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1.
“独立制造岛”是以成组技术的为基础,数控机床为核心,数控机床与普通机床并存,强调信息流的自动化,以软取胜和以“人”为中心的生产方式。它的特征是组织、人员和技术三者的有机集成,面向车间,权力下放,综合治疗,并以获取经济效益的主要目标.可以认为,它是一种适合中国情的、面向21世纪的、可持续发展的新生产模式。  相似文献   

2.
“独立制造岛”是以成组技术为基础,数控机床为核心,数控机床与普通机床并存,强调信息流的自动化,以软取胜和以“人”为中心的生产方式.它的特征是组织、人员和技术三者的有机集成.面向车间,权力下放,综合治理.并以获取经济效益为主要目标.可以认为,它是一种适合中国国情的、面向21世纪的、可持续发展的新生产模式  相似文献   

3.
分析计算机辅助制造高级发展阶段的基本特征,明确制造业面临的新问题。并回顾制造业的历史,重新认识现阶段制造业与人、环境之间的关系。提出适应计算机辅助制造高级发展阶段特征和解决制造业与人、环境之间三大矛盾的虚拟制造系统的制造哲理观。  相似文献   

4.
计算机集成制造系统(CIMS)是对国家经济发展有重大影响的技术,它是一种组织、管理与运行企业生产的现代制造系统,是基于现代管理技术、制造技术、信息技术、自动化技术、系统工程技术的一门综合技术。它以计算机网络和数据库为基础,利用计算机软硬件将制造企业的经营、管理、计划、产品设计、加工制造、销售及服务等全部生产活动集成起来,  相似文献   

5.
刘芝 《科技潮》1994,(5):25-26
制造业是为社会创造财富和为科学技术发展提供先进手段的基础性产业。它直接反映一个国家的生产力水平和经济发展水平,直接关系着传统工业的改造、新兴工业的发展以及科学技术的进步。 70年代中期以来,高技术在制造业中得到了广泛的应用,使传统模式的制造业向自动化、集成化和智能化的方向发展。在现阶段,计算机集成制造(CIM)是这种趋势的集中表现,发达国家都以在本世纪末或下世纪初,实现计算机集成制造,即实现机器制  相似文献   

6.
为了定量评价产品设计制造环节信息流结构的有序性,建立了产品设计制造环节信息流结构的有序度和结构熵模型,在此基础上,计算了设计与制造环节信息流结构的时效熵和质量熵,定量分析了一种仿人型机器人左腿模型的设计与制造环节两者之间的信息流结构有序性,为分析产品设计与制造环节之间信息的演化提供了依据。  相似文献   

7.
杨景宜 《科技潮》1998,(10):94-95
北京第一机床厂CIMS工程,作为国家863/CIMS应用于工厂的突破口项目,于1994年6月通过验收,初步建成了集成工程设计分系统、管理信息分系统、制造自动化分系统,并从信息流与物流的集成上打通了一条加工箱体的柔性制造线。该项目在CIMS信息集成上达到国际领  相似文献   

8.
现有制造企业生产组织管理模式与信息技术应用存在较多不适应之处 ,但这种现状又难以在短时间得到改变 ,如何在维持现有模式条件下 ,实施企业信息化改造 ,是一个急需解决的课题。因此 ,在分析企业产品形成过程的组织管理和信息流基础上 ,提出面向过程的制造网络构建策略 ,结合国内企业生产特点 ,在不改变企业组织管理模式前提下 ,实现了制造系统网络化。  相似文献   

9.
基于动态制造资源数据库的工艺设计模型研究   总被引:11,自引:0,他引:11  
构造了“基于动态制造资源数据库的自动工艺设计模型”,并进行了有益的研究与实践,讨论了适合计算机求解的工艺设计一般方法,介绍了动态制造资源数据库的构成,阐述了以制造资源为动态导向,实现工艺设计自动化的意义及方法。  相似文献   

10.
计算机集成制造哲理及其在企业信息化建设中的应用   总被引:1,自引:0,他引:1  
介绍计算机集成制造和计算机集成制造系统 ,指出当前企业信息化建设中应当注意的若干问题 ,给出广西柳工机械股份有限公司的计算机集成制造系统应用工程的例子。  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
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。  相似文献   

14.
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.  相似文献   

15.
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-  相似文献   

16.
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-  相似文献   

17.
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  相似文献   

18.
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  相似文献   

19.
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  相似文献   

20.
<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  相似文献   

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