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The barrier effect is well known to increase the breakdown voltage of air gap. While, previous research has suggested that the occurrence of secondary discharge at the underside of barrier accompanied by the development of upper surface corona discharge on the barrier contributes to the reduction of the barrier effect. The properties of the underside discharge are, however, still not well understood...
This study presents an experimental method of determining a two-dimensional image of the gas temperature in atmospheric DC glow corona by spectral imaging. A steady-state glow corona discharge as a partial discharge was generated by applying positive DC voltage to rod-to-plane electrode in synthetic air (N2:79%, O2:21%) at atmospheric pressure. Spectral imaging displays an image, and measures its...
The process conditions for improving the electrical properties of carbon nanotubes (CNTs) were investigated by using a blanket-structure method for quantifying CNT resistance independently. The growth mechanism of CNTs formed with two different gas precursors was investigated from the viewpoint of crystallinity, growth-length uniformity, and resistance. Although the formed CNTs still require further...
The effect of CO2 concentration on discharge characteristics in atmospheric air was investigated under nonuniform DC field gap. In the experiment, positive DC voltage was applied to 2.0 cm of needle-plane gap in air with CO2 at atmospheric pressure. As a result, a drastic decrease of the withstand voltage of air caused by a dilute increase of CO2 concentration was confirmed. In addition, it was observed...
For measurement of spatial distribution of epithermal neutron source in BNCT, we propose an epithermal neutron camera based on a gas electron multiplier (GEM) and the filter that has a resonance in epithermal energy region. A prototype detector that consisted of GEM with a neutron to charged particle converter of 10B and a resonance filter of Ag was constructed. Difference in the response function...
Pulsed streamer discharge plasmas, one type of nonthermal plasma, have been used to treat exhaust gases. Since a pulsewidth of applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short-pulse generator is of paramount importance for practical applications. In this paper, a nanosecond (ns) pulse generator which has a 5-ns pulse duration...
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