谈"楞次定律"的教学

“楞次定律”是《电磁感应》这一章教学的重点和难点。为了帮助学生理解楞次定律和应用楞次定律在解题过程中避免常犯的错误，笔者在教学中采取了以下几点做法。     

如何理解楞次定律中“阻碍”的含义

楞次定律的内容：感应电流具有这样的方向，即感应电流的磁场总是要阻碍引起感应电流的磁通量的变化．“阻碍”的含义主要有：1)它“阻碍”的是引起感应电流的磁通量的变化，与该磁通量原来的大小没有关系；2)“阻碍”不是“阻止”，它不能改变磁通量变化的趋势，仅起到一种延缓作用；3)“阻碍”不等于“相反”，当磁通     

楞次定律的理解和应用

18 2 0年丹麦物理学家奥斯特发现电流能产生磁场 .既然电流能产生磁场 ,那么 ,磁场能不能产生电流呢 ?英国科学家法拉第于1 831年作出了历史性的回答 ,“磁能生电” .且证明了线圈中感应电动势的大小与线圈中磁通的变化率成正比 .接下来在 1 834年俄国物理学家楞次发现了确定感     

课后习题作用新探

中专物理教师应挖掘并充分利用教材中有限的物理习题,让它们发挥应有的作用.以下是工科各类专业通用《物理》(下册)P_(110)的一个习题,仅以它在教学中的作用加以说明. 11-1-2如图1所示,闭合线框ABCD的平面跟磁感线方向平行.试问下列情况线框中有无感应电流?方向怎样?为什么? (1) 线框沿磁感线方向移动; (2) 线框垂直于磁感线方向移动; (3) 线框以BC边为轴由前向上转动;     

充分发挥教材的作用

教材是一种静态知识信息的集合 .经典物理教材的系统性、编排、语言组织等都经过千锤百炼 ,是实现教学目标的重要工具 .在中专物理内容多、课时少的情况下 ,要达到好的教学效果 ,必须要求教与学紧扣教材 ,充分发挥其作用 ,对此我作了以下尝试 .1　利用教材目录 ,明确知识结构物     

中专物理的习题教学

习题教学的作用不仅在于巩固和深化所学知识,更重要的是通过对具体问题的分析、研究、计算和讨论,发展学生的智力和思维,培养他们综合分析问题和灵活处理问题的能力.在教学中,要使学生明确解题不在于多,而在于精,通过解题要能做到举一反三,触类旁通.这就涉及到教师在平时的习题教学中如何正确训练学生,使他们真正能够达到这一要求.笔者认为应该着重从以下几个方面加强对学生解题思维方法的训练.     

重构教材资源 彰显实验内涵

: 随着基础教育改革的进一步深入, 越来越需要教师关注教材的二次开发, 依据教育教学的规律和学生 的特点, 重构教材资源, 提高课堂教学的有效性. 文章分析了高中物理教材中“ 楞次定律”的处理方式, 及其在实际 教学中的缺陷, 并且以课堂实录的形式, 展现重构教材资源、 彰显实验内涵的教学设计, 突破教学难点, 实现课堂高 效的飞跃.     

推荐一本有特色的物理教材——易溥藤,窦德海编著的《电磁学》

推荐一本有特色的物理教材———易溥藤、窦德海编著的《电磁学》韩绍先李子元区镜添（南开大学物理系，天津３０００７１）近十几年来，随着教学改革的深入开展，国内陆续出版了多种不同层次的电磁学教材，涌现出一批具有鲜明特色的优秀之作，易溥藤和窦德海两位先生编著...     

Some Generalized Scalar Field Models with Abundant Soliton-Like configurations

Some generahed scalar field models are presented. It is shown that there exist generally three types of soliton solutions for the extended models. The form of the first type of the soliton solutions is model-independent. An arbitrary constant can be included in the second type of the soliton excitations which is model-dependent. The third type of the soliton solutions is also modeldependent but with no arbitrary constant. The extended φ⁴ model and sine-Gordon model are studied in detail.     

Mass Spectrum of Naturally Abundant Ethyldigermane

A complete mass spectral fragmentation pattern of naturally abundant ethyldigermane is presented. The base peak occurs at m/e 148 in the Ge₂H_×=0←5 ⁺ region and not in the parent region. Three metastable peaks are observed at m/e 52.70, m/e 59.36, and m/e 125.63 respectively.     

Mass Spectrum of Naturally Abundant Trigermane

A Complete mass spectral fragmentation pattern of naturally abundant trigermane is presented. The base peak lies at m/e 148 in the Ge₂H_{x =0 → 6} ⁺ region unlike the m/e 222 peak in the parent region of monoisotopic trigermane.¹     

Mass Spectrum of Naturally Abundant Tetragermane

A complete mass spectral fragmentation pattern of naturally abundant tetragermane is presented. The mass spectrum shows a fragmentation pattern of the four different types of ions with the following relative order of intensities: M₂ > M₃ > M₄ > M₁. The base peak lies at m/e 148 in the Ge₂H_x ⁺=0→6 region and not in the parent region.     

用Authorware制作习题课件的技巧

针对物理学的特点,在新的内容学习完后,总要给学生一个巩固练习的机会.若学生能够知道所作习题是否正确,就可大大提高学习的效率,并且可以减轻老师的重复劳动.练习的题型通常是选择题、填空题、计算题等,这些都可以用Authorware制成课件来实现.下面以选择题为例说明用Authorware制作的练习测试课件.     

Abundant multisoliton structures of the Konopelchenko-Dubrovsky equation

Using the homogenous balance method, the nonlinear transformations of the (2+1)-dimensional integrable Konopelchenko-Dubrovsky equation are given, and then some new special types of single solitary wave solution and the multisoliton solutions are constructed. The project is supported by the Natural Science Foundation of Shandong Province in China and the Natural Science Foundation of Liaocheng University.     

mKdV-sine-Gordon方程丰富的相互作用解

基于mKdV-sine-Gordon方程的Wronsk解的形式和结构,提出了Wronsk形式展开法,通过这一方法求得了该方程的丰富的相互作用解,该方法的主要特征是不要求Wronsk行列式元素满足线性偏微分方程组。     

Abundant Multisoliton Structures of the Generalized Nizhnik-Novikov-Veselov Equation

Using the extended homogenous balance method, we obtainabundant exact solution structures ofa (2 1)dimensional integrable model, the generalized Nizhnik-Novikov-Veselov equation. By means of the leading order termanalysis, the nonlinear transformations of generalized Nizhnik-Novikov-Veselov equation are given first, and then somespecial types of single solitary wave solution and the multisoliton solutions are constructed.     

Abundant Multisoliton Structures of the Generalized Nizhnik-Novikov-Veselov Equation

Using the extended homogenous balance method, we obtain abundant exact solution structures of a (2+1)-dimensional integrable model, the generalized Nizhnik-Novikov-Veselov equation. By means of the leading order term analysis, the nonlinear transformations of generalized Nizhnik-Novikov-Veselov equation are given first, and then some special types of single solitary wave solution and the multisoliton solutions are constructed.     

Mass Spectrum of Naturally Abundant Pentagermane and Hexagermane

A complete mass spectral fragmentation pattern of naturally abundant pentagermane is presented together with the parent mass spectrum of hexagermane. The mass spectrum of pentagermane shows a fragmentation pattern of the five different types of ions with the following relative order of intensities: M₃ > M₄ > M₂ > M₅ > M₁. The base peak of pentagermane lies at m/e 222 in the Ge₃H_x=0→8 ⁺ region and not in the parent region. The base peak of hexagermane in the parent region lies at m/e 440. The precise centers of the three metastable regions of pentagermane lie at m/e 95.51, m/e 165.55 and m/e 237.47 respectively.