Papers - SAKODA Tatsuya
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Toshiyuki Hamada, Takuya Arimura, Tatsuya Sakoda
Plasma Chemistry and Plasma Processing 32 ( 2 ) 325 - 332 2012.4
Language：Japanese Publishing type：Research paper (scientific journal)
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Studies on optimal gas supply for a maskless etching system with micro- discharge plasma operated at atmospheric pressure Reviewed
Toshiyuki Hamada, Takuya Arimura, Tatsuya Sakoda
Plasma Chemistry and Plasma Processing 32 ( 2 ) 325 - 332 2012.3
Language：English Publishing type：Research paper (scientific journal)
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Insulation characteristics of polymer insulator materials with algaes
HONDA Kazufumi, OSHIKAWA Norihito, MIYAKE Takuma, SAKODA Tatsuya, OTSUBO Masahisa, FURUKAWA Seiji, TANAKA Kenji
2012 ( 13 ) 37 - 42 2012.1
Language：Japanese Publishing type：Research paper (scientific journal)
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Insulation characteristics of polymer insulator materials with algaes
HONDA Kazufumi, OSHIKAWA Norihito, MIYAKE Takuma, SAKODA Tatsuya, OTSUBO Masahisa, FURUKAWA Seiji, TANAKA Kenji
2012 ( 1 ) 37 - 42 2012.1
Language：Japanese Publishing type：Research paper (scientific journal)
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Characteristics of hydrophobicity loss on silicone rubber surface during a dynamic drop test with direct current voltage application Reviewed
Yuya Seo, Norihito Oshikawa, Takuma Miyake, Tatsuya Sakoda, and Tomikazu Anjiki
Nanoscale Research Letters 7 ( 4 ) 1 - 4 2012.1
Language：English Publishing type：Research paper (scientific journal)
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Miyake Takuma, Seo Yuya, Oshikawa Norihito, Sakoda Tatsuya, Otsubo Masahisa, Anjiki Tomikazu
The Journal of the Institute 32 ( 8 ) 593 - 599 2012
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Installation Engineers of Japan
Recently,much attention has been paid to polymeric materials used for housing of electric power apparatus. However,because polymeric material is made by organic matters,the aged deterioration is anxious. The lifetime of polymeric material is influenced by environmental conditions such as ultraviolet,acid rain,and polluted deposits. The change of the surface condition of polymeric material causes dry band arc discharges. To understand the long-term reliability of the insulation performance of polymeric materials,a composite pollution test of a liquid silicone rubber (LSR) was performed with dc or ac voltage application. After the test,heavy erosion was confirmed around a cathode electrode when dc voltage was applied. In the case of ac voltage application,heavy erosion was confirmed around a grounding electrode. It was also found that the initiation time of leakage current and cumulative charge depended on the kind of polluted deposits and that the difference of cumulative charge among polluted deposits in the case of dc voltage application was larger than that in the case of ac voltage application.
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Electrochemical Capacitances of Carbon Powder Treated with Dielectric Barrier Discharge
D. Tashima, R. Hirakawa, T. Sakoda and M. Otsubo
IEEE Conference on Electrical Insulation And Dielectric Phenomena 2011 Vol.1 109 - 112 2011.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Acoustic Emission Signals due to Several Discharges at a Joint Section of a XLPE cable
NAKAMURA Yuta, HIRANO Keita, KITAJIMA Junichi, SAKODA Tatsuya, KURIHARA Satoshi, KANEKO Koichiro, YARIMITSU Takayoshi
2011 ( 67 ) 81 - 84 2011.11
Language：Japanese Publishing type：Research paper (scientific journal)
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Study on the discharge ignition time of Silicone Rubber for a composite polluted test
OSHIKAWA Norihito, SEO Yuya, MIYAKE Takuma, SAKODA Tatsuya, ANJIKI Tomikazu
2011 ( 67 ) 77 - 80 2011.11
Language：Japanese Publishing type：Research paper (scientific journal)
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Electrochemical Capacitances of Carbon Powder Treated with Dielectric Barrier Discharge Reviewed
D. Tashima, R. Hirakawa, T. Sakoda and M. Otsubo
IEEE Conference on Electrical Insulation And Dielectric Phenomena 2011.10
Language：English Publishing type：Research paper (international conference proceedings)
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Assessing Long-term Reliability of Polymeric Housing Materials
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
Institute of Electrical Engineers of Japan Transactions on Power and Energy 131 ( 6 ) 530 - 531 2011.9
Language：Japanese Publishing type：Research paper (scientific journal)
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Nainggolan J., Sakoda T., Hayashi N., Kurihara S., Nagasato S., Kaneko K., Yarimitsu T.
European Journal of Scientific Research 59 ( 1 ) 134 - 142 2011.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：European Journal of Scientific Research
Acoustic emission (AE) sensor was used for detection of electric discharges and diagnosing a joint section of T-branch cross-linked polyethylene (XLPE) cable for 22 kV distribution system. From the head of cable joint, three AE sensors were arranged at the cable surface clockwise at 1200 to each other, and each sensor connected to an amplifier unit. Three AE sensors were used to generate three-dimensional calculation. A high voltage electrode was inserted into the joint section of cable, and then high voltage was applied to generate partial discharge (PD). PD current was detected by a Rogowski coil. The AE signal from the amplifier unit was sent to a digital oscilloscope and recorded in a personal computer for further analyses using LabVIEW. The correlation between AE signal and PD current was clarified. The increase of AE signal has the same linear tendency with increasing PD current. Thereafter, estimated three-dimensional PD locations were found around the head part of joint section of XLPE cable. © EuroJournals Publishing, Inc. 2011.
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Assessing Long-term Reliability of Polymeric Housing Materials Reviewed
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
Institute of Electrical Engineers of Japan Transactions on Power and Energy 131 ( 6 ) 530 - 531 2011.6
Language：English Publishing type：Research paper (scientific journal)
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Fabrication of electrode groove on silicon solar cell by high-pressure surface discharge
Hamada T., Arakawa S., Otsubo M., Sakoda T.
Electronics and Communications in Japan 94 ( 4 ) 733 - 739 2011.4
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electronics and Communications in Japan
We propose a low-cost plasma process technique to fabricate narrower front electrode grooves on a single crystalline silicon solar cell, in which a surface discharge operated at high pressure etches a silicon nitride film 150 nm thick on a silicon layer. Tests showed that the surface discharge could effectively etch the silicon nitride film in a short time; a high etching rate exceeding 3000 nm/min was obtained. Narrow and uniform grooves with a width of less than 70 μm were obtained when the pressure in the chamber, the back electrode length, and the etching time were 152 kPa, 2 mm, and 10 s, respectively. Narrower electrode grooves could be obtained when the back electrode length was short and the pressure was high. © 2011 Wiley Periodicals, Inc.
DOI： 10.1002/ecj.10305
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HIDAKA Toru, KANEKO Tadamitsu, MIYAKE Takuma, TAKENOUCHI Osamu, HAYASHI Noriyuki, SAKODA Tatuya, OTSUBO Masahisa
2011 ( 15 ) 25 - 28 2011.1
Language：Japanese Publishing type：Research paper (scientific journal)
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Comparison of Degradation Phenomena on Silicone Rubbers Eroded by DC and AC Discharges
Daiki Shiibara, Yoshihiro Arata, Tatsuya Sakoda, Masahisa Otsubo, Tomikazu Anjiki
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1009 - 1012 2010.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Etching Characteristics of Fabricated Grooves on Silicon Solar Cell Using Surface Discharge Plasma
Toshiyuki Hamada, Tatsuya Sakoda
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 999 - 1003 2010.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Tatsuya Sakoda, Mark Bowden
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1026 - 1030 2010.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Studies on Acoustic Emission Signals Detected in an Oil-immersed Pole Transformer
Takuya Yamamoto, Toshihiko Nakashima, Tatsuya Sakoda, Masahisa Otsubo, Satoshi Kurihara, Shinya Nagasato, Takayoshi Yarimitsu
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1031 - 1036 2010.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Relationship between Leakage Current and Pollution Deposits on the Surface of Polymeric Insulator
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1037 - 1041 2010.12
Language：Japanese Publishing type：Research paper (scientific journal)