一个改进的求无约束优化问题的BFGS方法

本文对求解无约束优化问题的BFGS方法进行了改进,改进的算法同样具有整体收敛和超线性收敛特性。并对算法进行了数值检验,其数值结果表明,算法的收敛速度比原方法要快。     

求解无约束最优化问题的最速下降法的修正

提出了求解无约束最优化问题的最速下降法的一种修正算法，并给出了算法的收敛性证明。     

求解一类无约束优化的混合遗传算法

目的 求解一类无约束优化问题。方法 结合传统优化算法局部寻优能力强、收敛速度快，而遗传算法在搜索过程中不易陷入局部最优的两种算法的特点，给出了一种基于最速下降法的混合遗传算法。结果 算例表明所设计的算法是有效的。结论 算法可以提高局部搜索能力，提高解的精确度，搜索速度。     

Powell搜索法和惯性权重非线性调整局部收缩微粒群算法的混合算法

提出一种求解无约束最优化问题的新的混合算法Powell搜索法和惯性权重非线性调整局部收缩微粒群算法的混合算法.该算法不需要计算梯度, 容易应用于实际问题中.通过对微粒群算法的修正, 使混合算法具有更加精确和快速的收敛性.首先利用20个基准测试函数进行仿真计算比较, 计算结果表明, 新混合算法在求解质量和收敛速率上都优于其他算法(PSO, GPSO和NM-PSO算法).其次, 将新混合算法和最新的各种协同PSO算法进行分析比较.结果表明, 新混合算法在解的搜索质量、效率和关于初始点的鲁棒性方面都远优于其他算法.     

一个与Powell搜索相结合的混合免疫进化算法

提出一个求解无约束最优化问题的新的混合算法——Powell搜索法和免疫进化算法的混合算法.该算法不需要计算梯度,容易应用于实际问题中.通过对免疫进化算法的修正,使混合算法具有更加精确和快速的收敛性.利用4个基准测试函数进行仿真计算比较,结果表明新混合算法在解的搜索质量、效率和关于初始点的鲁棒性都远优于免疫进化算法,仿真结果表明了新算法是求解无约束最优化问题的一个高效的算法.     

Powell搜索法和惯性权重非线性调整局部收缩微粒

提出一种求解无约束最优化问题的新的混合算法Powell搜索法和惯性权重非线性调整局部收缩微粒群算法的混合算法. 该算法不需要计算梯度, 容易应用于实际问题中. 通过对微粒群算法的修正, 使混合算法具有更加精确和快速的收敛性. 首先利用20个基准测试函数进行仿真计算比较, 计算结果表明, 新混合算法在求解质量和收敛速率上都优于其他算法（PSO, GPSO和NM PSO算法）. 其次, 将新混合算法和最新的各种协同PSO算法进行分析比较. 结果表明, 新混合算法在解的搜索质量、 效率和关于初始点的鲁棒性方面都远优于其他算法.     

一种新的无约束优化方法

提出一种新的无约束优化方法，此方法在确定探索方向时，不需提供导数信息，仅需根据设计点附近“定向单元”的函数信息，便可确定出有效的探索方向，进而较快的获得最优点。本方法算法原理简单，易于编程，经３个例题验证，取得了满意的结果。这说明了此方法的可靠性和正确性，为优化设计领域提供了一种新的优化算法。     

两类无约束优化的充分下降共轭梯度法

对无约束优化问题提出两类新的充分下降共轭梯度法. 在每次迭代过程中, 算法均可得到充分下降方向. 在适当条件下, 证明了算法的全局收敛性. 数值结果表明算法可行、 有效.     

MWWP线搜索下的新共轭梯度法

随着计算机技术的革新和生产生活中大规模无约束优化问题的涌出,为寻求高效快速的方法,本文构造新共轭梯度算法.将一种修正弱Wolfe-Powell线搜索称为MWWP线搜索,使其与具有良好的充分下降性的DPRP共轭梯度法相结合,证明了该算法在新型线搜索下的全局收敛性,并将该算法与传统共轭梯度法进行了数值实验对比,数值实验结果表明了新方法是有效可行的.     

一类混合的FR-PC共轭梯度法及其全局收敛性

提出了一种混合的FR-PC共轭梯度法,该法每步迭代都可自动产生一个充分下降方向.分别在Wolfe搜索和固定步长公式下证明了算法的全局收敛性,数值实验说明算法是有效的.     

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