Results 31 to 40 of about 10,237 (132)
Wildlife Letters, Volume 3, Issue 2, Page 46-55, June 2025.Pond and riverine turtles respond to land‐use in similar ways being sensitive to increased exposure to roads but resilient to agriculture. ABSTRACT Freshwater turtles are highly diverse in the southeastern United States, yet few studies document how diversity is distributed in agricultural and rural landscapes.
Rowland Fournier +7 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2023 提出了一种塑性可控的钢制连接装配式剪力墙，将结构的塑性损伤与破坏集中在钢制连接件上，主体结构基本保持完好，能够改善钢筋混凝土剪力墙的破坏模式，避免罕遇地震作用下剪力墙在墙体底部发生严重塑性损伤，提高剪力墙的震后可恢复性。对高宽比为1.0的现浇剪力墙、塑性可控的钢制连接装配式剪力墙及更换损伤钢制连接件的装配式剪力墙进行了拟静力试验研究，考察其破坏形态、抗剪承载力、滞回性能、耗能能力等抗震性能指标。结果表明：钢制连接装配式剪力墙的破坏集中在钢制连接件上，墙体损伤程度明显减轻，具有较高的抗剪承载力 ...
刘如月 +4 more
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Antipode, Volume 57, Issue 3, Page 1148-1171, May 2025.Abstract The COVID pandemic disrupted traditional entrepreneurial governance arrangements. When the state's action could not effectively govern society, the “entrepreneurial self” began to emerge and manage the crisis. Using Shanghai as a case study, this research examines the dynamics of “community group‐buying” during its city‐wide lockdown in 2022 ...
Ying Wang +3 more
wiley +1 more source
Jixie chuandong, 2009 针对卫星用微飞轮的特殊工作环境,设计了一种PTFE-Si3N4特殊材料轴承。PTFE材料存在强度、刚度低的问题。为验证其承载能力能否达到微飞轮工作要求,对其进行了静态接触应力和接触刚度两方面的静态性能研究。运用ANSYS软件对其进行静力学接触分析,并与赫兹理论计算结果进行比较验证。利用MATLAB软件对静态接触刚度进行求解计算。分析和计算结果表明PTFE-Si3N4轴承承载能力较差,接触刚度较低,但能够满足微飞轮应用需要。
田波 +4 more
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Predicting fidelity and treatment outcomes in savoring interventions among mothers of young children
Infant Mental Health Journal: Infancy and Early Childhood, Volume 45, Issue 5, Page 497-515, September 2024.Abstract Savoring impacts parents’ emotions and parent–child relationship quality. Using data from a randomized controlled trial (N = 164 mothers of 18–27‐month‐olds, 37 interveners) conducted with a community sample in the United States, this study examined predictors of fidelity and treatment outcomes across two savoring preventative interventions ...
Jessica L. Borelli +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan基于双肢短剪切型耗能段的耗能机制、形状记忆合金（shape memory alloy， SMA）棒材的超弹性特性和碟形弹簧的恢复力特性，提出了一种自复位双肢剪切型耗能段（self-centering coupled shear link， SC-CSL），该耗能段可有效提高中心支撑钢框架结构的抗震性能和震后恢复能力。采用校正的有限元法对SC-CSL的力学性能进行分析，研究其滞回性能和破坏模式；随后对考虑了SMA棒材直径和碟形弹簧刚度的10个模型进行了参数分析。结果表明：SC ...
朱剑波 +4 more
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Multiple‐stressor effects on leaf litter decomposition in freshwater ecosystems: A meta‐analysis
Functional Ecology, Volume 38, Issue 7, Page 1523-1536, July 2024.Read the free Plain Language Summary for this article on the Journal blog. Abstract Recent years have witnessed a surge in research on the effects of multiple stressors in freshwater ecosystems. While studies have increased, the synthesis of their findings into a broader understanding of ecosystem‐level effects remains an ongoing endeavour. Leaf litter
Graciela Medina Madariaga +6 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 为研究装配式偏心支撑钢框架在地震作用下的抗震性能与破坏机理，对两种1层单跨的剪切屈服型装配式偏心支撑钢框架进行了拟静力试验，分别从两种框架的斜撑构造以及可替换能力两方面研究装配式偏心支撑的抗震性能，观察钢框架在低周往复荷载作用下的破坏特征，结合试验结果深入分析此类结构的抗震性能指标。试验结果表明：斜撑构造对装配式偏心支撑钢框架的抗震性能有较大影响，斜撑与框架横梁间采用螺栓连接的钢框架REBF在承载能力、耗能能力、耗能梁段的转动能力等方面均优于上半部分斜撑与框架横梁间采用焊接连接的钢框架KEBF ...
叶重阳, 王新武, 时强, 孙海粟
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鼓蜂窝四撑杆型索穹顶抛弃传统概念，结合了多撑杆构思，是构形最为丰富的一类索穹顶结构。为研究新型鼓蜂窝四撑杆Ⅲ型索穹顶结构静力性能，选取下弦节点布置方案1，建立120 m跨度有限元数值分析模型，研究该结构在不同荷载水平及分布方式下的结构的变形和内力变化。并进一步对结构进行参数化分析，研究包括初始预应力水平、矢跨比、撑杆高度（厚跨比）及下弦节点布置方案等不同参数对于结构整体刚度与承载力的影响及变化规律。分析结果表明鼓蜂窝四撑杆Ⅲ型索穹顶具有良好的结构性能，各索杆均不容易发生破坏，结构整体刚度大 ...
储熠熠 +4 more
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Jianzhu Gangjiegou Jinzhan, 2022 冷弯C形钢在轻钢结构中应用广泛，采用垫板加高强螺栓的连接方式，拼合形成双轴对称截面，构建了一种组合截面门式刚架结构。对5榀平面刚架试件进行拟静力试验，分析其破坏特征、耗能能力、抗侧承载力等力学性能，探究柱腹板高度及刚架跨度对此类刚架结构抗震性能的影响。研究发现：该类门式刚架结构抗震性能良好，具有较好的耗能能力，抗侧力能力满足规范要求；节点传力可靠，可实现“强节点弱构件”和“强柱弱梁”的抗震设计要求；设计时可根据荷载情况增加柱腹板高度，但对刚架跨度一定要综合考虑梁柱线刚度比的大小 ...
陈明 +4 more
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