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114 巻, 1 号
選択された号の論文の11件中1～11を表示しています
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電子サイクロトロン共鳴とヘリコン波プラズマ岡本 幸雄1994 年 114 巻 1 号 p. 1-8
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーPDF形式でダウンロード (1381K) -
福村 隆志1994 年 114 巻 1 号 p. 9-17
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーWhen an electromagnetic wave is injected at angle Θ0 of incidence into the plasma, which has a density gradient, the elecromagnetic wave is reflected at the cut-off plane nr=cn(cos2Θ0). In the lower density region from the cuo-off plane, a standing wave of electromagnetic wave is generated. In this case, it is well known that the electric field will be enhanced in front of the cut-off plane. Therefore, it could be expected that this enhanced fild would produce plasmas by ionization in the neighborhood of the cut-off plane.
Even if a microwave field is injected into the lower pressure neutral gasses, in case of no magnetic field, the microwave discharge will not generally occur. But, when the microwave is injected into the target plasma which was generated by RF discharge, so far as this paper is concerned, the above described ionization occurs. As a result of our experiments, it is clarified that the microwave ionization occurs, when the cut-off plane exists within the RF coil for the plasma production.抄録全体を表示PDF形式でダウンロード (1597K) -
杉本 俊之, 東山 禎夫, 浅野 和俊1994 年 114 巻 1 号 p. 18-24
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーCorona point discharge at the tip of a grounded needle electrode inserted into a charged droplet cloud has been investigated. Water droplets ejected from an airless nozzle were charged by the induction charging method and form a space charge cloud. The charge quantity and the polarity of space charge cloud were adjusted by changing the magnitude and the polarity of applied voltage to induction electrodes. The cloud is confined within a cylindrical grounded electrode 1m in diameter and 2m in height to define the size of the cloud. The maximum charge density of the cloud obtained was 2.6μC/m3. Corona discharge occurred when the grounded needle electrode was inserted into the center of the charged cloud. The discharge aspect depends on the polarity and the charge density of the cloud and also on the radius of a needle electrode. In a negative charged cloud, positive glow corona occurred when small radius of needle electrode was used. However, positive streamer corona was observed when a large radius of needle electrode was used. In a positive charged cloud, negative pulse corona occurred and the discharge aspect did not depend on the radius of a needle electrode.抄録全体を表示PDF形式でダウンロード (1276K) -
坂口 威, 新田 希, 松浦 勇二, 畑中 雅彦, 西辻 昭1994 年 114 巻 1 号 p. 25-30
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーElectric field-electric current characteristics in positive column of He-Ne gas mixed glow discharges were measured and calculated. The measured values were in good agreement with calculated results. When the gas pressure ratio of helium to neon is ten to one, electric fields are higher than those of helium gas only. The high electric field is ascribed to excitation transfer which the energy in metastable atoms of helium is transfered to metastable atoms of neon.抄録全体を表示PDF形式でダウンロード (904K) -
池上 知顕, 垣内 武, 蛯原 健治, 赤崎 正則1994 年 114 巻 1 号 p. 31-39
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーCharacteristics of electrical discharges triggered by a high power KrF or ArF excimer laser were studied to investigate fundamental mechanisms of a laser-induced discharge. Experiments were done in the different kind of ambient gases (air, N2, O2 of 100-1000mb in pressure) under an uniform DC electric field using Rogowski electrodes. Electrical characteristics such as 50% flashover voltage, an initial current due to a laser-produced plasma and a delay time from a laser incidence to a flashover were measured. Also optical measurements, such as a streak image of a flashover, transmittance of a laser light in gases, and temporal and spatial spectral emissions from molecular, atomic, and ionic species of O2 and N2 were carried out. It was found that oxygen molecules play an important role in characteristics of a laser-initiated discharge.抄録全体を表示PDF形式でダウンロード (2076K) -
西田 直樹, 大嶋 重利, 奥山 克郎, 中島 健介, 山下 努1994 年 114 巻 1 号 p. 40-46
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーThe electric properties of hetero LB films consisting of Cd-Arachidate and C15TCNQ were studied. It was found from deposition ratio, capacitance and X-ray diffraction measurements that Cd-Arachidate LB films are Y-type structure. On the other hands, C15TCNQ LB films were clarified from deposition ratio to be Y-type or Z-type structure depending on the nature (hydrophilic or hydrophobic) of the substrate. However, Y-Z mixed structure were found to exist by X-ray analysis in the films estimated to be Y or Z-type from the deposition ratio. We measured the electrical resistance of Cd-Arachidate-C15TCNQ hetero LB films expecting the low electrical resistance at the hetero interface. However, the value of electrical resistance was almost as high as that of an insulator. We also found the electrical switching phenomenon for our LB films. The electrical resistance switches from higher resistance state (OFF state) to lower resistance state (ON state), when the voltage is applied to the normal or lateral direction of the film.抄録全体を表示PDF形式でダウンロード (1699K) -
丸山 悟, 小林 正三, 工藤 勝利1994 年 114 巻 1 号 p. 47-52
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーThe three-dimensional reconstructed images of real electrical trees and their fractal characteristics are described. A method for three-dimensional reconstructed images of real electrical trees is based on serial sectioning of a specimen with a microtome, and stacking of the image-processed information from the sections using a personal computer. Specimens in this investigation were cross-linked polyethylene (XLPE) and the experiment for tree was carried out in a needle-plane electrode geometry under AC or impulse voltage application. The fractal dimensions for the three-dimensional reconstructed trees and their two-dimensional projected patterns were estimated mainly by means of a box counting method.
The obtained results show that the three-dimensional reconstructed images of real electrical trees have fractal properties, and the fractal dimension for tree-like trees is less than 2 and the fractal dimension for ball-like trees lies between 2 and 3. The results also indicate that there is a relationship between the fractal dimension of the three-dimensional reconstructed trees and that of the two-dimensional projected patterns.抄録全体を表示PDF形式でダウンロード (1723K) -
浅田 規裕, 松木 英敏, 江刺 正喜1994 年 114 巻 1 号 p. 53-60
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーA new planar transformer with bulk ferrite core is described. We call this new transformer 'Planar Pot Transformer (PPT)'. PPT having planar coils with high aspect ratio was fabricated by electroplating in order to reduce copper loss. In this paper, design considerations, fabrication and fundamental characteristics of PPT are reported. The fabricated PPT is 8.5mm in width, 8.0mm in length and 1.3mm in hight, showing a DC breakdown voltage of 1kV. The efficiency of PPT is over 85% at 500kHz-1MHz (Mu-Zn ferrite core) and over 90% at 3-10MHz (Ni-Zn ferrite core). A high reliability insulating relay driver was realized by using PPT. Relay driver efficiencies of over 60% at 3-10MHz could be obtained with a Ni-Zn ferrite core.抄録全体を表示PDF形式でダウンロード (2195K) -
高木 浩一, 秋山 秀典, 前田 定男1994 年 114 巻 1 号 p. 61-62
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーPDF形式でダウンロード (573K) -
小林 義和, 吉村 昇1994 年 114 巻 1 号 p. 63-64
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーPDF形式でダウンロード (628K) -
三井 久安, 佐藤 好美, 数藤 茂彰, 谷本 元1994 年 114 巻 1 号 p. 65-66
発行日: 1994/01/20
公開日: 2008/07/15
ジャーナル フリーPDF形式でダウンロード (733K)
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