Results 121 to 130 of about 11,720 (167)

[State-of-the-art in peripheral nerve injury diagnosis and therapy]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Sun J, Chen L.
europepmc   +1 more source

[Establishment and application of key technologies for periodontal tissue regeneration based on microenvironment and stem cell regulation]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Ma B   +10 more
europepmc   +1 more source

电动机合闸时过电压的保护

open access: yesDianci bileiqi, 1990
为了电动机过电压的保护,在其端子处接入阀式避雷器或氧化锌压敏电阻。但是在合闸时由于电容过量充电过程,产生所谓陡波过电压,此时因为避雷器(压敏电阻)的时延,在电动机端子处的电压可能超过保护水平1.5倍。同样情况当避雷器接入时由于电缆的作用,此电压按每米电缆长增大1kV继续上升。提出在操作中压电动机的装置(例如真空开关)
doaj  

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