广州典型保障房居住空间环境质量使用后评价及评价指标 敏感性探索

根据环境参量的主观敏感性选择 指标是确保使用后评价效度的重要技术环 节,本研究利用现场测试与主观评价对照 研究的方法,调查了7个广州保障房小区的典 型平面与居室空间,获得了89组有效实测数 据及192份住户评价问卷数据。建成环境使 用后评价调查数据反映：广州典型保障房居 室的通风质量较优,空气质量和自然采光良 好;环境噪声总体上略高于标准值;热环境 的不满意率比较高。研究根据89组主客观配 对调查数据,经相关分析、ROC曲线分析和 二元Logistic回归分析过程,得出了重要室内 环境评价指标的主观敏感性排序,即温度> 湿度>自然采光照度>PM2.5,而环境噪声指 标的实际价值需要进一步验证。     

Flexural strength analysis of non-post-tensioned and post-tensioned concrete-filled circular steel tubes

Concrete-filled circular steel tubes (CFT) have recently gained significant attention for their enhanced strength and ductility over the conventional steel and reinforced concrete construction. The concrete compressive strength is significantly increased by the lateral confinement provided by the steel tube and local buckling of the steel tube is restrained by the concrete infill. This paper investigates the further enhancement of these composite actions due to post-tensioning the concrete cores inside circular steel tubes. The flexural behavior of a post-tensioned CFT as well as a non-post-tensioned CFT was studied experimentally and analytically. A numerical algorithm for predicting the moment capacities of circular CFT, with or without the post-tensioning effects, has been validated against the test results by the authors as well as those published in the literature.     

More decidable instances of Post's correspondence problem: beyond counting

We present a new technique to decide or reduce instances of Post's correspondence problem. It generalizes balance arguments to a consideration about some special context-free languages which allow the combination with other decision (or reduction) techniques. In spite of its simplicity, the new technique is able to decide more instances than known techniques.     

浅谈某工程桩基设计

结合某工程桩基实例,对冲(钻)孔桩基设计中的后注浆、负摩阻、抗拔等问题进行探讨、分析,得到一些有意义的结论可供类似工程设计参考。     

学修视角下的中国汉传佛寺空间格局研究——由三个古代佛寺平面所引起的思考

本文以汉传佛寺空间格局为主要研究对象,从“学修体系-建筑载体”互动关系这-新视角。以“教育目标-学修体系-组织方式及管理制度-建筑空间格局”这一逻辑演进的脉络为研究模型。对中国汉传佛教不同历史时期的典型佛寺类型如“道宣式”、“百丈式”、“后百丈式”等。进行了梳理和研究。这一研究,是让活的人的因素重新回归佛寺建筑研究。是一种“正本清源”式的思路,成为理解古今佛寺空间格局嬗变的一把钥匙。     

Effect of post-weld heat treatment and electrolytic plasma processing on tungsten inert gas welded AISI 4140 alloy steel

Post-weld heat treatment (PWHT) is commonly adopted on welded joints and structures to relieve post-weld residual stresses; and restore the mechanical properties and structural integrity. An electrolytic plasma process (EPP) has been developed to improve corrosion behavior and wear resistance of structural materials; and can be employed in other applications and surface modifications aspects. In this study the effects of PWHT and EPP on the residual stresses, micro-hardness, microstructures, and uniaxial tensile properties are explored on tungsten inert gas (TIG) welded AISI-4140 alloys steel with SAE-4130 chromium–molybdenum alloy welding filler rod. For rational comparison all of the welded samples are checked with nondestructive Phased Array Ultrasonic Testing (PAUT) and to ensure defect-free samples before testing. Residual stresses are assessed with ultrasonic testing at different distances from weld center line. PWHT resulted in relief of tensile residual stress due to grain refinement. As a consequence higher ductility but lower strength existed in PWHT samples. In comparison, EPP-treated samples revealed lower residual stresses, but no significant variation on the grain refinement. Consequently, EPP-treated specimens exhibited higher tensile strength but lower ductility and toughness for the martensitic formation due to the rapid heating and quenching effects. EPP was also applied on PWHT samples, but which did not reveal any substantial effect on the tensile properties after PWHT at 650 °C. Finally the microstructures and fracture morphology are analyzed using scanning electron microscopy (SEM) and optical microscope to study the evolution of microstructures.     

冷轧薄板中浪板形缺陷的屈曲及后屈曲理论与轧试验研究

针对冷轧过程中常见的中浪板形缺陷,建立其产生全过程也即屈曲及后屈曲变形的解析计算的力学模型和求解方法,为了验证计算结果,在试验轧机上进行试验轧制研究.在试验中,通过设计不同的工作辊初始辊形轧制出各种不同大小的中浪浪形模态,并实测得到中浪浪形的几何参数和对应有关的轧制试验的设备与工艺参数以及轧件的规格与材质参数.运用所建...     

BT成为DHL创新计划全球合作伙伴

英国电信（BT）近日与邮递与物流集团Deutsche Post DHL签订了全球创新合作伙伴协议。根据协议,BT将为DHL解决方案与创新事业部提供支持,后者负责该集团所有的研发项目和创新,以孵化更多创新及开发新的物流服务和技术解决方案。     

灌注桩桩底后注浆效果分析与改进建议

分析福州市某高程建筑后注浆冲孔灌注桩的施工与检测资料,指出对强透水卵石土层实施注浆时,掺加速凝剂对提高基桩承载力的重要作用。并提出根据岩土层的透水性确定注浆水灰比、采用循环注浆管道系统以便正确地控制注浆压力、以及对长而大的冲钻孔灌注桩按规范的专门规定确定单桩承载力等建议。     

POE理论在快速公交枢纽站设计中的应用初探——以厦门快速公交第一码头站为例

本文以厦门快速公交第一码头枢纽站为例,运用POE理论,通过现场调研和数据分析,对其周边环境空间、建筑主体空间和交通流线进行建成环境使用后评估,以期对相关的枢纽站设计提供借鉴和参考。