Results 61 to 70 of about 4,577 (137)

开关柜内部局部放电检测用PCB偶极子天线的设计

Gaoya dianqi, 2016
开关柜内部空间有限、结构复杂,不便于局部放电超高频传感器的装设。文中基于PCB技术设计了一种适用于开关柜内部局部放电信号检测的超高频天线,在仿真分析的基础上对其结构参数进行了优化。利用矢量网络分析仪测试天线的端口特性,验证了天线的回波损耗和电压驻波比等参数。基于GTEM小室提供标准场,在不同工作频率下对天线系数进行了标定。采用针—板放电模型作为局部放电源,基于脉冲电流法测量放电量,对所设计的UHF天线进行了局部放电测试实验,实验结果表明该天线在工作频带内损耗低、方向性好,时域分辨率强 ...
贾勇勇, 杨景刚, 高山, 陶风波, 刘竞存, 张国钢   +5 more
doaj  

基于宽频振动传感器的电力设备状态监测方法可行性分析

Gaoya dianqi
宽频振动信号包括1 Hz~20 kHz的低频振动信号和20~500 kHz的高频超声信号。近年来，利用振动信号对变压器、电容器、电抗器等电力设备进行状态检测的手段日益成熟，超声信号也可以很好地检测出电力设备中的局部放电并定位，均已有较为成熟的应用。文中提出了基于宽频振动传感器的电力设备状态监测方法，并使用该传感器同时测量了脉冲振动源的振动以及油纸绝缘针板电极局部放电的超声，借助仿真对超声时延进行了修正，对局部放电进行了识别，并与脉冲电流法所得结果进行了对比。结果表明 ...
相晨萌, 高树国, 刘宏亮, 赵军, 孟令明, 贾云飞, 张凡   +6 more
doaj  

[Efficacy of precisely designed first dorsal metacarpal artery flap under the guidance of high-frequency color Doppler ultrasound in repairing small-sized skin and soft tissue defects in the thumb]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Fu JS, Liu Y, Wang H, Gao SH, Ma TP, Dong HS, Yu J, Yao J, Zhou T.   +8 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

[Evaluation of an interpretable 12-lead ECG automatic diagnosis model based on deep feature fusion]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Lu X, Chen H, Wu Q, Wen Y, Liu G, Chen C.   +5 more
europepmc   +1 more source

[Progresses on temporal interference electromagnetic stimulation for non-invasive deep brain function modulation]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Zhou T, Yu P, Xu Y.
europepmc   +1 more source

[Development and electrophysiological validation of a temporal interference transcranial magnetic stimulation system for mice]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Cui C, Wang T, Zhang Y, Zheng W, Xu G.
europepmc   +1 more source

[A multi-feature fusion-based model for fetal orientation classification from intrapartum ultrasound videos]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Zheng Z, Yang X, Wu S, Zhang S, Lyu G, Liu P, Wang J, He S.   +7 more
europepmc   +1 more source

[Application of multi-scale spatiotemporal networks in physiological signal and facial action unit measurement]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Xu S, Zhang S.
europepmc   +1 more source

[Effect of needle-knife release on the median nerve and transverse carpal ligament in rabbits with carpal tunnel syndrome]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Li Y, Zhou Q, Luo S, Lin W, Huang X, Cao Y.   +5 more
europepmc   +1 more source