Dianci bileiqi, 1992 氧化锌阀片直接用于无间隙避雷器中,在不同气体环境中（例如局部放电产生的气体）的性能需进行讨论,例如其周围介质为空气及空气分解生成物.SF6气体及其分解生成物的性能.试验表明,慎重地选择绝缘套及阀片叠装结构,避雷器内部干燥、清洁,就不易产生局部放电.恰当地选择材料配方、涂层及生产过程控制 ...
doaj
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Se PuZhang X, Liu S, Pan J.
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负密度制约和生境过滤对古田山幼苗系统发育多样性时间变化的影响
, 2014 负密度制约和生境过滤是解释森林群落物种共存和生物多样性维持机制的重要假说.已有大量研究表明,负密度制约通过优势物种的种内竞争及近缘种之间的种间竞争、个体间病菌传播等过程为非优势物种及非亲缘种提供生存空间,从而使局域群落的系统发育?多样性随时间的推移而增加;由于生境过滤的作用,特定的生境选择亲缘关系相近的物种,因而随着时间的推移,同一生境内群落间的系统发育?多样性会降低.前人的研究主要集中于利用负密度制约和生境过滤来解释物种多样性的空间变化格局 ...
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[Determination of eight ultraviolet absorbers in surface water and wastewater by ultra performance liquid chromatography-triple quadrupole mass spectrometry]. [PDF]
Se PuSun HJ +5 more
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Beijing Da Xue Xue Bao Yi Xue BanJi J, Wei J, Ji K, Bu Z.
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, 2013 基于捕食行为的录像资料,研究了鳜(Siniperca chuatsi)对似鱎(Toxabramis swinhonis)、鲮(Cirrhinus molitorella)、高体鳑鲏(Rhodeus ocellatu)、麦穗鱼(Pseudorasbora parva)、子陵吻虎鱼(Rhinogobius giurinus)及日本沼(Macrobrachium nipponense)的捕食选择性。在三种猎物试验中,鳜喜欢捕食高体鳑鲏和似鱎,很少捕食子陵吻虎鱼 ...
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Beijing Da Xue Xue Bao Yi Xue BanWang H, Jiang Y.
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Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiXiong Q, Hu Y, Fan L, Li J, Fu W.
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