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Volume 15 (1988)
- Issue 4 Pages 147-
- Issue 3 Pages 97-
- Issue 2 Pages 59-
- Issue 1 Pages 2-
Volume 15, Issue 3
Displaying 1-6 of 6 articles from this issue
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Hiroshi Yokota, Toshiya Kumagai, Susumu Mizuta1988 Volume 15 Issue 3 Pages 97-102
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSPyrolyses of barium organic acid salts, i. e., caprylate, laurate, stearate and naphthenate, were studied in the temperature range of 25∼600°C in Ar or air flow by thermogravimetry (TG)-differential thermal analysis (DTA), infrared and X-ray analyses. Decomposition reaction of the salts and immediate evaporation of the organic product were found to take place in the range of 400∼500°C in Ar flow, where the pyrolysis temperature was independent of the organic parts of the salts. Pyrolysis in air flow was initiated at much lower temperatures than that in Ar flow, which was attributed to the combustion of organic part of the salts. The pyrolysis product of each salt was found to be BaCO3 both in Ar and air.View full abstractDownload PDF (844K) -
Yoichi Takahashi, Kazutaka Yamamoto, Tetsuo Ohsato1988 Volume 15 Issue 3 Pages 103-109
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESS“Logarithmic method” is a novel method for determining thermal diffusivity in the laser-flash technique. The advantages of logarithmic method over the conventional “t1/2 method” are discussed in this paper.
By solving the one-dimentional thermal diffusion equation using Laplace transformation and term-by-term inversion, we obtain a solution which is useful for early stage of elapsed time. In the logarithmic method, one term approximation of this solution is utilized to determine the thermal diffusivity from the experimental rear-surface temperature history of a sample after being flashed by a laser-pulse. The sensitivity analysis showed the following advantages of this method: The effects of heat leak from the sample and of non-uniform heating by a pulse to the determined thermla diffusivity values are much less in this method than those in case of t1/2 method. This is associated with the fact that the deviation of the maximum temperature rise of a sample from the ideal case affects very little in the determination of thermal diffusivity in this method.
It is concluded that the logarithmic method is much superior to t1/2 method and we propose this method to be used as the standard one for determining thermal diffusivity in the laser-flash technique.View full abstractDownload PDF (1007K) -
Kazuyoshi Takeda1988 Volume 15 Issue 3 Pages 110-119
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThermal and magnetic properties of low-dimensional magnetic systems, such as CuCl2·2H2O, CoCl2·6H2O, TMMC and Mn(HCOO)2·2H2O, have been studied at high pressures and low temperatures. The contents of this review article are
1. Introduction of the calorimetry at high pressures.
2. Experimental method for the calorimetry at high pressures.
3. Pressure dependence of transition temperature and magnetic interaction.
4. Magnetic phase diagram and law of corresponding states at high pressures.
5. Thermal and magnetic observation of a structural transition.
6. Effect of compression on the first and the second order phase transitions.
7. Sharpness of phase transition and its reproducibility on the repeated application of pressure.View full abstractDownload PDF (1206K) -
Sei Miura1988 Volume 15 Issue 3 Pages 120-129
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe relation between pseudoelastic behavior and the thermoelastic martensitic transformation has been studied by means of the measurements of stress-strain curves in the temperature range above and below the martensitic transition temperatures in so called shape memory alloys. Thermodynamical analysis for the pseudoelasticity associated with the stress-induced martensitic transformation have been briefly reviewed and in conjunction with the measurements of latent heat of transformation, the thermoelastic martensitic properties are discussed from a thermodynamic point of view. It was found that using the Clausius-Clapeyron equation concerning the stress-strain relation obtained by the experiments, the entalpy change was calculated and agreed reasonably well with the experimental values. The importance of the measurement of latent heat of transformation was emphasized for the justification of thermodynamical analysis of the pseudoelasticity associated with the stress-induced martensitic transformation in the shape memory alloys.View full abstractDownload PDF (2362K) -
Hatsuho Uedaira1988 Volume 15 Issue 3 Pages 130-142
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSScanning microcalorimetry has a remarkable advantage in the study of protein structure, because it gives all information on the thermodynamic states of proteins as enthalpy function. Owing to the development of scanning microcalorimetry, heat capacity functions for thermal transition of small compact globular proteins, multidomein proteins and multisubunit proteins have been precisely studied. These data have revealed general principles for the thermodynamic properties of ordered structure of small globular proteins and for organizing into large protein molecules. In this paper, recent investigations on the following subjects are reviewed; (1) the experimental studies on small proteins such as neurotoxins, (2) theoretical elucidation of the heat capacity difference between native and denatured states, (3) calorimetric data analysis for multi-domein or multi-subunit proteins, and (4) effects of nonspecific interactions between proteins and additives on the protein structureView full abstractDownload PDF (2008K) -
R. Kinoshita, Y. Nishimoto, Y. Teramoto1988 Volume 15 Issue 3 Pages 143-145
Published: July 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (383K)
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