Naoki Hayakawa

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Measurements of electrolytic deuterium loading into Pd and Pd-Rh alloy cathodes and excess heat during electrolysis in 1M LiOD have been conducted simultaneously in closed cells with a fuel cell anode pressurized by deuterium gas. The excess heat up to 4-5W/Pd cc has been reproduced by using Pd rod cathodes from various sources. Excess heat increases with(More)
An understanding of mechanism of Partial Discharge (PD) in SF 6 gas is critical for diagnosis of PD in electric power equipment. Moreover, analysis of PD mechanism contributes to the optimization of the design of electric power applications. For these reasons, we study in detail about PD mechanism by measuring light emission spectrum of PD in SF 6 gas. In(More)
Recently, there are an increasing number of developing wearable devices that intent to display various contents. As can be seen in sign languages and hand signals, hand gestures can express rich information with small motions, therefore, they are useful input for those devices. Especially, these gestures are less obtrusive actions than other actions such as(More)
In epoxy spacers in Gas Insulated Switchgear (GIS) under operating thermal or mechanical stresses, delamination would be initiated at electrode/epoxy interface leading to partial discharge (PD) activity. In this paper, PD activity for delamination at electrode/epoxy interface in SF<inf>6</inf> gas is measured and analyzed to clarify the effect of(More)
For the application of nanocomposite materials to solid insulator in electric power apparatus, we investigated the influence of the dispersibility of nanoparticles on dielectric property. Experiments were carried out in epoxy/alumina nanocomposites with the particle dispersion techniques using ultrasonic wave and centrifugal force. As the result, we(More)
characteristics as a stochastic process and its integral equation under sinusoidal voltage," IEEE Transactions on Dielectrics & Electrical Insulation, vol. 8, pp.A novel technique for detecting electromagnetic wave caused by partial discharge in GIS," IEEE characteristics and diagnostics technology for metallic particles in gas insulated switchgear," vol.
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