Results 101 to 110 of about 17,465 (227)
, 2019 本文以八层剪切型钢框架模型在白噪声激励作用下的随机振动实验为基础,分别从结构加速度响应的均值、方差、偏度、峰度、概率密度函数和累积分布函数等多个统计特征,对结构无损及9种模拟损伤工况进行识别,结果表明:结构随机振动加速度响应时程的偏度和峰度对结构损伤的表征效果不明显,而概率密度函数能初步判别损伤,方差指标在进行损伤判别的基础上,具有良好的损伤定位能力.国家自然科学基金青年科学基金项目(51508486)福建省自然科学基金青年创新基金项目(2016J05136 ...
施伟, 王子豪, 肖青松, 雷家艳
core
Functional Ecology, Volume 40, Issue 3, Page 750-763, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang +11 more
wiley +1 more source
Assessment of wind-induced fatigue crack initiation life at guyed mast earplate joints considering welding residual stresses [PDF]
, 2010 A new method for assessing the degree of the cumulative fatigue crack initiation damage of the welds of earplate joints of a guyed mast,which connect the mast with the cable,is proposed.Based on the multi-scale wind-induced stress analysis of the ...
Pi, Y, Qu, W, Wang, W
core
Latin American Policy, Volume 17, Issue 1, March 2026.ABSTRACT The rise of ride‐hailing platforms has profoundly transformed urban mobility in Latin America over the past decade. Transportation Network Companies such as Uber, DiDi, Cabify, InDrive, and others operating in the region have affected transportation patterns and intensified debates around labor relations, algorithmic management, regulatory ...
Ronald Sáenz‐Leandro
wiley +1 more source
Seismic Response Sensitivity Analysis of Soil-Structure Interaction Systems [PDF]
, 2015 本文概述了基于直接微分法的非线性有限元动力响应对于模型材料参数、几何参数和地震不确定性参数的敏感性分析方法,介绍了基于力法、位移法和三场混合法等方法的有限单元直接微分法敏感性分析最新进展,并着重讲述了将直接微分法拓展到非线性结构和岩土等材料模型中,用于分析土-结相互作用体系的敏感性分析方法。本文将此敏感性方法应用到一个有实际工程背景的受双向地震荷载作用下的三维土-结相互作用体系中,通过有限差分法证明敏感性分析计算结果的高效性和正确性,验证了此方法应用到实际工程中的有效性和实用性 ...
古泉, 曾志弘, 邱志坚, 郑翥鹏
core
Accelerating Just Energy Transitions in Brazil: Pathways for Social Development
Latin American Policy, Volume 17, Issue 1, March 2026.ABSTRACT This critical article analyzes energy poverty in Brazil from the theoretical perspective of distributive justice, proposing the implementation of a new social regulation called Contribution to Social Development. The goal is to support the process of a just energy transition leading to a broader debate on energy planning and social issues ...
Marcio Giannini Pereira +5 more
wiley +1 more source
Detection of Structural Local Damage Under Partially Measured Input and Output [PDF]
, 2009 土木工程结构在其长期的使用过程中，由于环境、材料本身老化等因素的影响，必将使结构产生不同程度的损伤。结构损伤使结构抵抗极端荷载的能力降低，从而有可能影响结构的使用要求，甚至导致重大事故的发生，因此对结构损伤的诊断引起了国内外广泛关注。 由于工程结构动力响应信息的不完备性、激振源的不确定性等因素的影响，传统的动力学系统识别理论和方法很难直接应用于实际工程结构的动力检测。因此，参数识别理论在土木工程实际中有很大的应用前景。本文依照上述实际工程背景，引入了输入输出部分观测的结构动力参数识别思想 ...
刘亚辉
core
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT This study examines the paradoxical relationship between policy learning and capacity: governments need certain capacities to learn effectively, yet these same capacities often emerge from previous learning experiences. Through a comparative analysis of Hong Kong and Singapore's responses to SARS and COVID‐19, we demonstrate how policy ...
Shubham Sharma, Xun Wu, Gleb Papyshev
wiley +1 more source
基于LS-DYNA的CT14高压断路器弹簧操动机构仿真与应力分析
Gaoya dianqi, 2017 弹簧操动机构是CT14高压断路器的关键部件,其技术性能的优劣对断路器影响重大。根据CT14高压断路器操动系统的结构尺寸及其三维实体模型,通过Hyper Mesh软件进行了有限元建模。基于系统中存在凸轮与滚轮的非线性碰撞以及操动过程中大位移、大转动、大变形等特点,选用LS-DYNA软件作为应力分析计算的工具,得到了断路器操动机构在弹簧冲击载荷作用下的应力分布情况,以及各个零部件在操动过程中的应力动态变化。分析了应力分布及其动态变化对断路器动力学性能的影响 ...
刘荣海 +6 more
doaj