Oracle 9i数据复制技术在教务系统中的应用

Oracle 9i针对分布式计算的需要,提供了一套功能强大的数据复制解决方案。本文概述了Oracle数据复制的分类、Oracle高级复制的发展及应用。介绍了Oracle 9i高级复制技术中常用的基本概念、特点,分析了各种复制技术的优缺点,最后确定了一个完整的复制方案,并应用到实际中。     

异构数据库间的数据复制技术及其应用

介绍了数据复制技术 ,针对实际应用构建了数据仓库的DB—ODS—DW三层体系结构 ,并实现了异构数据库之间的数据复制 .     

一个数据库双向复制的解决方案

描述了几种常用的数据库双向复制模式，并提出了一种更为灵活的复制方案。该方案支持双向复制，能够选择被复制的数据，并且数据可以位于不同类型的数据库服务器上。它易于扩展，具有较高效率和高可用性。     

匹配液对复制多路合成彩虹全息图的影响

圆筒状合成彩虹全息图可以将各种二维图象合成为伴有动作的360度立体动态影像，液晶技术的引入应用空间更为广阔，使用多路合成彩虹全息图复制系统解决了这种全息图的批量复制问题．本文对多路合成彩虹全息图接触式复制过程中如何提高复制全息图的成像质量进行了探讨．使用PFG—01胶片拍摄的基元全息图模拟合成彩虹全息图的母板，讨论了分别使用二甲苯及饱和蔗糖水溶液作为匹配液对衍射效率及漫射噪声的影响，并对添加匹配液后产生的再现光角度的偏移进行了分析．     

分布式数据库系统中数据一致性维护技术的研究

数据复制是分布式数据库中数据一致性维护的一种常用方法,它可提高数据的可用性和系统的性能.设计了一种基于索引的数据复制控制方法,有效地减少了网络中的通信量,没有使用锁、主副本等技术,避免了死锁的发生.     

在powerbuilder中实现图形图像的处理

在powerbuilder的开发环境中提供了复制与粘贴的函数,但都是针对文本数据的,对于图形图像的复制与粘贴并没有提供内部的函数.本文通过创建一个用于处理图形的可视用户对象,实现图形的复制与粘贴以及图像的处理.     

基于文献计量的某高校作者发文、合著及学科发展情况可视化分析

综合采用科学知识图谱可视化软件(CiteSpaceⅡ、HistCite、Network Workbench(NWB)、Science of Science(Sci2)),对在2008—2012年间某211重点高校发表的被科学引文索引数据库(SCIE)收录的1 884篇文献全纪录格式数据进行统计分析。综合考虑突现值、被引频次和节点中间中心性,利用各种算法找出了该校的核心研究者和具备潜力的研究者,绘制了不同类型的合著者网络图谱,并通过发文所属期刊绘制了该校的学科网络图谱。     

基于UDDI的跨域Web服务注册中心设计与实现

广域环境下,Web服务信息的共享和同步一直是一个关键问题。介绍了如何利用UDDI建立跨域环境下的全局Web服务资源管理中心,实现UDDI节点间的数据同步,并提出了一种基于更改记录的UDDI数据复制方案,采用事件机制,动态监测UDDI数据中心上的数据更新,并基于UDDI复制拓扑图,更新相邻节点的服务信息。实验结果显示和传统数据同步方案相比,在复杂的网络环境里,改进方案平均能够提高20%的系统响应时间。     

带有XylE基因的EB病毒穿梭质粒pFD891的构建

构建了一个以EB病毒为基础、以邻苯二酚氧化酶(XylE)基因为靶基因、以潮霉素B邻酸转移酶为转化细胞的选择标记基因的穿梭质粒。这种质粒既能在细菌中复制,又能在真核细胞中自主复制,并有较高的拷贝数,因而能很容易地从真核细胞中分离出来,并可用来研究基因突变和突变类型的形成机制,建立一种化学物质诱变性的分子检测系统。     

基于语法树的程序代码复制检测方法及其评价机制的研究

程序代码复制(抄袭)检测是计算机软件理论与计算机应用技术中重要的科学问题之一.深入总结了程序代码复制检测的理论方法和技术发展现状,积极探索程序代码在语法树框架下的各种适用性方法,开展基于语法树的多种复制检测方法及其评价机制研究,并详细地阐述了其中的关键问题.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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