模拟退火法用于电压稳定分析

为了提高用于电压稳定分析的非线性最优化方法的效率,提出了将模拟退火法和单纯形法相结合求解非线性最优化问题的新算法,避免了在全局最优点附近的大量低效搜索,提高了模拟退火法的计算效率。应用这种新算法求解静态电压稳定极限,用５节点系统进行验证得到了满意的结果。求解静态电压稳定极限问题可以等效为含有非线性等式约束和不等式约束的非线性最优化问题,采用内点法将不等式约束问题转化为等式约束问题,再通过引入罚函数转化为无约束最优化问题,然后应用本算法进行计算,结果表明新算法是有效的。     

基于粒子群优化算法的分散式废水处理网络的综合

基于分散式废水处理网络的超结构，建立了废水处理网络系统最优化的非线性规划模型和混合整数非线性规划模型．它们是具有非凸性的复杂非线性数学规划问题，用现有的方法进行求解不能保证得到全局最优解．因此，提出了应用新型随机型算法——粒子群优化算法求解上述复杂非线性最优化问题．算例问题的求解计算表明，提出的废水处理网络粒子群优化方法具有不要求初始可行点以及适应全局优化等优点，能够快速有效地解决废水处理网络最优化问题．     

量子粒子群算法求解整数规划的方法

粒子群算法主要用于优化连续性问题。如果用于求解整数规划问题,算法的粒子位置必须解决取整问题;而量子粒子群算法求解整数规划问题具有更高的效率。利用三种取整方法与量子粒子群算法结合,求解非线性整数规划问题,并且与标准粒子群算法求解整数规划问题进行比较。通过对基准函数仿真实验,比较了六种方法求解整数规划问题。实验结果表明,基于随机取整的量子粒子群算法搜索成功率优于其他五种方法,其综合搜索效率更佳。寻找了一种更优的求解整数规划方法。     

数学建模中优化模型的求解方法

介绍了运用MATLAB的优化工具箱来求解无约束最优化问题、线性规划优化问题、有约束非线性最优化问题及二次型规划问题的具体命令及其使用格式;还介绍了对比较复杂的优化模型,可以运用的最优化算法:神经网络算法、遗传算法、模拟退火算法、支持向量机和粒子群算法,该文给出了各个算法的运用思路或者具体步骤,方便读者参考引用。     

基于粒子群算法的整数规划问题的求解算法

整数规划是运筹学的一个分支,一直以来没有很好的求解算法.目前有研究人员尝试用粒子群算法求解整数规划,但都只能解决无约束整数规划问题.提出了一种求解约束整数规划的粒子群算法,能够解决有约束线性和非线性整数规划问题.     

非线性规划问题全局优化的模拟退火法

在无约束非线性规划问题全局优化的模拟退火算法基础上，进行有约束问题求解的进一步探讨，对不等式约束条件提出了检验法和罚函数法的处理方法，对等式约束条件开发了罚函数法和解方程法的求解步骤，并进行了分析比较，从而形成了完整的求取非线性规划问题全局优化的模拟退火算法。通过对文献例题的计算，表明所提出的方法能够快速有效地求出有约束非线性规划问题的全局最优解     

一类非线性规划问题算法研究

针对一类非线性规划问题,将模拟退火算法进行了改进,提出了一种相邻状态的产生函数,为研究非线性规划提供了新的有效求解途径。实例计算表明,该方法求解非线性规划确实有效。     

整数规划模型的Matlab程序实现

整数规划是线性规划的基础上,对部分或全部决策变量为整数的最优化问题的模型、算法及应用等研究,是运筹学和管理科学中应用最基本的模型之一。大多数整数规划问题的计算求解存在实际的困难,求解一般线性规划的方法无法求解整数规划。为加深学生的理解,提高动手能力,本文介绍了一般整数规划和0-1整数规划的Matlab命令,并给出具体的实例。     

几种求解非线性整数规划的局部极小点的算法

求解整数非线性规划问题的局部极小点是求解整数非线性规划问题的全局最优解的前提.很多求解整数非线性规划问题全局最优解辅助函数法(比如填充函数法)都需要先求整数非线性规划问题的局部极小点.给出求解非线性整数规划问题局部极小点的坐标轮换法,并与已有的两种方法作了算例比较.     

梯级水电站排序的整数非线性规划模型与算法

本文运用整数非线性规划方法建立选择梯级水电站最优开发顺序的排序模型,研究了一种适合于求解目标函数和(或)约束函数只具有可计算性的整数非线性规划问题的直接搜索寻优算法。     

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

正~~