查询词典 power frequency

The results show that when an electromagnetic field with 1000 Hz frequency and 20 kW power is imposed, the surface roughness of hollow billets is decreased by 50%, the solidification structure is refined, the tensile strength is improved by 40%, and the elongation is improved by 50%, averagely; when the power is heightened to 30 kW, the solidification structure is coarsened and the mechanical properties are worsened.

研究结果表明：当施加频率为1kHz的电磁场时，空心管坯的表面粗糙度降低了约50％；当施加功率为20kW的电磁场时，空心铜管坯的组织得到细化，抗拉强度提高了约40％，延伸率提高了50%；当施加30kW的电磁场时，铜管坯组织粗化，力学性能下降。

With development of modern power electronic technique, many reactive power-voltage controllers emerged which can improve voltage stability although debasing frequency dynamics at the same time.

随着现代电力电子技术的发展，电力系统出现了许多用于无功-电压控制的装置，这些装置在提高系统电压稳定性的同时，使系统的动态频率特性变坏。

This paper gives a facile simple method for measuring the frequency of power system, emends the mathematical model of Voltage fluctuation and flicker, confirms the means of every physics variation, expounds the algorithm of the power quality indexes and compile program to practice the algorithm on the practical device.

本文提出了一种简单实用的电力系统频率测量的方法；修正了电压波动的数学模型，进一步明确了各个物理量的意义；给出了各个电能质量指标的计算方法，并在实际装置上编写了应用程序予以实现。

Objective To evaluate the application of impulse mode in the early stage of phacoemulsification.Methods Set impulse frequency at6-10/second when emulsifies the nucleus in150eyes.of131cases Linearly control the phaco power.Then analysis the phaco power,elapsed time and complication in three phases by turns.

目的 探讨脉冲乳化方式在超声乳化术初期阶段的应用方法对131例150眼白内障在乳化晶状体核时选用脉冲频率6～10次/s，线性控制能量，依序分三阶段进行分析所用超声能量、乳化时间以及并发症情况。

Methods Set impulse frequency at6-10/second when emulsifies the nucleus in150eyes.of131cases Linearly control the phaco power.Then analysis the phaco power,elapsed time and complication in three phases by turns.

对131例150眼白内障在乳化晶状体核时选用脉冲频率6～10次/s，线性控制能量，依序分三阶段进行分析所用超声能量、乳化时间以及并发症情况。

Throughout the research on on-line monitoring system of power cable insulation, the working principle, systemic structure and procedure of data of on-line monitoringbased on the different frequency method is presented, and favorable principle foundation and practice experience are provided for on-line monitoring technology for cable insulation which can well apply into practice and safe, convenient and rapid obviating cable fault in power system.

本文通过对电力电缆绝缘在线监测系统的研究，提出了基于差频法的在线监测的工作原理、系统结构以及数据处理方案，从而为更好的实际运用电缆绝缘故障在线监测技术，为电力系统安全、方便、迅捷的排除电缆故障提供有利的理论依据和实际经验。

In order to avoid the negative impacts from islanding operation, a novel islanding detection method based on Power Controlling is presented in this paper, The method continuously perturbs the reactive power supplied by dispersed generation systems while simultaneously monitoring the point of common coupling voltage and frequency.

为了避免分布式发电系统在孤岛情况下运行，本文提出了一种基于功率控制的孤岛检测方法，这种方法使分布发电系统提供不断变化的无功功率，同时检测公用连接点的电压和频率。

In another embodiment, the polymerizing chemistry provides to use a high frequency coupled power to energize at low pressure at a relatively low power.

在另一个实施例中，该聚合化学反应提供使用高频耦合电源在相对低的功率在低压激发。

The method retrenches PLL circuit,not bound by frequency offset and measures the fundamental current accurately when the network voltage is distorted or asymmetric.A simulation model of voltage source high power active power filter system is found in Matlab/Simulink software.

本文在Matlab/Simulink软件中搭建出系统仿真模型，并与采用单个PWM变流器的有源电力滤波器比较，验证了本文设计的方法能够在较低的器件开关频率下实现较好的补偿效果，具有良好的工业应用前景。

This study suggests that GaN-based TEDs have significant advantages for high-frequency and high-power microwave generation,which are perspective for high-power THz signal source applications.

本工作揭示出GaN转移电子器件在高频率和大功率输出方面都具有重要优势，作为大功率THz微波信号源将具有广阔的应用前景。

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。