钢管混凝土拱桥拱圈上施工顺序影响分析

以某哑铃型钢管混凝土拱桥为例,采用MIDAS/Civil有限元模型从最大应力、最大位移、最小稳定系数三方面,对钢管拱圈后续施工三种不同的施工顺序进行了比较分析,为缩短拱桥施工工期提供了理论依据。     

构建具有民俗文化的地域景观——以西昌邛海缸窑湾度假村景观规划设计方案为例

民俗文化是地域景观的构成要素,民俗文化的传承对展现地域文化具有重要的意义,在城乡建设中对民俗风情的探索已经成为相关领域研究的热点。本文以西昌邛海缸窑湾度假村景观规划设计方案为例,通过对当地民俗文化从精神层面的解析,提炼成方案设计的手法,探讨如何在地域景观设计中更好地融入民俗文化要素。     

建筑业农民工就业培训之我见

农民工培训和继续教育是高速城市化发展进程中建筑业可持续发展的重要保证。本文对当前建筑业农民工培训存在的问题和困难进行了分析,对制约农民工培训工作长效机制建设的瓶颈进行了深层次的研究,提出了从构建体系、加强规划、政策引导、搭建平台、完善制度和营造氛围等六个方面优化农民工培训管理的一整套对策。对当前城市化进程中建筑业做大做强做优有一定的参考价值。     

初探高层建筑工程关键施工技术

随着高层建筑的应用范围越来越大,为了有效加强建筑的综合运作效益,有必要探究高层建筑关键施工环节的技术工艺。本文主要说明了高层建筑施工建设特点以及关键施工技术。     

丽水市建筑遮阳时间的确定

根据丽水市的地理位置、气候条件、太阳辐射、气象资料等情况,确定该区域建筑各朝向需要采取遮阳措施的时间,为当地建筑遮阳设计提供参考。     

普林斯顿公共图书馆

新建的普林斯顿公共图书馆是为该地区多元化且教育程度良好的社区大众而设计的。正如该图书馆主任所说的那样，它已经成为了一个“新时代的社区集会中心”。该图书馆坐落于普林斯顿市中心，它是其所取代的旧图书馆的两倍大小。当前，它已经成为了这一充满活力的社区的重要组成部分．并对周围市中心地带起到了积极的催化剂作用。     

Post-processor development for a turning and milling composite machine tool

The accomplishment of a turning and five-axis milling in only one setup is extremely useful and is possible on a turning and milling composite machine tool. In this work, we present a control algorithm and develop a post-processor for this machine, which has six linear and three rotary axes. To calculate a generalized kinematics model, coordinate systems are established by analyzing the basic kinematic chain relation of the turning and milling composite machine tool. The two vectors, which control the motions of the cutter contact workpiece, are simultaneously transformed to provide the algorithms of the rotary angles and motion coordinate. A special post-processor written in JAVA language is developed according to the proposed algorithm. To evaluate the effectiveness and accuracy of the developed post-processor, a specimen (blade) is used in the cutting simulation and real machining experiment. Experimental results showed the effectiveness and accuracy of the proposed algorithm. Furthermore, Compatibility is improved by adding new functions such as change of target machine, cutter location data change, workpiece origin offset, and cutting feed rate control.     

AT1200型斜天井钻机的研制与改进

为了解决倾斜矿体开采中斜天井掘进问题，我院新开发了我国第一代斜天井钻机产品。本文较详细地介绍了其设计思想，并对工业试验情况进行了分析。经过三个阶段的反复试验和改进后，使该设备具有优良的技术性能和使用效果。     

Perfluorosulfonated ionomers membranes: Melt‐processing and characterization for ion exchange applications

Perflurosulfonated ionomers membranes with different ionic‐exchange capacity were successfully fabricated via melt‐extruding and casting of their –SO₂F precursors. A systematical investigation of the thermal stability, crystallinity, and rheological properties of the precursors was performed to secure their optimized processing conditions. The tensile properties of acid‐form membranes are found to increase with base‐hydrolysis time, where a tensile strength of 38.2 MPa is readily obtained after 24 h's base‐hydrolysis. The content of –SO₂F or –SO₃H containing side‐chains plays an important role in the thermal stability, rheological, and mechanical properties of the precursor or the acid‐form membranes. The strong ionic interactions, attributed to the –SO₃H groups, lead to decreased crystallinity and tensile strength for different IEC membranes. The acid‐form membranes exhibit good proton conductivity and low methanol crossover in comparison with reference Nafion membrane. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39944.     

浮法玻璃切裁横断面白碴的解决

针对玻璃横切出现白碴缺陷情况,分析其产生的原因,并提出有效的解决办法。