Results 71 to 80 of about 2,015 (122)

在工频和冲击电压下,湿度对空气间隙和绝缘子放电的影响

Gaoya dianqi, 1974
在工频电压约700千伏(有效值),冲击电压约1500千伏以下,对直径为1米的球间隙、棒间隙、悬式绝缘子以及支柱绝缘子,进行了湿度影响试验研究。并得出了交流电压下湿度对圆柱式绝缘子、冲击电压下湿度对针尖——平板间隙的影响数据。 这些实验数据虽然是有限的,但足以得出湿度对放电电压实际是有影响的结论。特别是湿度高的时候,某些间隙和绝缘子工频放电电压将下降。因此,过去常用的负的校正系数,现应用正的校正系数去代替。 除了球间隙外,正冲击电压下得出的数据表明:随着湿度的增加,放电电压随之增加。负冲击电压下的湿度影响,
doaj  

风机接地系统雷击暂态特性分析

Dianci bileiqi, 2018
良好的风机接地系统对于风电机组的雷电防护至关重要,必须详细研究风机接地系统的雷击暂态特性。利用EMTP软件建立风机叶片、塔筒和接地系统模型,考虑雷电流冲击作用下接地体的散流特性和火花效应,分析地网暂态电位变化规律。讨论土壤电阻率、地网尺寸、地网形状对接地系统雷击暂态电位的影响,分析引外接地对于降低暂态电位的效果。分析结果表明:冲击电流引起的火花效应能够降低接地系统的冲击接地电阻;地网中心暂态电位随着土壤电阻率的增大而增加;地网尺寸越大、边数越多,接地系统雷击暂态电位越小,但是暂态电位下降幅度越来越缓 ...
万兴玉, 张忠会
doaj  

[Parent-child relationship and preschoolers' social skills: the cross-time chain mediating role of executive function and emotion regulation]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Li YW, Shao YQ, Zeng QY, Tian T, Li D, Yao MM, Chi X.   +6 more
europepmc   +1 more source

[Binary encryption comprehensive experiment based on agarose gel electrophoresis]. [PDF]

Se Pu
Duan JW, Ma L, Zhao Q, Wu QQ, Xin BY, Yang JH, Li Y, Wang QZ.   +7 more
europepmc   +1 more source

[Finite element analysis of skeletal injury mechanisms in adult standing positions with both feet landed on the ground]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Yuan H, Gao S, Wei Z.
europepmc   +1 more source

[Closed-loop regulation system for paralyzed lower limb joint movement based on electrical stimulation of spinal central pattern generator]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Shen X, Zhang X, Lou X, Gu H, Bian X, Zhong H, Zhao Y.   +6 more
europepmc   +1 more source

[Efficacy and safety of super electroconvulsive therapy for treatment-resistant depression: a retrospective analysis of 292 cases]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
An J, Chi Z, Zhao C, Li Y, Wang R, Hu Y.
europepmc   +1 more source

[Current status and prospects of family financial toxicity in childhood malignancies]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Wu ST, Wang CL, Shi DR.
europepmc   +1 more source

[Refractory systemic lupus erythematosus-associated thrombocytopenia treated with avatrombopag: A case report]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Tang X, Ding Q, Zhang Y, Wang Y, Tian M, Sun Z, Wang R, Chen Y, Liu J.   +8 more
europepmc   +1 more source

[Clinical Manifestations of Childhood Systemic Lupus Erythematosus-associated Acute Pancreatitis and Evaluation of the Efficacy of Plasma Exchange Combined With Glucocorticoids]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Xiong L, Guo H.
europepmc   +1 more source