TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
Volume 8, Issue 5
Displaying 1-8 of 8 articles from this issue
  • Eizo KANDA
    1973 Volume 8 Issue 5 Pages 173-180
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    Hydrogen is now expected to have great needs as clean fuel and as energy reservation and transportion medium. In connection with this prospect, several researches in physical chemistry and chemical engineering with hydrogen are reviewed which have been done by the author's group in the Cryogenic Laboratory in Tohoku University. Recent researches on some materials concerning the hydrogen problem are also mentioned. Importance of researches and developments in cryogenic engineering with hydrogen is stressed.
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  • Takashi SATOW, Katsuhiko FUKUHARA
    1973 Volume 8 Issue 5 Pages 181-187
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    A theoretical and experimental investigation on thermal runaway phenomena of composite superconductors has been performed. It has been theoretically found that there are two substrate limited currents, a “thermal runaway current” Ih and a “completely stable current” Is, in addition to the take-off current and the recovery current. For a current above Ih the temperature of a composite conductor rises rapidly, and for a current below Is the conductor always recovers to superconducting state no matter how large a disturbance has occurred. The thermal runaway phenomena can be explained by considering the temperature dependences the resistivity of the substrate and heat transfer rate to liquid helium.
    The cornposite comductor tested consists of a copper strip 0.86mm thick by 2.16mm wide on which a copper-clad Ti-Nb-Ta superconducting wire of 0.37mm diameter (core dia.: 0.25mm) is soldered. The test results for the thermal runaway currents agreed well with the predicted. For example, the conductor in an external magnetic field of 43kOe began to runaway thermally at Ih=360A when the temperature reached about 30K. The teermal runaway current may be used as an important standard for designing a metastable superconducting coil.
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  • Yoshio FUKUI
    1973 Volume 8 Issue 5 Pages 188-190
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • Junya YAMAMOTO
    1973 Volume 8 Issue 5 Pages 191-196
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    Apparatuses and some important techniques in the far infrared transmission measurement in low temperatures are described. A superconducting magnet provides magnetic fields up to 50kOe. Inner helium chamber works well for detector cooling. Temperature regulating technique, a vacuum-proof optical window, a needle valve for liquid helium and vibration free system are also discussed.
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  • Y. SAITO
    1973 Volume 8 Issue 5 Pages 197-198
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1973 Volume 8 Issue 5 Pages 199-201
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1973 Volume 8 Issue 5 Pages 202-206
    Published: November 10, 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    Download PDF (703K)
  • 1973 Volume 8 Issue 5 Pages 217
    Published: 1973
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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