基于消息队列的分布式系统数据一致性方法研究

为在分布式环境下保持数据的一致性,结合一个实际的容灾系统,对维护分布式数据库数据一致性问题进行了分析.根据对当前数据一致性维护技术的研究和比较,提出一种基于消息队列技术的一种实现数据一致性的方法.该方法通过对数据同步的研究,保证了实际容灾系统在一定条件下的数据一致性.     

基于智能单元的特征语义自动检测

针对基于历史的特征建模中特征语义维护不力的情况，提出了基于智能单元的特征语义检测方法．利用这种方法来辅助零件的设计，能够自动在零件设计过程中检测整个设计历史中特征的形状与功能语义的一致性．     

一种电动汽车锂离子动力电池组一致性评估及维护方法

锂离子动力电池组一致性好坏直接影响着电动汽车使用效率。为了方便动力电池组的使用及维护,需采取一定的方法对电池组一致性进行监控。该文提出一种基于单体电池电压值标准偏差的锂离子动力电池组一致性评估方法,并将电池组一致性分为四个阶段,根据不同阶段采用不同的维护策略。实验通过对电动汽车锂离子动力电池组进行充放电测试,采用文中提出的方法获得了四个阶段的电池组一致性评估曲线,为电动汽车电池使用及维护提供指导。     

程控交换软件设计和维护中的图模型

在程控交换软件设计和维护的问题空间，有两类问题对软件的性能和可靠性有决定性的影响：共享资源的一致性和进程创建顺序的正确性．以一种计算模型——图模型，描述上述两类问题的解空间．叙述了所使用的图模型的概念，给出了图模型的数据表示，对图模型在程控交换软件设计和维护中的实际应用进行了探讨     

基于.NET的一种异常管理模型

异常处理是建立稳定程序的重要措施。用．NET技术设计一种异常管理模型。实现异常的自动记录和通知。讨论了几种常见的记录异常信息的方法，着重于以高度可维护的方式来处理分布式系统下的程序。本模型提供了一种可伸缩性的框架，用高效、统一的方法管理异常，从程序的业务逻辑层把日志和报告的详细信息抽象化，使业务逻辑层和异常处理层解耦，能迅速、精确地通知操作人员当前所发生的问题，为开发人员提供有价值的诊断信息，并减少大量的需要用户创建、测试和维护的自定义异常处理代码，同时使应用程序更加健壮，易于调试。一致性、灵活性和可扩展性使本模型很有实用价值．     

HLR数据库数据的一致性与安全性研究

基于某种ＧＳＭ移动程控交换机归属位置寄存器（ＨＬＲ）数据维护系统的工作原理,详细分析了ＨＬＲ数据库的数据内容、存储结构和操作模式,定义了各种一致性标签及其链表,进行内外存数据和主、备机数据的一致性维护．通过数据校验模块,定时检查数据内容,及时恢复异常数据．这种数据库维护方案简明、可靠,适合于同类数据维护系统的设计．     

基于移动Agent的实时道路交通导航系统模型

介绍一个基于移动Agent的实时道路交通导航系统模型，在模型中，移动交通工具启动时间约束的导航需求，系统计算基于路网的最佳路径和实时的交通数据，并将结果返回给移动客户．为了最小化维护数据的开销，系统采用分布式移动Agent的协作方法，减少通信数量和提高系统的可测量性．设计了一个两级的交通图配置组织实时交通数据来支持导航的需求，以减少系统空间和通信的开销．在系统模型中，Agent使用APoP来维护实时的交通数据的一致性．该模型可以有效地提供及时的导航需求服务．     

基于XML和MSMQ的数据同步系统设计与实现

数据同步技术是分布式数据库中的一个非常关键技术．提出一种基于XML和MSMQ的较为有效的、实用的维护数据一致性的数据同步系统,给出系统结构及模型,并对该系统实现的一些技术细节进行阐述．     

可缩放计算系统的Cache一致性评述与研究

可缩放性是高度并行的多处理机系统的设计目标之一．为此，需要解决Ｃａｃｈｅ一致性问题，使共享数据在各处理机的Ｃａｃｈｅ中保持一致．文中分析了几种常见的Ｃａｃｈｅ一致性方案，认为分布式目录表法和基于软件的方法适用于可缩放多处理机系统．     

一种模糊传感器数据融合的方法

基于模糊传感器数据相关的特性，给出了一种模糊传感器数据融合的方法．该方法从传感器的重要度，各个传感器对模糊命题支持度的一致度，以及传感器重要度对数据融合结果的复合作用3个方面分析了它们对模糊传感器数据集成的影响．定义了一个一致性系数综合反映了这3个因素．基于该一致性系数实现了模糊传感器的数据融合，并将该方法用于工件识别中．     

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