Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
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Volume 24, Issue 10
Displaying 1-7 of 7 articles from this issue
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  • Electronic Fringe Measurement of Interferometer
    Ziro TUZI, Susumu NAMBA
    1955 Volume 24 Issue 10 Pages 397-410
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.397
    JOURNAL FREE ACCESS
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  • Several Surface Reactions on Stibnite Cleavage Face
    Ryoitiro SATO
    1955 Volume 24 Issue 10 Pages 413-416
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.413
    JOURNAL FREE ACCESS
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    The electron diffraction investigation of the surface reactions involved in the flotation of sphalerite (ZnS) has been extended to the case of stibnite (Sb2S3). It has been confirmed that in some cases aqueous copper sulphate reacts with stibnite cleavage face to produce well developed crystallites of sulphides of copper (CuS and Cu1.8S), although in other cases an unidentified reaction product is also obtained. When the surface reaction product consists of very minute crystallites or is of amorphous nature, the action of aqueous xanthate thereupon leads to the formation of cuprous xanthate. The structure of the surface film of this cuprous xanthate coincides with that formed by the action of xanthate on sphalerite cleavage face activated beforehand by copper sulphate.
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  • A Study on the Transformation by Life Test of Secondary Electron Emitting Surfaces by Electron Diffraction Method
    Kazumasa ONO
    1955 Volume 24 Issue 10 Pages 416-421
    Published: October 10, 1955
    Released on J-STAGE: February 20, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.416
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    Transformation by life test of secondary-electron emitting surfaces of 2.5% Mg-Ag and 1.5% Be-Cu alloys are studied by means of electron diffraction. Oxidation products MgO and BeO which covered the activated surfaces are found to have been removed considerably from the surfaces after the test which reduced the secondary emission yield from initial values 4_??_7 to 2_??_4. It is also found that the oxide removed from the surfaces is deposited on the surfaces of nickel plates placed to face the emitting surfaces; the nickel plates produce diffraction pattern corresponding to MgO and Mg-metal in the case of 2.5% Mg-Ag and that composed of two halos coinciding with the strong Debye rings appropriate for BeO in the case of 1.5% Be-Cu. The substantial changes of the surfaces are considered to be the main cause of the damage of the secondary emission surfaces.
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  • Study on a New Type Electrometer
    Takao ORITA, Teruichi TOMURA, Gunji SHINODA
    1955 Volume 24 Issue 10 Pages 421-426
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.421
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    A new type electrometer, which has a very small effective capacitance, is described. Electrometer of this type was first devised by Y. L. Yousef and R. Kamel. By analysis and experiment, improvement has been made by adding a special damping electrode, amplifying the output and using a negative feed-back. Effective input capacitance of the order of 10-3 pf can be easily obtained. With this electrometer, a static potential distribution in space is measured with a moderately fast response comparable to an ordinary panel meter and a small current is measured with a detectability of 10-17 Amp. within a few minutes.
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  • Orientation Determination of Cubic Crystal Plates by the Light-Figure Method
    Mikio YAMAMOTO, Jirô WATANABÉ
    1955 Volume 24 Issue 10 Pages 427-432
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.427
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    Accurate and rapid determination of determination of orientations of cubic crystal plates and, particularly, strips by the light-figure method has been worked out. Full accounts are given of the procedure for the determination, of the kind and number of applicable light figures or of accurately determinable orientation angles, of the stereographic representation of orientations, and of the accuracy in orientation determination with reference to actual examples of iron and silicon iron strip crystals.
    The kind and number of applicable light figures or of accurately determinable orientation angles depend on the crystal orientation to be determined, of which the relationship indicates that the perfect orientation determination can be made for most crystals for which the orientations of the plate normal lie close to the [100], [110] or [111] axes. It is shown that orientations of single crystal strips of pure iron and silicon iron can be determined with an accuracy well within 0.5° by this method.
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  • 1R5 for Electrometer-tube
    Masayoshi KANEKO
    1955 Volume 24 Issue 10 Pages 433-434
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.433
    JOURNAL FREE ACCESS
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  • Static Electricity Viewed from Safety Engineering
    Tetsuzo KITAGAWA
    1955 Volume 24 Issue 10 Pages 435-441
    Published: October 10, 1955
    Released on J-STAGE: February 09, 2009
    DOIhttps://doi.org/10.11470/oubutsu1932.24.435
    JOURNAL FREE ACCESS
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