Calculation of angular glint in near field utilizing graphical electromagnetic computing

The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） is proposed. With the benefit of the graphic card, the GRECO prediction method is faster and more accurate than other methods. The proposed method at the first time considers the special case that the targets cannot be completely covered by radar beams, which makes the prediction of radar tracking errors more self-contained in practical circumstances. On the other hand, the process of the scattering center extraction is omitted, resulting in possible angular glint prediction in real time. Comparisons between the simulation results and the theoretical ones validate its correctness and value to academic research and engineering applications.     

浅析平朔安太堡矿区采空区瞬变电磁异常特征

应用瞬变电磁勘探方法对平朔煤矿采空区进行勘查,介绍了瞬变电磁法野外数据采集技术,并对采空区的瞬变电磁法视电阻率异常特征进行了分析,推断了采空区平面分布范围并经钻探验证。通过对瞬变电磁资料、地调资料、钻探资料综合解译,分析了平朔煤矿安太堡矿区不充水采空区瞬变电磁法呈现低电阻率异常特征的原因。     

基于WLAN技术的楼宇内网络建设方案及其高频电磁辐射测试分析

基于WLAN技术设计了一种楼宇内网络建设方案，给出了该方案的详细设计步骤，包括频谱环境分析、规划设计、安装施工、测试和验收共5个阶段重点论述了设计阶段，对设计阶段的关键技术进行了深入的探讨，给出了合理的解决方案．对WLAN信号的高频电磁辐射进行了专门的实验测试，并将测试结果与国家标准进行了对比，证明其对人体健康没有影响．     

Intrinsic abnormal electromagnetic medium based on polar lattice vibration

A new class of media with abnormal electromagnetic parameters has been attracting increasing attention because of its exotic properties and potential application. Currently, typical metamaterials are mainly composed of artificially designed metallic periodic structures. However, due to the limitations of available fabrication technologies, physical size and material effects, it is difficult to realize these abnormal properties by these artificial structures in the high-frequency regime. Therefore, it is important to find materials with intrinsic abnormal electromagnetic responses. In this field, a new mechanism based on the interaction between polar lattice vibrations and electromagnetic waves has been proposed. In this paper, we review progress in this field.     

电磁能量、机械能和焦耳热

电磁体系能量守恒定律中的“机械能量”应是带电体动能与焦耳热能之和。本文通过一个置于变化外磁场中带电导体圆筒的例子说明这一点,并且利用欧姆定律和电磁体系角动量守恒验证该结论的正确性。     

谈物理教学中的科学方法论教育

本文对科学方法论教育的重要意义,及物理教学中如何进行科学方法论教育作了初步探讨.     

汞润触点继电器超小型化技术的研究

采用积分模型等效磁路的方法对继电器的电磁系统进行了分析计算和实验研究。为了提高计算精度，提出了等效漏磁阻修正系数的计算公式。考虑了实践中的物理和工艺方面诸因素，对结构参量进行了合理调整，研制成常开触点型和转换触点型超小型汞润触点开关管和继电器。     

继电保护装置常用电路元件及电磁继电器的数字仿真研究

本文采用四阶吉尔(Gear-4)算法建立了保护装置中常用电路元件及电磁分继电器线圈的友模,提出了电磁继电器用其电路的友模节点方程与其机械运动部分的微方程的接口算法,从而使友模法能更精确地求解含有电磁继电器的继电保护装置的暂态过程。经算例验证,本接口算法是简便、有效的。     

任意运动带电粒子的速度场

本文计算了任意运动带电粒子与速度有关的电磁场,并讨论了这种电磁场的分布特点及其运动规律。