Results 121 to 130 of about 808 (174)

[Epidemiological investigation of asthenopia and dry eye among visual display terminal workers]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Yang L, Jin X, Huang W, He L, Chen J.
europepmc   +1 more source

[Detection and evaluation of SARS-CoV-2 nucleic acid contamination in corona virus disease 19 ward surroundings and the surface of medical staff's protective equipment]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban, 2020
Yuan XN   +11 more
europepmc   +1 more source

[Advances in risk factors and genetic risk of head and neck squamous cell carcinoma]. [PDF]

open access: yesLin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2022
Tu X, Ren J, Zhao Y.
europepmc   +1 more source

基于分布式地电压测量的开关柜放电溯源方法

open access: yesGaoya dianqi
暂态地电压(TEV)检测是测量开关柜局部放电的常用方法之一,然而由于现场接地系统布置等原因,其信号时常在设备间出现串扰,从而给放电源的定位带来困难。针对该问题,分别构建了单体开关柜与变电站开关室并排开关柜的电磁仿真模型,探究了在放电源未知的条件下单体开关柜暂态地电压信号的最佳测量点,以及多台开关柜共用接地体时的放电源定位方法。仿真结果表明,在放电源位置未知的条件下,柜体正面中下方的测量点位具有最佳的测量效果;对于共用接地体的并排开关柜,各柜对于同一放电脉冲的响应幅值随其与放电源的距离增加而显著衰减 ...
谢荣斌   +4 more
doaj  

[Protective effect of Streptococcus salivarius K12 against Mycoplasma pneumoniae infection in mice]. [PDF]

open access: yesNan Fang Yi Ke Da Xue Xue Bao
Su X   +8 more
europepmc   +1 more source

开关柜常见故障研究

open access: yes工程技术创新与发展
李仲夏, 于丽阳
semanticscholar   +1 more source

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