Results 51 to 60 of about 14,784 (166)
Functional Ecology, EarlyView.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
, 2011 利用底部激光照射方法对水流下近壁面处的子母管结构尾流场进行PIV粒子图像速度场测量。取旋流强度作为流场旋涡强弱的表征参量,研究了无量纲子母管距离比(G/D)、母管与壁面的间距比(e/D)以及子母管直径比(d/D)等因素对结构尾涡脱落的影响。在亚临界流动条件下,当G/D>0.25时,子管对母管的涡脱落影响较小,二者尾迹相互独立,形成两列独立涡街;当G ...
唐驰, 崔金声, 臧志鹏, 高福平
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Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响
Conservation Biology, EarlyView.Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang +11 more
wiley +1 more source
不同土壤前期含水量对土壤分离临界水动力学特性及其抗剪强度的影响
Shuitu Baochi Xuebao, 2017 坡面土壤分离临界水动力参数的定量描述对完善土壤侵蚀物理模型具有重要意义。通过实测不同土壤前期含水量（5%～23%）和坡度（1°～10°）条件下黄壤坡面土壤分离临界水动力参数，并结合不同土壤含水量（3%～23%）对土壤抗剪强度的影响，综合分析及探讨不同土壤前期含水量、坡度和土壤抗剪强度与临界水动力特性的关系。结果表明：临界流量与不同土壤前期含水量和坡度呈幂函数减小关系，提出一种能够体现土壤前期含水量和坡度共同作用对临界水动力参数影响的预测方程。在坡度小于5°时，土壤前期含水量对临界水动力学参数影响较小 ...
王晨沣, 王玉杰, 王云琦, 胡
doaj
, 2018 海洋工程中的立管和系泊缆线等柔性圆柱结构轴线与来流常存在一定倾斜角度。由于轴向二次流的存在,倾斜圆柱涡激振动(VIV)相比于垂直圆柱更为复杂。如何对VIV有效抑制一直是工程界和学术界关注的焦点问题之一。本研究设计了室内拖曳水池模型实验,拖曳速度间隔为0.05m/s,范围为0.05～1.0m/s。观测了螺旋列板和控制杆对大长径比(L/D=350,L为圆柱长度,D为圆柱外直径)柔性圆柱横流向VIV的抑制效果,对比了垂直状态(α=0°,其中α为倾角)和倾斜状态(α=45°)附带抑制装置的圆柱模型振动特性 ...
徐万海 +3 more
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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
Shuitu Baochi Xuebao, 2018 坡面水流的输沙能力是影响土壤侵蚀过程的重要参数之一，加强坡面集中水流输沙能力的研究有助于深入理解集中流发生机理，并为防治集中流侵蚀发生提供科学依据。采用室内集中流放水冲刷试验，以黄土高原典型黄绵土为研究对象，研究了集中流输沙能力与放水流量和坡度以及与单宽流量和坡度之间的关系，同时对集中流水力参数和输沙能力的相应关系进行了研究。结果表明:集中流输沙能力随着坡度和放水流量的增加而增加。多元统计分析建立输沙能力与坡度和放水流量之间的幂函数关系发现坡度指标对输沙能力相对放水流量影响更大，而在坡度和单宽流量作用下，
师宏强, 谷
doaj
, 2018 由于三阶非线性薛定谔方程的普遍适用性,水波动力学与非线性光学在特定问题中展现中类似的现象。此文利用A kers-M ilew ski(AM)模型方程研究非线性深水重力-毛细波的动力学行为。数值结果显示,当高频的重力-毛细波列以近临界速度(23cm/s)移动时,初始的发展演化展现出与非线性光学类似的聚焦现象,这一结果与传统模型三阶非线性薛定谔方程的预测相符。更为重要的是,与非线性光学一样,对应于高斯型初值的点态聚焦与对应于超高斯型初值的环形聚焦均被A M方程的数值实验所证实。但重力 ...
王展
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Harnessing social media data to track species range shifts
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury +15 more
wiley +1 more source
Attainment Pairing Effects on Cognitive Conflict in Technology‐enhanced EFL Cooperative Tasks
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how attainment pairing (high‐high versus high‐low versus low‐low attainment) impacts English as a Foreign Language (EFL) learner engagement during technology‐enhanced cooperative writing tasks. Seventy‐eight Chinese university learners formed 39 dyads (13 pairs per group) via Tencent Meeting.
Ying Liu, Allen Thurston
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