研究者詳細 - 土川　覚

論文 - 土川　覚

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Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy 査読有り

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

10th World Conference on Timber Engineering 2008 1 巻頁： 239 - 245 2008年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：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.

Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood 査読有り

Inagaki, T.; Mitsui, K.; Tsuchikawa S.

Applied Spectroscopy 62 巻 ( 11 ) 2008年11月

Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood 査読有り

Inagaki, T, Mitsui, K, Tsuchikawa S

Applied Spectroscopy 62 巻 ( 11 ) 頁： 1209 - 1215 2008年11月

Near-infrared spectroscopic investigation of the hydrothermal degradation mechanism of wood as an analogue of archaeological objects. Part I: softwood. 査読有り

Inagaki T, Mitsui K, Tsuchikawa S

Applied spectroscopy 62 巻 ( 11 ) 頁： 1209 - 15 2008年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part I: Softwood 査読有り

Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

APPLIED SPECTROSCOPY 62 巻 ( 11 ) 頁： 1209 - 1215 2008年11月

*Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique 査読有り

Kobori, H.; Yonenobu, H.; Tsuchikawa S.

Applied Spectroscopy 62 巻 ( 8 ) 頁： 854-859 2008年8月

*Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique 査読有り

Kobori, H, Yonenobu, H, Tsuchikawa S

Applied Spectroscopy 62 巻 ( 8 ) 頁： 854 - 859 2008年8月

Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique. 査読有り

Kobori H, Yonenobu H, Noma J, Tsuchikawa S

Applied spectroscopy 62 巻 ( 8 ) 頁： 854 - 9 2008年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

*NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood" 査読有り

Inagaki, T, Yonenobu, H, Tsuchikawa S

Applied Spectroscopy 62 巻 ( 8 ) 頁： 860 - 865 2008年8月

Estimation of sawn face width of Sugi (Cryptomeria japonica D. Don) logs by cross-sectional shape with approximation profile 査読有り

Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

HOLZ ALS ROH-UND WERKSTOFF 66 巻 ( 4 ) 頁： 243 - 247 2008年8月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood. 査読有り

Inagaki T, Yonenobu H, Tsuchikawa S

Applied spectroscopy 62 巻 ( 8 ) 頁： 860 - 5 2008年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood

Inagaki Tetsuya, Yonenobu Hitoshi, Tsuchikawa Satoru

APPLIED SPECTROSCOPY 62 巻 ( 8 ) 頁： 860 - 865 2008年8月

Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique 査読有り

Kobori Hikaru, Yonenobu Hitoshi, Noma Junichi, Tsuchikawa Satoru

APPLIED SPECTROSCOPY 62 巻 ( 8 ) 頁： 854 - 859 2008年8月

Near Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood 査読有り

Tsuchikawa S., Siesler H.

Characterization of the Cellulosic Cell Wall 頁： 123 - 137 2008年4月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Monitoring of hydroxyl groups in wood during heat treatment using NIR spectroscopy 査読有り

Mitsui Katsuya, Inagaki Tetsuya, Tsuchikawa Satoru

BIOMACROMOLECULES 9 巻 ( 1 ) 頁： 286 - 288 2008年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy 査読有り

Mitsui, K.; Inagaki, T.; Tsuchikawa S.

Biomacromolecules 9 巻頁： 286-288 2008年

Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens 査読有り

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

Journal of Near Infrared Spectroscopy 16 巻頁： 529-537 2008年

*NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood" 査読有り

Inagaki, T.; Yonenobu, H.; Tsuchikawa S.

Applied Spectroscopy 62 巻 ( 8 ) 頁： 861-865 2008年

Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile 査読有り

Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

Holz als Roh- und Werkstoff 66 巻 ( 4 ) 頁： 243-247 2008年

*Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple- 査読有り

Kurata, Y.; Ikemoto, Y.; Tsuchikawa S.

Journal of Near Infrared Spectroscopy 16 巻頁： 139-142 2008年

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