Results 81 to 90 of about 3,433 (125)

[Determination of eight per- and polyfluoroalkyl substances in seawater using dispersive membrane extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Ren Z, Ma JP, Liu YJ, Zhang L, Wu GG, Li S.   +5 more
europepmc   +1 more source

基于奇异谱分析与决策树的GIS振动缺陷检测方法研究

Gaoya dianqi
针对气体绝缘开关设备（gas insulated switchgear，GIS）在运行过程中出现的异常振动问题，文中提出了基于奇异谱分析与梯度提升决策树的GIS振动缺陷检测方法。首先通过加速度传感器采集GIS在不同状态下运行的振动信号，采用奇异谱分析的方法处理所获信号，并提取信号的主导分量，再通过时域分析和频域分析方法提取主导分量的特征参量，最后基于梯度提升决策树算法对特征进行递归与分类分析，建立了缺陷诊断模型以得到最终的GIS振动缺陷检测结果。该方法应用在实验室GIS ...
杨景刚, 赵科, 腾云, 李洪涛, 李玉杰, 肖焓艳, 马径坦, 张磊   +7 more
doaj  

[Detection of neurofibroma combining radiomics and ensemble learning]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Liu Y, Wencheng D, Wang Y, Wang Y, Yan Y, Gan K, Pan T.   +6 more
europepmc   +1 more source

[How I treat vasovagal syncope in children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zou RM, Wang C.
europepmc   +1 more source

[Quantitative determination of tetrodotoxin in poisoned biological samples by two-dimensional liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Fang L, Qiu FM, Wang YC.
europepmc   +1 more source

具有偏振互易结构的温度不敏感型全光纤振动传感技术

Gaoya dianqi
文中提出一种具有温度自抑制功能的全光纤、微型化振动传感器，实现电力设备振动信号精确捕获。通过在保偏光纤上制作微型悬臂梁，将外部振动转为两个正交偏振态之间的相位变化，实现对外部振动的测量。为有效抑制环境温度对光纤传感器的干扰，在传感器中形成了偏振互易式光路结构，有效消除温度双折射而引入的相位误差。测试结果表明所提出传感器在100 Hz~6 kHz范围内具有平坦的响应频带，振动测量灵敏度达到87.76 mV/（m·s2），且在25 ℃至60 ℃的温度范围内显示出优异的稳定性 ...
郝宇亮, 梁新钰, 李宣健楠, 张孟炜, 刘鹏, 王青于, 陈宸   +6 more
doaj  

[Application of nanomaterials-enhanced magnetic resonance imaging in precise diagnosis of pan-vascular diseases]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Li Y, Zhang P, Zhang N.
europepmc   +1 more source

[A case report of primary hypomagnesemia with secondary hypocalcemia caused by <i>TRPM6</i> gene variants]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zhou MY, Tang XJ, Lin SX, Chen CF.
europepmc   +1 more source

[Simultaneous determination of 50 veterinary drug residues in fish， shrimp， and crabs using a composite purification column-ultra-performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Deng HD, Ji XF, Xiao YP, Xia Q, Yang H.
europepmc   +1 more source

[Magnetic one-step purification-high performance liquid chromatography-triple quadrupole/composite linear ion trap mass spectrometry for the determination of 54 veterinary drug residues in carp]. [PDF]

Se Pu
Wen YP, Huo WD, Zhang CY, Liu H, Mu YC, Wu LD, Li JC.   +6 more
europepmc   +1 more source