Results 71 to 80 of about 15,531 (185)
Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Guangtongxin yanjiu, 2015 为了探究高湿环境对光纤动态疲劳的影响,实验选取多组光纤,分别在高湿和一般环境下采用两点弯曲法测量光纤的动态疲劳。通过对动态疲劳曲线和实验数据进行分析发现,在高湿环境下,光纤所能承受的断裂应力会下降,且测试时的应力速率越高,断裂应力下降越明显,进而影响光纤动态疲劳参数Nd值。
陆云清 +4 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Generative artificial intelligence (GenAI) has emerged as a powerful tool in the Informal Digital Learning of English (IDLE) environment, offering personalized, interactive, and innovative language learning experiences that may enhance learning engagement.
Jin Liu, Meilu Liu, Yuan Yao, Dechao Li
wiley +1 more source
基于随机振动响应互相关函数的结构损伤识别试验分析 [PDF]
, 2011 提出了基于结构振动响应互相关函数分析的损伤识别方法。通过八层剪切型钢框架结构模型在模拟白噪声随机激励作用下的试验,利用相邻测点响应的互相关函数幅值向量变化,构造损伤识别因子进行结构损伤判定、定位及程度量化,结果表明该方法对结构损伤识别的简易性及有效性 ...
刘朝, 姚谦峰, 雷家艳, 雷鹰
core
Synthesizing Empirical Research on Learner Metacognition in Second Language Writing
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
wiley +1 more source
Shuitu Baochi Xuebao, 2023 粗糙度是影响坡面流水动力特性的关键因子,为探究渐变粗糙度影响下坡面流水力特性,采用粒子图像测速技术(particle image velocimetry, PIV)观测并分析3组流量下渐变粗糙床面下坡面流的流速轮廓线、紊动强度、雷诺应力和壁面切应力的变化规律。结果表明:(1)流速随粗糙度增加而减小;拟合无量纲流速得到流速分布对数公式,粗糙度增大与拟合常数A成反比,与积分系数B成正比。(2)渐变地表粗糙度流向紊动强度与光滑床面坡面流变化趋势相似。流向紊动强度随相对水深的增大而减小。随着粗糙度增大 ...
谷方正 +4 more
doaj
, 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
Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, EarlyView.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
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
Legislative Attention and Nonprofit Efficiency: A Link Across Sectoral Boundaries
Policy Studies Journal, EarlyView.ABSTRACT Government attention matters for nonprofit management and nonprofit‐government interactions. This study focuses on legislative attention, an important yet less‐studied aspect of government attention in public policy research, and examines its impact on nonprofit efficiency.
Yuhao Ba, Jessica Berrett, Jason Coupet
wiley +1 more source