IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 114, Issue 5
Displaying 1-13 of 13 articles from this issue
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  • High Voltage and Environment
    Tadasu Takuma
    1994 Volume 114 Issue 5 Pages 341-348
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_341
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  • Electron-Beam Flue-Gas Treatment System
    Sinji Aoki, Ryoji Szuki
    1994 Volume 114 Issue 5 Pages 349-355
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_349
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  • Characteristic of L=2 Helical Heliac
    Sumio Kogoshi, Nobu Tanomuro, Makoto Katsurai
    1994 Volume 114 Issue 5 Pages 356-360
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_356
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    It has been shown numerically that a L=2 helical heliac has a large helical axis, that is, Heliac-like magnetic configuration and lower magnetic ripple than for L=1. Magnetic shear is also improved for a L=2 helical heliac comparing with a Heliotron/Torsatron with similar coil parameters. A magnetic configuration having a magnetic well over wide range, moderate magnetic shear and relatively lower magnetic ripple is found.
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  • Optimal Tap Position in Lag Type Operating Circuit for High-Pressure Mercury Arc Lamp with By-Pass Circuit
    Mitio Iemura, Masaaki Kurosumi, Junichi Yamaguchi
    1994 Volume 114 Issue 5 Pages 361-369
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_361
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    The present authors have carried out study on the reduction of harmonic current at the power supply side, with taps providing on the way to a ballast in lag type operating circuit of high-pressure mercury arc lamp, and with a by-pass circuit connecting.
    Based on the theorectical consideration of lag type operating circuit with by-pass circuit, experiments have been carried out applying sinusoidal voltage to its input terminal. With the difference of tap positions to the ballast and the change in the characteristics of the lamp due to the variation of input terminal voltage considering, optimal tap position was lead through in comparison with the peak factor of lamp current, the distortion factor of power supply current, lamp, power, etc.
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  • Detection of Decomposed Gas Generated from an Arc Discharge in SF6 using a Dye Film
    Susumu Sato, Takehito Hara, Tamotsu Minowa
    1994 Volume 114 Issue 5 Pages 370-374
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_370
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    An optically detecting method for the decomposing reaction of SF6 gas by the arc discharge is proposed. A thin film of crystal violet which changes its color as the reaction with HF generated from the discharge in SF6 is deposited on a glass substrate by vacuum evaporation. The arc discharge is carried out in a glass container filled with SF6 gas for a simulation as a gas equipment. The ingredients and quantities of decomposed gases are analyzed by ion chromatography and the F-ion concentration is proportional to the discharge time. The change in the transmission and reflection spectra of dye films placed in the glass container are measured as a function of the discharge time. The change of tristimulus values X, Y, Z of the CIE colorimetric XYZ system and the CIE 1976 L*a*b* uniform color space are also evaluated. Since the correlational results of these parameters with the discharge time, corresponding to the HF concentration, are obtained, the possibility of optically watching and detecting the breakdown and abnormal phenomena in the gas insulating equipments is confirmed.
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  • Influence of DC Bias and Area of Substrate Table on Plasma Parameters in Microwave Plasma
    Isamu Kato, Toshiyuki Yoneda
    1994 Volume 114 Issue 5 Pages 375-380
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_375
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    In the deposition chamber of a double tubed coaxial line type microwave plasma chemical vapor deposition system, plasma parameters are measured with a cylindrical probe by varying the area of the substrate table to which DC bias voltage is applied. Electron temperature and electron density remain constant when the area of the substrate table and DC bias voltage are varied. It has been clarified that the dependence of plasma space potential on DC bias voltage varies with varying the area of the substrate table only within a range of the positive DC bias voltage. The saturation current density on the cylindrical probe differs from those on substrate tables. In addition, the saturation current densities on substrate tables differ from each other. It has been clarified that these differences in the saturation current densities can be explained by considering the thickness of single layer sheath formed on the cylindrical probe and the substrate tables.
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  • Electro-Motive Force Generated in MIM Structure of LB Films
    Taro Hino, Sang-Hoon Kook, Young-Soo Kwon, Shigeru Takeuchi
    1994 Volume 114 Issue 5 Pages 381-386
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_381
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    DC voltage generation in metal/insulator/metal (MIM) structures of LB films prepared in 1986-1987 is reported in the present paper. The characteristics of the voltage generation are similar to those when the MIM structures were prepared. According to the experimental facts, it is suggested that the cause of voltage generation is due to some kind of electro-motive force generated in the MIM structures except of chemical reaction.
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  • Thermal Equilibrium Voltage Generated in MIM Structure with Polyimide LB Films
    Taro Hino
    1994 Volume 114 Issue 5 Pages 387-391
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_387
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    Thermal equilibrium voltage generated in metal/insulator/metal (MIM) structure with polyimide Langmuir-Blodgett (LB) films is reported. That is, the open circuit voltage of the structures in thermal equilibrium was about 0.1V where the voltage was measured after separating the structures from the circuit for 20-40hrs. The voltage generation in the MIM structures seems to depend on such a thermal equilibrium voltage which is a very important keytoinvestigate the voltage generation in MIM structures.
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  • Diffusion of Carriers in Polyimide LB Films of MIM Structures
    Taro Hino
    1994 Volume 114 Issue 5 Pages 392-396
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_392
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    Diffusion of carriers (electrons) in polyimide LB films in Al/polyimide LB films/Au MIM structures is reported in the present paper. Time dependences of the generated voltage in this MIM structures was proportional to th square root of time. Such a relation can be explained by the diffusion of electrons from the Au electrode to the Al electrode through polyimide LB films. According to the experiments, diffusion constant of electron was about 2.5×10-17cm2/s. Furthermore, the diffusion current calculated by the diffusion constant coincided with the current measured in the experiments. It is considered that the diffusion of electrons is one of the main causes of the voltage geneation in the MIM structures of polyimide LB films.
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  • Leader Formation and Propagation of Positive Surface Discharges at Impulse Voltage in SF6 Gas
    Hiroyuki Hama, Kiyoshi Inami, Haruhisa Fujii, Takayuki Ooishi, Manabu ...
    1994 Volume 114 Issue 5 Pages 397-406
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_397
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    The paper studies the positive surface discharges initiated from the triple junction at which a solid insulator, SF6 gas and a metal electrode meet together. The transitions of the surface discharges at impulse voltage applications have been observed by the optical measurements with a photomultiplier and an image converter camera. The measurements show that the streamer to leader transition time is in inverse proportion to the gradient of impulse front dV/dt and independent of the gas pressure P. We propose the physical model based on the precursor mechanism to explain the new scaling law. In the model the following phenomena are considered; (1) dependence of the ion current in a streamer channel on the gradient dV/dt, (2) photoelectric emission from insulator surface, and (3) pressure dependence of the effective gap length at the triple junction. The proposed model is also applicable to the scaling laws on the leader propagation. The leader step time is proportional to P-1(dV/dt)-1, and the propagation speed of leader depends on the products of the leader inception voltage and the gradient dV/dt.
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  • Thermal shock properties of Pb(ZrxTi1-x)O3 ceramics
    Takashi Yamamoto, Sachio Oikawa, Kouichi Niihara
    1994 Volume 114 Issue 5 Pages 407-412
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_407
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    The critical temperature difference ΔTc of various lead zirconate titanate (PZT) compositions (Pb(ZrxTi1-x)O3, x=0.45-0.60) was determined by the water quenching test and discussed with related propertes. The compositions were chosen so that the crystal phase could be tetragonal (x=0.45 and 0.5), rhombohedral (x=0.55 and 0.60) and mixture of the two phases (x=0.53), i. e. morphotropic phase boundary (MPB), at room temperature, while these phases were cubic above the Curie point in all those compositions. At the MPB composition, the Young's modulus and three-point bending strength became the minimum, while poisson's ratio became the maximum. The experimentally obtained ΔTc values were almost constant (480-500°C) and independent of the composition. These ΔTc values were compared with the theory proposed for structual ceramics and discussed with the relaxation of thermal expansion due to the phase transformation.
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  • Humidity Detector of Diamond Polycrystalline Film
    Norio Furukawa, Yoichi Hirose, Yukio Akiba, Tateki Kurosu, Masamori Ii ...
    1994 Volume 114 Issue 5 Pages 413-414
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_413
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  • Measurement of Electrically Caused Flow Fields by Particle Tracking Method using a Genetic Algorithm
    Takaaki Tsukiji, Ryu-ichiro Ohyama, Kiyoji Kaneko
    1994 Volume 114 Issue 5 Pages 415-416
    Published: May 20, 1994
    Released on J-STAGE: July 15, 2008
    DOIhttps://doi.org/10.1541/ieejfms1990.114.5_415
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