元数据技术在油气资源数据共享服务中的应用

为满足国家级油气资源基础数据库开发需要,针对数据源异构问题提出了一种基于元数据的解决方案.该方案利用面向对象方法和原型法分别设计油气资源总体数据库和各专题的元数据,参照国标制定元数据的构造标准,使用元数据字典表实现数据的组织与管理.研究结果表明:元数据在数据库管理和web发布过程中具有重要作用.     

编辑出版管理系统的数据库设计

在进行大量调研的基础上,分析了目前编辑出版领域用户的需求,确定了编辑出版管理系统要实现的功能. 系统以SQL Server 2000为数据后台,采用规范设计法中的新奥尔良法对数据库分步进行了构建,给出了主要数据库表及主要数据库表之间的关系,确定了数据库的安全机制.数据库的设计完成可为整个系统的实现提供基础保证.     

基于ArcSDE和SQL Server2000洪水灾害信息数据库的设计研究

空间数据库是目前地理信息系统应用的重要支撑部分.洪水灾害数据存在数据量大、种类多、保密强等特点,所以洪水灾害信息数据库的设计也不完全等同于其他空间数据库的设计.结合实际工作,对洪水灾害信息数据库建设中ArcSDE和SQL Server2000的配置,以及用户安全管理、数据入库参数（分块大小、金字塔技术、压缩方式）等技术方法进行了探讨.     

ACCESS中通过ODBC实现FOXPRO与SQL Server数据库的数据传递

ACCESS 2000支持访问各种类型的外部数据库,主要有导入和链接两种方式。本文介绍了使用ODBC管理器建立SQL Server数据源,然后在ACCESS 2000应用程序中利用链接方式,通过OD-BC数据源使外部的FOXPRO数据库与SQL Server中的表进行链接并对该表进行编辑。     

网格环境中异构数据库访问和集成技术的研究

在研究OGSA-DAI的基础上,提出一种基于虚拟数据视图的分布异构数据访问与集成框架.系统由元数据服务和网格虚拟数据库服务构成,其中元数据服务负责发现含有用户所需数据的数据库,网格虚拟数据库服务提供全局逻辑视图,通过分布式查询机制将用户的SQL请求分解到具体的数据库中并进行结果合并,实现数据的透明访问和联合查询.     

树型结构在关系数据库中的描述

把树型结构存入数据库是一个难题.为了解决这个问题,需要把树型结构线性化.通过设计数据库的表结构,把线性化了的树节点数据和节点之间的关系存入数据库,并可用SQL语言进行各种查询.结果通过了ACCESS数据库的验证.     

基于ARCSDE的滇池流域污染源数据库的设计

污染源数据库建设在治理滇池流域中占有重要地位。本文首先对全国第二次污染源普查数据进行资料分析和整理,然后从数据库的概念设计、逻辑结构设计和数据库建设方面详细讨论了污染源数据库的设计。在概念设计阶段对污染源属性表的基本E-R图进行设计;逻辑设计中对污染源信息编码,属性数据库逻辑结构和空间数据库的结构以及元数据设计进行了讨论。     

利用元数据确定封闭模块的数据结构

提出一种通过数据库管理系统中的元数据来确定封闭模块中未知的数据结构的技术。通过利用数据库中的元数据确定封闭模块中用户建立的数据表，并在模块的应用程序运行时动态跟踪数据表的记录条数的变化来确定封闭模块中的部分数据结构。并以SQL Server2000为例，详细描述如何利用数据目录中的sysobjects系统表来确定封闭模块的数据结构，该研究结果在实际信息系统开发中有利于信息系统的集成。     

DM4过程SQL语言的设计与实现

在商用数据库管理系统DM4中设计并实现了过程SQL语言DMPL/SQL.提出了DMPL/SQL语言解释器的总体结构.该解释器由编译器和虚拟机两部分构成.编译器分析源代码并生成中间代码,虚拟机以立即或延迟的方式对中间代码进行解释执行.介绍了实现DMPL/SQL语言解释器的关键技术.为提高程序的执行效率,在名字解析、SQL语句的执行以及异常处理等阶段采用了多种优化方法.该语言目前已广泛使用于基于DM4的数据库应用中.     

基于ADO接口技术的Oracle数据库嵌套表的开发研究

数据库接口技术中,ADO技术是诸多访问数据库接口技术中最灵活而又最能胜任的.VC平台下对数据库嵌套表的开发中,侧重分析了ADO技术开发中最关键的-Parameter Ptr接口对象,对其方法、属性和使用进行了详细的说明.研究了-Command Ptr执行带参数的SQL命令和-Parameter Ptr传送命令相关参数的方法,实现对嵌套表数据的浏览、添加、编辑和删除.实例证明该方法是完全可行的.     

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     

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