用电磁理论确定朗伯吸收系数

朗伯吸收是分子光学中对光的吸收现象的经典解释 .作者用电磁理论对光的吸收现象进行讨论 ,确定朗伯吸收系数的数学形式。     

ANALYSIS OF THE FIELDS SCATTERED FROM A TWO－DIMENSIONAL CYLINDER ILLUMINATED BY A POINT SOURCE

ＡＮＡＬＹＳＩＳＯＦＴＨＥＦＩＥＬＤＳＳＣＡＴＴＥＲＥＤＦＲＯＭＡＴＷＯ－ＤＩＭＥＮＳＩＯＮＡＬＣＹＬＩＮＤＥＲＩＬＬＵＭＩＮＡＴＥＤＢＹＡＰＯＩＮＴＳＯＵＲＣＥＣｈｅｎｇＣｈｏｎｇｈｕ（程崇虎）ＺｈａｎｇＷｅｎｘｕｎ（章文勋）（ＳｔａｔｅＫｅｙＬａ...     

微波电磁场理论与周期结构

回顾了微波电磁场理论产生和形成的历史,介绍了微波电磁场理论的一个重要分支——周期结构研究近年的最新成果和作者的部分工作.     

导电高分子材料在电磁屏蔽的效能分析

导电高分子材料在电磁屏蔽领域有着广阔的应用前景．按结构及制备方法不同，可将导电高分子材料分为本征型与复合型两大类．导电填料高分子基体和复合工艺是影响导电高分子材料电磁效能的重要因素．     

Effects of physical models and simulations to understand daily life applications of electromagnetic induction

Background: One of the topics students have difficulties in understanding is electromagnetic induction. Active learning methods instead of traditional learning method may be able to help facilitate students’ understanding such topics more effectively.

Purpose: The study investigated the effectiveness of physical models and simulations on students’ understanding daily life applications of electromagnetic induction.

Sample: The nine participants in the study were voluntaries from the fourth year of the physics education undergraduate programme.

Design and methods: Lessons were designed to enhance students’ conceptual understanding of electromagnetic induction. Researchers developed multiple generator and simple electric motor models. These models and simulations about Faraday’s Law, magnetic field, magnets, generator and radio waves were used in lessons. The data were collected through open-ended questionnaire and semi-structured interview. Open-ended questionnaire was employed in a pre-test and a post-test. Students’ answers were categorized as sound understanding, partial understanding, misunderstanding and no understanding. At the end of the last lesson, the interview was implemented about the students’ opinions related to application.

Results: For each question, the number of responses matching the accepted scientific explanation increased after application. The number of illogical or incorrect responses decreased.

Conclusions: Physical models and simulations used in the present study had positive effect on students participated in this study to understand electromagnetic induction and its daily life applications.     

带电粒子在均匀恒定正交电磁场中的运动

根据运动方程 ,讨论带电粒子在均匀恒定正交电磁场中的运动 ,并通过简明的物理分析 ,理解粒子的运动规律及其轨迹的形成     

感应加热原理的讨论

感应加热具有热效率高、无污染、无明火的特点，家用电器应用感应加热技术，将会改变传统的厨房电器．从感应加热原理的分析入手，讨论其在家用电器产品中的应用．     

控制动态电磁感应强度的神经网络逆向建模方法

介绍了基于B-H磁滞回线,利用BP人工神经网络建立的逆向B-H模型。根据建立的这个模型,利用simulink对这个模型进行仿真,通过输入期望的磁感强度信号,得到需要的磁场强度信号。     

一种新型金属化空心微球电磁功能材料

介绍了一种新型电磁功能材料．该材料由表面无电子镀镍的空心微球组成．采用扫瞄电镜观测了镀镍前后的表面微观结构，制备成样品放入X波段波导框中，在微波网络分析仪上进行散射参数测量，计算了电磁特性参数．结果表明，该材料在表面镀镍后取得了较高的磁导率(19．0)和磁损耗正切(0．6)，而介电常数保持较低(1．8)．与非金属化微球材料相比，可作为超薄型多层微波吸收材料的基本材料．     

冲击负荷下汽轮发电机端部绕组电动力及其振动问题的研究(Ⅰ):端部绕组电动力分析

本给出了冲击负荷下发电机端部三维瞬态涡流场的边值问题，并阐述了求解该问题时在空间，时间上的离散方法，在综合考虑计算精度和计算稳定性两方面因素的基础上，运用Crank-Nicolson方法得到了时间 差分的迭代格式，在此基础上，详细分析了冲击负荷下汽轮发电机的部电磁场，本的研究为进一步分析发电机端部绕组电动力及电磁振是供了依据。