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利用光学显微镜、X射线衍射仪和示差扫描量热法研究了IPP/PBT共混物的形态结构。结果表明,在IPP/PBT共混物中,当PBT含量少于20%时,IPP和PBT各自以晶粒的形式均匀地分布,属于Stein等人所提出的第一种模式。而当PBT含量大于20%时,共混物出现相分离现象。PBT的加入使IPP的结晶度下降,晶粒尺寸增大,熔点变低。 相似文献
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1 TIPA奖项概况由欧洲科技影像新闻协会 (TechnicalImagePressAssociation)主办的TIPA大奖 ,是目前全球最著名、最有影响力的摄影和影像产品奖项 ,是摄影和影像界的“奥斯卡金奖”。TIPA大奖评选已有十二年历史 ,先后进行过 2 1项评选 ,有 33家公司的近 130种产品获奖 ,所有获奖奖项及获奖产品列于附表中。附表 历年TIPA奖项及获奖产品奖项年份获奖产品 1991-1992康太时RTSⅢ1992 -1993佳能EOS 10 0最 1993-1994尼康F90佳 1994-1995美能达Dynax 70 0si单 1995 -1996美能… 相似文献
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GT应随着技术的进步而发展 总被引:2,自引:0,他引:2
吴锡英 《成组技术与生产现代化》1995,(3):10-12
生产的发展和市场竞争推动着制造技术的进步和新技术的不断涌现,从而对GT这个“旧”生产哲理提出如何进一步研究、应用和发展的问题,本文就此讨论了GT与建立报价系统、并行工程及面向对象设计的结合问题,以说明GT必然会,而且应该随着技术的进步而不断发展和应用。 相似文献
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压控充钠热管炉温度稳定性及复现性(节译)M·Gotoh日本东京大学K.D.Hill加拿大国家研究院ITS—90温标,使铂电阻温度计上限温度值从IPTS—68温标规定为630.74C延伸到961.78C,尽管为开发固/液相转变铜银共熔体做了许多努力,在... 相似文献
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聚氨酯/环氧树脂互穿网络聚合物相行为与粘接剪切性能的研究 总被引:6,自引:0,他引:6
制备了一系列聚氨酯/环氧树脂互穿聚合物网络PU/EPIPNs。由DSC、TMA和DDV研究表明,IPNs在高温区存在单一的玻璃化转变温度Tg,IPNs的相行为与其粘接剪切强度相关。并确认接枝共聚物的存在增强了IPNs的互穿效应 相似文献
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根据模型推导了主链运动忽略不计时的侧基多重内旋转运动的相关函数和谱密度函数,并用NMR研究了离聚体乳胶IPN(Io-LIPN)中PnBA侧基的^13C自旋-晶格驰豫时间T1。对测得的T1进行了拟合。结果表明离主链越远,Io-LIPN中聚丙烯酸丁酯的侧基基团内旋转运动速度越快。 相似文献
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基于虚拟企业生命周期的质量管理 总被引:5,自引:0,他引:5
阐述了虚拟企业生命周期理论,提出了基于虚拟企业全生命周期的质量环,对虚拟企业的生成期、运行期、发展期和终止期各阶段的质量管理问题进行了全过程的系统论述,认为虚拟企业的质量管理不仅是产品实现过程的质量管理,更是一个贯穿于虚拟企业生命周期的动态的系统管理过程。 相似文献
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面向并行工程的知识管理研究 总被引:8,自引:0,他引:8
知识经济和大规模定制等概念的提出,使得企业把知识财富作为获得竞争优势的战略要素来看待,企业知识管理由此受到学术界和企业界的共同关注。知识管理方法和工具集同并行工程现有方法和工具集的结合,产生了一个新的研究和应用领域,作者在跟踪国外研究和并行工程实践经验的基础上,对这一新兴领域的基本内容,实施方法和关键技术作了初步的讨论,以期引起国内学术界和企业界对该领域的关注,促进我国企业形成自己的核心竞争能力。 相似文献
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Design and manufacturing processes and their mutual interaction are reflected by the Manufacturing Engineering Reference Model. Information management, as the kernel of this reference model, encompasses structures that reflect the information. The three information structures that are discerned refer to products, resources and orders respectively. Originating from the demand for Concurrent Engineering, augmented effort is invested in the integration of the different processes applied in the manufacturing cycle of products. This paper discusses the integration of design and process planning-which is one of the main topics in Concurrent Engineering-along with the demand for Design for Manufacturing. Emphasis is on the application of production method knowledge and design support, especially for sheet metal parts. 相似文献
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计算机辅助检测规划是现代先进制造技术中不可缺少的重要构成部分,随着并行工程原理和协同求解技术的发展和广泛应用。开展并行工程环境下分布式协同求解技术在检测规划中的理论和应用研究是建立智能化、集成化、自动化先进制造系统的技术基础之一。本文针对检测规划的特点,提出基于三个层次结构的基本模型,形成了并行工程环境下计算机辅助检测规划的完整解决方案。 相似文献
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Individuals living with HIV experience a much higher risk of progression from latent M. tuberculosis infection to active tuberculosis (TB) disease relative to individuals with intact immune systems. A several-month daily course of a single drug during latent infection (i.e. isoniazid preventive therapy (IPT)) has proved in clinical trials to substantially reduce an HIV-infected individual''s risk of TB disease. As a result of these findings and ongoing studies, the World Health Organization has produced strong guidelines for implementing IPT on a community-wide scale for individuals with HIV at risk of TB disease. To date, there has been limited use of IPT at a community-wide level. In this paper, we present a new co-network model for HIV and TB co-epidemics to address questions about how the population-level impact of community-wide IPT may differ from the individual-level impact of IPT offered to selected individuals. In particular, we examine how the effect of clustering of contacts within high-TB incidence communities may affect the rates of re-infection with TB and how this clustering modifies the expected population-level effects of IPT. We find that populations with clustering of respiratory contacts experience aggregation of TB cases and high numbers of re-infection events. While, encouragingly, the overall population-level effects of community-wide IPT appear to be sustained regardless of network structure, we find that in populations where these contacts are highly clustered, there is dramatic heterogeneity in the impact of IPT: in some sub-regions of these populations, TB is nearly eliminated, while in others, repeated re-infection almost completely undermines the effect of IPT. Our findings imply that as IPT programmes are brought to scale, we should expect local heterogeneity of effectiveness as a result of the complex patterns of disease transmission within communities. 相似文献
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