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书刊文摘

open access: yesDianci bileiqi, 1989
荷电率是金属氧化物避雷器的一个重要参数,它理解为可以加在避雷器上的最大工频电压幅值(Uc)与电流为1~5mA时的起始动作电压(Ui)之比.可取用的荷电率越高,避雷器的保护作用和运行可靠性越好.荷电率的值一方面由阀片在长期Uc电压作用下的老化决定的;另一方面由耐受一定时间(tg)的短时工频过电压倍数K的能力决定的.对新的阀片(在115℃荷电率80%1000h下)进行的试验表明,在此期间(阀片的等效寿命),功率损耗变化不超过2.5%,当Uc=0.93kV时损耗值不大于1.3W ...
doaj  

[Clinical efficacy and safety of rituximab in treating renal injury in primary Sjögren syndrome]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Zhao Y   +6 more
europepmc   +1 more source

[Interpretation of the "International consensus on early rehabilitation and nutritional management for infants at high risk of neurological impairment"]. [PDF]

open access: yesZhongguo Dang Dai Er Ke Za Zhi
Wang J   +5 more
europepmc   +1 more source

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