消失场荧光测量的理论和应用研究

消失场荧光技术已被广泛应用在工业、生物和医学等领域的研究工作中．本文给出各种分层结构中消失场分布的严密电磁理论．在生物和医学上，利用受激荧光强度正比于局部电场能量的规律，可根据测得的相对荧光强度算出细胞和基板的间距．文中还给出一些消失场荧光测量的应用．     

An Asymptotic UTD Solution for the Scattering by an Impedance Wedge at Skew Incidence

Asymptotic expressions for the fields scattered by an isotropic impedance wedge at skew incidence are derived in the frame of the uniform geometrical theory of diffraction （UTD）. They are obtained by approximately solving the difference equations generated from impedance boundary con ditions （IBCs） in Maliuzhinets＇ approach. The method overcomes the discontinuity of the nonuniform evaluation given in the literature referred and can give out satisfactory numerical results.     

Linear sand ridges on the outer shelf of the East China Sea

Based on the latest full-coverage high-resolution multi-beam sounding data, the distribution of the linear sand ridges on the outer shelf of the East China Sea （ECS） is studied with quantitative statistical analysis. The study area can be divided into the northeastern part and the southwestern part. Sand ridges in the northeastern area, trending 116°N, show obvious linear character and shrink to the inner shell Sand ridges in the southwestern area, trending 120°N -146°N, tend to have net form. Sand ridges gradually become sand sheets in the center part of study area. Sand ridges are distributed landward to the isobath of 60m, distributed seaward to the water depth of 120 m in the northeast and 150 m in the southwest. Immature sand ridges are observed at water depth of 130-180 m in the southwestern depressions. The acoustic reflection properties of the internal high.angle inclined beddings of the sand ridges are analyzed based on the typical seismic profiles close to the research area. Lithological analysis and dating of 4 boreholes and 12 cores indicate that the widely distributed transgressive sand layer with high content of shell debris which was formed in the early-middle Holocene is the main composition of the linear sand ridges on the outer shelf of the ECS. The dominating factor in formation, developing and burying of the sand ridges is the variation of water depth caused by sealevel change and the rate of sediment supply. In 12400 aBP the cotidal lines of the M2 tidal component were closely perpendicular to the strike-directions of the sand ridges in the study area, and the tidal wave system during 12000-8000 aBP might play a key role in the formation of the linear sand ridges which are widely distributed on the outer shelf of the ECS.     

时变电磁场作用下金属熔体中的Lorentz力分析

运用电磁互感耦合原理，对时变电磁场中金属熔体凝固过程中的受力进行了分析，并运用ANSYS5．7软件进行了数值模拟。结果表明，在时变电磁场中，液态金属受勤大小随时间周期变化的Lorentz力作用，使得金属熔体在凝固过程中获得无接触搅拌。     

圆坯连铸结晶器电磁搅拌数学模拟

用数学模拟对马钢一钢厂圆坯连铸结晶器(断面尺寸为φ450mm)电磁搅拌过程进行了研究,找出变化规律,确定合理的工艺参数,优化结晶器流场.电磁搅拌过程的计算结果表明:磁场强度随搅拌频率减小、搅拌电流增大而增大;电流强度不改变磁场分布;在结晶器高度方向上磁场分布呈现中间大两端小的特征,流场在搅拌力作用下更趋于合理.最佳搅拌工艺参数为:搅拌电流350A,频率2Hz.     

频率对矩形电磁连铸结晶器内磁场和弯月面的影响

研究了在电磁软接触连铸过程中,电源输入频率的变化对矩形电磁软接触结晶器内的磁感应强度分布规律和弯月面变化情况的影响.结果表明:当电源输入频率增大时,结晶器内的磁感应强度减小.电源输入频率的改变不影响结晶器内磁场分布的相对均匀性.弯月面的高度与电源输入频率成反比,频率越高,弯月面稳定性越好.在实际生产中,如果需要提高电源输入频率,则应该同时适当的增大电源功率来弥补激励电流的减小,以保证软接触效果.     

开关电源的电磁干扰分析及抑制

针对开关电源电磁干扰的形成原因,提出了几种降低和抑制电磁干扰的方法.实际应用表明所提方法不但可行而且可以提高开关电源的电磁兼容性.     

济南市典型电磁辐射体监测与评价研究

在对济南市广播电磁辐射设施进行摸底调查的基础上,选取该市广播电磁典型辐射体,监测不同条件下的电磁强度变化,根据国家标准制定评价原则,评价分析典型电磁辐射体的强度变化规律,为济南市城市规划和广播电磁辐射监管提供技术支持。     

波在周期磁化均匀等离子体中的反射

采用分层介质方法处理周期磁化均匀等离子体层,研究了电磁波射向周期磁化等离子体层时电磁波的反射特性,分析了等离子体电子密度,电子碰撞频率以及外加磁场等因素对电磁波反射的影响,得出一定条件下等离子体密度和电子碰撞频率下等离子体对电磁波的反射特性。     

智能防水垢器的设计及实现

主要介绍利用微电脑控制实现高频电磁场,使水中的水分子以及钙、镁盐晶体的物理性能发生变化,并与该电磁场产生共振,形成电磁场活化水,它具有防垢、除垢、杀菌灭藻、缓蚀的能力,该方法具有可实施性,是实现全自动防垢、除垢的一种较佳方法。