街面水电站混凝土面板堆石坝主要技术问题探讨

街面水电站拦河坝为混凝土面板堆石坝,在面板止水结构型式、面板防裂措施、上游面的施工方法、趾板开挖处理及趾板灌浆等方面,根据工程实际情况,结合国内外的新技术新工艺进行了探讨。     

Crushing behaviour of the energy absorbing 'tensor skin' panels

ABSTRACT Research results concerning the simulation of the crushing behaviour of composite systems with energy absorption characteristics are presented in the present work. The study is focused on the ‘tensor skin’ concept, an energy absorbing composite system that was originally developed to improve the crashworthiness of helicopters under water impact and which is promising for utilization in the construction of the lower part of composite fuselage aircraft. The ‘tensor skin’ concept comprises a folded or corrugated composite construction, which upon loading unfolds by forming ‘plastic hinges’, leading to an increase in the load bearing capability of the structure. The numerical modelling issues and the critical aspects of the simulation are discussed. Verification of the numerical simulation procedure is performed by experimental work. The experimental results utilized to assess and validate the numerical procedure were derived within the European Research Project ‘Design for Crash Survivability – CRASURV’ (BRITE – Aeronautics Area). The results of the simulations are generally in good agreement with experimental data.     

金刚烷最新研究

金刚烷是近 30年来发展起来的一种新型精细化工原料。简要介绍了金刚烷的分子结构、性质及其主要用途 ,重点对近年来国内外报道过的金刚烷合成方法进行了评述 ,在此基础上指出了金刚烷化工的未来发展趋势。     

激光武器对抗效能指标体系研究

武器系统的效能是规划、研制、配置和部署武器系统的基本依据,是评价武器系统优劣最重要的综合性指标,建立正确的效能指标体系是进行效能分析与评价的前提。在详细研究了激光武器对抗机理、效能指标选用原则的基础上,构建了相对完整的激光武器对抗效能指标体系结构,并提出了在不同作战任务下量度激光武器对抗能力的效能定义。     

鞍钢现有人造富矿产能及1600万t/a生铁规模的合理炉料结构的探讨

简要介绍了鞍钢现有人造富矿生产能力，分析了鞍钢生产1600万t／a生铁所需要的炉料数量、品种和质量，并提出了解决炉料缺口的方法和措施。     

Model of Primary Austenite Dendrite Structure in Hypoeutectic Cast Iron

Ｉｔｗａｓｒｅｐｏｒｔｅｄ[1] ｔｈａｔｔｈｅｍｉｃｒｏ ｓｔｅｒｅｏｓｔｒｕｃｔｕｒｅｏｆｐｒｉｍａｒｙａｕｓｔｅｎｉｔｅｉｎｃａｓｔｉｒｏｎｃｏｎｓｉｓｔｓｏｆｐｒｉｍａｒｙｓｔｅｍｓａｎｄｓｅｃｏｎｄａｒｙａｒｍｓｔｈａｔ ｇｒｏｗａｃｃｏｒｄｉｎｇｔｏｄｅｎｄｒｉｔｅｃｒｙｓｔａｌｓｂｒａｎｃｈｒｕｌｅ ,ａｎｄｓｏｍｅｏｆｐｒｉｍａｒｙａｕｓｔｅｎｉｔｅｅｖｅｎｈａｖｅｔｈｉｒｄａｒｍｓ .ＭｉｙａｋｅＨｅｔａｌ[2 ]ｐｒｏｐｏｓｅｄａｃｏｎｃｅｐｔｏｆｒｅｇｉｏｎｍｏｄｅｌｂｙｓｔｕｄｙｉｎｇ…     

Evolution of grain structure in thin film reactions

In this paper, we examine, both experimentally and theoretically, the kinetics of formation and microstructure of product phases in thin film reactions, using the Nb/Al and Ti/Al systems as our prototypes. The results of calorimetry and microscopy studies are interpreted using simple kinetic and morphology models. In particular, the kinetic models employed here focus on the nucleation and growth components of the phase formation process and the morphology models provide a starting point for the classification of product grain structures. An erratum to this article is available at .     

一种三叉树的存储结构及其基本操作的实现

本文在文献［１］所给出的有关三叉树有其相关概念的基础上，提出了一种新的三叉树存储结构，即“儿子－兄弟链表”方法，并在这种结构下，对三叉树的基本操作的实现算法进行了较详细的讨论。