电磁干扰

Point out the electromagnetism signal produced by human campaign not be noise completely, in which, part has formed useful signal. Analyse through error theory, have gotten the mathematics relation of phase error and apparent resistivity error.

引入CSAMT的理论，对MT勘探中电干扰和磁干扰进行了研究，从理论上证实了磁场的信噪比要优于电场的，指出人类活动所产生的电磁信号并不全部是干扰，其中一部分构成了有用信号。

Because any reports on the active control of rotating disk haven't be seen in China up to now, and this experiment research is important, so the complete set of active control system of rotating disk are built independently. The push-pull type electromagnet is applied to control the vibration of the circular disk. The power amplifier circuit that can respond to wide scope in frequency from DC to AC is designed by improving the existing circuit. The sensor signal is first low-pass filtered, then the proportional control plus the differential control circuit easy used in practice are applied to finish the more effective control. The electromagnetism shield is used as possible to decrease the signal disturbance from the electromagnet to eddy sensor.

考虑到目前国内尚未见到有关旋转圆盘振动主动控制的相关报导以及实验的重要性，自行设计制作了一整套旋转圆盘振动主动控制系统：提出并采用推拉型电磁作动器来控制圆盘的振动；在改进现有电路的基础上，自行设计了具有较理想特性的驱动电磁作动器的功率放大器；根据实际控制环境的特点，设计了先进行低通滤波，再采用比例和实用的近似微分电路构成的控制器，并采用了电磁屏蔽来减小电磁铁对传感器的干扰，以实现更有效的控制。

The research and development of visualization system of electromagnetic environment monitor is very necessary, and it is very important significance. It can assure the quality of communication for avoiding the interface of electromagnetic signal, live up to reasonable layout and distribution for the construct of mobile communication station and radio monitor station, reduce the endangerment electromagnetic radicalization for surrounding environment and body of people.

为了避免电磁信号之间的相互干扰，保证通信的质量；为了对移动通信基站或无线电监测站的建设，做到合理的规划和布局；为了减少电磁辐射对周围环境和人体的危害，研究并开发电磁环境监测可视化系统就显得很有必要，具有十分重要的意义。

This paper presents research on the intersystem prediction and analysis of electromagnetic compatibility to the radio systems positioned by the geographical longitude and latitude coordinate system and the elevation system.

本文对处于陆上局部区域内的、以经纬度地理坐标系和高程系进行定位的无线电系统间的电磁兼容性预测进行了研究，以对系统间的相互干扰情况作出预测，给解决局部区域中无线电系统间相互干扰问题的方案提供支持，以避免在系统布置、安装完成之后出现相互干扰情况而使系统性能下降，甚至失效，造成资金和时间的浪费。

To analyze the intersystem EMC more distinctly, the method based on port data is presented. The coupling relation between ports is analyzed and the corresponding figure is drawn in the method. EMC of the intersystem can be analyzed by coupling-function and the interference data of port, which are obtained from test .calculation or specified standard.

为了更清晰地分析系统内电磁兼容性，提出了基于端口数据的系统级电磁兼容性分析方法，该方法分析系统内各部件端口之间的耦合关系，画出耦合关系图，然后根据端口的干扰数据（测试、计算或标准规定的数据）和传递函数分析系统的电磁兼容性。

The applied products had already been developed and are operating during the probative period in power system. The major electromagnetic interference sources and their characteristics in working surroundings of ECT are discussed.

研究了电子式电流互感器工作环境中主要电磁干扰源及其特性，采取了有效的干扰抑制措施，保证了TECT-10型样机的电磁兼容性。

The various functions of the apertures are essential to the shielding box. Electromagnetic pulse couples into the shielding box through the "back-door coupling", which inevitably interferes with or damages the electronic components used in the shielding box.

而屏蔽机箱上各种功用的孔缝是必不可少的，电磁脉冲通过&后门&耦合进入屏蔽机箱，并对其内的电子元器件进行干扰或毁伤则是不可避免的，也是电磁脉冲进入屏蔽机箱的重要途径之一。

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。

Accident prevention;Anaesthesiology;Classes of protection;Classification;Clearances;Colour codes;Definition;Definitions;Dimensions;Earth conductors;Earthing;Electric appliances;Electric mains;Electrical appliances;Electrical engineering;Electrical medical equipment;Electromagnetic compatibility;Electromedicine;Electrostatics;EMC;Environmental conditions;Equipment;Equipment safety;Explosion protection;Graphic symbols;High frequencies;High frequency surgery;Impact testers;Insulations;Interference rejections;Interferences;Interfering emissions;Leakage paths;Letterings;Lists;Low frequencies;Marking;Measurement;Medical equipment;Medical sciences;Medical technology;Operational instructions;Protection coverings;Qualification tests;Radiation protection;Radiofrequency apparatus;Safety;Safety devices;Safety engineering;Safety requirements;Specification;Strength of materials;Surveys;Symbols;Temperature;Test equipment;Testing;Testing voltages;Transformers

中文主题词事故预防；麻醉学；防护等级；分类；清除；色码；定义；尺寸；接地导线；接地；电气器具；电源；电气设备；电气工程；医用电气设备；电磁兼容性；电医学；静电学；EMC；环境条件；设备；设备安全；防爆；图形符号；高频；高频外科学；冲击试验器；绝缘；干扰抑制；干扰；干扰辐射；漏电路径；文字书写；表；低频；作标记；测量；医疗设备；医学科学；医疗技术学；操作说明；保护覆盖层；合格试验；辐射防护；射频设备；安全；安全装置；安全工程；安全要求；规范；材料强度；调查；符号；温度；试验设备；测试；测试电压；变压器

This system ofcompatible electromagnetism of frequency spectrum has someimportant functions listed as follows:(1) Analysis disturbance of the same or adjacent frequencies (2) Analysis of performance of radio link (3) Analysis of intermodulation (4) Automatic selection of frequency(auxiliary assignment of frequency)(5) Prediction of region of radio field intensity (6) Harmonization of frequency border (7) Analysis and design the system of microwave and satellite earth station.(8) Generate photographs This paper realizes the function of harmonization analysis ofthe system of microwave and satellite earth station. The concretework includes:(1) Based on the propagation model of radio wave,computing the absorption loss of atmosphere of microwavecommunication system and its fading, simulating the receivingvoltage and realizing the computation of disturbance andharmonization between microwave station and earth station.

频谱电磁兼容分析系统主要实现以下几个功能：⑴同、邻频干扰分析⑵无线链路性能分析⑶互调分析⑷频率自动选择⑸场强覆盖预测⑹边界协调⑺微波与卫星地球站系统设计和干扰协调分析⑻图形制作功能本文做为全省建设的电磁兼容分析系统的一部分，实现了微波站与地球站干扰协调分析这一功能，具体有：⑴以无线电波自由空间传播为模型，对微波通信系统的大气吸收损耗和衰落储备量进行了计算、对接收电平进行了模拟仿真，实现了微波- I -吉林大学硕士学位论文 Abstract站与地球站之间的干扰与协调计算。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。