Some remarks and proposals concerning the planning and performance of technology assessment studies

It is the authors' intention to clarify some basic problems of technology assessment studies and some apparent misunderstandings about the role and possibilities of technology assessment. The discussion centers around questions such as the following: Can technology assessment studies be objective in the scientific sense? What are the risks that may result from a lack of active participation of affected groups in the assessment process? Do technology assessment studies really produce evaluations of the future impacts of a technology according to future value systems? Are the frameworks or schemes for the technology assessment process that are proposed by a number of analysts really helpful for the conception of adequate pragmatic strategies in concrete cases? Should the European countries imitate the US example of setting up an Office of Technology Assessment in the legislature?The authors believe that technology assessment analyses should be organized as transparent, participatory, and argumentative processes and that procedures should be developed and applied that are suitable to fulfil this task.     

The selection and treatment of alloy steels for automobiles

This paper treats of the various kinds of alloy steels and their applications in the automobile industry. Attention is called to the necessity of selecting steels which will do most efficiently the particular work for which they are intended.     

锻钢增建1#加热炉的设计与使用

通过新增建１＃加热炉,解决了锻钢高合金钢和大规格锻材生产能力不足的问题,达到高效、优质、节能的目的。     

浅谈钛在海水冷却换热器中的应用优势

海水容易对传统的换热器产生腐蚀作用,缩短设备的使用寿命。长时间的腐蚀,不仅增加设备维护工作,造成经济损失,而且容易造成设备漏泄,产生安全事故,具有极大的安全隐患,寻找一种适当的材质,从源头上防止海水腐蚀势在必行。通过大量的研究,钛因其具有的特殊性能从众多的材质中脱颖而出,成为海水冷却换热器的首选。     

On rectangular systems of differential equations and their application to circuit theory

A system of differential equations A(d/dt) x = Bx+f, along with the initial condition x(0) = k, is considered where A and B are m x n matrices. Generalized inverses of the matrix A are used to derive algebraic conditions for the existence and uniqueness of a solution. An example is presented to illustrate application of the results to circuit theory.     

多层轻型房屋钢结构的设计与应用研究

近年来，钢结构在各种工业与民用建筑中广泛的使用，为推动轻型钢房屋建筑起到了积极的作用。但同时在多层轻型房屋钢结构的设计应用中也存在一些问题。该文阐述了多层轻钢结构住宅常用的结构体系及主要构件的设计，对目前存在的问题作了一定的探讨并指出发展方向。     

Multiple summation inequalities and their application to stability analysis of discrete-time delay systems

This paper is devoted to stability analysis of discrete-time delay systems based on a set of Lyapunov–Krasovskii functionals. New multiple summation inequalities are derived that involve the famous discrete Jensen?s and Wirtinger?s inequalities, as well as the recently presented inequalities for single and double summation in [16]. The present paper aims at showing that the proposed set of sufficient stability conditions can be arranged into a bidirectional hierarchy of LMIs establishing a rigorous theoretical basis for the comparison of conservatism of the investigated methods. Numerical examples illustrate the efficiency of the method.