Results 31 to 40 of about 731,336 (171)
四川大学学报. 自然科学版, 2015 针对无线传感器网络中的覆盖问题,提出一种基于遗传算法和移动辅助节点的两层扫描覆盖机制(GATSC).首先,GATSC利用遗传算法将POI分配给移动传感器节点进行覆盖,生成多条移动节点路径;然后,在移动节点路径上选取距离汇聚节点最近的一个点作为移动节点和移动辅助节点的交汇点(POB).最后,利用移动辅助节点将数据传输到汇聚节点,完成最终的数据采集.仿真结果表明,本机制不仅比以往的覆盖机制具有更好的性能表现,而且能很好地适应不同的网络环境.
闫远驰, 林锋, 周激流
doaj
Changes in the transformative potential of action proposals in Finnish Red Lists from 1986 to 2019
Conservation Biology, EarlyView.Abstract Red lists provide critical knowledge regarding biodiversity decline, especially in Finland, where broad assessments have been made regularly since the 1980s. They deliver information on the threat status of species and ecosystems, propose actions to guide conservation policy, and have the potential to spur transformative change.
Anni Arponen +4 more
wiley +1 more source
Scientists’ warning on the global destruction of rock outcrop ecosystems
Conservation Biology, EarlyView.Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula +19 more
wiley +1 more source
图象意义下不动点的Tikhonov良定性及其在对策论中的应用
四川大学学报. 自然科学版, 2007 引入了集值映射不动点在图象意义下的Tikhonov良定性概念.此概念是Lemaire等提出的单值映射不动点概念以及Yang和Yu提出的集值映射不动点概念在映射值意义下的Tikhonov良定性的改进.然后给出了判定Tikhonov良定性的在紧性条件下的一个充分条件和在非紧n维实空间下的充要条件.同时,也给出了广义集值映射不动点在图象意义下的Tikhonov良定性概念及相应的判定条件.最后,作为在对策论中的应用,导出了n人有限非合作对策关于Nash平衡点和n人非合作多目标对策关于弱Pareto ...
周永辉, 向淑文
doaj
Effects of restoration practices on biodiversity in temperate and boreal forests
Conservation Biology, EarlyView.Abstract Several restoration practices are used to mitigate and compensate for the negative effects of large‐scale forestry on biodiversity in temperate and boreal forests. A comprehensive synthesis of the benefits of these practices across taxa is missing. We conducted a systematic review and meta‐analysis on this topic.
Malin Tälle +2 more
wiley +1 more source
四川大学学报. 自然科学版, 2014 本文对动态量子点驱动的通过三个量子点接触的电子输运的静电调制效应进行了研究.通过对栅极施加不同电压形成不同的量子点接触静电势,从而改变动态量子点的形状.随着栅极电压的改变,电子库中的费米能也会随之改变,同时,影响下一个量子点接触的静电势垒的梯度.实验证明,量子点接触的电势并不总是阻碍电子输运.电势的调制能够帮助我们了解电子与电子之间的库伦阻塞效应.
吴海强, 郭华忠
doaj
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines multilingual practices in research interviews, focusing on English lexical insertions in Chinese‐language research interviews with teachers of Chinese in Australian secondary schools, and treating these code‐switches as analytically meaningful rather than incidental.
Chengwen Yuan, Tianwei Zhang, Gary Bonar
wiley +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) is increasingly used to support language learning, yet little is known about how younger learners accept and engage with AI‐assisted reading. This study investigates primary school students’ acceptance of and engagement with an AI‐supported adaptive reading application for English as a Foreign Language (EFL ...
Mi Tang +5 more
wiley +1 more source