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1.
描述了一个交互式图形编辑软件(IGES)的设计与实现。该系统具有交互的工作方式、无需编程、使用方便以及图形编辑功能丰富等特点。在简述了该系统的交互式结构原理之后,本文重点对实现中的图形存储、图形打印和文字标注处理的一些特色部分作了介绍。IGES系统用C语言编程实现。  相似文献   

2.
煤矿开采图件设计管理系统   总被引:4,自引:0,他引:4  
针对煤矿开采工程图件设计绘制的特点,提出并初步建立了煤矿开采图件计算机设计和管理系统—MKTG系统。该系统五大模块在一个主模块管理和控制之下,以多层菜单方式实现统一管理,具有较强的图形编辑功能和良好的人机界面  相似文献   

3.
复合文档编辑管理构件是在Windows95环境下设计与实现的。着重描述了复合文档管理构件的架构过程,以及构件内部对插入对象的管理机制。在该构件的支持下,客户程序可以使用户以页的方式建造复合文档,并且可以通过在热点对象上的点击跳转,来浏览整个文档内容  相似文献   

4.
动态图形显示和交互操作是DTS的重要特征,为支持DTS中大量电网图形的编辑绘制,在SUN工作站上设计实现了一个交互式电网图形编辑器DTSGED。文中阐述了DTS对电网接线的基本要求,给出了DTSGED的设计思想和实现方案,其中包括:(1)电网图形数据结构;(2)系统组成和结构;(3)交互式图形用户界面(4)基于图形模板的标准主接线图的自动生成。  相似文献   

5.
部分预应力混凝土结构构件正截面的实用设计   总被引:1,自引:0,他引:1  
提出了部分预应力混凝土(PPC)结构构件正截面设计的一种新的思路,它以PPC结构中所有PPC构件同时满足两类极限状态为设计原则,基本避免了工程设计中常见的试算,设计结果合理、经济.推导了PPC静定结构构件正截面的直接设计公式,并提出了PPC超静定结构构件正截面设计的单位次弯矩法.另外,还对如何有效地利用PPC超静定结构中由于施加预应力而产生的次内力进行了研究,并提出了设计建议.  相似文献   

6.
建立了基于OpenGL的用户界面管理系统UIMS,UIMS提供了直接操作图形对象的语义反馈机制.阐述了UIMS中由对象操作集建立和编辑图形对象集的运作过程,以及图形对象集的组织形式——数据有向无环图的特点.以UIMS为基础,采用继承的构造方式建立了高级图形对象集和专业图形对象集及其相应的操作集,提供了高级用户交互的界面及高级I/O 接口.设计和实现了面向对象的有限元方法(OOFEM),介绍了在FEM 领域中实施面向对象思想的策略.OOFEM 计算结果的可视化由系统的UIMS和高级图形对象主题实现.集成了UIMS和OOFEM 等五个主题,开发出应用于注塑模CAD/CAE的商品化软件包HSC.  相似文献   

7.
提出了部分预应力混凝土结构你件正截面设计的一种新的思路,它以PPC结构中所有PPC构件同时满足两类极限状态为设计原则,基本避免了工程设计中常见的试算,设计结果合理、经济、推导了PPC静定结构构件正截面的直接设计公式,并提出了PPC超静定结构构件正截面设计的单位次弯矩法。另外,还对如何有效地利用PPC超静定结构中由于施加预应力而产生的次内力进行了研究,并提出了设计建议。  相似文献   

8.
论述了CDGTNCP系统的结构及主要特点,介绍了系统分段生成标准数控程序,最后编辑成完整的数控加工程序的设计思想,用文件传送方式实现GTNCP与CD-CAD系统的集成,采用了图形描绘点的零件信息描述方法,对零件信息进行分级描述及输入,实现了输入零件原始信息后自动生成NC加工程序的目的。  相似文献   

9.
注塑模CAD/CAE系统面向对象的设计   总被引:2,自引:0,他引:2  
建立了基于OpenGL的用户界面管理系统UIMS,UIMS提供了直接操作图形对象的语义反馈机制。阐述了UIMS中由对象操作集建立和编辑图形对象集的运作过程,以及图形对象集的组织形式-数据有向无环图的特点。以UMIS为基础,采用继承的构造方式建立了高级图形对象集和专业图形对象集及其相应的操作集,提供了高级用户交互的高级I/O接口。设计和实现了面向对象的有限元方法(OOFEM),介绍了应FEM领域中实  相似文献   

10.
界面光滑的钢管混凝土(CFT)与传统CFT加载方式的区别,是沿轴心受力界面滑移的CFT荷载直接加在核心混凝土上,钢管只对核心混凝土起到约束作用,而不承受任何纵向力.由于优化了加栽方式,使得界面滑移的CFT较传统结构的屈服延迟.分析及试验表明,在轴心受压时,CFT构件较传统构件有更显著的承载力,且界面滑移的CFT将会给约束混凝土带来新的理念和分析方法。  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
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.  相似文献   

15.
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。  相似文献   

16.
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.  相似文献   

17.
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-  相似文献   

18.
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-  相似文献   

19.
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  相似文献   

20.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

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