工频

工频参数测量装置中数字滤波器的Delphi和Matlab实现

Design digital filter using Delphi and Matlab for power frequency parameters measure apparatus

电流互感器（TA）饱和会给基于工频电气量的输电线路故障测距精度带来很大的误差。

Current transformer TA saturation may cause great errors of fault location based on power frequency quantities .

双向工频通信系统（TWACS-TwoWayAutomaticCommunicationSystem）是上世纪九十年代在美国出现的一种基于电力配电网络的通信系统。

Two Way Automatic Communication System ( TWACS ) which appears in U.S.A. in 1990s is a communication system based on the power distribution network .

心电信号中工频干扰的消除RNA干涉技术

Elimination of Power - line Interference from ECG Signals RNA interference

基于CPLD技术工频相位测量中电压信号量程自动切换

Voltage Signal Range Automatic Switch of Industrial Frequency Based on CPLD Technology

此外，工频噪声也利用了ICA方法来去除。

Besides , Power line noise was also removed by ICA method .

RT-PCR分析工频磁场暴露后MCF-7细胞p53mRNA的表达

Analysis of p53 mRNA expression in MCF-7 cells exposed to power-frequency magnetic fields

10～500/3~（1/2）kV工频电压比例标准装置

10 ~ 500 / 3 ~ ( 1 / 2 ) kV Power Frequency Voltage Ratio Standard Apparatus

SVC对限制超高压输电系统工频过电压的影响

Effect of SVC on restricting the temporary overvoltage of EHV transmission system

并联电抗器中性点和中性点小电抗XN的绝缘水平主要决定于出现在XN上的最大的工频电压VN。

The insulation level of neutral of shunt reactor and of its neutral reactor X_a is determined mainly by the power frequency voltage arised on this reactance .

工频磁场对P38丝裂原活化的蛋白激酶磷酸化的诱导作用

Exposure to power-frequency magnetic fields can induce activation of P38 mitogen-activated protein kinase

滤除SEMG工频干扰的数字陷波器设计

Design of digital trap filter for reducing power line interference in SEMG

户外AIS类型配电区工频电场强度整体水平最高。

The electromagnetic field strength level in the power distribution area of outdoor AIS type is highest .

结果工频磁场暴露4,8和24h，MCF-7细胞p53mRNA的表达水平保持不变。

RESULTS p53 mRNA expression in MCF 7 cells was not altered after exposure to magnetic fields .

一种消除ECG信号中50Hz工频干扰的数字滤波方法

A digital filter method for the elimination of 50 Hz interference from the ECG

眼动伪差和工频干扰是脑电图（electroencephalogram，EEG）中常见噪声，严重影响EEG信号提取和分析。

Blink artifacts and power noise are constantly found in EEC signals whose estimation and analysis can be strongly influenced by them .

通过试验，分析了8/20脉冲次数及电流峰值对ZnO压敏电阻工频耐受性能的影响。

Through experimental , the effect of 8 / 20 pulse number and current amplitude on power frequency voltage withstand capacity of ZnO varistors is analyzed .

目的观察工频磁场暴露对MCF-7细胞p53mR-NA表达的影响。

AIM To observe effects of power frequency magnetic fields on p53 mRNA expression in MCF 7 cells .

用ROC曲线评价中频和工频X线机管电压对影像质量的影响

Evaluation the influence of tube voltage mid-frequency and industry frequency X-ray machine to image quality by ROC curve

工频磁场对星形胶质细胞GJIC的影响

Effects of Power Frequency Magnetic Fields on GJIC of Astrocytes

工频磁场辐照导致细胞连接蛋白Cx43的异常移位

Abnormal shift of connexin 43 gap-junction protein induced by 50 Hz electromagnetic fields in Chinese hamster lung cells

为有效解决这一问题，开发了基于锁相环技术的变频-工频同步切换控制装置。将变频器作为压控振荡器（VCO）；

A VF-FF synchronous switchover device based on the PLL ( Phase-Locked Loop ) technology has been designed for it .

本文以自适应相干模板法为基础，讨论该方法在基于PC应用系统（如数字心电图系统）中去除工频干扰的快速实现问题。

On the basis of self-adapting correlation method , we attempt to address the problem of fast elimination of 50-Hz noise from the useful signals in PC-based application system such as digital ECG recording system .

研究了冲击电流波形对开关型电涌保护器（SPD）的工频续流的影响。

The influence of impulse current waveform on50 Hz continuous current of switching type surge protective device ( SPD ) was studied .

利用所研制的高精度无源单匝穿心式小电流互感器，建立了一种基于FFT的介质损耗测量方法，它可以有效地消除谐波和工频信号波形不工整的影响，并进行了实验验证。

Using the passive high-precision current transformer founds a method to measure dielectric loss based on FFT which can eliminate effects of harmonic and current frequency excursion and conducts an experiment .

用50Hz工频电压产生大气压下辉光放电

Atmospheric Pressure Glow Discharge Using 50 Hz Power Frequency Voltage

结论：这些研究提示本实验条件下50Hz0.4mT工频磁场暴露可能诱导CHL细胞自噬效应。

Conclusion : These data indicate the 50 Hz 0.4 mT MF exposure may induce autophagy in CHL cells under the experimental conditions .

研究开发了正温度系数（PTC）元件工频电流冲击特性计算机测试系统，详细介绍了系统的测试原理、硬件结构和软件设计。

An automatic measuring system for testing PTC alternating current impulse characteristics is developed . The measuring principle , hardware design and software design are described in detail .

研究了离网型逆变器，采用电压型单相桥式逆变电路，结合工频变压器和LC滤波电路将直流电逆变成交流电供给交流负载。

Studied off-grid inverter , using voltage-mode single-phase bridge inverter circuit , combined with frequency transformer and LC filter circuit to direct current into alternating current then supply AC load reverse .

50Hz的工频干扰是心电信号的主要干扰源，尤其在供电系统不稳定、外界环境适应性差时严重影响心电信号正确判断。

50 Hz power frequency interference is the main noise of ECG signal .