川島 朋裕 (カワシマ トモヒロ)

Two-dimensional Space Charge Measurement in Cable Joint Model Using the Pulsed Electroacoustic Method
Shafira Zahra,Masaki Utagawa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Peter Morshuis,Young Il Cho,Yoon Hyoung Kim
IEEE Transactions on Dielectrics and Electrical Insulation 2024年 This study discusses the space charge measurement in a scaled cable joint model as a move towards it...

Nanosize Filler Effect on Propagation of Electron Avalanche in Terms of Waveform Characteristics of Partial Discharge
Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Muneaki Kurimoto,Shigeyoshi Yoshida,Takahiro Umemoto,Takahiro Mabuchi,Hirotaka Muto
IEEE Transactions on Dielectrics and Electrical Insulation 30(6) 2642-2649 2023年12月 Nanocomposite materials have excellent insulating properties, such as improved treeing resistance. T...

回転機巻線用ワニスへの適用を目指した脂環式エポキシ樹脂の電気特性
池之俣諒央,川島朋裕,穂積直裕,村上義信
電気学会研究会資料(Web) 18(10) 1583-1588 2023年08月 Epoxy resins (EP) are commonly used to power apparatus due to their excellent electrical, thermal, a...

パルス静電応力法による空間電荷測定における波形変動を利用した較正手法の基礎検討—Basic Study on Calibration using Waveform Variation in Space Charge Measurement by Pulsed Electroacoustic Method—特集 2022年基礎・材料・共通部門大会
李 暁欣,川島 朋裕,村上 義信,穂積 直裕
電気学会論文誌. A, 基礎・材料・共通部門誌 = IEEJ transactions on fundamentals and materials 143(4) 136-141 2023年04月 The pulsed electroacoustic method determines the distribution of space charge in an insulation syste...

Transfer Matrix for Space-charge Analysis of Insulating Systems with Complex Geometries
Xiaoxin Li,Yeongguk An,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
2023 IEEE 4th International Conference on Electrical Materials and Power Equipment, ICEMPE 2023 2023年 Time resolved space charge measurements by acoustic methods, such as the pulsed electroacoustic (PEA...

空間電荷顕微鏡による界面電荷形成過程の観察
安田かな,LI Xiaoxin,川島朋祐,村上義信,穂積直裕
電気学会全国大会講演論文集(CD-ROM) 2023 269-272 2023年 In high-voltage insulation systems, the space charge that accumulates in the insulation is a problem...

Measurement of Spark Discharge Inception Voltage Using CIGRE Method-II Type Metal-Air Gap-Metal Electrode System
Tomoaki Sakakibara,Tomohiro Kawashima,Naohiro Hozumi,Yoshinobu Murakami
Proceedings of the International Symposium on Electrical Insulating Materials 285-287 2023年 A minute air gap may become a weak electrical point in an insulation system. A successive partial di...

Discrimination of Insulation Condition based on Partial Discharge Waveform using Deep Learning
Tomohiro Kawashima,Ho Quang,Yoshinobu Murakami,Naohiro Hozumi
Proceedings of the International Symposium on Electrical Insulating Materials 88-91 2023年 The characteristics of the partial discharge (PD) waveform reflect the behavior of electron avalanch...

静電吸着法で作製したtpPI/hBNコンポジット材料のQ(t)法による絶縁特性の測定
佐藤佑介,川島朋裕,穂積直裕,村上義信
電気学会全国大会講演論文集(CD-ROM) 2023 247-249 2023年 A composite material with higher thermal conductivity and acceptable breakdown strength has been dev...

Assessment of Surface Resistivity of Insulation System Using Waveform Characteristics of Partial Discharge
Wikanda Nantanawut,Quang Ho,Tomohiro Kawashima,Yoshinobu Murakami,Boonchai Techaumnat,Naohiro Hozumi
Proceedings of the International Symposium on Electrical Insulating Materials 103-106 2023年 Partial discharge measurement is important for the analysis of the equipment condition by using as a...

Two-dimensional Space Charge Measurement of Scaled Cable Joint Model and Signal Compensation
Shafira Zahra,Masaki Utagawa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Peter Morshuis,Young Il Cho,Yoon Hyoung Kim
Proceedings of the International Symposium on Electrical Insulating Materials 45-48 2023年 This study deals with the measurement of space charge in a scaled cable joint model as a step toward...

Influence of Bridging between Insulating Materials on the Partial Discharge Inception Voltage in Insulating Material-Air Gap-Insulating Material Electrode Systems
Yoshinobu Murakami,Takahisa Wada,Tomohiro Kawashima,Naohiro Hozumi
IEEJ Transactions on Fundamentals and Materials 142(12) 446-450 2022年12月 A minute air gap may result in a successive partial discharge in an insulation system. Here, the par...

部分放電波形の特徴量に基づく絶縁体表面の抵抗率変化の推定に関する基礎検討
川島朋裕,蛭川泰丞,吉川敢大,村上義信,穂積直裕
電気学会論文誌 A 142(12) 440-445 2022年12月 The partial discharge (PD) waveform reflects the evolution process of electron avalanche in the disc...

Signal Processing for Space Charge Measurement Using Laplace Deconvolution
An Yeongguk,Xiaoxin Li,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) 811-814 2022年11月 This paper deals with the space charge measurement on full-size HVDC insulation systems using the pu...

集束超音波振動子を利用した三次元空間電荷顕微鏡の検討
安田かな,LI Xiaoxin,歌川真生,川島朋裕,村上義信,穂積直裕
電気電子絶縁材料システムシンポジウム予稿集 53rd (CD-ROM) 2022年11月

Reconstruction of Partial Discharge Waveform in Mock Simulated of Insulation Joint by Deconvolution Processing
Kanta Yoshikawa,Kanata Takeda,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) 619-623 2022年11月 The partial discharge measurement in the cable is usually carried out by electrically connecting the...

Dielectric Spectroscopy under Extremely High Voltages
Keigo Yata,Masaki Utagawa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) 392-395 2022年11月 The current-integral method (namely, the Q-t method) applies a step-like high voltage to an insulati...

Fundamental Study on Calibration of Space Charge Distribution by Frequency-resolved Analysis
Naohiro Hozumi,Xiaoxin Li,Tomohiro Kawashima,Yoshinobu Murakami
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) 199-202 2022年11月 For the pulsed electroacoustic method which measures the space charge distribution by converting to ...

Pseudo-transmission imaging of cultured cells by using focused ultrasound reflectometry
Mai Murakami,Yuki Kawaguchi,Fatini Athirah Mohmad Fadzeli,Yuto Isobe,Tomohiro Kawashima,Yoshinobu Murakami,Kazuto Kobayashi,Sachiko Yoshida,Naohiro Hozumi
Proceedings of Symposium on Ultrasonic Electronics 43 131-132 2022年11月 [査読有り]

木材表面のトラッキング現象を題材とした高電圧教育
川島朋裕,歌川真生,吉川敢大,村上義信,穂積直裕
電気学会論文誌 A 142(11) 419-425 2022年11月 Engineers who are good at handling high voltage are in high demand from the industries. On the other...

Space Charge Measurement Equipment for Full-Scale HVDC Cables Using Electrically Insulating Polymeric Acoustic Coupler
Shafira Zahra,Shosuke Morita,Masaki Utagawa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Peter Morshuis,Young-II Cho,Yoon-Hyoung Kim
IEEE Transactions on Dielectrics and Electrical Insulation 29(3) 1053-1061 2022年06月 A new, very sensitive device for space charge measurements on full-size cable is proposed. The measu...

Electrical treeing breakdown characteristics of epoxy/TiO2 nanocomposites influenced by aggregates of nano-sized TiO2
Yoshinobu Murakami,Daichi Yamada,Norihiko Kodama,Tomohiro Kawashima,Naohiro Hozumi,Shigeyoshi Yoshida,Takahiro Umemoto,Takahiro Mabuchi,Hirotaka Muto
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 17(3) 486-492 2022年03月 Inorganic fillers and additives are commonly used as polymer insulating materials such as an epoxy r... [査読有り]

Electrical treeing breakdown characteristics of epoxy/spherical boron nitride with card-house structure composites
Yoshinobu Murakami,Takeshi Noda,Tomohiro Kawashima,Naohiro Hozumi
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 17(2) 169-173 2022年02月 A spherical boron nitride with a card-house structure (sBNch) was developed to enhance the filler's ... [査読有り]

Time and frequency domain deconvolution for cross-sectional cultured cell observation using an acoustic impedance microscope.
Edo Bagus Prastika,Taichi Shintani,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Thomas Tiong Kwong Soon,Sachiko Yoshida,Ryo Nagaoka,Kazuto Kobayashi
Ultrasonics 119 106601-106601 2022年02月 Herein, we propose a method to estimate the reflection coefficient of the ultrasonic wave transmitte... [査読有り]

Two-dimensional Space Charge Measurement of Scaled Cable Joint Model
Shafira Zahra,Masaki Utagawa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Peter Morshuis,Cho Young-Il,Kim Yoon-Hyoung
ICD 2022 - IEEE 2022 4th International Conference on Dielectrics, Proceedings 74-77 2022年 In order to establish a space charge measurement method for a full-size HVDC cable joint, a two-dime...

Acquisition of calibration signal in space charge measurement by pulsed electrostatic method
Xiaoxin Li,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
2022 IEEE International Conference on High Voltage Engineering and Applications, ICHVE 2022 2022-January 2022年 The pulsed electroacoustic method determines the distribution of space charge in an insulation syste...

Three-dimensional acoustic impedance mapping of human skin by improved time-frequency domain analysis
Edo Bagus Prastika,Atsushi Imori,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Sachiko Yoshida,Ryo Nagaoka,Kazuto Kobayashi
Japanese Journal of Applied Physics 60 2021年07月 Three-dimensional acoustic impedance microscopy was proposed for human cheek skin observation. A foc... [査読有り]

Development of Thermal Conductive tpPI/Oriented h-BN Insulating Composite Material Using the Electrostatic Adsorption Method
Yoshinobu Murakami,Norikazu Hamasaki,Akio Kikuike,Tomohiro Kawashima,Naohiro Hozumi
IEEJ Transactions on Electrical and Electronic Engineering 15(11) 1580-1584 2020年11月 A thermal conductive plate in a device like a power module for an automobile requires materials with... [査読有り]

Charge behavior measurement near the interface parallel to the electric field
保子純一,川島朋裕,穂積直裕,村上義信,塩田裕基,門脇和丈
2020 International Symposium on Electrical Insulating Materials, Tokyo, Japan 2020-September 325-326 2020年09月 It is important to understand the charge behavior in a multilayer insulation system in which the ele... [査読有り]

The Application of Signal Processing Using Dual Domain Deconvolution for New Space Charge Measurement Method in HVDC Full-Size Cables
Edo Bagus Prastika,Shafira Zahra,Xiaoxin Li,Y. Murakami,T. Kawashima,N. Hozumi,Yoonhyoung Kim
2020 International Symposium on Electrical Insulating Materials, Tokyo, Japan 2020-September 277-280 2020年09月 This article deals with the space charge measurement for full size HVDC cables by means of Pulse Ele... [査読有り]

Nondestructive fault localization of semiconductor devices with ultrasound heating
Takuto Matsui,Hayato Hayashi,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Toru Matsumoto
Proceedings of the International Symposium on Electrical Insulating Materials 2020-September 470-473 2020年09月 As a conventional alternative, the IR-OBIRCH method is widely used to localize faults in semiconduct... [査読有り]

Dual-domain Deconvolution Process Applied to Time-resolved Quantitative Dielectric Measurement
N. Hozumi,Edo Bagus Prastika,Shafira Zahra,T. Kawashima,Y. Murakami
2020 IEEE 3rd International Conference on Dielectrics, Valencia, Spain 347-350 2020年07月 Deconvolution process is often applied to time-resolved dielectric measurements like the pulsed elec... [査読有り]

Frequency determination in nondestructive test of semiconductor devices with ultrasound heating
Takuto Matsui,Kosuke Tatsumi,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Toru Matsumoto
Japanese Journal of Applied Physics 59(SK) 2020年07月 The infrared-optical beam induced resistance change (IR-OBIRCH) method is widely used to localize fa... [査読有り]

Acoustic impedance interpretation of cross-sectional human skin by using time and frequency domain deconvolution
Edo Bagus Prastika,Atsushi Imori,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Sachiko Yoshida,Ryo Nagaoka,Kazuto Kobayashi
Japanese Journal of Applied Physics 59(SKKB06) 1-7 2020年07月 In the human cheek skin assessment using an ultrasound microscope, deconvolution is the process to e... [査読有り]

Sensitivity improvement of ultrasonic beam induced resistance change (SOBIRCH) method with ultrasound resonance inside mold resin
Takuto Matsui,Kosuke Tatsumi,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Shigeru Eura,Toru Matsumoto
Microelectronics Reliability 109 2020年06月 In some cases of the failure analysis of semiconductor devices, package state analysis without decap... [査読有り]

Space Charge Characteristics of Slide-ring Materials under Various Voltage Applications
O.Masui,Y. Itakura,T. Kawashima,N. Hozumi,Y. Murakami
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena, East Rutherford, USA, 2020-October 108-118 2020年 Dielectric elastomers have potential for devices such as a pressure sensor or an actuator for an art... [査読有り]

Effect of solid nitrogen particles on partial discharge characteristics in slush nitrogen
K. Yamada,T. Kawashima,Y. Murakami,N. Hozumi
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena, East Rutherford, USA 2020-October 173-176 2020年 In immersion cooling superconducting equipment, the refrigerant plays the double role of cooling and... [査読有り]

Assessment of charge behavior in electrical tree of composite material based on characteristics of PD waveform
N. Takeda,T. Kawashima,M. Kurimoto,Y. Murakami,N. Hozumi,S. Yoshida,T. Umemoto,T. Mabuchi,H. Muto
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena, East Rutherford, USA, 2020-October 334-337 2020年 Electric tree is a phenomenon of local dielectric breakdown with partial discharge (PD). It is also ... [査読有り]

Propagation observation of creepage discharge using multi-array coaxial probe
T. Kawashima,S. Hanamoto,Y. Murakami,N. Hozumi
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena, East Rutherford, USA, 2020-October 136-139 2020年 The clarification of the discharge phenomenon in micro-gap is strongly required in a wide range of a... [査読有り]

Assessment of Charge Behavior in Electrical Tree Tube Based on Characteristics of Partial Discharge Waveform
N. Takeda,T. Kawashima,Y. Murakami,N. Hozumi
2020 International Symposium on Electrical Insulating Materials, Tokyo, Japan, VL-4 572-575 2020年 Electrical trees are the final stage of an insulation degradation with partial discharge (PD). In a ... [査読有り]

Temperature-dependent Electrical and Thermal Characteristics of tpPI/h-BN Composite Insulating Material Using Electrostatic Adsorption Method
T. Tachibana,K. Kikuike,T. Kawashima,N. Hozumi,Y. Murakami
2020 International Symposium on Electrical Insulating Materials, Tokyo, Japan VF-2 407-409 2020年 The composite material with both a higher thermal conductivity and acceptable breakdown strength has... [査読有り]

複合層の界面付近を進展するトリーの多方向観測システムの開発
坂本和也,阿邊槙之介,川島朋裕,穂積直裕,村上義信,塩田裕基,門脇和丈
電気学会論文誌 A 140(8) 417-422 2020年 To understand the electrical treeing properties at an interface, treeing breakdown tests are perform... [査読有り]

Space charge measurement method for model HVDC cable at high conductor temperature
Trinurkalid Sumarwoto,S. Morita,T. Kawashima,N. Hozumi,Suwarno
Lecture Notes in Electrical Engineering 599 LNEE 1065-1074 2020年 Polymer insulated HVDC power cable is being implemented for submarine transmission. Since the insula... [査読有り]

Discrimination of partial discharges in gaseous and liquid nitrogen by using waveform characteristics
Kazuki YAMADA,Tomohiro KAWASHIMA,Tetsuhiro OBANA,Yoshinobu MURAKAMI,Masayuki NAGAO,Naohiro HOZUMI
Plasma and Fusion Research 15(SpecialIssue1) 2401025-2401025 2020年 The cryogenic coolant is important as an electrical insulation in an immersion cooling. One of the d... [査読有り]

超高圧直流ケーブル用空間電荷計測における温度勾配下での信号歪みの補正方法の検討
森田翔亮,川島朋裕,村上義信,穂積直裕
電気学会論文誌 B 140(4) 271-276 2020年

The waveform immediately after the start of measurement has been used as a calibration waveform i... [査読有り]

Basic electrical characteristics of epoxy/hollow silica composites influenced by addition of hollow silica
Yoshinobu Murakami,Takayuki Matsubara,Tomohiro Kawashima,Naohiro Hozumi
Electronics and Communications in Japan 102(11) 3-8 2019年11月 Polymeric insulating materials like an epoxy resin due to their excellent electric performance and a... [査読有り] [依頼有り]

Fundamental study for breakdown characteristic of slush nitrogen as a coolant in superconducting coil
K. Yamada,T. Kawashima,Y. Murakami,N. Hozumi
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Richland, USA 2019-October 577-580 2019年10月 Liquid nitrogen is mainly used as a coolant of superconducting coils. If the coolant has a higher co... [査読有り]

Fundamental Study for Quantification of Change in PD Waveform on Electrical Treeing
T. Kawashima,Totoh Abdul Matin,Y. Murakami,N. Hozumi,S. Yoshida,T. Umemoto,T. Mabuchi,H. Muto
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Richland, USA 2019-October 418-421 2019年10月 Partial discharge (PD) measurement has been used as a test to evaluate the insulation systems and as... [査読有り]

Electrical and Thermal Properties of PMMA/h-BN Composite Insulating Materials Produced by Electrostatic Adsorption Method
R. Minami,N. Hamasaki,T. Kawashima,N. Hozumi,Y. Murakami
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Richland, USA 2019-October 50-53 2019年10月 Thermal conductive plates in devices such as power modules for automobiles require materials which h... [査読有り]

Treeing Breakdown Property in Epoxy/TiO Nanocomposites
N. Kodama,D. Yamada,T. Kawashima,N. Hozumi,Y. Murakami,S. Yoshida,T. Umemoto,T. Mabuchi,H. Muto
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2019-October 118-121 2019年10月 Additives and fillers are traditionally employed in polymer insulating materials like an epoxy resin... [査読有り]

The Investigation of the Hydrophobicity and Flashover Strength of Silicon Rubber with Coal Fly Ash (CFA) Micro-Filler
Tajuddin Waris,Tomohiro Kawashima,Naohiro Hozumi,Yoshinobu Murakami
Proceedings of the 2nd International Conference on High Voltage Engineering and Power Systems: Towards Sustainable and Reliable Power Delivery, ICHVEPS 2019 2019年10月 Hydrophobicity and flashover strength are important properties of outdoor insulators, especially in ... [査読有り]

Electrical and Thermal Properties of PMMA/h-BN Composite Material Produced by Electrostatic Adsorption Method
Hamasaki Norikazu,Yamaguchi Shuhei,Use Shohei,Kawashima Tomohiro,Muto Hiroyuki,Nagao Masayuki,Hozumi Naohiro,Murakami Yoshinobu
電気学会論文誌Ａ（基礎・材料・共通部門誌） 139(2) 60-65 2019年10月

The electrostatic adsorption method can be used to produce composite materials with an arbitrary ... [査読有り]

Assessment of charge behavior in water tree-degraded cables under pulse voltages
Nhet Ra,Ryota Yamane,Hiroyuki Futami,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
IEEJ Transactions on Electrical and Electronic Engineering 14(8) 1126-1132 2019年08月 In this article, water tree degradation was detected and was located by applying the method entitled... [査読有り]

Development of a Partial Discharge Measuring Method for a Long-Distance Cable Line
Nhet Ra,Nur Sabihah Binti Mustafa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 14(7) 996-1001 2019年07月 The authors have been developing a new measurement method for measuring partial discharge (PD) in a ... [査読有り]

Improvement of sensitivity of ultrasonic beam induced resistance change (SOBIRCH) method with ultrasound resonance in mold resin
Takuto Matsui,Kosuke Tatsumi,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Shigeru Eura,Toru Matsumoto
Proceedings of the International Symposium on the Physical and Failure Analysis of Integrated Circuits, IPFA 2019年07月 In some cases of failure analysis of semiconductor devices, package state analysis without mold deca... [査読有り]

Development of Partial Discharge Measuring Method for Long-Distance Cable Line
Nhet Ra,Nur Sabihah Binti Mustafa,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi
電気学会論文誌A 139(7) 0-0 2019年07月 [査読有り]

Partial discharge measurement for power cable under different installation conditions and fabrication of simple monitoring device
Nhet Ra,N. Sabihah,T. Kawashima,Y. Murakami,N. Hozumi
AIP Conference Proceedings 2067 2019年01月 Partial discharge (PD) is considered as one of the major problem which harms the insulation of power... [査読有り]

Assessment of electrical insulation performance of cryogenic fluids using partial discharge waveform
K. Yamada,T. Kawashima,T. Obana,Y. Murakami,M. Nagao,N. Hozumi
The 28th International Toki Conference on Plasma and Fusion Research, Gifu, Japan 2019年 [査読有り]

AC dissipation current of dielectric material at high electric field in cryogenic
T. Kawashima,K. Yamada,Y. Murakami,M. Nagao,N. Hozumi
28th International Toki Conference on Plasma and Fusion Research, Gifu, Japan P2-72 2019年 [査読有り]

Treeing Breakdown Property in Epoxy/TiO2 Nanocomposites
N. Kodama,D. Yamada,T. Kawashima,N. Hozumi,Y. Murakami,S. Yoshida,T. Umemoto,T. Mabuchi,H. Muto
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Richland, USA 123-126 2019年 [査読有り]

Ultrasonic beam induced resistance change (SOBIRCH) method for failure analysis of semiconductor devices encapsulated by mold resin
Takuto Matsui,Kosuke Tatsumi,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Sigeru Eura,Toru Matsumoto
Japanese Journal of Applied Physics 58(SG) SGGB03-SGGB03 2019年 In the process of the failure analysis for semiconductor devices, various optical methods are applie... [査読有り]

中空シリカの添加がエポキシ樹脂の基礎電気特性に与える影響
村上義信,松原貴幸,川島朋裕,穂積直裕
電気学会論文誌 A 139(9) 387-392 2019年

Polymeric insulating materials like an epoxy resin due to their excellent electric performance an... [査読有り]

繰り返しインパルス電圧が絶縁体-空気ギャップ複合絶縁系の部分放電開始電圧に与える影響
川島朋裕,高萩秀幸,穂積直裕,村上義信
電気学会論文誌 A 139(5) 253-258 2019年

Inverter driving motors became more popular from the viewpoint of efficiency and controllability.... [査読有り]

Electrical Breakdown Characteristics of Epoxy/Hollow Silica Composite Materials
T. Matsubara,T. Kawashima,N. Hozumi,Y. Murakami
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2018-October 586-589 2018年10月 Additives and fillers are traditionally added into an epoxy resin to improve the mechanical and ther... [査読有り]

Conductor Temperature Estimation in Full Size Cable by PEA Method
Trinurkalid Sumarwoto,S. Morita,T. Kawashima,N. Hozumi,Suwarno
2018 Conference on Power Engineering and Renewable Energy, Solo, Indonesia 2018年10月 Polymer insulated HVDC power cable is being employed for submarine transmission with long distance. ... [査読有り]

Influence of Silica Filler Particle Size in Epoxy Resins on the Electrical Treeing Characteristic
D.Yamada,D. Isshiki,T.Kawashima,N.Hozumi,Y. Murakami
2018 Annual Report. Conference on Electrical Insulation and Dielectric Phenomena USB-Memory 423-426 2018年10月 [査読有り]

Nonlinear distortion of AC dissipation current waveform and space charge in EVA film
Tomohiro Kawashima,Nhet Ra,Yuki Yamashita,Yoshinobu Murakami,Naohiro Hozumi,Kazuyuki Tohyama,Masayuki Nagao
IEEJ Transactions on Electrical and Electronic Engineering 13(7) 948-952 2018年07月 AC dissipation current waveform shows nonlinear distortion at AC high field, and this nonlinear dist... [査読有り]

Electrical treeing characteristics near multi-layer interface
Shinnosuke Abe,Tomohiro Kawashima,Masayuki Nagao,Naohiro Hozumi,Yoshinobu Murakami,Naruto Miyakawa,Hiroki Shiota,Takao Tsurimoto
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2017-October 741-744 2018年01月 To understand the electrical treeing properties at an interface, treeing breakdown tests are perform... [査読有り]

Three-dimensional Acoustic Impedance Imaging for Cultured Biological Cells
N. Hozumi,Nur Dalila Binti Jalaluddin,Thomas Tiong,T. Kawashima,Y. Murakami,S. Yoshida,K. Kobayashi
2018 IEEE International Ultrasonics Symposium, Kobe, Japan 2018-October 2018年 Acoustic microscope is a powerful tool for observation of biological matters. Non-invasive in-situ o... [査読有り]

nfluence of Silica Filler Particle Size in Epoxy Resins on the Electrical Treeing Characteristic
D. Yamada,D. Isshiki,T. Kawashima,N. Hozumi,Y. Murakami
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Cancun, Mexico 334-337 2018年 [査読有り]

Improved Performance of Silicon Rubber Insulation with Coal Fly Ash Micro Filler
T. Warisa,Y. Murakami,N. Hozumi,T. Kawashima,S. Manjang,I. Kitta
EPI International Journal of Engineering 1(2) 81-86 2018年 [査読有り]

Simulation of Partial Discharge Induced Electromagnetic Wave in Power Transformer
Nhet Ra,T. Kawashima,N. Hozumi,Y. Murakami,Umar Khayam,Suwarno
EPI International Journal of Engineering 1(1) 54-59 2018年 [査読有り]

吸水がエポキシ/窒化ホウ素コンポジット材料中の空間電荷形成に与える影響
村上義信,加藤広衣,川島朋裕,長尾雅行,穂積直裕,石川素美,脇本亨
電気学会論文誌 A 138(7) 394-399 2018年

To understand the electrical properties influenced by water absorption, the space charge measurem... [査読有り]

シリカ充填剤の粒径がエポキシ樹脂中の電気トリーイング特性に与える影響
山田大智,一色大地,川島朋裕,穂積直裕,村上義信
電気学会論文誌 A 138(5) 252-257 2018年

Polymeric insulating materials such as epoxy resin are commonly used to electric power equipment.... [査読有り]

Flashover inception voltage characteristic on polyimid surface under surge voltage application
Hiroaki Fujimoto,Tomohiro Kawashima,Masayuki Nagao,Naohiro Hozumi,Yoshinobu Murakami
Proceedings of the International Symposium on Electrical Insulating Materials 2 585-588 2017年12月 To understand the flashover characteristics on polyimide (PI) surface, the flashover inception volta... [査読有り]

Study on short time charge behavior in pulsed residual charge method for water tree diagnostics of XLPE cables
Hiroyuki Futami,Nhet Ra,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Takashi Kurihara,Tatsuki Okamoto,Kazuhisa Miyajima,Katsumi Uchida
Proceedings of the International Symposium on Electrical Insulating Materials 2 559-562 2017年12月 Water tree generated in insulation parts of the XLPE (Cross Linked Polyethylene) cable is concerned ... [査読有り]

Influence of filler orientation and molding temperature on electrical and thermal properties of PMMA/h-BN composite material produced by electrostatic adsorption method
Norikazu Hamasaki,Shuhei Yamaguchi,Shohei Use,Tomohiro Kawashima,Hiroyuki Muto,Masayuki Nagao,Naohiro Hozumi,Yoshinobu Murakami
Proceedings of the International Symposium on Electrical Insulating Materials 2 485-488 2017年12月 The electrostatic adsorption method can be used to produce composite materials with an arbitrary str... [査読有り]

Partial discharge inception voltage under positive surge voltage application influenced by surface charge on polyimide film
Tomohiro Kawashima,Hideyuki Takahagi,Ryoto Kubota,Yoshinobu Murakami,Naohiro Hozumi,Masayuki Nagao
Proceedings of the International Symposium on Electrical Insulating Materials 1 163-166 2017年10月 Inverter-fed motors is increasing from points of view of efficiency and controllability of power equ... [査読有り]

Study on charge dynamics in water-Tree XLPE insulation for deterioration diagnosis
Nhet Ra,Hiroyuki Futami,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Takashi Kurihara,Tatsuki Okamoto
Proceedings of the International Symposium on Electrical Insulating Materials 1 343-346 2017年10月 Water tree is one of the most significant mode of degradation of XLPE insulation cables which leads ... [査読有り]

Development of the new partial discharge measuring method and device for long power cable using foil electrode
Nhet Ra,Nur Sabihah Binti Mustafa,Hiroyuki Futami,Tomohiro Kawashima,Yoshinobu Murakami,Naohiro Hozumi,Toshihiro Takahashi
Proceedings of the International Symposium on Electrical Insulating Materials 1 347-350 2017年10月 Partial discharge (PD) measurement is one of the most significant method for assessing the insulatio... [査読有り]

Preparation of Exoergic Insulating Composite Material Using Electrostatic Adsorption Model
Atsuhiro Fujii,Shou Hirota,Yoshinobu Murakami,Hiroyuki Muto,Tomohiro Kawashima,Kunihiro Tajiri,Hiroki Shiota,Takao Tsurimoto,Masayuki Nagao
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) 199(1) 3-10 2017年04月 To understand the properties of composite insulating materials, dc breakdown testing and the thermal... [査読有り]

Influence of charge behavior on breakdown strength of kraft paper in liquid nitrogen
Tomohiro Kawashima,Yuta Kitagawa,Yoshinobu Murakami,Naohiro Hozumi,Masayuki Nagao
Proceedings - 2016 International Electronics Symposium, IES 2016 234-237 2017年02月 High temperature superconducting cable (HTS cable) is expected as one of the solution to deal with t...

Effect of Interfacial Condition between Film and Earthed Electrode on Space Charge Measurement
Yoshinobu Murakami,Tomohiro Kawashima,Naohiro Hozumi,Masayuki Nagao,Masumi Fukuma
SENSORS AND MATERIALS 29(8) 1191-1198 2017年 One electrical insulation evaluation technology is the pulsed electroacoustic method, which detects ... [査読有り]

Preparation of Thermal Conductive PET/h-BN Electrical Insulating Composite Material Using by Electrostatic Adsorption Method
N. Hamasaki,S. Yamagchi,T. Kawashima,H. Muto,M. Nagao,Y. Murakami
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Fort Worth, USA 2017年 [査読有り]

Influence of PMMA and h-BN Particles Sizes on Electrical and Thermal Properties of PMMA/h-BN Composite Materials Produced by Electrostatic Adsorption Method
S. Yamaguchi,N. Hamasaki,S. Use,T. Kawashima,H. Muto,M. Nagao,N. Hozumi,Y. Murakami
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Fort Worth, USA 2017-October 245-248 2017年 The electrostatic adsorption method can fabricate composite materials with an arbitrary structure. C... [査読有り]

Spark Discharge Inception Voltage under Surge Voltage Application Influenced by Air Gap Length
H. Takahagi,T. Kawashima,N. Hozumi,Y. Murakami
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Fort Worth, USA 2017-October 525-528 2017年 Inverter fed-motors in the industrial field are commonly used due to high controllability and high e... [査読有り]

鱗片状窒化ホウ素の配向が静電吸着法で作製したポリメタクリル酸メチル/窒化ホウ素コンポジット電気絶縁材料の電気特性および熱的特性に与える影響
村上義信,宇瀬尚平,山口修平,川島朋裕,武藤浩行,穂積直裕,長尾雅行
電気学会論文誌 A 137(4) 202-207 2017年

The thermal conductive plate in a device like power module for an automobile requires materials w... [査読有り]

ポリフェニレンサルファイド/炭酸カルシウムコンポジット絶縁材料の直流部分放電特性
川島朋裕,山田倫弘,村上義信,長尾雅行,尾崎想,春成武
電気学会論文誌 A 137(9) 536-541 2017年

To meet increasing demands miniaturization and high performance of power equipment, it is necessa... [査読有り]

試料の表面粗さがパルス静電応力法の電荷分布信号に与える影響
村上義信,加藤広衣,川島朋裕,長尾雅行,穂積直裕,石川素美,脇本亨
電気学会論文誌 A 137(7) 428-434 2017年

The pulsed electroacoustic (PEA) method is one of the useful electrical insulation evaluation tec... [査読有り]

Development of Thermal Conductive PMMA/BN Electric Insulating Composite Material Produced by Electrostatic Adsorption Method
S. Use,T. Kawashima,M. Nagao,Y. Murakami
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Toronto, Canada 2016-December 380-383 2016年12月 The electrostatic adsorption method can be used to produce composite materials with an arbitrary str... [査読有り]

Effects of Partial Discharge on DC Breakdown Characteristics of Paper-Ice Composite Insulation System in Liquid Nitrogen
T. Kawashima,Yup Pui San,Y. Murakami,N. Hozumi,M. Nagao
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Toronto, Canada 2016-December 235-238 2016年12月 Insulating paper-LN2 composite system has been used as insulating system the high temperature superc... [査読有り]

Electrical Breakdown Characteristics of Dielectric Elastomer under Various Conditions
S. Ishikawa,T. Kawashima,M. Nagao,Y. Murakami
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Toronto, Canada 2016-December 371-374 2016年12月 Dielectric elastomers have potential as materials for artificial muscle actuators due to their excel... [査読有り]

Preparation of thermal conducive insulating composite material using electrostatic adsorption method
Y. Murakami,T. Kawashima,N. Hozumi,M. Nagao
International Council on Large Electric Systems,2016 Paris Session 2016-August 1-4 2016年08月 The composite materials of an arbitrary structure can be produced using the electrostatic adsorption...

静電吸着法を用いた放熱性ポリメタクリル酸メチル/窒化ホウ素コンポジット絶縁材料の作製
宇瀬尚平,村上義信,武藤浩行,川島朋裕,長尾雅行
電気学会論文誌 A 136(4) 186-192 2016年 An electrostatic adsorption method can produce composite materials with an arbitrary structure. To d... [査読有り]

高粘度絶縁油中における絶縁紙の直流部分放電特性と電荷挙動
川島朋裕,大西浩樹,村上義信,長尾雅行
電気学会論文誌 A 136(7) 442-447 2016年 In long-distance DC submarine cables, insulating oil depletion phenomenon occurs due to limitations ... [査読有り]

部分放電に起因した回路電流からの放射電磁波強度に及ぼす線路容量の影響
川島朋裕,山田倫弘,竹内健司,村上義信,山田修一,長尾雅行
電気学会論文誌 A 136(7) 409-413 2016年 Electric power equipment currently plays an important role in social infrastructures. Partial discha... [査読有り]

Direct assembly of movable parts in a microchannel using a water-soluble sacrificial layer for biohybrid systems
M. Nagai,K. Tanizaki,T. Kawashima,T. Shibata
2014 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2014 2015年01月 Biohybrid systems have been investigated to perform tasks at the microscale because of high function...

MEMS-based dispenser array for selective immobilization of molecular recognition elements on bio-image sensor
M. Nagai,S. Soga,T. Miyamoto,T. Kawashima,T. Shibata
2014 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2014 2015年01月 Selective immobilization of molecular recognition elements on bio-image sensor permits detection of ...

絶縁体/空気ギャップ複合絶縁系における直流および交流部分放電開始電圧に及ぼす表面帯電の影響
川島朋裕,井上快勝,横見和也,村上義信,石田隆弘,長尾雅行
電気学会論文誌 A 135(4) 235-240 2015年 The electrical insulating materials in motors are exposed to higher electric field in improving thei...

静電吸着法を用いた放熱性コンポジット絶縁材料の作製
藤井敦啓,廣田翔,村上義信,武藤浩行,川島朋裕,田尻邦彦,塩田裕基,釣本崇夫,長尾雅行
電気学会論文誌 A 135(4) 217-222 2015年 To understand the properties of the composite insulating materials, DC breakdown test and the therma...