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Both high and low frequency relaxation oscillations have been observed in an argon capacitive discharge connected to a peripheral grounded chamber through a slot with dielectric spacers. The oscillations, observed from time-varying optical emission of the main discharge chamber, show, for example, a high frequency (46 kHz) relaxation oscillation at 100 mTorr, with an absorbed power near the peripheral breakdown, and a low frequency (2.7-3.7 Hz) oscillation, at a higher absorbed power. The high frequency oscillation is found to ignite a plasma in the slot, but usually not in the periphery. The high frequency oscillation is interpreted by using an electromagnetic model of the slot impedance, combined with the circuit analysis of the system including a matching network. The model is further developed by using a parallel connection of variable peripheral capacitance to analyse the low frequency oscillation. The results obtained from the model are in agreement with the experimental observations and indicate that a variety of behaviours are dependent on the matching conditions. 相似文献
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49≤Z≤53类钴离子3d9-3p53d10,3d9-3d84p跃迁谱线和振子强度的计算 总被引:1,自引:0,他引:1
用等电子序列高离化态离子能级△E随Zc的一般拟合公式,系统计算了中Z段49≤Z≤53类钴离子的能级,并给出了3d9-3p53d10,3d9-3d84p跃迁的波长和振子强度. 相似文献
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几种硝基苯类炸药在外电场作用下的分子特性 总被引:2,自引:0,他引:2
采用密度泛函理论中的B3LYP方法,在6-31G*水平上研究了外电场对一些硝基苯类炸药分子的总能量、偶极矩、分子轨道能级和前线轨道能量差等分子特性的影响;考察了在外电场作用下分子前线轨道能量差与炸药的电火花感度之间的关系.结果表明,在外电场作用下分子总能量降低,偶极矩增大、前线轨道能量差减小;分子前线轨道能量差与炸药的电火花感度之间几乎线性相关,且外电场对这种线性相关性无明显影响. 相似文献
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基于小波分析的指数衰减信号高斯脉冲成形滤波器,可以进一步表示为高斯函数及其导数的线性组合.以高斯函数及其导数的递归近似实现算法为基础,研究了基于小波分析的指数衰减信号高斯脉冲成形的递归近似实现算法.仿真指数衰减信号和实际采样指数衰减信号的高斯脉冲成形表明,递归近似高斯脉冲成形与直接卷积高斯脉冲成形符合得非常好,体现了基于小波分析的高斯脉冲成形的特点.研究成果为进一步研究高斯脉冲成形在数字芯片上的实现提供了必要的数字算法基础.
关键词:
高斯脉冲成形
递归实现
小波分析 相似文献
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用等电子序列高离化态离子能级△E随Zc的一般拟合公式,系统计算了中Z段49≤Z≤53类钴离子的能级,并给出了3d^9-3p^10,3d^10,3d^9-3d^84p跃迁的波长和振子强度。 相似文献
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CRITICAL SCALING THEORY OF GENERALIZED PHASE TRANSITION AND ITS UNIVERSALITY 总被引:9,自引:0,他引:9 下载免费PDF全文
Generalized phase transition (GPT) refers to the transition process of material systems from one steady-state to another. It includes equilibrium phase transition (EPT) and nonequilibrium phase transition (NPT), and phase transitions intermediate between them. In this paper some results on the study of critical scaling relations of the NPT and EPT are obtained. We developed the critical scaling theory of EPT and advanced a universal critical scaling theory of GPT. The critical scaling relations(scaling laws) has more niversality. The critical exponents calculated from our theory are identical with the results of experiments and other theories about EPT and NPT systems. Because the basic model of the theory does not depend on the concrete material system, it has a certain unversality. Its results thus can be applied to generlized phase transition systems, such as the electrorheological fluid and magnetorheological fluid systems. 相似文献