基于CAXA确定零件数控编程基点坐标的图解法

文章提出了用CAXA确定零件数控编程基点坐标的图解方法,通过实例介绍了该方法的操作步骤。同联立方程组法和三角函数法相比较,该方法不仅具有同样的高精度,而且更具有直观、快捷和简便的显著优点。     

数控机床零件源程序数控编程的插弧问题

本文提出了用计算机辅助编程的方法对数控机床零件源程序中零件轨迹尖角或小圆角处进行插弧编程的问题，并从方便用户的角度使用了现代的模块设计方法对该问题进行编程。该程序可用于两维半或多维数控机床的数控编程。     

数控车削加工中宏程序运用初探

数控编程分为手工编程与自动编程两种．自动编程软件种类繁多、功能齐全，在数控编程领域应用很广泛．虽然如此，手工编程仍然占有很重要的地位，是编程的基础，要求从业人员必须掌握．用软件生成的程序往往很长，不易检查，用宏程序编程则可以避免这种现象，使程序变得简单，并且通过改动相关参数，能够适用于不同尺寸的工件．以椭圆为例，介绍宏程序的编写方法．     

FBT线圈平绕机的自动编程系统

介绍了FBT线圈平绕的工艺特点和控制参数。阐述了PX6080数控手绕机的自动编程系统，其中包括用户接口、走线轨迹编辑和编程语言系统。实际应用结果表明，该自动编程系统比人工编程提高工作效率几十倍，且运行可靠。     

新型的计算机数控切割机辅助编程系统

介绍的是作者针对某厂数控切割机自动编程的改进而提出的新型的辅助编程系统，文章首先对我国数控自动编程系统的现状进行了分析，接着提出改装方案，最后对新实现的新型的数摈 切割机辅助编程系统的功能和特点进行了详细论述，本系统将对促进我国的数控切割计算机编程系统的向前发展将产生积极的作用。     

数控模拟仿真软件在实验教学中的应用

在数控编程课程教学中，应用数控仿真软件，有利于改善目前该课程教学、实践环节效果不理想、效率低、不安全的现象，并且有利于提高学生数控编程能力和数控机床的操作能力。通过实践，教学效果良好。     

新机尾桨叶压模的加工工艺及数控加工

本文通过对尾桨叶压模这一工装的材质、制造要求加以阐述，对影响到工件加工质量和效率的工艺路线、技术准备、数控编程、加工细节等各种因素综合考虑，针对该模具加工时应考虑的工序的划分、毛坯的选择、加工路径的确定、以及刀具、切削参数的选用等常见问题加以分析，结合以往的加工经验，拿出了具体的加工方案、加工前的准备事项，及数控编程的策略选择、刀具选择，加工参数等。     

雕塑曲面数控粗加工刀位规划

提出了一种新的直接从测量数据中生成粗加工刀位轨迹的方法，被加工曲面用多面体模型来描述，采用分层切削方法进行加工．在各切削层分别用一个参考平面与毛坯和曲面模型求交，根据各相交环之间的位置关系，求出有效加工区域，利用数控编程自动生成粗加工刀具轨迹，并进行干涉检查和修正．计算实例表明，该算法稳定、效率高，尤其适用于加工带多重岛屿的复杂曲面．     

数控铣床数控加工图形编程的设计

论述了基于AutoCAD的数控铣床数控加工图形编程系统的设计问题．数控铣床图形编程系统的设计是通过DXF文件，并加入加工工艺信息等，可以自动地生成ISO标准代码的数控加工程序；在此基础上，图形编程系统可以进行加工过程模拟，NC代码检验．     

数控技术在机械加工中的应用

数控技术在机械加工中的应用越来越广泛,本文对数控加工中编程方法、编程步骤做了分析,并通过具有代表性的实例详细的分析了,解析整个数控车编程中的难点和问题。     

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

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