高维代数簇的算术

求解不定方程是数学最古老的问题之一。从勾股方程到20世纪才证明的费马大定理都是典型的例子。为纪念希腊数学家丢番图，西方将不定方程称为丢番图方程。与通常的确定方程不同，丢番图方程没有统一的理论和解法。近年来许多高深的数学理论与方法的引人使这个领域获得飞速的发展，     

一般二元二次丢番图方程的解法

给出了若干个关于二元二次丢番图方程 ax2 bxy cy2 dx ey f=0整数解的定理 ,系统地解决了二元二次丢番图方程的求解问题     

一类丢番图方程的全部正整数解

丢番图方程是数论的一个古老分支,有大量关于丢番图方程的研究结论。二次丢番图方程的全部正整数解问题已经被解决,但是对于指数型丢番图方程全部正整数问题现在依然是一个难题,文中运用二次丢番图方程正整数解的一些性质得到了一类指数型丢番图方程■的全部正整数解。     

丢番图方程x3+1=8y2的整数求解

为了研究丢番图方程x^3＋1=Dy^2（D〉0）的求解问题,利用唯一分解定理,证明了丢番图方程x^3＋1=8y^2仅有整数解（x,y）=（-1,0）,（23,±39）,丢番图方程x^3＋1=72y^2仅有整数解（x,y）=（-1,0）,（23,±13）,丢番图方程x^3＋1=1352y^2仅有整数解是（x,y）=（-1,0）,（23,±3）,丢番图方程x^3＋1=12168y^2仅有整数解（x,y）=（-1,0）,（23,±1）,并归纳得出了形如x^3＋1=8k^2y^2的丢番图方程的解的形式。     

一个整数环Z上的可换的结合代数及一类丢番图方程

丢番图(Diophantus)方程是一个古老的课题,但由于许多数学问题都可归结到特定的丢番图方程的整数解问题,而整个地说,高次多元丢番图方程只有少数特例被搞清,还有许多工作要做;并且求解丢番图方程又可促进新的数学工具的出现,因此,至今丢番图方程的研究仍很活跃.     

谈谈丢番图方程x~2+y~2=z~2

本文讨论了丢番图方程（1）的本原解的公式，介绍了费与（Fermat）无穷递降法，证明了丢番图方程x4±4y4=z2，x4+y2=z4无xyz≠0的解，并讨论了几个特殊的丢番图方程的解。     

关于丢番图方程x5-x3=Dy3

该文利用初等数论方法及丢番图方程理论，获得了丢番图方程x^5-x^3=Dy^3有正整数解的充要条件及其深刻结果。     

关于丢番图方程x±1=3Dy_1~2,x~2■x+1=3y_2~2

本文用初等方法研究了丢番图方程x±1=3Dy_1~2,x~2x+1=3y_2~2,得到了定理1和定理2。     

关于单位分数的丢番图方程

给出了某些单位分数丢番图方程的一般解，并给出了丢番图方程∑１／ｘｉ＝ａ／ｂ，（ａ，）＝１存在整数解的一个充要条件。     

关于Zm的尾数问题

引入尾数的定义，讨论Z^m的尾数问题，得到几个关于尾数的定理．这对研究整数的整除性、整数运算结果的检验及丢番图方程的求解具有一定的参考价值．     

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~~