快速成形技术中数据模型的自动诊断与修复

结合东风汽车公司车身计算机集成制造系统（ＣＩＭＳ）的研究与设计，讨论了高新技术引起的车身设计方法的重大变革和车身ＣＡＤ的关键技术，介绍了车身ＣＩＭＳ环境和计算机在车身设计方面的应用成果．     

CAD／CAM并行集成系统的研究

随着ＣＩＭＳ的发展，并行工程已成为当今机械工程领域的研究热点，ＣＡＤ／ＣＡＭ集成是实现ＣＩＭＳ的基础和关键，介绍了基于并行工程思想的ＣＡＤ／ＣＡＭ集成系统，并详细地分析了实现集成系统的关键技术。     

CAD／CAM并行集成系统的研究

随着ＣＩＭＳ的发展，并行工程已成为当今机械工程领域的研究热点，ＣＡＤ／ＣＡＭ集成是实现ＣＩＭＳ的基础和关键。介绍了基于并行工程思想的ＣＡＤ／ＣＡＭ集成系统，并详细地分析了实现集成系统的关键技术。     

基于STEP的服装CAD系统标准化

ＳＴＥＰ是国际标准化组织ＩＳＯ正在组织开发的应用于计算机集成制造系统（ＣＩＭＳ）信息集成的产品数据表达与交换标准⒚ＳＴＥＰ不仅是一种规范,更是一种信息交换技术⒀以服装ＣＡＤ系统产品数据交换为背景, 提出了利用ＳＴＥＰ进行服装ＣＡＤ系统数据交换技术的设计与实现⒀该技术在服装ＣＡＤ领域已初步实现了三家服装ＣＡＤ系统间的数据交换     

基于PDM的集成化CAPP系统的研究和开发

ＰＤＭ技术是在数据库基础上发展起来的一门管理所有与产品相关的信息及过程的新技术,越来越多的企业采用ＰＤＭ作为ＣＩＭＳ工程集成框架．ＣＡＰＰ是ＣＩＭＳ中的一大关键技术,它的发展直接关系到ＣＩＭＳ的集成效果,因此研究和开发在ＰＤＭ集成框架上的工艺辅助设计及管理系统显得非常迫切．本文介绍在美国ＥＤＳ公司的ＰＤＭ产品ＩＭＡＮ集成框架上开发的ＳＧＷＣＡＰＰ系统,进一步研究了在ＰＤＭ框架上面向产品对象的集成化ＣＡＰＰ系统的工艺设计方法和集成管理的实现机制     

工程CAD软件述评

介绍目前国际市场上较为流行的工程ＣＡＤ（计算机辅助设计）商品化软件系统、国内ＣＡＤ软件技术的发展情势，并结合这些软件的变量设计和ＣＩＭＳ的实现程度等方面加以论述．     

企业中的PDM设计与探讨

文章指出ＣＡＤ与ＭＩＳ存在的问题及ＰＤＭ产生的必然，并在ＡｕｔｏＣＡＤ及ＦｏｘＰｒｏ集成化的环境下，对ＰＤＭ的实现进行了探讨，解决了ＡｕｔｏＣＡＤ图形系统与ＦｏｘＰｒｏ非图形系统接口等问题。     

CIM－MIS中的销售信息管理与决策子系统

本文对ＣＩＭ－ＭＩＳ中的销售信息管理与决策子系统ＣＩＭ－ＳＩＭＤＳ进行了研究。在对ＳＩＭＤＳ的开发目标、可行性及功能等方面进行分析后，提出了ＣＩＭ－ＳＩＭＤＳ的总体框架，并利用有关开发工具实现了ＳＩＭＤＳ。     

基于 STEP 机械零件的 CAD/CAPP/CAM 集成工具

ＳＴＥＰ标准是国际标准化组织正在开发的计算机集成制造系统信息集成的产品数据表达与交换标准。以ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统为背景，开发了ＳＴＥＰ信息集成工具ＰＭＳＳ。为了使产品数据操作方便与灵活，该工具可以对产品数据进行查询、修改及ＳＴＥＰ文件的重构，并提供ＳＤＡＩ接口、Ｃ语言的调用，以及ＳＴＥＰ中性文件的前／后处理器设计手段，使ＣＡＤ、ＣＡＰＰ、ＣＡＭ各功能子系统方便地达到集成与共享。     

应用STEP实现机械CAD/CAM集成的研究

ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成的关键是建立统一的产品信息模型。ＳＴＥＰ标准提供了产品生命周期的数据表示与交换机制。该文根据ＡＰ２１４中对特征信息的规定所建系统,针对应用的需求及实现的复杂性,建立特征的应用解释模型,形成本系统的应用协议（ＡＰ）。该应用协议是ＩＳＯ－１０３０３ＡＰ２１４的子集,通过ＳＴ－Ｄｅｖｅｌｏｐｅｒ的ＥＸＰＲＥＳＳ语言编译器生成数据字典,ＣＡＤ系统根据应用协议生成面向加工的零件特征模型;ＣＡＰＰ采用派生式生成工艺规程;ＣＡＭ根据ＣＡＤ提供的特征模型和工艺规程生成刀位文件;ＣＡＭ－ＰＯＳＴ根据刀位文件生成ＮＣ代码。ＣＡＤ,ＣＡＰＰ,ＣＡＭ均由系统开发的ＡＰＩ／ＳＤＡＩ进行前／后处理,并通过ＳＴ－Ｄｅｖｅｌ－ｏｐｅｒ实现产品数据的交换与共享,达到ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成。     

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