Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 33, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Magnetocaloric Effect and Magnetic Refrigerant Materials
    Hirofumi Wada
    2006 Volume 33 Issue 3 Pages 98-103
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.98
    JOURNAL FREE ACCESS
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    Magnetic refrigeration is expected to be a future technology because of its energy efficiency and environmental safety. The concept of magnetic refrigeration is based on the magnetocaloric effects. In this article, we first review magnetocaloric effects and recent development of magnetic refrigerators. Then, we report the giant magnetocaloric effects of MnAs1-xSbx, which were recently discovered by our group. It is found that a first-order magnetic transition from a ferromagnetic state to a paramagnetic state is responsible for giant magnetocaloric effects in this system. Finally, the prospect of magnetic refrigerant materials at room temperature will be given.
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  • Calorimetry and Macromolecular Interaction Arising from Translational Motion of Solvent Molecules
    Ryo Akiyama, Yasuhito Karino, Masahiro Kinoshita
    2006 Volume 33 Issue 3 Pages 104-113
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.104
    JOURNAL FREE ACCESS
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    We give comments on the interaction between macromolecules such as proteins immersed in aqueous solution. The translational motion of solvent molecules makes a large contribution to the dimerization free energy of macromolecules. The conventional theory of osmotic pressure for discussing the cosolute effect is applicable only to limited phenomena. We suggest phenomenological equations which incorporate the contribution from the translational motion of solvent molecules. At the same time, the problems of those equations are pointed out on the basis of the results from an elaborate statistical-mechanical theory. A calorimetrical approach for molecular recognition and structure formation of nano-materials is also discussed.
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  • Calorimetric/PVT Investigations of the Interactions in Polymer/Gas Systems under High Pressures
    Séverine A. E. Boyer
    2006 Volume 33 Issue 3 Pages 114-126
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.114
    JOURNAL FREE ACCESS
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    Materials selection is usually made according to their thermophysical and structural properties. To provide a useful guide to the utilization of materials in a given set of conditions (temperature T, pressure P and pressurizing conditions), PVT-Controlled scanning calorimetry named scanning transitiometry permits to well document phase diagrams. The type and extent of {polymer/gas} interactions as well as thermophysical properties are obtained from thermal and mechanical measurements resulting from the methodology controlling precisely the temperature and pressure. Scanning transitiometry permits to scan one of the independent variables (P, V, or T) while the other independent variable is kept constant. Simultaneous change of the dependent variable is recorded together with the associated thermal effect. The effect of pressure on the thermophysical properties, especially using carbon dioxide as a pressurizing fluid, is investigated along two types of runs. Pressure-Controlled Scanning Calorimetry (PCSC) run is employed to determine the global cubic thermal expansion coefficients of semicrystalline polymers in interaction with a fluid. Temperature-Controlled Scanning Calorimetry (TCSC) run is employed to investigate the isotropic transitions of amphiphilic liquid crystalline di-block copolymers under a pressurizing fluid. These polymers play an essential role as regards the safety of transport of petroleum products and are promising candidates as templates for microelectronics and biotechnology.
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  • Revision of Japanese Industrial Standard of General Rule on Thermal Analysis
    Tatsuko Hatakeyama
    2006 Volume 33 Issue 3 Pages 127-133
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.127
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    Japanese Industrial Standard of “General Rule of Thermal Analysis” (JIS K0129; 1994) established in 1994 has been used as a basic rule among fourteen thermal analysis JIS's specified for plastics, metals and ceramics. Revision of the general rule has been requested by industrial domains in order to catch up the development attained during these 12 years. The major revision was mainly carried out in the following points: (1) terms of thermal analysis were harmonized with newly established terminology, (2) dynamic mechanical analysis was added, (3) variety of attached apparatus was increased, (4) conformation of apparatuses was illustrated accommodating to computer aided systems, and (5) the section describing quality control of data was newly added. JIS K0129; 1994 was revised and authorized as JIS K0129; 2005.
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  • [title in Japanese]
    2006 Volume 33 Issue 3 Pages 134-135
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.134
    JOURNAL FREE ACCESS
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  • Group Combustion Behaviors in Spray Flames
    F. Akamatsu
    2006 Volume 33 Issue 3 Pages 136-138
    Published: June 15, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.136
    JOURNAL FREE ACCESS
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