 3 ) page: 275 - 280   2003

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER-VERLAG TOKYO  

    This study deals with the suitable discriminant techniques of wood-based materials by means of near-infrared spectroscopy (NIRS) and several chemometric analyses. The concept of Mahalanobis' generalized distance. K nearest neighbors (KNN), and soft independent modeling of class analogy (SIMCA) were evaluated to determine the best analytical procedure. The difference in the accuracy of classification with the spectrophotometer. the wavelength range as the explanatory variables, and the light-exposure condition of the sample were examined in detail. It was difficult to apply Mahalanobis' generalized distances to the classification of wood-based materials where NIR spectra varied widely within the sample category. The performance of KNN in the NIR region (800-2500nm). for which the device used in the laboratory was employed, exhibited a high rate of correct answers of validation (&gt;98%) independent of the light-exposure conditions of the sample. When employing the device used in the field. both KNN and SIMCA revealed correct answers of validation (&gt;88%) at wavelengths of 550-1010nm. These results suggest the applicability of NIRS to a reasonable classification of used wood at the factory and at job sites.

    Web of Science

  397. Copying Photographic Images on Wood Surface by Light-Irradiation and Heat Treatment Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 57 - 60   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

    CiNii Research

  398. Evaluation of Elastic Modulus of Wood Surface Using Small Specimen Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 61 - 63   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

    CiNii Research

  399. Application of near-infrared spectroscopy to wood discrimination Reviewed

    Tsuchikawa S, Inoue K, Noma J, Hayashi K

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 1 ) page: 29 - 35   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  400. Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment Reviewed

    Tsuchikawa S., Murata A., Kohara M., Mitsui K.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 401 - 405   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    This study discusses the use of near infrared spectroscopy for monitoring of the process by which biomass is modified by light-irradiation and heat treatment. As a change in the colour of wood is closely related to the change in its physicochemical structure, we investigated the relationship between the tristimulus values and the diffusely-reflected near infrared spectra of wood samples during a constrained modification process. Such basic research is required to develop a new method of colouring wood without paint. The change in colour with heat treatment was much greater in light-irradiated wood than in non-irradiated wood. The change in the colour of wood by light-irradiation and heat treatment is related to the degradation of lignin and hemicellulose, which was evident from the variation of absorption bands at 1672 nm for CH in aromatic skeletal and 1724 nm for CH in furanose or pyranose. NIR spectroscopy will become a useful method for the detection of a change in chemical structure of wood caused by light-irradiated and heat treatment.

    DOI: 10.1255/jnirs.391

    Scopus

  401. Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment Reviewed

    Tsuchikawa S, Murata A, Kohara M, Mitsui K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 401 - 405   2003

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  402. Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls Reviewed

    Yonenobu H., Tsuchikawa S., Oda H.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 407 - 411   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Degradation of antique washi paper was examined by non-destructive near infrared spectroscopy. Difference second derivative spectra of the modern minus antique samples were analysed for the absorption peaks due to the main chemical components of washi paper, i.e. cellulose and hemicellulose. The absorption peaks were decreased for amorphous and semi-crystalline regions of cellulose and for hemicellulose, showing the results consistent with conventional, destructive sugar analysis. It is concluded that near infrared spectroscopy is a useful technique for the non-destructive monitoring of the degradation of the chemical properties of washi paper.

    DOI: 10.1255/jnirs.392

    Scopus

  403. Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy Reviewed

    Tsuchikawa S., Yamato K.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 391 - 399   2003

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    This research was aimed at finding a suitable discriminate technique for wood-based materials which had suffered from weathering damage, as an analogue of waste wood condition, by means of near infrared (NIR) spectroscopy and several kinds of chemometrics. The feasibility of Mahalanobis generalised distance, K nearest neighbours (KNN) or soft independent modelling of class analogy (SIMCA) as the classification method of wooden materials was examined in detail. The differences in the accuracy of classification with the spectrophotometer (for example, laboratory use and field use), pre-treatment of NIR spectra or the wavelength range as the explanatory variables were also taken into account. Five categories of wood-based materials (solid wood, laminated wood, particle or fibreboard, impregnated wood and overlaid wood) were exposed to outdoor sunlight for up to six months. It was difficult to apply Mahalanobis generalised distance to the classification of five material types where the NIR spectra varied greatly with the sample categories. Both of KNN and SIMCA presented the highest correct classification of over 93%, independent of the spectrophotometer. These results support the applicability of NIR spectroscopy to the classification of waste wood at the actual factory and job site.

    DOI: 10.1255/jnirs.390

    Scopus

  404. Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls Reviewed

    H Yonenobu, S Tsuchikawa, H Oda

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 407 - 411   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    Degradation of antique washi paper was examined by non-destructive near infrared spectroscopy. Difference second derivative spectra of the modern minus antique samples were analysed for the absorption peaks due to the main chemical components of washi paper, i.e. cellulose and hemicellulose. The absorption peaks were decreased for amorphous and semi-crystalline regions of cellulose and for hemicellulose, showing the results consistent with conventional, destructive sugar analysis. It is concluded that near infrared spectroscopy is a useful technique for the non-destructive monitoring of the degradation of the chemical properties of washi paper.

    Web of Science

  405. Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment Reviewed

    S Tsuchikawa, A Murata, M Kohara, K Mitsui

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 401 - 405   2003

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    This study discusses the use of near infrared spectroscopy for monitoring of the process by which biomass is modified by light-irradiation and heat treatment. As a change in the colour of wood is closely related to the change in its physicochemical structure, we investigated the relationship between the tristimulus values and the diffusely-reflected near infrared spectra of wood samples during a constrained modification process. Such basic research is required to develop a new method of colouring wood without paint. The change in colour with heat treatment was much greater in light-irradiated wood than in non-irradiated wood. The change in the colour of wood by light-irradiation and heat treatment is related to the degradation of lignin and hemicellulose, which was evident from the variation of absorption bands at 1672 nm for CH in aromatic skeletal and 1724 urn for CH in furanose or pyranose. NIR spectroscopy will become a useful method for the detection of a change in chemical structure of wood caused by light-irradiated and heat treatment.

    Web of Science

  406. Evaluation of Elastic Modulus of Wood Surface Using Small Specimen Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 61 - 63   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

  407. Copying Photographic Images on Wood Surface by Light-Irradiation and Heat Treatment Reviewed

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 57 - 60   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Gifu University  

  408. Application of time-of-flight near infrared spectroscopy to wood with anisotropic cellular structure. Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Aplied Spectroscopy   Vol. 56   page: 869-876   2002.7

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  409. Application of time-of-flight near-infrared Spectroscopy to wood with anisotropic cellular structure

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 56 ( 7 ) page: 869 - 876   2002.7

     More details

  410. Application of time-of-flight near-infrared Spectroscopy to wood with anisotropic cellular structure Reviewed

    S Tsuchikawa, S Tsutsumi

    APPLIED SPECTROSCOPY   Vol. 56 ( 7 ) page: 869 - 876   2002.7

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SOC APPLIED SPECTROSCOPY  

    The newly constructed optical measurement system, which was mainly composed of a parametric tunable laser and a near-infrared photoelectric multiplier, was introduced to clarify the optical characteristics of wood with anisotropic cellular structure on the basis of the time-of-flight near-infrared spectroscopy (TOF-NIRS). The combined effects of the cellular structure of the wood sample, the wavelength of the laser beam, and the detection position of transmitted light on the time-resolved profiles were investigated in detail. The substantial optical pathlength calculated from the time-resolved profile was outstandingly larger than the sample thickness. The substance of the wood was directly related to the time delay of light propagation. In applying TOF-NIRS to the cellular structural materials, it is very important to give attention to the difference in the light scattering within the cell wall and that caused by the multiple specular-like reflections between cell walls. The newly proposed empirical equation, considering the effects of optical parameters, could well express the wavelength and sample thickness dependency of the time delay of the peak maxima. The time-resolved profile was intensively governed by the combination of light-absorbing and -scattering conditions and the degree of anisotropy. These basic data will be essential for this system to put an in-process measurement system in the wood industry to practical use.

    Web of Science

  411. Application of time-of-flight near-infrared spectroscopy to wood with anisotropic cellular structure Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 56 ( 7 ) page: 869 - 876   2002.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The newly constructed optical measurement system, which was mainly composed of a parametric tunable laser and a near-infrared photoelectric multiplier, was introduced to clarify the optical characteristics of wood with anisotropic cellular structure on the basis of the time-of-flight near-infrared spectroscopy (TOF-NIRS). The combined effects of the cellular structure of the wood sample, the wavelength of the laser beam, and the detection position of transmitted light on the time-resolved profiles were investigated in detail. The substantial optical pathlength calculated from the time-resolved profile was outstandingly larger than the sample thickness. The substance of the wood was directly related to the time delay of light propagation. In applying TOF-NIRS to the cellular structural materials, it is very important to give attention to the difference in the light scattering within the cell wall and that caused by the multiple specular-like reflections between cell walls. The newly proposed empirical equation, considering the effects of optical parameters, could well express the wavelength and sample thickness dependency of the time delay of the peak maxima. The time-resolved profile was intensively governed by the combination of light-absorbing and -scattering conditions and the degree of anisotropy. These basic data will be essential for this system to put an in-process measurement system in the wood industry to practical use.

    DOI: 10.1366/000370202760171545

    Scopus

  412. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples. Reviewed

    "Tsuchikawa, S.; Kumada, S.; Inoue, K.; Cho, R."

    Journal of American Society of Horticultural Science   Vol. 127   page: 303-308   2002.3

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  413. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples

    Tsuchikawa S, Kumada S, Inoue K, Cho RK

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 127 ( 2 ) page: 303 - 308   2002.3

     More details

  414. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples Reviewed

    S Tsuchikawa, S Kumada, K Inoue, RK Cho

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 127 ( 2 ) page: 303 - 308   2002.3

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER SOC HORTICULTURAL SCIENCE  

    Time-of-flight near-infrared spectroscopy (TOF-NIRS) was used to investigate optical characteristics of water-cored tissue in 'Fuji' apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. The combined effects on the time resolved profiles of water core, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (A(t)), time delay of peak maxima (Deltat), and variation of full width at half maximum (Deltaw) decreased gradually as water core increased. Water-cored tissue transmitted much more energy because of the filling of intercellular spaces with liquid, so that the light path time through a sample decreased. These parameters were also strongly dependent on detection position and wavelength of the laser beam. The substantial optical path length calculated from Deltat at lambda = 800 run was 10 to 17 times, while that for lambda = 900 nm varied from six to 11 times the distance of the diameter of the fruit. Results indicated the optimum optical parameter for detection of water core was Deltat.

    Web of Science

  415. Application of near infrared spectroscopy to wood discrimination. Reviewed

    "Tsuchikawa, S.; Inoue, K.; Noma, J.; Hayashi, K."

    Journal of Wood Science   Vol. 49   page: 29-35   2002.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  416. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure Reviewed

    TSUCHIKAWA Satoru

    Analytical Sciences/Supplements   Vol. 17icas ( 0 ) page: i463 - i466   2002

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society for Analytical Chemistry  

    DOI: 10.14891/analscisp.17icas.0.i463.0

    CiNii Research

  417. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples Reviewed

    Tsuchikawa S., Kumada S., Inoue K., Cho R.K.

    Journal of the American Society for Horticultural Science   Vol. 127 ( 2 ) page: 303 - 308   2002

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    Time-of-flight near-infrared spectroscopy (TOF-NIRS) was used to investigate optical characteristics of water-cored tissue in 'Fuji' apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. The combined effects on the time resolved profiles of water core, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (At), time delay of peak maxima (Δt), and variation of full width at half maximum (Δw) decreased gradually as water core increased. Water-cored tissue transmitted much more energy because of the filling of intercellular spaces with liquid, so that the light path time through a sample decreased. These parameters were also strongly dependent on detection position and wavelength of the laser beam. The substantial optical path length calculated from Δt λ = 800 nm was 10 to 17 times, while that for λ = 900 nm varied from six to 11 times the distance of the diameter of the fruit. Results indicated the optimum optical parameter for detection of water core was Δt.

    DOI: 10.21273/jashs.127.2.303

    Scopus

  418. Directional characteristics of near infrared light reflected from wood Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Holzforschung   Vol. 55 ( 5 ) page: 534 - 540   2001.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Holzforschung  

    A near infrared auto-goniophotometer was designed to acquire detailed information on optical characteristics of a biological material which had a cellular structure, such as wood. The reflected light, which originated from the irradiation of polarized near infrared light, was separated into an unpolarized and a polarized component by using two polarizing filters. The standardized reflected intensities of each component at various incident angles θ and observation angles η, ρ,up(θ, η) and ρp(θ, η), were measured. Sitka spruce samples with various thicknesses were used. The measurements showed that the directional characteristics of the unpolarized component were affected significantly by the irradiation conditions and the sample thickness. Particularly, these varied with the wavelength of incident light λ. This shows that the directional characteristics models we proposed previously are reasonable. On the other hand, matrices of the directional characteristics for polarized components typically show an elliptical shape which is strongly affected by incident angle and only slighly by λ. Based on these results, the effects of sample thickness on the spectral directional characteristics were determined.

    DOI: 10.1515/HF.2001.086

    Scopus

  419. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure Invited Reviewed

    Tsuchikawa S.

    Analytical Sciences   Vol. 17   page: 463-466   2001.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  420. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure Invited Reviewed

    Tsuchikawa S

    Analytical Sciences   Vol. 17   page: 463-466   2001.10

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  421. Directional Characteristics of Near Infrared Light Reflected from Wood Reviewed

    "Tsuchikawa, S., Torii, M. and Tsutsumi, S."

    Holzforschung   Vol. 55   page: 534-540   2001.8

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  422. Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy Invited Reviewed

    RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE   Vol. 3   page: 269-283   2001

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  423. Directional characteristics of near infrared light reflected from wood

    Tsuchikawa S, Torii M, Tsutsumi S

    HOLZFORSCHUNG   Vol. 55 ( 5 ) page: 534 - 540   2001

     More details

  424. Directional characteristics of near infrared light reflected from wood Reviewed

    S Tsuchikawa, M Torii, S Tsutsumi

    HOLZFORSCHUNG   Vol. 55 ( 5 ) page: 534 - 540   2001

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER & CO  

    A near infrared auto-goniophotometer was designed to acquire detailed information on optical characteristics of a biological material which had a cellular structure, such as wood. The reflected light, which originated from the irradiation of polarized near infrared light, was separated into an unpolarized and a polarized component by using two polarizing filters. The standardized reflected intensities of each component at various incident angles theta and observation angles eta, rho (up)(theta, eta) and rho (p)(theta, eta), were measured. Sitka spruce samples with various thicknesses were used. The measurements showed that the directional characteristics of the unpolarized component were affected significantly by the irradiation conditions and the sample thickness. Particularly, these varied with the wavelength of incident light lambda. This shows that the directional characteristics models we proposed previously are reasonable. On the other hand, matrices of the directional characteristics for polarized components typically show an elliptical shape which is strongly affected by incident angle and only slightly by lambda. Based on these results, the effects of sample thickness on the spectral directional characteristics were determined.

    Web of Science

  425. Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy Invited Reviewed

    RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE   Vol. 3   page: 269-283   2001

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  426. 第34回名古屋国際木工機械展の概要

    土川 覚

    木材工業 = Wood industry   Vol. 55 ( 3 ) page: 118 - 121   2000.3

     More details

    Publisher:日本木材加工技術協会  

  427. 第34回名古屋国際木工機械展の概要 Reviewed

    土川 覚

    木材工業 = Wood industry   Vol. 55 ( 3 ) page: 118 - 121   2000.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本木材加工技術協会  

    記事種別: 会議・学会報告・シンポジウム

    CiNii Research

  428. 第34回名古屋国際木工機械展の概要 Reviewed

    土川 覚

    木材工業 = Wood industry   Vol. 55 ( 3 ) page: 118 - 121   2000.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:日本木材加工技術協会  

  429. Non-traditional application of NIRS to detect physical and chemical conditions of biological materials Invited Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Recent Research Developments in Applied Spectroscopy   Vol. 3   page: 113-134   2000.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  430. Nondestructive Measurement of Wood Properties by Using Near-Infrared Laser Radiation Reviewed

    "Tsuchikawa, S., Takahashi, T. and Tsutsumi, S."

    Forest Products Journal   Vol. 50   page: 81-86   2000.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  431. Nondestructive measurement of wood properties by using near-infrared laser radiation Reviewed

    Tsuchikawa S, Takahashi T, Tsutsumi S

    FOREST PRODUCTS JOURNAL   Vol. 50 ( 1 ) page: 81 - 86   2000.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  432. Non-traditional application of NIRS to detect physical and chemical conditions of biological materials Invited Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Recent Research Developments in Applied Spectroscopy   Vol. 3   page: 113-134 - 134   2000.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  433. Nondestructive measurement of wood properties by using near-infrared laser radiation Reviewed

    S Tsuchikawa, T Takahashi, S Tsutsumi

    FOREST PRODUCTS JOURNAL   Vol. 50 ( 1 ) page: 81 - 86   2000.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:FOREST PRODUCTS SOC  

    This study deals with the construction of a practical nondestructive measurement system with a semiconductor near-infrared laser, by which some information at the deeper position of a sample could be measured more correctly than that by the traditional spectrophotometer. A series of experiments was carried out by giving attention to some geometric conditions of illumination (incident angle, etc.), physical conditions (sample thickness, direction of fiber, etc.), and moisture content (MC). It was revealed that the transmitted output power, Pt, varied characteristically with the combination of geometric conditions of illumination and physical conditions of a sample. The measurable sample thickness substantially exceeded the spectrophotometer with low output power. Pt increased with increasing MC. In particular, we could readily measure Pt for thicker samples involving free water, whereas it was hardly detected in the air-dried condition. The elimination of the air spaces in wood by free water was associated with the reduction of light scattering, so that much more energy would be transmitted. The near-infrared laser system will undoubtedly exhibit good performance for the nondestructive measurement of large wood articles.

    Web of Science

  434. Nondestructive measurement of wood properties by using near-infrared laser radiation Reviewed

    Tsuchikawa S., Takahashi T., Tsutsumi S.

    Forest Products Journal   Vol. 50 ( 1 ) page: 81 - 86   2000.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Forest Products Journal  

    This study deals with the construction of a practical nondestructive measurement system with a semiconductor near-infrared laser, by which some information at the deeper position of a sample could be measured more correctly than that by the traditional spectrophotometer. A series of experiments was carried out by giving attention to some geometric conditions of illumination (incident angle, etc.), physical conditions (sample thickness, direction of fiber, etc.), and moisture content (MC). It was revealed that the transmitted output power, Pt, varied characteristically with the combination of geometric conditions of illumination and physical conditions of a sample. The measurable sample thickness substantially exceeded the spectrophotometer with low output power. Pt increased with increasing MC. In particular, we., could readily measure Pt for thicker samples involving free water, whereas it was hardly detected in the air-dried condition. The elimination of the air spaces in wood by free water was associated with the reduction of light scattering, so that much more energy would be transmitted. The near-infrared laser system will undoubtedly exhibit good performance for the nondestructive measurement of large wood articles.

    Scopus

  435. Analytical characterization of reflected and transmitted light from cellular structural material for the parallel beam of NIR incident light

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 53 ( 9 ) page: 1033 - 1039   1999.9

     More details

  436. Analytical characterization of reflected and transmitted light from cellular structural material for the parallel beam of NIR incident light Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 53 ( 9 ) page: 1033 - 1039   1999.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The results of several studies show clearly that the behavior of light transmitted in wood samples is considerably different from that of an ideal scattering medium. These observations suggest that the Kubelka-Munk theory (the K-M theory) cannot be applied directly to biological material with a cellular structure. We have developed new concepts to understand the optical characteristics of a sample having cellular structure for the illumination condition of the available spectrometers. Through a series of examinations, it became clear that the behavior of diffusely reflected light in wood was accurately described by the K-M theory. However, the behavior of its transmitted light was considerably different from that of an ideal scattering medium under the conditions of Lambert's cosine law. A two-component model of the diffusion process with respect to a parallel beam component of incident light was considered. Furthermore, the nth power cosine model of radiant intensity was introduced to be fitted for the actual state of the radiation in wood. On the basis of these optical models, the mean optical pathlength through the sample was calculated, which allowed the concept of the equivalent sample thickness to be derived. Over and above these considerations, generalized input/output equations for radiation were constructed by introducing the equivalent sample thickness into K-M equations. The absorbance calculated by such concepts agreed well with the experimental values.

    DOI: 10.1366/0003702991948026

    Scopus

  437. Directional characteristics model and light-path model for biological material having cellular structure

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 53 ( 2 ) page: 233 - 240   1999.2

     More details

  438. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 53 ( 2 ) page: 233 - 240   1999.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Nondestructive measurements, based on NIRS (near-infrared spectroscopy), on biological material having cellular structure, such as wood, require a nontraditional approach. In this respect, a truly nondestructive measurement system that can accurately monitor the physical condition and chemical components of materials is very desirable. Supported by a series of experiments, we constructed optical characteristic concepts that account for the cellular structure of a sample. The system was successfully modeled by following theoretically the sequential propagation of light in a sample (specifically, scattering, reflection, absorption, and transmission), which varies according to the angle of the fibers with respect to the direction of incident light, θ, and with its wavelength. A set of optical models, which consists of a directional characteristics model and a light-path model, has been developed to describe the various steps in the sequence. On the basis of these models, the leakage ratios of diffusely reflected light from the aggregate width of semi-infinite tracheids, S(θ), for various conditions of irradiation were calculated. These values were in good agreement with the actual values obtained from the measured values of absorbance through the judicious use of a semi-theoretical equation.

    DOI: 10.1366/0003702991946370

    Scopus

  439. Optical models of biological materials to develop non-traditional NIR analysis Invited Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Recent Research Developments in Applied Spectroscopy   Vol. 2   page: 1-18   1999.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  440. Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light Reviewed

    "Tsuchikawa, S. and Tsutsumi, S."

    Applied Spectroscopy   Vol. 53   page: 1033-1039   1999.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  441. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    "Tsuchikawa, S. and Tsutsumi, S."

    Applied Spectroscopy   Vol. 53   page: 233-240   1999.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  442. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Applied Spectroscopy   Vol. 53   page: 233-240   1999.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  443. Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Applied Spectroscopy   Vol. 53   page: 1033-1039   1999.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  444. Optical models of biological materials to develop non-traditional NIR analysis Invited Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Recent Research Developments in Applied Spectroscopy   Vol. 2   page: 1-18   1999.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  445. Non-traditional applications of NIRS based on the optical characteristic models for a biological material having cellular structure. Reviewed

    "Tsuchikawa, S.,"

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 41-46   1998.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  446. Directional characteristics of near-infrared light in the process of radiation a transmission from wood. Reviewed

    "Tsuchikawa, S., Torii, M., and Tsutsumi, S.,"

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 47-53   1998.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  447. Adsorptive a capillary coensed water in biological material. Reviewed

    "Tsuchikawa, S, and Tsutsumi, S.,"

    Journal of Materials Science Letters   Vol. 17   page: 661-663   1998.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  448. Adsorptive and capillary condensed water in biological material

    Tsuchikawa S, Tsutsumi S

    JOURNAL OF MATERIALS SCIENCE LETTERS   Vol. 17 ( 8 ) page: 661 - 663   1998

     More details

  449. Directional characteristics of near infrared light in the process of radiation and transmission from wood Reviewed

    S Tsuchikawa, M Torii, S Tsutsumi

    JOURNAL OF NEAR INFRARED SPECTROSCOPY, VOL 6 1998   Vol. 6   page: 47 - 53   1998

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:NIR PUBLICATIONS  

    In this report, a newly designed apparatus, that is, a near infrared auto-goniophotometer, was introduced to acquire detailed optical information about biological material having a cellular structure like wood, Such information allows us to analyse the three-dimensional physical condition of a sample and confirm the suitability of proposed optical models. The directional characteristics could be found on the basis of the intensity of reflected or transmitted light at each observation angle,In these experiments, Sitka spruce (Picea sitchensis Carr,) with various thicknesses were used. Results of these measurements showed the directional characteristics which were affected significantly by the illumination conditions and sample thickness. Particularly, these varied characteristically with the wavelength of the incident light. This result supports the validity of the proposed optical models which vary with wavelength. Throughout these analyses, the relationships between the physical aspects of a sample and the emitted light from it is being clarified.

    Web of Science

  450. Adsorptive and capillary condensed water in biological material Reviewed

    S Tsuchikawa, S Tsutsumi

    JOURNAL OF MATERIALS SCIENCE LETTERS   Vol. 17 ( 8 ) page: 661 - 663   1998

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:KLUWER ACADEMIC PUBL  

    Web of Science

  451. Adsorptive and capillary condensed water in biological material Reviewed

    Tsuchikawa S., Tsutsumi S.

    Journal of Materials Science Letters   Vol. 17 ( 8 ) page: 661 - 663   1998

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Materials Science Letters  

    DOI: 10.1023/A:1006672324163

    Scopus

  452. Non-traditional applications of near infrared spectroscopy based on the optical characteristic models for a biological material having cellular structure Reviewed

    Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 6 ( 1-4 ) page: 41 - 46   1998

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Non-destructive measurements, based on near infrared (NIR) spectroscopy, on biological material with a cellular structure like wood require a non-traditional approach. We have developed new concepts to model the optical properties of a sample having cellular structure, for the illumination conditions of the spectrometer available to us. A set of optical models, which consisted of the directional characteristics models, the light-path models and the equivalent surface roughness model was proposed to clarify the behaviour of light propagation in a wood sample. Furthermore, the mean optical path length, which was derived by incorporating the nth power cosine model of radiant intensity into the diffusion process model in consideration of the parallel beam component of incident light, was calculated. By introducing the concept of equivalent sample thickness, compatible with the mean optical path length, into the Kubelka-Munk theory, generalised input/output equations for radiation were constructed. In this non-traditional application of NIR spectroscopy, these optical concepts make it possible to analyse both the physical condition and chemical composition of a biological material with a cellular structure.

    DOI: 10.1255/jnirs.119

    Scopus

  453. Directional characteristics of near infrared light in the process of radiation and transmission from wood Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Journal of Near Infrared Spectroscopy   Vol. 6 ( 1-4 ) page: 47 - 53   1998

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    In this report, a newly designed apparatus, that is, a near infrared auto-goniophotometer, was introduced to acquire detailed optical information about biological material having a cellular structure like wood. Such information allows us to analyse the three-dimensional physical condition of a sample and confirm the suitability of proposed optical models. The directional characteristics could be found on the basis of the intensity of reflected or transmitted light at each observation angle. In these experiments, Sitka spruce (Picea sitchensis Carr.) with various thicknesses were used. Results of these measurements showed the directional characteristics which were affected significantly by the illumination conditions and sample thickness. Particularly, these varied characteristically with the wavelength of the incident light. This result supports the validity of the proposed optical models which vary with wavelength. Throughout these analyses, the relationships between the physical aspects of a sample and the emitted light from it is being clarified.

    DOI: 10.1255/jnirs.120

    Scopus

  454. Non-traditional applications of near infrared spectroscopy based on the optical characteristic models for a biological material having cellular structure Reviewed

    S Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY, VOL 6 1998   Vol. 6   page: 41 - 46   1998

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:NIR PUBLICATIONS  

    Non-destructive measurements, based on near infrared (NIR) spectroscopy, on biological material with a cellular structure like wood require a non-traditional approach. We have developed new concepts to model the optical properties of a sample having cellular structure, for the illumination conditions of the spectrometer available to us. A set of optical models, which consisted of the directional characteristics models, the light-path models and the equivalent surface roughness model was proposed to clarify the behaviour of light propagation in a wood sample, Furthermore, the mean optical path length, which was derived by incorporating the n(th) power cosine model of radiant intensity into the diffusion process model in consideration of the parallel beam component of incident light, was calculated. By introducing the concept of equivalent sample thickness, compatible with the mean optical path length, into the Kubelka-Munk theory, generalised input/output equations for radiation were constructed. In this nontraditional application of NIR spectroscopy, these optical concepts make it possible to analyse both the physical condition and chemical composition of a biological material with a cellular structure.

    Web of Science

  455. Application of near infrared spectrophotometry to wood V. Calibration equations for physical conditions of wood Reviewed

    Tsuchikawa S., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 43 ( 2 ) page: 149 - 158   1997.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This paper is aimed at the non-destructive quantitative assessment of the physical conditions in bulky wood by near infrared spectrophotometry (NIRS). The calibration equations for the angles of the fibers to the direction of the incident light, θ, and the maximum height of surface roughness, R′y, were determined by a multiple linear regression analysis based on the NIR reflectance spectra. By taking the optical models into account, some sophisticated procedures to meet the situations are proposed, and the prediction error of these criterion variables are discussed. The results are summarized as follows. (1) The calibration equation for predicting θ performs enough to avoid the effect of surface roughness when the explanatory variable is selected suitably in the range of I (800-1400 nm). (2) After distinguishing whether θ is smaller or greater than 45° by the calibration equation for θ, θ is predicted accurately by suitably changing the partial regression coefficients. (3) The calibration equation for R′y is influenced characteristically by the combination of θ and wavelength λ of the explanatory valiables. R′y is predicted successfully by the partial regression coefficients corresponding to each local range of R′y. (4) For the normal measurement of NIR spectra, it is difficult to find a significant calibration equation for R′y at θ≧55°. Then, the absorbance may be measured by using a neutral density (ND) filter contacting the surface of the sample to capture more reflected light originating from the sub-surface structure.

    Scopus

  456. Application of near infrared spectrophotometry to wood. V Reviewed

    TSUCHIKAWA S

    Mokuzai Gakkaishi   Vol. 43 ( 2 ) page: 149 - 158   1997.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  457. Application of Near Infrared Spectrophotometry to Wood V. Calibration equations for physical conditions of wood

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 43 ( 2 ) page: 149 - 158   1997.2

  458. Application of Near Infrared Spectrophotometry to Wood V. Calibration equations for physical conditions of wood Reviewed

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 43 ( 2 ) page: 149 - 158   1997.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Research

  459. 近赤外分光法による木材の非破壊計測(第5報)-試料の物理的構成に関する情報の検量線

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 43   page: 149-158   1997.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  460. 近赤外分光法による木材の非破壊計測(第5報)-試料の物理的構成に関する情報の検量線 Reviewed

    土川 覚, 堤 成晃

    木材学会誌   Vol. 43   page: 149-158   1997.1

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  461. Application of near infrared spectrophotometry to wood .5. Calibration equations for physical conditions of wood Reviewed

    Tsuchikawa, S; Tsutsumi, S

    MOKUZAI GAKKAISHI   Vol. 43 ( 2 ) page: 149 - 158   1997

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  462. Application of near infrared spectrophotometry to wood .5. Calibration equations for physical conditions of wood Reviewed

    Tsuchikawa S, Tsutsumi S

    MOKUZAI GAKKAISHI   Vol. 43 ( 2 ) page: 149 - 158   1997

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  463. Application of near infrared spectrophotometry to wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light Reviewed

    Tsuchikawa S., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 4 ) page: 343 - 353   1996.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    A series of experiments were made to apply Near Infrared Spectrophotometry (NIRS) to a non-destructive analytical method for wood. In this study, not only the determination of the compositions of materials, but also the acquirement of information relating to the physical aspects of them must be considered. Therefore, it is important to systematize the sequential propagation of light in wood, specifically, scattering, reflection, absorption, and transmission, which vary with the angles of the fibers to the directions of incident light, θ, and its wavelengths. In this study, a set of optical models, which consisted of directional characteristics models of light and light-path models, are proposed to clarify the behavior of light propagation in wood. For these models, the wood is taken as an aggregate of tracheids. The results are summarized as follows : (1) The behavior of light scattering in wood falls into three bands of the wavelengths of near infrared rays according to the trend of the absorption coefficient, K, and the scattering coefficient, S. (2) The directional characteristics models of diffusely reflected light and transmitted light, for which the aspects of K and S in three bands were taken into consideration, were proposed. (3) The light path model, which expresses the situation in regard to the emitted light from the aggregate-width of semi-infinite tracheids, is proposed. It can be found from the superposition of the light paths of diffusely reflected light at an arbitrarily chosen cell wall of semi-infinite tracheids. (4) The leakage ratio of diffusely reflected light from the aggregate-width of semi-infinite tracheids, S(θ), for various conditions of irradiation was calculated based on the optical models. These values were in good agreement with S(θ) found from the measurement value of absorbance and a second empirical equation. 2) (5) These results support theoretically the application of NIRS to a non-destructive analytical method for wood, which has some internal structure and definite order.

    Scopus

  464. Application of near infrared spectrophotometry to wood IV.: Calibration equations for moisture content Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 8 ) page: 743 - 754   1996.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This paper is aimed at the nondestructive quantitative assessment of the moisture condition in bulky wood by using near infrared spectrophotometry (NIRS). In the first stage of a series of experiments, the effect of moisture condition on the minimum sample thickness in which light was diffuse-reflected sufficiently, d0, was investigated. Secondly, the calibration equations for moisture conditions of some species having homogeneous water distributions; moisture contents in percents (MC), and per unit volumes (MV), were determined by multiple linear regression analysis based on the NIR reflectance spectra. Furthermore, the prediction error of moisture content for a sample having an inhomogeneous water distribution was found by which the scope of the application for actual moisture conditions in wood was investigated. Similar experiments also were made for the model samples which represented the condition of inhomogeneous water distribution to grasp the effect of water distribution in wood on the prediction error of the calibration equations. The results are summerlized as follows. (1) d0 changes in general with the moisture conditions, and the trend of do with moisture conditions varies with the wavelengths, whereas they arise from the same compounds of water. (2) When the explanatory variables and the number of them are selected suitably for the calibration equations, they perform sufficiently in predicting the moisture conditions independently of the wood species. Especially, in the case of the explanatory variables selected from the 2nd derivative spectra, the prediction error is less than that from the original spectra in both the criterion variables of MC and MV. This is noticeable in the case of the calibration equation for MC. (3) For a sample having an inhomogeneous water distribution, it is important to select the wavelengths suitably as the explanatory variables in consideration of the minimum sample thickness in which light is sufficiently diffuse-reflected. (4) A model experiment was made in which the stepwise distribution of moisture content was given to the test pieces. The thickness of the surface-side part in a sample and the difference of moisture contents between the surface-side part and the back-side part in a sample govern the predicted values of the moisture contents and the features of which are made clear.

    Scopus

  465. Application of near infrared spectrophotometry to wood III.: Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

    Tsuchikawa S., Tsursumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 8 ) page: 733 - 742   1996.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This study deals with the optical problems that arise when a parallel beam of near infrared light irradiates a sample with a cellular structure like wood. The behavior of reflected and transmitted light is explained by optical characteristic models of advanced expression based on the Kubelka-Munk theory. Through a series of experiments and examinations, it became clear that the behavior of transmitted light in wood was considerably different from that of an ideal scattering medium under the conditions of Lambert's cosine law. On the other hand, the behavior of diffusely reflected light in wood can be described by the Kubelka-Munk theory. Then, the diffusion process model in consideration of the component of a parallel beam of light was considered. Furthermore, the radiant condition of wood is described flexibly by the nth power cosine model of radiant intensity. Based on these optical characteristic models, the mean optical path length through the sample was calculated from which the concept of the equivalent thickness of the sample was derived. Over and above these, the generalized input/output equations for radiation were constructed by introducing the equivalent thickness of the sample into Kubelka-Munk's equations. The absorbance calculated by the generalized input/output equations for radiation agreed well with the experimental values. This result suggests that the behavior of near infrared light in wood can be described by them. The radiant intensity characteristics of the transmitted light varied with the conditions of light absorption in the near infrared Bands II and III (1400-2500 nm), and the scattering components perpendicular to the direction of incident light increased monotonically with decreasing wavelength in the Band I (800-1400 nm). For the nondestructive measurement of wood by near infrared spectrophotometry, it is very important to find the optimum conditions by considering the optical geometry of the apparatus, the wavelength of light, and the light scattering conditions in the sample.

    Scopus

  466. Application of near infrared spectrophotometry to wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light Reviewed

    Tsuchikawa S, Tsutsumi S

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 4 ) page: 343 - 353   1996.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    A series of experiments were made to apply Near Infrared Spectrophotometry (NIRS) to a non-destructive analytical method for wood. In this study, not only the determination of the compositions of materials, but also the acquirement of information relating to the physical aspects of them must be considered. Therefore, it is important to systematize the sequential propagation of light in wood, specifically, scattering, reflection, absorption, and transmission, which vary with the angles of the fibers to the directions of incident light, θ, and its wavelengths. In this study, a set of optical models, which consisted of directional characteristics models of light and light-path models, are proposed to clarify the behavior of light propagation in wood. For these models, the wood is taken as an aggregate of tracheids. The results are summarized as follows : (1) The behavior of light scattering in wood falls into three bands of the wavelengths of near infrared rays according to the trend of the absorption coefficient, K, and the scattering coefficient, S. (2) The directional characteristics models of diffusely reflected light and transmitted light, for which the aspects of K and S in three bands were taken into consideration, were proposed. (3) The light path model, which expresses the situation in regard to the emitted light from the aggregate-width of semi-infinite tracheids, is proposed. It can be found from the superposition of the light paths of diffusely reflected light at an arbitrarily chosen cell wall of semi-infinite tracheids. (4) The leakage ratio of diffusely reflected light from the aggregate-width of semi-infinite tracheids, S(θ), for various conditions of irradiation was calculated based on the optical models. These values were in good agreement with S(θ) found from the measurement value of absorbance and a second empirical equation. 2) (5) These results support theoretically the application of NIRS to a non-destructive analytical method for wood, which has some internal structure and definite order.

  467. Application of near infrared spectrophotometry to wood III.: Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

    Tsuchikawa S, Tsursumi S

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 8 ) page: 733 - 742   1996.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This study deals with the optical problems that arise when a parallel beam of near infrared light irradiates a sample with a cellular structure like wood. The behavior of reflected and transmitted light is explained by optical characteristic models of advanced expression based on the Kubelka-Munk theory. Through a series of experiments and examinations, it became clear that the behavior of transmitted light in wood was considerably different from that of an ideal scattering medium under the conditions of Lambert's cosine law. On the other hand, the behavior of diffusely reflected light in wood can be described by the Kubelka-Munk theory. Then, the diffusion process model in consideration of the component of a parallel beam of light was considered. Furthermore, the radiant condition of wood is described flexibly by the nth power cosine model of radiant intensity. Based on these optical characteristic models, the mean optical path length through the sample was calculated from which the concept of the equivalent thickness of the sample was derived. Over and above these, the generalized input/output equations for radiation were constructed by introducing the equivalent thickness of the sample into Kubelka-Munk's equations. The absorbance calculated by the generalized input/output equations for radiation agreed well with the experimental values. This result suggests that the behavior of near infrared light in wood can be described by them. The radiant intensity characteristics of the transmitted light varied with the conditions of light absorption in the near infrared Bands II and III (1400-2500 nm), and the scattering components perpendicular to the direction of incident light increased monotonically with decreasing wavelength in the Band I (800-1400 nm). For the nondestructive measurement of wood by near infrared spectrophotometry, it is very important to find the optimum conditions by considering the optical geometry of the apparatus, the wavelength of light, and the light scattering conditions in the sample.

  468. Near-infrared spectroscopy

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

  469. Nondestructive measurement of the subsurface structure of biological material having cellular structure by using near-infrared spectroscopy Reviewed

    Tsuchikawa S., Hayashi K., Tsutsumi S.

    Applied Spectroscopy   Vol. 50 ( 9 ) page: 1117 - 1123   1996.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Biological materials - wood is a typical example - are widely used in a state where not only the cellular structure but also its bulky shape is retained. NIRS (near-infrared spectroscopy) may be called for as a promising technique to analyze the physical state of such materials as well as the chemical composition. In this report, the effects of physical conditions found in wood on the absorption of NIR radiation are examined. In the experiments, conifers (Sitka spruce) that had various degrees of surface roughness and different orientations of fibers to the direction of incident light were used. Results of these measurements showed that the orientation of fibers and the surface roughness of wood were directly related to the absorbance. In addition, it became clear that the behavior of diffusely reflected light in wood could be expressed by Kubelka-Munk theory and fell into three categories according to the characteristic of the absorption and scattering coefficient. On the basis of these results, a new concept for the behavior of NIR light passing through material made of hollow fibers has been proposed.

    DOI: 10.1366/0003702963905114

    Scopus

  470. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  471. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  472. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  473. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  474. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  475. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  476. Near-infrared spectroscopy Reviewed

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  477. 近赤外分光法による木材の非破壊計測 (第4報) 含有水分に関する検量線

    土川 覚, 鳥居 美里, 堤 成晃

    木材学会誌   Vol. 42 ( 8 ) page: 743 - 754   1996.8

     More details

    Publisher:日本木材学会  

  478. Application of Near Infrared Spectrophotometry to Wood III. Behavior of reflected and transmitted light for parallel beam of incident light

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 8 ) page: 733 - 742   1996.8

  479. Application of Near Infrared Spectrophotometry to Wood III. Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 8 ) page: 733 - 742   1996.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Research

  480. 近赤外分光法による木材の非破壊計測 (第4報) 含有水分に関する検量線 Reviewed

    TSUCHIKAWA Satoru, TORII Misato, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 8 ) page: 743 - 754   1996.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    CiNii Research

  481. Application of Near Infrared Spectrophotometry to Wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 4 ) page: 343 - 353   1996.4

  482. Application of Near Infrared Spectrophotometry to Wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light Reviewed

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 4 ) page: 343 - 353   1996.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Research

  483. Noestructive Measurement of the Subsurface Structure of Biological Material Having Cellular Structure by Using Near-Infrared Spectroscopy. Reviewed

    "Tsuchikawa, S., Hayashi, K., and Tsutsumi, S.,"

    Applied Spectroscopy   Vol. 50   page: 1117-1124   1996.1

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  484. 近赤外分光法による木材の非破壊計測(第4報)-含有水分に関する検量線 Reviewed

    "土川 覚, 鳥居美里, 堤 成晃,"

    木材学会誌   Vol. 42   page: 743-754   1996.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  485. 近赤外分光法による木材の非破壊計測(第3報)-平行入射光に関する反射光および透過光の挙動 Reviewed

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 42   page: 733-742   1996.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  486. 近赤外分光法による木材の非破壊計測(第2報)-近赤外照射光の仮道管群における挙動と拡散反射・透過指向特性 Reviewed

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 42   page: 343-353   1996.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  487. Noestructive Measurement of the Subsurface Structure of Biological Material Having Cellular Structure by Using Near-Infrared Spectroscopy. Reviewed

    Tsuchikawa, S, Hayashi, K, Tsutsumi, S

    Applied Spectroscopy   Vol. 50   page: 1117-1124   1996.1

     More detai