Results 11 to 20 of about 16,973 (119)
Robust resource allocation algorithm for heterogeneous wireless networkwith SWIPT [PDF]
, 2019 To improve energy efficiency and robustness of heterogeneous wireless networks with wireless information and power transfer,the robust joint transmit power and power splitting resource allocation problem was studied.Based on mini-max probability machine ...
Guoquan LI +4 more
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Sub-Synchronous Oscillation Suppression Based on VSG Virtual Impedance Feasible Domains [PDF]
[Objective] The virtual synchronous generator (VSG) system exhibits negative damping characteristics under weak grid connection, which triggers subsynchronous oscillations and leads to system instability.
Qin SUN, Yi DU, Yuxin SUN
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Shuitu Baochi Xuebao, 2020 以北京市漫水河流域为研究对象，对漫水河1956-2016年年降雨量、年径流系数变化特征及径流系数突变性进行分析，以2000-2016年代表现状下垫面条件，采用主成分分析法分析了时段降雨量和年降雨量对年径流系数的影响，并建立了年径流系数与主要降雨因子的线性主成分回归模型及基于LM（Levenberg—Marquardt）算法的BP神经网络模型。结果表明：漫水河流域年径流系数在过去的61年间呈极显著下降趋势，年径流系数从1956年到上世纪70年代初、上世纪70年代末到80年代末 ...
王少丽 +5 more
doaj
Dianci bileiqi, 2020 10 kV配电线路耐雷水平较低,雷击跳闸事故频繁。而杆塔分流系数对线路的耐雷水平至关重要。根据某山区大跨越10 kV线路参数,利用ATP-EMTP软件建立10 kV线路仿真模型,量化分析线路避雷器装设前后对杆塔分流系数的影响,以及改变避雷器接地电阻大小后,杆塔分流系数的变化规律。仿真结果表明:雷电流10 kA时,装设避雷器后杆塔分流系数降低了72.38%,且避雷器接地电阻降低一半,则杆塔分流系数可至少降低20.9%。最后通过对该10 kV线路进行具体改造,大大提高了线路的耐雷水平。
曾程 +4 more
doaj
The systematic modeling and performance optimization of the integrated solid oxide fuel cell-gas turbine and organic Rankine cycle combined power system [PDF]
, 2016 中国是世界最大的能源消费国，占全球消费总量的23%，但能源综合利用效率普遍较低。据统计，美国的能源效率高达60%，欧洲超过60%，其它发达国家的平均水平为50%，而中国仅为33%[1]。另一方面，中国单位GDP的能耗是世界平均水平的3.2倍，其中50%以上的工业能耗以热能的形式耗散，温度在350℃以下的低品位余热在工业过程中普遍存在。如何实现能源系统向清洁、低碳、高效的方向转型成为中国当前面临的最大问题之一。 近年来，随着集中式供能弊端的逐渐显露，以燃料电池、有机朗肯循环 ...
刘浩仑
core
Methods in Ecology and Evolution, EarlyView.Abstract Molecular identification of insect food webs can accurately reveal complex trophic interactions and serve as a foundation for understanding ecosystem functioning and advancing biodiversity conservation. This process typically involves DNA library construction, high‐throughput sequencing and subsequent steps, including data assembly, annotation,
Xiao‐man Zhang +9 more
wiley +1 more source
Gaoya dianqi, 2022 合理控制高压断路器的关合和开断时刻可以在一定程度上降低系统中的暂态过程，选相关合和开断一直是高压断路器在工程应用中的关注点。文中通过等效电路建立了高压交流断路器不同期短路关合过程计算的数值分析模型，可以计算得到任意时刻的全电流、断口电压、交流分量电流和直流分量电流。通过验算国家标准GB/T 30846—2014第4.102规定的短路关合峰值系数验证了计算模型的正确性，并计算了中性点有效接地系统不同期短路关合的峰值系数。最后，应用两个算例分析与讨论了中性点有效接地系统和非有效接地系统中断路器的选相关合技术，
李志新, 吴限, 苑婷, 毛武平
doaj
Gen IV Energy Conversion Systems——Research on Modeling of Supercritical Carbon Dioxide Brayton Cycle and Technology Readiness Assessment [PDF]
, 2014 能源是人类社会发展的基本动力。随着生活水平的提高，人类对能源需求持续增加，同时也希望获得和使用更多清洁的能源和转换效率更高的技术与系统。人类使用能源正面临着实现经济和社会可持续发展的重大挑战。能源的生产和利用是造成环境污染的重要原因之一，因此在有限资源和环保要求的制约下合理利用能源资源是实现可持续发展战略的关键。为了更有效地利用能源，需要对能源开发和能量转换系统进行研究和开发。 超临界二氧化碳布雷顿循环（S-CO¬2）作为第四代核电反应堆的新型能量转换系统由“第四代国际论坛”提出 ...
杨文元
core
Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
wiley +1 more source
Policy Studies Journal, EarlyView.Abstract Studies of lobbying typically look at the extent to which interest groups realize political goals on issues they actively lobby for. Little is known, however, about the extent to which interest groups attain their political goals without making an active lobbying effort.
Marcel Hanegraaff +2 more
wiley +1 more source