An atmospheric-pressure argon plasma jet with screw ring-ring electrodes in surface dielectric barrier discharge is generated by a sinusoidal excitation voltage at 8 kHz. The discharge characteristics, such as rotatio...An atmospheric-pressure argon plasma jet with screw ring-ring electrodes in surface dielectric barrier discharge is generated by a sinusoidal excitation voltage at 8 kHz. The discharge characteristics, such as rotational and vibrational temperature of nitrogen, electronic excitation temperature, oxygen atomic density, nitrogen molecular density, and average electron density, are estimated. It is found that the rotational temperature of nitrogen is in the range of 352 ～ 392 K by comparing the simulated spectrum with the measured spectrum at the C3Πu → B3Πg （△ν = 2） band transition, the electronic excitation temperature is found to be in the range of 3127 ～ 3230 K by using the Boltzmann plot method, the oxygen atomic and nitrogen molecular density are of the order of magnitude of 1016 cm-3 by the actinometry method, and the average electron density is of the order of magnitude of 1012 cm-3 by the energy balance equation. Besides, the effective power, conduction, and displacement current are measured during the discharge.展开更多
为比较激素电极、靶头电极和螺旋电极的慢性阈值,并探讨其优缺点,对激素电极(26条)、靶头电极(14条)和螺旋电极(20条)的慢性阈值进行了观察。60条电极与单腔或双腔起搏器均系同一公司生产。为提高可比性,仅有5.0 V 电压输出的起搏器不...为比较激素电极、靶头电极和螺旋电极的慢性阈值,并探讨其优缺点,对激素电极(26条)、靶头电极(14条)和螺旋电极(20条)的慢性阈值进行了观察。60条电极与单腔或双腔起搏器均系同一公司生产。为提高可比性,仅有5.0 V 电压输出的起搏器不作观察对象。激素电极、非激素电极分别随访18(3～60)和64(3～122)月。结果显示2.5 V 时激素电极的慢性脉宽阈值(0.07±0.03 ms)低于靶头电极(0.11±0.05 ms),后者又低于螺旋电极(0.25±0.13 ms),P 均<0.01。全部病例心房和心室感知均良好。电压输出均采用2.5 V,激素电极、靶头电极和螺旋电极起搏分别置脉宽输出于0.2,0.4和0.8 ms,则80%以上(分别为85%、86%及80%)的病例可达到能量阈值的3倍以上的安全范围。激素电极中有19条可置于1.6 V 和0.3 ms 起搏,其耗能仅为5.0V和0.5 ms(25μJ)的6.1%。即每个脉冲可节能93.9%,从而可延长起搏器的工作寿命。展开更多
基金supported by National Natural Science Foundation of China(No.51177007)Ministry of Science and Technology of China(No.2009AA064101-4)
文摘An atmospheric-pressure argon plasma jet with screw ring-ring electrodes in surface dielectric barrier discharge is generated by a sinusoidal excitation voltage at 8 kHz. The discharge characteristics, such as rotational and vibrational temperature of nitrogen, electronic excitation temperature, oxygen atomic density, nitrogen molecular density, and average electron density, are estimated. It is found that the rotational temperature of nitrogen is in the range of 352 ～ 392 K by comparing the simulated spectrum with the measured spectrum at the C3Πu → B3Πg （△ν = 2） band transition, the electronic excitation temperature is found to be in the range of 3127 ～ 3230 K by using the Boltzmann plot method, the oxygen atomic and nitrogen molecular density are of the order of magnitude of 1016 cm-3 by the actinometry method, and the average electron density is of the order of magnitude of 1012 cm-3 by the energy balance equation. Besides, the effective power, conduction, and displacement current are measured during the discharge.
文摘为比较激素电极、靶头电极和螺旋电极的慢性阈值,并探讨其优缺点,对激素电极(26条)、靶头电极(14条)和螺旋电极(20条)的慢性阈值进行了观察。60条电极与单腔或双腔起搏器均系同一公司生产。为提高可比性,仅有5.0 V 电压输出的起搏器不作观察对象。激素电极、非激素电极分别随访18(3～60)和64(3～122)月。结果显示2.5 V 时激素电极的慢性脉宽阈值(0.07±0.03 ms)低于靶头电极(0.11±0.05 ms),后者又低于螺旋电极(0.25±0.13 ms),P 均<0.01。全部病例心房和心室感知均良好。电压输出均采用2.5 V,激素电极、靶头电极和螺旋电极起搏分别置脉宽输出于0.2,0.4和0.8 ms,则80%以上(分别为85%、86%及80%)的病例可达到能量阈值的3倍以上的安全范围。激素电极中有19条可置于1.6 V 和0.3 ms 起搏,其耗能仅为5.0V和0.5 ms(25μJ)的6.1%。即每个脉冲可节能93.9%,从而可延长起搏器的工作寿命。
