城市负荷空间分布的聚类感知方法

基于大数据技术准确把握配电网负荷发展态势将为精细化规划提供依据，解决城区供电分区混乱问题.本研究提出城市负荷空间分布的聚类感知方法，首先开展用户信息收集筛选建立样本数据集，采用基于密度峰值的快速聚类算法，以各电力用户样本点的局部密度和样本间距为指标进行聚类，聚类所得群簇对应于一定容量变电站供电分区的负荷分布，以聚类群簇作为基本单元，分析群簇属性指标包括群簇簇头空间坐标、群簇负荷总量、群簇负荷密度、群簇用户总数、群簇最大半径、群簇平均半径等，建立以群簇属性为要素的城市电力负荷态势感知模型，在特定的时间和空间对城市电力负荷群簇进行分析以准确把握城市发展态势；最后以某城市供电网格为例，验证所提方法有效性.     

基于Multi-index LQ与CIC指数的集成评估框架

将多指标区位商计算和工业集群竞争力评价相结合,生成集成的工业集群竞争力评估框架,运用统计数据,可对我国区域工业集群现状及工业集群竞争力水平进行分析.结果表明,区域工业经济存在4种类型,即集聚的竞争优势产业、集聚的竞争劣势产业、非集聚的竞争优势产业和非集聚的竞争劣势产业;据此,我国区域工业经济的支柱产业和主导产业可以被确定.     

能量自治无线电能传输微网及其簇群机制

针对无线电能传输微网无外部能量注入的能量自治情况,提出一种不均匀簇群机制及其相关算法.节点群周期性进行簇群选举,簇首由节点轮流担当,并考虑候选节点能量特性,以保证网络能量负荷均衡,同时通过簇群的不均匀结构在负载节点附近建立能量缓冲带以提升能量供应的稳定性,引入簇间节点减少簇群间能量传输损耗.具体分析了簇群机制的能量损耗并建立了相关网络能量损耗模型.仿真结果表明:相对普通簇群机制,提出的无线电能传输微网簇群机制有效地改善了能量负荷均衡特性,从而提升了网络最大稳态期.     

基于主成分分析的中国工业科技竞争力评价

科技竞争力是产业竞争力中最重要的构成因素.产业科技竞争力综合评价对于全面、科学、客观地反映产业依靠科技进步提升竞争力的潜力具有重要的参考价值.评价产业科技竞争力的方法有很多,尝试采用主成分分析法,举例对2002年中国工业主要10个产业的科技竞争力进行综合评价,并依据评价结果对中国工业主要产业科技竞争力进行分析.     

我国西部地区工业企业竞争力优势的实证分析

企业竞争力是一个可以从多层面表述的综合性很强的概念,针对不同的研究对象和研究目的有不同的解释。一个指标或部分指标是不足以反映企业的综合竞争力状态和水平。因此,就必须要根据工业企业竞争力的定义和特点,用广泛、集成的眼光构建一个层次分明、结构完整、指标可比的指标体系。并通过该指标体系,采用实证的方法分析工业企业发展进程及存在的问题,进一步挖掘我国西部工业企业的发展优势,为评价西部工业企业综合竞争力提供服务。     

逆向物流供应商的二元语义多属性群决策

为企业选择最佳的逆向物流供应商以降低运营成本,提高企业竞争力,建议采用二元语义多属性群决策法进行决策。将所有评价指标的语言评价值转化为二元语义,通过最小化决策群对评价指标判断的偏差为各评价指标赋权,运用二元语义混合有序加权平均以得到备选方案的最终评价值,根据备选方案最终评价值的大小选择最优供应商。通过设计具体算例与直觉模糊多属性群决策法比较发现:基于二元语义多属性群决策法不仅减少了主观偏好评价的影响,而且评价结论更加精细。     

黄河流域高质量发展下济源工业竞争力灰色关联分析

工业是黄河流域多数经济体的支柱产业,对工业竞争力的研究是黄河流域高质量发展的必然要求.工业竞争力的影响因素众多,在产业竞争力波特钻石模型基础上,结合济源工业发展实际构建了 6个一级指标和19个二级指标,采用灰色关联法对济源工业竞争力进行了分析,结果显示济源工业与政府财政收入关联度高,但整体的创新能力较低、研发投入不足.提出济源工业要紧抓黄河流域高质量发展机遇,协调发展传统产业和新兴产业,加快产业集群化,合理构建产业布局,以创新驱动工业产业转型升级.     

河南省城市旅游竞争力综合评价模型的应用研究

研究了河南省城市旅游业竞争力,选择加权求和多指标综合评价模型,即T=∑WiPi(i=1,2,3,…,i=1n),其中T为城市旅游业竞争力的综合值,Wi为第i个评价指标的权重,Pi为第i个评价指标的分值,n为评价指标的数目,计算城市旅游业竞争力的数值.依据综合值,给出城市旅游业竞争力提升的对策.     

基于VIKOR混合多属性群决策的供应商选择

为科学决策选择供应商,企业应吸纳有竞争力的供应商参与竞争,通过建立供应商评价指标体系,充分考虑供应商的比较优势,建构科学评价模型进行决策。根据混合多属性群决策的特点,采集混合的主客观评价指标信息,形成了科学的集结与规范化方法;然后运用层次分析法和离差最大化法相结合,确定评价指标权重,构建了VIKOR混合多属性群评价模型;最后以第三方物流供应商选择为算例,形成决策结论。     

基于熵权TOPSIS法的国内机场竞争力评价

从机场基础设施建设、机场运营规模、机场服务质量、机场交通地理条件4个方面建立了评价机场竞争力的10个指标,选取36个国内机场作为研究对象,使用熵权法计算出10个评价指标的权重,利用TOPSIS法建立了机场竞争力评价模型,并对机场竞争力进行了评价.结果显示:从机场竞争力评价指标权重看,决定机场竞争力的核心指标有货邮吞吐量、旅客吞吐量、飞机起降架次、跑道数量和机场投诉件数.要想提高机场竞争力,必须加强机场基础设施建设,特别是增加跑道数量.从竞争力排名结果看,中西部机场竞争力明显弱于东部机场.特别是中部地区,只有郑州和武汉两个城市入围竞争力前18名,甚至低于西部的数量,促进中部崛起刻不容缓.因此,我国应该加大对中西部机场的扶持力度.     

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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