自由旋转链模型几何法均方末端距公式的概率推导

本文用概率方法给出高分子物理学中自由旋转链模型的均方末端距公式一个严格推导。     

光的双缝干涉中公式△x=d/lλ的推导及应用

光的干涉是高中物理学中光的波动性的重要内容。现行教材物理第三册（人民教育出版社物理室编著）第24页提出,在l远大于d的前提下,让同学们自己推导,在这里,就平时的物理教学谈谈对公式△x=d/lλ的推导及应用。     

光的双缝干涉中公式Δx =(l)/(d)λ的推导及应用

光的干涉是高中物理学中光的波动性的重要内容.现行教材物理第三册(人民教育出版社物理室编著)第24页提出,在l远大于d的前提下,让同学们自己推导,在这里,就平时的物理教学谈谈对公式△x =(l)/(d)λ的推导及应用.     

物理教学中几个问题的探讨

对物理教学中压强公式的推导、用普朗克假设解释黑体辐射规律两个问题,提出不同于各种教材的处理方法。同时对我校现用教材、南京工学院等七所工科院校编,马文蔚、柯景凤改编的《物理学》中第八章“热力学基础”内的一道习题的错误解法进行了更正。     

如何求解平面简谐波的波动方程

众所周知,物理学中通常要研究的一些非常复杂波动形式,而这些复杂的波动形式通常可以视为是由平面简谐波的叠加形成的,因此,平面简谐波的研究就尤为重要,本文从另外一种角度推导出了具有一般形式的平面简谐波的波动方程,利用此公式求解波动方程简单而且准确.     

元素电势图Luther—Wilson公式的简易推导

元素电势图 Luther—Wilson 公式在无机化学的教学中,特别是研究元素的氧化—还原性质是十分有用的公式。已有报导介绍了一种推导方法。若利用物理学中电场力对电荷作功的概念,可以得到更为简单的推导方法。氧化—还原作用一般视为两个电极反应。若考虑还原态作电极反应:     

一类重要极限公式的多种导出法

在微积分中,重要极限可以为其它极限的计算甚至许多定理、公式的推导提供方便,从而我们有必要对重要极限公式的导出详加考察,以加深对公式的理解和应用。本文讨论重要极限公式lim(x→0)sinx/x=1的推导法,分别利用夹逼准则、洛必达法则、泰勒公式、等价无穷小量代换等方法,获得了该公式,并利用这个重要公式求解一些极限问题。     

从经典物理推导爱因斯坦质能方程

为找到一条由经典物理学通往狭义相对论的道路,根据相对性原理,洛伦兹力公式在不同惯性系中应具有相同的数学形式,从经典物理学推导出爱因斯坦质能方程。     

关于麦克斯韦速率分布律的教学探讨

从教学角度针对非物理学专业学生学习大学物理学的特点,利用归一化条件和温度公式,并借助初等微积分知识推导出了麦克斯韦速率分布律,从而加深对温度公式和分布律的统计规律性的理解.     

关于Fresnel公式的一些问题

Fresnel 公式在 Maxwell 电磁理论之前就已经用其他方法获得并由实验所证实了。根据 Maxwell 方程和相应的边值推导出 Fresnel 公式无疑是 Maxwell 电磁理论的一个重要成果。但是在一般的电动力学书中,根据 Maxwell 方程以及相应的边值关系推导 Fresnel 公式时,有一些前提没有说清楚,致使造成一些混乱和误解。我们认为一般电动力学书中,推导 Fresnel 公式有两个问题没有说清楚,一是不少电动力学书中先假定对一定频率的一个反射平面电磁波只有一个平面反射波和平面折射波。关于这     

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~~