研究者詳細 - 土川　覚

論文 - 土川　覚

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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 頁： 123 - + 2006年

Low atmospheric temperature dependence on photo degradation of wood 査読有り

Mitsui, K; Tsuchikawa, S

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 81 巻 ( 2 ) 頁： 84 - 88 2005年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Photochemistry and Photobiology B: Biology

This paper deals with the photodegradation of wood in low atmospheric temperature region (-40 to 50 °C), and discusses the changes in color and IR spectra. The color and IR spectra of wood hardly changed with photo-irradiation at -40 °C but did at -20 °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. © 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jphotobiol.2005.05.011

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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 51 巻 ( 2 ) 頁： 167 - 171 2005年4月

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 査読有り

TERDWONGWORAKUL Anupun, PUNSUWAN Vittaya, THANAPASE Warunee, TSUCHIKAWA Satoru

Journal of Wood Science 51 巻 ( 2 ) 頁： 167 - 171 2005年4月

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 59 巻 ( 1 ) 頁： 86 - 93 2005年1月

Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation. 査読有り

Tsuchikawa S, Hirashima Y, Sasaki Y, Ando K

Applied spectroscopy 59 巻 ( 1 ) 頁： 86 - 93 2005年1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

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

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Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation 査読有り

Tsuchikawa, S, Hirashima, Y, Sasaki, Y, Ando, K

Applied Spectroscopy 59 巻 ( 1 ) 頁： 86 - 93 2005年1月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

本論文では、木材の強度特性を支配する諸因子を分光学的に非破壊で推定することを試み、系統的な実験とケモメトリックス的な解析によって密度、縦弾性係数および引張応力が高精度で推定可能となることを明らかにした。また、その理論的根拠を明らかにすることによって、新しい測定手法としての基盤を形成することに成功した。

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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 査読有り

Terdwongworakul, A.; Punsuwan, V.; Thanapase, W.; Tsuchikawa, S.

Journal of Wood Science 51 巻頁： 167-171 2005年

*Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method 査読有り

Tsuchikawa, S.; Yonenobu, H.; Siesler, H. W.

The Analyst 130 巻頁： 379-384 2005年

Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments 査読有り

Wu Y.Q.; Tsuchikawa S.; Hayashi K.

Journal of Near Infrared Spectroscopy 13 巻頁： 371-376 2005年

Low atmospheric temperature dependence on photodegradation of wood 査読有り

Mitsui, K.; Tsuchikawa S.

Journal of Photochemistry and Photobiology B: Biology 81 巻頁： 84-88 2005年

Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation 査読有り

Tsuchikawa, S.; Hirashima, Y.; Sasaki, Y.; Ando, K.

Applied Spectroscopy 59 巻 ( 1 ) 頁： 78-85 2005年

Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method. 査読有り

土川覚

The Analyst. 130 頁： 379 - 384 2005年

*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 130 巻頁： 379-384 2005年

Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments 査読有り

Wu Y.Q., Tsuchikawa S., Hayashi K.

Journal of Near Infrared Spectroscopy 13 巻 ( 6 ) 頁： 371 - 376 2005年

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：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

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Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments 査読有り

Wu Y.Q, Tsuchikawa S, Hayashi K

Journal of Near Infrared Spectroscopy 13 巻 ( 6 ) 頁： 371 - 376 2005年

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 13 巻 ( 6 ) 頁： 371 - 376 2005年

Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method 査読有り

Tsuchikawa S, Yonenobu H, Siesler HW

ANALYST 130 巻 ( 3 ) 頁： 379 - 384 2005年

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：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

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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 51 巻頁： 167-171 2005年

Terdwongworakul A, Punsuwan V, Thanapase W, Tsuchikawa S

JOURNAL OF WOOD SCIENCE 51 巻 ( 2 ) 頁： 167 - 171 2005年

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：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

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