关键词： 动量定理   应用   电磁学   牛顿运动定律   牛顿第二定律   力电综合问题   力学规律   运动学公式  

摘要： 动量定理是根据牛顿第二定律F=ma和运动学公式v=v0＋at，在假设物体所受的力是恒力的情况下推导出来的重要力学规律，但它的适用范围却比牛顿运动定律广得多．特别是对变力问题，利用动量定律求解更是牛顿运动定律所无法替代的，因而它在力学中有着广泛的应用．同样，在处理力电综合问题时，

关键词： Electromagnetism   Electromagnetism   Mathematical models.   Data processing.  

ISBN: (数字)9780470829646 ISBN: (纸本)9780470829622

摘要： Essentials of Computational Electromagnetics provides an in-depth introduction of the three main full-wave numerical methods in computational electromagnetics (CEM); namely, the method of moment (MoM), the finite element method (FEM), and the finite-difference time-domain (FDTD) method. Numerous monographs can be found addressing one of the above three methods. However, few give a broad general overview of essentials embodied in these methods, or were published too early to include recent advances. Furthermore, many existing monographs only present the final numerical results without specifying practical issues, such as how to convert discretized formulations into computer programs, and the numerical characteristics of the computer programs. In this book, the authors elaborate the above three methods in CEM using practical case studies, explaining their own research experiences along with a review of current literature. A full analysis is provided for typical cases, including characteristics of numerical methods, helping beginners to develop a quick and deep understanding of the essentials of CEM. Outlines practical issues, such as how to convert discretized formulations into computer programs Gives typical computer programs and their numerical characteristics along with line by line explanations of programs Uses practical examples from the authors' own work as well as in the current literature Includes exercise problems to give readers a better understanding of the material Introduces the available commercial software and their limitations This book is intended for graduate-level students in antennas and propagation, microwaves, microelectronics, and electromagnetics. This text can also be used by researchers in electrical and electronic engineering, and software developers interested in writing their own code or understanding the detailed workings of code. Companion website for the book: ***/go/sheng/cem

关键词： electromagnetic complex media   electromagnetic waves   applied mathematics   electrical engineering   physics   homogenisation   controllability   Maxwell equations   frequency   time   electromagnetic complex media   electromagnetic waves   applied mathematics   electrical engineering   physics   homogenisation   controllability   Maxwell equations   frequency   time  

ISBN: (数字)9781400842650 ISBN: (纸本)9780691142173

摘要： Electromagnetic complex media are artificial materials that affect the propagation of electromagnetic waves in surprising ways not usually seen in nature. Because of their wide range of important applications, these materials have been intensely studied over the past twenty-five years, mainly from the perspectives of physics and engineering. But a body of rigorous mathematical theory has also gradually developed, and this is the first book to present that theory. Designed for researchers and advanced graduate students in applied mathematics, electrical engineering, and physics, this book introduces the electromagnetics of complex media through a systematic, state-of-the-art account of their mathematical theory. The book combines the study of well posedness, homogenisation, and controllability of Maxwell equations complemented with constitutive relations describing complex media. The book treats deterministic and stochastic problems both in the frequency and time domains. It also covers computational aspects and scattering problems, among other important topics. Detailed appendices make the book self-contained in terms of mathematical prerequisites, and accessible to engineers and physicists as well as mathematicians.

关键词： 电磁学   波导缝隙天线   偶极子阵列   辐射远场方向图   仿真  

摘要： 提出一种新的矩形波导缝隙天线远场分析模型。与传统的Elliot波导缝隙天线设计不同,通过对矩形波导缝隙表面电流的合理假设得到缝隙阻抗,将缝隙天线看作偶极子的连续阵来仿真分析,求得远场方向图。将结果与Elliot波导缝隙天线模型的仿真结果进行了比较,证明了该方法的正确性与有效性。

关键词： 电磁学   二十四小时   2D   Flash   电脑辅助教学   电机专业课程辅助  

摘要： 本文研究电磁学相关考题的相关教材,研发完成了一套易懂及具有白话文说明的基本电磁学相关考题电脑辅助教学系统,并且更一步发展成电机专业课程辅助教材。

关键词： 相量变换   正弦交流电路   相量法  

摘要： 正弦量信号表示为相量的实质是一种时域到复频域的变换关系,但各种教科书及文献并没有对这种变换关系进行严格的定义,因而在应用中缺少相应的理论支持。本文提出了一种正弦量与相量的数学变换方法即相量变换,运用严格的数学表达式表示了这种变换关系,并应用实例证明了这种变换关系的正确性和便利性,具有较大的推广价值。

关键词： 图象问题   教学   命题立意   电场强度   电势能   电磁学   静电场   电场力  

摘要： 为了更快、更易、更准地解决φ-x图象问题,在此引入电磁学中的简易结论E=-（dφ）/（dx）、φ=q/（4πε_or）=（kq）/r,突破φ-x图象问题难点.1φ-x图象问题命题立意（1）φ-x图象本身也是历年高考考查的重点、难点.（2）考查静电场中电场强度E、电势φ、电势能。

关键词： 知识地图   网络课程   知识管理   电磁学  

摘要： 目前在网络课程建设方面,普遍存在着课程资源组织线性模块化、导航功能不强、隐性知识共享缺乏等问题,导致网络课程平台利用率低、学习者不能持续学习等现象。而知识地图具有知识导航、知识交流和共享等特点,可以有效解决网络课程建设中的知识组织与呈现。本文探讨了知识地图在网络课程知识管理中的应用,并以高中物理电磁学内容为例,详细探讨了课程知识的呈现与导航的应用方法。

关键词： 变更   共模   补偿   概念   条件   连接件   控制   定义(术语)   测定   失真   传动系统   效应   电力变换器   电动机   电气的   电气工程   电传动系统   电磁的   电磁兼容性   电磁试验   电磁学   电磁兼容性(EMC)   环境   评定   滤色法   波动   频率   格栅   指导手册   工业的   工业区   信息   干扰等级   干扰抑制   干扰   干扰辐射   中断   入侵   极限(数学)   负荷   低频   低电压   磁场   数学计算   测量条件   测量设备   测量技术   最低要求   标准操作   观察   操作   操作位置   概述   性能   工作性能   动力驱动   动力传动系统   规程   产品标准   保护措施   公共的   辐射   住宅区   共振   转速控制   旋转速度   安全性   安全性工程   安全要求   选择   半导体功率转换器   短期   信号传输   规范(验收)   统计学   应力   供应系统   系统   试验   无线电发射机   变异性   验证   振动   能见度   电压降   电压降落  

标准号: IEC 61800-3 Edition 2.1-2012

关键词： 电磁学实验   数据处理   SPSS  

摘要： 以电磁学实验的典型实验为例,考察SPSS在电磁学实验数据应用的可行性。结果表明,在电磁学实验数据处理中引入SPSS,可以提高电磁学实验数据处理及绘图的准确度和效率。