关于静电计“三问”

静电计既可以检验静电荷,又能测量静电的电势差即电压.为什么静电计能测静电电压?为什么静电计和电压表不能互换?又是为什么我们用静电计演示光电效应现象几乎看不到指针明显地偏转?师生心里常常有这样三个疑问.现对此作一探析.     

静电耗散标签在电子产业中的应用分析

一、静电对电子产业的负面影响 由于物体间的接触分离（摩擦、剥离、撕裂和碰撞等）或电场感应，会产生物体之间或物体内部带电粒子的扩散、转移或迁移，从而形成物体表面电荷堆积，即呈现带电现象。这种现象可能导致物体表面电荷对空气中带异性电荷的微粒子尘埃的吸引，造成电子敏感元器件绝缘性能的降低、结构腐蚀或破坏。[第一段]     

机房防静电地板的选择与维护

近年来,随着各地数字电视及双向业务的开展,有线电视机房设备的数量不断增加,机房内的各种设备日趋精密,机房接地防静电成为安全播出的重要条件,因此,分析机房静电产生的原因及危害,并采取措施尽可能减少此类故障成为机房建设中应重点考虑的问题。     

Experimental investigations of granular shape effects on the generation of electrostatic charge

In solid processing systems, electrostatic problems are commonly observed for granules of various shapes. However, a complete understanding of the basic dependence of electrostatic charge generation on particle shape has yet to be established. This observation motivated the present study on examining the effect of granular shape on electrostatics. In this study, polyvinyl chloride （PVC） granules （diameter 1.1-4.1 ram, in the shape of a triangle or trapezium） were first discharged to remove any residual charges and sub- sequently their electrostatic charging characteristics were studied by allowing a granule to slide along a pipe wall. Several factors such as granular front-facing angle, length-ratio, sliding area, sliding orienta- tion, sliding times, and relative humidity were considered when studying their effects on the electrostatic charging of granules. It was found that triangular granules with smaller front-facing angles tended to generate more electrostatic charge. The amount of electrostatic charge increased with granular length- ratio and sliding area but decreased with humidity. In addition, granular sliding in the orientation of the front-facing angle （for triangular granules） or the short side （for trapezoidal granules） generated more electrostatic charge than that in the orientation of the long side. For both granule shapes, the elec- trostatic charge increased with granular sliding times and reached a saturated state after around 8-9 sliding movements. The saturated electrostatic charge increased with either granular length ratio or sliding area.     

静电以及静电放电的控制

静电以及静电放电的控制Ｓｔａｔｉｃ　Ｔｅｃｈｎｏｌｏｇｉｅｓ公司Ｊｉｍ　Ｎｏｖａｋ１．静电静电以多种方式显示它的存在。我们在静电方面经常遇到的一个不愉快的体验是当我们的手接近门把手时遭到静电的电击。静电还可以通过吸附在衣服上或把灰尘吸附在电视机和ＣＲ...     

关于电池的二点疑难探讨

在新课程电动势教学中,教师们经常这样描述电流的形成:电源的正极有大量正电荷,负极有大量的负电荷;闭合外电路后,电源两极上的电荷对外电路建立一个电场,使导体中的电荷做定向移动;在内电路,电荷在非静电力作用下做定向运动.这样的描述有没有科学性错误?电池的两极究竟有没有带静电荷?可把此问题称之为电势之谜和电荷之谜.这两     

电子产品中的静电防护

引言随着科学技术的发展,电子类设备生产企业中大量采用大规模集成电路.电子产品集成化迅速提高,超大规模集成电路大量生产和广泛应用,集成电路的内绝缘层越来越薄,其互连线与间距越来越小,相互击穿电压越来越低,器件尺寸的变小和芯片内部的氧化膜变薄,使元器件承受静电放电的能力下降而成为静电敏感器件.静电放电(ESD)对电子器件有...     

静电危害及其防护

 静电是一种常见的自然现象;一方面静电现象可造福于人类,例如我们熟知的静电复印、静电除尘、静电分离、静电防腐、静电造纸、静电养殖……这些有关静电技术的应用,遍及人类生产、生活、科研的各个行业和领域;另一方面静电现象也会在极为广泛的范围内给人类带来各种各样的危害;因此,认识静电和防止静电危害对于我们是非常重要的。静电基本知识我们通常把相对观察者静止的电荷叫做静电。静电现象广泛地存在于自然界和我们日常生活之中,比如我们每时每刻呼吸的空气,每立方厘米就含有100～500个带电粒子,我们居住的地球就是一个巨大的带电体,地壳上带有5×10⁵C的电荷.     

Analysing Imaging Signals of Negative－Charging Contrast in Scanning Electron Microscopy ＊

Negative charging of a specimen may produce the image contrast of yielding the information under the in-sulating thin film in scanning electron microscopy. To clarify and make good use of the recently developednegative-charging contrast (NCC), we propose a simplified procedure for quantifying secondary electron (SE)imaging signals and report the calculated results. The theoretical considerations and calculations are validatedby comparing the calculated relation between the SE signal and the surface potential with measured dynamiccharacteristics of the NCC images. The results show that in the region of weak negative charging the NCCformation is due to the SE redistribution. The intensity of SE signals decreases with increasing the amount ofthe SEs returning to the negatively charged surface whose local electric field may attract electrons. This resultsin the NCC transient characteristics.