Results 71 to 80 of about 3,433 (125)

[Controlled synthesis of high-capacity bisphenol A molecularly imprinted polymer and its application to the detection of environmental water samples]. [PDF]

Se Pu
Cheng Y, Lin YL, Tian MM.
europepmc   +1 more source

裂纹形状和激振位置对瓷支柱绝缘子振动检测的影响研究

Gaoya dianqi
根据变电站瓷支柱绝缘子带电检测缺陷的实际需求，以220 kV瓷支柱绝缘子为研究对象，深入研究了裂纹长度、裂纹形状和激振位置对瓷支柱绝缘子振动检测的影响。首先阐述了瓷支柱绝缘子内部缺陷振动检测的基本原理，然后建立瓷支柱绝缘子有限元数值分析模型，利用脉冲信号模拟锤击进行瞬态分析，并搭建实验平台进行测试分析。仿真和实验结果表明：裂纹长度越大，在功率谱图上表现为正常频率区间内的峰值降低，故障区间内的峰值所对应固有频率左移，激振点远离裂纹侧时波峰的加速度响应谱值出现小幅度的减小 ...
董国振, 李国维, 王勇, 敬尚前, 宗方蕊, 万书亭   +5 more
doaj  

[A high temporal resolution dynamic T₂*W imaging study based on step oxygen stimulation of rat kidneys]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Sun S, Tao Q, Zhao K, Hu Q, Feng Y.
europepmc   +1 more source

[Determination of tetracyclines in animal muscle tissues by ultra performance liquid chromatography- tandem mass spectrometry]. [PDF]

Se Pu
Chu K, Li JH, Wang QQ, Li XT, Wu S, Chen C.   +5 more
europepmc   +1 more source

[Advances in the assessment and management of voice disorders]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Xu W.
europepmc   +1 more source

[Comprehensive considerations for the diagnosis, treatment, and management of osteogenesis imperfecta]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Lyu XH, Dong J.
europepmc   +1 more source

[Resistance to thyroid hormone syndrome with developmental disorders in two children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Liao LY, Li XF, Zhang XX.
europepmc   +1 more source

220 kV支柱瓷绝缘子元件间连接螺栓松动对振动检测影响的仿真与实验

Dianci bileiqi
根据变电站220 kV支柱瓷绝缘子在实际运行中出现的问题，以两节型号为ZSW-110/10的支柱瓷绝缘子串联组成的220 kV支柱瓷绝缘子为研究对象，深入研究了两元件支柱瓷绝缘子的连接螺栓松动对其振动检测结果的影响。首先建立两元件支柱瓷绝缘子的有限元数值分析模型，利用脉冲信号模拟锤击进行瞬态分析，分别获得了连接螺栓松动与否条件下正常绝缘子、绝缘子下元件故障、上元件故障时拾振点的加速度及其功率谱。然后搭建220 kV支柱瓷绝缘子实验台，完成了故障模拟与实验。理论分析与实测结果表明 ...
张燕珂, 张松洋, 万书亭
doaj  

[Effects of 40 Hz light flicker stimulation on hippocampal-prefrontal neural activity characteristics during working memory tasks in Alzheimer's disease model rats]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Liu S, Wang L, Li S, Xu G.
europepmc   +1 more source

[Determination of 26 herbicide residues in soil， sediment， and surface water samples using modified QuEChERS method combined with ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Zhao L, Ma L, Huang LQ, Chen JB, Zhu WF.
europepmc   +1 more source