电磁

Electromagnetic Separators main product, permanent magnet Separators, magnetic separator, the magnetic drum, lifting magnet, metal detectors, electromagnetic vibration feeder, Qiao products are widely used in electricity, cement, building materials, Coal, brick and tile, metallurgy, paper, chemicals, rubber, glass, mining, and other industries.

产品主要有电磁除铁器、永磁除铁器、磁选机、电磁滚筒、起重电磁铁、金属探测仪、电磁振动给料机等，产品广泛诮用于电力、水泥、建材、煤炭、砖瓦、冶金、造纸、化工、橡胶、玻璃、矿山等众多行业。

A mathematical model of the Secondary Cooling Segment Electromagnetic Stirring in the billet Continuous Casting is proposed according to the theory of alternating magnetohydrodynamics and magnetic boundary renewal method, then the cause of electromagnetic Stirring phenomena and the effect of operational condition were investigated.

根据正弦时变电磁场条件下的电磁流体力学基本理论及磁场边界更新法，建立了方坯连铸二冷区电磁旋转搅拌的数学模型，并对电磁搅拌的机理和操作条件的影响作用进行了探讨。

Based on the EMI coupling paths model of the off-line PWM switched mode power supply, sensitivity analysis of the component parameters in the model can be conducted and the key component parameters will be found. This method can be used in the EMC debugging and the EMI forecasting of power electronics equipment.

在本文对离线式PWM开关电源电磁干扰传播通道所建模型基础上，可以实现对模型中各元件参数灵敏度的分析，找到关键影响参数，为开关电源电磁兼容调试和电磁干扰预测提供有效的指导。

Summary In this paper, a brief history review of works on the theory of electromagnetic flowmeters is given. A method named'Alternative iteraction method for approaching real boundaries'is presented to solve Laplace's equation with mixed boundary conditions in electromagnetic flowmeters. The orthogonal expansion is used to analyze weight vectors and flow distribition effects on the sensitivity of the flowmeters.

本文在总结和分析了前人在电磁流量计变送器方面的理论研究成果后，首次提出了"交替迭代逼近边界"的方法求解电磁流量计理论研究中遇到的Laplace方程的混合边界条件问题；采用正交函数展开的方法研究权函数以及被测流体速度分布不规则对仪表输出的影响；采用保角变换的方法首次求解出电磁流量计偏心环域上的权函数。

An array of permalloy core solenoids is micromachined as microactuators on (100) silicon wafer. Then anisotropic etching of silicon in KOH solution forms the U-grooves beside the microactuators. The micromachining difficulties from the coexistence of 3-D MEMS devices and deep grooves on chip are overcome successfully. Then two fibers and permalloy piece are assembled onto the wafer together with the microstructures finishing the prototype of the new type MEMS VOA. Third, the inductance, resistance and Q value of the microfabricated solenoids are measured in the frequency range of 1-40 MHz.

第二，新开发了使用SU-85的正胶、负胶复合微加工工艺，在（100）硅片上加工了新型可变光衰减器的铁芯MEMS螺线管型电磁微执行器阵列；用KOH水溶液对（100）硅片进行湿法刻蚀，在电磁微执行器旁边微加工了V形槽结构组合，开发了单片集成三维MEMS器件和深槽的微加工关键技术；然后经过微装配制作出了电磁驱动的光纤偏移型MEMS可变光衰减器的样机。

Including setting up system platform and measuring structure of the rigidity of pretension spring of the solenoid valve, designing the dynamic electric-current driver on the basis of power sink principal, variable pulse width modulation of voltage boosting and inversion technology, realizing the intelligence controlover the control parameters, satisfying the diversity requirement towards the dynamic feature experiment of the solenoid valve; furthermore, testing system software is developed, and filtering is conducted over the signals of armature displacement response and driving current educed from the experiment using wavelet analysis technology.

构建了系统台架和电磁阀预紧弹簧刚度测量机构，设计了基于功率吸收原理和可变脉宽升压逆变技术的电磁阀动态电流驱动器，实现了对驱动器参数的智能控制，满足了对电磁阀动态特性试验的多样性要求。开发了测试系统软件，提出了基于小波分析的方法，对试验所得衔铁位移响应信号和驱动电流信号进行了滤波。

Chapter 3 gives the theoretical analyses to Q-factor of electromagetic open resonator due to the mirror loss、mirror diffraction loss、coupling aperture loss and inserted dielectric specimen loss in detail by means of the incremental frequency rule and the small aperture coupling theory, and obtains the more precise formulae for calculating Q-factor.

在第三章利用电磁开腔的复数源点理论以及频率增量法和小孔耦合理论，分别对电磁开腔镜面反射损耗、镜面衍射损耗、耦合孔损耗以及介质样品损耗引起的品质因数进行了深入的理论分析，得到了电磁开腔品质因数更为精确的计算公式。

Shelter accessories: shelter air conditioner, electromagnetic screen, EMC professional manufacturer, electromagnetic shielding chamber, shielded gate, shielded machine room, NMR shielding chamber, high-voltage partial discharge shielding, electromagnetic protection chamber, copper mesh shielding room, shielding cabinet, microwave unreflected chamber, filter, honeycomb air-vents window, satellite earth station antenna, communication electronics, information system; large-screen command and control system; ruggedized computer technology and equipment, computer information system safety products; dual-use radar system, weather radar, microwave device and RF and microwave components, dual-use electron component and cable, connector and sensor etc.

方舱附件：方舱空调、电磁屏蔽、EMC专业制造商、电磁屏蔽室、屏蔽门、屏蔽机房、核磁共振屏蔽室、高压局放屏蔽、电磁防护室、铜网屏蔽房、屏蔽柜、微波暗室、滤波器、通风波导窗、卫星地面站天线、通信电子、信息系统；大屏幕指挥与控制系统；加固计算机技术与设备、计算机信息系统安全产品；军民两用雷达系统、气象雷达、微波器件及射频微波产品、军民两用电子元器件及线缆、连接器、传感器等

The main principle of the DCcontactor:The electromagnetism coil switches on electricity thetitle iron to match with the iron heart on,the suction of theelectromagnetism system overcomes the counterforce of the springarouses the action of the contact, the main electric circuitconnected;The electromagnetism coil cuts the power the counterforceof the spring arouses the title iron from move to open, the headcontact breaks to open the output electricity arc give or get anelectric shock in drive to arc-extinct-chamber and made longer,thestrong cooling dissociates and put out,the main electric circuitcuts off.

接触器的主要原理：电磁线圈通电，衔铁和铁心吸合，电磁系统的吸力克服弹簧的反作用力带动动触头与静触头接触，主电路接通；电磁线圈断电，弹簧的反作用力带动衔铁和动触头弹开，触头断开产生的电弧在灭弧室中受到磁吹灭弧和电动力驱动被拉长，并强烈冷却去游离而熄灭，主电路切断。

By applying electromagnetic vibration on solidification front of Sn-10Pb alloy,creation of equiaxed grain zone in ...

在低强度电磁振荡条件下，凝固组织细化和等轴晶化的原因是：电磁振荡力对金属初生晶的周期性拉伸、压缩、剪切、折弯、扭转等机械作用，使其出现断裂和剥落，增加形核数量；电磁振荡的局部搅拌作用使固/液界面前沿的温度和成分趋于均匀化，导致梯度降低，抑制了柱状晶的生长。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。