Xiao-qiong Wen

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An atmospheric-pressure plasma jet generated by a sinusoidal power input of tens of kilohertz and designed with a concentric wire-mesh cylinder electrode is characterized in this paper. Effects of gas flow rate on the length of plasma jet have been investigated, and the plasma jet is seen to have three different modes varied with the gas flow. The jet(More)
Recently, the diagnosis of the characteristic of pulsed underwater electrical discharges plasma have received significant attention. The measurement of a time-spatial resolved spectrum emitted from a single discharge pulse is important for understanding the time-spatial evolution characteristics of plasma generated by a pulsed high-voltage discharge in(More)
Optical emission spectroscopy method was used to diagnose the normal dc glow discharge plasma generated inside a metallic tube. The active species in the plasma were identified. The electron excitation temperature in the plasma was determined by the Boltzmann plot method. The vibrational temperature of N2 molecules in the plasma was determined by analyzing(More)
OBJECTIVE To investigate the chemical constituents of the roots of Berchemia lineate as a medicinal plant of Yao nationality in China. METHODS Compounds were isolated by various column chromatography and elucidated by physicochemical and spectral analysis. RESULTS Nine compounds were isolated from the 95% ethanol extract of the roots of Berchemia(More)
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