Results 31 to 40 of about 497,447 (299)
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
智能科学与技术学报, 2020 随着轨道交通网络规模的扩大和列车运营间隔的缩短，列车牵引能耗在快速增加。因此，通过优化列车的驾驶策略降低牵引能耗，对于轨道交通系统的节能减排具有重大意义。针对列车的驾驶策略优化问题，提出一种基于深度 Q 网络（DQN）的列车节能驾驶控制方法。首先介绍了传统的列车节能驾驶问题并构造其反问题，即通过分配最少的能耗达到规定运行时分。进一步将该问题转化为有限马尔可夫决策过程（MDP），通过设计状态动作值函数、定义动作策略选取方法等，构建基于 DQN 方法的列车节能驾驶控制方法。通过实际驾驶数据对DQN 进行训练，
宿帅 +4 more
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Conservation Biology, EarlyView.Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis +7 more
wiley +1 more source
Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 初步建立了基于作物模型的农田水分管理决策支持系统(DSSFWM) ,着重阐述了系统的实现原理,包括系统的结构和功能、系统管理决策目标的确立和水分管理决策的机制。以郑州冬小麦生长季水分管理为对象,对当地1991,1992年冬小麦生长季优化灌溉制度决策进行了实例分析。结果表明冬前分蘖期、返青期和拔节期灌三水的灌溉制度兼顾了节水(灌水量少)、高产、高效(效益费用比值较高)的多目标 ...
朱艳 胡继超 曹卫星 张佳宝
doaj
, 2010 河北省是我国缺水最为严重的地区之一，该地区人均水资源量307m3，耕地亩均 211 m3，属于严重的资源性缺水。本研究通过调查河北省水资源状况和农业节水发展 现状，探讨半旱地农业理论，提出河北省农业节水对策和建议，为缓解河北省水资源 紧缺，实现农业的持续发展提供方法和对策。主要研究进展如下： （1）河北省属于半湿润半干旱地区，干旱指数在1.0-3.0 之间，蒸发能力大于降 雨量。多年平均降雨量为531mm，一般年份无法满足小麦-玉米一年两季作物生育期 耗水需求。由于地表水资源匮乏，河北省80 ...
河北省农业节水对策研究
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Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca +23 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue banIn the multi-attribute decision-making under the probabilistic dual hesitation fuzzy environment, the decision-making process generally does not account for the group pressure and polarization the decision-making experts received in the discussion.
袁畅(YUAN Chang) +4 more
doaj +1 more source
, 2012 十一五期间,我国在公共政策管理方面取得了显赫的成就,决策更加地科学化、民主化和系统化。但我们也意识到,我国在公共政策的执行过程中仍存在滞后性,这不仅表现在地方政府与中央政府的博弈中,还表现在社会文化对公共政策执行上的制约。最为显著的就是传统的"儒学思想"根深于我们的政治文化中,导致了我们在公共政策执行过程中的偏差。本文针对"儒学思想"对公共政策执行的影响进行了深入浅出的分析,并对当前政治文化的创新与发展进行了客观点评 ...
杨阳
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Left-Behind Children in Rural China: Research Based on the Use of Qualitative Methods in Inner Mongolia [PDF]
, 2011 There is a dearth of knowledge about the experiences of primary school aged left-behind children in the family, school and the community. The term “left-behind children” has occurred in a variety of literature in China since the end of 1980s when the ...
LU, WEI
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