平井 直志

主任研究員(研究院准教授)

  • 635 引用
  • 13 h指数
1993 …2019
Pureに変更を加えた場合、すぐここに表示されます。

研究成果 1993 2019

  • 635 引用
  • 13 h指数
  • 63 Conference contribution
  • 33 Article
  • 1 Chapter
  • 1 Comment/debate
フィルター
Article
2019
Flame retardants
Nuclear power plants
Polyethylenes
Aging of materials
Permittivity
1 引用 (Scopus)
Propylene
Accidents
Rubber
Ethylene
Cables
公開
Infrared absorption
Low density polyethylenes
Antioxidants
Absorption spectra
Absorption spectroscopy
1 引用 (Scopus)

Degradation mechanisms of silicone rubber under different aging conditions

Kaneko, T., Ito, S., Minakawa, T., Hirai, N. & Ohki, Y., 2019 10 1, : : Polymer Degradation and Stability. 168, 108936.

研究成果: Article

silicone rubber
Silicone Elastomers
Silicones
Rubber
Aging of materials
1 引用 (Scopus)
Low density polyethylenes
Polyethylene
Phenol
Antioxidants
Phenols
Nuclear power plants
Insulation
Accidents
Cables
Steam
Coaxial cables
Fast Fourier transforms
Cables
Low density polyethylenes
Heating
公開
fillers
nanocomposites
epoxy resins
absorption spectra
polymers
2018
2 引用 (Scopus)
Cables
Electric cables
Degradation
Fast Fourier transforms
Polymers
6 引用 (Scopus)
Terahertz spectroscopy
Insulating materials
antioxidants
Antioxidants
Absorption spectroscopy
2 引用 (Scopus)
Cables
Low density polyethylenes
Polymers
Coaxial cables
Electric network analyzers
2017
6 引用 (Scopus)
Polyether ether ketones
ketones
Gamma rays
Dielectric properties
dielectric properties

Experimental investigation of the degradation mechanism of silicone rubber exposed to heat and gamma rays

Hanada, S., Miyamoto, M., Hirai, N., Yang, L. & Ohki, Y., 2017 6, : : High Voltage. 2, 2, p. 92-101 10 p.

研究成果: Article

公開
Gamma rays
Silicones
Rubber
Degradation
Mechanical properties
2016
7 引用 (Scopus)
flame retardants
Scanning probe microscopy
dienes
Flame retardants
propylene
9 引用 (Scopus)
Spectroscopic analysis
Propylene
Ethylene
Permittivity
Copolymers
17 引用 (Scopus)
Cable cores
Insulation
Cables
Polyvinyl chlorides
Coaxial cables
Organic polymers
Photoluminescence
Fluorescence
Photons
Polyolefins
2 引用 (Scopus)
Propylene
Ethylene
Copolymers
Irradiation
Oxidation
2013
4 引用 (Scopus)
Fourier transforms
Cables
Degradation
Insulation
Electric cables
20 引用 (Scopus)
Cables
Polymers
Telecommunication cables
Temperature
Coaxial cables
2012
4 引用 (Scopus)
Fourier transforms
Cables
Degradation
Insulation
Electric cables
2009
2 引用 (Scopus)

Partial discharge degradation of several biodegradable polymers

Fuse, N., Fujita, S., Hirai, N., Tanaka, T., Kozako, M., Kohtoh, M., Okabe, S. & Ohki, Y., 2009 7 30, : : Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi). 168, 2, p. 1-10 10 p.

研究成果: Article

Biodegradable polymers
Partial discharges
Low density polyethylenes
Degradation
Lactic acid
2008
58 引用 (Scopus)

Dielectric properties of epoxy/clay nanocomposites -effects of curing agent and clay dispersion method

Tagami, N., Okada, M., Hirai, N., Ohki, Y., Tanaka, T., Imai, T., Harada, M. & Ochi, M., 2008 2, : : IEEE Transactions on Dielectrics and Electrical Insulation. 15, 1, p. 24-32 9 p.

研究成果: Article

Dielectric properties
Curing
Amines
Nanocomposites
Clay
2007
38 引用 (Scopus)
Biodegradable polymers
Lactic acid
Polycaprolactone
Polyethylene terephthalates
Low density polyethylenes
12 引用 (Scopus)

Partial discharge degradation of several biodegradable polymers

Fuse, N., Fujita, S., Hirai, N., Tanaka, T., Kozako, M., Kohtoh, M., Okabe, S. & Ohki, Y., 2007, : : IEEJ Transactions on Fundamentals and Materials. 127, 8

研究成果: Article

Biodegradable polymers
Partial discharges
Low density polyethylenes
Degradation
Lactic acid
2005
21 引用 (Scopus)

Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid

Maeno, Y., Yamaguchi, Y., Hirai, N., Ohki, Y., Tanaka, T., Tajitsu, Y., Kohtoh, M. & Okabe, S., 2005, : : IEEJ Transactions on Fundamentals and Materials. 125, 3, p. 254-260 7 p.

研究成果: Article

Lactic acid
Glass transition
Depolarization
Short circuit currents
Fourier transform infrared spectroscopy
53 引用 (Scopus)
Electric space charge
Crosslinking
Byproducts
Polyethylenes
Low density polyethylenes
2004
2 引用 (Scopus)
Insulation
Monitoring
Fiber optics
Personnel
Costs
2003
36 引用 (Scopus)

Chemical group in crosslinking byproducts responsible for charge trapping in polyethylene

Hirai, N., Minami, R., Tanaka, T., Ohki, Y., Okashita, M. & Maeno, T., 2003 4, : : IEEE Transactions on Dielectrics and Electrical Insulation. 10, 2, p. 320-330 11 p.

研究成果: Article

Charge trapping
Electric space charge
Crosslinking
Byproducts
Polyethylenes
2002
6 引用 (Scopus)
Linear low density polyethylenes
Dielectric properties
Low density polyethylenes
Electric breakdown
Crosslinking
1998
1 引用 (Scopus)
mineral oils
Mineral oils
impulses
time lag
breakdown
1996
Dielectric liquids
Electric charge
Charge distribution
electric charge
elastic waves