Results 121 to 130 of about 817 (174)

[Principles and suggestions on biosafety protection of biological specimen preservation during prevalence of COVID-19]. [PDF]

open access: yesZhejiang Da Xue Xue Bao Yi Xue Ban, 2020
Zhang X   +6 more
europepmc   +1 more source

[Clinical strategies to prevent falls]. [PDF]

open access: yesLin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2021
Sun Q, Zhang Q, Peng X, Chen Y, Sun H.
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  

[Curcumin improves osteoporosis in type 2 diabetic mice by inhibiting RANBP3L expression]. [PDF]

open access: yesNan Fang Yi Ke Da Xue Xue Bao
Zou X, Zhang X, Li P, Tian R, Lu X.
europepmc   +1 more source

运行与检修问答?

open access: yesGaoya dianqi, 1992
【问】什么叫AIO充气式开关柜? 【答】AIO是英文All in One的缩写,原意是将所有需要的配电装置(如母线、断路器、隔离开关、接地开关、电流和电压互感器等)组装在一个壳体内。这种开关柜是全封闭的,其外壳由角钢做成的框架和3mm厚的钢板焊接而成,内部与通常的开关柜一样分成几个隔室,每一隔室内按需要安装各种配电装置。柜内充以SF6气体,其工作压力视额定电压的不同约为120~150kPa。由于SF6气体的耐电压击穿强度约为空气的2.5~3倍,故每一隔室的尺寸可比通常开关柜的大为缩小 ...
doaj  

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

[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

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