JDO持久化技术应用于Struts框架的模型

为了将JDO技术的对象持久化优势蕴涵于Struts框架中以便于进行高效的Web应用开发,探讨论证了把JDO对象持久化技术运用于Struts框架的可行性,提出了一个多层体系结构模型.     

采用GAE技术实现数据的虚拟存储

随着云计算的发展,虚拟存储得到广泛的应用,本文以GAE为研究平台,分析了其使用的两项虚拟存储技术BigTable和GFS,并在Web服务器开发中以JDO和GaeVFS实现了用户数据文件的虚拟存储。     

多种数据持久层解决方案的对比

数据持久层是J2EE体系结构中用来解决对象和关系数据库之间不匹配问题的中间件。目前实现数据持久层的方案有很多,本文对JDBC、JDO、Hibernate、iBATIS等数据持久层实现方案进行介绍,通过对比分析指出它们各自优缺点。     

基于J2EE的网络教学平台的设计与实现

在分析JDO、MVC2模型、Struts框架和数据库连接技术的基础上，对比已有教学平台的不足之处，阐述了如何利用J2EE的各项技术开发跨平台、稳定实用、功能强大的网络教学平台(ETP)，并对该系统中一些适用关键技术和难点进行了详细说明。     

Struts和JDO的Web应用

网络技术的发展促使应用系统结构由C／S结构到B／S结构的转变，因而要构建一个具有高稳定性、可扩展性、可维护性的应用系统，B／S结构的设计就极为重要．在简要介绍MVC软件设计模式和存储层设计的基础上，提出了Struts和JDO两种技术相结合的B／S开发结构，而这种B／S结构可以用于构建强壮的中小型Web应用系统．     

基于关系模式的本体学习研究

对本体和关系模式做详细比较和分析,从关系、关系之间的联系、属性、约束、实例这些元素出发,提出了关系模式向本体的详细映射规则。设计了基于关系模式的本体学习系统,验证了方法的有效性。     

制图综合中空间关系相似度的集成表达

基于空间关系的概念邻域,研究了空间实体多尺度表达中空间关系变化程度的比较和计算问题.首先从数字景观多尺度表达的角度对空间关系包含的拓扑关系、方位关系、距离关系分别建立了具有适当空间关系分辨率的概念邻域结构,其次,基于已建立的空间关系概念邻域给出了多尺度对象空间关系差异程度的集成表达和度量方法,从而得出了空间关系相似度的计算公式,最后结合实验数据的分析和计算,证明了该空间关系相似度集成表达模型和计算方法的合理性及适用性.     

随机变量间的相互关系与分类

对2个随机变量的关系进行研究,首先引述了协方差和相关系数的概念,对相关系数从2个方面给出其内涵的深刻解释,阐述了相关系数与相关关系、线性相关与不相关之间的联系。其次,对随机变量的相关关系、线性关系、不相关关系及独立关系和非独立关系等分别进行了详细介绍,深入挖掘各种关系深刻内涵,揭示各种关系的内在联系。特别是对不相关关系、非独立性和独立性几种关系,通过实例进行了深入探讨。最后,对随机变量之间的各种关系进行分类,给出随机变量间按相关性优先划分的各种关系分类图,为初学者学习2个随机变量间的关系提供系统依据。     

二元关系传递性与反传递性的判定

本文给出了关系运算法、关系图法、关系矩阵法、关系复合矩阵法判定二元关系的传递性和反传递性,分析了传递性和反传递性之间的联系,并建立了判定传递性和反传递性的算法,最后利用C语言编程实现.     

加强企业科协自身建设的对策

阐明了正确认识和处理好＂五大关系＂的意义,即重点和一般的关系、主动和被动的关系、科普和论文的关系、职能与服务的关系、投入与创新发展的关系,这是企业科协加强自身建设的基础。     

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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