工频

And it can be proved that under the condition of complete alternation sampling, this new method can realize the accurate extraction of the phase angle of fundamental wave.

分析表明，在信号整周期采样的条件下，该算法可以实现工频基波相位信息的精确提取。

Phase difference extended measurement method of the signal ...

同时给出了对工频信号以外信号的相位差扩展测量方法。

By adjusting the variable inductor, the primary voltage can be easily got through power resonance. Tests show that the method is objective and effective.

条件已标定的可调电感，通过工频谐振很容易获得误差试验所需的一次电压，能较好的解决GIS电压互感器误差试验面临的难题。

PVC insulated and Nylon jacketed wires and cables is suitable for power device with fixation installation and ratel voltage up to and including

聚氯乙烯绝缘尼龙护套电线使用于工频额定电压Uo/U 450/750V及以下动力装置固定敷设的电线电缆。

A dual T network forms a rejecter to suppress the disturbance of the industrial 50Hz frequency.

并且采用双T网络构成的陷波器，对50Hz的工频干扰进行抑制。

Objective To find a new method for repressing the 50 Hz power-line interference in ECG signals.

目的 探讨一种用于抑制心电信号中50 Hz工频干扰的新方法。

Based on method of moment and field-circuit coupling theory, nodal method of analysis in circuit theory is applied to the power parameters calculation of grounding grids. The inner self-resistance and self-inductance of conductors, mutual inductance between conductors, and displacement current of conductors are taken into account.

基于矩量法和场路结合的思想，将电路中的节点电压法用于接地网工频参数计算中，该方法不仅考虑了接地导体的内自阻抗和自感，而且考虑了导体间的互感，导体的位移电流。

Results With our designed filter, 50 Hz powerline interference in high sampling rate was efficiently removed, and the filter coefficients were simple, integral,and convenient.

结果 该方法设计的滤波器能有效去除高采样频率下50 Hz工频干扰，且系数为整数，实现简单。

Based on the rigorous analysis of the kinetic process of both primary and secondary electrons, the related surface charges were analyzed, and the energy gain of emitted electrons was proportional to the square of the ratio between the tangential and normal component of electric field. In this process, the image force of mirror charges would result in an energy loss. Meanwhile, the effect of field alternation of power frequency ac voltage on electron movement could be ignored.

在前人工作的基础上，进一步严格推导了场致一次发射电子和二次电子的运动方程，分析了电子发射引起的绝缘材料表面带电，表明电子发射后的能量增益正比于场强的切向与法向分量比值 F /// F ^的二次方；同时考虑了在电子发射和运动过程中电荷镜像力的作用，并探讨了交流电压下表面带电的情形，认为当考虑电荷镜像力的作用时，电子的能量增益可能变小，而工频交流电压下电场交变对电子运动的影响可以忽略。

The results showed that 50Hz magnetic field at 0.4mT transitorily induced the activation of P38 MAPK at 10 to 15min, while 0.1mT 50Hz magnetic field did not induce the activation of P38 MAPK within 24h.

结果提示CHL细胞经0.4及0.8mT工频磁场辐照处理后，可呈时相性增强SAPK磷酸化，并且均在15min时达到最大值，SAPK磷酸化分别提高20％和17％；同时SAPK激酶活性也相应增强，分别是对照的2.9±0.4和2.1±0.9倍。

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。