计算机辅助减速机零件分类编码系统

介绍了为某减速机生产企业应用成组技术而开发的计算机辅助减速机零件分类编码系统，该系统是根据减速生产的具体要求而设计的多功用零件分类编码系统，它为成组技术的全面实施创造了良好条件。     

零件分类编码系统信息浅析

本文阐述了零件分类编码系统在成组技术中的重要性，并从编码分类系统的结构、信息源、译码机能等方面对常见的几种分类编码系统的信息进行分析。     

对成组生产组织中零件分组方式的探讨

成组技术是将工程技术与管理技术集于一体的生产组织管理方法．运用成组技术可使小批生产获得接近于大批生产的经济效果．在运用成组技术时，对零件的分组方法有两类，以生产流程分析为基础的分组方法及以零件分类编码系统为依据的分组方法．在实际应用中，应根据运用成组技术的目的对分组方法灵活应用．章以一个实际案例讨论了两种不同的分组方法，最后根据实际需求，采用了PFA方法进行分组．     

神经网络在成组技术方面的应用

阐述了成组技术及其在高级制造技术中的作用，在此基础上描述了神经网络在零件编码分类系统中的应用以及用神经网络设计制造单元的方法。     

面向产品标准化的齿轮分类编码系统

通过设计以成组技术相似性原理为基础的28位齿轮分类编码系统,获取齿轮产品关键技术特性,分析齿轮分类编码的结果,汇集相似结构工艺的零件组,形成齿轮产品标准。结合齿轮产品核心特征,并参照滚动轴承代号的排列顺序设计了11位产品标识码方案,在专业齿轮制造型企业推行齿轮产品标准化。采用Visual Basic6.0语言和SQL Server2000数据库技术开发出基于客户机/服务器(Client/Server)的计算机辅助齿轮分类编码系统并给出了一齿轮零件的编码实例。实际运用表明,该系统能有效地将齿轮产品编码分类成组,将具有相同分类代码的齿轮的技术特性汇总,有利于实现齿轮零件设计和生产的标准化,进而以大批量零件生产的方式改进多品种、中小批量生产的状况,最终在齿轮行业实现大规模定制的专业化标准生产模式。     

冷冲模凸模零件分类编码系统设计

应用成组技术对冷冲模凸模的特征进行了分析 ,采用特征代码设计了其零件分类编码系统。该设计具有一定的通用性 ,可扩展到冷冲模其它零部件 ,为冷冲模CAD提供了一种方法     

复杂零件派生式CAPP中若干关键问题

介绍了实施复杂零件成组技术及派生式CAPP系统的若干关键问题。指出用柔性编码系统对复杂零件进行编码描述,并将特征码位提前来简化应用。用特征位码域法确定了零件相似性标准,并划分了零件组。建立了复合零件以及成组工艺。建立了基于成组技术的派生式CAPP系统,指出这是符合我国国情的系统。     

在实施成组加工中零件的聚类成组

本文以国营红江机械厂二车间为具体对象讨论了在实施成组技术中零件分类归组问题。详细论述了采用编码分类法进行零件分类时,为了便于计算机识别,功能名称矩阵的设计原则,以及将生产流程分析法和编码分类法综合运用,反复修改,使分类结果更加合理,使同组零件既具有结构、形状、尺寸等相似性,又具有工艺过程相似性的具体方法。     

成组技术中面向对象的参数化模型

针对传统成组技术中的编码系统难以使用、编码不够精确和重用困难等问题,提出在成组技术中构造面向对象的参数化模型．该模型用类来描述零件簇,构成零件类的结构层次,生成零件描述的框架;用参数化方法从零件类实例化生成对象,以对象来表示具体的零件;查询时,以零件的特征和零件的具体参数来驱动,加速搜索的过程,并使结果更加精确;找到相同或相近零件对象后,在某个类层次上重用以前的设计．该模型的提出为成组技术的应用提供了新的途径．     

基于GT的过程机械快速设计系统的开发

过程机械的设计直接关系到产品的质量、成本和可靠性。在分析过程机械设计的特点和现状的基础上,运用成组技术构建了一个基于成组技术的过程机械快速设计系统,并且对开发过程中的零件分类方法、GT码的编制、编码检索与相似性判别以及三维设计系统的二次开发等关键技术进行了阐述。快速设计系统的使用可以缩短产品设计周期,使产品快速面市,提高产品的竞争力。     

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