研究者詳細 - 土川　覚

論文 - 土川　覚

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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

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 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

Web of Science

Scopus

Near-Infrared Spectroscopic Study of the Physical and Mechanical Properties of Wood with Meso-and Micro-Scate Anatomical Observation. 査読有り

土川覚

Applied Spectroscopy 59・1 頁： 86 - 93 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 Study of the Physical and Mechanical Propertics of Wood with Meso- and Micro-Scale Anatomical Observation 査読有り

土川覚

Applied Spectroscopy 59・1 頁： 86 - 93 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

土川覚

Applied Spectroscopy 59・1 頁： 86 - 93 2005年

Spectroscopic monitoring of wood characteristics variation by light-irradiation 査読有り

Tsuchikawa, S; Inoue, K; Mitsui, K

FOREST PRODUCTS JOURNAL 54 巻 ( 11 ) 頁： 71 - 76 2004年11月

Spectroscopic monitoring of wood characteristics variation by light-irradiation 査読有り

Tsuchikawa S., Inoue K., Mitsui K.

Forest Products Journal 54 巻 ( 11 ) 頁： 71 - 76 2004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：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

Wood photography using light irradiation and heat treatment 査読有り

Mitsui, K; Murata, A; Tsuchikawa, S; Kohara, M

COLOR RESEARCH AND APPLICATION 29 巻 ( 4 ) 頁： 312 - 316 2004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：Color Research and Application

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. ΔE* 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 Δb*. 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 ΔE* after thermal treatment was about 22. Humans can distinguish four to seven colors that can be created by this method. © 2004 Wiley Periodicals, Inc.

DOI： 10.1002/col.20027

Web of Science

Scopus

Application of time-of-flight near infrared spectroscopy for detecting sugar and acid contents in apples 査読有り

Tsuchikawa S, Hamada T

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 52 巻 ( 9 ) 頁： 2434 - 2439 2004年5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：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

近赤外分光法を用いた新しい非破壊年代測定法の開発(第16回名古屋大学タンデトロン加速器質量分析計シンポジウム平成15(2003)年度報告)

米延仁志, 土川覚, 小田寛貴, Siesler Heinz W.

名古屋大学加速器質量分析計業績報告書 ( 15 ) 頁： 74 - 82 2004年3月

出版者・発行元：名古屋大学年代測定資料研究センター

第16回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成15年(2003年度)報告 Proceedings of the 16th Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2003 日時:平成16(2004)年1月22日(木)､23日(金) 会場:名古屋大学シンポジオン Date:January 22nd and 23rd,2004 Place:Nagoya University Symposion Hall

DOI： 10.18999/sumrua.15.74

Spectroscopic Monitoring of Wood Characteristics Variation by Light-Irradiation 査読有り

"Tsuchikawa, S.; Inoue, K.; Mitsui K."

Forest Products Journal 54 巻頁： 71-76 2004年1月