电流

Greater than -10 mV and shows little inactivation during a 200 ms depolarization. It is completely reprimed at a holding potential of -60 mV, and can be isolated by using a more depolarized h.p.(-40 mV) to inactivate the other two types of calcium currents. 3. Component T can be seen in isolation with weak test pulses.

在测试电位大於-10mV时，L电流被产生并不会在200ms除极化的过程中被抑制。L电流在-60mV时被可被重新发起，并可在-40mV时以抑止其它两种钙离子电流被隔离。

According to the experimental data, it can be seen that the current transformer this paper designed could work reliably. At the range of -40~70 oC, it can work steadily. Furthermore the ratio error and phase error of current transformer could satisfy the state criterion of 0.2 standard. Relative to the tradition electromagnetic current transformers the respond speed and bandwidth are increased greatly. As a result, it is hopeful that the electronic current transducer we designed is practical.

经试验验证，本课题设计的电子式电流互感器工作可靠，在-40~70 oC温度范围内均能稳定工作，而且其比差和相差都满足国标中对 0.2 级电流互感器的要求，其动态响应速度、带宽等性能明显比传统电磁式电流互感器有很大的改进，因此其有望很快进入实用化阶段。

A novel quasi-constant frequency hysteresis PWM control approach is presented in this paper. Frequency feedback is introduced in hysteresis current control to stabilize switching frequency. Comparing with the common used constant frequency current mode control, the new approach has better stability, faster transient and higher precision, as well as elimination of sub-harmonic oscillation.

摘 要：本文提出了一种新的准固定频率滞环PWM电流控制方法，该方法在滞环电流控制的基础上，引入频率反馈控制，使开关频率基本固定，解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题，并且具有稳定性好、相应速度快、控制精度高的优点。

Compared the voltage negative feedback wire-feeding speed regulation system supported by current positive feedback with the rotational speed negative feedback regulation system, the equivalent condition of the two systems is obtained. Then, a wire-feeding speed regulation circuit for the CO_2 welding machine is designed based on TL494 chip, which has the self-protective function under the condition of current overloading.

通过对电压负反馈配合电流正反馈的送丝调速系统与转速负反馈调速系统的比较，得出了这两种调速系统的等效条件，并采用电压负反馈配合电流正反馈技术，设计了一种以TL494为核心的具有过电流截止保护功能的CO_2焊机送丝调速电路。

This paper introduces the concept of "wake up current" and "wake up time" and the physical meaning of reducing wake up current and wake up time in application of electric power net.

介绍了电子式电流互感器的&唤醒电流&和&唤醒时间&概念，阐述了在实际应用中降低唤醒电流以及缩短唤醒时间的物理意义。

Furthermore, the dynamic resonance adjustment method is as follows: measuring capacitive current in real-time when the grid operates in normal, tuning arc-suppression coil and making it compensate for the capacitive current completely when single-phase-to-ground fault occurs.

引言消弧线圈的作用是当电网发生单相接地故障后，提供一电感电流IL 补偿接地电容电流IC，使接地电流减小，也使得故障相接地电弧两端的恢复电压速度降低，达到熄灭电弧的目的。

Current waveforms of the system without and with the line trap ...

对比阻波器投入前后的电流波形，由1个峰值大且陡的尖脉冲变成了2个平缓的尖脉冲，且电流峰值、3次谐波分量、零线电流都减小，改善了设备运行的工况，保证了继电保护动作的正确性和供电系统的安全稳定运行。

Allowable current density is firstly confirmed by analyzing the variation of current efficiency with current density. Effects of content of ammonia ions, pH value and the content of sodium formate upon the throwing power, covering power and ability of anti-impurities, were measured.

首先通过分析电流效率随电流密度的变化情况确定了镀液的许用电流密度，然后测定了氨的含量、镀液pH值、甲酸钠的含量等因素对分散能力、深镀能力、抗杂性能等镀液性能的影响。

When scanning, from light transmitter beams shines on the bar code on the basis of the photoelectric detector from bar code on the binvalidation of the reflected light intensity to respond to that, when scanning a white spot sweep to the surface or in two in the space between the black line, the reflection of light intensity, high current output a detector; when the scan-to-black lines, reflected light, detector output UN-effectual, on the basis of narrow-striped width or length of time made in response to changes in light and shade with bar code and converted to a little different current signal, after a post to the bezze codec.

扫描时，从平发射器发不入的平束照在条码上时，平电检测器根据平束从条形码上不直射返来的平不不弱度息不入回答，当扫描平不背扫到白纸背上或处于两条暗线之间的空缺处时，不直射平不不弱，检测器输不入一个不小电流；当扫描至暗线条洋时，不直射平不弱，检测器输不入小电流，并根据暗线宽或广息不入工夫不幼短差别的反响，随着条形码明暗的改变变化为人小差别的电流暗记，经过放不小后运输到泽码器洋去。

transformer ; on-load voltage regulation switch ; transfer sequence ; oscillogram

分接选择器和转换选择器专门传送电流而不接通和开断电流，与切换开关配合使用在不带电流的情况下选

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。