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Volume 23 (2009)
- Issue 4 Pages 197-
- Issue 3 Pages 148-
- Issue 2 Pages 98-
- Issue 1 Pages 14-
Volume 23, Issue 1
Displaying 1-3 of 3 articles from this issue
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Katsuyuki TANAKA, Takuya YASUNO, Yukihiro HIGASHI, Shunichi OKUZAKI, T ...2009 Volume 23 Issue 1 Pages 14-20
Published: February 28, 2009
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSThe temperature-change sensor by thermoelectric module jointed directly p type element and n type element was developed. β-FeSi2 thermoelectric semiconductor made by spark plasma sintering method was used for the prototype sensor. Evaluation of this thermoelectric temperature-change sensor was carried out by measuring electromotive force on dropping into the isothermal water bath. It is confirmed that there is a correlation between temperature difference and electromotive force of the sensor, about 5mV of electromotive force was generated by 30 K of temperature difference. Additionally, dependence of electromotive force on size and thermophysical properties of thermoelectric elements was evaluated by FEM analysis.View full abstractDownload PDF (532K) -
Seiichi Hagiwara, Etsuo Sakai, Hiroshi Sato, Kiyoshi Asaga2009 Volume 23 Issue 1 Pages 21-26
Published: February 28, 2009
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSGenerally, a crack in concrete occurs by strain due to difference in thermal expansion between at the central part of the concrete and at the surface of it, and such a difference is brought from the rapid generation of heat of hydration of cement in hardening process. Then, the measurement of temperature elevation in concrete by adiabatic process is important and which is required to the quality control of it. In order to carry out the measurement of temperature elevation with higher precision and with fewer sample of concrete than those of previous one, a precision thermo controller and an improved thermostat chamber for the adiabatic calorimeter have been designed and constructed in this study. In the performance test using test piece of non-reactive material, linear temperature elevation was observed during electrical heating and which was maintained as the same temperature after stop of heating. Reproducibility and linearity in temperature elevation were estimated to be less than 0.2K and 0.5%, respectively. Adiabatic performance was believed within 0.05Kday-1.View full abstractDownload PDF (327K) -
Development of Correlation Equation Using Experimental VariableDaisuke Tomida, Tsumugi Konishi, Takeo Ebina, Tomomichi Nishino, Chiak ...2009 Volume 23 Issue 1 Pages 27-31
Published: February 28, 2009
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSQuantitative structure-activity relationship (QSAR) correlations were developed for the solubility of organic compounds in supercritical CO2 at (308K, 20MPa) and (328K, 12.7MPa). To identify the molecular structural variables that control solvation phenomena, we first developed the QSAR correlation of solubility of 32 organic compounds in supercritical CO2 at (308K, 20MPa) using experimentally and theoretically derivable variables. The experimental variable used was the melting point, and the theoretical variables were molecular orbital basicity and dipole moment. The latter were determined using COSMO-PM3 method. Based on the results at (308K, 20MPa), the QSAR correlation for solubility in supercritical CO2 at (328K, 12.7MPa) was determined from the solubility data for 16 other compounds in the literature. The QSAR correlation including the melting point and dipole moment as variables dramatically improved the accuracy of the predicted solubility of organic compounds in supercritical CO2.View full abstractDownload PDF (301K)
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