一种箱体类零件CAPP专家系统零件模型建立的方法

对零件信息的描述过程就是零件模型的建立过程。零件信息描述得准确、完整与否将对ＣＡＰＰ系统的质量和可靠性具有决定性的作用，它一直是ＣＡＰＰ中的一个难题。尤其面对结构复杂的箱体零件，更是一件难题。探讨了单件小批生产条件下有关箱体类零件ＣＡＰＰ 系统开发中的有关理论和技术问题，介绍了用于箱体类零件的一种信息描述方法——基于零件方位特征的分层式特征信息描述方法，以及如何建立零件信息模块及框架结构等内容。     

从CAD系统获取CAPP系统所需信息的方法

在将ＣＡＤ系统与ＣＡＰＰ系统集成的过程中，往往由于两者在计算机中对形体描述方式的不同，而使ＣＡＰＰ系统难以直接从ＣＡＤ系统的数据库中获取零件信息。本文通过对上述两类系统的分析，提出了一种将不同模型的ＣＡＤ系统信息，通过ＩＧＥＳ转化为ＣＡＰＰ系统能够接收的信息的方法，省去了工艺规程设计之前对零件信息的二次描述，具有较大的实用价值。     

SJ—CAPP专家系统中零件信息的描述与输入

提出用于盘套类零件信息描述的一种方法，在ＳＪ－ＣＡＰＰ专家系统中加工表面的信息用表面元素法来描述，借助于某单技术可以方便地解决零件信息的输入问题。     

面向CAPP系统的回转零件信息描述方法的研究

本文根据ＣＡＰＰ系统对零件信息描述的要求，通过对回转零件特征的分析和描述方法的研究，建立了一种适用于各类回转零件的零件信息描述模型。该模型所表示的描述方法能较好地解决ＣＡＰＰ系统的信息输入问题     

CAPP中零件信息输入及其发展趋势

零件特征信息描述和输入是ＣＡＰＰ系统的基础和依据，是ＣＡＰＰ系统首先要解决的问题，本文分析了ＣＡＰＰ系统零件信息输入现状，说明了ＣＡＰＰ系统零件信息输入方法的发展趋势。     

集成化CAPP系统回转类零件信息模型的研究

论述了集成化ＣＡＰＰ系统回转类零件信息模型的构造过程，以轴类零件为例详细介绍了信息获取方法和具体结构，最后对回转类零件信息模型的主要特点进行了讨论。     

非回转类零件计算机辅助工艺设计的信息描述

本文论述了非回转类零件计算机辅助工艺过程设计（简称ＣＡＰＰ）中，零件信息的描述和输入方法。在相似零件组的基础上，把ＣＡＰＰ系统所要处理的零件按其重要性和复杂性又划分为Ａ、Ｂ、Ｃ三类。本文提出了方位特征描述法、基准特征描述法，并采用特征图引导，菜单输入的方式，较好的解决了Ａ、Ｂ、Ｃ三类零件信息的输入。     

一个集成化箱体类零件CAPP系统

集成化ＣＡＰＰ系统的开发，不仅是ＣＩＭＳ环境下信息集成的要求，也是ＣＡＰＰ的发展方向，本文着重介绍一个集成化的箱体类零件ＣＡＰＰ系统的总体结构及其实现的关键技术。     

基于MDT API箱体类零件加工特征识别与提取

本文以ＡｕｔｏＣＡＤ ＡＲＸ开发环境下的ＭＤＴ ＡＰＩ的特征建模实用工具为基础，通过对箱体类零件加工特征分析和归纳，开发了箱体类零件加工特征的识别与提取系统，为实现ＣＡＤ／ＣＡＰＰ信息集成提供了一种切实可行的解决办法。     

集成环境下基于特征的CAD／CAPP零件信息集成的实现方法

在详细分析零件的ＣＡＤ特征模型与ＣＡＰＰ特征模型之间关系的基础上,提出了一种集成环境下基于特征的ＧＡＤ／ＣＡＰＰ系统信息集成的实现方法,系统采用参化特征描述法描述和输入零件信息,采用特征数据提取法从ＣＡＤ系统中提取ＣＡＰＰ系统需要的特征信息,在设计堆件的同时,即可产生工艺设计所需的特征信息,在设计零件的同时,即一工艺设计所需的全部信息,从而自动生成零件的加工工艺规程,达到了ＣＡＤ／ＣＡＰＰ系统的信     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~