工频

Because the biggest characteristic of ECG and pulse signals is very weak, vulnerably to external signal interference, such interference, mainly caused by mobile electrode baseline drift (generally less than 1Hz), power-frequency interference (50Hz), EMG Interference.

由于心电信号和脉搏信号最大特点就是信号十分微弱，容易受到外部信号的干扰，这些干扰主要来(来源：7bABC论文网www.abclunwen.com)自电极移动引起基线漂移(一般小于1Hz)，电源工频干扰(50Hz)，肌电干扰。

The hardware compositions of EMG acquisition system are showed in the 4th chapters, the methods of filtration and dislodging 50Hz disturbance are special focused on.

第四章介绍了肌电信号采集系统的硬件组成，重点是对滤波方法和去除50Hz工频干扰做了详细的介绍。

The article adopts "humidity ratio" integrated emendation method and other two traditional emendation methods in emendation calculating on several group test results. The tests are : simulating test in artificial climate room on 110kV substation equipment of Yangbajing, Lasa and Yanghu by Xi"an High Voltage Lab; power frequency voltage discharge test of ZS-110 by Yunnan provincial electrical research academy. It compares and analyses the equipment test voltage emendated to standard atmosphere conditions with the equipment nominal withstanding voltage. And then it concluded that: the emendation value educed by "humidity ratio" integrated emendation method is basically equal or close to the equipment nominal withstanding voltage; but the values by two traditional emendation methods are mostly higher.It also proves that,"humidity ratio integrated emendation method is more perfect than any other methods, and it can reflect the influence degree of atmospheric parameters on electrical equipment outer insulation discharge voltage actually. The method should be spread in designing high elevation power projects.

文中选择&比湿&综合校正法和两种传统校正法，分别对西高所为羊八井、拉萨、羊湖110kV变电所设备所做的人工气候室模拟试验数据及云南中试所做的ZS-110工频放电电压试验数据进行校正计算，将试验电压的校正值与试验设备的标称耐受电压水平进行比较分析；认为：&比湿&综合校正法的校正值与设备耐受电压水平基本相等或接近，而两传统校正法的校正值大多高于设备耐受电压水平；进一步证明，&比湿&综合校正法是目前诸多校正法中较为完善的，能真实地反映大气参数对电气设备外绝缘放电电压的影响程度的校正法，在高海拔电力工程设计中应推广应用。

However, the heat effect of voids' discharge was not great in the line-frequency field.

但实验表明，在工频电场下，气孔放电产生的热效应并不大。

In recent issues, Analog Dialogue has dealt extensively with topics in shielding and grounding,[1,2] emphasizing the techniques needed to protect the integrity and precision of analog signals in the dc and audio-frequency domain from interfering signals, whether at line frequency or at much higher frequencies.

摘要近几期的Analog Dialogue 着重对屏蔽和接地问题进行了广泛的探讨，强调这些技术在直流和音频范围内对保证模拟信号的完整，精确，免受工频或更高频率的干扰方面将起到作用。

The geothermal reservoir and cap rock were interpreted.

利用北京大学研制的BD-6型被动式超低频电磁探测仪在京热119井和168井附近布点探测，在探测过程中利用硬件滤波和水平旋转探头方向的方法消除了工频50Hz的部分谐波干扰，同时探测曲线的重复性也非常好，得到了相应井位的超低频电磁探测数据。

Major equipment has: 2M X 10M ordinary lathe, 250 and below, various types of boring machine specifications, 5M roll 7M double column vertical lathe comb, 100X6M deep-hole drilling, 3M X12M gantry milling bed, HR Two-table machining centers, CNC boring 130 milling machine, frequency, medium frequency quenching machine, 15T electric furnace, etc..

主要设备有：2M X 10M普通车床、250及以下规格各类镗床、 5M 辊梳齿 7M双柱立车、 100X6M 深孔钻、3M X12M 龙门铣刨床、HR双工作台加工中心、130数控镗铣床、工频、中频淬火机床、15T电炉等。

Finally, the glass cover slip was sealed with 90% glycerol and nail enamel, and the cells were viewed and photographed using confocal microscope (Leica TCS-SP) with 100x objective.

结果显示0.1mT强度的工频磁场在处理24h内不能诱导P38 MAPK磷酸化，0.4 mT磁场辐照处理10min后可短暂诱导P38 MAPK磷酸化。

Based on the discussion of some problems, it is pointed out that mountingadditional lightning arrestors on both ends of overhead lines is an effective means toprotect outlet CB of substations.

就事故分析提出了几个值得探讨的问题：事故与断口两侧有工频电源有关；雷击波的陡度值处于外绝缘大于内绝缘的区域和电压抽取装置的削波作用不显著而使灭弧室内绝缘击穿；外绝缘先击穿或内、外绝缘同时击穿；事故与雷击进线段发生绕击或反击的关系是主要的还是次要的。

It adopts the single chip computer control calculation meritorious service capacity, and parameters such as real power, reactive power, meritorious service rate element, tension fundamental harmonic virtual value and tension harmonious wave virtual value and so on these are separation to the calculation branch to the measurement that on the basis of the scattered integration formula in immediate future scattered Fourier transformation, the exchange basseted on to power system parameter sampling idea was achieved to adjust all the journey moreover the frequency alternating current frequency and the tension virtual value as well as the electric current virtual value in the way of software .

它采用单片机的控制运算功能，根据离散积分公式即离散傅立叶变换，基于对电力系统参数进行采样的思想，实现同时对一路工频交流电的频率、电压有效值、电流有效值的测量，用软件计算分析出有功功率、无功功率、功率因素、电压基波有效值、电压谐波有效值等参数。

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。