IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 111, Issue 10
Displaying 1-14 of 14 articles from this issue
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  • Organic Nonlinear Optical Materials and Photonics Devices
    Ken'ichi Kubodera
    1991 Volume 111 Issue 10 Pages 861-867
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_861
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  • Analysis of Low-Frequency Electromagnetic Waves in Plasma Waveguide with Periodic Boundary
    Md. Mortuza Ali, Kazuo Minami, Akira Sugawara
    1991 Volume 111 Issue 10 Pages 868-872
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_868
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    Slow electromagnetic waves (Trivelpiece-Gould Modes) in cylindrical plasma waveguides are analyzed in a case with periodic boundary. Existence of a new mode which has a large number of branches within a finite range of frequencies less than the plasma frequency is predicted. For a simple case, the dispersion relation which approximately satisfies Floquet theorem is analyzed in some detail.
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  • The Effect of Nitrogen Discharge Luminescence on Ozone Synthesis
    Tairo Ito, Kousuke Fujii, Yoshiyasu Ehara, Takao Sakai, Yoshio Miyata, ...
    1991 Volume 111 Issue 10 Pages 873-879
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_873
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    The study was carried out to clear the effects of the only nitrogen discharge luminescence and of the nitrogen discharge luminescence with oxygen silent discharge on ozone synthesis. A coaxial and cylindrical double layer discharge tube was used for ozone synthesis. Nitrogen gas was enclosed in the inner tube, and AC high voltage was applied between the rod electrodes. The oxygen which flowed between the inner and outer tube was irradiated by nitrogen-discharge luminescence, and the amount of ozone was measured.
    Next, the inner tube was rolled by nickel mesh as an electrode and the outer tube was rolled by aluminum foil as an another electrode. The silent discharge were generated in oxygen gas and the discharging oxygen gas was exposed by the nitrogen discharge luminescence.
    The following results were obtained. The amount of ozone generated by the only nitrogen dischage luminescence was a little. And, the amount of ozone generated by the oxygen silent discharge with the irradiation of nitrogen discharge luminescence was more than in the case with the non-irradiation. This result is due to get the effective discharge condition for ozone synthesis owing to irradiate the nitrogen discharge luminescence.
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  • Measurement of Radial Temperature Distribution of Polyethylene Arc Column Using Integrated Emission Coefficient of C2 Band Head Spectra
    Hirofumi Takikawa, Tateki Sakakibara, Mafumi Miyashita, Tadahiro Sakut ...
    1991 Volume 111 Issue 10 Pages 880-887
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_880
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    This paper provides data of temperature distribution of low-current (5-15A) DC arcs burning through polyethylene (PE) tubes (inner diameter: 2, 4mm). First, the emission coefficient of integrated band head spectra (516.5-516.7nm) of C2 molecule Swan system is calculated as a function of temperature. Secondly, the self-absorption of C2 Spectra in the arc is experimentally evaluated using a Xenon lamp located behind the arc. The emission intensity is also measured across the arc. Then, the emission coefficient is calculated through the Abel's inversion method in which the absorption is taken into account. Finally, the radial temperature distribution of the arc is obtained by comparing the measured emission coefficient with the calculated emission coefficient. As a result, the temperature of the arc at off-axis is found to be 2, 500-5, 000K. This is very low compared with the temperatures of wall-stabilized-air-arcs struck under the same conditions. It is also found that the temperature has a tendency to increase as the inner diameter of tube decreases and/or the arc current increases.
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  • Characteristics of Recombination Radiation from Hg-Ar Afterglows
    IV. Time-Resolved Plasma Spectroscopy
    Mikiya Yamane, Nobuyuki Ishida, Kenji Natori
    1991 Volume 111 Issue 10 Pages 888-896
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_888
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    Experiments are described in which the time-dependence of the radiation intensities of Hg 3651A line were recorded after the cut-off of low pressure Hg-Ar discharges. It was found necessary to assume that this afterglow radiation is attributed to the recombination of electrons with molecular ions Hg2+ and HgAr+ The radiation decay time constants obtained from these spectroscopic data indicated that ambipolar diffusion is operative at low pressures, yielding the ambipolar diffusion coefficient DaPAr=3×102cm2s-1 Torr. At high pressures, electron removal is principally by dissociative recombinaions with molecular ions Hg2+ and HgAr+. Conversion of the atomic ions Hg+ to the molecular ions Hg2+ and HgAr+ according to the reactions Hg++Hg+Ar→Hg2++Ar and Hg++2Ar→HgAr++Ar is determined to occur at the rate of k1/PHgPAr=1.7×103s-1 Torr-2 and k2/PAr2=20s-1 Torr-2 respectively.
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  • Transient Boudary Elememt Analysis of Eddy Current Using Eigenmodes with Respect to Time and Space
    Motoo Tanaka, Hajime Tsuboi, Tadashi Naito, Takayoshi Misaki
    1991 Volume 111 Issue 10 Pages 897-903
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_897
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    In this paper, a method for transient eddy current analysis based on boundary element method is presented and a reduction method of boundary element model in transient analysis is investigated. The frequency eigenmodes are used for the integration with respect to time, and spatial eigenmodes are used for the reduction of the boundary element model having spatial symmetries. When accurate eigenvalues and eigenvectors are obtained for the state equations of the computation model, the integration with respect to time can be obtained analytically and accurate computation results are obtained. On the other hand, the reduction method using spatial symmetries is introduced to reduce the computational errors caused by numerical treatment and to reduce the required computer resources: computation time and computer memory storage. The applicability of the reduction method for transient analysis is discussed and verified by using some examples.
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  • Particle Charging of Transition Region of About One Micron in Ion Field
    Takashi Sato, Yoji Nakajima
    1991 Volume 111 Issue 10 Pages 904-908
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_904
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    Experiments on the particle charging in an electric and ion field were carried out with DOP particles around one micron in radius. An empirical particle charge equation is derived from them.
    According to the results of our experiments, the classical field charging theory (hereafter field charging theory) is applicable even to particles about one micron in radius and to a low electric field strength by making a few modifications of it. The modifications are to enlarge the particle size by about 0.2μm and to enhance the applied electric field strength by about 0.4kV/cm. A new and simple charging equation is derived by making the modifications of the field charging equation.
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  • Calculation of Soft X-Ray Output from Neon Plasma of Z-Pinch Devices using a Magnetohydrodynamic Model, Including Radiation Loss
    Yoshio Watanabe, Seiichi Murayama, Hans-P. Stormberg
    1991 Volume 111 Issue 10 Pages 909-915
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_909
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    Dependence on discharge parameters of X-ray output from Z-pinch plasmas of neon has been investigated; a magnetohydrodynamic model is used in which radiation losses are taken into account. The X-ray output is calculated as a function of initial filling gas density, initial radius of discharge column, and charged voltage on the capacitor. When the initial filling gas density is increased, the X-ray output initially increases due to increase in ion number density, peakes and then, decreases due to decrease in electron temperature. The X-ray output at the optimum initial filling gas density peakes at some initial radius of the discharge column at which Z-pinch takes place nearly at the phase of a quarter cycle of the discharge current oscillation. This phase relation gives a maximum efficiency of the coupling between the stored energy in the capacitor and the energy input to the plasma. If the stored energy in the capacitor bank and inductance are kept constant, and if the initial discharge column radius is so adjusted for each charged voltage as to obtain the maximum X-ray output, then the X-ray output increases with increasing charged voltage on the capacitor even if the current peak value is kept constant.
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  • Electrical Treeing Breakdown and Measurement of Space Charge Fields in an LDPE Under a Needle-Plane Electrode System
    Masahiro Fukuzawa, Mitsumasa Iwamoto
    1991 Volume 111 Issue 10 Pages 916-922
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_916
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    In a previous report, we analyzed the characteristics of a space charge field formed in a low density polyethylene (LDPE) film under non-uniform electric fields, and also studied the electrical properties of the film by using thermally stimulated electrical measurement under a needle-plane electrode system. It was found that the electric field formed in an LDPE film near the needle electrode was relaxed by the space charge injected from the needle electrode into film.
    In a present paper, we firstly measured both the inception voltage of treeing and the length of the path generated in an LDPE film by the electrical treeing under a needle-plane electrode system. We then measured both thermally stimulated current (TSC) and thermally stimulated surface potential (TSSP) generated in an LDPE film. After that, we investigated the relationship between the electrical treeing and space charge formed in an LDPE film and the tip of needle electrode used in the present investigation was approximately as same as the length of the path generated by the electrical treeing. Finally, the mechanism of the electrical treeing was also investigated on the basis of our experiments.
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  • Effect of Heat Treatment on Degradation of Zinc Oxide Ceramics after DC Pre-stress
    Hideaki Kawamura, Katsuhisa Yamada, Masahito Nawata, Masayuki Ieda
    1991 Volume 111 Issue 10 Pages 932-938
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_932
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    Effects of heat treatment on degradation in the electrical properties of ZnO ceramics after DC pre-stress were investigated from the viewpoint of the time dependence of the leakage current under DC pre-stressing, the voltage-current (V-I) characteristics, and the thermally stimulate current (TSC) before and after the DC pre-stressing.
    For none heat-treated sample, the leakage current increases with the increase of the DC pre-stressing time. In this sample, the degradation of the V-I characteristics observed and the new TSC peak observed at high temperature region after DC pre-stressing. The magnitude of this TSC peak is greater than that of the other TSC peaks. On the other hand, in the heat-treated sample at 600°C, the leakage current decreases with the increase of the DC pre- stressing time. The current in V-I characteristics decreases after the DC pre-stressing.
    From these results, it is suggested that the effect of DC pre-stressing on the electrical properties for ZnO ceramics is changed remarkably by the heat treatment after sintered ZnO ceramics. These phenomena will be associated with the phase transition of the Bi2O3-rich intergranular layer by heat treatment after sintered ZnO ceramics.
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  • Dielectric Recovery Characteristics of Short Air Gaps after Impulse Arc Discharge
    Koichi Tsuruta, Hajime Ebara
    1991 Volume 111 Issue 10 Pages 939-940
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_939
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  • Fractal Pattern of Dendrite on Conducting Polymer
    Masaharu Fujii, Kiyomitsu Arii, Katsumi Yoshino
    1991 Volume 111 Issue 10 Pages 941-942
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_941
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  • Incremental Shottoky Current and Associated Negative Ion Current in Dielectric Liquid
    Shichiro Tanifuji, Tetsuari Nozue
    1991 Volume 111 Issue 10 Pages 943-944
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_943
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  • Measurement of Incremental Shottky Current in Dielectric Liquid
    Shichiro Tanifuji, Tetsuari Nozue
    1991 Volume 111 Issue 10 Pages 945-946
    Published: October 20, 1991
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.111.10_945
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