客家土楼中的象征文化浅析

客家土楼以其鲜明的风格成为世界建筑艺术的一朵奇葩,其中蕴含着丰富的象征文化.试从象征的源起及在建筑中的具体体现等方面,对客家土楼中的象征文化进行诠释.通过研究其中的象征文化,有助于更完整地认识客家土楼建筑文化的全部涵义.     

工程造价的管理和控制

讨论了建设项目在投资决策阶段、设计阶段、招投标阶段和项目实施阶段以及竣工结算阶段实行全过程的管理方法：以主动控制为主要手段结合被动控制，把建设项目的投资控制在批准的投资限额内，保证项目管理目标的实现。力求以最少的人力、物力、财力，保质、保量、按期完成任务，取得较好的投资效益。     

A review of modeling approaches for oriented semi-crystalline polymers

Modeling changes in the physical properties of oriented semi-crystalline polymer films is beneficial for understanding the fundamentals associated with structure property relationships and could be used for developing new polymer films with significantly enhanced physical properties. Relating the molecular changes observed in oriented polymer films to inherent polymer characteristics provides valuable insight for the development of new polymers which exhibit enhanced physical properties upon orientation. Modeling efforts will be reviewed that have attempted to use fiber composite theory to explain the transitions seen during the orientation process.     

Numerical investigation on the heat transfer characteristics of a liquid-metal pool subjected to a partial solidification process

The main purpose of this paper is to investigate numerically the effects of solidification on the heat transfer characteristics of the liquid metal layer, for use in accident analyses. The situation is very similar to an overlying liquid melt pool that could be fooned in the reactor lower head during the late phase of a severe nuclear accident. Based on a computational model, MPCOOL, the numerical predictions were then assessed through a comparison with the experimental data that was obtained with various boundary temperature conditions and geometrical aspect ratios, especially for the Ra-Nu relationship. For the cases with solidification, the results of the comparison show that(a) the computational model does show a good agreement with heat transter rates inferred from the experimental data, with a few exceptions at the Ra numbers which suggest a turbulent transport; and also (b) the computational model underpredicts the heat transfer rates by about 6% than that inferred from the experimental data when it is integrally evaluated with the Ra-Nu correlation. The foregoing results are mainly due to the currently limited applicability of the computational model up to the laminar-to-turbulence transition flows and its application to the turbulence flows because it is always subjected to a model uncertainty between the laminar and turbulence. Next, an additional comparison for the cases with and without solidification was made to examine the effects of the solidification on the energy partition within the liquid metal layer and its effects on the directional heat transfer rates. The results of the comparison show that the computational model for the case without solidification predicts higher heat transfer rates by about 15% than when solidification is included, but there isn't any experimental data that directly supports this trend.     

墙体改革·生态环境·居住质量

结合可持续发展思想,简述了墙体改革的必要性、重要性和紧迫性     

关于住宅坡屋顶的思考

对近几年各城市住宅建设中出现的坡屋顶热进行了分析,认为住宅设计中采用坡屋顶有其客观必然性和现实意义;⑴美化住宅造型,改善城市景观形象;⑵提高住宅屋顶的防水性能,增强住宅商品的耐久性;⑶有较好的保温隔热能力,利于建筑节能;⑷带动新型建材产业的发展。对住宅设计中采用坡屋顶形式、改善住宅整体功能和美化城市形象、实现人居环境的可持续发展等提出4点建议和意见。     

韶钢大转炉工程箱形钢结构制作

韶钢大转炉工程主厂房钢结构的关键是箱形钢结构的制作，其质量要求高、制作难度大，焊接变形控制是制作过程中的主要施工难点．文章阐述塔楼箱形钢结构的制作工艺，通过精心控制组对精度及焊接变形，确保了整个箱形结构的尺寸精度，为大型箱形钢结构的制作提供了成功的经验。     

高层建筑玻璃幕墙设计方法评述

本文全面而系统地评述了高层建筑玻璃幕墙设计方法在国内外的研究进展情况，介绍了几种用于工程实践的实用设计方法，并对今后的研究工作提出建议。     

Nonlinear averaging theorems, and the determination of parameter convergence rates in adaptive control

The paper presents nonlinear averaging theorems for two-time scale systems, where the dynamics of the fast system are allowed to vary with the slow system. The results are applied to the Narendra-Valavani adaptive control algorithm, and estimates of the parameter convergence rates are obtained which do not rely on a linearization of the system around the equilibrium, and therefore are valid in a larger region in the parameter space.     

利用运行点和边界值条件简化模型的方法

一个高阶模型G(S)=K_0/(TS 1)~n可以在运行状态及边界条件下通过拟合,简化成确定性模型C_τ(S)=(?)或不确定性模型(?)文中研究这种模型简化原理和方法.仿真试 验表明:这种方法可以广泛应用于仪表及其系统分析与设计.