共查询到20条相似文献,搜索用时 421 毫秒
1.
从毕奥-萨伐尔定律(文中简称毕-萨定律)出发,直接导出了麦克斯韦方程组,使得人们对于电磁相互作用以及有限速度传播这一物理思想有了更完整地认识。 相似文献
2.
利用各向异性磁介质中毕奥-萨伐尔定律,以及由此定律求出的,在各向异性磁介质中无限长载流直导线的磁场的基础上,进一步求出无限大载流薄板在磁各向异性介质中的任一点的磁场强度,拓展该定律的应用范围. 相似文献
3.
从电磁学的毕奥-萨伐尔定律出发,然后利用矢势描写形式推导静态和非静态的毕奥-萨伐尔定律,并进一步研究推广到一般电磁源存在的情况,然后验证电磁场满足SO(2)电磁对偶性. 相似文献
4.
武晶文 《北京工商大学学报(自然科学版)》1992,(1)
毕奥-沙伐尔(Biot-Savart)定律定量概括了稳恒电流元矢量产生磁场的规律,同时又描绘了稳恒电流磁场的分布特征.因此,毕奥-沙伐尔定律成为稳恒磁场方程的重要理论基础. 相似文献
5.
史友进 《盐城工学院学报(自然科学版)》1999,12(3):37-39
应力-光定律是光弹性实验应力分析的基本理论。从正交异性光弹性的物理机制出发,运用矩阵理论,建立了正交异性光弹性应力-光定律,讨论了正交异性光弹性试验方法。 相似文献
6.
7.
龚伦训 《贵州师范大学学报(自然科学版)》1993,11(3):65-66
<正> 在现行的光学、原子物理学和量子力学的教材中,往往要讲述维恩位移定律:λ_mT=b(常量)。这个定律是由普朗克公式:ε_λ,T=2πhc~2λ~(-5)(e~(he/λkT)-1)~(-1) 相似文献
8.
吴一微 《湖北师范学院学报(自然科学版)》2006,26(2):82-84
比较了不同教材对朗伯-比尔定律(Lambert-Beer Law)的描述,指出了这些描述的不严密性,讨论了它们对教与学带来的困难。通过对朗伯-比尔定律发现及发展的研究,提出了笔者认为较为严谨的论述形式。 相似文献
9.
选取适当的σ-代数,用鞅方法得到行-列可交换随机变量无限和有限组列的强大数定律。特别地,对具有有限方差的无限组列,可以证明其强大数定律成立的充要条件是此组列的对角元素列为不相关的。 相似文献
10.
王较过 《四川师范大学学报(自然科学版)》2001,24(6):614-617
通过论述“用磁针周期振荡法测量磁极受到作用力”的原理,以及建立毕奥-萨伐尔定律的两个典型实验,揭示了建立毕奥-萨伐尔定律的研究方法及物理思想,说明了实验在物理学理论发展中的重要作用。 相似文献
11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
12.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
13.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
14.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
15.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
16.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
17.
Michael Springborg 《华南师范大学学报(自然科学版)》2014,(6):136
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the 相似文献
18.
Zhu Chaoyuan 《华南师范大学学报(自然科学版)》2014,46(6):140-140
Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of 相似文献
19.
《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献