AutoCAD书写字符管理功能分析与存在问题探讨

本文简要分析了通用绘图软件ＡｕｔｏＣＡＤ书写字的操作结构与数据结构，对ＡｕｔｏＣＡＤ在实际应用中书写字符管理功能的某些不足之处，进行了一些探讨，并提出了改进方法。     

AutoCAD在工程设计中几个关键问题的处理

结合计算机绘图的实践，论述了ＡｕｔｏＣＡＤ软件的特点和提高工程图的计算机绘图质量及速度的几个关键问题，对ＡｕｔｏＣＡＤ的广泛应用于工程实际问题进行了分析讨论。     

基于VBA的参数化图库

ＡｕｔｏＣＡＤ　２０００是目前最流行的通用绘图软件,但没有针对专业用户的图库,不具备设计计算能力。为此,利用其内嵌的ＶＢＡ开发工具,用参数化设计和绘图的方法开发了用于机械设计及绘图的标准件、常用件图库。该图库极大的提高了用ＡｕｔｏＣＡＤ软件进行机械设计、绘图的效率,增强了ＡｕｔｏＣＡＤ的功能。并用实例介绍了开发步骤及过程,仿此能进行其它专业的参数化图库的开发。     

Auto CAD DXF文件C语言函数库的研制

介绍了ＡｕｔｏＣＡＤ参数化绘图和ＤＸＦ文件Ｃ语言函数库的研制过程,以及该函数库的使用方法：给出了ＡｕｔｏＣＡＤ参数化绘图的实例。     

计算机绘图教学及软件使用中的几个问题

讨论了ＡｕｔｏＣＡＤ常用命令及实用功能的灵活运用，以提高绘图质量和效率，并介绍了教学上的具体作法，以及ＡｕｔｏＣＡＤ常见问题的解决办法．     

基于AutoCAD ASI的弹簧绘图与管理

介绍利用绘图软件ＡｕｔｏＣＡＤ的Ｃ语言开发系统ＡＤＳ（ＡｕｔｏＣＡＤＤｅｖｅｌｏｐｍｅｎｔＳｙｓ－ｔｅｍ）和数据库接口ＡＳＩ（ＡｕｔｏＣＡＤＳＱＬＩｎｔｅｒｆａｃｅ）开发出的弹簧绘图和管理模块,该模块利用数据库技术,开发方法体现了现代ＣＡＤ的技术思想,具有直观、方便和实用的特点．     

一个实用的分形CAD系统设计

将分形Ｌ—系统与ＡｕｔｏＣＡＤ相结合,使之从单纯的图形算法进入到实际的设计系统中,同时也扩展了ＡｕｔｏＣＡＤ的绘图功能．文中给出了具体实现过程及图例     

参数化绘图的一种新方法——鼠标拖动

该文用ＡｕｔｏＣＡＤ提供的Ａｕｔｏｌｉｓｐ语言进行二次开发，修改、扩充Ａｕｔｏ－ＣＡＤ的功能；用Ａｕｔｏｌｉｓｐ语言提供的（ＧＲＲＥＡＤ［〈ｔｒａｃｋ〉］）函数，让用户直接读ＡｕｔｏＣＡＤ的输入设备（如鼠标），任选项追踪光标移动存在且为真时，通过鼠标移动光标，达到从鼠标那里不断返回坐标值，实现鼠标拖动实体数据库与屏幕图形的一致变更，深化ＡｕｔｏＣＡＤ的作图环境，使鼠标拖动图形的参数化绘图成为可能     

TBAuto软件包的研制及在复杂刀具CAD中的应用

在刀具设计的ＣＡＤ中；目前存在的主要问题是高级程序语言与绘图软件间的信息传递。本文在完成某工具厂具体 ＣＡＤ项目的基础上，研究开发了实用性较强的ＴＢＡｕｔｏ绘图软件包，解决了 ＴＲＵＥ ＢＡＳＩＣ语言与 Ａｕｔｏ ＣＡＤ之间的信息传递问题。文中介绍了复杂刀具结构设计，图表、曲线的优化检索方法，比例绘图技巧及软件包的主要功能等．该软件包简单易学，使用方便．可以解决较复杂的绘图问题，提高设计效率２０～３０倍，为开发类似的软件奠定了基础．     

微机绘图系统AutoCAD与高级语言及数据库的联接与通信

该文讨论了微机绘图系统ＡｕｔｏＣＡＤ的接口技术，并详细分析了ＡｕｔｏＣＡＤ系统中的ＤＸＦ文件、ＳＣＲ文件、ＤＷＧ文件、ＴＸＴ文件、ＡｕｔｏＬＩＳＰ语言以及不需要中间文件的ＡＤＳ等接口形式和实际中的应用。该文用４个简洁的图示表达出各个接口在ＡｕｔｏＣＡＤ绘图系统与高级语言及数据库之间的重要的联接作用；叙述了如何进行接口程序设计，并提出解决设计过程中出现的某些问题的方法。文末，就每个接口类型的应用条件及选择做了分析和比较     

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.     

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     

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

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