双向超长转换结构设计

本文通过对超长建筑无缝设计的意义的论述,对一个实际工程双向超长转换结构的转换形式进行了分析,对整体结构和转换梁进行了理论设计计算,最后提出了超长转换结构的主要构造措施,可供同行设计参考。     

Selective adsorption of p-chloronitrobenzene from aqueous mixture of p-chloronitrobenzene and o-chloronitrobenzene using HZSM-5 zeolite

The selective adsorption of p-chloronitrobenzene (p-CNB) using zeolite as the adsorbent from an aqueous mixture containing p-CNB and o-chloronitrobenzene (o-CNB) was investigated. The maximum adsorption amounts of p-CNB in HZSM-5 zeolite were found to be approximately 4 molecules per unit cell (mol/uc) at all adsorption temperatures investigated. The maximum adsorption amounts of o-CNB in HZSM-5 zeolite were, however, markedly lower than those of p-CNB at different adsorption temperatures. Diffusion results revealed that the diffusivity of p-CNB at 300K was about 100 times higher than that of o-CNB in HZSM-5 zeolite. The remarkable difference in the adsorption amounts and diffusivities between p-CNB and o-CNB resulted in separation factors of 463.6, 96.8 and 21.9 for p-CNB at 278, 300 and 323 K, respectively, indicating a selective adsorption of p-CNB in HZSM-5 zeolite from the aqueous mixture of p- and o-CNB.     

地域性区段建筑空间环境的有机再生技术研究

地域性区段的建筑空间环境是时间和空间共同作用下的有机整体,由于种种机缘,这个整体可能在一定阶段会受到破坏和损伤,需要修复。本文认为修复和再生的合理技术方式必然是有机的,有机再生技术是修复地域性区段建筑空间环境的有效方法。以此为前提,提出了地域性区段建筑空间环境有机再生技术路径,并基于格式塔心理学、建筑类型学等,做了理论及案例解析,提出二元耦合设计方法及要素解构重组方法等可操作性较强的设计方法。以期从更为理性的角度,去解决地域性区段的建筑空间环境的修复问题。     

基于剩余使用年限的结构生命周期性能设计方法

基于概率理论结构设计的基本目的是使结构在预定的使用期内满足设计所预期的结构可靠性,包括安全性、适用性、耐久性。影响结构可靠性的荷载效应(直接或间接作用引起的结构的各种内力)与结构抗力(指结构承受荷载和变形的能力)因受到各种因素的影响,都是随时间或空间而变动的随机函数。在目前的超高层建筑结构的设计过程中,有关是否需要考虑作用及抗力的时变性能以及如何考虑的规定十分笼统。为了更加明确考虑时变性能在结构设计中的影响,在引入剩余使用年限的基础上提出了基于剩余使用年限的结构生命周期性能设计方法。并以一个超高层建筑为例,阐述了其具体应用,为今后工程中基于时变性能的结构设计提供参考。     

Flow Behavior of SUS304 Stainless Steel Under a Wide Range of Forming Temperatures and Strain Rates

To determine the flow behavior of SUS304 stainless steel under different conditions, axisymmetric compression tests were conducted over a wide range of forming temperatures (25 °C to 400 °C) and strain rates (10⁻³ to 10 s⁻¹). Flow curves were obtained for different forming conditions to study the influence of the forming temperature and strain rate on the flow behavior. Moreover, electron backscatter diffraction analysis, X-ray diffraction analysis, transmission electron microscopy, and Feritscope were used to study the microstructure evolution of SUS304 stainless steel under different conditions for determining the underlying reasons for the variations in flow behavior. The experimental results indicated that the flow stress decreased with increasing the forming temperature. With increasing strain rate at 25 °C to 200 °C, the flow stress first increased and then decreased; however, the strain rate had little effect on the flow stress at 300 °C and 400 °C. By analyzing the variation in the phase transformation inside compressed SUS304 stainless steel samples under different forming conditions, the key factors affecting the flow behavior of stainless steel were identified. Finally, by examining the variation in the martensite content and the dislocation density, the dominant deformation mechanism under different forming conditions was determined.

     

株洲市中心医院的结构设计

较详细地介绍了株洲市中心医院结构的设计过程,包括基础选型,超长地下室,钢结构屋盖设计,以及医疗设备用房相关的荷载取值,防辐射,直线加速器室,高压氧舱的设计要点等,相关设计方法可供同类项目参考。     

The impact of property price on construction output

The interaction between the construction market and the overall economy has attracted much attention, but few studies have investigated the influence of the property market on the construction market in terms of property price. The disaggregated data of Hong Kong’s housing and retail construction sectors are collected to investigate the impact of property price on construction output. The newly developed autoregressive distributed lag (ARDL) bounds testing approach and the error correction (EC)-based Granger causality test are employed. The bounds testing results suggest that there exist stable long-run relationships between construction output and property price for both housing and retail construction sectors. Specifically, a 1.00% increase in the housing price and retail price lead to a 0.55% and 0.42% increase in construction outputs for the two sectors respectively. In addition, the Granger causality tests confirm a distinct long-run causal flow from property price to construction output. Furthermore, the proposed ARDL approach provides an effective method for forecasting construction output.     

借鉴韩国“新村运动”经验 加快我国新农村建设

为了制定好“十一五”规划,在解决“三农”问题和促进农村经济社会发展方面切实迈出步伐,根据国务院领导的指示,由中研室、中农办、财政部、建设部、人民银行和贵州省的有关同志,到韩国就“新村运动”进行了考察。回国后,考察团提交了《韩国“新村运动”考察报告》和《关于建设社会主义新农村的若干建议》两个成果。我作为考察团团长,深深感到当前要抓住机遇,借鉴韩国经验,把我国社会主义新农村建设摆在国家重大发展战略的高度,切实有效地加以推进。一、韩国“新村运动”的主要做法和成效上世纪六十年代,韩国仍然是一个落后的农业国。1962年…     

Triangulated surface flattening based on the physical shell model

Journal of Mechanical Science and Technology - Triangulated surface flattening plays an important role in the surface shape design of a complex product, such as a vehicle, a train and an air plane....