It is found that the fwm field can cause the asymmetry of electromagnetically induce transparency profile . in addition , the effect of different propagating orientations of probe field on the electromagnetically induced transparency is also discussed . in the molecular multi - level system with the perturbed superposition levels , we discuss the electromagnetically induced transparency , spontaneous emission enhancement , double dark resonance and double electromagnetically induced transparency by using the density matrix equation under weisskopf - winger approximation and dressed - state density matrix equation 针对实际的实验条件，考虑了一种影响量子干涉的新的因素-四波混频场，研究了四波混频场对双光子探测的-型能级体系的eit的影响，发现四波混频场能够导致双光子探测的eit线型的不对称，在此基础上，讨论了不同探测场的传播方式对eit的影响，针对分子中实际存在的包含有微扰能级的不同多能级系统，我们分别采用缀饰态绘景下的密度矩阵方程和weisskopf - wigner近似下的密度矩阵方程详细地讨论了电磁感应透明、自发辐射的干涉相消和相长、双暗态共振和双电磁感应透明现象。
Experiment results show that such burners are safe enough , feature good adaptability in operation and ease of use , have litter investment , are provided with good economical benefit , etc . they have broad prospects for use in utility boilers that consume no oil for ignition and maintain the stability of flame 试验结果表明，本燃烧器具有安全可靠、适应性强、操作方便、投资小、经济效益高等优点，在电站锅炉无油点火方面有着广泛的应用前景。本文应用电磁感应加热无油直接点火技术，对吉林热电厂5号炉进行实际工程应用设计，并取得点火成功。
At present , there are various methods of moving vehicle detector and identification . the system we designed for traffic information makes use of the principle of electromagnetic induction and radio frequency identification the moving vehicle detector , which is based on inductive circular loop , detects the information of vehicle according to the inductive signal . the basic information including speed and go through time can be detected to analyze oscillator frequency 目前现行的车辆检测与识别系统的种类繁多，本系统基于电磁感应理论和射频识别技术，采用环形线圈作为数据采集传感器，通过对振荡器的频率计数测量到车辆的通过、速度等基本信息，同时启动射频识别系统，使读写器与安装在车辆上的非接触ic卡进行无线通讯获取通过车辆的类型和所属用户等数据，并将有关数据通过rs232串口送至上位机。
Induction heated oil tempered spring wire is a kind of new technical material which has been developed since 1980s . it can be heated by means of eddy induced into itself through electromagnetic coil and this method is mainly used in surface quenching . with correct designing and reasonable current frequency , induction coil and heat treatment process selected , as well as plc controlling applied , the wire can be uniform heated along cross - sectional and longitudinal direction and can be quenched and tempered continuously 应加热油淬火-回火弹簧钢丝，是二十世纪八十年代发展起来的新技术材料，在国外称为itw induction heat oil tempered spring wire 。是通过线圈电磁感应钢丝本身产生的涡流进行加热，通常主要用于表面淬火。经正确设计，选择电流频率，合理的感应线圈及热处理工艺，并实施plc控制，可使钢丝整个截面及长度上得到均匀加热，进行连续整体淬火和回火。
The research interests in this team are nonlinear optics at low light intensities , including photorefractive nonlinear optics ( photorefractive materials , effects and their applications ) , optical storage materials , nonvolatile optical recording technology and mechanics with high recording rates , high data density and high data transfer rates , nonlinear dispersive system and the dynamic propagation properties of photons in such dispersive system , and nonlinear optical properties of phasonian systems such as electromegnetically induced transperancy 本实验室目前从事弱光光学非线性方面的研究：主要包括光折变非线性材料、效应以及应用；超快超高密度光存储材料、非挥发存储技术及其机理；非线性色散系统以及光子在非线性色散系统中的传播动力学；量子相干系综中的非线性光学性质如电磁感应透明等几个方面的研究。
Shanghai banghua packing machinery co . ltd is the property of shanghai sangke electromechanical machinery co . ltd . we specializes in designing and manufacturing the equipments of code printer series ， auto - shrinking machine series ， induction cap sealer series etc ， and also provides good quality and bargain packing materials 上海榜华包装机械有限公司隶属上海桑科机电设备成套工程有限公司，专业设计、制造日期批号喷码打码机；热收缩包装机；电磁感应铝箔封口机；定量灌装机、充填封口机等系列包装产品，同时为企业提供质优价廉的包装材料。
In this thesis , the structur principle tal the systein project of coodess ic card were investigated and the reader was also designed . the main researches are as follows : . firstly , an equvalent circuit model of the indution power sapply of contatless ic card was presented by anaiyzing its work principle 本论文研究非接触ic卡原理，设计读写器具，提供系统方案，主要进行了以下几个方面的工作：首先，通过分析非接触ic卡感应电源天线近区场和电磁感应原理工作原理，建立了非接触ic卡感应电源的等效电路模型，用ewb软件进行了电路仿真，与实际测试结果比较，证明了建立的感应电源电路模型是正确的。
