Papers - SAKODA Tatsuya
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Improvement of discharge ignition characteristics of a surge arrester with a spark gap
Horie H., Sakoda T., Kubo K., Mizutani M., Fukano T.
IEEJ Transactions on Power and Energy 137 ( 11 ) 724 - 729 2017
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：IEEJ Transactions on Power and Energy
© 2017 The Institute of Electrical Engineers of Japan. Surge arrester with a spark gap has been installed for reducing electrical failures in Japanese distribution system. The top and the bottom of a ceramic spacer for sustaining an electrode gap in a surge arrester contact with electrodes, of which the electric field becomes high. Therefore, high electric field region such as the triple junction point becomes a source to supply electrons to a spark-gap. In this study, we made some electrodes with a small step edge on an inclined plane of an electrode. The electric field around the small step edge became high, and we aimed that the small step edge functioned as if it were a triple junction points for a conventional spark gap. Based on measurements of V-t characteristic and the number of electrons per unit time, we investigated that the artificially formed high electric field region lower impulse spark-over voltage and that a spark-over voltage occurs within a duration of 0.4-1.2 μs when a positive impulse voltage of 25-42 kV with 1.2/50 μs is applied. The results will contribute on a further stabilization of discharge and increasing a degree of freedom for design of a spark gap.
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Chemical Analysis of Casual Elements for Deterioration of Cylindrical EDLC
Yoshitama H., Tashima D., Sakoda T., Hayashi N., Yuhara M., Utsunomiya T.
Electronics and Communications in Japan 99 ( 12 ) 36 - 43 2016.12
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electronics and Communications in Japan
© 2016 Wiley Periodicals, Inc. Chemical analysis was carried out before and after the constant voltage hold test that was an acceleration deterioration examination to clarify deterioration factors of electric double-layer capacitor (EDLC). The results showed that the stress test slightly caused the increase of internal resistance. It was also confirmed that the range of fluorochemicals was formed on the electrode surface for approximately 10 nm in depth using electron spectroscopy for chemical analysis (ESCA). From the chemical analysis of the electrolyte using an inductively coupling plasma emission analyzer (ICP-OES), it was confirmed that the electrolyte included silicon which is one of the ingredient elements of an electrode and that the increase in holding voltage in the stress test decreased the silicon density in the electrolyte.
DOI： 10.1002/ecj.11911
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Chemical Analysis of Casual Elements for Deterioration of Cylindrical EDLC Reviewed
Hiroumu Yoshitama, Daisuke Tashima, Tatsuya Sakoda, Noriyuki Hayashi, Masamitsu Yuhara, Takashi Utsunomiya
Electronics and Communications in Japan 135 ( 12 ) 792 - 798 2016.12
Language：English Publishing type：Research paper (scientific journal)
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Detection of Partial Discharges in Electric Power Equipment using an Electromagnetic Wave Sensor Reviewed
Yugo Shirahama, Toshiki Hirashima, Mitsuki Kawakone, Takuma Miyake, Tatsuya Sakoda
Joint Conference of IWHV2016 & JK2016 on ED&HVE 51 - 54 2016.11
Language：English Publishing type：Research paper (international conference proceedings)
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Study on improvement of discharge characteristics of a surge arrester with a spark gap Reviewed
Hibiki Horie, Takuma Miyake, Tatsuya Sakoda, Tatsuya Tokunaga, Katsutaka Kubo, Manabu Mizutani, Takato Fukano
Joint Conference of IWHV2016 & JK2016 on ED&HVE 81 - 85 2016.11
Language：English Publishing type：Research paper (international conference proceedings)
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Numerical Analysis of I-V Characteristics and Siode Currents of a PV Module Reflected by Partial Shadow Reviewed
C. I. Wade, R. Torihara, Y. Fukamachi, T. Sakoda, N. Hayashi
2016 IEEE Region 10 Conference (TENCON) 2644 - 2647 2016.11
Language：English Publishing type：Research paper (international conference proceedings)
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マンゴー炭疽病菌の分生胞子の殺菌に必要なオゾン濃度および処理時間に関する研究 Reviewed
富永大, 田中聡之, 迫田達也, 溝口則和, 櫛間義幸
電気学会論文誌 A 136 ( 11 ) 726 - 727 2016.11
Language：Japanese Publishing type：Research paper (scientific journal)
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STERILIZATION OF COLLETOTRICHUM SP. USING A DISCHARGE SOURCE Reviewed
Takeshi Nishimura, Masaru Tominaga, Junichiro Tsuchida, Tatsuya Sakoda, Norikazu Mizoguchi, Yoshiyuki Kushima
The First International Conference on Hybridized Agriculture 40 - 46 2016.10
Language：English Publishing type：Research paper (international conference proceedings)
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絶縁ゴムのトラッキング劣化過程におけるAE信号特性
平島俊紀，白浜優吾，中村友哉，三宅琢磨，迫田達也，緒方貴仁，鎌田文麿，副島通邦
宮崎大学工学部紀要 45 ( 199 ) 204 2016.7
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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マンゴーに発生する病害にプラズマ処理が与える影響
堂園大雅, 富永大, 迫田達也, 溝口則和, 櫛間義幸
宮崎大学工学部紀要 45 193 - 198 2016.7
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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ポリマー材料の傾斜角度がポリマー表面の放電特性に与える影響
出口竜也, 枦健一, 三宅琢磨, 迫田達也, 阿嘉良昌, 安食富和, 深野孝人
出宮崎大学工学部紀要 45 187 - 192 2016.7
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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AE及び電磁波センサを用いた部分放電検出”,宮崎大学工学部紀要
朝倉匡俊, 井平学, 三宅琢磨, 迫田達也, 壱岐祐典, 前田健作
宮崎大学工学部紀要 45 181 - 185 2016.7
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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熱電発電システムにおける開放電圧を用いた最大出力点の探索法 Reviewed
奥将俊，石津智子，田島大輔，迫田達也，林則行，穂高一条
太陽エネルギー 42 ( 4 ) 49 - 55 2016.4
Language：Japanese Publishing type：Research paper (scientific journal)
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電力ケーブル接続部に有効な周波数加速劣化試験の基礎的検討 Reviewed
井平学, 平島俊紀, 三宅琢磨, 迫田達也, 中野亮介, 鎌田文麿, 西昌美
電気学会論文誌A 136 ( 3 ) 241 - 242 2016.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Plasma Sterilization of Anthrax Pathogen in Water Mist
Tominaga M., Tanaka T., Sakoda T., Mizoguchi N., Kushima Y.
Proceedings - 2015 IIAI 4th International Congress on Advanced Applied Informatics, IIAI-AAI 2015 690 - 694 2016.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Proceedings - 2015 IIAI 4th International Congress on Advanced Applied Informatics, IIAI-AAI 2015
© 2015 IEEE. Miyazaki prefecture in Japan promotes agricultural food industry in recent year. One of the activities is promotion of agricultural and livestock products. However, Miyazaki prefecture is very far from large-scale consumption areas such as Tokyo and Osaka. To keep freshness of agricultural and livestock products during their transport is a serious problem from a viewing of putrefaction due to blight outbreak. Apple Mango has been a very famous and representative product in Miyazaki prefecture and it has successfully continued to make a good profit. However, fruit rot disease such as Anthrax Pathogen after harvest is serious [1] [2] [3]. Therefore, a sterilization technique is strongly required. We here generated the dielectric barrier discharge plasma in water mist, which may possible to sterilize the whole of greengrocery because of its high diffusibility. We examined fungicidal activity against Colletotrichum sp.
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Examination of B. Subtilis Spore Sterilization by an Underwater-Ar-Plasma
Hamada Toshiyuki, Mine Taiki, Sakoda Tatsuya
IEEJ Transactions on Fundamentals and Materials 136 ( 1 ) 64 - 65 2016.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan
Advanced oxidation process (AOP) with hydroxyl radicals (OH) is considered to be useful for sterilization; therefore, we have proposed an underwater plasma source with a porous glass membrane which functioned in bubble supply and the formation of micro-discharges. In this study, we first examined whether B. subtilis spores could be sterilized by the underwater plasma of which operating gas was argon. Next, similar experiment was conducted by using mannitol, and the numbers of colonies were compared. The obtained results showed that OH radicals generated at gas-liquid interface were responsible for the sterilization.
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多孔質膜利用の水中アルゴンプラズマによる芽胞菌殺菌機構の考察 Reviewed
濱田俊之, 峰大樹, 迫田 達也
電気学会論文誌A 136 ( 1 ) 64 - 65 2016.1
Language：Japanese Publishing type：Research paper (scientific journal)
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Basic Study on Frequency Accelerated Aging Test for Joint Section of XLPE Cable
Ihira Manabu, Hirashima Toshiki, Miyake Takuma, Sakoda Tatsuya, Nakano Ryosuke, Kamata Fumimaro, Nishi Masami
The transactions of the Institute of Electrical Engineers of Japan.A 136 ( 3 ) 155 - 156 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan
We studied usefulness of a frequency accelerated aging test by paying attention to the number of partial discharge (PD) pulses and the accumulated PD charges per a cycle of frequency of applied voltage. The results shows that a frequency accelerated aging test is useful when the accumulated PD charges per a cycle of frequency of applied voltage with higher than PD inception voltage are the almost same as that at a commercial frequency of 60 Hz. If applied frequency is 1 kHz, an accelerated aging test with 16.6 times faster than that for 60 Hz can be achieved.
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Tominaga Masaru, Tanaka Toshiyuki, Sakoda Tatsuya, Mizoguchi Norikazu, Kushima Yoshiyuki
IEEJ Transactions on Fundamentals and Materials 136 ( 11 ) 726 - 727 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan
<p>To investigate optimal concentration of O<sub>3</sub> and process time for sterilization of conidiospore of <i>Colletotrichum </i>sp., we examined sterilization by using CT (product of concentration and process time) as a sterilization index. The results showed that the usual CT was not be useful for interpreting sterilization.</p>
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Characteristics of an underwater plasma source with a porous glass membrane
Shiomitsu E., Sakoda T.
Electronics and Communications in Japan 98 ( 12 ) 72 - 79 2015.12
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electronics and Communications in Japan
© 2015 Wiley Periodicals, Inc. The advanced oxidation process (AOP) with hydroxyl radicals (OH) is considered to be useful for water purification through oxidation; therefore, we proposed an underwater plasma source with a porous glass membrane which performed the functions of bubble supply and the formation of microdischarges. We observed bubble formation and light emission from discharges on the surface of the membrane using a high-speed camera and a spectroscope, respectively. In addition, the dependence of gas pressure on the generation of OH radical and the decomposition of recalcitrant organic matter were examined. The obtained results showed that AOP may be more effective when the operating gas pressure is set higher than a pressure which could form bubbles.
DOI： 10.1002/ecj.11772