一类比例延迟Volterra积分微分方程的配置法

研究数值求解一类比例延迟Volterra积分微分方程(DVIDE)的配置法. 讨论了配置法的收敛性和整体超收敛性, 并在一种弱假设条件下给出了配置法的局部超收敛性. 数值实验验证了理论结果的正确性.     

积分方程快速小波迭代Galerkin方法的实现

给出了求解第二类积分方程的快速小波迭代Galerkin方法的数值实现及其超收敛性的数值验证,并相应给出一种特殊形式弱奇异积分的数值计算方法,最后给出两个分别具有弱奇异核和光滑核的数值算例,用数值结果验证了快速小波迭代Galerkin方法的超收敛性.     

求解随机二阶锥线性互补问题的一种光滑化SAA方法

研究了随机二阶锥线性互补问题的收敛性问题并基于收敛性分析进行了数值实验.文章利用Chen-Harker-Kanzow-Smale(CHKS)光滑函数和SAA方法,提出了求解随机二阶锥线性互补问题的光滑化SAA方法.基于P性质,建立了收敛性分析,然后通过数值实验验证了算法的有效性.     

一种大规模优化问题的邻近随机L-BFGS方法

本文针对一类机器学习中的大规模优化问题,在凸非光滑的假设条件下,提出了一种新的邻近随机L-BFGS方法,它具有很好的扩展性和鲁棒性。文中分析了该数值方法的线性收敛性,并给出了数值算例,数值算例检验了算法的有效性和收敛性。     

一类含二阶导数的数值公式

本文提出了一类含二阶导数的适合于求解刚性常微分方程初值问题手数值公式，讨论了这类公式的收敛性和稳定性，得到了相应的收敛性及稳定性定理，并构造了一个单步三阶Ｌ的数值公式和一个两步四阶Ａ稳定的数值公式。     

泛函微分方程数值解的混合算法

术文研究泛函数微分方程数值解的混合算法,给出了收敛性定理及数值例子。     

一种选取线性不适定问题正则化参数的迭代算法

考虑利用Tikhonov正则化方法求解线性不适定问题。基于吸收Morozov相容性原理,提出了一种新的选取正则化参数的迭代算法。该算法简单易实现且具有全局收敛性。给出了算法的收敛性分析,并通过数值算例说明了其数值有效性。     

粒子群优化算法收敛性分析

对粒子群优化算法的收敛性进行了分析,给出了收敛条件,数值试验计算验证了收敛性分析结果。讨论了粒子群优化算法参数选取的基本原则。     

一种充分下降的共轭梯度法及其收敛性

基于经典的共轭梯度法,提出一类具有充分下降性的共轭梯度法,并给出了该算法在弱Wolfe步长搜索下的全局收敛性.最后,进行了数值实验,数值效果和算法的全局收敛性表明该算法是有效的.     

一类偏微分方程初边值问题的数值解法

应用有限差分公式给出了一类偏微分方程初边值问题的求解方法,以双曲型方程为例分析了数值解法的收敛性,并且程序实现.计算结果表明,在满足网比r=(r)/k≤1时,问题数值结果收敛性好,精度高.     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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