第二类Fredholm积分方程的多项式多投影算法

主要讨论第二类Fredholm积分方程的多项式多投影算法.算法应用到Galerkin方法和配置法两种情况,并证明当核函数和方程的解具有一定的光滑核性时,多投影算法的近似解及其迭代解的精度分别是一般有限维投影法近似解的三倍和四倍,表现出算法具有非常高的超收敛性.     

具有超收敛性的积分方程的快速泛函逼近方法

主要构造第二类Fredholm积分方程的线性泛函解的具有超收敛性及高效率的快速泛函逼近框架,同时应用到小波Galerkin情形,构造快速多尺度Galerkin泛函逼近框架,并给出近似解的误差估计.     

基于LS-SVM的第二类Fredholm积分方程的数值解

【目的】提出一种基于最小二乘支持向量机求解第二类Fredholm积分方程的数值算法，并利用该方法对第二类Fredholm积分方程进行数值求解。【方法】具体过程主要由4部分组成：首先将积分区间等分得到训练点，其次构造未知函数的近似解析式，然后利用复化Simpson求积分公式将问题转化为二次规划问题，最后求解回归参数。【结果】在给定参数条件下，证明了解的唯一性；通过数值算例验证了算法的有效性。【结论】提出的方法用于解第二类Fredholm积分方程是可行的。     

非线性分数阶Fredholm积分方程的B样条小波解法

利用B样条小波函数数值求解非线性分数阶第2类Fredholm积分方程,将具有紧支集的线性半正交B样条尺度函数和小波函数一起应用于数值求解非线性分数阶第2类Fredholm积分方程中.这种方法将非线性分数阶Fredholm积分方程转化为非线性代数方程组,再通过数值求解方程组得到原方程的数值解, 证明了误差边界值,数值算例验证了本方法的有效性和准确性.     

第二类Fredholm积分方程的数值解法

首先介绍了第二类Fredholm积分方程,然后设计求解第二类Fredhlom积分方程的数值格式,即利用Simpson公式或Gauss型求积公式进行数值积分,寻找近似解■(x).算例结果表明,该数值解法具有高精度性质.     

基于有理Haar小波求解分数阶第2类Fredholm积分方程

利用有理Haar小波函数数值求解分数阶第2类Fredholm积分方程,用有理Haar小波定义及性质与配置法给出有理Haar小波积分算子矩阵,将积分方程转化为代数方程组进行求解.最后通过误差分析和数值算例将分数阶积分方程的精确解和用Haar小波所得数值解进行比较,表明了该算法具有较高的精确度.     

变积分限Cauchy核与卷积核混合的完全奇异积分方程的求解

考虑{0}函数类中, 变积分限的Cauchy核与卷积核混合的完全奇异积分方程的求解问题, 借助Fourier积分变换, 利用Riemann边值问题和Fredholm积分方程理论, 先将所讨论的方程转化为在一定可解条件下与其等价的{{0}}类中的Fredholm积分方程, 再通过求解等价的Fredholm积分方程, 得到所研究方程在{0}函数类中的可解条
件及一般解.     

有理化Haar小波解第二类Fredholm积分方程

为了解第二类Fredholm积分方程,建立了一种使用有理化Haar小波解第二类Fredholm积分方程的算法。其中,将积分方程转化为线性方程组求解。数值结果证明这种方法是非常有效的,具有较高的精确度。     

积分方程的Legendre多小波自适应解法

由多分辨分析理论,构造了L(2[0,1])上的分段Legendre多小波基函数,并利用所构造的基函数提出了求解积分方程的配点法.求解过程中,对小波系数用阈值进行筛选,利用分段Legendre多小波基函数求解.以第一类Fredholm积分方程为例,表明该算法简单有效.     

核属于H函数类的Fredholm积分方程类近似解的计算复杂性

本文给出了Lp[-π，π](2≤p≤∞)范意义下，核属于H函数类的第二类Fredholm积分方程近似解的ε-计算复杂性．     

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