面向对象程序设计方法在机械CAD中的应用模式及其实现方法

探讨了面向对象程序设计方法在机械CAD中的应用模式及其实现方法,提出了"广义面向对象程序设计语言"和"广义C 程序"的概念.设计出机械CAD系统模块图,并分析了各功能模块的实现以及彼此间的通讯问题,重点介绍了广义C 程序处理线图表格数据的方法.面向对象程序设计方法在机械CAD中的应用表明,它能提供更加友好的图形用户界面、提高编程效率和运算速度.     

基于UML的机械CAD系统开发研究

研究如何在面向对象的机械CAD系统开发中借助统一建模语言UML与CASE工具———RationalRose来建造一个健壮的和易维护的机械CAD系统.提出了UML面向对象分析在机械CAD系统开发中的一般过程.并对CASE工具在机械CAD系统开发中的应用及其优越性进行了探讨.对提高CAD软件质量及软件开发效率,促进CAD的应用与发展具有一定的理论与应用价值.     

浅谈Auto CAD在机械制图中的应用技巧

从Auto CAD在机械制图中的主要优势入手,分析了Auto CAD在机械制图中的系统应用,以期对机械设计师在学习Auto CAD的过程中有所借鉴。     

浅谈AutoLisp对AutoCAD的二次开发

CAD软件的强大功能与通用化设计,是用户选择时必须综合考虑的一对矛盾体。在此背景下,CAD软件的二次开发具有很高的实际应用价值。本文介绍了当今世界上应用最为广泛的微机CAD系统软件——AutoLisp,对如何借助AutoLisp语言根据本专业的特点开发出适合本专业需要的CAD应用软件,作了比较详细的阐述。     

CAD系统中数据库的通信技术

CAD系统中的数据库的通信问题是数据结构和数据管理的主要内容,解决数据库的通信问题是CAD系统中的一项关键技术.文章提出了几种通信方式,重点论述了利用可视化的高级语言中的数据控件来联系不同结构的数据库,从而使数据库的通信既简单又可靠.     

集成式真空包装机CAD软件包

本文介绍的集成式真空包装机CAD软件包,将HIGH.C语言和CAD系统软件成功的结合在一起,拓宽了CAD的功能,弥补了CAD的缺陷。     

齿轮减速器教学CAD系统的开发

介绍了运用C语言和AutoLISP语言开发的齿轮减速器教学CAD系统.系统利用数据库和参数化绘图将设计计算、结构设计和计算机绘图结合在一起,实现了用计算机辅助设计的方法进行减速器设计.系统应用于《机械设计》课程设计,取得了良好的效果.     

基于部件的涵洞CAD系统

根据涵洞CAD系统的总体设计的功能要求,结合涵洞的结构特点、涵洞设计要求及面向对象的编程方法,提出基于部件的涵洞CAD系统开发方法和涵洞CAD系统的部件划分方法,并开发了基于部件的涵洞CAD系统。在生产实际中的应用表明,该系统具有较强的适应性、可扩展性以及易维护的特点。     

关于机械设计中流体传动CAD系统分析

流体传动CAD系统提供了可视化、可修改、可控制的三维系统,为机械设计提供了高质高效的设计手段.该文介绍了机械设计中流体传动CAD系统的组成及特点,阐述了目前流行的CAD技术,分析了基于AutoLISP语言工具的流体传动CAD系统的二次开发.     

CAD/CAM技术在工艺品生产中的应用

随着工业设计日益兴起,工艺品模型制作已经成为一个专业性的行业。应用CAD/CAM技术进行工艺品模型制作对工艺品设计具有重要意义。工艺品模型制作中CAD/CAM技术的应用主要包括CAD建模技术在工艺品数据模型中的应用和CAM集成NC编程系统在工艺品模型加工中的应用。QQ企鹅模型制作案例验证了这种应用的可行性。     

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