Combining Results From Multiple Evaluations of the Same Measurand

According to the Guide to the Expression of Uncertainty in Measurement (GUM), a result of measurement consists of a measured value together with its associated standard uncertainty. The measured value and the standard uncertainty are interpreted as the expected value and the standard deviation of a state-of-knowledge probability distribution attributed to the measurand. We discuss the term metrological compatibility introduced by the International Vocabulary of Metrology, third edition (VIM3) for lack of significant differences between two or more results of measurement for the same measurand. Sometimes a combined result of measurement from multiple evaluations of the same measurand is needed. We propose an approach for determining a combined result which is metrologically compatible with the contributing results.     

α-olefin oligomers and polymers with metallocene catalysts

Metallocenes offer new synthetic routes to olefin oligomers and polymers covering a wide range of molecular weights and melting points. This paper deals with some important features of the preparation of oligomers, wax-like polymers as well as highmolecular-weight polymers via metallocene catalysis. Taking the oligomerization of hexene as an example, a simple kinetic scheme is established, which is suitable to describe the course of the reaction and the resulting oligomer distribution with metallocenes as catalysts. For low and high-molecular-weight polymers, the metallocene route to polypropylene is compared to existent processes in terms of reaction conditions and product properties. An attempt is made to separate the effect of different chain defects like chain ends, regioirregularities and comonomers on the melting point.     

DFT时代的ATE结构--多端口ATE

在单颗硅芯片上设计更多系统功能(SOC)的趋势,增加了IC的开发与制造测试的复杂度。未来对于较高速度与较多管脚数的需求,将使传统的自动化测试仪器(ATE)变得非常昂贵。为了减轻开发工作的负担及降低制造测试的成本,不得不寻求知识产权(IP)的再利用与可测试性设计(DFT)技术。本文介绍一种新的多端口ATE结构,它是为基于IP的测试开发与执行而设计的。这种结构提供刚好足够的能力来测试芯片,以降低ATE的资本成本,并广泛使用平行测试来提高产能。     

Bridging lean to agile production logistics using autonomous carriers in pull flow

Since the early 90s the lean manufacturing system has become popular for industries. Following that, agility in production has received great attention. Exploration of any new techniques for bringing these strategic concepts closer to each other has become advantageous for pioneer industries. Accordingly, the new paradigm of individual control, with the progressive interpretation of ‘autonomy’, can contribute to the objectives of the lean and the agile concepts in production and logistics environments. To explain the contributions of the addressed thesis the study describes it in theoretical and empirical forms. The compatibility of these leading-edge concepts to realise the notion of continuous material flow through supply chains and production floors is examined. Simultaneously, the factors of efficiency, effectiveness and responsiveness are considered. This study covers a quick review on the lean and agility techniques and highlights some specific contributions of autonomous control to their targets. The purpose is to clarify the role of the autonomy in compliance with the lean and agility goals. This is inspected through development of a discrete event simulation with some scenarios in a supply network.