電気学会論文誌E(センサ・マイクロマシン部門誌)
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
最新号
選択された号の論文の9件中1~9を表示しています
特集:令和2年度センサ・マイクロマシン部門総合研究会
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特集解説論文
特集論文
  • 田中 恒久, 中山 健吾, 村上 修一
    2021 年 141 巻 5 号 p. 125-133
    発行日: 2021/05/01
    公開日: 2021/05/01
    ジャーナル 認証あり

    We developed a MEMS ultrasonic array sensor that is capable of detecting 1 MHz airborne ultrasonic waves for use in devices for inspecting the interior of objects. The sensor is an array of vibrating membranes, each consisting of a metal lower electrode, a platinum upper electrode, and a polymer ferroelectric layer between them. In this study, two kinds of electrode materials, aluminum or gold, were used for the lower electrode to investigate how they affect the characteristics of such high resonant-frequency sensors. The sensor using aluminum showed about four times better sensitivity than that using gold.

  • 野村 修平, 田代 洋行, 寺澤 靖雄, 中野 由香梨, 春田 牧人, 笹川 清隆, 竹原 浩成, 太田 淳
    2021 年 141 巻 5 号 p. 134-140
    発行日: 2021/05/01
    公開日: 2021/05/01
    ジャーナル 認証あり

    To develop a visual prosthesis, it is necessary to understand the changes in the electrochemical properties of stimulating electrodes implanted in the body. To evaluate these properties, we examined three types of equivalent circuit models that represented the electrode interface 23 weeks after the stimulation began. The results indicated that the Randles circuit model with Warburg impedance exhibited the difference in the electrochemical properties of the active and inactive electrodes, which might have been caused by the desorption of adsorbed protein from the electrode surface owing to the stimulation current. This model can be used to characterize the changes in the properties of porous stimulating electrodes.

  • 肥田 博隆, 江原 りか, 林 駿平, 神野 伊策, 古水 千尋, 澤 進一郎
    2021 年 141 巻 5 号 p. 141-146
    発行日: 2021/05/01
    公開日: 2021/05/01
    ジャーナル 認証あり

    Plant-parasitic nematodes cause the significant damage to agricultural crops all over the world. To establish an environmental-friendly method for managing the plant-parasitic nematodes, understanding the infection process is important. In this paper, we present a new method for analyzing an effect of external stimulation on the infection process of plant-parasitic nematodes, Meloidogyne incognita or root-knot nematode, by using a microfluidic device integrated with micropillar array. We estimated the applied mechanical stresses, which act as the external stimulation, on the gall (or root knot) by using the contact analysis based on finite elemental method. By using the developed analytical system, we clearly observed the growth behavior of the growing roots infected with the plant-parasitic nematodes. The experimental results suggest that the mechanical stress might effectively inhibit the growth of the gall formed by the infection of root-knot nematodes.

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