Faculty Profiles - TSUCHIKAWA, Satoru

Papers - TSUCHIKAWA, Satoru

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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

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

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

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

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

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

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

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

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

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

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

Application of near infrared spectrophotometry to wood .2. 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 Vol. 42 ( 4 ) page： 343 - 353 1996

Application of near infrared spectrophotometry to wood .4. Calibration equations for moisture content Reviewed

Tsuchikawa, S; Torii, M; Tsutsumi, S

MOKUZAI GAKKAISHI Vol. 42 ( 8 ) page： 743 - 754 1996

Application of near infrared spectrophotometry to wood .3. Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

Tsuchikawa, S; Tsutsumi, S

MOKUZAI GAKKAISHI Vol. 42 ( 8 ) page： 733 - 742 1996

Tsuchikawa S, Tsutsumi S

MOKUZAI GAKKAISHI Vol. 42 ( 4 ) page： 343 - 353 1996

Application of near infrared spectrophotometry to wood .4. Calibration equations for moisture content Reviewed

Tsuchikawa S, Torii M, Tsutsumi S

MOKUZAI GAKKAISHI Vol. 42 ( 8 ) page： 743 - 754 1996

Application of near infrared spectrophotometry to wood .3. Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

Tsuchikawa S, Tsutsumi S

MOKUZAI GAKKAISHI Vol. 42 ( 8 ) page： 733 - 742 1996

Application of near infrared spectrophotometry to wood .4. Calibration equations for moisture content Reviewed

Tsuchikawa S, Torii M, Tsutsumi S

MOKUZAI GAKKAISHI Vol. 42 ( 8 ) page： 743 - 754 1996

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.

Vibration Characteristics of a Rotating Circular Saw V. Effects of number of teeth and slots on vibration and radiated sound. Reviewed

MOKUZAI GAKKAISHI Vol. 40 ( 12 ) page： 148 1994

VIBRATION CHARACTERISTICS OF A ROTATING CIRCULAR-SAW .5. EFFECTS OF NUMBER OF TEETH AND SLOTS ON VIBRATION AND RADIATED SOUND Reviewed

H YOKOCHI, S KIMURA, S TUCHIKAWA

MOKUZAI GAKKAISHI Vol. 40 ( 2 ) page： 148 - 157 1994

Language：English Publishing type：Research paper (scientific journal) Publisher：JAPAN WOOD RES SOC

Aerodynamically induced sound and the sound radiated from the resonating blade of an idling circular saw rotating at high speed were investigated experimentally.
The vortex groups were divided according to the Strouhal number and the number of the vortex groups depended on the number of teeth, while the circular saws without slot were not resonating.
The relationships between the rotation speeds and the aerodynamic sound pressures were divided into two groups. One group had 40 and 60 teeth, and the other group had 80 and 100 teeth. For the former, the stable vortex shedding generated because the gullets were large, and then the aerodynamic sounds were large. However, they became small while the saws were resonating. For the latter, the aerodynamic sounds were small while saws were not resonating, and they became very large while they were resonating. Aerodynamic sounds were the largest while saw with slots was resonating under the 8 nodal diameter and the slots antinodal vibration mode.
It was considered that the frequencies of vortex shedding locked-in the natural frequencies of the circular saws, and the vortex shedding at each saw tooth must synchronize with the traveling wave of a single vibration mode or a coupled vibration mode of the saws. Then, for the circular saws with the 40 teeth, the vortex shedding synchronized uneasily with the traveling wave, and the amplitudes of vibrations were small.
The radiation efficiency of circular saw blades is the ratio of sound energy to vibration energy. The radiation efficiency of the standing wave was greater than that of the forward traveling wave. That of the forward traveling wave was greater than that of the backward traveling wave.

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