对一个电磁感应佯谬的诠释

利用超导经典电磁理论．诠释了一个电磁感应佯谬，其结果在超导体的应用3-面有一定的实际意义。     

衍射理论中的佯谬

介绍衍射理论的历史发展，分析衍射理论中佯谬产生的根本原因，以及佯谬的解决对物理学衍射理论发展所起的作用．     

磁场及磁性元件间力特性研究

依据实验中电磁，永磁两种元件同极间的力学现象，提出了关于磁力线性质的三个假说，认为磁力线具有线间斥性，最小阻径性和磁力线通过铁磁质时的容限性，并应用上述三个假说和相关的电磁理论，对实验中的力学现象进行了解释。     

平面电磁波在高空电离层中的传播

通过对等离子体电磁性质的讨论，研究平面电磁波在高空电离层中的传播，并对平面电磁波在电离层中的反射和的射现象做出了简单描述。     

电磁诱导透明现象的研究进展

综述了近年来著名的电磁诱导透明(EIT)现象的研究进展,对这一现象的物理机制进行尝试性探讨;并对电磁诱导透明现象与强电磁场作用下的动态Stark分裂现象进行了比较.结果表明,上述2种现象的物理机制具有微妙差别.     

狭义相对论佯谬另解

爱因斯坦狭义相对论从1905年创立到现在有一百多年历史，它使物理学发生了重大飞跃。，并被许多实验所证实。然而它有个不尽之处就是佯谬绳结。此问题可以在广义相对论中有加速度或有引力场情形下得到解决。但是物质周围并不是都存在着加速或引力，在无加速、无引力和加速微弱、引力忽略不计的系统r喷性系）即狭义相对论定义范围的前提下，一些文章对佯谬进行了解答，虽有其合理性．但不够完善。对某些特殊的情形．还无法解答，佯谬问题依然存在。本人另寻别径，利用等价原理代替相对性原理来解决这个问题，不仅完整解决了佯谬，还拓宽了该理论．扩展了的理论还可解释近期报道的中微子超光速现象。     

输运现象中的“2■”佯谬

《热学》教材中[1]，平均自由程定义为分子在连续两次碰撞之间通过的自由路程的平均值。而在从微观角度推导输运过程的宏观规律时，只有近似认为分子穿过ds面前最后一次受碰处距ds的平均距离为，也就是说认为穿过ds面的分子平均无碰撞地通过了的路程，才能得到与实验现象相符的结论。这似乎与平均自由程的定义产生矛盾，导致了所谓的佯谬，佯谬是《热学》教学中的一个难点[2]。我们认为：佯谬的产生是由于对研究问题的实质产生混淆而引起的，全体分子的平均自由程是，而无碰撞地通过某一固定平面的分子的平均自由程应是。下面我们将从定性和…     

讨论费曼园盘佯谬时疏忽的一个问题

有的文献在讨论费曼园盘佯谬时,得到园盘所获机械角动量是由电磁角动量转化而来的结论欠妥.本文通过定量计算,给出正确答案,并指出在讨论电磁体系角动量时,经常疏忽的一个问题.     

电磁体系角动量守恒的完整物理图像——从对条件改变后的费曼园盘佯谬谈起

本文借助矢量分析工具,针对费曼园盘佯谬中,园盘边缘的带电小球改放在线圈内部的情形,解决了发散困难,在定量计算的基础上,对电磁体系角动量守恒做全面讨论,给出完整的物理图像.     

关于电磁作用与弱作用的统一理论

近年来电磁作用与弱作用的统一理论颇受到理论物理界的注意,因为它一方面是使现有弱作用理论摆脱困境向前发展的一种尝试。另一方面,它既抓住了弱作用与电磁作用现象的共同点,也解释了两种作用的差异。指出就象过去曾被认为是无关的电和磁,实际上是统一的电磁现象在不同条件下的表现。同样,电磁作用和弱作用也很可能是某一种统一的作用的不同表现。     

Markedness and its Interpretation in Language Use

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

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。     

On Tragic Consciousness In The Works By Ernest Hemingway

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.     

Achieving Unusual States of Matter Under High Pressure

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-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

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     

Call for Papers

<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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~