IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 110, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • Measurements and Errors
    Hiroyuki Hirayama
    1990 Volume 110 Issue 5 Pages 295-301
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_295
    JOURNAL FREE ACCESS
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  • Temporal and Spatial Resolved Measurements of the Emission of High-Frequency Silent Discharge
    Masaki Kuzumoto, Shigenori Yagi
    1990 Volume 110 Issue 5 Pages 302-308
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_302
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    Temporal and spatial resolved measurements of the emission of high-frequency silent-discharge are carried out. The discharge is used for exciting CO2 lasers, in which the frequency of the applied voltage is around 100kHz, the gap length and gas pressure are several tens of mm and Torr, respectively. The emission lines are found to be basically those of the 2nd positive group of N2 molecules. The discharge is observed to be taken place in every half cycle of the applied voltage. The emission is originated at the dielectric surface of negative electrode and penetrates into plasma. A high luminous region is observed near the dielectric surface of negative electrode. Time variation of the emission is found to be qualitatively explained considering the quasi-steady-state electron energy distribution which is determined from instantaneous electric field strengh.
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  • CO2 Arc Welding with Double Pulse Current
    Shigeo Ueguri, Yoichiro Tabata, Masanori Mizuno, Yoshihiro Ueda
    1990 Volume 110 Issue 5 Pages 309-316
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_309
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    CO2 arc welding is widely accepted since a high current density in the process assures a high reliability in the welding and CO2 gas is cheap in comparison to Ar and other shielding gases. But it has a drawback in the spattering that is brought about by short-circuiting of welding wire and base metal. This paper is aimed to determine an optimum current waveform that suppresses the spattering. With the optimization, the droplet produced at the tip of the welding wire is transfered from the wire toward the base metal without short-circuiting. The way a droplet is transfered has been investigated with various kinds of pulse current waveforms by taking high-speed framing pictures.
    The results are as follows:
    (1) The repetitive application of double pulse current is suitable to transfer the droplet regularly without short-circuiting. With the pulse current, the droplet falls off before it grow too large.
    (2) The droplet transfer is reproducible in every cycle of the double pulse current as far as the voltage across the arc is maintained constant at the starting-point of the pulse.
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  • A Calculation Method of the Mutual and Self Inductances Generated by Currents on a Cylinder
    Kiyoshi Yoda
    1990 Volume 110 Issue 5 Pages 317-320
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_317
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    Conventional calculation methods of air-core inductance utilized Neumann's equation for solenoidal coils and Fourier series for saddle coils. However inductance formulas for arbitrarily shaped coils on a cylinder have not been well known.
    In this paper, mutual and self inductances generated by any currents on a cylinder are expressed using Fourier-Bessel expansion of the vector potential. An experiment shows the validity of the proposed formulas.
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  • Observation of Electric Field Distribution between a Hemisphere and a Plate Electrode by the Photography Showing Electric Field
    Masaru Nakamura, Osamu Yamamoto, Muneaki Hayashi
    1990 Volume 110 Issue 5 Pages 321-329
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_321
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    The authors have proposed the fogging photography showing electric field strength, as a new method of recording the image of electric field distribution on the photographic film. If a photographic film has been exposed to a light flash synchronized with application of electric field, the optical density of the developed film is decreased correspondingly to the applied field strength. Based on this phenomenon, a photographic film was inserted between a hemisphere and a plate where it contact each other, a fogging photograph showing electric field distribution was photographed. The density decrease distributions of the developed films were measured, and they were compared with the distributions of the calculated electric field. In consequence, it was elucidated that optical density distribution of the developed film correnpond nearly calculated electric field distribution in the emulsion layer, within the limits of the arrangement method which emulsion layer had been contacted with plate elertrode.
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  • A Peculiarity of Surface Charge Distribution on a Magnetic Body with Symmetry of Revolution
    Masanori Kobayashi
    1990 Volume 110 Issue 5 Pages 330
    Published: May 20, 1990
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.110.5_330
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