電気学会論文誌Ａ（基礎・材料・共通部門誌）
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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134 巻, 3 号
選択された号の論文の14件中1～14を表示しています
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論文
  • 大気圧空気中における沿面ストリーマ進展シミュレーション
    田中 大樹, 熊田 亜紀子, 日高 邦彦
    2014 年 134 巻 3 号 p. 118-125
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.118
    ジャーナル フリー
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    Numerical simulations of surface streamer propagation in atmospheric air are carried out, and calculation results well correspond with experimental results by Pockels sensor system. Propagation and decay processes of the surface streamer are clearly specified from the calculation result. Number densities of charged particle are 1020m-3 and 1018m-3 in positive and negative surface streamers, respectively. In the positive polarity, the cathode fall region forms between the surface streamer and the dielectric barrier, and reduced electric field reaches about 1000 Td at the streamer head and 10-20 Td at the streamer channel. In the negative polarity, the streamer contacts the dielectric barrier surface, and reduced electric field reaches about 150 Td at the streamer head and 50 Td at the streamer channel.
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  • 水上直流コロナ放電を用いた水中難分解性有機物の分解
    見市 知昭, 野口 弘貴, 上垣内 洋平, 藤本 祐也, 成松 梨沙
    2014 年 134 巻 3 号 p. 126-133
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.126
    ジャーナル フリー
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    A method for decomposing persistent organic compounds in water by DC corona on water was investigated. The acetic acid as a persistent material was decomposed by corona discharge in oxygen 4 mm away from the surface of the water. The acetic acid in 10 ml solution was a concentration of 9.6-207 mg/l. The number of electrodes where the corona was generated was 4 or 8, the voltage was between 6.2 kV and 9.2 kV, and the current was between 0.09 mA and 0.34 mA. As the voltage and the number of discharge electrodes increased, the decomposition rate increased. The maximum decomposition speed of 4.8 µg/min was obtained with 8 discharge electrodes in initial concentration 20 mg/l of acetic acid. More numbers of the electrode were effective for the decomposition of the acetic acid in the equal discharge power.
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  • 過渡電磁界によるブロッコリーの成長効果に関する研究
    伊藤 亮太, 馬杉 正男
    2014 年 134 巻 3 号 p. 134-141
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.134
    ジャーナル フリー
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    This paper describes an analysis of the effects of transient electromagnetic fields on the growth of a plant. In our experiment, a single transient electromagnetic field, which was radiated from a discharge electrode (2 cm) of a discharge generator, was periodically applied to seeds and seedlings of broccoli (Brassica oleracea var italica) for three weeks. The pulse application cycles were set to 1 day and 3 days with charging voltages of 10 kV and 15 kV. In a growth environment, temperature and humidity were set to 25 (±3) °C and 50 (±10) %, respectively. Light photon at the top of leaf was set to 110 (±30) µmol/m2s and illuminating lamp lighted for 24 hours. Then, we measured the length and chlorophyll density of leaves of the growing plants in each condition. Also, based on measured current that flowed through the discharge electrode, we evaluated the radiated electromagnetic energy level by using an electric dipole model. As a result, we found that samples, which had been applied 10kV/3days and 15kV/3days, became greater than the others by around 30%. Also, the chlorophyll density of 10kV/3days and 15kV/3days became higher than the others.
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  • MgO/LDPEナノコンポジットの耐水トリー性
    栗本 宗明, 田中 知明, 村上 義信, 片山 知彦, 山崎 孝則, 村田 義直, 穂積 直裕, 長尾 雅行
    2014 年 134 巻 3 号 p. 142-147
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.142
    ジャーナル フリー
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    This paper presents water tree retardant characteristics of MgO/LDPE nanocomposite insulating material under the AC voltage application. Experimental results reveal that the addition of MgO nanoparticles retards the progress of water tree in LDPE matrix. Finally, we discuss the water tree retardant mechanism in the MgO/LDPE nanocomposite.
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  • 電磁鋼板の圧縮応力下の鉄損に及ぼすSi量の影響
    尾田 善彦, 戸田 広朗, 志賀 信勇, 笠井 勝司, 平谷 多津彦
    2014 年 134 巻 3 号 p. 148-153
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.148
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    The magnetic properties of non-oriented electrical steel sheets under compressive stress were investigated. The iron loss under compressive stress decreases with the increase of Si content. In particular, a 6.5%Si steel sheet shows extremely low iron loss under compressive stress. This decrease is due to the decrease of magnetostriction. To evaluate the effect of magnetostriction on iron loss of the motor, we made IPM motors using 3%Si steel and 6.5%Si steel. In the motor using 3%Si steel, the motor loss is increased after the heat shrinking. On the contrary, in the motor using 6.5%Si steel, the motor loss showed little change after the heat shrinking.
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  • 固化したアルコール水溶液の交流絶縁破壊特性
    土屋 龍平, 村本 裕二, 清水 教之
    2014 年 134 巻 3 号 p. 154-161
    発行日: 2014/03/01
    公開日: 2014/03/01
    DOIhttps://doi.org/10.1541/ieejfms.134.154
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    We have been studied the use of ice, solidified H2O, as electrical insulating material at cryogenic temperature. Ice has excellent electrical breakdown strength. In addition, ice is environment-friendly material and easy to be molded into various shape because it is liquid at room temperature. However, ice has the several problems as electrical insulating material; one is that voids or cracks are easily formed.
    In this paper we tried to improve the A.C. breakdown strength of ice by mixture of water-soluble material, namely by producing solidified aqueous-solution. We chose alcohol as water-soluble material; namely ethanol, 1-propanol, 2-propanol, propylene glycol and glycerin. We examined the A.C. breakdown strength of solidified alcohol aqueous-solution at 77 K. As the results, the A.C. breakdown strength of solidified 2-propanol aqueous-solution shows the highest, 64% higher value than ice.
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