用激波管测量固体介质中的空间电荷分布

本文分析了压力阶跃波法测量固体介质中空间电荷分布的基本原理,讨论了激波在气体激波管内的传播及气体激波作用于固体时在固体内引起的波动的过程。用直径为113mm的激波管为主体构成了空间电荷测量系统,并用压力传感器和微型计算机构成了激波波速测量装置,从而较准确地获得了激波波速、激波压力阶跃波形等有关参数。并得到了一些空间电荷的测量结果。     

静电纺纱电极系统三维电场的边界元法分析

本文应用边界元法分析静电纺纱三维电场。文中简要介绍了多层介质三维电场的边界元法离散化方程,并通过具有解析解实例的计算对该方法作了论证。然后用该方法计算静电纺纱电极系统三维电场,取得两个剖面上等位线的分布,并对纺纱电场作了分析。     

电子辐照电介质中累积电荷的分布

本文采用了一种数值计算方法,用来分析电子辐照电介质中电荷力学特性。根据实验测定的电子沉积曲线和剂量深度分布曲线,用有限差分法联立求解连续性方程和泊松方程,可以得到电介质内累积电荷分布和电场分布。在开路和短路二种状态下,电子辐照聚乙烯的电荷密度分布随辐照时间的变化显示了电介质荷电的过程。计算了不同电子能量时的电荷分布,并对电荷“记忆”效应作了模拟。     

Supercritical CO2-based solvents in next generation microelectronics processing

Large amount of chemicals and highly purified-water are needed in microelectronic manufacture. The ability of solutions to penetrate tiny spaces will become significantly more challenging as the feature size of semiconductor devices decreases to nanoscale dimensions and the functional complexity of integrated circuitries (ICs) ever increases. Supercritical fluids (SCFs) possess a unique combination of properties (no surface tension and gas-like viscosity) that can potentially be exploited for application in microelectronics manufacturing and processing in response to needs for material-compatible cleaning systems, small-dimension developing solvents, and low chemical-use processes. Recent microelec- tronics processes for cleaning and rinsing of patterned porous low-k dielectrics and drying of photo- resist in CO2-based solvents are the main focus of this review. Additional topics in supercritical fluid processing include spin coating of photoresists, development with nanoscale dimensions, metal deposition and silylation.     

多相电介质力电粥合的等效本构方程

以多相电介质材料为背景，探讨用多相体表现物理量定义其相应的多相体有效物理量的方法，得到建立多相体的等效本构方程的一个方法。当相界面处无位移和电势跳跃，不存在界面外加面力和自由面电荷，该方法中所定义的多相电介质材料的有效物理量和通常所采用的体积平均方法所定义的有效物理量是相同的。将该方法应用于横观各向同性多相介质层合板有效压电性质，给出了横观各向同性多相层合板在平面应力情况下力电耦合本构方程的组合表达式。     

中高压介质电容瓷料迭加试验研究

利用混合物的介电性能的原理, 设计了改善介电材料的温度系数的方法,进行了理论和实践的探讨,并对混合物的介电常数公式进行了修订.     

Preparation and characterization of Ni-P hollow material based on the shape of <Emphasis Type="Italic">Nocadia</Emphasis>

A new type Ni-P hollow material with rod-shape is prepared by electroless deposition method and heat treatment based on the shape of Nocadia, a kind of bacteria. The material is characterized and its magnetic, electromagnetic and mechanical properties are measured. It is found that the Ni-P coating transforms from a disordered structure before hollowing to an ordered arrangement of face centered cubic （FCC） Ni after hollowing at 673 K and body centered tetragonal Ni3P occurs. After hollowing no change of the surface morphology has been found. But the cytoplasm disappears and the Ni-P layer becomes more compact. A new type hollow material with shell thickness of 150-200 nm is obtained. The saturation magnetization （Ms）, remanent magnetization （Mr） and coercivity （Hc） are enhanced to 20 emu/g, 2.7 emu/g and 117.5Oe, respectively. The dielectric and magnetic loss are improved to 14 and 0.4, respectively. The hardness and the elastic modulus are raised to 1.80 GPa and 23.79 GPa, respectively. All show great improvement compared with those before hollowing.     

应用SWR技术研究垂柳茎体含水率

应用驻波率(SWR)技术对垂柳茎体含水率进行了较长期的监测,验证了SWR技术可以用来定量监测乔木茎体的含水率.实验结果如下:①对垂柳茎体含水率的日变化观测结果表明,在晴天茎体含水率呈下降趋势,下降范围为7%-4%,下午又基本恢复到起始状态;阴雨天茎体含水率的日变化范围较小,为4%-2%;②茎体含水率季节性变化观测结果表明,垂柳茎体含水率具有周期性变化的规律,变化范围为18%-10%;③受根部土壤水分和叶片蒸腾耗水的均衡作用,垂柳茎体含水率基本保持在一定的范围内变化;④不同深度的土壤水分变化情况不同,深度为35 cm的土壤传感器水分变化最剧烈,受降水、根系吸水和近地面空气层影响也最大,而离地表越深,土壤水分变化越小.     

离子空间电荷形成的动力学过程

本文分析聚酯介质中离子空间电荷形成的动力学过程,给出了描述这一过程的数学方程。在所设计的实验中,验证了理论分析,直接获得了离子空间电荷的实验证据。理论分析可以解释实验规律,并可以估计出聚酯中初始可迁移离子的浓度达9.6×10~(26)m~(-3)。     

有机介质中陷阱产生的等温电流研究

考虑现有测量方法难以区分电子陷阱和空穴陷阶的困难,该文提出表面电位模型,实现了对电子陷阱能级密度和空穴陷阱能级密度分布的测量,发展了J.G.Simmons的等温电流理论.在此基础上提出一种比较实验法,研究强电场作用下介质中产生新陷阱的动力学过程.结果表明在一定时间下,介质中新陷阱密度的产生与强电场的指数关系成正比,而在一定强电场下与作用时间成正比.