Results 41 to 50 of about 841,672 (145)
Shiyou jixie, 2014 在分析管道振动原因和控制指标的基础上，采用ABAQUS有限元软件对悬空管道进行了模态分析，并以模态分析为基础，采取谱分析方法对悬空管道进行了动力响应分析。以兰成渝兰州段某段悬空管道为对象，分析了7级和8级罕见地震作用下管道的最大应力和位移。分析结果表明，8级地震作用下管道的最大应力和位移为7级地震的22倍，不同烈度下管道的横向位移和应力响应要远远大于轴向位移和应力响应；对于大多数悬空管道，地震造成的影响较小，在工程安全判定中地震的影响作验证即可。最后就管道的不同部位，提出了几点防震措施。
赵潇, 马廷霞, 谢娜娜
doaj
A framework for integrating resilience indicators into risk assessments
Conservation Biology, EarlyView.Abstract Globally, ecosystems are increasingly threatened by climate change and human pressures, yet ecosystem risk assessments predominantly emphasize exposure to stressors while overlooking intrinsic ecosystem resilience—the capacity to absorb and recover from disturbances.
Benoît Pichon +4 more
wiley +1 more source
强台风下高压输电线路塔—线耦联体系的力学行为仿真分析三:动静力响应对比
Gaoya dianqi, 2016 高压输电线路风致倒塔事故是近年来影响电力系统安全运行的重要因素。文中以南方电网某220 kV输电线路为背景,考虑铁塔和导、地线之间的耦联影响,运用ANSYS有限元分析软件,建立直线段塔线耦联三基塔两回线模型,对模型分别施加设计风速下的风载荷与时变风载荷,对比模型在两种情况下的静动力位移、应力响应数值差异,分析表明塔—线体系中铁塔的x、z向动力响应位移明显大于静力响应位移,铁塔部分主材轴应力与静力响应数值相比明显增大。研究结果可用于输电线路在风载荷作用下的可靠性分析。
贺博 +5 more
doaj
Integrating biodiversity protection into emergency management
Conservation Biology, EarlyView.Abstract Megafires have emerged as a considerable threat to biodiversity conservation worldwide. The biodiversity‐focused response and recovery actions that occurred during Australia's 2019/2020 Black Summer bushfires demonstrate that it is possible to protect biodiversity alongside human life and property during disasters.
Jacey Roche Cerda +2 more
wiley +1 more source
Gaoya dianqi, 2022 海上换流阀在运行期间的安全性关系到海洋风电的有效输送。为研究支撑式海上换流阀塔运行期间的结构响应，依据某工程中的海上柔直换流阀建立有限元模型，通过模态分析和时程分析，研究了换流阀塔的自身振动特性和在环境荷载作用下的动力响应。结果表明，换流阀塔弱轴振动方向为连接前后两个单塔的方向，外荷载作用下将在此方向产生较大动力响应，换流阀塔运行期间的最大位移和最大应力均满足安全要求。
马志荣 +8 more
doaj
Effects of climate change on marine biodiversity on the western Atlantic coast
Conservation Biology, EarlyView.Abstract The current climate crisis, driven by greenhouse gas emissions, threatens global biodiversity, including that in marine ecosystems. However, projections for the western Atlantic Ocean that jointly quantify species richness and endemism while accounting for spatially biased and incomplete occurrence data remain limited.
Ubirajara Oliveira +33 more
wiley +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
wiley +1 more source
, 2007 与一阶无限小位移情况不同，张力腿平台（TLP）发生有限位移时，所受外力与响应耦合，运动方程也必须在瞬时位置建立。建立了有限位移情况下张力腿平台非线性动力响应分析模型，其中考虑了由六自由度有限位移引起的多种非线性因素，如各自由度之间的耦合、瞬时位置、瞬时湿表面等；还包括自由表面效应、粘性力等因素引起的非线性。推导出张力腿平台六自由度有限运动非线性控制方程。对一个名为“ISSCTLP”的典型张力腿平台进行了数值计算，求得该平台在规则波作用下的六自由度运动响应。用退化到线性范围的解与已有解进行了对比，吻合良好。
沈晓鹏, 刘洋, 曾晓辉, 吴应湘
core +2 more sources
Vocabulary Strategy Instruction in the Argentine EFL Context: Teachers’ Perspectives and Practices
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite extensive research on vocabulary strategy instruction (VSI), little has been known about teachers’ perspectives on how it is understood and implemented in practice. This study investigated Argentinian EFL teachers’ priorities in vocabulary instruction, their perceived knowledge of learner strategies for spoken vocabulary, and factors ...
Isobel Kai‐Hui Wang, Andrew D. Cohen
wiley +1 more source
The Effects of Gen‐AI on Situated and Future‐Driven Academic Writing Motivation
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite the increasing use of Generative Artificial Intelligence (Gen‐AI) in education, there is still a significant gap in understanding its effects on the situated‐ and future‐driven motivation in academic writing. This longitudinal design‐based research sought to explore variations in academic writing motivation of 110 Chinese university ...
Xiao Hu +3 more
wiley +1 more source