Results 51 to 60 of about 2,340 (103)

油纸绝缘在双极性衰减振荡冲击下的累积效应研究

Dianci bileiqi, 2017
电力变压器的内绝缘在雷电过电压的多次冲击下产生累积效应,影响其绝缘性能。研究表明实际雷电入侵波存在双极性衰减振荡波形的情况。首先用不同频率的双极性振荡衰减波波形,取低于其击穿电压的电压值,对油纸绝缘试品进行累积冲击,绘出其V-N特性曲线,验证了累积效应的存在性,探索了V-N特性的规律;继而用宽带频谱介电测试仪对在双极性振荡衰减波作用下累积冲击了100、200、300以及并未受冲击的绝缘纸进行测试,并对比分析了四种情况下复相对介电常数和介质损耗角正切值的变化规律,验证了累积效应对油纸绝缘的损伤 ...
李文娟, 王庆芬, 孙江浩
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[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

[Early Alzheimer's disease recognition via multimodal hand movement quality assessment]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Yang G, Zhu C, Wu J, Luo K, Chen X, Lin J.   +5 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

[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

[Research progress in surgical treatment of calcaneal fracture malunions]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Ji D, Wang Q, Zhao H.
europepmc   +1 more source

[Arthroscopic-assisted closed reduction and internal fixation with absorbable screws for Hawkins type <b>Ⅱ</b> talar neck fractures]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Dong Z, Cao Z, Dong H, Jiang H, Shi L, Zhang Y, Sun J.   +6 more
europepmc   +1 more source

[Oral Health Status of Obese Children andIntervention Strategies]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Cheng R, Lei L, Zhang R, Cai H, Hu T.
europepmc   +1 more source

瓷横担绝缘子冲击电气特性

Dianci bileiqi, 1975
冲击绝缘水平是瓷横担绝缘子的重要电气特性,以50％全波冲击闪络电压表示。冲击闪络电压有很大的分散性,没有固定值,但有一个范围。由于校正方法的精确性的差异,精密刻度的困难及其他难以控制的条件 ...
doaj