查询词典 electric current

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

Be based on Matlab to emulate computational software, to jacket medium faradic build a model respectively with capacitance electric current, the response that discussed cable jacket to be isolated from to issue jacket electric current in all sorts of breakdown is characteristic.

基于Matlab仿真计算软件，对护套中的感应电流和电容电流分别建立模型，讨论了电缆护套绝缘在各种故障下护套电流的响应特性。

The unit of rate of flow of electric current is the ampere, which shows the amount of electric current.

电流流动的速率的单位是安培，它表示电流的大小。

The unit of rateof flowof electric current is the ampere, which shows the amount of electric current.

电流流动的速率的单位是安培，它表示电流的大小。

The college physics teaching materials have only studied a little magnetic induc tion on the axis of the roun d electric current,have not provided the formula of calculating to the magnetic induction that the round on e is inside a bit more wanton, after Biot-Savart law of trees formula can draw w anton magnetic induction expression formula of intensity a bit inside the round electric current.

大学物理教材中只研究了圆形电流轴线上一点的磁感应强度 B ，而对圆面内任意一点的磁感应强度 B却未给出计算公式。本文运用毕奥—萨伐尔定律及西普森公式，计算出了圆形电流面内任意一点磁感应强度的表达

The effects of the dehydration parameter such as temperature, electric field, demulsifier, the concentration of the iron sulfide, polymer, and water in crude oil on the dehydration current was investigated in this experiment. The reasons that the Electric field of the dehydrator is collapsed were analyzed. And some methods could decrease the dehydration current were put forward.

利用该套小型静态模拟电脱水器试验装置考察了在直流电场下，脱水温度、脱水场强、破乳剂、Fe含量、聚合物含量、碱含量表活剂含量和原油含水量等因素对脱水电流的影响，分析了电脱水器垮电场的原因，并提出了降低原油乳状液脱水电流的方法。

The four conditions are as follows: the molten alloy only with the addition of deoxidant during melting; only applying high-density pulse electric current on castings during solidification; compound addition of grain refiner and sodium modifier, and addition of borax r modifier liquid along with applying pulse electric current during melting.

这4种工艺条件分别为：在合金液熔炼过程中，除了加脱氧剂外不做任何处理；凝固过程中单独施加高密度电脉冲；添加晶粒细化剂和钠盐变质剂混合剂，或者添加硼砂变质细化剂，并施加高密度电脉冲。

Unstable electric current and voltage are the most two environmental killers for IC board,"High stable IC board" means having the ability to resist compression toward disorderliness electric current and voltage.

一片优质的IC板不仅具备多项功能，更重要的是具有『高稳定性』；IC 板的外在环境头号杀手是不稳定的电流、电压，『高稳定性』乃是指对紊乱的电流、电压有抗干扰性。

Maxwell's equations group in fact was already found in the basic experimental laws of electromagnetic phenomena, as well as a single magnetic pole does not exist on the facts and the integrated displacement current assumptions, using an international system of units, these equations can be written as: DivDW =ρ or DW =ρ(1) kiDivBq = 0 or Bq = 0 (2) kiCurlEBq =- Zt or × EqkZ =- BqZt (3) ZCurlHDWDW = jE Zt, or × HW = jE Zkt (4) Z-type in the Curl, and Div were vector operator curl and divergence, Micro-k points for the Hamiltonian operator, in the rectangular coordinate system,= iZZEkx jEy kqz, iE, jE, kq along Zx, y, z-axis unit vector, a vector for any AW are × AW = CurlAW, kAW = DivAW; DW for the electric displacement, Bq for the magnetic induction intensity, Eq, and HW, respectively i field and electric field strength, jY for the conduction current density,ρ the charge density for free.

麦克斯韦方程组实际上是当时已发现的电磁现象的基本实验定律以及单个磁极不存在的事实和位移电流假设的综合，采用国际单位制，这些方程式可写成：DivDW＝ρ或DW＝ρ（1）kiDivBq＝0或Bq＝0（2）kiCurlEBq＝－Zt或×EqkZ＝－BqZt（3）ZCurlHDWDW＝jE＋Zt或×HW＝jE＋Zkt（4）Z式中Curl和Div分别为矢量算符旋度和散度，为哈密顿微k分算符，在直角坐标系中，＝iZZEkx＋jEy＋kqz，iE，jE，kq是沿Zx、y、z轴的单位矢量，对任一矢量AW有×AW＝CurlAW，kAW＝DivAW；DW为电位移，Bq为磁感应强度，Eq和HW分别为电i场和磁场强度，jY为传导电流密度，ρ为自由电荷密度。

For the current in the ionization chamber is not amplified, so it is hard to collect the electric signal, in this paper, a direct I/F convertor is used to convert the electric current signal into frequent signal.

由于电离室本身不对电流放大，因此信号的采集较为困难，本文另外介绍了用I/F直接变换的电路以达到信号的转换。

Mr. Putin said there were signs of genocide against the Ossetian people.

普京说，有迹象表明对南奥塞梯人进行了种族清洗。

What I'm trying to say, Tristan is...

特瑞斯坦。我想说的是。