波动方程初值问题求解新法

给出了一种化归方法 ,通过适当的手段巧妙地将求解波动方程初值问题化归为传输方程的初值问题或热传导方程的初值问题     

波动方程初值问题求解新法

给出了一种化归方法,通过适当的手段巧妙地将求解波动方程初值问题化归为传输方程的初值问题或热传导方程的初值问题.     

解第一类算子方程的正则化方法

解第一类算子方程的正则化方法杨宏奇（复旦大学数学研究所，２００４３３，上海）第一类算子方程的求解是典型的不适定问题“”’‘’“．这类问题的解法，有不少学者进行过研究，如Ｔｉｋｈｏ。ｖ”‘，Ｍｏｒｏ。ｖ’“，Ｇｒｏｅｔｓｃｈ’‘’，Ｅｎｇｌ“’等曾研究...     

环形Hartmann势的Schr(o)dinger方程束缚态的精确解

将环形Hartmann势的Schrodinger方程在球坐标系中进行变量分离，然后求解角向方程和径向方程，得出了精确的能谱方程，获得了归-化的角向和径向波函数，并给出了Hartmann势的径向矩阵元和径向平均值的通项表示式。     

非线性Schrodinger方程的流不变集

本文采用“非线性化”方法，对非线性Ｓｃｈｒｄｉｎｇｅｒ方程的Ｌａｘ组进行非线性化。非线性化后，Ｌａｘ组空间部分的解析解簇恰好为其时间流ｓ（Ｓ由Ｌａｘ组时间部分决定）的不变集     

由Hamilton-Jacobi方程引申Dirac方程

量子力学与经典力学有着密切的联系,经典力学的Hamilton-Jacobi方程在Schrdinger方程的提出中扮演了重要的角色,在教学中也是引申Schrdinger方程的方法之一;相对论化的Hamilton-Jacobi方程也可以引申出相对论量子力学的Klein-Gordon方程,进一步思考,并分析Klein-Gordon方程和Dirac方程的区别,本文将相对论化的Hamilton-Jacobi方程线性化,引申出了相对论量子力学更基本的Dirac方程,使Hamilton-Jacobi方程作为经典力学通向量子力学的途径更深入一步,进一步揭示了经典力学和量子力学的对应关系.     

三角形的方程

绝对值方程作为折线方程的研究,始于80年代中期,是我国在初等数学研究领域提出的一个新课题.杨之于1986年在中等数学第五期上猜想:“奇数条边的多边形的方程不存在,特别,三角形的方程不存在”.本文给出了三角形方程的一般形式,以及在给定三角形各顶点坐标的情况下,直接写出三角形的方程的方法.从而说明上述猜想是不正确的.     

第一类算子方程的Ritz正则化方法

本文利用Ｒｉｔｚ正则化方法求解第一类算子方程，当算子和右端都近似已知时，给出一个选择正则化参数的方法，并给出正则解的渐近收敛阶估计。     

直流电机的磁通方程和通用特性方程

本文首先提出了“直流电机的磁通方程”,在此方程基础上又导出了“直流电机的通用特性方程”。利用这个通用特性方程,结合每种类型直流电机的特性,即可推导出所有直流电机的许多特性曲线的相应方程,得以解决直流电机的非线性定量化的问题。     

蒸汽压方程的实验研究

本文根据Ｃｌａｕｓｉｕｓ－Ｃｌａｐｅｙｒｉｏｎ方程，提出了一个确定纯净化经潜热的简易实验方法，实验中，通过测定温度和体积，可得到蒸汽压及汽化潜热，结果与经验的Ａｎｔｏｉｎｅ方程和文献中的有关汽化潜热数据相符。     

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

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