高层建筑基本平面形式及布局对城市总体通风的影响研究

该文从平面的视角出发,对高层建筑基本平面形式选择、总平面布局对城市风环境带来的影响进行分析.高层建筑的不同基本平面形式,以及总平面布局中朝向、尺度、外部空间等方面的不同设计决策,对城市总体通风的影响有显著差异.根据定性分析,以及PHOENICS流体动力学软件的模拟结果,总结高层建筑设计中需要考虑的平面选型和布局策略,以保证城市风道畅通,提高城市总体通风效率.     

巧妙利用地形,营造宜人的休闲居住空间——以温州洞头某滨海山地项目规划设计为例

以温州洞头某滨海山地项目的规划设计方案为例,从总体布局、交通组织、景观营造、建筑设计等方面入手,对如何利用山地的特殊条件,在保护自然生态环境免受大破坏的前提下,创造宜人的居住空间进行探讨,供类似工程借鉴。     

内嵌式防屈曲支撑钢框架加固既有混凝土框架结构抗震性能分析

针对既有混凝土框架结构存在承载力、抗震性能不足等问题,本文在内嵌钢框架-防屈曲支撑加固既有框架的试验基础上,对两榀经该方法加固的框架-支撑结构、一榀纯框架结构进行有限元非线性分析,以便深入研究合理的加固参数。用ABAQUS建模,钢材采用硬化弹塑性模型,混凝土采用塑性损伤模型,采用单调水平加载位移增量控制方式进行有限元模拟分析,得出骨架曲线并与试验结果比对。在此基础上分析结构内部受力过程,内力重分配规律,研究钢框架-支撑及节点连接处工作状态,为以后采用类似加固方法进一步改进内部配置、优化结构设计提供科学依据。     

嵌挤组装式混凝土砌块道路基层结构的试验应用

介绍了嵌挤组装式混凝土砌块道路基层结构的试验过程,论述了其道路组合设计方案及施工注意事项。嵌挤组装式混凝土砌块道路基层结构大幅度节约了施工时间,提高了工程质量。     

书香墨气六百年——南京成贤街源流初识

成贤街是南京市跨越六百年历史的文化名街。作者基于实地考察和历史地图及文献,追溯成贤街的文化渊源及明朝以后的历史流变,探讨了其独特的建筑风貌和人文特质。     

考虑圈梁空间效应支护桩的简化计算

支护结构圈梁的空间效应对支护桩的变形和内力有着重要影响.根据圈梁对支护桩的约束和变形协调,给出一种考虑圈梁协同作用的支护桩的简化计算方法,并结合实测资料进行了对比分析.     

Indentation deformation and cracking behavior of hydrated aluminoborate glasses

Aluminoborate glasses have recently been found to feature high resistance to crack initiation during indentation due to a highly flexible network structure. In cesium aluminoborate glasses, it has been found that the use of a simple post-treatment, namely aging in a humid atmosphere, can further improve this resistance. To better understand the mechanical properties of this glass family upon humid aging, we here study the effect of aging conditions on the structure and mechanical properties of Li,K,Cs-aluminoborate glasses. As expected, we find that higher humidity and longer aging time cause more pronounced permeation of atmospheric water into the glasses. Due to their denser structure and stronger modifier-oxygen bonds, the humid aging has a relatively smaller effect on the mechanical properties of Li- and K-containing glasses relative to Cs-containing glasses, with the latter achieving an ultrahigh crack resistance. We find that the humid aging leads to the formation of a hydration layer in the Cs-aluminoborate glass surface, with a thickness of around 26 μm upon aging at 23 °C with 40% relative humidity for 7 days. Moreover, a remarkable indentation behavior, that is, the observation of μm-sized shear bands inside the imprint of the Cs-glass upon aging at 60% relative humidity is reported. Taken as a whole, the work provides guidelines for how to control the humid aging rate as a function of relative humidity and temperature to form a hydration layer and thus achieve improved crack resistance in such glasses.     

Meta photonic crystal paper devices

Science China Technological Sciences -     

Hydrothermally stable mesoporous aluminosilicates with moderate acidity via degradation-assembly process and improved catalytic properties

Mesoporous aluminosilicates with hydrothermal stability and moderate acidity are synthesized via assembly of microporous zeolite precursors obtained by the degradation of zeolite NaY, denoted as “degradation-assembly” (DA) technique. By controlling the degradation degree of matrix NaY, precursors with larger spatial volume and stronger rigidity will be obtained. The characterization results showed that the walls of the mesophase in MDA (mesoporous aluminosilicate obtained by “DA” method) composed of the preformed zeolite Y building units and the moderate acidity was inherited from the introduced precursors. It was suggested that the more mature assembly units accounted for the increased acidity of MDA with more Al species retained in the framework of mesophases. The resulting aluminosilicates with simultaneously moderate acidity and hydrothermal stability showed superior catalytic properties when used in heavy oil catalytic cracking catalysts.     

Decarboxylative (4+1) Oxidative Annulation of Malonate Monoesters with 2‐Vinylpyridine Derivatives

A novel N‐iodosuccinimide‐mediated decarboxylative (4+1) oxidative annulation between 2‐vinylpyridine derivatives and malonate monoesters was developed. It offers a new way to construct indolizine derivatives by utilizing malonate monoesters as a C₁ unit. The alkyl 2,2‐diiodoacetate was found to be the active reaction intermediate during the transformation.