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Low-frequency (2.72-3.70 Hz) relaxation oscillations at 100 mTorr at higher absorbed power were observed from time-varying optical emission of the main discharge chamber and the periphery. We interpret the low frequency oscillations using an electromagnetic model of the slot impedance with parallel connection variational peripheral capacitance, coupled to a circuit analysis of the system including the matching network. The model results are in general agreement with the experimental observations, and indicate a variety of behaviours dependent on the matching conditions. 相似文献
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第一,课本原有的充放电电路如图1所示,如用这个电路演示充放电过程,没有任何可以观察到的实验现象,因此难以令学生信服,何时充电、放电也无法得知. 相似文献
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《人工晶体学报》2016,(10):2466-2466
近日,中国科学院深圳先进技术研究院集成所功能薄膜材料研究中心研究员唐永炳及其研究团队在低成本、高效储能电池研究方面取得新进展。相关研究成果Carbon-Coated Porous Aluminum Foil Anode for High-Rate,Long-Term Cycling Stability and High Energy Density Dual-Ion Batteries(《基于碳包覆多孔铝箔负极的高倍率、长循环、高能量密度双离子电池》)在线发表于《先进材料》DOI:10.1002/adma.201603735),并申请1项国际发明专利(PCT/CN2016/081344). 相似文献
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Multi-walled carbon nanotubes (MWCNTs) are grown by arc discharge method in a controlled methane environment. The arc discharge is produced between two graphite electrodes at the ambient pressures of 100 tort, 300 torr, and 500 torr. Arc plasma parameters such as temperature and density are estimated to investigate the influences of the ambient pressure and the contributions of the ambient pressure to the growth and the structure of the nanotubes. The plasma temperature and density are observed to increase with the increase in the methane ambient pressure. The samples of MWCNT synthesized at different ambient pressures are analyzed using transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. An increase in the growth of MWCNT and a decrease in the inner tube diameter are observed with the increase in the methane ambient pressure. 相似文献
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在托卡马克装置中。等离子体控制是一项重要的基础性工作。是托卡马克装置等离子体能够平衡而正常放电运行的重要的基本条件。由于常规的PID控制器原理简单。整定方便,鲁棒性较强和不要对象精确的数学模型而被国际上多数托卡马克所采用,并且得到了一些很好的控制效果,但是它不能很好适应放电过程中等离子体参数变化如辅助加热、补充送气和弹丸注入等情况。在控制过程中,自适应控制系统不断地测量被控系统的状态和参数,实时对控制指标与期望指标比较,根据自适应控制规律及时作出决策,自动补偿模型阶次、参数和输入信号非预知的变化,改变控制器的结构和参数。以便保证系统运行在某种意义下的最优或次最优状态。 相似文献
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One-Dimensional Fluid Model for Dust Particles in Dual-Frequency Capacitively Coupled Silane Discharges 下载免费PDF全文
A self-consistent fluid model, which incorporates density and flux balances of electrons, ions, neutrals and nanoparticles, electron energy balance, and Poisson's equation, is employed to investigate the capacitively coupled silane discharge modulated by dual-frequency electric sources. In this discharge process, nanoparticles are formed by a successive chemical reactions of anion with silane. The density distributions of the precursors in the dust particle formation are put forward, and the charging, transport and growth of nanoparticles are simulated. In this work, we focus our main attention on the influences of the high-frequency and low-frequency voltage on nanoparticle densities, nanoparticle charge distributions in both the bulk plasma and sheath region. 相似文献
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石墨负极充放电过程的DFT研究 总被引:1,自引:0,他引:1
用量子化学DFT-B3LYP/6-31G(d)方法计算了锂沿石墨层堆积的Zig-zag和Arm-chair方向嵌脱及在石墨表面附着和脱附的过程.结果表明,锂嵌入过程是体系能量升高的储能过程,势垒最高点是锂在碳原子正投影位置,即在C-C键投影位置,而在苯环中心投影位置最低,为嵌锂的最佳位置,锂嵌脱的最佳途径应为arm-chair方向;锂在石墨表面附着也是储能过程,苯环中心上方是石墨表面近距离附着机率最高的位置. 相似文献