多罐并行发酵过程的弹性停罐调度策略

针对多罐并行发酵过程，基于早先提出的分类函数和调度函数提出了弹性停罐的优化调度策略．利用工业生产过程的实际数据，对现行的固定时间间隔停罐策略和弹性停罐策略两种方案进行了分析比较，证实了弹性停罐策略的有效性．     

赤霉素多罐发酵生产的静态优化

对文题提出了一种控制方案。使生产全程的创利为最高是优化目标,操作变量则是各罐批的流加发酵周期。各单罐罐批效益函数的在线估计是进行发酵周期优化控制的基础。实例证明,该优化方法能给生产厂家带来直接的经济效益。它也适用于生产工艺与赤霉素发酵相类似的一般流加发酵,如抗生素生产过程等。     

工件具有区间限制的批在线调度

研究同构并行机上的批在线调度问题,目标函数是使最大完成时间(最后一个工件的完成时间makespan)最小.工件以批方式到达且每个批中有m个工件,每个工件的加工时间随其批的到达而给定且限定在某个时间区间上.当一批工件到达时,在对其后批的信息不了解的情况下,要立即对该批中的工件进行调度,调度过程中不允许中断.针对这一问题,给出了一个批在线启发式列表调度算法,在同一批中的工件按LPT规则调度,当一批中的全部工件被调度完后,调度下一批中的工件.对算法的最坏情况进行了分析并给出了算法的竞争率.     

黄河骨干水库水沙调度的目标函数构建和应用

基于黄河突出的水沙问题,关于黄河骨干水库水沙优化调度的研究有很多,一个合适的目标函数的构建能够促进优化效果的提升,但目前大多数研究中的目标函数考虑并不全面,且普适性不高.本文提出了一个能够综合考虑水库在社会经济、行洪输沙和生态环境3方面功能,同时兼顾了水库自身的永续发展的目标函数.选取了生态影响、缺水率、发电效益、防洪效益、减淤效益和排沙效益6项指标进行了有机统一.提出的目标函数通过不同的权重配比可在黄河骨干水库通用.将目标函数应用于小浪底水库的优化调度研究中,通过优化调度结果与实际调度结果的比较显示,优化调度过程与实际整体调度目标一致,同时减淤效果更佳,证明了本文提出的目标函数的可靠性,可以用于黄河骨干水库水沙优化调度研究.     

一种基于混合Petri网的批过程动态调度算法

针对批处理过程动态调度问题的特点，以赋色时间限制混合Petri网为工具，建立了批过程动态调度的混合Petri网模型，将批过程的调度问题映射技术为求Petri网中变迁的最优激发序列问题。在此模型基础上，根据动态规划基本原理，以资源的终极利用即最短生产周期作为调度目标，提出了一种基于赋色时间限制混合网模型求取变迁的最优激发序列的方法，并针对实际情况中出现的复杂的中间产品存贮策略，讨论了在各存贮策略约束下该模型中时间限制区间的确定方法，最后以炼钢－连铸生产系统的过程调度为例，对该算法进行仿真。多次仿真结果表明，当任务和设备的初始时刻或者过程的动态过程发生改变时，调度结果各不相同，从而验证了该算法的有效性。     

区间优化方法在水库调度中的应用

应用区间分析思想,将区间优化方法引入水库调度问题,同时以水库防洪调度为例,建立了区间优化模型．结合实例对水库调度区间优化方法进行验证,并与传统的动态规划方法做了对比．结果表明,区间优化方法用于水库调度问题,不仅优化原理清晰、计算方法易于理解,而且所得结果优于动态规划方法．     

MES系统支持下高效卷烟生产调度方法研究

为提高卷烟生产调度能力，提出基于MES系统支持的高效卷烟生产调度方法。构建MES系统支持模型，在该模型中计算生产调度的输出值。并以调度输出值作为自适应学习系数，建立卷烟生产调度的量化评价参数筛选模型，对其筛选，并输出得到卷烟生产调度的检验统计量，构建卷烟生产优化调度函数，实现卷烟生产调度优化。仿真结果表明，采用该方法进行卷烟生产调度的收敛性较好，产出效益高，适用于卷烟生产调度。     

不确定结构的区间可靠性优化设计

对不确定结构的区间可靠性进行了研究，建立了基于区间可靠性的优化设计模型.采用结合嵌套遗传算法和径向基函数神经网络的模型，进行区间的直接优化，解决了基于区间可靠性的优化设计求解问题，避免了间接模型的复杂转换过程.充分考虑了实际工程中设计向量存在扰动的情况，提出了该情况下目标函数波动的约束，使目标函数和约束函数在扰动下依然满足可靠性要求.通过数值算例验证了模型的有效性和优越性.将所提出的模型用于具有区间不确定参数的行车平板优化，结果表明了所提方法的可行性和工程有效性.     

相对效益最大准则与多目标水库随机模糊优化调度模型

提出了相对效益函数的概念及其分析计算方法；应用多阶段多目标模糊优选理论与模型，建立以相对效益最大准则的多目标水库随机模糊优化调度模型．实例计算的结果表明，该模型能够较好地处理水库调度中的经济性与可靠性的关系．     

配合区间车的单线公交组合调度模型

以单条公交线路为研究对象,通过调整线路不同客流分布区间的通过车次数,建立了以社会总体效益最优为目标、对全程车和区间车的发车频率及区间车折返位置同时进行优化的组合调度模型,并与优化后的单一调度成本进行对比,分析了发车频率、折返点位置和费用的关系,以及实施组合调度的边界条件,最后进行了算例验证和灵敏度分析.结果表明,在客流分布不均衡的情况下,组合调度比单一调度可以更有效地降低系统成本,而且不均衡差异越明显,带来的效益越多;在出行量增加的情况下,可以通过合理地配置车辆的形式来降低整个系统的成本.     

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     

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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