基于.NET框架的N层分布式应用程序研究

主要探讨基于N层分布式结构来开发数据库应用程序的具体过程和方法.首先,介绍N层分布式结构的体系结构和工作原理;然后介绍.NET远程处理框架和ADO.NET数据访问技术.最后通过一个简单分布式应用程序实例进一步阐述,说明N层分布式结构可以大大提高分布式应用程序的运行效率和安全性.     

Web Service技术在基于WebGIS的移动目标监控系统中的应用

基于三层结构的分布式应用解决方案是软件设计的热点．在当今分布式应用程序开发中，Web Service已成为最热门的技术．在分析了NET框架中基于Web Service分布式应用解决方案的跨平台、跨系统、高复用性的优点的基础上，利用Web Service技术，结合ArcIMS的ActiveX连接器和ArcXML语言以及ASP．NET技术设计并实现了基于WebGIS的移动目标监控系统．文中首先描述了系统的体系结构，然后详细介绍了Web Service技术及其工作原理，最后通过北京市移动目标监控系统的开发实例介绍了实现过程．     

基于消息中间件的银行综合前置系统的设计与实现

随着银行业务的不断发展和数据的集中,银行前置系统也由分散变为集中;与此同时,银行的分布式应用环境也越来越复杂。所以,中间件技术在开发银行分布式应用系统中的作用越来越大。本文讨论了如何应用面向消息的中间件技术,来设计和实现银行综合前置系统。     

分布式对象技术及客户机/服务器体系结构

分布式对象技术为分布在网络中的对象提供了一种链接机制，关于分布式对象，作为用户来说只需集中考虑需要什么，而不管怎样得到它，这为分布式应用系统的开发提供了基本的技术支持，同时为分布式应用的系统结构的多层次化提供了保证，首先讨论了分布式对象环境、分布式计算环境的特点，然后通过对两种标准CORBA和CDOM的讨论，说明了C／S体系结构的一些新特征，这为基于C／S的分布式应用系统的设计和开发提供了新的参考模型。     

利用JAVA RMI实现分布式应用系统

分布式处理在网络环境中极为重要，文章主要介绍了实现分布处理的Java RMI运行机制，讨论了利用RMI进行分布式应用程序开发的步骤，并给出一个多层分布式应用系统的结构模型。     

基于Python和CORBA的分布式程序设计

提出一种使用Python和CORBA开发分布式软件系统的方法，以降低编写分布式应用程序的复杂度．充分利用了CORBA软件体系结构的特点和优势，能够在不同平台、不同语言之间实现对象通信．给出了一个使用Python语言并基于C／S模式的程序框架，实现分布式环境下的资源共享、代码重用、可移植和对象之间的互操作性．整个框架在分布式计算环境中可作为使用Python和CORBA开发实际软件系统的指导．     

一种分布式应用数据交换系统的设计与实现

为了解决数据交换中适应不同安全级别、不同网络传输要求等问题,设计了一个基于消息中间件、支持不同数据优先级、不同密级和不同时段传输的可控数据交换系统(AppSwitch),并利用Java语言,基于IBM-MQ,实现了整个系统.该系统能够根据预先确定的安全要求、数据传输和交换策略,实现不同分布式应用系统之间异构数据有效的交换,达到系统互连互通的目的.系统的成功运行表明,通过在消息报文中增加加密标志、消息优先级别字段,在传输安全策略中增加时段控制等措施能够有效地解决该问题.     

利用微软事务服务器MTS开发酒店管理系统

MTS是基于组件的事务处理系统，为开发基于组件的分布式应用程序提供了环境．主要介绍了MTS在组件开发中提供的分布式、事务、安全性支持，并成功地应用在酒店管理系统中．     

基于SOAP协议的分布式应用研究

介绍基于SOAP协议的分布式应用，讨论如何在分散、异构的Internet环境中实现信息的传递和服务调用。     

分布式PowerBuilder应用程序的调试策略和方法

由于分布式应用的独特性,使得分布式应用程序的调试远比单机应用程序的调试复杂得多。文中对分布式应用程序提出一种“先单机单机程调试,次单机多进程调试,最后再多机远程调试”的调试策略,给出在PowerBuilder开发环境下的实施方法,并对分布式PB应用程序的常用调试工具、技术和调试中应注意的问题进行探讨。所述策略和方法知开发《广西变通高校计算机等级考试管理系统MCT》网络版中得到成功使用,证明是正确可行的。     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.