是德科技推出用于新型材料研发的高性能毫微微安计/皮安计和静电计

随着对纳米材料、石墨烯、聚合物和介电材料等新型材料的研发的逐渐深入,这些材料的应用愈加广泛。新型材料市场的不断扩展带来了对电子测试设备的更高要求。对于电子工程师来说,如何确保材料测量兼具卓越灵敏度和高置信度,是一项极大的挑战。

新型通用高压直流安培计

【正】 1.前言我们研制了一种多用直流安培计,该安培计通常建立在试验室环境下,它容易制作,具有多种变换应用功能。普通安培计其共模电压限度大约都在1000V,这样就限制了它的用途。克服这种限度的通常方法是把安培计设置在线路的低压端。

电场的描绘

<正>特殊仪器: 简易开关、一束连接线、零点指示器(微安计或耳机)、绘图纸(由学生自备)。 一般仪器: 场绘制图板和两个探针、导电纸与电极图、电源(1—3~v干电池或音频振荡器)。 实验目的: 通过等位线并画出电力线草图来考查电场的性质。 引言:电场是一个区域,在那里面出现的电荷都受到电力的作用。如果在电场中某一点电荷q受电场力F作用,每单位电荷所受的力就定义为该点的电场强度E。

高中化学电离度一节补充实验二则

本节教材因缺乏直观的实验演示,学生学起来觉得抽象,教师教时感到乏味。我在教学中补充了二则实验,通过实验来说明温度、浓度对电离度的影响,收到了较好的效果。

Evaluation of vehicle damage involved in road crashes based on quantificated model

Based on economics theory,social value loss caused by vehicle involved in crashes as well as various factors influencing on it were analyzed,the corresponding mi- cro-econometrics model was theoretically given.Moreover,the practicability of the model, the veracity and rationality of quantification were analyzed.Based on probability theory and mathematical statistical theory,macro approach to evaluating vehicle damage in crashes was presented,and the corresponding macro-econometrics model was con- structed.In addition,the macro-econometrics model was utilized to assess economic loss from statistical data of vehicle damaged in crashes,which has shown that the model can meet the demand of quantification analysis of vehicle damage,and be applied to the evaluation of economic loss caused by crashes.The results in this paper will be of practic- al significance for scientific,comprehensive and rational evaluating socio-economic loss caused by road crashes.

水果电池再探究

一、问题提出近年来,有关水果电池的研究比较热门[1],水果中含有大量糖类、蛋白质、生物酸等物质,其中的生物酸起电解质的作用。往水果中插入不同金属电极并用导线连接起来,会有电子的转移,产生电流,形成水果电池。根据原电池的原理及形成条件,假设水果电池所产生的电流大小与水果中所含的电解质溶液。