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Y. Ohki · SciRah

Researcher profile · Semantic Scholar

Y. Ohki

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Y. Ohki — researcher profile on SciRah

h-index: 47
Works: 656
Citations: 12K

Most-cited papers

Degradation mechanisms of silicone rubber under different aging conditions
T. Kaneko, S. Ito, T. Minakawa, N. Hirai +1 more
2019Polymer degradation and stability121 citations
Semantic Scholar
Surface flashover in 50 years: Theoretical models and competing mechanisms
Zhuguo Li, Ji Liu, Y. Ohki, George Chen +2 more
2023High Voltage112 citations Open access
Semantic Scholar
Broadband Complex Permittivity and Electric Modulus Spectra for Dielectric Materials Research
Y. Ohki
2022IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING77 citations Open access
Semantic Scholar
Effects of gamma irradiation on the degradation of silicone rubber by steam exposure
S. Ito, Yuya Miyazaki, N. Hirai, Y. Ohki
2020Journal of Nuclear Science and Technology27 citations
Semantic Scholar
Effects of interaction between filler and resin on the glass transition and dielectric properties of epoxy resin nanocomposites
Keigo Mori, N. Hirai, Y. Ohki, Yasutomo Otake +2 more
2019IET Nanodielectrics25 citations Open access
Semantic Scholar
Effects of Heat and Gamma-rays on Mechanical and Dielectric Properties of Cross-linked Polyethylene
Yuya Miyazaki, N. Hirai, Y. Ohki
2020IEEE transactions on dielectrics and electrical insulation24 citations
Semantic Scholar
Thermal ageing of soft and hard epoxy resins
Y. Ohki, N. Hirai
2022High Voltage23 citations Open access
Semantic Scholar
Aging Behavior of Flame-retardant Cross-linked Polyolefin under Thermal and Radiation Stresses
Hao-Long Zhou, Wakana Hanafusa, Keigo Udo, N. Hirai +1 more
2021IEEE transactions on dielectrics and electrical insulation21 citations
Semantic Scholar
Degradation of Soft Epoxy Resin for Cable Penetrations Induced by Simulated Severe Accidents
Y. Ohki, Hiroyuki Ishii, N. Hirai
2021Energies21 citations Open access
Semantic Scholar
Comparison of the effects of heat and gamma irradiation on the degradation of cross‐linked polyethylene
Zi-Yang Liu, Yuya Miyazaki, N. Hirai, Y. Ohki
2019IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING21 citations Open access
Semantic Scholar
Rejuvenation of retired power cables by heat treatment
Yue Xie, Gang Liu, Yi-Feng Zhao, Li-Cheng Li +1 more
2019IEEE transactions on dielectrics and electrical insulation21 citations
Semantic Scholar
Degradation of Mechanical and Dielectric Properties of Flame‐Retardant Ethylene Propylene Rubber by Thermal Aging
Hikaru Yamaguchi, Hiroyuki Ishii, N. Hirai, Y. Ohki
2020IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING16 citations
Semantic Scholar
Degradation of flame‐retardant ethylene‐propylene‐diene rubber by radiation and steam
Jiayi You, Hikaru Yamaguchi, Hiroyuki Ishii, N. Hirai +1 more
2020IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING15 citations
Semantic Scholar
How to Install TEMPO in Dielectric Polymers-Their Rational Design toward Energy-Storable Materials.
Yang Feng, T. Suga, H. Nishide, Y. Ohki +2 more
2018Macromolecular rapid communications15 citations
Semantic Scholar
Comparison of degradation behavior between soft and hard epoxy resins
Hiroyuki Ishii, N. Hirai, Y. Ohki
202014 citations
Semantic Scholar
Terahertz absorption spectra of several polymer nanocomposites indicating polymer-filler interactions
Keigo Mori, Tomofumi Seki, N. Hirai, Y. Ohki
2019AIP Advances13 citations Open access
Semantic Scholar
Terahertz spectroscopic estimation of crystallinity of poly(phenylene sulfide)
Chisato Azeyanagi, Y. Ohki
201813 citations
Semantic Scholar
Identification of antioxidants in polymeric insulating materials by terahertz absorption spectroscopy
T. Kozai, T. Kaneko, N. Hirai, Y. Ohki
201813 citations Open access
Semantic Scholar
Aging behavior of flame‐retardant cross‐linked polyethylene in nuclear power plant environments
Zhenyu Yang, T. Kaneko, N. Hirai, Y. Ohki
2019IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING12 citations
Semantic Scholar
Penetration Routes of Oxygen and Moisture into the Insulation of FR-EPDM Cables for Nuclear Power Plants
Y. Ohki, N. Hirai, S. Okada
2022Polymers11 citations Open access
Semantic Scholar
Various Characteristics of Severely Aged Flame‐Retardant Cross‐Linked Polyolefin
Hao-Long Zhou, N. Hirai, Y. Ohki
2021IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING11 citations
Semantic Scholar
Facile Synthesis of Isotactic Polyacrylonitrile via Template Polymerization in Interlayer Space for Dielectric Energy Storage
Yu Wang, R. Nakamura, T. Suga, Sheng-Tao Li +3 more
202011 citations
Semantic Scholar
Degradation of Flame-Retardant Cross-Linked Polyethylene Caused by Heat, Gamma-rays, and Steam
Y. Ohki, N. Hirai
2022IEEE Access10 citations Open access
Semantic Scholar
Effects of metal content on electrical and physical properties in solution-processed IGZO thin films
Takaaki Morimoto, Yicheng Yang, Y. Ochiai, Nobuko Fukuda +1 more
202010 citations
Semantic Scholar
Improvement of electrical insulation performance of silicone rubber cables due to exposure to heat and radiation
Y. Ohki, N. Hirai, Yasuhiro Tanaka
2023Journal of Applied Polymer Science9 citations
Semantic Scholar
Reasons for Resistivity Increase in FR‐EPDM Insulation of Cables Aged in Nuclear Power Plants
Y. Ohki, N. Hirai, Kosuke Sato, Yasuhiro Tanaka
2023IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING9 citations
Semantic Scholar
Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites
Emiri Nagase, T. Iizuka, K. Tatsumi, N. Hirai +4 more
2020IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING8 citations Open access
Semantic Scholar
Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis
Takaaki Ogishima, Chiaki Kuroda, N. Hirai, Y. Ohki
2019High Voltage8 citations Open access
Semantic Scholar
Identification and quantification of phenol-type antioxidants in low-density polyethylene by broadband far-infrared spectroscopy
Takaaki Ogishima, Chiaki Kuroda, N. Hirai, Y. Ohki
2019Polymer testing7 citations
Semantic Scholar
Development of an XLPE-insulated cable for LCC-HVDC power lines [News from Japan]
Y. Ohki
2018IEEE Electrical Insulation Magazine7 citations
Semantic Scholar
Dielectric properties of nanocomposites based on epoxy resin and HBP/plasma modified nanosilica
Guo-Qing Yang, Jiaxin Li, Y. Ohki, De-Yi Wang +3 more
2020AIP Advances6 citations Open access
Semantic Scholar
Development of a dielectrophoresis-assisted surface plasmon resonance fluorescence biosensor for detection of bacteria
Chiaki Kuroda, Ryota Iizuka, Y. Ohki, M. Fujimaki
20186 citations Open access
Semantic Scholar
Effects of ultraviolet photon irradiation and subsequent thermal treatments on solution-processed amorphous indium gallium zinc oxide thin films
Y. Takamori, Takaaki Morimoto, Nobuko Fukuda, Y. Ohki
2018AIP Advances6 citations Open access
Semantic Scholar
Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions
T. Minakawa, M. Ikeda, N. Hirai, Y. Ohki
2018Conference on Electrical Insulation and Dielectric Phenomena6 citations
Semantic Scholar
Inverse Proportionality of Thermal Conductivity and Complex Permittivity to Filler-Diameter in Epoxy Resin Composites with Silica
Y. Ohki, N. Hirai, T. Umemoto, H. Muto
2021Journal of Composites Science5 citations Open access
Semantic Scholar
Spatial Resolution between Two Abnormalities in a Cable by Frequency Domain Reflectometry
Y. Ohki, N. Hirai
2021IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING5 citations
Semantic Scholar
Mitigation of Degradation in Polymers by Gamma Rays
Y. Ohki, Yuya Miyazaki, Hao-Long Zhou, Momoka Sumita +2 more
2021IEEE International Conference on Properties and Applications of Dielectric Materials4 citations
Semantic Scholar
Numerical evaluation of complex permittivity of silicone rubber based on Jonscher's law
Zhenyu Yang, S. Ito, N. Hirai, Y. Ohki
2020IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING4 citations
Semantic Scholar
Evaluation of Aging Status of Flame-retardant Cross-linked Polyethylene by Measuring Indenter Modulus
Zhenyu Yang, N. Hirai, Y. Ohki
2019International Conference on Electrical Materials and Power Equipment4 citations
Semantic Scholar
Pros and Cons of THz and Far-infrared Absorption Spectroscopy for Dielectric Materials Research
Y. Ohki, N. Hirai
2021IEEJ Transactions on Fundamentals and Materials3 citations
Semantic Scholar
Effects of Resin/Filler Adhesion on the Thermal and Electrical Conductivity of Polyimide Nanocomposites
Y. Ohki, N. Hirai
2021Journal of Composites Science3 citations Open access
Semantic Scholar
THz Spectroscopic Study of Degradation of Epoxy Resins
Y. Ohki, Hiroyuki Ishii, Mayu Hayashi, N. Hirai
2021International Conference on Electrical Materials and Power Equipment3 citations
Semantic Scholar
Experimental Verification of Good Spatial Resolution of Fault Location in a Cable by Frequency Domain Reflectometry
Y. Ohki, N. Hirai
2020IEEE International Conference on Condition Monitoring and Diagnosis3 citations
Semantic Scholar
Quantum chemical verification of identification of three phenol-type antioxidants by far-infrared absorption spectroscopy
Tomofumi Seki, K. Endo, N. Hirai, Y. Ohki
2020Japanese Journal of Applied Physics3 citations
Semantic Scholar
Aging State Analysis of Cables Insulated with Ethylene Propylene Diene Rubber Exposed to Simulated Severe Accident Conditions
T. Minakawa, M. Ikeda, N. Hirai, Y. Ohki
2019IEEJ Transactions on Fundamentals and Materials3 citations Open access
Semantic Scholar
Relation Between the Glass Transition and Dielectric Properties in Bisphenol A and F Epoxy Resins
Keigo Mori, N. Hirai, Y. Ohki, Yasutomo Otake +2 more
2019Conference on Electrical Insulation and Dielectric Phenomena3 citations
Semantic Scholar
Several Experimental Results Indicating Filler/Polymer Interactions in Polymer Nanocomposites
Y. Ohki, Ryosuke Yanashima, Chisato Azeyanagi, N. Hirai
2018IEEE International Conference on Dielectrics3 citations
Semantic Scholar
Terahertz spectroscopic analysis of crystal orientation in polymers
Chisato Azeyanagi, T. Kaneko, Y. Ohki
20183 citations
Semantic Scholar
Quantum Chemical and Spectroscopic Study on Hydrogen Bonds in Hairpin DNA
Y. Ohki, Tomofumi Seki, M. Mizuno
2021IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING2 citations
Semantic Scholar
Terahertz and Far-infrared Absorption Spectroscopic Study of DNA Bases
Tomofumi Seki, Y. Ohki, M. Mizuno
2020Conference on Electrical Insulation and Dielectric Phenomena2 citations
Semantic Scholar

Frequent co-authors

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N. Hirai×36
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N. Hirai — researcher profile on SciRah
Hiroyuki Ishii×5
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Hiroyuki Ishii — researcher profile on SciRah
T. Kaneko×4
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T. Kaneko — researcher profile on SciRah
Yuya Miyazaki×4
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Yuya Miyazaki — researcher profile on SciRah

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T. Umemoto — researcher profile on SciRah

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H. Muto — researcher profile on SciRah

Tomofumi Seki×4

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Tomofumi Seki — researcher profile on SciRah

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S. Ito — researcher profile on SciRah

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T. Minakawa — researcher profile on SciRah

Sheng-Tao Li×3

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Sheng-Tao Li — researcher profile on SciRah

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Keigo Mori — researcher profile on SciRah

Hao-Long Zhou×3

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Hao-Long Zhou — researcher profile on SciRah