TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Volume 5, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Thermal Power Generation using LNG as Fuel
    Tetsuo TAKEUCHI
    1970 Volume 5 Issue 3 Pages 125-134
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.125
    JOURNAL FREE ACCESS
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    Since January, 1970, LNG (Liquefied Natural Gas) has been used in Minami Yokohama Power Station of the Tokyo Electric Power Co. as the fuel of steam power generation.
    It is the first trial in the world that electric power is generated by use of LNG. This essay deals with technical features in using LNG for power generation, as well as those of marine transportation and regasification of LNG.
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  • Studies on Fundamental Design of Cryogenic Helium Heat Exchanger
    Masami YAMAGUCHI, Hideki TOGAWA
    1970 Volume 5 Issue 3 Pages 135-146
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.135
    JOURNAL FREE ACCESS
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    In order to facilitate the design of heat exchangers used at cryogenic temperature, a numerical method was tried to heat exchangers of a 4°K helium refrigerator.
    Experiment of the helium refrigerator showed that this calculation satisfied prediction of heat transfer area above 10°K. For J-T heat exchanger below 10°K, this calculation was helpful for approaching near to the suitable value, although some correction of heat transfer area was necessary.
    With reference to literatures of Collins, Starr, Nagano and others, several numerical methods are also reviewed and compared with the method of this report.
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  • Leak Rate of Helium Gas through a Clearance at Low Temperature
    Masami YAMAGUCHI, Hiroshi HOSHINO
    1970 Volume 5 Issue 3 Pages 147-156
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.147
    JOURNAL FREE ACCESS
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    Leak rate of helium was measumed in labyrinthine clearance 11 or 13μ of an Collinstype expansion engine in 36mm diameter, under the pressure difference of 20kg/cm2. Temperature coefficient of leak rate by theoretical calculation was in good coincidence with the observed value. Therefore the affect of the leak rate to refrigeration capacity of engine can be evaluated at 20-280°K. A comment on Doll's report is also presented.
    Leak rate of helium at a valve sheet made of leather or TEFLON was measured at 30-280°K under the pressure difference of 15kg/cm2 and a theoretical equation was derived.
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  • Superconductivity of Nb-Ti-Si Alloy
    Fumihiko ISHIDA, Toshio Doi, Yoshimichi AIYAMA, Sakutarô TOMIYAM ...
    1970 Volume 5 Issue 3 Pages 157-163
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.157
    JOURNAL FREE ACCESS
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    The effect of the addition of Si to Nb-60at.%Ti alloy on the critical current density in the transverse magnetic field was investigated. The critical current density of Nb-60at.%Ti alloy aged at temperatures ranging from 350 to 550°C increases markedly with the addition of 0.5-2at.%Si. The α-precipitates as pinning points of flux lines become finer and dispersed more uniformly with the addition of Si, thus leading to the increase in the critical current density. By means of the aging at 500°C for 3hr after the cold-drawing of 98.4% reduction, the critical current density of Nb-58at.%Ti-2at.%Si alloy reached the maximum value of 6.0×104A/cm2 at 70 kOe.
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  • High Pressure Experiment under Low Temperature
    G. FUJII, H. NAGANO
    1970 Volume 5 Issue 3 Pages 164-172
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.164
    JOURNAL FREE ACCESS
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  • Superconducting Materials
    T. YAMASHITA
    1970 Volume 5 Issue 3 Pages 173-175
    Published: June 20, 1970
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.5.173
    JOURNAL FREE ACCESS
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