基于非关键工序组的资源均衡优化方法

对网络计划资源均衡优化中“缩方差法”优化模型进行了分析，针对其调整过程复杂、求解效率低的问题，引入“非关键工序组”的概念，通过对单一工序调整过程的分析，论证了将初始总时差相同的非关键工序视为一个整体进行同步调整的可行性，提出了相应的判别公式、调整原则和方法。该方法减少了大量非关键工序的许多可能开工时间所形成的组合，从而使优化过程的工作量大大减小，使有限时间内的大型工程网络计划的资源均衡优化工作变得可行，使网络计划优化模型进一步完善。     

分支定界法在最优化问题中的应用

分支定界法是一种应用范围很广的搜索算法,本文在最优化问题中充分体现了分支定界法的应用,投资问题上充分体现了分支定界法的优越性。     

纺织产品生产中C_P值的计算

应用工序能力指数（ＣＰ值）分析纺织产品工序质量时，往往出现计算的ＣＰ值低于１，依此分析判断的工序质量和检测结果不相符合，导致了这一方法在纺织品生产过程中很少应用．针对这一问题提出从产品合格率指标要求出发计算ＣＰ值．其结果和实际一致，从而使这一科学方法能够得到推广应用．本文探讨的方法也适用于其他有类似问题的行业．     

混合整数分式多目标规划及其在企业计划管理中的应用

本文将修正的Dakin分枝定界法用于求解带有线性分式目标的混合整数多目标规划问题,提出了“弹性约束”的概念及其处理方法和交互型分枝定界的两步算法,并将其应用于实际问题中。     

有分离调整和移走时间的两机器流水作业总延误问题的近似算法

讨论了一类两机器流水作业的总延误问题,其中每个工件的操作由“调整”步、“加工”步及“移走”步组成,而工件的调整时间和移走时间均独立于加工时间,同一工件的“调整”步及“移走”步在2台机器上可重叠进行,但“加工”步不能重叠,并且第一台机器上没有空闲时间,工件一旦开始加工就不允许中断．给出了该问题的解中工件排列应满足的条件,并根据这些条件构建了几个近似算法．在构建分支定界算法时,利用问题目标函数的下界及近似算法的结果给出了剪支法则,由此说明所给近似算法对某些例子是很有效的．     

冷轧辊生产中机加工环节的关键工序质量控制

冷轧辊的加工过程是典型的多工序、多指标的多元质量控制过程,其关键工序的质量尤需严格控制.以某钢铁公司某种冷轧辊产品为例,描述了其加工环节,在对其进行工序分析的基础上,介绍在其机械加工环节中引进关键工序质量控制的必要性,利用改进的田口质量损失函来确定关键工序,并进行多工序过程能力分析及其指数计算,最后通过案例验证了此方法的合理性和有效性.     

浅议我国土地勘测定界中“3S”技术的应用

土地勘测定界是测定土地使用范围，界址地点以及土地的利用现状，作为土地征收、划拔、出让以及开发等土地流转使用的法律依据，是为行政管理部门的审批土地行为而进行的一项技术性服务。随着信息技术的迅猛发展，GPS、RS以及GIS已经逐步运用于我国土地的勘测定界工作之中，因而3s技术已经被土地勘测定界的相关学者所重视，同时其对行政机构处理土地相关问题的意义也十分重大。本文首先对GPS、RS以及GIS技术做出简单介绍，并探讨我国土地勘测定界中如何运用3s技术。     

多品种小批量成批成套生产滚动计划的生成方法

针对多品种小批量环境下成批成套生产的特点,将加工对象按实际使用率情况分成关键重要零部件和非关键重要零部件两类。根据知识工程的原理,由关键重要零部件的关键工序元知识生成其生产滚动计划;对于非关键重要零部件按照其特性利用"A、B、C分类计划排配法"生成其生产滚动计划。解决了多品种小批量企业产品的成批成套生产问题。     

工件带安装时间平行机排序问题的列生成算法

研究了工件带与加工次序有关的安装时间的平行机排序问题，给出它的整数规划模型，并结合动态规划和分支定界方法，给出它的列生成算法．通过试验表明：算法对中等规模的问题是有效的，它可以计算到10台机器和60个工件甚至含有更多大工件的大规模问题．     

数学优化模型中分枝定界法的研究

一些NP完全问题已有了在实际应用时值得一试的求解算法．本文通过对分枝定界法的进一步分析，采用这种算法，开展数学建模中最优化问题案例的研究．在求解“指派问题”等NP问题上提出分枝定界法的改良思路．     

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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