Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 8, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • The Automatic Measurement Method for Elastic Constants and Internal Friction of Small Specimens
    Kazuyuki Hirao, Kazuyuki Okano, Naohiro Soga
    1981 Volume 8 Issue 2 Pages 47-51
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.47
    JOURNAL FREE ACCESS
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    An automatic system for measuring elastic constants and internal friction on glasses and ceramics as a function of temperature was constructed by employing the concept of the cube resonance method. The system consists of a mini-computer, a frequency synthesizer, a transducer, a digital voltmeter and a plotter, all of which are connected with bas line. It can send a receiver any signal from 100Hz to 20MHz with a resolution of 1mHz. The measuring was made on several cube and a parallel piped on-shaped specimens of 1∼5mm size, and the resultant spectra for silica glass were analyzed by a newly made computer program to obtain elastic constants and internal friction. The results agreed well with those given in a literature, independent of specimen size. An internal friction for silica glass was varied as a function of water content.
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  • The Excess Enthalpies of Polarizable Nonpolar and Dipolar Solutions
    Katsutoshi Tamura, Sachio Murakami, Ryoichi Fujishiro
    1981 Volume 8 Issue 2 Pages 52-56
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.52
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    The corresponding state theory modified for polar solutions is applied to the excess enthalpies of binary mixtures of aromatic hydrocarbons and aliphatic ketones. The dispersion interaction parameter X12 between aromatic hydrocarbon and cyclohexanone is estimated from excess enthalpies of methylcyclohexane mixtures of corresponding aromatic hydrocarbon in which methylcyclohexane is nonpolar homologue to cyclohexanone, and heptane is used as nonpolar homologue to diethyl ketone and methyl ethyl ketone. For the parameter of dipole-dipole interaction m, the value proposed by Winnick, 1.75×108, is used. The dipole-induced dipole interaction parameter m' of mixtures of aromatic hydrocarbon and ketone are estimated by using these X12 and m parameters from excess enthalpies of mixture. The parameter m' increases in the sequence benzene > toluene > ethyl benzene. The contributions of each interaction to excess enthalpy are also estimated.
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  • Thermal Properties of Water in Bacillus cereus Spores and Vegetative Cells
    Yoshimi Maeda, Shozo Koga
    1981 Volume 8 Issue 2 Pages 57-61
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.57
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    Bacillus cereus spores have an extremely high heat resistivity as compared to their vegetative form. The thermal behavior of the cell water was studied with special regard to these properties characteristic of the spores. The phase diagrams for both cell forms were obtained by single scannings with a differential scanning calorimeter. The intracellular water was divided into freezable and unfreezable fractions, the amount of which could be determined calorimetrically for both cell forms. The amount of freezable water was lower in the spores than in the vegetative cells. This fact seems to be important for the maintenance of the dormancy and heat resistivity of the spores. The unfreezable water content was slightly lower in the spores than in the vegetative forms.
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  • Improvements on Laser-Flash, Thermal Diffusivity Measurement (I)
    A New Isoperibol Type Apparatus and Heat-Loss Correction
    Yoichi Takahashi, Tadahiko Azumi, Masayoshi Kanno
    1981 Volume 8 Issue 2 Pages 62-66
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.62
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    A new laser-flash apparatus for thermal diffusivity measurement from 300 to 1500K is described. In this apparatus the sample is surrounded by an isoperibol heat sink made of tantalum, which diminishes heat loss from the sample by radiation at high temperatures. The temperature of the sample is sensed by an infrared detector or alternatively by a thermocouple, whereas that of the heat sink is detected by a thermocouple. An improved method of correction for heat leak is also presented employing a parameter kt1/2, where k is the relaxation constant of the heat-loss curve and t1/2 is the half rise time to reach the maximum temperature. These values can be experimentally determined and the proposed method provides a convenient and useful way in the correction for the heat loss from the sample. As an example, the thermal diffusivity data on tantalum with the correction for the heat loss are presented and are compared with the available data.
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  • Critical Solution Temperatures in Cellulose Diacetate-Acetone Solutions
    Hidematsu Suzuki, Kichizo Ohno, Kenji Kamide, Yukio Miyazaki
    1981 Volume 8 Issue 2 Pages 67-70
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.67
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    Thermodynamic properties of acetone solutions of cellulose diacetate (a degree of substitution, DS=2.46) were examined by means of solution stability experiments over the wide range of temperature. The solutions were separated into two-phase at elevated temperatures of around 170°C, the lower critical solution temperature having been determined. On the other hand, no phase separation was observed at low temperatures. The latter observation is not in accord with a published result on similar materials. A theoretical consideration is given to substantiate the observed phenomenon.
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  • Reactivity of Oxide-Powders formed by Thermal Decomposition
    Influences of Preparation Histories on the Reactivity and Application of Thermal Analysis
    Tadao Ishii
    1981 Volume 8 Issue 2 Pages 71-80
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.71
    JOURNAL FREE ACCESS
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    The reaction behaviors of oxide-powders, MgO, Al2O3, CaO, BaO, TiO2, Fe2O3, UO2 and V2O5, which were formed by thermal decomposition of salts or hydrates, were examined in the various reaction systems, and summarized in connection with the preparation histories of the powders.
    In many cases, the reactivity of powders was greatly influenced by their heat treatment histories, and closely correlated with a phase-boundary reaction at the initial reaction step. For the search of the surface behaviors occurred at transition stage before the attainment of steady state of the reaction, the useful applications of thermal analysis were done as a non-isothermal technique which differs essentially from a conventional isothermal method.
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  • Guidance of the thermal property measurements for beginners
    (1) Thermodilatometry
    A. Kishi
    1981 Volume 8 Issue 2 Pages 81-88
    Published: May 10, 1981
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.8.81
    JOURNAL FREE ACCESS
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