A stable glow plasma at atmospheric pressure has been achieved for treatment under selected conditions, example the structure of electrodes, kind dilute gas, and frequency power. The surface fluorination PET film carbon thin-film deposition by such a is described here. energy can be controlled various concentrations (O2/CF4/He) in same way as lower method that reported Kogoma co-workers (1987). Active species are identified emission spectroscopy.

The hydroxyl radical (OH) plays an important role in plasma chemistry at atmospheric pressure. OH radicals have a higher oxidation potential compared with other oxidative species such as free O, atomic oxygen, hydroperoxyl (HO2), hydrogen peroxide(H2O2) and ozone. In this study, surface discharges on liquids (water its solutions) were investigated experimentally. A pulsed streamer discharge was generated the liquid using point-to-plane electrode geometry. primary generation process of is...

Recently the authors developed an atmospheric-pressure glow discharge plasma method which can be applied to surface treatment and deposition on insulating surfaces for purposes of large-scale system treatment. However, this was not able treat metallic substrates. Consequently, they have improved upper electrode enable metal substrates treated. Some organic films were polymerised by method. Comparison results from with those obtained low-pressure showed no differences in chemical structures...

The aim of this study was to clarify the initiation process and propagation mechanism positive underwater streamers under application pulsed voltage with a duration 10 μs, focusing on two different theories electrical discharges in liquids: bubble theory direct ionization theory. process, which is time lag from beginning streamer inception, found be related In Joule heating resulted formation cluster at tip needle electrode. Streamer inception observed protrusion surface cluster, acted as...

The effects of additional gas composition on the corona discharge characteristics in a pipe with nozzle electrode system and NOx removal for flue gases are experimentally investigated. consists mixture Na+O/sub 2/+NH/sub 3/ small amount Ar or CO/sub 2/, is introduced to stream from through discharging zone at tip nozzles. results show that modes significantly influenced by mixture. Both NO/sub x/ reduction rate energy yield increase decreasing input power. NO can be optimized type flow...

In order to improve ozone generation, a new type of ozonizer is proposed, where silent discharge and surface are generated in the separated spaces at same time. As applied voltage increased, begins first from inner coil electrode, then occurs gap between glass wall outer cylindrical electrode. It observed that enhanced generation by increases when on electrode becomes active. Hence, improved up 110 g/kWh case N/sub 2/+O/sub 2/ mixture as test gas 274 oxygen gas.

NdFeB sintered magnets are widely used in rotating electrical machines. In order to develop an efficient machine, it is important estimate ac loss of the permanent magnet rotor precisely. this paper, losses IEEJ model (surface permanent-magnet motor model) examined by using three-dimensional finite-element method taking into account newly measured hysteresis magnet. The result shows that we should consider not only eddy-current but also loss, when frequency field due a slot ripple several...

Currently, further clarification of pre-breakdown phenomena in water such as propagation mechanisms primary and secondary streamers are needed because applications aqueous plasma to environmental medical treatments increasing. In this study, a series streamer propagations ultrapure was visualized at 100-Mega frames per second (100 Mfps) the range 400 μm square using an ultra high-speed camera with microscope lens when single-shot pulsed positive voltage applied needle electrode placed quartz...

In order to improve ozone generation, a new type of ozonizer is proposed, where silent discharge and surface are generated in the separated spaces at same time. As applied voltage increased, begins first from inner coil electrode; then occurs gap between glass wall outer cylindrical electrode. It observed that enhanced generation by increases when on electrode becomes active. The improved up 110 g/kWh for an N/sub 2/+O/sub 2/ mixture as material gas 274 oxygen gas.< <ETX...

In this paper, the effects of flue gas flow rate and seed on dynamics corona discharge current-voltage characteristics NO/sub x/ removal are experimentally investigated for a radical shower system. The have two operating modes which significant influence characteristics, where threshold value treatment to ratio is about 8. hysteresis observed in For longer operational time, current significantly changes with time. When operation apparatus starts at relatively low applied voltage, under...

In this paper, the effects of applied voltage modes on positive corona discharge morphology and NO removal characteristics from air streams are experimentally investigated. By using a DC superimposed high frequency AC power supply (10-60 kHz), uniform streamer can be generated, which is also less sensitive to electrode mis-arrangements. Hermstein glow he transferred if peak-to-peak larger than 1.0 kV at change rate 0.2 kV//spl mu/s. A significant amount observed under corona. For glow,...

Atmospheric-pressure-plasma nitriding of titanium alloy Ti–6Al–4V has been achieved by using a pulsed-arc plasma jet with N2/H2 gas mixture, where the plume is sprayed onto surface under atmospheric pressure. We successfully formed nitride layer on sample surface. Moreover, diffusion was also formed, hardness which increased from that as-received titanium. The growth found to be diffusion-controlled, as in other conventional methods.