Results 11 to 20 of about 65,934 (177)
Wildlife Letters, EarlyView.Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu +5 more
wiley +1 more source
Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
wiley +1 more source
Research on Beamforming and Sparse Array Based on Convex Optimization [PDF]
, 2016 基于阵列天线在无线电系统中各种应用，使阵列综合的研究十分重要。本文根据实际应用系统中的各种需求，结合凸优化的高效、快速以及局部最优解也是全局最优解的优点，研究了各种阵列综合问题及基于凸优化思想的解决方案。 首先，本文基于凸优化算法对理想点源以及考虑阵列天线辐射方向图的阵列的综合方法进行了全面的概述，包含了阵列的无目标优化、最小副瓣优化、最大方向性优化、最大效率优化以及最小阵元数目的优化。并且，针对每个优化目标给出了相应的仿真例子，用以验证相应的综合方法的有效性。 其次，本文提出了矢量场的阵列综合方法 ...
杨晶
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Root exudates play a key role as signals and nutrients in mediating plant–microbe communication. However, critical knowledge gaps remain regarding how root exudates mediate soil–microbe–plant interactions to regulate crop yield under long‐term straw mulching combined ...
Jiajie Song +7 more
wiley +1 more source
Research on Modified Interpolation and Solving of Topology Optimization Based on Variable Density Method [PDF]
, 2016 拓扑优化是在给定载荷、约束等条件下，寻找材料在设计域内最优布局的优化设计方法。在概念设计阶段具有重要意义，可以帮助设计者选择合适的初始拓扑结构。与传统设计方法相比，具有设计效率高，提高材料利用率等优点。从经济方面来看，拓扑优化可以减少设计成本、节约原材料，是结构设计中公认回馈最高的优化方式，已经成为结构设计中的研究热点，对其进行研究具有重要的理论意义及工程应用前景。 本文分析了国内外拓扑优化方法的研究现状，总结了拓扑优化有关理论、方法及应用方面的研究进展，在此基础上针对变密度法拓扑优化方法中SIMP ...
张昆鹏
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Conservation Biology, EarlyView.Abstract Prioritization in conservation is crucial for the development of efficient and effective decision‐making policies. For many decades, the importance of some species and their habitats has been assessed and applied in conservation legislation, but bats and their diurnal roosts have ofbeen overlooked.
David López‐Bosch +6 more
wiley +1 more source
Design and Implementation of Adaptive Optimization System for Web Server Resources [PDF]
, 2015 经研究发现目前Web服务器面临的数据处理在不断的叠加，但是自身的资源优化存在较大的问题和漏洞，本文提出了Web服务器资源自适应优化机制，该机制首先对影响Web服务器性能的相关因素进行分析。在此基础上确定性能评价指标，对这些指标进行实时监控，并根据监控数据对Web服务器性能做出评价。最后依据评价结果对系统资源做自适应调整，从而实现在各种工作负载条件下，Web服务器资源自适应优化功能，保证Web服务器高性能运行。 基于前面的工作，建立了Web服务器资源优化模型，该模型实现了三大功能：一是运行状态监控管理功能；
胡奎
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
wiley +1 more source
The improvement research on multi-objective optimization algorithm based on non-dominated sorting [PDF]
, 2016 多目标优化问题（MOP）在许多科学研究和工程设计当中普遍存在，此类问题求解十分复杂但又十分重要。尽管传统多目标优化算法已经有了长足的发展，但遗存的问题依然很多，需要改进。 进化多目标优化算法将传统方法中的加权策略改为以种群为单位的进化策略，取得了更理想的优化的效果，NSGA-II就是其中的佼佼者。在此次研究中本人在NSGA-II的基础上提出了一种基于随机交叉算子、变异算子的算法RCVO-NSGA-II（RandomCrossVariationOperator ...
颜曙林
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Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source