Results 51 to 60 of about 3,213 (103)

基于临界折射纵波法的盆式绝缘子法兰螺栓松动检测

Gaoya dianqi
盆式绝缘子是GIS的关键绝缘器件，与两侧气室法兰通过螺栓进行紧固连接，当螺栓松动时会导致盆式绝缘子应力分布不均，从而影响GIS运行的安全性和稳定性。文中提出了一种基于超声临界折射纵波（LCR）的盆式绝缘子法兰螺栓松动检测方法，根据LCR波在盆式绝缘子法兰表面的传播声时差来反映螺栓松动情况。结果表明，当相邻螺栓松动时，LCR波在松动螺栓之间的法兰表面声时差变化最大，且变化量大于24 ns；当不相邻螺栓松动时，LCR波在松动螺栓正对的法兰表面声时差变化最大，且声时差变化量大于10 ns，并且螺栓松动程度越大，
葛健, 王伟, 宋建成, 焦国勋, 李鹏江, 高晋武, 任鸿秋   +6 more
doaj  

[Molecularly imprinted polymers： novel green preparation methods and cutting-edge applications review]. [PDF]

Se Pu
Li F, Jia B, Hu Q, He X, Chen L, Zhang Y.   +5 more
europepmc   +1 more source

基于超声波信号的10kV架空线路下山火预警监测研究

Gaoya dianqi
架空导线下方山火灾害导致电力线路跳闸事故时有发生。目前山火防治监测主要依靠全天候卫星和视频监测，受天气等因素影响较大，实时性差，研究一种不受天气因素干扰的早期山火检测预警方法具有重要价值。通过搭建10kV线路山火放电超声波监测平台，以稻草、竹子和松树西南地区常见植被为10kV线路下方山火火源，利用超声波探头采集放电超声波信号与燃烧超声波信号并进行时频域分析。研究结果表明：频域下稻草与竹子火焰下放电超声波信号波峰集中在40kHz附近，主峰幅值分别为-86.54dB、-99.81dB ...
蒋卓峰, 辜弘, 蔡乐辉, 陈天翔, 吴驰   +4 more
doaj  

支柱瓷绝缘子的超声波探伤检测方法和探头

Dianci bileiqi, 2009
专利申请号:CN200510030426.2公开号:CN1948962申请日:2005.10.12公开日:2007.04.18申请人:华东电力试验研究院本发明公开了一种支柱瓷绝缘子的超声波探伤检测方法,包括:a)向被检工件的检测面发射SH波;b)使用横波耦合剂将探头与被检工件的待检测面耦合;c)用探头在待检测面上进行扫查;d ...
doaj  

[Advances and challenges in new technologies for imaging evaluation of liver fibrosis]. [PDF]

Zhonghua Gan Zang Bing Za Zhi
Ge QC, Lu LG.
europepmc   +1 more source

[Predictive value of a multimodal radiomics model for central lymph node metastasis in clinically node-negative papillary thyroid microcarcinoma based on machine learning]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Feng J, Yang Y, Liu S, Qin A, Ye J, Jiang Y.   +5 more
europepmc   +1 more source

[Determination of five photoinitiators including 2，4，6-trimethylbenzoyl diphenyl phosphine oxide in gel nail polish by high performance liquid chromatography]. [PDF]

Se Pu
Gong X, Sun J, Li XX, Feng YL.
europepmc   +1 more source

[Impact of ultrasonic scaling on abutment screw torque in implant restorations]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Tang Y, Zhao X, Yang X, Jia H, Liu Y.
europepmc   +1 more source

[Simultaneous determination of vitamins K₁ and K₂ in cosmetics by QuEChERS-high performance liquid chromatography and verification by high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Sun Q, Chen CX.
europepmc   +1 more source

[Expert consensus on the diagnosis, treatment, and management of liver nodules (version 2026)]. [PDF]

Zhonghua Gan Zang Bing Za Zhi
Infectious Diseases Prevention and Control Branch, Chinese Preventive Medicine Association.   +1 more
europepmc   +1 more source