Results 81 to 90 of about 17,465 (227)
, 2008 通过小当量爆炸实验研究爆源近区地下结构动力响应和材料破坏行为。研究了地下管道结构的爆炸振动效应,分析了混凝土材料在爆炸冲击波作用下的破坏行为。结果表明,爆炸振动波使地下管道结构发生以瞬态径向压缩为主的变形,以及沿轴向和环向两方向的刚体振动响应。在爆源近场随爆炸折算距离变化,爆炸冲击波可以引起混凝土管道结构的3种破坏行为,即结构破坏 ...
马维
core
Review of Policy Research, EarlyView.ABSTRACT In the face of increasingly complex environmental challenges, subnational governments play a critical role in implementing climate policies. This study investigates how intergovernmental interactions—specifically formal authority interactions and informal competitive interactions—shape the adoption of climate policies by Chinese provincial ...
Shiming Zheng, Alex Jingwei He, Yujie He
wiley +1 more source
Application of Improved Kalman Filter Approach in Damage Detection of Frame Structure Considering Beam-to-Column Joints Damage [PDF]
, 2013 目前关于框架结构损伤诊断的研究大部分都着眼于框架结构梁柱单元的损伤，而实践证明，在地震荷载、暴风荷载或者长期荷载作用下，框架结构在梁柱连接节点处更容易发生损伤，因此节点损伤识别越发显示其重要性。然而对于复杂结构，其有限元模型存在大量的自由度，因而进行结构损伤识别时相应的计算量也会加大。论文在分析并总结了目前国内外结构节点损伤识别的研究进展基础上，用静力凝聚的方法将考虑梁柱节点作用的有限元模型进行简化，在文章的第一部分将静力凝聚方法同扩展卡尔曼滤波算法相结合，应用于考虑节点损伤的框架结构损伤诊断中 ...
李青
core
A review of platform designs for floating offshore wind turbines [PDF]
The vigorous development of wind power generation technology is the core path for the country to promote the low-carbon energy transformation and realize the "dual-carbon" (carbon peaking and carbon neutrality) goals.
Jianhua ZHANG +3 more
core +1 more source
Non‐Members in a Tight Spot: How Norway Navigated Autonomy in EU Pandemic Management
Review of Policy Research, EarlyView.ABSTRACT This study offers new insights into how closely integrated non‐member states navigate tensions between autonomy and dependence when urgent policy responses are required within complex supranational frameworks. It does so by exploring how these non‐members exercise their “wriggle room”—a tailored sub‐category of the broader concept of autonomy ...
Sjoerd Alexander de Winter
wiley +1 more source
Typical Elasto-Plastic Constitutive Models and Their Sensitivity Studies of Earth Materials [PDF]
, 2015 岩土类材料的非线性力学行为研究对于土-结构相互作用体系或者坝-地基-库水耦合体系的地震动力响应分析具有重要意义。比如砂土液化可能导致地基失效，继而引起上部结构破坏。混凝土坝的损伤开裂有可能演化成为坝的整体破坏甚至溃坝等重大灾变行为。因此深入研究岩土类材料地震过程中非线性破坏的力学行为是非常必要的。基于此，本文深入研究了三维J2模型，Cap模型、与压力无关多屈服面黏土（MYS）模型、与压力有关的多屈服面可液化砂土模型（包括砂土剪缩，剪胀，液化和应变滑移等复杂力学行为）、Drucker ...
邱志坚
core
Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
野生动物学报在人类世，人类活动的不断扩展和加剧，使野生动物的生存环境发生了巨大变化。这些变化不仅影响了野生动物的生存和繁衍，还对其体色适应产生了深远影响。体色作为动物适应环境的重要特征之一，对野生动物的生存至关重要。栖息地破坏、全球气候变暖、城市化和环境污染等人为活动因素导致的环境快速变化，破坏了动物基于颜色的伪装、通讯和体温调节等能力。动物改变体色增强反捕食和体温调节适应能力，但环境变化的速度超过很多动物的体色适应速度，种群面临强大的生存压力。未来的研究应该综合考虑不同干扰类型的影响、人为活动造成的生态系统破坏 ...
赖馥茜 +7 more
doaj +2 more sources
硬管母线连接的1000 kV复合外套避雷器和互感器地震模拟振动台试验研究
Gaoya dianqi, 2022 为研究地震作用下硬管母线连接的特高压复合外套电气设备的地震效应,依据特高压电气设备抗震试验方法进行了硬管母线连接的1 000 kV复合外套避雷器和互感器组成的互连结构体系的地震模拟振动台试验。通过白噪声扫频及标准时程波地震试验,测定了设备的自振频率以及关键部位的应变、加速度响应。试验结果表明:互连结构体系沿管母轴线方向的耦合效应强于垂直管母轴线方向;输入目标峰值加速度越大,互连结构体系的非线性特性越明显;沿管母轴线方向的地震波激励引起的扭转振动中互感器设备的地震响应较为显著 ...
孟宪政 +4 more
doaj