Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 7, Issue 12
Displaying 1-5 of 5 articles from this issue
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  • Manufacturing of Met allized Condenser Paper
    Jiro MASUDA
    1964 Volume 7 Issue 12 Pages 389-393
    Published: December 20, 1964
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.7.389
    JOURNAL FREE ACCESS
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  • Glass-bonded Mica
    Toru MATSUSHITA
    1964 Volume 7 Issue 12 Pages 394-398
    Published: December 20, 1964
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.7.394
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1964 Volume 7 Issue 12 Pages 398-399
    Published: December 20, 1964
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.7.398
    JOURNAL FREE ACCESS
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  • Dissolution of Gases in Vacuum Pump Oils
    Noboru SAITO, Tadashi TSUTSUMI
    1964 Volume 7 Issue 12 Pages 400-404
    Published: December 20, 1964
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.7.400
    JOURNAL FREE ACCESS
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    The solubilities of gases in various vacuum pump oils, such as Apiezon-C, Myvane, Octoil-S, Lion-A and Silicon (Heraeus- for ultra high vacuum), have been measured by the gas dissolution method between 20° and 150°C in the pressure range of 10 to 760 Torr. The dependence of solubility on temperature and pressure is given by L=kpn e- Q/RT. When air dissolves in oils, n is nearly equal to unity, but for other gases (H2, O2, N2, Ar) it shows various value from 0. 6 to 1. The temperature coefficients of these solubilities are all positive and heat of dissolution in synthetic oil is lower than in fractional, distilled mineral oil.
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  • Cryosorption Properties of Molecular Sieves in Ultra-High Vacuum Region
    Taichi NOMOTO, Hiroshi ISHII
    1964 Volume 7 Issue 12 Pages 405-410
    Published: December 20, 1964
    Released on J-STAGE: January 28, 2010
    DOIhttps://doi.org/10.3131/jvsj.7.405
    JOURNAL FREE ACCESS
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    In the development of a cryosorption pump being available in ultra-high vacuum, the pumping performances have been experimentally studied for two kinds of molecular sieves, 5A and 13X, at 77°K. The pumping speed has been measured on the adsorbent bed in the sample cell by the constant flow method as a function of time for nitrogen gas in the pressure range of 10-610-8 Torr. The results are as follows :
    (1) Excluding the initial adsorption stage which succeds for a few minutes after introducing the adsorbate gas, the pressure in the cell increases linearly in the square root of time slowly. For this pumping stage, we call “steady pumping stage”.
    (2) The initial pumping speeds of the steady pumping stage for both 5A and 13X are very large and independent of the pressure in the region below 1× 10-6 Torr. However, the speed for 5A depends on. the pressure in the higher region than 10-6 Torr. The decay of speed for 5A is much faster than that for 13X.
    (3) The steady pumping speeds are indepedent of the thickness of the adsorbent bet and in proportion to the apparent area of the adsorbent bed.
    (4) The decay of speeds in case of constant throughput are assumed to depend on the diffusion rate of adsorbed molecules into the adsorbent.
    (5) The optimun condition of baking the molecular sieves is to heat them at 400°C for about 10 hours in high vacuum.
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