工频

Objective To explore the effects of strong power frequency magnetic fields on rabbits behavior and electroencephalography.

家兔 2 6只，随机分成两组，磁场组和对照组各13只，观察工频强磁场长期连续暴露，家兔行为及脑电图的变化。

It is consisted of two circuits: the high frequency converter and the electromagnetic switch contact state sensing circuit without any sensor. There are more advantages in this technology than in those dealt with the problems in commercial frequency.

提出了一种互补式开关新技术，它由两个新电路构成，即高频开关变换器与电磁开关触点状态无传感器实时采样电路由于以高频处理方式来解决此类工频电工问题，较传统方法有更多优点，因此具备了解决上述难题的条件。

Finally, several suggestions to improve the power frequency electric field beneath transmission lines are put forward.

最后，提出改善线路下方工频电场的措施。

With electronic controllers used occasionally on normal flourescent lights and usually on one-piece CFL's, extra circuitry is included which converts the 240V AC into DC, then back into AC but at a frequency of around 20 to 30 kHz (20,000 to 30,000 cycles per second), which usually eliminates any perceivable flicker.

在普通荧光灯中安装电子控制器，一般情况下通常在单管节能灯中安装这种电子控制器，并设计专门的电路用来将240V交流电转换为直流电，然后再转换成工频大约为20--30kHz（每秒钟20000到30000周期变化）的交流电。通常情况下，这种电灯能消除所有可视见的闪烁。

Based on this theory,and combined with Fourier transform frequency spectrum analysis and curve fitting ,the formula and arithmetic of equivalent mainfrequency for the frequency conversion measurement are derived.

本文正是基于这种变频法的思想，结合傅立叶变换频谱分析法和曲线拟合方法推导了介质损耗参数的工频等效计算公式和算法。

It is beneficial to develop transmission line arresters. The development of the transmission line arrester is reviewed in this paper. Base on the over-voltage of 220kV transmission line, the nominal discharge current of 220kV transmission line arresters with series gap is analyzed, and the technical parameter of ZnO blocks is confirmed.

本文介绍了线路避雷器的发展状况，根据220kV输电线路的雷电过电压情况，计算了220kV有外串间隙线路避雷器的标称放电电流，确定了氧化锌电阻片的主要技术参数，特别是避雷器本体直流1mA的确定，保证了避雷器的灭弧电压大于220kV系统的最大工频电压。

Powered by series 2000 diesel engine, series 2000 diesel generating sets are produced according to National Standard "GB2820 General Specifications for Industrial Frequency Diesel Generating Sets" and with reference to 《IEC34-I》?rotary generator standard, which equipped with high quality generator from domestic and abroad.

2000系列柴油发电机组是以2000系列柴油机为动力，按照国家标准《GB2820工频柴油发电机组通用技术条件》的规定，并参照《IEC34-I》国际电工委员会旋转电机标准，选配国内外优质发电机所生产的柴油发电机组。

The system has changed from previous high-water tanks and pumps for water supply mode, get rid of the shortcomings of the water supply instability, is a safe and reliable, fast and stability, energy saving, convenient maintenance and management of water supply control systems.

该系统改变了以往由高位水箱和工频泵供水的模式，摒弃了供水不稳定的缺点，是一种安全可靠、快速稳定、节能、维护和管理方便的供水控制系统。

Xin Electronics factory professional design, manufacture various models, specifications of the high and low power frequency transformer, inductance coil, rectifier and other manufacturers.

鑫利电子厂系专业设计、制造各种型号、规格的高低工频变压器、电感线圈、整流器等的制造厂商。

Characters of Cast Iron Melted in the Coreless Induction Furnace and ...

同时阐述了工频炉熔炼铸铁炉前控制的操作规范。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。