基于Delphi7.0和SQL Server2000的追溯表软件开发

使用Delphi 7.0开发数据库应用程序的一个难点就是连接数据库。只要掌握了正确连接数据库的方法,就能保证开发的质量。文章主要论述了使用Delphi 7.0和SQL Server 2000开发数据库应用程序时,使用Delphi 7.0访问机制ADO作为连接应用程序和数据库的桥梁,来完成软件的开发。并且针对开发过程中遇到的两个问题,给出了解决方案。     

水库监控系统功能实现及应用

文章介绍了利用工控软件"组态王"开发水库监控系统,并结合实际的项目,详细地讲述了画面的制作、数据库的建立和连接、设备的配置以及节省变量的技巧。     

00A技术在采矿CAD软件开发中的应用

以矿井交岔点CAD软件的开发为例,阐述如何利用面向对象思想对采矿CAD软件开发进行系统分析和设计,从而为采矿CAD软件的开发提出了一个新的思路和方法,以提高软件的设计水平和质量。00A技术在采矿CAD软件开发中的应用@王斌@胡古锋...     

大气污染样品类别的分布式计算机判别方法

研究在VisualBasic中通过MATLAB引擎调用MATLAB工具箱函数以及VisualBasic和SQL Server数据库通过ADO进行远程连接的方法,对VisualBasic和Matlab进行混合编程,从而完成了环境模拟中判别分析模型软件的开发应用,并利用该模型解决了某大型化工厂大气样品的污染判别分类问题.所研究开发出的软件与单纯使用Matlab中的ToolBox中的Classify函数相比,可以利用其中的远程调用数据库的功能省去复杂的数据录入工作,还能通过SQL Server数据库增强对实验数据的管理,操作起来简单易行,这种模式对于各类环境模型的软件开发应用具有理论意义与应用价值.     

JSP数据库连接池管理策略分析

在基于JSP的数据库应用开发中,数据库连接的管理是一个重点,因为它是决定应用性能的一个关键因素 文章在对数据库连接进行透彻分析的基础上,提出了一个连接管理策略,使得开发高性能的数据库应用变得相对容易 特别对于连接管理中的两个难点:事务和对异构数据库的连接问题进行了深入的分析,并给出了相应的解决方案.     

JDBC接口稳定性和速度的定量研究

在众多界面与数据库连接方式中,如何选定相对较优的数据库接口,已成为软件与数据库连接需要紧迫解决的问题.以Java2语言为工具,以特定的Oracle和SQL Server为开发研究对象,给出连接数据库的4种接口方式,并对其中的3种连接加以具体实现.使用定量测试方法,对JDBC接口的稳定性和速度进行测试,根据得到的测试结果,分析给出接口类型的使用,并且对其数据库稳定性和速度加以分析,给出定量结果.     

组态软件上位机监控系统设计与开发

组态软件是集散控制系统的重要组成部分,本文将面向对象技术与传统的软件设计方法相结合,使用了Viusal C＋＋、COM等先进的计算机技术,讨论了组态软件上位机监控软件的设计与开发,其中重点介绍了数据库组态和图形界面组态。数据库组态是组态软件的核心部分,而实时数据库又是数据库组态的关键部分,本文对其设计进行了详细的阐述,采用了动态连接库和全局内存的方法来满足工业上对数据实时性的要求。     

数据库连接的高效管理研究

在基于JDBC的数据库应用开发中 ,数据库连接的管理是一个难点 ,因为它是决定该应用性能的一个重要因素 .本文在对数据库连接进行透彻分析的基础上 ,提出并实现了一个高效的连接管理策略 ,使得开发高性能的数据库应用变得相对容易 .特别是 ,对于连接管理中的两个难点 :事务和多线程问题进行了深入的剖析 ,并给出了一个基于设计模式的解决方案     

输电线路地理信息系统数据库的研究与设计

分析了输电线路运行检修与管理所涉及到的线路、杆塔、设备以及日常管理工作中的数据与信息流,提出了以GIS(地理信息系统)软件和数据库软件分别管理输电线路数据的方法,构建了输电线路地理信息系统数据库的框架.输电线路的空间(图形)数据采用GIS软件进行管理,非空间(属性)数据采用关系数据库管理,两者通过集成地图开发的方式进行关联.数据库设计时,定义了设备之间的连接关系与从属关系,例如输电线路与杆塔、杆塔与塔头等,可依据这些关系对设备和输电网络进行追踪.整个系统数据库基于C/S(客户机/服务器)结构,实现网络共享和系统安全性功能.     

面向对象技术在采矿CAD软件开发中的应用

以矿井交岔点ＣＡＤ软件的开发为例，阐述如何利用面向对象思想对采矿ＣＡＤ软件开发进行系统分析和设计，从而为采矿ＣＡＤ软件的开发提出了一个新的思路和方法，以提高软件的设计和质量。     

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