Results 51 to 60 of about 847,250 (203)
Zhejiang Daxue xuebao. Lixue ban, 1999 实验发现稀土铽离子能与3,4-二羟苯丙氨酸发生络合反应,并发射出铽离子的特征荧光.本文对铽离子与3,4-二羟苯丙氨酸的络合发光反应进行了详细研究,由此提出了一种简便、快速、灵敏检测3,4-二羟苯丙氨酸的新方法,并且试验了其它氨基酸对其测定的干扰情况,表明该法具有较好的选择性.在激发波长为300nm,发射波长为490nm与550nm处测定其荧光强度，3,4-二羟苯丙氨酸浓度在2.0×10-8～5.0×10-5mol/L范围内与体系的荧光强度具有良好的线性关系,相关系数为0.9992,其检出限为6.0×10-
ShenXueyou(沈学优) +3 more
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Conservation Biology, EarlyView.Abstract Adaptive management of threatened species relies on having ex ante estimates of species’ responses to different interventions. Structured expert elicitation is often used to generate these estimates, but comparisons of these expert‐predicted outcomes with observed results are rare.
Helen J. Mayfield +18 more
wiley +1 more source
全球能源互联网以可再生能源和储能为主体的新型能源系统建设已成为能源转型的发展趋势。针对当前电化学储能面临技术经济性差以及供用能在品质上存在不匹配的问题，基于能量梯级综合利用的理念和共享经济的模式，提出热电联产型共享储能系统的技术与业态，探讨该类储能的基本运行原理、技术经济特性和商业模式。以高温固体蓄热、余热锅炉与汽轮机组成的典型热电联产型共享储能系统的案例分析表明，以固体蓄热为储能设备的热电联产型共享储能系统，在现有市场环境下实现系统经济性最优的容量配置和运行调度时，系统内部收益率达到10.6%、投资回收期为8.2 ...
冶兆年 +4 more
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Structured decision‐making as a framework to incorporate social equity into conservation decisions
Conservation Biology, EarlyView.Abstract Many conservation challenges require negotiating trade‐offs between the needs of different actors. Global frameworks such as the Kunming–Montreal Global Biodiversity Framework explicitly call for diverse participation and social equity in conservation decision‐making.
Emily Massingham +2 more
wiley +1 more source
全球能源互联网宽频振荡紧急控制是保障风电系统安全运行的“兜底”措施之一。由于风电系统非线性强度大及运行工况多变，难以建立宽频振荡在线风险评估的解析模型。为此，提出了基于数据驱动的宽频振荡风险在线评估方法及紧急控制策略。首先，设计了能够应对宽频振荡多模态和时变特征的宽频相量检测算法，为后续宽频振荡特征评估提供数据支撑；其次，利用最大李雅普诺夫指数作为宽频振荡动态演化趋势的量化指标，并根据风电机组模态阻抗的负电阻效应在线辨识宽频振荡源；然后，融合宽频振荡特征辨识结果，提出宽频振荡风险在线评估策略 ...
柳劲松, 马宁宁, 刘舒
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Comprehensive and representative conservation planning for biodiversity of ice‐free Antarctica
Conservation Biology, EarlyView.Abstract Antarctica is designated as a natural reserve devoted to peace and science, with Antarctic Specially Protected Areas (ASPAs) serving as the primary instrument for area‐based biodiversity protection. However, the existing ASPA network lacks the comprehensiveness and representativeness required under Annex V, Article 3(2), of the Madrid Protocol.
Wen Wen +3 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2005 在我国经济发达的城市密集地区，出现了一种新的地域空间形态——城市群，培育城市群已经成为区域提升综合竞争力的普遍策略，合理地组织城市群空间更是未来城市群发展的关键所在.基于交通方式的进步与城市群体空间演变的关系，通过分析浙中城市群空间结构的现状特征和未来的发展趋势，提出交通引导下的浙中城市群空间组织.
YANGJian-jun(杨建军) +2 more
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基于强化自组织映射和径向基神经网络的短期负荷预测 [PDF]
全球能源互联网, 2019 径向基（radial basis function，RBF）神经网络因其泛化能力强、收敛速度快的特点广泛应用于负荷预测。但传统采用K-means和自组织映射（self-organizing map，SOM）训练RBF径向基中心的方法因其全局搜索能力偏弱，仍然存在容易陷入局部最优解的问题，严重制约了RBF预测精度的提高。针对此问题，提出了一种基于强化学习（reinforcement learning，RL）改进的RBF短期负荷预测方法。强化学习通过环境的反馈不断完善搜索策略，具有非常突出的全局搜索能力 ...
黄乾, 马开刚, 韦善阳, 黎静华
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Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
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Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
wiley +1 more source