Results 21 to 30 of about 881 (140)
The Research on Wind-induced Vibration Control of Large Span Roof Structures with Different Damping Systems and Optimization of MTMD Damping System [PDF]
, 2016 近年来，随着国内经济实力的增强和社会发展的需要，大跨空间结构在我国得到迅速发展，且跨度越来越大。由于大跨空间结构具有质量轻、阻尼小、柔性大、自振频率低等特点，因而对风荷载的作用很敏感。在风荷载的作用下，结构会产生较大的变形，严重降低结构的安全性和舒适性。为抑制结构的动力响应，学者们提出在结构适当位置处安装控制装置的概念。目前，高层建筑在风荷载作用下的振动控制研究已取得丰硕成果，并有大量的工程应用实例。然而，国内外学者对大跨空间结构的风振控制研究相对较少，因此有必要开展大跨空间结构的风振控制研究 ...
邵辉
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Stress assessment and control measures for deformed tunnel-crossing pipeline section [PDF]
Objective It is common for long-distance oil and gas pipelines to traverse mountain tunnels. The sections of pipelines passing through tunnels are susceptible to significant deformation due to internal pressure and temperature effects during the ...
Chunbin QIU
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Methods in Ecology and Evolution, EarlyView.Abstract DNA barcode‐based species identification has become pivotal in biodiversity research. Current barcoding‐based deep learning methods have advantages in species identification but exhibit significant limitations. By using COI barcoding alone, previous studies were unable to fully capture species identification features. Prior methods showed that
Bin Ye +4 more
wiley +1 more source
Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan PembelajaranThe current presence of the internet undeniably facilitates and accelerates individuals' ability to access and disseminate information, even leading to an information explosion. To manage this situation, digital competence is required to face the 6.0 era.
Aiga Ventivani +3 more
openaire +1 more source
, 2009 文章从闽西的地域特点、客家人的文化思想等诸多方面对闽西客家建筑诸多形态的成因进行分析,旨在揭示客家建筑与其周围的自然环境高度的协调性和适应性,深刻地反映了客家先人对所处客观生存环境适应 ...
戴志坚, 黄联辉
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Study on infrasonic leakage monitoring and signal processing for product oil pipeline [PDF]
Objective With the total length of oil and gas transmission pipelines increasing due to booming development, pipeline leakage monitoring has emerged as one of the critical technologies to ensure the safe and stable operation of these pipelines ...
Chen ZHANG +7 more
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, 2022 螺栓球节点常用于网架及双层网壳结构中，目前在一些小跨度、接近球形的单层网壳中也有所应用。现阶段对螺栓球节点网架及双层网壳进行分析时，通常将螺栓球节点假定为理想铰接，实际上该节点是介于刚接和铰接之间的半刚性节点。通过建立螺栓球节点的精细化模型，得到螺栓球节点的抗弯刚度及对应的弯矩-转角曲线，并利用已有试验数据验证了数值模型的合理性。研究了螺栓球节点相关参数（即螺栓直径、预紧力大小、锥尾壁厚和套筒厚度）对节点抗弯刚度的影响。研究表明：螺栓球节点的初始刚度和极限弯矩在一定范围内随螺栓预紧力的增大而提高 ...
喻晓晨, 张晓磊, 李会军, 陈旭
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Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2023 为研究泰姆科节点剪切刚度对铝合金单层球面网壳稳定承载力的影响，建立了单层球面网壳多尺度分析模型，结果表明泰姆科节点单层球面网壳承载力随跨度的增大而减小，随矢跨比的增大而增大。当网壳达到稳定极限承载力时泰姆科节点发生弯曲变形的同时伴随着剪切变形。通过对比单层球面网壳多尺度模型和弹簧单元模型的双重非线性稳定分析结果，发现节点剪切变形对结构承载力的降低程度随网壳跨度及矢跨比的增大而减小。最后，提出了一种可综合考虑泰姆科节点弯曲变形和剪切变形的节点“组合模型”，并验证了该模型能精准地反映泰姆科节点的力学性能。
芦燕, 彭冠楚, 张晓龙
doaj
, 2012 建筑结构在外部激励下的振动控制一直以来是振动控制领域研究的热点。其中,半主动控制策略包含了被动控制和主动控制的优点,能更有效地提高建筑结构的抗震性能,减轻其在动力作用下的反应及损伤。基于磁流变阻尼器的半主动控制策略也有很大的发展,在实际工程中已有所应用。磁流变阻尼器的主要性能取决于磁流变液成分。综述国内外磁流变阻尼器的研究发展历程,及其在建筑结构减震控制中的应用 ...
刘中华, 文善任
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