Results 41 to 50 of about 497,447 (299)
Using customs data to understand overlooked trade in non‐CITES birds between Africa and Asia
Conservation Biology, EarlyView.Abstract The international trade in live birds poses risks to animals, people, and biodiversity. To effectively mitigate these risks, decision‐makers require information on the volume, dynamics, and direction of trade. Despite Africa once being the largest exporter of birds by region, very little data exist on recent trade in live birds not listed on ...
Alisa Davies +4 more
wiley +1 more source
四川大学学报. 自然科学版, 2005 炮兵火力决策问题是NP难题,用一般算法难以实现.运用遗传算法对炮兵火力决策进行了分析研究,具体步骤包括:编码和生成祖先群体、计算基因个体适应度和选择操作、交叉及变异操作.通过对这一问题的模拟仿真,获得了较优的决策方案.
刘淑东, 管群
doaj
, 2017 如今互联网推动人类进入信息爆炸时代 有限大脑容量与激增信息量间的巨大反差对人类决策提出了前所未有的挑战 但已有知识系统却找不出应对它的现成答案 围绕 互联网海量信息环境对人类决策的挑战 和 互联网海量信息环境下人类决策的应对方式 两个关键科学问题我们借鉴动物选择 无序个体单独行动 和 有序集体统一行动 的转换机制 提出互联网海量信息环境下的内外脑应对方式 ...
葛列众 +7 more
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, 2009 政策领导力是一种长远的引领的能力,它指的是政策整个过程的领导力,包括政策的制定、运行和监督、评估等环节。而政策领导力要发挥其功能,就必须在政策的整个过程中做到科学、有效、公平、公正。本文针对界定、运行及对策三方面对政策领导力进行论述 ...
黄岑
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Evaluating synthetic substitutes to reduce illegal harvesting and support species recovery
Conservation Biology, EarlyView.Abstract Providing synthetic substitutes is a widely promoted strategy to shift consumer demand away from wildlife products derived from threatened species. Yet, there is little evidence on whether product substitution prevents illegal or unsustainable harvesting and contributes to the recovery of threatened populations.
Aditya Shekhar Malgaonkar +17 more
wiley +1 more source
Gaoya dianqi, 2010 电磁环境是制约电网建设和发展的一个重要因素。研究输电线路电磁环境影响因素及其防护对策,可以为输电线路的设计提供技术依据,使人们正确认识输电线路电磁环境并合理选择防护对策。为此,笔者基于等效电荷法,研究了输电线路对地高度、双回路导线相序布置、等效半径、单回路导线布置方式、相间距离等因素对500kV超高压输电电磁环境的影响,并根据研究结论和相关研究成果提出了主动防护和被动防护等具体的防护对策。
王广周 +4 more
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, 1987 该项遥感技术是在自然资源调查应用的实验研究，在建立解译标志，遥感制图和使用新技术方面都有所创新，在全国遥感学术会议上受到好评。利用彩红航片编制了１／３．１７万，博湖地区芦苇分布图，编图精度较高，误差小于０．５％，芦苇面积４１３平方公里，误差小于０．０１５％，并提出了保护芦苇资源的建议，解决了轻工部门多次地面调查没有查清的博湖芦苇面积与蕴藏量，为博湖造纸厂 ...
中国科学院新疆地理研究所 年科技发展战略与对策研究课题组
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Conservation Biology, EarlyView.Abstract Knowledge of species distributions is essential for informing policies on nature conservation and restoration. However, updating them on a regular basis and doing so in a harmonized manner at the international level is difficult. The European Bird Census Council integrated national monitoring data covering 5 years to update farmland bird ...
Sergi Herrando +54 more
wiley +1 more source
Guangtongxin yanjiu, 2017 新型时域混合调制（TDHM）技术可以提高光通道的频谱使用效率,有效地提高光网络的容量。针对共享备份路径保护（SBPP）技术下的波分复用（WDM）光网络,我们结合TDHM技术研究了路由和波长分配（RWA）问题,并提出了一种基于最佳路径对策略的优化技术。仿真结果表明,与传统的最短路径策略优化技术相比,提出的最佳路径对策略能使被保护的网络容量提高30%,从而验证了TDHM技术对提高光网络传输容量的有效性。
陆冬磊 +4 more
doaj
Conservation Biology, EarlyView.Abstract Procedural, distributional, recognitional, and epistemic justice aspects of conservation interventions are well documented in contexts where pastoralism is a key livelihood and way of life. Geospatial analyses and representations of wildlife conservation and restoration that are increasingly applied in pastoralist rangeland socioecological ...
Ryan R. Unks
wiley +1 more source