Results 11 to 20 of about 1,234,627 (169)
, 2023 大容量试验是检验电力装备性能，保障装备安全可靠运行的重要环节。现有的大容量试验回路主要依靠人工操作，存在流程复杂、效率低且易出错的问题。针对大容量试验回路智能化控制的难题，研究建立了冲击发电机单电机短路模型和双电机并联短路模型，分析了发电机短路特性，结合典型大容量试验回路设计了一键顺控方案，提出试验回路一键顺控操作流程。通过对发电机短路模型和大容量试验回路系统的仿真 ...
戴建卓 +7 more
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Gaoya dianqi, 2022 目前高压交流限流器试验验证方法有所欠缺，尚无直接依据的国内外标准，同时其短路试验所需的试验系统容量巨大，使得各实验室无法直接实施，需要考虑等效的试验方法。因此为了研究适合高压交流限流器容量试验的方法，文中基于耦合分裂电抗器型高压交流限流器的工作原理，首先对国内外现有相关标准和实验室能力进行研究分析，提出等效的容量试验方法。然后结合实际工况设计试验方案，对方案的可行性进行系统仿真分析。最后完成各项等效性试验的具体实施，试验参数满足预期要求，解决耦合分裂电抗器型限流器试验手段缺乏、等效性试验方法不足的问题。
冯伦 +4 more
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Dianci bileiqi, 2023 武器装备的防雷性能越来越受到重视，军用地面车辆的种类很多，涉及多个军种，当前虽然有一些针对特定类型车辆的雷电防护标准，但缺乏试验标准和相对统一的试验方法。从实际地面雷电环境出发，基于雷电效应和装备特点，参考已有的标准及航空装备的试验方法，系统地提出了适用于各类军用地面车辆的试验方法。包括雷电直接效应试验方法和雷电间接效应方法，试验对象包括整车及车载系统/设备，这些方法可用于防护研究及试验考核。
熊秀, 刘凯
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Integrative Conservation, EarlyView.We developed an effective ex‐situ conservation approach for an endangered orchid species, Dendrobium sinominutiflorum. A compatible fungal strain Tulasnella sp. was obtained by using in‐situ seed baiting technique. The Symbiotic germination with Tulasnella sp. significantly promotes seed germination and seedling growth.
Han‐Xiao Huang +6 more
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Methods in Ecology and Evolution, EarlyView.Abstract Elliptic Fourier analysis (EFA) is often employed in geometric morphometrics (GM), but the normalization of elliptic Fourier descriptor (EFD) has persistently posed challenges for obtaining unique and comparable results, especially in the application of outline‐based GM methods, which limits the implementation in automated analysis of numerous,
Hui Wu +6 more
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
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Role of funders in embedding tests in conservation practice
Conservation Biology, EarlyView.Abstract Effective conservation practice requires decisions based on reliable and relevant evidence, but significant gaps in the evidence base exist. Incorporating well‐designed tests of the effectiveness of interventions for biodiversity in conservation projects is one of the best ways to scale up the rate of evidence generation.
Rebecca K. Smith +28 more
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绝缘子的检查与试验方法讲座(五) 第五讲 绝缘子的其它专用试验方法
Dianci bileiqi, 1987 编入《绝缘子试验方法》标准中的试验方法,除了《一般试验方法》、《电器试验方法》和《机试试验方法》外,还有一些试验方法分别列在有关产品标准中,或者制订了专用的试验方法标准。例如,绝缘电阻试验列在GB774—80 《架空通信线路针式瓷绝缘子》标准中,热机试验和无线电干扰试验等则单独制订了标准。以后这些标准,将按照《绝缘子标准体系表》的规定,逐步归并在《绝缘子试验方法》标准中,作为一个具有独立内容的分部标准,这样《绝缘子试验方法》标准内容将更趋完臻。本讲主要讲这些试验方法中的一部分。
刘树横
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
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