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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133 巻, 2 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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特集：パルスパワーの生体作用と医・農・水・環境への先進応用
特集論文
  • パルス電界による農産物由来ポリフェノール抽出のパルス幅依存性
    中川 光, 畑山 仁, 高木 浩一, 小出 章二, 河村 幸男
    2013 年 133 巻 2 号 p. 32-37
    発行日: 2013/02/01
    公開日: 2013/02/01
    DOIhttps://doi.org/10.1541/ieejfms.133.32
    ジャーナル フリー
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    Effect of a pulsed electric field (PEF) on polyphenol extraction from grape skins in water was investigated experimentally. The grape skins were immersed in the distilled water between plate-to-plate electrodes in a rectangular shaped reactor. The pulsed voltage was generated by pulse forming network (PFN) to control a pulse width of the high-voltage applied to the plate electrode. The total polyphenol extracted from the grape skins was evaluated as gallic acid using the Folin-Ciocalteu method. The grape skins were observed by a microscopy to clarify the cell morphological change. The experimental results showed the polyphenol extraction from the grape skins was enhanced with increasing pulse width in the PEF treatment. The energy consumption required for the polyphenol extraction decreased with increasing pulse width of the applied voltage. A microscopic measurement clearly showed that many anthocyanoplasts in cells were collapsed and the red color pigments were extracted from anthocyanoplasts into the cell.
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  • 極性反転パルス電圧によるバリア放電処理におけるArabidopsis種子の発芽促進と抑制
    門脇 一則, 栗坂 信之
    2013 年 133 巻 2 号 p. 38-43
    発行日: 2013/02/01
    公開日: 2013/02/01
    DOIhttps://doi.org/10.1541/ieejfms.133.38
    ジャーナル フリー
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    This paper presents an experimental study on control of germination for Arabidopsis seed with a barrier discharge produced by polarity-reversed voltage pulses. 100 ns-width polarity-reversed pulses are applied to the seeds between plane electrodes covered by glass barriers. The electrode configuration allows the barrier discharge propagation along the seed surface at a relatively low voltage. After the discharge treatment, the seeds are incubated for 2 or 3 days to measure the germination rate. Relationships between the cumulative input energy density into plasma and the germination rate are investigated. Germination rate is significantly reduced by 20 J/cm3. However, it increases when the cumulative energy density is up to 50 J/cm3 and then it decreases again by the further energy input. These results propose a superposition of two effects, stimulation and inhibition, of the discharge treatment on the germination of Arabidopsis seed. Results of evans-blue dyeing for the discharge-exposed seeds indicate that necrosis of the seed coat is caused by the discharge treatment.
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論文
  • 水面上沿面パルス放電によるフミン酸塩溶液の吸光度，TOC，pHの変化
    布川 史章, 六角 虎太郎, 鈴木 進, 伊藤 晴雄
    2013 年 133 巻 2 号 p. 44-50
    発行日: 2013/02/01
    公開日: 2013/02/01
    DOIhttps://doi.org/10.1541/ieejfms.133.44
    ジャーナル フリー
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    Investigation on removal of persistent substances in water is performed by surface pulse discharge spreaded on the water utilizing pulsed power source. Humate, the target in this study, is one of the persistent substances. A Blumlein type pulse forming network (B-PFN) is provided in the work. The discharge gap in atmosphere that is a main part of the reactor is constructed by multi-needles and surface of the humate solution filled in a bath with mesh sheet as the earth electrode. In this study, temporal variations of the absorbance, pH and total organic carbon concentration (TOC) in the humate solution are investigated with observations by a spectrophotometer, an EC/pH meter and a total organic carbon analyzer. From the results, the decrease of absorbance in the humate solution is observed together with pH and total organic carbon concentration. We consider that the decreases of these quantities on humate solution are attributed by ultraviolet rays emitted from the surface discharge as well as the pulsed discharge in bubbles.
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  • ポリエーテルイミド絶縁紙とアラミド絶縁紙間での耐部分放電性と吸水後の誘電特性の比較
    片山 淳, 大木 義路
    2013 年 133 巻 2 号 p. 51-56
    発行日: 2013/02/01
    公開日: 2013/02/01
    DOIhttps://doi.org/10.1541/ieejfms.133.51
    ジャーナル フリー
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    Partial discharge resistance was compared between newly developed polyetherimide insulating paper and conventional aramid insulating paper. Effects of water absorption on dielectric properties were also compared. The time to breakdown via partial discharges observed for the polyetherimide paper by applying a constant voltage was found to be about twice as long as that observed for the aramid paper, while the partial discharge charge amount per unit time is similar in the two papers. Moreover, the average area of degraded portions induced by partial discharges is smaller in the polyetherimide paper than in the aramid paper. The polyetherimide paper absorbs less water than does the aramid paper, when they are immersed in water at 27 and 80°C for the same period. Because of this, complex permittivity and conductivity increase more significantly in the aramid paper than in the polyetherimide paper. Therefore, especially in a humid condition, the polyetherimide paper is superior to the aramid paper.
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  • Comparison Studies on Mechanical and Electrical Properties of Epoxy / Silica Nanocomposites using Hydrophilic and Hydrophobic Silica
    Hironori Matsumoto, Atsushi Ohtake, Akihiro Sano
    2013 年 133 巻 2 号 p. 57-63
    発行日: 2013/02/01
    公開日: 2013/02/01
    DOIhttps://doi.org/10.1541/ieejfms.133.57
    ジャーナル フリー
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    Studies on the mechanical and electrical properties of epoxy/silica nanocomposite using hydrophilic and hydrophobic silica is reported in this paper, which revealed that, while epoxy nanocomposite with hydrophilic nano-silica (NC-hydrophilic) excels in partial discharge resistance, epoxy nanocomposite with hydrophobic nano-silica (NC-hydrophobic) has better performance on fracture toughness and treeing resistance. Investigations into the morphology of nano-silica dispersion in epoxy resin, along with quantum chemistry based simulation analysis to the models of NC-hydrophilic and NC-hydrophobic, suggest that the formation of a network structure by hydrophobic nano-silica may lead to the observed excellent properties of NC-hydrophobic on fracture toughness and treeing resistance. Moreover, the homogeneous dispersion of nano silica achieved by hydrophilic nano-silica in NC-hydrophilic is considered to be the optimal condition to improve partial discharge resistance.
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