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Volume 10 (1996)
- Issue 4 Pages 96-
- Issue 2-3 Pages 48-
- Issue 1 Pages 10-
Volume 10, Issue 1
Displaying 1-4 of 4 articles from this issue
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Akira Ohnishi, Toshio Hatada, Tomonao Hayashi1996 Volume 10 Issue 1 Pages 10-15
Published: January 31, 1996
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSAn onboard simultaneous measuring method of solar absorptance αS and total hemispherical emittance εH of thermal control materials for spacecraft is proposed. The principle of this measurement is based on a calorimetric method utilizing solar radiation and electrical heat input through a sheet heater attached to the sample. This method allows to determine αS and εH simultaneously by using different level of input power to the sample heater, and for the data reduction, there is no need to use the values of parameters, such as the mass or the specific heat of the sample materials.
Laboratory experiment of simultaneous method consists of a vacuum chamber made of Al-alloy, vacuum pumps and a solar simulator with a Xe lamp. The vacuum chamber has a shroud cooled by liquid nitrogen. The test sample is suspended at the center of the vacuum chamber and introduced the light beam normal to the sample from a solar simulator. The results obtained by this method agree well with other results by the spectroscopic method and calorimetric method.View full abstractDownload PDF (1246K) -
Daisuke Kodama, Nobuo Kubota, Yoshikazu Yamaki, Hiroyuki Tanaka, Masah ...1996 Volume 10 Issue 1 Pages 16-20
Published: January 31, 1996
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSHigh pressure vapor-liquid equilibria and saturated densities are measured for carbon dioxide+methanol system at 313.15K, without any analysis of phase compositions, based on mass balance and the phase rule. Unsaturated densities are further measured. The saturated points near the critical point of mixture are measured by the conventional dew-bubble point pressure method. A technique is presented to determine the saturated vapor points, assuming the linear relation between molar volume and mole fraction. The experimental data obtained are correlated with equations of state.View full abstractDownload PDF (958K) -
Eisyun Takegoshi, Yoshio Hirasawa, Syoshin Hoyo, Motoaki Takebe, Shige ...1996 Volume 10 Issue 1 Pages 21-26
Published: January 31, 1996
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSThermal constants (thermal diffusivity, specific heat, thermal conductivity, linear thermal expansion, coefficient of linear thermal expansion) of Al2O3-SiC-ZrO2-TiC composites were measured in the range of room temperature to 700°C by the laser flash method and push-rod dilatometer method. Six kinds of specimens were made by changing the content rate of TiC. The temperature dependence on the thermal constants of these specimens were investigated and the results were indicated in Figs. 3-12.View full abstractDownload PDF (1159K) -
Akihiro SAKOGUCHI, Ryuichi UEOKA, Yasuo KATO, Yasuhiko ARAI1996 Volume 10 Issue 1 Pages 27-32
Published: January 31, 1996
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSIn this work, a predictive method to calculate vapor pressures of coal-derived compounds based on the information of molecular structures was proposed.
Five constants in the vapor pressure equation (Abrams-Massaldi-Prausnitz (AMP) equation) are described by three parameters S, Eo/R and Vw. The hard core van der Waals volume Vw was calculated by the Bondi's group-contribution method.
The molecular connectivity χ is one of the useful topological parameters to represent the differences of molecular structures. Parameters S and Eo/R are correlated by molecular connectivity and number of skeletal atoms. Therefore, the parameters in the vapor pressure equation can be obtained by the molecular connectivity χ, number of skeletal atoms N and van der Waals volume Vw.
The absolute average deviation in correlation of 3336 vapor pressure data points of 129 coal-derived compounds is 11%.View full abstractDownload PDF (998K)
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