Results 1 to 10 of about 1,328 (108)
Jianzhu Gangjiegou Jinzhan, 2021 在大跨度空间结构中,采用变高度变宽度加劲箱形截面形式的大跨度钢箱梁的力学行为非常复杂,除采用有限元计算分析之外,有必要对其承载性能进行试验研究,特别是足尺试验更能获取其整体承载能力和局部变形特性。为研究珠海国际会展中心二期屋面变截面加劲骨架式钢箱梁在设计荷载下的承载性能,首次提出一种合理简明且成本低廉的大跨度钢箱梁静载试验用横卧预应力加载方案,采用有限元计算结果对加载方案进行论证,成功进行大跨度足尺钢箱梁加载至设计荷载的承载力试验。试验结果表明,在设计荷载下钢箱梁的应力及变形均满足承载要求 ...
周进兵, 周安全, 徐余凌, 刘卓
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, 2023 九州工業大学博士（工学）1 Introduction|2 Principle|3 The Geometric Parameters and Models|4 Buckling Analysis for Dome Grid Shells with Orthogonal Grid and Inward Diagonal Member Grid|5 The Equation Fitting for Single-Layer Dome Grid Shells with Orthogonal Grid and ...
Liu, Baoxin, 劉, 宝新
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A multidisciplinary approach to estimating wolf population size for long‐term conservation
Conservation Biology, Volume 37, Issue 6, December 2023., 2023 Abstract The wolf (Canis lupus) is among the most controversial of wildlife species. Abundance estimates are required to inform public debate and policy decisions, but obtaining them at biologically relevant scales is challenging. We developed a system for comprehensive population estimation across the Italian alpine region (100,000 km2), involving ...
Francesca Marucco +30 more
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Conservation Biology, Volume 36, Issue 1, February 2022., 2022 Abstract Globally, ecosystem structure and function have been degraded by the cumulative effects (CE) of multiple stressors. To maintain ecosystem resilience, there is an urgent need to better account for CE in management decision‐making at various scales.
Jordan A. Hollarsmith +2 more
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Digital data sources and methods for conservation culturomics
Conservation Biology, Volume 35, Issue 2, Page 398-411, April 2021., 2021 Abstract Ongoing loss of biological diversity is primarily the result of unsustainable human behavior. Thus, the long‐term success of biodiversity conservation depends on a thorough understanding of human–nature interactions. Such interactions are ubiquitous but vary greatly in time and space and are difficult to monitor efficiently at large spatial ...
Ricardo A. Correia +12 more
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Jianzhu Gangjiegou Jinzhan, 2022 大跨度建筑空间大，火灾升温区别于小室火灾。大跨度建筑钢结构体系不同于多高层梁柱框架钢结构体系，其火灾下力学响应更加复杂。如何科学地评价大跨度建筑钢结构，特别是空间杆系钢结构和预应力张拉钢结构的抗火性能，受到了科研和工程技术人员越来越多的关注。简要回顾了大跨度建筑钢结构抗火的研究历程，论述了近年来大跨度建筑钢结构抗火研究的主要进展，并对大跨度建筑钢结构抗火研究提出展望。
杜咏, 李国强
doaj
Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
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Jianzhu Gangjiegou Jinzhan, 2022 准确模拟建筑物地震倒塌可为分析建筑废墟存活空间分布规律和构建救援生命通道提供重要的前期基础。以钢框架结构为研究对象，重点讨论钢框架、填充墙、填充墙与钢框架之间连接问题。采用有限单元法（FEM）和有限-离散单元法（F-DEM）相结合的方法模拟了2跨×3跨的3层钢框架填充墙结构，以倒塌模式为评价指标来验证数值模拟方法的准确性。结果表明：数值模型整体结构表现为倾斜式倒塌模式，朝大跨度方向倒塌并伴随扭转，与实际震害中外廊式结构的倒塌模式相一致；向着结构大跨度方向的存活空间逐渐减小 ...
裴学良 +4 more
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
core
Policy &Internet, Volume 17, Issue 2, June 2025.Abstract The spread of false and misleading information in digital communication spaces has enormous potential for harm in democratic societies, but has so far been insufficiently addressed by policy makers. This problem has been exacerbated by recent technological developments such as deepfakes.
Olivia Hägle +3 more
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