系列产品的参数化造型与自动拼装

结合国家“八五”项目“重型数控机床模块化设计与制造系统”，在Ｉ—ＤＥＡＳＶＩ—ｉ环境下研究并实现了零件的参数化造型与自动拼装．通过创建特征而记录整个设计过程．一个特征对应多个数据文件，从而生成不同规格零件的实体模型来实现参数化的目的．根据零件在装配中的姿态造型，装配实质是对零件进行定位操作．产品的层次结构使装配过程限制在一定数量的装配对象范畴内，使自动装配的过程易于实现．参数化造型与自动拼装节省了大量的存储空间，免去产品设计人员的重复劳动，提高生产率     

曲面几何参数的实时识别与智能仿形系统

在曲面几何参数实时识别和密切曲率法的理论基础上提出了一种新的仿形系统，该系统的核心技术是曲面几何参数实时识别系统，由在端面上布有传感器点阵的盘形智能仿形头、曲面几何参数识别软件、仿形头姿态控制软件和姿态控制系统构成，仿形头姿态控制的原理是密切曲率法，由于几何参数识别系统可同时确定曲面上一点的坐标、法线向量、主曲率和主曲率的偏导数，故该技术既可用于高效率的实时五轴联动仿形加工，也可用于对三维实体模型进行高效率的数据采集，生成简捷的数学样条。该技术与ＣＡＤ／ＣＡＭ技术相结合，可以很方便地对实体模型进行修改，具有很好的柔性。     

Auto CAD R14的基于特征的三维实体建模

提出在ＡｕｔｏＣＡＤＲ１４版上进行实体模型构成的方法。基本出发点为：以物体的几何特征为基础，绘制三维实体模型，从而自动生成所需的二维视图     

复杂汽车锻件多工位成形的CAE分析

对利用三维刚塑性／刚粘塑性有限元分析复杂零件多工位体积成形的技术难点：三维速度奇异点的处理;三维模具几何信息的有效、精确、全面化描述;多工位成形时的信息传递;自由锻成形中特殊工艺三维有限元仿真的工步分解等进行了研究和解决．利用自行开发的三维体积成形仿真系统Ｆｏｒｍｉｎｇ３实现了对实际生产中未经简化的曲轴多工位成形过程的ＣＡＥ分析．从分析结果得到了曲轴多工位成形的金属流动规律,对合理制定其成形工艺作出了建议．     

基于AutoCAD Mechanical API实现零件多维信息的关联

提出一种以AutoCAD Mechanical为平台,利用零件参照的概念实现图纸中几何信息与非几何信息的关联,同时在此基础上利用ActiveX和DAO数据开发技术在参数化绘图中实现零件明细表的自动生成.     

一种新型的回转体零件参数化绘图技术

以ＡｕｔｏＣＡＤ为支持软件，借助ＡｕｔｏＬＩＳＰ丰富的逻辑运算功能，开发了一系列针对回转体类零件的绘图编程工具，实出了“自动编程”，打破了传统的参数化绘图方法，达到了简单、直观、明了的目的，以气波制冷机为例，对系统进行了实际运行，大大提高了设计效率。     

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。     

MasterCAM三维建模实例与分析

本文通过实例详细介绍了根据某零件二维图纸,利用三维绘图软件MasterCAM建立三维实体模型的完整过程,特别对于在建模过程中遇到的一些难点问题,进行了较详细的阐述。     

CAD在复杂刀具设计中的应用

本文介绍复杂刀具的计算机辅助设计（简称ＣＡＤ）方法．从蜗轮滚刀的计算程序与绘图程序入手，模拟工程技术人员设计蜗轮滚刀的全过程．所用研究方法与研制的程序，可应用到其他的机械设计中．本程序较多地采用子程序结构以优化设计．在输入被加工零件的原始参数后程序自动检索出合适的刀具结构参数和几何角度，自动进行刀具齿形的优化设计，最后绘出刀具的工作图．     

基于STEP的多功能梯度材料信息融合方法

基于STEP实体模型提出了一种融合多功能梯度材料信息与几何信息的方法．通过选择参考特征井指定材料分布函数，将材料信息添加到面、壳等几何实体中，从而实现材料信息与几何信息的融合。通过截面轮廓内部各点的材料值与点到参考特征的距离的映射，得到层内的材料分布信息，从而实现功能梯度材料零件模型的分层处理．     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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