研究者詳細 - 土川　覚

論文 - 土川　覚

分割表示 537 件中 421 - 440 件目／全件表示 >>

Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment 査読有り

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

Journal of Near Infrared Spectroscopy 11 巻 ( 5 ) 頁： 401 - 405 2003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

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

Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment 査読有り

Tsuchikawa S, Murata A, Kohara M, Mitsui K

JOURNAL OF NEAR INFRARED SPECTROSCOPY 11 巻 ( 5 ) 頁： 401 - 405 2003年

Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls 査読有り

Yonenobu H., Tsuchikawa S., Oda H.

Journal of Near Infrared Spectroscopy 11 巻 ( 5 ) 頁： 407 - 411 2003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

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

Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy 査読有り

Tsuchikawa S., Yamato K.

Journal of Near Infrared Spectroscopy 11 巻 ( 5 ) 頁： 391 - 399 2003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

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

Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls 査読有り

H Yonenobu, S Tsuchikawa, H Oda

JOURNAL OF NEAR INFRARED SPECTROSCOPY 11 巻 ( 5 ) 頁： 407 - 411 2003年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：N I R PUBLICATIONS

Web of Science

Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment 査読有り

S Tsuchikawa, A Murata, M Kohara, K Mitsui

JOURNAL OF NEAR INFRARED SPECTROSCOPY 11 巻 ( 5 ) 頁： 401 - 405 2003年

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）出版者・発行元：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

光照射-熱処理による木材の強度変化査読有り

小原光博, 三井勝也, 村田明宏, 土川覚

岐阜大学教育学部研究報告自然科学 28 巻 ( 1 ) 頁： 61 - 63 2003年

光照射-熱処理による木材表面への画像転写査読有り

小原光博, 三井勝也, 村田明宏, 土川覚

岐阜大学教育学部研究報告自然科学 28 巻 ( 1 ) 頁： 57 - 60 2003年

Application of time-of-flight near infrared spectroscopy to wood with anisotropic cellular structure. 査読有り

"Tsuchikawa, S.; Tsutsumi, S."

Aplied Spectroscopy 56 巻頁： 869-876 2002年7月

Application of time-of-flight near-infrared Spectroscopy to wood with anisotropic cellular structure

Tsuchikawa S, Tsutsumi S

APPLIED SPECTROSCOPY 56 巻 ( 7 ) 頁： 869 - 876 2002年7月

Application of time-of-flight near-infrared Spectroscopy to wood with anisotropic cellular structure 査読有り

S Tsuchikawa, S Tsutsumi

APPLIED SPECTROSCOPY 56 巻 ( 7 ) 頁： 869 - 876 2002年7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）出版者・発行元：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

Application of time-of-flight near-infrared spectroscopy to wood with anisotropic cellular structure 査読有り

Tsuchikawa S., Tsutsumi S.

Applied Spectroscopy 56 巻 ( 7 ) 頁： 869 - 876 2002年7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：Applied Spectroscopy

DOI： 10.1366/000370202760171545

Scopus

Application of time-of-flight near-infrared spectroscopy for detecting water core in apples. 査読有り

"Tsuchikawa, S.; Kumada, S.; Inoue, K.; Cho, R."

Journal of American Society of Horticultural Science 127 巻頁： 303-308 2002年3月

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 127 巻 ( 2 ) 頁： 303 - 308 2002年3月

Application of time-of-flight near-infrared spectroscopy for detecting water core in apples 査読有り

S Tsuchikawa, S Kumada, K Inoue, RK Cho

JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE 127 巻 ( 2 ) 頁： 303 - 308 2002年3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）出版者・発行元：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

Application of near infrared spectroscopy to wood discrimination. 査読有り

"Tsuchikawa, S.; Inoue, K.; Noma, J.; Hayashi, K."

Journal of Wood Science 49 巻頁： 29-35 2002年1月

Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure 査読有り

TSUCHIKAWA Satoru

Analytical Sciences/Supplements 17icas 巻 ( 0 ) 頁： i463 - i466 2002年

Application of time-of-flight near-infrared spectroscopy for detecting water core in apples 査読有り

Tsuchikawa S., Kumada S., Inoue K., Cho R.K.

Journal of the American Society for Horticultural Science 127 巻 ( 2 ) 頁： 303 - 308 2002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 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

Directional characteristics of near infrared light reflected from wood 査読有り

Tsuchikawa S., Torii M., Tsutsumi S.

Holzforschung 55 巻 ( 5 ) 頁： 534 - 540 2001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：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

Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure 招待有り査読有り

Tsuchikawa S.

Analytical Sciences 17 巻頁： 463-466 2001年10月

　前のページ - 次のページ　

<土川 覚>

論文 - 土川 覚

<土川　覚>

論文 - 土川　覚