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山田 忠利
1999 年 119 巻 6 号 p.
703
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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豊島 令隆
1999 年 119 巻 6 号 p.
704-711
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
-
直流型リサイクルと交流型リサイクル
郡嶌 孝
1999 年 119 巻 6 号 p.
712-714
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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真壁 利明, 木村 健
1999 年 119 巻 6 号 p.
715-724
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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岩本 雅民, 岩本 宙造
1999 年 119 巻 6 号 p.
725-730
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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Keping Yan, Seiji Kanazawa, Toshikazu Ohkubo, Yukiharu Nomoto
1999 年 119 巻 6 号 p.
731-737
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
This paper discusses the characteristics of streamer corona and NO removal in air with pulsed and simplified DC/AC power supplies. In simplified gaseous mixtures of N
2+NO and N
2+O
2+NO and at room temperature, the energy efficiencies for NO removal are the same order of the magnitude with pulsed and simplified DC/AC power supplies. Near 100% of NO could be removed from air with a corona specific energy density of 2Wh/Nm3 for lower NO concentrations (NO_??_25ppm). DC/AC energized streamer corona may be one of the most cost effective and commercial available techniques for producing non-thermal plasma with larger electrodes gap distance (_??_5cm). Moreover, a detailed comparison between various corona induced non-thermal plasma techniques is presented.
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水野 幸男, 水野 要, 内藤 克彦
1999 年 119 巻 6 号 p.
738-743
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The effect of forced-flowing of liquid nitrogen on (1) breakdown voltage of liquid nitrogen, (2) surface flashover voltage along polymeric rod immersed in liquid nitrogen and (3) lifetime to breakdown of polymeric film by partial discharges in liquid nitrogen were examined.
Breakdown voltage of forced-flowing liquid nitrogen was a littele higher compared with that of liquid nitrogen without forced-flowing. A slight increase of surface flashover voltage along acrylic rod was observed in forced-flowing liquid nitrogen. Lifetime to breakdown of polyethylene film subjected to partial discharges is longer in forced-flowing of liquid nitrogen. Considering the results of partial discharge measurements, the phenomena may be attributed to restraint of propagation of discharges by forced-flowing liquid nitrogen.
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西本 昌彦, 生野 浩正
1999 年 119 巻 6 号 p.
744-749
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
In order to reveal the end-effects of a finite grating in pure form, scattering problem of electromagnetic waves by a semi-infinite strip grating is analyzed, and scattered fields are investigated in space-wavenumber domain by using the Gaussian Windowed Fourier Transform (GWT). The GWT used here is a powerful tool for the spacewavenumber analysis of scattering data, because it can provide better insights into scattering mechanisms that are not immediately apparent in the space domain. In the resultant space-wavenumber displays, the Floquet's modes excited by the periodic structure and the cylindrical wave diffracted at the edge of the grating are resolved and identified, and the behavior of them are clearly observed.
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花岡 良一, 堀田 浩司, 安齋 秀伸, 桜井 宏治, 黒田 真一
1999 年 119 巻 6 号 p.
750-757
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The interrelationship between the internal structure and the rheological properties in electrorheological (ER) suspensions subjected to a DC applied field was investigated using two ER suspensions (which were called as ERF(I) and ERF(II) in this text). There was a remarkable difference in the internal structure between ERF(I) and ERF(II), and the ER response in ERF(II) which contained the negative fluorine ions was larger than that in ERF(I) without these ions. These are related to an ionic interfacial activity of dispersed particles involving the polarization of a diffuse double sheath. The effects of the voltage polarity and the gap spacing on the rheological properties in two ER suspensions were also examined. Differences in the test results were attributed to the internal structure in the suspensions. It is also shown that the further promotion of the ER response in ERF(II) is obtained by the installation of a metallic mesh on the electrode surface.
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古川 達也, 芦川 学, 相知 政司, 嶋田 英樹
1999 年 119 巻 6 号 p.
758-763
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The authors have devised and proposed a current-voltage sensor embedded in an insulator, which realizes a concurrent measurement of both the waveforms of the current and the voltage without contact inthree-phase power distribution systems. Furthermore they have conducted the finite element analysis of thesensor to investigate the electromagnetic effect due to the geometrical arrangements of the conductors andthe overhead ground wire. As a result, the existence of the phase shift in the measured waveforms in thesensor has been clarified. In the paper, the geometrical effects, such as the interval between the distributionline and the overhead ground wire, on the phase shifts between the measured and practical waveforms inboth the horizontal and vertical arrangements of the distribution lines are simulated and discussed.
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相知 政司, 古川 達也
1999 年 119 巻 6 号 p.
764-769
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
We have investigated a non-destructive measurement method of various permittivity in the multi-medium. To establish this method, we have used a measurement method of a long distance small parallel-plate air capacitor with an additional electrodes in which an electric potential is fixed equal to one of the respective main measurement plates. The visualization of the electric field is necessary to clarify the present measurement principle. However, it is virtually impossible to visualize a distribution of the electric field by the experiment. We illustrate the electric lines of force using the scalar potential in the various models for analysis. This paper proposes the method of the estimation of capacitance for considering both the edge displacement currents flowing through the dielectric. The electrostatic energy in the area surrounded by two electric lines of force, which are drawn from the both the ends of low potential measurement plate, are estimated in this method. In the paper we will discuss about the effect of location of the dielectric on the capacitance theoretically.
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山元 洋, 鈴木 宏一
1999 年 119 巻 6 号 p.
770-775
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Experiments were carried out to investigate on the magnetic and physical properties of Ba-Zn-Cu W-type hexagonal ferrites sintered without atmosphere control. Composition were chosen according to the formula BaZn
2-XCu
XFe
16O
27, where X was varied 0-0.5 and 1.0. The effect of BaO addition after semisintering treatment on magnetic properties of Ba-Zn-Cu compounds was examinend. It was found that BaO addition for Ba-Zn-Cu compounds was very useful in stabilizing the W-type hexagonal. The optimum condition of making magnets and some properties of a typical specimens are as follows: composition; BaZn
1.7Cu
0.3Fe
16O
27 in addition with 4wt% BaO, semisintering condition 1275°C for 1.0h in air, sintering condition 1175°C for 0.5h in air, magnetic properties and lattice constant are J
m=0.405T, J
r=0.370T, H
cJ=88.15kA/m, H
cB=81.96kA/m, (BH)
max=19.12kJ/m
3, T
c=356°C, H
A=994.7kA/m, K
A=2.01×10
5J/m
3, c=32.928×10
-10m, a=5.927×10
-10m, c/a=5.556
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Kohei Hongo, Hirokazu Kobayashi
1999 年 119 巻 6 号 p.
776-782
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
A Fock-type representation of the surface fields can be obtained for the transition region of the circular cylinder with impedance boundary conditions when it is illuminated by an obliquely incident plane wave. First, the eigen function expansions for the surface fields are derived using a standard method. Then, the Watson transformation is applied to derive expressions which are uniform in the transition region. This current supplements the PO current approximation near the transition region. The correction to the PO currents is expected to improve upon the accuracy of the prediction of the scattered field. The validity of the Fock-type representation was verified numerically by comparing with the exact series solution.
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千田 邦浩, 石田 昌義, 黒澤 光正, 小松原 道郎
1999 年 119 巻 6 号 p.
783-789
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The needle probe method equipped with a Hall probe revealed the details of the magnetic properties in a small area of grain-oriented electrical steel. In addition to the domain width, the localized magnetic flux density and the a -angle strongly effected the localized iron loss. The local change of permeability or domain width within the same grain, caused by magnetic poles along the grain boundaries, also varied a localized iron loss.
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山崎 実, 水口 博崇, 浜野 正昭, 山元 洋, 井上 明久
1999 年 119 巻 6 号 p.
790-795
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Limiting Nd content up to 8 at%, amorphous-phase remaining α Fe/NdFeB nanocomposite melt spun and heat treated ribbons with various additional elements can be obtained. The optimum surface velocity of the single roller apparatus for better coercive force (HcJ) is 10-15 m/s. By adding Nb, HcJ increases monotonically. This may be attributed to the fine-grained structure, according to the micromagnetic theory. For example, nearly homogeneous crystal size distribution of around 5 nm is observed in a sample of Nd
8Fe
76Co
8Nb
2B
6. When Nd=8 at%, maximum HcJ is as large as 575kA/m (7.22kOe) at Nb=2.5 at%, and the best (BH)max is 154kJ/m
3(19.4MGOe) at the same composition. By high-resolution transmission electron microscopy, remaining amorphous phase is observed in ribbons with Nd=8 at%. The remaining amorphous phase shows soft magnetic properties and is thought to act as a crystal growth inhibitor.
Epoxy-resin bonded magnets were prepared by the compression molding. It is found that, comparing to the MQP magnet using MQP-B powder, the (BH)max is in the same level of 72kJ/m
3 (9MGOe), and magnetizability at lower magnetic field than 800kA/m (10kOe) is superior. Initial flux loss at 100°C for 1 hr, however, is in the range of 3-8% depending on Nb contents.
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青木 振一, 池上 知顯, 蛯原 健治
1999 年 119 巻 6 号 p.
796-801
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Carbon nitride (CNx) thin films have been synthesized by a pulsed laser deposition system. The graphite carbon target is ablated in mixture of nitrogen and hydrogen ambient gas and the CNx films were deposited on Si(100) and fused quartz glass. We investigated the effect of the substrate temperature (Ts) and the substrate negative bias voltage (Vs) on the infrared (IR) absorption characteristics. The IR absorption spectra show two characteristic absorptions as 1600 cm
-1 (C=N, C=C) and 2120cm
-1 (C≡ N). An optimum CNx thin film deposition condition of Ts=150°C and Vs=-150V was obtained.
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土居 光代, 屋鋪 裕義, 岡田 康孝
1999 年 119 巻 6 号 p.
802-807
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Influence of S (Sulfur) content on the iron loss deterioration by punching operation and the machinability of non-oriented electrical steel sheets was investigated. The iron loss deterioration of the higher S steels (0.020-0.025 mass% S) by punching fine pieces is less than that of the lower one (0.005 mass% S), as a result of inhibiting plastic strain effectively near punching edge in the higher's ones. Moreover, cutting tool wear and cutting burr of the higher S steel is less than that of the lower's one. It is concluded that non-oriented electrical steels containing higher S show good performance for applying to small size motors, which can be required to be higher energy efficiency and higher productivity.
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中村 元, 加藤 健一, David Book, 杉本 諭, 岡田 益男, 本間 基文
1999 年 119 巻 6 号 p.
808-813
発行日: 1999年
公開日: 2012/08/11
ジャーナル
フリー
HDDR conditions for obtaining the anisotropic Nd-Fe-B powders and their microstructures have been investigated. For both of the disproportionation and recombination stages, the alloys treated at the H
2 pressures which are close to the equilibrium one, result in highly anisotropic powders. Anisotropic volume expansions of the disproportionated alloys were observed, which would be the key to the inducement of anisotropy.
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蒲原 弘昭, 工藤 善則, 篠原 功, 伊藤 彰
1999 年 119 巻 6 号 p.
814-820
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The deterioration diagnosis for XLPE cables using low-frequency voltage has been confirmed that it is able to detect not only bridged water trees but also un-bridged water trees. However, its degraded detecting performance has not been proven.
In this paper, we examined the properties of a DC leakage current and a low-frequency loss current through the use of cables with different degrees of deterioration, and studied the performance of each measurement in detecting water-tree deterioration.
As a result, it has been confirmed that for a water tree that has bridged an insulator, it is possible to detect deterioration in both the DC leakage-current measurement and the low-frequency loss-current measurement. On the other hand, for a water tree that has not bridged an insulator, although deterioration signals were not obtained in the DC leakage-current measurement, as is generally known, it has been ascertained that deterioration can be detected in the low-frequency loss current measurement.
The above results has made it clear that the result obtained by the method of combining low-frequency method with DC leakage current method is high reliability.
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片岡 直紀, 薮 隆之, 内野 喜一郎, 村岡 克紀, 岡田 龍雄, 前田 三男, 須中 栄治, 榎波 龍雄, 溝口 計
1999 年 119 巻 6 号 p.
821-827
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
The aim of this research is to understand and control the preionization processes in high pressure discharges used for excimer lasers. For this purpose, a chamber having a spark light source at one end was designed and fabricated so that it could achieve ultra-high and oil-free vacuum. Photocharge signals were collected by a set of pairs of plate electrodes placed inside the test chamber. Special care was paid to mix small amounts of addition gases uniformly in the Ne gas at 1 atm. These efforts have enabled us to observe the basic photoionization characteristics of the addition gases. The result showed that, for the case of Xe gas as an addition gas, the photocharge signal increased linearly with the Xe pressure below 0.1 Torr, while rapidly decreased at higher pressures (_??_0.1 Tort). Xe gas was then added to mixed gases used for excimer lasers (the Ne, F
2 and Ar mixture) in order to examine the possibility of actively controlling the preionization process. The signal when 0.1 Torr Xe gas was added was more than 10 times higher than that without Xe, suggesting that an active control may be possible.
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内海 通弘, 林 宏充, 植田 清隆, 村岡 克紀, 木下 文宏, 赤崎 正則, 田中 祀捷, 本田 親久
1999 年 119 巻 6 号 p.
828-834
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
In order to optimize the method to use both UV and IR laser in inducing a negative impulse discharge in a rod-torod electrode configuration, three kinds of techniques such as the cross-beam, the cascaded-beam and the overlappedbeam methods have been examined. In case of the cross-beam method, the two lasers were required to be simultaneously applied at a carefully controlled instant within a time range of 20 ns. It would be very difficult to use them for a long gap discharge. In case of the cascaded-beam method, although the two lasers were required to have almost the same output energy, it would be very useful to extend the guiding length. In case of the overlapped-beam method, acceleration of a leader by the overlapping was observed.
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石 福烈, 小松 宏彰, 原 雅則
1999 年 119 巻 6 号 p.
835-840
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Bubble behavior is studied theoretically and experimentally with a simulated electrode system of HTc superconducting Fault Current Limiter. The basic electrode system is concentric coil layer-to-cylinder and three winding arrangements are considered in the simulation of bubble behavior. The simulation results of bubble behavior suggest that (1) bubble behavior is influenced markedly by the winding arrangement and (2) that coil embedded deeply into the slot on the FRP bobbin is very effective in removing the induced bubbles from the liquid channel.
Experimental observation shows that the bubble rises along the liquid channel at no applied voltage, but are trapped between coil electrode beyond a critical applied voltage. The critical voltage depends on the channel width. The observation results agree fairly with the simulation results
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山納 康, 大橋 敦, 加藤 克巳, 袴田 好美, 大久保 仁
1999 年 119 巻 6 号 p.
841-847
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
In space environment, severe conditions like electron irradiation may cause the electrostatic charging and discharge on dielectric surface of space apparatus. In order to investigate the charging mechanism in vacuum, we irradiated electron beam to different kind of dielectric samples and produced electrostatic charging on their surface. We measured 2-dimensional distribution of surface potential on the dielectric samples and displacement current to back electrode. Experimental results revealed that the charging process is mainly influenced by electron energy, secondary electron emission and electric field around the dielectric samples.
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廣田 憲, 岡田 聡郎, 丸田 賢一, 関井 康雄
1999 年 119 巻 6 号 p.
848-853
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Using XLPE specimens containing several kinds of antioxidant (AO), the effects of peroxide decomposition products (PDP) and antioxidant (AO) in XLPE insulation on ac tree initiation was investigated. The PDP and some kinds AO were confirmed to have the effect of tree suppression. The tree suppression at elevated temperature was also studied. The tree inception voltage of XLPE containing the PDP decreases with the increase of temperature. This decrease is considered to be caused by the evaporation of the PDP at high temperature. The tree inception voltage of XLPE with a phenolic AO or a UV absorber also decreases with the increase of temperature. The fall down of tree inception voltage of XLPE containing both PDP and UV absorber was not so great even at 80°C, while the drop of the inception voltage of XLPE without the PDP was significant. To examine the mechanism of tree suppression due to the PDP, PDP content in the vicinity of the needle electrode in the specimen was measured using FTIR microscope. The result demonstrates that the. content of acetophenone and cumylalcohol decreases with the increase of the distance from the needle tip, which could support the mechanism of tree suppression caused by the electric field relaxation at the needle tip. The mechanism of tree suppression due to the AO was also examined.
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陳 思潮, 武田 浩一, 小野 茂, 吉野 利男, 堤井 信力
1999 年 119 巻 6 号 p.
854-859
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Surface treatment of the stainless steel plate (SUS304) to improve the adhesion strength with epoxy resin using low-pressure argon inductively coupled plasma (ICP) has been carried out. The adhesion strength with the epoxy resin for the plasma treated stainless steel plate was compared with those of the chemical etched, sand blasted and no treated plates. Plasma treated test piece showed the highest adhesion compared with those treated by other methods and the value of adhesion strength was increased by a factor of 3 larger than that of no treated test piece regardless of the relatively small value of roughness of the treated surface. The experimental results are discussed using SEM observation and also the roughness curves. It is concluded that the surface roughness created by deposition of the plasma sputtered species on the test piece is responsible for the highest adhesion obtained.
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池上 知顕, 丸田 和彦, 山形 幸彦, 蛯原 健治
1999 年 119 巻 6 号 p.
860-865
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
During TiN thin films deposition by PLD in nitrogen ambient gas, high voltage negative pulses of -4kV to -8kV and 20μsduration were applied synchronously with the laser to a substrate holder as used in PIII. Effects of the high voltage pulses on theplasma plume were investigated by measuring the ion current to the holder and emission spectra from the plasma plume. A bulkvelocity and density of Ti
+ were estimated to be 1.6×1O
4m/s and 6×10
11cm
-3, respectively. A delay time between laser incidenceand H. V. pulse application could change the ion current to the substrate due to drift of Ti
+ and nitrogen ions. It seems useful tochange N to Ti atomic composition ratio in the film. Emission spectra from the plume showed that main species ejected from thetitanium target was Ti
+. Nitrogen molecule ions N
2+ were produced by the collisions between N
2 and high energy Ti
+.Characterization analyses of the deposited films showed that H. V pulses applied to the substrate holder increased N atom composition ratio of the film and slightly improved the crystallization of the film.
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大津 康徳, 藤田 寛治
1999 年 119 巻 6 号 p.
866-871
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Electron energy distribution functions and secondary electrons produced by ion bombardment in a capacitively coupled radio frequency (RF) plasma have been investigated using electrostatic analyzer at various driving frequencies f. The results revealed that for f _??_ 10MHz electron acceleration by moving RF sheath (α-mode) was dominant for sustaining mechanism, while for f _??_ 10MHz secondary electrons from RF electrode γ-mode) was dominant.
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羽柴 靖人, 加藤 克巳, 仲神 芳武, 宮本 昌広, 大久保 仁
1999 年 119 巻 6 号 p.
872-877
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
In this paper, we carried out an optical measurement of electric field in transformer oil by using Kerr effect to discuss electric field and charge behavior in transformer oil induced by flow electrification. We constructed a system which consisted of electro-optic field measurement part and an oil flowing part. By using this system, we measured electric field in charged transformer oil. When charged oil flew into the measurement system without voltage application, electric field appeared in the oil. Particularly, when a pressboard was placed in the field measurement system, electric field appeared strongly because of charge accumulation on the pressboard. We discussed experimental results from the viewpoints of leakage current and the time constant of electric field relaxation in equivalent circuit. Finally, we investigated charge behavior in flowing transformer oil, and proposed a model which could explain charge behavior associated with the flow electrification.
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山納 康, 大橋 敦, 加藤 克巳, 大久保 仁
1999 年 119 巻 6 号 p.
878-883
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
This paper describes the laser-induced plasma characteristics at 100kPa-1Pa. Outgassing from the surface of space apparatus caused by charged particle collisions may cause discharges on dielectric surface. In order to quantitatively understand such outgassing phenomena, we used TEA-C0
2 laser focused to solid target and produced plasma on the target. We measured plasma characteristics using photodiode and still camera, and obtained plasma light waveforms and plasma illumination images. Then we investigated the laser-induced plasma formation mechanism. Experimental results revealed characteristics of laser-induced plasma such as plasma light intensity and plasma illumination image. As a result, at 100kPa-1kPa, the laser-induced plasma characteristies highly depended on the residual gas. On the other hand, at less than 1kPa, the plasma highly depended on the target material. Furthermore plasma illumination distribution showed the high dependence on pressure or target materials.
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生澤 泰二, 佐藤 智英, 楊 建波, 西嶋 喜代人
1999 年 119 巻 6 号 p.
884-890
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Sparkover characteristics in a positive rod to plane air gap under DC voltages have been investigated. The sparkover voltages were measured in room air, dry air, N
2/O
2 mixtures and N
2/NO mixtures, in which NO, O
2 and water vapor were associated to the corona stabilized effect.
To make clear the mechanism of corona stabilization, we control the corona discharge using a laser. These sparkover characteristics controlled by the pulsed laser are very different from those without the laser. The different characteristics have been discussed in terms of corona mode transition due to the induced electron burst with the laser irradiation. As a result, the laser induced electron burst accelerates the mode transition from burst corona to streamer corona depending on the gaseous composition.
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山田 達司, 高橋 俊裕, 早川 直樹, 吉田 篤哉, 大久保 仁
1999 年 119 巻 6 号 p.
891-896
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Extension characteristics of partial discharge (PD) and breakdown (BD) characteristics under ac and dc voltage application were investigated to clarify breakdown mechanisms in SF
6/N
2 gas mixtures. In order to measure the PD extension length, we observed light images of PD with an image intensifier and a still camera. We calculated the electric field at the tip of PD as a measure to discriminate leader discharge from streamer discharge.
From these results, we found that at around 0.1MPa, in accordance with the generation and extension of PD and BD, there was no difference between in positive half cycle and in negative one. On the contrary, at around 0.3MPa or more, because of the streamer-to-leader transition in positive half cycle, PD and BD characteristics in positive half cycle were quite different from the one in negative half cycle. Consequently, we pointed out the importance of the PD extension mechanism to consider the BD characteristics in SF
6/N
2 gas mixtures.
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Toshikazu Nomura, Yoshiyasu Ehara, Tairo Ito
1999 年 119 巻 6 号 p.
897-898
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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猪原 哲, 見市 知昭, 石峯 真佐志, 佐藤 三郎, 山部 長兵衛, 酒井 英治
1999 年 119 巻 6 号 p.
899-900
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
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Hirofumi Takikawa, Aristotle M. Coronel, Tateki Sakakibara
1999 年 119 巻 6 号 p.
901-902
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
Multi-wall carbon nanotubes were synthesized by dc carbon arc discharge method in various ambient gasessuch as He, H
2, N
2, O
2, C
2H
2, and C0
2, and at different pressures (3-100 kPa). The appearance of the nanotubesand nanoparticles on the cathode surface varied with respect to these experimental parameters. The remarkableconditions, in which considerable amount of nanotubes prepared with the fewest nanoparticles, were obtained inboth H
2 and O
2 ambient at 25 kPa and 100 A.
抄録全体を表示
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門脇 一則, 西本 栄, 木谷 勇
1999 年 119 巻 6 号 p.
903-904
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
We could observe the residual charges on polymer-film/electrode contact with a thin air layer directly by the use of pulsedelectroacoustic method. The thin air layer has an important role as an acoustic shield of the pressure wave from the inducedcharges which are aligned closely to the residual charges. Heights of the detected signals were in good agreement with theresidual voltages after removal of the upper brass electrode.
抄録全体を表示
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根本 孝七
1999 年 119 巻 6 号 p.
906
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー
-
斉藤 芳男
1999 年 119 巻 6 号 p.
907
発行日: 1999/06/01
公開日: 2008/07/15
ジャーナル
フリー