电流

Dynamic performances during sudden changes in load are analyzed and simulated. It emphasizes on the processes of three-phase sudden short circuit in machines terminal and self-excitation capacitor switching off. The effect of the instant at which the induction generator is short circuited on the maximum current is showed.

研究了异步发电机定子机端突加和突减对称负载时的暂态过程，着重分析了三相突然短路和自激电容突然断开时电流变化情况，说明了不同突然短路时刻对最大电流的影响。

Bi-directional power flow is realized when this rectifier is used at the commutating side of an in-verter.

1引言目前，对三相AC/DCPWM变流器的控制有直接电流控制和间接电流控制两种方法[1，2]。

Degaussing resistor is a thermistor (四四方方board, with three-pin components), their cold resistance is generally 12 ~ 47 ohm-ohm range, when the city electricity after, the resistance low power was the work of degaussing coil, degaussing coil current larger, making degaussed temperature resistance, resistance increased dramatically, resulting in flow through the degaussing coil current decreases sharply complete degaussing process.

消磁电阻其实是一个热敏电阻（电路板上四四方方的，有三个引脚的元件，），其冷态阻值一般为12欧姆~47欧姆不等，当市电经过时，其阻值较低，消磁线圈得电工作，消磁线圈的工作电流较大，使得消磁电阻的温度升高，阻值急剧增加，致使流过消磁线圈的电流急剧减小，完成消磁过程。

Four parts are included as follows:First of all, the phasor method is adopted to analyze the influence of the demagnetizing coefficient, saliency ratio and stator current control strategies of PMSM on the motors voltage and current phasor loci and then the power capability and the flux-weakening level.

概括起来，本文的内容可分为以下几个部分：第一部分首次采用永磁同步电动机d、q坐标系下的相量分析方法，详细分析电机不同弱磁率、凸极率及不同定子电流控制策略对电机电压、电流相量变化轨迹的影响，及由此导致的电机功率特性及弱磁扩速能力的差异。

CNTs/PTFE and CNTs/epoxy composite materials were used as field-emission cathode and the two electrode configurations were encapsuled into a static vacuum system respectively.

通过对比测试，研究了两种复合材料阴极在静态真空系统中的场发射特性，比较了两者在不同场发射电流密度时的电流稳定性，以及随着封装后时间的增长对静态真空系统场发射性能的影响。

After the research it is held that when internal fault takes place in the transmission line where the series compensation device is located, the corresponding protective measures, e.g., the forced triggering the by-pass gap, etc., is the effective approach to avoid the appearance of excessing level of transient recovery voltageand oversize coupling current.

文章结合我国南方电网河池固定串补及平果可控串补工程，对超高压输电线路装设串联电容补偿装置后的系统状况进行了比较深入的研究，指出一些系统问题，如过电压水平升高、潜供电流增大和可能发生的次同步谐振均源于串联电容补偿装置的固有特性，通过研究认为当串补所在输电线路发生内部故障时，采取强制触发旁路间隙等保护措施，是避免出现系统恢复电压水平超标和潜供电流增大等问题的有效途径。

It is advisable to decrease the humidifying level of anode gas when operating at high current density to avoid two-phase flow in cathode so as to improve mass transfer.

故PEMFC在小电流密度工作时，应该使阳极气体充分增湿；而在大电流密度工作时，应该适当降低阳极的增湿程度以降低阴极两相流的机会，从而改善阴极的传质状况。

To investigate the relationship between cytoskeleton and hypos motic membrane stretch-induced increase in muscarinic current,the role of actin microfilament in hyposmotic membrane stretc卜induced increase in muscarinic current was studied with the whole-cell patch clamp technique in guinea-pig gastric myocytes .

在急性分离的豚鼠胃窦平滑肌细胞上，利用膜片钳技术的传统全细胞模式记录离子电流的方法，探讨微丝在低渗牵张诱导毒覃碱电流增加中的作用。

Firstly, this thesis makes an introduces on the developement of PMSM servo system based on DSP. According to the control theory of AC PMSM servo system, this paper analyzes the coordinate transformation, the rotor magnetic field orientation and the current control strategy of AC servo system. The control strategy is i_d=0. The system is orientates towards rotor magnetic field. Then the mathmatic models of PMSM in d-q coordinate are set up.

本文首先对基于DSP的永磁同步电机伺服系统的发展概况进行了介绍；根据永磁同步交流伺服系统的基本控制理论，分析了交流伺服系统坐标变换原理、常用的磁场定向方式及电流控制策略，并给出i_d=0电流控制策略及永磁同步电机按转子磁场定向的控制方式，从而建立永磁同步电机d-q坐标系下的数学模型。

It was found that BK potentiated the peak value of ATP-activated currents predominately while the steady state value was not affected obviously.

BK对ATP激活电流的增强作用以增强其峰电流为主，对稳态部分增强不明显。

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。