基于改进的三层BS模式的工程训练系统设计

在各大工科院校工程训练管理系统中,针对三层B/S模式实时实施过程中服务器负荷过重、数据往来频繁、带宽限制等情况,提出了一种改进的三层B/S模式,并利用XML数据岛、AJAX等流行的网络系统开发技术实现,以减轻服务器负载压力,在带宽限制下提高WEB系统的实时性能.     

藏语语料库管理系统中读写数据粒度问题的研究

应用体系的执行效率、访问速度、服务器的负荷、数据处理的安全性、读写数据的粒度是影响系统性能的主要因素.本文在分析藏语语料库应用体系的基础上对藏语语料库管理系统中读写数据的粒度问题进行了探讨,并采用值对象解决了用户通过大量细粒度的调用读取数据时造成的系统性能下降的问题,从而在一定程度上提高了藏语语料库管理系统的性能.     

Ajax技术在J2EE框架中的应用

针对目前基于J2EE应用的Web系统中频繁刷新页面、引起网络流量增大、服务器负荷加重和页面更新时间较慢等问题,通过对传统J2EE典型架构的分析,综合利用Ajax技术与J2EE框架中的Servlet技术,设计并实现了一种基于Ajax技术的Web应用系统;采用Ajax异步调用Servlet的方式,在不增加网络带宽和浏览器插件的情况下,能很好地改善对大量数据刷新显示的过程。     

不完全停机下的系统数据迁移方案与实现

随着医院信息化的不断发展,应用负荷的不断增加,服务器超出正常负载能力,医院将面临服务器升级的问题.数据迁移是服务器升级过程中最重要的环节.数据迁移过程中一定要保证数据安全、无损、完整地从旧数据库服务器迁移到新的数据库服务器上.我们了解的传统系统升级和服务器升级的数据迁移操作,采用的是在业务系统完全停用的状态下,对系统历史数据进行迁移.这种数据迁移方式虽可保障数据库上的所有数据进行有效、安全、完整的迁移,但系统停用对于整个医院医疗活动的影响很大,如何能实现将旧数据库服务器上的所有历史数据转换到新的数据库服务器上,并且在数据迁移的过程中,不停用业务核心部门的系统应用.本文就广东省妇幼保健院HIS服务器升级过程中实现不停用业务核心部门的系统应用情况下对数据迁移的安全保障实践作一讨论.     

ASP技术在选课系统中的应用

在选课系统中利用ASP实现客户端与服务器间的数据交换,它能快速地从数据库大量的数据中提取符合条件的数据,并将用户数据返回到服务器,实现课程的选择、修改、删除、添加等功能,笔者在所开发的选课系统中内嵌了ASP脚本,使得该选课系统更易维护、更安全、更稳定。     

虚拟化技术在校园信息化建设中的应用研究

随着校园信息化建设不断深入,校园内部应用系统不断增多,需不断购置新服务器以满足需求,因而造成服务器运维管理成本高,也使得机房的空间利用率低、能耗高,难以满足业务迅速发展的需求。分析了校园信息化建设中存在的一些问题,提出了使用硬件设施集中、数据集中、应用服务集中的虚拟化技术构建校园数据中心基础平台的方案。     

网格技术在金融领域的应用

网格技术以其独具的计算能力和资源共享优势在金融领域拥有广泛的应用前景.目的是将金融领域异地、异构的各种高性能计算机、数据服务器、存储系统等通过高速互联网络连接并集合起来,共同完成数据大集中、灾难备份、金融产品建模和风险分析等重大应用的研究,实现金融数据资源的统一共享.     

分布式电能质量信息系统设计与实现

 分布式电能质量信息系统是指采用了分布式技术设计和实现的电能质量信息系统。建设电能质量信息系统是提高电能质量、保证电网安全供电的重要方法。传统的电能质量监测系统包括数据采集、数据计算和数据分析子系统。随着监测点数量的迅速增加,各子系统的工作负荷成倍增加,导致系统效率低下。由于系统处理能力的束缚,系统中允许的监测点数量受到限制,迫切需要解决电能质量信息系统的性能瓶颈问题。本文采用分布式体系结构进行设计,即用分布式处理系统进行数据采集,用分布式数据库进行数据存储,用分布式计算进行数据计算,用WebService接口封装数据访问,经济、有效地提高了系统的处理能力和响应速度,解决了服务器负荷上限问题,满足了供电公司未来大量增加监测点的需求。     

基于SWAT模型的江西八里湖流域氮磷污染负荷研究

基于SWAT模型, 通过社会调查和统计数据获取模型所需的空间数据及污染源输入数据, 构建江西八里湖流域的氮磷负荷模拟模型, 并利用当地 2010—2014年的气象、径流和水质观测资料, 对模型进行率定和验证。依据该模型, 分别在时间和空间上对研究流域的氮磷污染物分布进行模拟。结果表明: 流域氮磷污染主要来自城镇生活源、农田施肥和畜禽养殖, 工业源最少; 氮磷负荷主要集中在汛期(5—9月), 占全年的55%, 汛期污染负荷主要受农村生活和农业施肥的面源影响, 随着降水增大等因素导致冲刷作用增强, 径流中总氮和总磷的负荷也随之增大。氮磷等营养物负荷主要分布在流域内人口密集的九江县、浔阳区和庐山区, 与对应区域大量城镇生活污水的排放相关。     

基于移动代理(Agent)的智能爬虫系统的设计和实现

提出了一种基于移动代理的的爬虫系统,系统中爬虫代理运行在远程Web服务器上,它将集中在服务器端的任务如特征提取、建立索引等分散到远程的Web服务器上并行运行,而且代理个数是可控的,最后将少量的数据回传到服务器端,这不仅提高了效率而且减小了网络传输量.     

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