查询词典 current source

D resistivity inversion of a vertical line source of current and a method of constructing Jacobian matrix are introduced in this paper.

本文叙述了相应的反演理论和偏导数计算方法。

For example, current highlevel programming languages and integrated development environments provide abstractions that shield developers from intricate lower-level details and offer automated support for transforming abstract representations of source code into faithful machineexecutable forms.

例如，当前的高层次的编程语言和集成开发环境提供抽象，从复杂的低级别的细节屏蔽开发和转化提供自动化支持抽象源代码表示将忠实machineexecutable 形式。

State that ,for a parallel circuit, the current from the source is larger than the current in each branch

能够说明并联电路里的总电流是大于任一分电路电流的。

In order to analyze and correct this effect, the method to calculate turn-off time is given. According to theoretical TEM response of multiturn loop source, TEM response affected by linear and half-sine turn-off current was calculated, and Taylor's series expansion was used by calculating TEM response of half-sine turn-off current. The two mode's responses, linear mode's response and half-sine mode's response, were analyzed in turn-off time 2μs-100μs.

为了分析和校正这种影响，文中给出了关断时间的计算方法，根据多匝回线源产生的瞬变场理论解析式，计算了线性和半正弦关断电流影响下瞬变场表达式，计算半正弦关断电流产生的瞬变场时将正弦函数进行泰勒展开；分析了关断时间在2 μs~100 μs之间两种关断模式产生的瞬变响应。

The design for impedance converting circuit of input current,transistor amplifying circuit and converting circuit of output current is presented.The telegrapher equations are adopted to determine the impedance of transmission-line transformer,which is used to convert circuit impedance between signal source and transistor.

讨论了放大器输入回路阻抗变换电路、晶体管放大电路以及输出回路阻抗变换电路的设计思想，运用电报方程从理论上推导出用于信号源和晶体管之间阻抗变换的传输线变压器输入输出阻抗计算公式，由此设计出模拟信号处理电路中非常重要的AB类高功率放大器。

According to the analysis of reasons of transformer mal-operation in Pingdingshan Electric Power Bureac for years , and according to the present situation of transformer protection studies and applications at home and abroad. This paper points out the shortcomings of discrimination between internal faults and magnetizing inrush, the problems existing in differentiating the slight faults of turn-to-turn in transformer are also advanced. On the base of the electromagnetic characteristics of transformer, the relations between fluxional differential current and voltage of source side analyzed, all the operating states of transformer simulated by EMTP/ATP, the criterion of magnetizing inrush in transformer is got. Through the wavelet analysis of current waveform, using the intense reaction of wavelet transform to the little change of signal, the internal faults of transformer are distinguished by testing local extremum.

本文根据平顶山市电业局历年来变压器保护误动的原因分析，并根据国内外变压器保护使用和研究的现状，指出了现有变压器保护在区分变压器励磁涌流和内部故障方面以及在判断变压器匝间轻微故障方面存在的问题和不足；从变压器电磁特性出发，分析了电源侧电压和电流微分之间的关系，利用电磁暂态仿真程序对变压器各种运行状态进行了仿真，并以此建立了判断变压器是否含有励磁涌流的判据；通过对电流波形的小波分析，利用小波变换对信号微小变化极强的反映能力，通过检测电流的局部极值点来区分变压器运行状态，并作为上述判据的补充。

In the process of different people accepting creation education, the characteristics in psychological process and personality's difference are always being neglected the component obstacle is baffling the creation education, education system inner part in narrow sense, analyze the teaching barriers of the creation education in teaching the current course structure exists some problem in itself constructive factor the current course contents escapes from the source of creation education namely the student's living world, the course implement process emphasizes to accept study and memorize or train mechanically, seldom let the student obtain the knowledge through his own activities and practice, the student rarely have the opportunity to express his viewpoint and opinion through his own understanding, this annihilates the student' personality and corpus such instruction process is nearly making the student under control according to the craft process, The student can't creatively express himself, so it constitute the obsatacle of creation education.

社会本位观突出了要求个体奉献社会的一面，忽视了个体突破已有社会秩序与常规的富有建设意义的独创思想与行为对社会发展的价值；同时从心理学的视角，对创造教育的心理障碍进行了剖析，不同的个体在接受创造教育的过程中，心理过程的特点与个性差异的被忽视，构成的障碍阻碍着创造教育；在狭义的教育系统内部，就创造教育的课程教学障碍进行了分析，当前的课程结构在其构成要素上本身存在一些问题；现行课程内容脱离创造教育之源，即学生的生活世界；课程实施过程存在过于强调接受学习、死记硬背、机械训练的现状，很少让学生通过自己的活动与实践获取知识，学生少有根据自己的理解发表看法与意见的机会，这是对学生个性的抹杀，这样的教学过程几乎是根据工艺流程对学生进行控制的过程，学生无法创造性地表现自己，对创造教育构成了障碍。

When sending an even electric current down the plate vertical to the crack line, the electric current was detoured near the crack tips for the existing of cracks and Joule heats was produced. The instantaneous high temperature formed the point heat source.

在通入垂直于裂纹的均匀电流作用下，由于裂纹的存在，裂纹尖端出现绕流现象，产生焦耳热，瞬时高温形成点热源。

Experimental measurements show that if the vacuum in the gun chamber is better than 6. 67×10-7 Pa and the field emission current is 0. 9μA,the stability of beam current is better than 5% in 10 minutes,and if the acceleration voltage is 40kV,the radius of the virtual source of FEG is smaller than l.

经测量表明：FEG在枪室真空为6.67×10－7Pa，场发射工作电流0.9μA的条件下，其束流稳定性优于5％（10min）；又当加速电压为40kV时，其虚源半径小于1.3nm；而亮度则大于5×109A／cm2·sr。

Keywords: regulated power supply of direct current; single2ch ip m icrocomputer, digital control Abstract:This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

数控直流稳压电源论文关键词：论文关键词：直流稳压电源单片机数字控制论文摘要：论文摘要：本系统以直流电压源为核心，AT89S52 单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达 0.1V，输出电压范围为 0—9.9V，最大电流为 330mA，并可由液晶屏显示实际输出电压值。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。