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Volume 9 (1982)
- Issue 4 Pages 135-
- Issue 3 Pages 89-
- Issue 2 Pages 53-
- Issue 1 Pages 2-
Volume 9, Issue 3
Displaying 1-5 of 5 articles from this issue
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Akira Kishi, Kiyoshi Saito, Masahiko Ichihashi1982 Volume 9 Issue 3 Pages 89-95
Published: August 10, 1982
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSA new calorimetric thermobalance has been developed by combining a thermobalance, a conduction-type calorimeter and an infrared image furnace. Using this new apparatus, the simultaneous thermogravimetry and heat change measurement can be made from room temperature up to 1170K with high accuracy and by simple operation.
In principle, a specimen in a platinum cell is heated in such a manner that a constant temperature difference exists at all times between the specimen and the outer nickel box while the temperature of the outer box is precisely controlled by the infrared image furnace and a temperature controller. The time required for the specimen temperature to increase by 1, 2, 5 or 10K is measured by the calorimetric circuit, and is digitally recorded along with the specimen temperature and the weight change.
The new apparatus which is designed to maintain the specimen temperature nearly constant during the reaction has made it possible to identify each stage in the dehydration process of multihydrates such as CuSO4·5H2O and MgSO4·7H2O. This apparatus is superior to the conventional TG-DTA or TG-DSC simultaneous analyzer in terms of the accuracy of calorimetry, and the resolution of reaction. The measurement accuracy of specific heat, heat of transition and heat of fusion is within ±3∼5% for pure substances such as Zn, KNO3 and SiO2.View full abstractDownload PDF (1488K) -
Teiji Kato1982 Volume 9 Issue 3 Pages 96-98
Published: August 10, 1982
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSA well temperature-controlled Thermally Stimulated Depolarization Current (TSDC) apparatus is constructed. The structure of electrodes and the assembly of the measuring-chamber are shown and explained. The direct welding of a sheath micro-heater and a cooling pipe to one of the electrodes permits excellent control of sample temperature at heating, cooling and isothermal processes. The high performance of the apparatus is demonstrated by showing a result of TSDC measurement of an aromatic polycarbonate.View full abstractDownload PDF (443K) -
Theoretical and Thermodynamic ApproachesYasuhiko Kondo1982 Volume 9 Issue 3 Pages 99-108
Published: August 10, 1982
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThere are some very striking similarities between equilibrium and kinetics of reactions, including temperature effects, salt effects, and rate-equilibrium relationships. Transition state theory provides a basis for understanding these similarities. The various roles of the solvents in chemical reactions have been made clear by extending the theory.
Sometimes the reaction in solution indicates a quite complex behavior. A thermodynamic approach which includes a splitting of the change in activation parameters into contributions from the initial and the transition states, is invaluable for a detailed understanding of molecular processes in solution. Recent works by the author have been presented as an example.View full abstractDownload PDF (1210K) -
(II) Thermal Energy Storage TechnologyTakeo Ozawa1982 Volume 9 Issue 3 Pages 109-123
Published: August 10, 1982
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (1818K) -
Sadao Takagi1982 Volume 9 Issue 3 Pages 124-131
Published: August 10, 1982
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (1001K)
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