三类复系数复数方程根的性质定理

本文借助特征方程法给出了三类复系数复数的方程的求根公式，直接应用求根公式求相应方程的根显得格外简捷，文中列举了实例。     

关于方程y″＋py＇＋qy＝Ψm（x）e~（λx）特解的一点注记

给出确定二阶常系数线性非齐次方程特解中多项式系数的公式．     

高维线性大系统的一类特解的探求方法

对一类变系数高维线性大系统引入特征方程和特征根的概念，给出了具有t^ke^λt型特解的有效的探求方法，推广了经典的常系数线性系统和Euler方程的解法．     

求解代数方程的迭代法及其在计算机上的实施

基于Bernoulli求根迭代法,讨论了一元实系数的代数方程的求根问题。提出了一种在计算机上的有效的迭代格式。根据这一理论设计出C语言程序,并且用C Builder和Delphi作界面调用这一程序,设计出求解代数方程的计算器。数值算例表明,该算法不仅有较高的精度,而且收敛速度快。     

沃利斯公式新证明

借助于类比思维,利用根与系数关系类似联想的思维方法及差分方程解的收敛性,给出了沃利斯(Wallis)公式的新证明。旨在借鉴模仿创新思想,利用新视角方法,促进工程数学与实际问题的融合,打通复杂计算的瓶颈,建立快速通道。     

变系数微分方程的常系数化条件

不同于解具有e∫φ(z)dz形式的待定函数法,由引理1给出了n阶变系数微分方程具体的因变量代换形式,从而给出n阶变系数微分方程常系数化的充要条件并加以详细证明,由此得到二阶、三阶变系数线性微分方程常系数化的充要条件,同时指出三阶变系数微分方程在具体应用中令a1=0的简便性.对二阶变系数非线性微分方程的常系数化给出两个使其可积的条件,并举例论证.     

交换代数中实系数二次方程的根

给出了交换代数S中二次方程aX2＋bX＋cIS=0S,a,b,c∈R,a≠0（其中IS,0S分别是交换代数S中的单位元和零元,X∈S）的求根公式和根与系数的关系.     

常系数线性差分系统解的结构

本着重讨论了常系数线性差分系统在系数矩阵特征值有重根时解的结构．     

几类变系数微分方程化为常系数方程的变量代换法

通过变量代换法将几类变系数微分方程化为常系数方程,并给出化为常系数方程所应满足的条件。     

变系数线性方程可求解存在的条件

探讨在某些变换下，变系数线性方程或线性方程组可化为常系数的方程或其他可求积分解方程的条件，得出一些十分有意义的结果。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

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     

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