Results 71 to 80 of about 25,946 (168)
The Research of Wind-induced Vibration Control of Benchmark Model Structure Based on Genetic Algorithm [PDF]
, 2012 在城市化的进程中，为了解决人多地少的问题，高层建筑如雨后春笋般的大量涌现。如今随着科技的进步和经济的发展，全球掀起了一波波的兴建摩天大楼的风潮，世界各国为争夺“第一高楼”，可谓是“暗战不休”，世界第一高楼的高度记录在不断被刷新。随着建筑高度的攀升，结构相对较柔，相应的风荷载增大，使得对高层建筑的风振控制变得非常必要。结构振动控制为结构抗风设计开辟了新途经，它改变了传统的单纯靠建筑结构自身性能抵御风荷载的设计思想，通过在结构中附设减振装置来减小建筑结构的动力反应。为了能对各种减振方法有一个公认的评价标准 ...
林倩
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Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Illegal wildlife trade (IWT) is one of the largest global illegal activities, and it negatively affects biodiversity and sustainable development worldwide. DNA barcoding coupled with high‐throughput sequencing (i.e., metabarcoding) is useful in identifying taxa affected by IWT and has been used routinely for decades.
Maria Joana Ferreira da Silva +9 more
wiley +1 more source
Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Dianci bileiqi, 2018 针对正负地闪准确区分识别技术手段较难的缺陷,对闪电电场的波形进行了分析,对地闪回击波形的参数特征进行了分析和统计,并研究闪电放电类型的自动识别。利用时间分辨率为50 ns的快天线电场变化和126 MHz甚高频（VHF）辐射资料,对雷暴过程中闪电的波形进行时域特征分析。通过对闪电电场波形数据的分析,给出了识别地闪回击的依据,设定回击的上升时间在120μs之间,下降时间在2.5500μs之间,编写程序实现回击的自动识别,并进行了实际测试。结果表明,自动识别程序对负地闪回击的识别效率可达95 ...
赵冲, 王宁, 张瑾
doaj
Study on the Mechanical Property of the “Turning” Structure System in Tall Buildings [PDF]
, 2008 “扭转体型”的高层建筑，由于其独特的几何形状给建筑的立面处理带来新意，近些年已有一些工程案例。众所周知，结构是建筑赖以存在的物质基础，与这种“扭转体型”建筑相配合的结构体系的抗侧力性能，是工程上关心的问题之一，然而国内外这方面的报道甚少。本文采用计算机数值模拟的方法，建立起扭转体型结构的计算模型，分析了不同荷载形式下结构受力和变形情况，并与框架结构形式进行了比较。研究分析表明，这种结构形式主要是由斜柱的轴力来抵抗水平荷载，属轴力体系范畴，并具有高效的抗侧力性能。在相同荷载作用下 ...
智平
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Experimental study on seismic performance of composite reinforced structure with shock absorption and energy dissipation of potentially collapsedrock mass [PDF]
At present, there are two types of structures for strengthening dangerous rock mass in earthquake area construction: anchorage and retaining. The connection between the two types of reinforced structures and the dangerous rock mass is rigid with very ...
Aishe ZHANG +5 more
core +1 more source
Politics &Policy, Volume 54, Issue 2, April 2026.ABSTRACT The Great Depression was a turning point in the development of social programming in North America. This paper explores the politics of social policy expansion during the Great Depression in the United States and Canada through an analytical lens that combines the insights of historical institutionalism and the analysis of transnational ...
Daniel Béland +2 more
wiley +1 more source
Study on Resistance to Progressive Collapse of Half-through Arch Bridge Based on Suspender Breaking [PDF]
, 2017 连续性倒塌是指结构局部构件的破坏导致相邻构件失效，从而引发更多构件破坏，最后导致结构的整体破坏或出现和初始破坏不成比例的大面积倒塌连琐反应。国内外对于房屋建筑结构的抗连续性倒塌已经有相应地规范和设计流程，但桥梁结构的连续倒塌研究较少。虽然房屋建筑关于抗连续性倒塌的成果为桥梁结构的抗连续倒塌分析提供了很好的借鉴，但不同结构的设计标准、结构物的可靠指标、荷载取值等方面的要求并不相同。本文结合中承式拱桥的结构特点，对其由于吊杆破断所引起的抗连续性倒塌机理进行分析 ...
白珂冰
core
Seismic Response Analysis of Small Modular Reactor Containment Based on LRB and FPS Isolation Strategies [PDF]
Small modular reactor (SMR) refers to a new generation of reactors with a unit power output of less than 300 MW. These reactors utilize innovative technologies for modular design and rapid on-site assembly.
JI Xiaoyu1, CHEN Nanyu1, CHEN Mufeng2, ZHANG Shuaijun1, HOU Gangling1, CAI Xuesong1
core +1 more source
Research On Seismic Strengthening Methods Of Existing Masonry Structure [PDF]
, 2010 2008年5.12汶川大地震之后，建筑的防震安全性能引起了全国的普遍关注。根据各地的自查结果，暴露出各地均有大量在用的建筑存在防震能力不足的问题。由于问题涉及很多地区，对既有建筑的防震安全改造成已为一个量大面广的难题。只有采用有限投入和最少扰动的方法对现有大量建筑进行防震加固、改造是消除重灾隐患的根本途径。 砌体结构在我国民用建筑中占有很大比例。到目前为止，我国的民用住宅建筑中仍有70%以上为砌体结构。虽然近几年全国为保护耕地，逐步禁止使用粘土砖，但大量的在役既有建筑仍无法全部立即退出使用 ...
廖子建
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