从岭南粤园项目探究岭南园林在当代的发展

首先分析岭南园林的两大重要特征,即＂围而不闭、兼容并蓄＂,并阐述和研究如何把它们运用到岭南粤园项目的规划和建筑设计中,同时探讨岭南园林在当代的延续和发展之路。     

世界非常规天然气资源及其利用概况

随着世界各国对能源需求的不断增长,非常规天然气资源及其利用越来越受到重视。文章评述了世界一些国家如美国、加拿大、印度非常规天然气资源及其利用情况,详细叙述了中国煤层气资源现状及发展情况。认为非常规天然气资源尤其是煤层气在中国有广阔的发展前景。     

上海世博会中国馆的广播系统建设

介绍了世博会中国国家馆广播系统的架构和功能应用，论述了网络型广播系统的应用及大空间扬声器的选型要求和对声音的数字化处理。     

“世界城市”论说综述

本文通过综述国际上著名学者对有关“世界城市”理论的论说,阐述了这一理论的演变过程及其内涵,以期对国内理论界和城市规划界提供借鉴。     

鄂尔多斯市水土保持世行贷款二期项目效益分析

内蒙古自治区鄂尔多斯市水土保持世行贷款二期项目实施期为5年.截至2004年底,全项目区累计完成综合治理面积50581.18hm2,占总计划任务的100%.项目区水土流失治理程度由19.89%提高到69.62%,人均收入由758元提高到3360元,显示出显著的经济、社会、生态效益.     

8000kN闭式冷精锻设备及模具的研制与应用

在分析了国内外现有闭式冷精锻装备的优缺点的基础上,开发研制了数控精锻液压机和液压传动凹模模具装置,构成闭式冷精锻设备,实现了圆锥齿轮等轿车关键零件的精密模锻生产.实践表明,设备运行稳定,工作可靠,投资少,见效快,具有重要的推广应用价值.     

创建世行贷款项目管理新模式--内蒙古自治区黄土高原水土保持世行贷款项目建设概述

内蒙古黄土高原水土保持世行贷款项目自1994年实施以来,坚持人工治理与生态自我修复相结合,管护与治理相结合,并严格落实产权制度,建立还贷机制,使责、权、利明确,走出了一条水土保持生态建设的新路子.     

Incorporating Environmental Degradation in Closed Form Adhesive Joint Stress Analyses

A review of the literature reveals that although the effects of environmental degradation have been incorporated into some recent finite element stress analyses of adhesive joints, closed form solutions have not yet been developed. Due to its ease of use, such a closed form approach would be very useful for screening analyses of potential joint configurations. Two different closed form approaches have been developed. Both use simple, yet demonstrably reasonable, assumptions about the affect of moisture on the mechanical properties of the adhesive and both use a Fickian diffusion model to determine moisture distribution in the joint. The simplest approach is based on limit state assumptions and results in a simple non-dimensionalised equation relating residual strength to the time of exposure. The equation is in the form of an infinite series and is also presented as a design chart for even easier access. The second approach is the adaptation of a generalised non-linear adhesive sandwich analysis. The advantage of this is that it is applicable to a wide range of bonded joints and not just the single lap joint in the closed form solution. Further, it is not limited by limit state assumptions and gives the adhesive peel and shear stress distribution for any loading condition and exposure time. Both approaches were illustrated by the application to a typical single lap joint, exposed at 85% RH for 230 days.     

Thin-walled steel columns with partially closed cross-section: Tests and computer simulations

Cold formed sections can be optimized for different purposes and they are fairly inexpensive to produce in small series. They have an inherent weakness in their small torsional stiffness, which is unfavourable for columns. One solution presented here is to make a closed section by adding a thin cover plate connected discretely with self-tapping screws. It is here called a partially closed cross-section because it is not continuously and rigidly connected. The aim of this paper is to evaluate the efficiency of this solution by comparing the behaviour of partially closed and open cross-section. Four columns were tested within the project, two of them with centric axial load and two with eccentricities. Numerical analysis was performed using ABAQUS for establishing the influence of the cover plate on the critical load and the resistance. A good agreement between non-linear FEM and experiments were found. After this verification of the FE model a parametric study was carried out. Results of experiments and numerical analysis were compared with the predicted resistance by Eurocode 3, Part 1–3, and the Direct Strength Method. Both design methods give good predictions of the resistance.