钢丝网砼墙板结构分析和设计

针对新型钢丝网砼墙板出现的强度问题,采用有限元分析方法,分析了墙板干收缩值、钢丝网布置的密度和方式以及墙体所受约束对墙板应力水平的影响,指出了导致墙板开裂的主要原因是砼的干收缩值偏高,提出了三种降低应力水平设计方案,并进行了修正方案的计算和实验验证.据此修改后设计的墙板被证明具有较强的抗裂能力,同时表明了所提出的有限元分析方法的工程实用性.     

T31—环氧树脂固化体系研究：Ⅲ.激光测微法测线膨胀系数

用自己组装的能测量达纳米量级微小位移的激光测微装置测定了不同固化剂Ｔ３１－环氧树脂体系的线膨胀系数，并由膨胀系数的转折来求取该固化体系的玻璃化温度随Ｔ３１含量的变化。实验表明，Ｔ３１固化剂确是低膨胀系数的良好固化剂。     

短消息系统未来网络建设趋势

论述了短消息在国内外的发展现状及短消息的服务功能,分析了中国移动的“移动梦网”计划,并阐述了短消息系统网络的发展趋势和前景。     

Investigating hair properties relevant for hair 'handle'. Part I: hair diameter, bending and frictional properties

The expert working group 'Hair Care Products' of the DGK currently conducts a wide study to contribute to the understanding of how single hair fibre and hair collective properties contribute towards hair 'handle' and 'feel'. During the first stage of this study four hair types were selected from a large group of individual European hair braids, according to either similar or widely different panel ratings for handle. Against the background of the panel test and the state of the literature the working group readily identified the bending properties of single fibres interacting in the tress as a fibre collective and fibre friction as being of central relevance for hair 'handle' and 'feel'. Fibre diameters of the hair types were determined by Optical Fibre Diameter Analyzer and by weighing. From these data mean ellipticity and bending stiffness distributions were calculated. Single fibre friction was determined by the capstan method in the root, middle and tip regions. Significant differences were determined between the hair types in diameters, ellipticity, bending stiffness and friction. The results lead to conclude that 'handle' is perceived as inferior when the hair is thick and bending stiffness thus high. For such hair differences in handle rating are related to differences in friction, namely in the tip region. For thin and thus 'soft' hair fibre friction seems to play only a minor role.     

From Product to Process: Building on Urban-Think Tank’s Approach to the Informal City

Adriana Navarro-Sertich interviews a pioneer of the informal in architecture, co-founder and co-director of Urban-Think Tank (U-TT) Alfredo Brillembourg . Brillembourg explains how U-TT's work seeks to connect informal settlements with the formal city, enabling inhabitants to access services and infrastructure. U-TT is now taking the lessons it has learnt in working in Latin American cities, such as Caracas and São Paulo, elsewhere in the world with the aim of ‘working globally and acting locally’. Copyright © 2011 John Wiley & Sons, Ltd.