城市防渍减灾规划思考

防治城市渍水应走出“重排不重防”的误区,应积极研究开发“基于GIS的城市防渍减灾决策支持系统”,并建立生态性的城市防渍规划体系     

一类二阶泛函微分方程 x″(t)+f(t,x(g(t)))·Φ(x′(h(t)))=0的振动性

关于方程 x″(t)+f(t,x(g(t))·Φ(x′(h(t)))=0的振动性给出若干判别定理,判别准则均采用了形如 integral from n=1 to ∞ (f(t,c)dt),integral from n=1 to ∞ (tf(t,c)dt)的积分的敛散性.James.S.W.Wong 分别研究了方程 x″(t)+f(t,x(t))=0,x″(t)+a(t)f(x)g(x′)=0.笔者只要求Φ(y)>0,在其它条件相当情况下.推广了文[1]中相应结果.同时也推广了文[2]中定理1.而条件Φ(y)>0比文[2]中所给出的条件0相似文献   

某排污工程软土地基处理方案的优化

从技术、安全、经济等方面，通过对深圳市某排污工程软土地基处理的四种方案的综合对比，说明了在大型工程中合理选择方案的重要性。仅在该工程中的W133-W143采用格栅状双头喷浆搅拌方案代替原设计的单头喷粉方案就为国家节约大量投资。     

幕墙中埋件节点类型探讨

对幕墙结构中常见的8种钢结构埋件节点以及不同节点连接形式的受力特点进行了介绍和分析,探讨了节点的工作机理、力学性能和优缺点。说明所列举的不同构造形式的埋件节点均满足实际工程中不同连接形式的需要,为工程设计中应用提供了有益的参考,同时针对埋件节点的工程设计提出了一些建议。     

砖混结构屋顶构架的抗震计算

本文通过对非结构构件地震作用计算的分析和实例计算 ,介绍用“建筑结构三维分析与设计软件 TAT”,对砖混结构屋顶构架进行抗震计算的方法     

混凝土中钢筋锈蚀的电化学检测方法

综合分析了混凝土中钢筋锈蚀的非破损检测方法，在此基础上，着重剖析了常用电化学检测方法的优缺点、适用场合及其应用情况，指出了今后的发展方向。     

屈曲约束支撑极限承载力研究方法探讨

屈曲约束支撑极限承载力的研究方法目前集中在试验和理论分析方面,这些技术都是基于对实际结构进行大量的假设和简化,但简化和假设很难完全符合实际,特别是对于支撑的约束条件以及初始缺陷等会影响结构极限承载力的因素。提出用有限元技术来研究初始几何缺陷对屈曲约束支撑极限承载力的影响,以其与试验和理论相佐证。     

某综合楼的基础设计

介绍了某综合楼工程概况及地质勘察结果 ,针对其地质情况 ,阐述了在对地基基础设计时须解决的三个问题 ,并提出了相应的解决办法 ,经沉降观测 ,商住楼使用良好     

Analysis and jointing of polygonal road slabs

Conclusions 1. For anlaysis of circular (polygona) slabs which can be included in the category of absolutely rigid slabs, a practical approximate method of analysis has been developed and experimentally verified which permits determining the bending moments under centrally and eccentrically applied loads acting over a small circular area, as well as at any other points in the slab beyond the limits of the loaded area.2. Monolithic bonding of hexagonal road slabs up to 3–4 m² in area designed for the N-30 load results in increased design bending moments and, consequently, in thicker pavements. For these slabs it is expedient to use nonrigid joints, which do not transmit bending or torsional moments; however, these slabs must be placed on stabilized beds and their joints must be filled with waterproofing mastic.Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 19–22, September–October, 1974.     

Rheological and fractal characteristics of granular sludge in an upflow anaerobic reactor

The rheological and fractal characteristics of the granular sludge in an upflow anaerobic sludge blanket (UASB) reactor were investigated in this study. The influences of sludge concentration and temperature on the rheological properties of the granular sludge were evaluated, and the Bingham model was adopted to describe its rheology. In addition, image analysis was used to determine the sludge fractal dimension. The results indicate that the UASB granular sludge showed a shear-thinning behavior. The relationships between the limiting viscosity and the sludge concentration, as well as the limiting viscosity and temperature could be respectively modeled using an exponential equation and Arrhenius equation well. The Bingham model was able to adequately describe the rheology of the granular sludge. The fractal dimension of the granular sludge, 2.79+/-0.03, was larger than that of some other aggregates, suggesting that the granular sludge were more compact and denser. Furthermore, the relationship between rheological and fractal properties of the granular sludge could be properly described with the model proposed by Shih et al. [1990. Scaling behavior of the elastic properties of colloidal. Phys. Rev. A 42, 4772-4779].