Results 21 to 30 of about 14,754 (164)
How much biotic nativeness matters across human demographic groups
Conservation Biology, EarlyView.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source
Gaoya dianqi, 2020 换流变有载分接开关（on-load tap-changer,OLTC）是调整换流变工作电压的核心设备,其安全稳定运行对于保障换流变的安全具有重要意义。振动信号检测技术是分析换流变OLTC内部零部件故障的主要手段。为了实现换流变OLTC振动信号检测技术的工程应用,在江苏省某换流站开展了该技术的应用研究。分析了换流变OLTC典型振动信号的时域和频域特征,基于S变换研究了振动信号的时频域联合分布。提取了时域有效值、时域峭度、传动轴动作时间;频率重心;S变换能量熵等特征参量。基于所提出的特征参量 ...
陆云才 +4 more
doaj
, 2018 热带印度洋环流是由赤道环流体系、近赤道海域及边缘海环流和涡旋构成的有机整体,其动力调整过程受到印度季风和印度洋偶极子(IOD)驱动,具有复杂的多尺度变异特征.本文总结了近年来中国科学院南海海洋研究所在热带印度洋开展的大面积水文观测和数值模拟研究成果,其初步揭示了热带印度洋环流的多尺度演变特征及其控制机理.研究表明:(1)赤道风场直接驱动的开尔文波和罗斯贝波及赤道印度洋东边界反射的罗斯贝波调控着赤道潜流(EUC)和赤道中层流(EIC)的形成和演变;(2 ...
王东晓 +6 more
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
Shuitu Baochi Xuebao, 2002 对贵州喀斯特山区的土壤侵蚀所产生的环境变异作了论述。贵州喀斯特山区的土壤侵蚀不仅使土壤质量发生变异，而且对生态环境、农业生产环境都产生了十分严重的影响。自然植被减少、土地退化、石漠化已成为贵州喀斯特山区环境变异的重要特征。贵州喀斯特山区生态系统结构和功能的重建是治理贵州喀斯特环境变异的根本途径。
林昌虎 朱安国
doaj
QoS Routing Research Based on Improved Ant Colony Algorithm [PDF]
, 2008 QoS路由的基本任务是为一次连接寻找一条有足够资源、能满足QoS要求的可行路径。而现有很多算法只是针对一个或两个约束条件，在多种QoS约束下，这些算法具有一定的局限性。而蚁群算法是近年来对自然界蚂蚁的寻路方式进行模拟得出的一种仿生启发式算法，其具有很强的全局优化能力和本质上的并行性，同时比早期进化算法具有更强的鲁棒性、求解时间短、易于计算机实现等优点。求解带有多约束的QoS路由是其应用的一个重要领域。 本文分析了QoS路由研究的意义，介绍了QoS路由研究与蚁群算法研究的现状 ...
姚海亮
core
The effects of drought stress on the stoichiometric characteristics of C, N, and P in Pinus yunnanensis seedlings [PDF]
[Objective] This study aims to investigate the effects of drought stress on the distribution of carbon (C), nitrogen (N), and phosphorus (P) elements and stoichiometry in organs of Pinus yunnanensis seedlings, and to provide a theoretical basis for ...
CHEN Gang +5 more
core +1 more source
Estimation of global subsurface temperature anomaly based on multisource satellite observations [PDF]
, 2017 基于表层卫星遥感观测的中深层海洋遥感对于了解海洋内部异常及其动力过程有重要意义。如何从现有的海洋表层遥感观测资料提取海洋内部关键动力环境信息场是; 具有挑战性的海洋遥感技术前沿。本文采用支持向量回归(SVR)方法,通过卫星遥感观测获取的多源海表参量(海表高度异常(SSHA)、海表温度异常(S; STA)、海表盐度异常(SSSA)和海表风场异常(SSWA)),选择最优参量输入组合,感知海洋次表层温度异常(STA),并用实测Argo数据作精; 度验证。结果表明SVR模型可准确估算全球尺度的STA(1000;
严晓海, 汪小钦, 苏华, 黎文娥
core +1 more source
Carbon Emission Quota Budget Among Main Provinces of China in 2030 [PDF]
, 2023 [Objective] Under total carbon emission control, an equitable and scientific allocation of carbon emission quota among provinces of China is a key approach for achieving the “dual carbon” goal, as well as an important cornerstone of the carbon emission ...
Jiang Huiyuan, Liu Yingying, Wang Li
core +1 more source
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source