内圆外方同轴线外壁上的静电力

对内圆外方同轴线,用保角映射求得的电容得其荷电时的静电能,进而运用虚动原理计算单位纵长外壁每边承受的静电力,分析该力的性质,并与荷电内外均方的方形同轴线外壁单位纵长每边的静电力对比,反映异形传输线几何特征的影响。     

方形同轴线的静电力

计算了荷电方形同轴线内外板所受的静电力。用连续保角映射规范场区，借助椭圆积分求出专长我的电位分布和同轴线单位纵长的电容；在得到静电场能的表达式后以虚功原理获得同轴线内外板每边受到的静电力，并图示几何参数对电容和静电力的影响。     

荷电液滴联合声波捕集颗粒物的过程和特性

搭建显微可视化平台,观测以半山电厂灰为代表的颗粒物在电场及声场作用下相对于悬垂荷电单液滴的运动和捕集特性,利用激光粒度仪对颗粒物的凝并效果进行验证. 实验结果显示：对液滴进行荷电,可以将以惯性捕集为主要作用的灰颗粒绕流运动变为以静电力（介电泳力、库仑力）为主导的吸引作用,颗粒物在液滴表面的沉积状态由树枝状变为紧密堆积状态,而增加声场后,在颗粒初始轨迹之上叠加了往复的振动. 荷电液滴引入的静电力和液桥力强化了团聚体内部的黏附作用. 进一步的粒径分布表征实验发现,荷电液滴和声波的加入均可以有效促进颗粒的团聚长大.     

基于矩量法对连接器内电磁干扰的分析

构造了连接器内接插件间的一个紧邻干扰模型。基于矩量法对模型内单位长度参数进行计算,用传输线法研究了接插件之间的电磁干扰。分析了简化模型对高频干扰的可适用性,给出了干扰的频域结果和时域波形。模拟结果对正确设计、使用电连接器,降低内部电磁干扰有参考价值。     

油包水乳状液在圆柱电极聚结器中的分离特性研究

设计制作了一种带有绝缘层的圆柱电极静电聚结器,油包水乳状液流过电极,在电场力的作用下水滴聚结,经重力沉降达到油水分离的目的.通过室内实验,分析了油包水乳状液在这种电极作用下的油水分离特性,研究了圆柱电极的直径、长度和电场强度、含水率等因素对分离效率的影响.研究表明,在不发生电分散情况下,电场强度越大,油水乳状液在聚结器中的分离效率也越高;分离效率受电极作用时间和液滴间静电力的共同影响,在含水较低时,油包水乳状液中液滴间静电力小,电极作用时间的影响起主导作用.电极停留时间越长,分离效率越高;含水率升高,油包水乳状液中液滴间静电力增大,电极作用时间的影响作用减小,液滴间的静电力影响作用增大,液滴间静电力越大,分离效率越高.利用高速微观摄像系统拍摄并观察到聚结器出口液滴粒径比进口粒径明显增大,即圆柱电极静电聚结器对柴油一水乳状液具有良好的聚结效果.     

二维直流电晕电场特性测量技术——改进型探针法

<正> 一、引言随着我国电力工业的发展,火力发电厂越来越多地采用电除尘器作为消烟除尘的重要设备.电晕电场在除尘过程中起着关键作用,因为它既影响着所要捕集的尘艺的荷电,也影响着作用在已荷电的尘粒上力的大小.电除尘器的电晕电场是由在两极间施加了高电压和两极间的空域中存在着由离子和荷电粒子构成的空间电荷所形成的. 电除尘器的Deutch除尘效率公式为:     

荷电水雾除尘的性能研究

选择适于水雾荷电的单相雾化喷咀，采用感应荷电法对雾滴荷电规律和水雾除尘效果做了系统测试，并分析了该方式下系统的几何、运行、电气等参数对雾滴荷电程度的影响。     

高氯酸铵(AP)超细粉静电分散表征方法研究

通过实验和理论分析,确定了空气环境中AP超细粉料形成软团聚的过程中,液桥力最大,其次为范德瓦尔斯力与静电力.并根据作用力的大小,设计了静电分散分级实验,通过电晕风使微颗粒均匀荷电,借助库仑斥力来实现软团聚的分散分级. 实验获得的最佳分散分级电压参数为6 kV,可以将AP粉料中所含细粉的90%以上分离收集,并通过测量细、中、粗粉料质量的比例参数,在线表征AP超细粉料的状态.     

静电湿式旋风除尘器除尘效率的实验研究

简要介绍了液滴荷电，粉尘荷电对湿式旋风除尘器除尘效率的影响，分别考虑了单纯液滴荷电，单纯粉尘荷电及它们同时荷电时静电湿式旋风除尘的除尘效率。     

Einstein—Maxwell方程的共形平直内解

该文严格解出了一种既荷电，又荷磁，且电荷密度与磁荷密度比为常数的静止球对称天体的共形平直内解。     

Mechanical characteristics of SiO_2 electrets

1μm SiO_2 layer was thermally grown on silicon wafer. Negative and positive charging of SiO2 layer was performed by means of corona method at room temperature. By controlling grid voltage, we have obtained uniformly charged SiO2 with surface potential from -500 to +200 V. With certain electric field, the electrostatic force between charged SiO2 is investigated. Experimental results indicate that attraction not only exists between charged SiO2 with different polarity, but also exists between charged SiO2 with the same polarity, and no repulsion has been observed. The attractive force is related to both surface potential difference of charged SiO2 and the uniformity of the electric field. Based on the experiment, the attractive force is supposed to be caused by polarization when two charged SiO2 wafers are close.     

Mechanical characteristics of SiO<Subscript>2</Subscript> electrets

1μm SiO₂ layer was thermally grown on silicon wafer. Negative and positive charging of SiO₂ layer was performed by means of corona method at room temperature. By controlling grid voltage, we have obtained uniformly charged SiO₂ with surface potential from −500 to +200 V. With certain electric field, the electrostatic force between charged SiO₂ is investigated. Experimental results indicate that attraction not only exists between charged SiO₂ with different polarity, but also exists between charged SiO₂ with the same polarity, and no repulsion has been observed. The attractive force is related to both surface potential difference of charged SiO₂ and the uniformity of the electric field. Based on the experiment, the attractive force is supposed to be caused by polarization when two charged SiO₂ wafers are close.     

Interface Characteristics Between Colloidal Gold and Kaolinite Surface by XPS

The distribution of gold colloids in kaolinite and the interaction between gold and kaolinite surface were investigated by transmission electron mieroscotgy （TEM） and X-ray photoelectron spectroscopy （ XPS ）. There is strong interaction between the gold particles and the edge surfaces of kaolinite, in low pH solution, the edge surface of kaolinite is positively charged and electrostutic attrcactive force between colloide gold panicles and the positive edge surface of kaolinite woald facilitate the adsorption of colloidal gold particles onto the suface. TEM observation shows that the aggregate morphology of gold particles was dominated by particle-particle interaction and gold particles were adsorbed on the edge surface of kaolinite crystals , resulting from the electrostatic attractive force between colloidal gold particles and the positice surfaces of kaolinite. XPS data show that in Au4 f electron spectra there are four energy peaks related to gold, 83.8 eV, 85.7 eV, 87.5 eV, and 89.4 eV, respectively, which suggests that in chemical states there are metallic gold and Au bonded to O, similar to the form of Au2O3 , and composite Au2O3 is formed between the edge surface of kaolinite and colloidal gold surface.     

矿粒在振动式摩擦电选机中运动轨迹的研究与分析

振动式摩擦电选是一种比较重要的物理选矿方法．高压静电分选腔是电选机的重要组成部分,对矿物及物料的分选起着决定性的作用．本文介绍了振动式摩擦电选机及其高压静电分选腔的工作原理,并对进入振动式摩擦电选机高压静电分选腔中的荷电矿粒的受力情况、运动轨迹以及影响荷电矿粒在其分选腔中运动轨迹的因素进行了分析和研究．     

绘制静电场电力线的有限元方法

对于二维静电场问题,应用传统有限元方法可以计算节点电位和单元电位移分布。基于电位函数和电通量函数的共轭调和性质,本文提出一种由单元电位移分布数值求解节点电通量分布的有限元方法,进而绘制出等电通量线——电力线。这个方法不仅适用于平行平面场,也适用于轴对称场。实例计算表明:这个方法是二维静电场有限元分析软件包中一个有效的后处理方法。     

Scaling Analysis and its Applications of Electrostatic Micromotors

An electrostatic micromotor is compared with a conventional electromagnetic micromotor, and the scaling effect of driving forces is analysed according to their different operation principles. Characteristic dimension L represents the linear scale of micromotors. Electromagnetic driving force is proportional to high-order power of characteristic dimension L whereas electrostatic driving force is not. So, in micro domain, the effect of electrostatic force is larger than that of electromagnetic force, which makes electrostatic micromotor more competitive against electromagnetic alternative in MEMS. In assessing the performance of a micromotor, the power per unit volume and efficiency are the two most important criteria. Hence, the two kinds of micromotors are further compared from these two aspects. The results indicate that electrostatic a micromotor has higher power per unit volume and efficiency, moreover, its structure is simple, it can be made sufficiently small. For those advantages of electrostatic micromotors, they can be used in optical devices, aerospace equipment and medical instruments.     

特高压紧凑型输电线路工频电场强度计算

将有限元方法应用于特高压紧凑型输电线路电场强度的计算.建立二维静电场有限元模型,计算对比了特高压紧凑型线路导线表面电场强度和相导线平均电场强度最大值,分析了特高压线路导线截面和分裂半径的选取,也计算了线路下方距离地面1 m处最大电场强度和线路走廊宽度.计算结果表明特高压交流输电线路采用紧凑型方式具有一定的优越性.     

超滤过程中蛋白质带电性对水合作用的影响机制

为解析超滤过程蛋白质带电性能对水合作用力的影响机制,在牛血清蛋白(BSA)带正电、中性及负电条件下,分别考察PVDF-BSA及BSA-BSA之间的相互作用力随离子强度的变化特征,结合相应条件下BSA的Zeta电位变化特征,探讨超滤过程蛋白质带电性能对水合作用力的影响机制.结果证实BSA带电性能是影响水合作用力的关键因素.在BSA带正电条件下,作用力随离子强度的增大而增大,主要是因为BSA带正电时无水合作用存在,静电作用力的变化是控制膜污染的主要因素.在BSA电中性及负电条件下,BSA及PVDF膜面吸附累积大量的水合阳离子,随离子强度的增大,有效触发PVDF-BSA及BSA-BSA之间的水合排斥力,进而大幅度减缓膜污染;且在BSA等电点更容易观察到水合作用现象.     

静电热管除尘换热空间的温度分布特性

将带有肋片的热管置入静电除尘器中,构成静电热管式除尘器,使静电力和温度场的作用有机结合,以提高除尘和换热效率。本文进行了在静电场作用下,单根热管和管束的温度场分布规律的实验研究,得到了静电热管除尘换热空间的温度分布特性,为实际工程应用提供了理论依据。