用Delphi开发数据库应用功能的DLL程序

用Delphi开发数据库应用程序时,如果程序中数据访问代码发生变化,需要重新编译并更新应用程 序,烦琐且易出错.把主程序与数据访问部分代码分隔开,把与操作数据库相关的部分做成DLLs,当用户对数据操作的需求发生变化时,修改DLLs的相关代码并将该DLLs拷贝到使用者处,这样可及时满足用户需求,不断完善程序功能,也便于更新版本.     

便携式多媒体播放器GUI设计及水波纹效果实现

GUI图形用户界面是用户和设备交互的媒介,是应用程序与操作系统之间的桥梁。设计了一款适用于便携式多媒体播放器PMP的轻量、便捷、友好的嵌入式GUI系统。该PMP GUI的窗口系统支持多任务和多图层操作,允许在多个图层上面创建窗口,并提供完善的异步和同步窗口消息通讯机制。在PMP GUI中,窗口是GUI管理的基本单位,该GUI采用事件驱动编程。基于PMP GUI,开发了一个水波纹效果的应用程序,验证了该GUI系统的可行性以及具有轻量级、界面友好、应用开发方便的特点。     

基于μCOS-Ⅱ技术的考勤机设计

基于STM32系列微处理器的考勤系统终端,硬件包括STM32F207最小系统、以太网通信单元、SD卡存储单元、ID卡识别单元、摄像单元、TFT液晶触摸单元、检测及控制单元及电源供电电路;软件嵌入了实时操作系统μC/OS-Ⅱ、LWIP轻型IP协议栈及用户图形界面μC/GUI.终端采取无源ID卡识别与头像数据采集同步进行的方式记录员工的出勤情况,一方面将与ID卡对应的头像信息以文件形式保存至本地SD卡,以供查询;另一方面将信息通过以太网传送至上位机,并由上位机完成考勤统计.利用Keil MDK软件及金龙STM32F207开发板实验仿真表明:终端运行可靠,传输稳定,操作界面友好,实现了设计功能.     

基于Simulink的USB数据传输库的实现

Simulink 是一个强大的系统建模、仿真和分析的图形化工具包,提供了大量的模块,方便用户快速的建立动态的模型.而且利用 MATLAB的RTW能直接将Simulink所建立的模型生成优化的、可移植的代码,并根据目标配置自动生成多种环境下的不同程序.这个功能可以使得设计人员从编写嵌入式软件代码的繁复工作中解脱出来,将主要精力集中在系统设计上.然而Simulink 嵌入式目标模块库中的DSP与PC的通讯接口模块过于简单,速率较低,不能满足大数据量的要求.作者在Simulink上开发了USB数据传输库,能通过RTW生成特定硬件平台的执行代码.实例表明,该模块成功有效,可以极其方便的应用在各种需要与目标实时通讯的场合.     

利用反射技术实现程序结构优化设计

在计算机应用程序的开发过程中,软件结构的前期设计对代码实现和后期维护、扩展和升级等工作的影响重大,直接影响软件的代码编写规模、可扩展性等。良好的结构设计能够缩小软件规模,提高代码的复用率。其中,总线式结构设计是维持软件可扩展性的一种方法。将软件按功能设计为不同的模块(插件),将这些模块组合在一起,通过总线管理各个模块协同工作。当软件需要扩展时,加入新模块或更新旧模块就可以实现。该文讲述的是基于总线式的结构设计方法,利用.NET框架中的反射(Reflection)机制对类型信息的描述能力,提出一种模块组合结构的优化方法,用来增强软件的可维护性,并保持对用户自定义数据结构的处理能力。     

进程间通信技术在系统集成中的应用

集成了大型机移植到微机上的图形学算法模块,并增加GUI(graphic user interface)界面。使用Windows进程间通信技术来实现GUI界面和控制台程序间数据通信。利用管道技术并结合某曲面造型系统开发要求,编制了一个进程间通信的中介模块,给出该模块的代码和执行流程,在系统运行时通过直接调用中介模块实现GUI菜单命令驱动算法执行的数据交互。中介模块经适当修改后可以解决类似场合的数据通信问题。     

智能客户端应用程序的代码访问安全问题研究

主要讨论了智能客户端应用程序中的有关安全性问题,给出了一些基于代码访问安全的安全性设计原则,它对智能客户端应用程序安全性的管理是代码级的,而不是用户级.     

基于DM642的视线跟踪系统的实现与优化

基于PC实现的视线跟踪系统普遍存在执行速度慢、不能满足实时应用需求等缺陷,本研究以TI公司的TMS320DM642图像处理芯片作为数字图像处理硬件平台,以DSP/BIOS为实时操作系统,利用CCS开发环境构建应用程序,对程序整体结构框架进行了改进,对核心模块和代码逐个进行优化,以实现和优化基于DM642嵌入式系统的视线跟踪技术.     

用VB实现用户登录与用户信息修改的探讨

探讨了应用VB实现用户登录与用户信息修改等模块的原理，选择了其实现方案，并提出了一种采用Data Control访问VB6．0内置Microsoft JET DBEngine的具体实现方法。这种方法提高了系统代码的重用性及运行效率，可以作为VB访问数据库的技术，移植到其他数据库应用程序中。     

TMS320C6201 FLASH 引导方式的研究

基于TMS320C6201 DSP的嵌入式系统开发中,上电时需要将应用程序代码从DSP外部ROM中装载到内部的RAM中.对C6201的C语言运行环境和系统初始化过程进行了研究,采用了加载时初始化变量的模式,提出一种自动初始化变量的方法,避免了系统运行时通过加载.cinit段初始化变量,确保了DSP程序自动加载后正常运行.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-