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。     

论CAPP的创成模式

本文论述了系统运用成组技术原理，提出了检索，创成综合模式。其特点是按相似零件组编组工序、工步词典，以工序工步词典为索引建立相应的工艺决策规则。在系统软件实现方面，运用编译原理、构造词法、语法分析器，对规则或知识进行预处理，形成特定的语法结构，使知识库与推理机相互独立。     

板材折弯弯曲工序的计算机辅助自动生成

利用基于特征信息建模生成零件的设计模型，通过加工特征自动提取和制造决策知识规纳，运用知识Ｐｅｔｒｉ网建模，开发了板材折弯计算机辅助工艺规划系统。该系统根据输入的零件图形自动生成折弯工序，并在计算机上进行仿真，成为ＣＡＤ和ＣＡＭ之间联系的纽带。     

板材折弯弯曲工序的计算机辅助自动生成

利用基于特征信息建模生成零件的设计模型，通过加工特征自动提取和制造决策知识规纳，运用知识Ｐｅｔｒｉ网建模，开发了板材折弯计算机辅助工艺规划系统。该系统根据输入的零件图形自动生成折弯工序，并在计算机上进行仿真，成为ＣＡＤ和ＣＡＭ之间联系的纽带。     

回转体类零件工艺规程自动生成系统

本文针对某机械厂回转类零件研究了半创成式的工艺设计系统.系统采用形素法描述零件,用成组代码等表达零件信息,运用定义标准工步、形体组合和分级推理决策方法等实现工艺规程设计和工序图的自动输出.     

滚动轴承 CAPP 专家系统的研究与开发

对滚动轴承零件工艺设计领域专家系统进行了研究，研制了ＲＢ－ＥＳＣＡＰＰ系统。系统中采用了交替运行几种语言的技术，并解决工序图的自动输出问题。     

一种数控加工图形自动编程系统

本文介绍了一种用于加工中心的图形自动编程系统（ＬＧＡＰＳ）。该系统具有图形输入、自动工序设计、自动编制ＮＣ加工程序单、加工过程模拟等功能。该系统用特征法来建立零件信息描述体系，是一种ＣＡＰＰ／ＮＣ自动编程集成化的图形编程系统。     

基于面向对象的CAPP模型及其实现

将面向对象技术应用到ＣＡＰＰ的研究中，在对象分析的基础上，提出基于ＯＯ的ＣＡＰＰ模型，以零件，特征型面，工序，工步等对象为知识单元，建立了工艺设计过程中的工艺规划知识规则集，探讨了该模型的实现。     

基于 I-DEAS Geomod 建立 CAD/CAM 集成中的机械产品模型

在建立零件Ｂ－Ｒｅｐ形式实体模型的基础上，通过提取形状特征，附加工艺信息特征，可以建立机械零件的产品模型，作为ＣＡＤ／ＣＡＭ集成中的模型输入。基于现有成熟的商品化软件Ｉ－ＤＥＡＳＧｅｏｍｏｄ进行了开发。     

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.     

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.     

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     

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