Results 101 to 110 of about 5,854 (159)

EEMD在输电线路雷电绕击与反击监测中的应用

Dianci bileiqi, 2016
针对雷击输电线路的问题,提出使用集总经验模态分解法（ensemble empirical mode decomposition,EEMD）对输电线路进行监测。ATP仿真雷电通过绕击与反击向高压输电线路注入雷电波的过程,并通过时频分析第一阶IMF分量瞬时频率分别确定了雷电绕击与反击时的频率特征和雷击发生时刻,结果表明:雷电绕击与反击时线路中将激发大量高频成分且最高频率可达100 k Hz;EEMD可以克服模态混叠实现输电线路信号分解;在100 Hz1 k Hz以及>10 k Hz,反击的频率成分更丰富 ...
赵阳, 陈则煌
doaj  

Absorbed N,P Amount of Millet and Soil Nutrient Loss as Affected by Different N,P Treatments in Slopeland

, 1998
氮磷配施对坡地谷子吸Ｎ，Ｐ量及土壤养分流失影响的研究表明：（１）Ｎ，Ｐ肥的不同配比均能增加谷子对Ｎ，Ｐ的吸收，增施Ｐ对Ｎ吸收的效果较高于增施Ｎ对Ｐ的吸收；（２）施Ｎ，Ｐ量的增加与泥沙中Ｎ，Ｐ富集率无相关关系；（３）作物生物量与土壤侵蚀量的相关系数为－０．９７２４；（４）增施Ｎ，Ｐ肥对土壤侵蚀和全量养分减少的程度远高于对径流量和速效Ｎ ...
吴瑞俊, 翟连宁, 郑剑英
core  

[Preparation of magnetic bifunctional materials for exosome capture from serum and phosphopeptide enrichment]. [PDF]

Se Pu
Wang ZR, Zheng HJ, Jia Q.
europepmc   +1 more source

[Identification of efferocytosis-related genes in osteoarthritis and prediction of traditional Chinese medicines based on bioinformatics and machine learning]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Xiang K, Zhang X, Li Z, Xu Z, Liu S, Chai Y.   +5 more
europepmc   +1 more source

[Tripeptide polymer-based cell-imprinted hydrogels for high-efficiency circulating tumor cell capture]. [PDF]

Se Pu
Sun W, Zhang Z, Zhao X, Chen J, Qing G.
europepmc   +1 more source

不同上方来水模式下工程堆积体坡面的植被调控

, 2019
为揭示植被格局对工程堆积体坡面水沙调控的影响，采用野外模拟径流冲刷试验，分析了 4 种上方来水模式（均 匀型、峰值前型、峰值中型和峰值后型）下坡面 5 种覆草格局（裸坡、坡顶聚集、坡中聚集、坡底聚集和带状格局）的 侵蚀特征。结果表明：水流功率与土壤剥蚀率之间相关性最高且呈极显著幂函数关系（R2 =0.47～0.72，P<0.01），是描述 堆积体侵蚀动力机制的最优参数。植被格局的减流效益在 12.23%～49.62%之间，减沙效益在 12.92%～80.54%之间，减 ...
冯志倩, 娄永才, 张恒, 李永红, 苏媛, 陈卓, 高照良, 齐星圆   +7 more
core  

[Single-cell RNA sequencing of B cells reveals molecular typing in Sjögren syndrome]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Lin W, Xie Y, Wang F, Wang S, Liu X, Hu F, Jia Y.   +6 more
europepmc   +1 more source

[Analysis of potential association of alcohol exposure with femoral head osteonecrosis and construction of a diagnostic model using machine learning]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Tao H, Liang F, Huang W, Fan S, Zeng P.
europepmc   +1 more source

[Applications of molecularly imprinted solid-phase microextraction coupled with chromatography/mass spectrometry for determination of drug residues]. [PDF]

Se Pu
Yan J, Huang J, Peng S, Man M, Sun D, Liu P, Chen L, Li J, Fan H.   +8 more
europepmc   +1 more source

Soil Nitrogen Loss in Runoff and Sediment as Affected by Level Trench and Crop Rotation

, 2002
5年轮作和 1年水平沟耕作试验表明 :在不同的坡度上 ,与传统耕作法相比 ,水平沟减少产流 7% ,径流液铵态氮浓度提高 19% ,流失量达到 13.0 1kg/ (km2· a) ,比传统耕作多流失 1.11kg/ (km2· a) ;径流硝态氮浓度减少 2 7% ,比传统耕作减少 7.6 8kg/ (km2· a) ;径流硝态氮流失减少量和铵态氮增加量相差 6倍 ,水平沟可减少 6 .5 7kg/ (km2· a)矿质氮流失 ;水平沟拦截泥沙 ...
张兴昌
core