Results 91 to 100 of about 4,294 (177)

基于自生成小波变换的配电电缆高阻故障精确定位方法

Gaoya dianqi
高阻故障是配电电缆常见故障形式之一，其准确定位对提升电网运行可靠性具有重要意义。针对传统小波变换中母小波需预设、难以与实际故障信号特征自适应匹配的问题，文中提出一种基于自生成小波变换的高阻故障定位方法。首先利用ATP-EMTP建立电缆分布参数模型，分析高阻故障击穿的波传播特性。其次，以故障波形初始段自适应生成母小波，并进行连续小波变换提取特征频率，实现故障精确定位。仿真结果表明，所提方法平均定位误差仅为0.168%，在鲁棒性、计算效率及采样频率适应性方面均优于传统过零点检测、傅里叶变换 ...
严有祥, 吴桐, 李振嘉, 陈静怡, 林智雄   +4 more
doaj  

[Development and validation of a risk prediction model for cognitive impairment in rural elderly Chinese populations: evidence from the CHARLS study]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Wang F, Li W, Shang X, Li F.
europepmc   +1 more source

[Exploration of the "Hainan Model" in the construction of specialized wound repair discipline]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Cheng SW.
europepmc   +1 more source

无联接变压器型智能软开关装置的故障特性及对应策略

, 2018
许烽, 宣晓华, 虞海泓, 陆翌, 裘鹏, 江道灼, 黄晓明   +6 more
openalex   +2 more sources

[Research progress in diagnosis and treatment of non-tumorous salivary gland diseases]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Cong X, Su J, Wu L, Ding C, Li W, Yu G.
europepmc   +1 more source

[Survey on sleep status and OSA-18 questionnaire among preschool children in Zhongshan City]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Xu C, Fu M, Pan Z, Luo J.
europepmc   +1 more source

配电网弧光接地故障暂态电压行波特性分析与故障定位

张佳军
openalex   +2 more sources

可分离连接器引发的典型故障分析

Gaoya dianqi
文中针对屏蔽型可分离连接器引发的典型故障，从产品结构和故障实物照片对故障原因进行综合分析并提出引发故障的原因。通过对屏蔽型可分离连接器环氧树脂与嵌件在不同的配合状态下进行建模和电场仿真分析，说明故障分析的合理性，并根据相关标准进行在此类绝缘故障条件下与正常条件下的局放对比测试实验，进一步证明了故障分析的正确性。结合故障特点提出避免此类绝缘故障发生的指导性意见。
王东方, 马永强, 王景, 邰晨凡, 牛勃   +4 more
doaj  

[Advances in clinical features, diagnosis, and treatment of pre-acute-on-chronic liver failure]. [PDF]

Zhonghua Gan Zang Bing Za Zhi
Nie YH, Cai DC.
europepmc   +1 more source

[Niemann-Pick disease with two missense mutations in SMPD1 gene: a case report and literature review]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Wei Y, Guo H, Xu JN, Chen YY, Shi HX.
europepmc   +1 more source