Results 71 to 80 of about 591 (120)

[Prevalence characteristics of autoimmune thyroid disease in women aged 10-59 years in Qingdao City from 2022 to 2024]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Chen X   +8 more
europepmc   +1 more source

[Research status of dural injury types and repair]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2023
Yang Y, Zhang Y, Lei W.
europepmc   +1 more source

运行中测量金属氧化物避雷器阻性泄漏电流的新方法

open access: yesDianci bileiqi, 1992
对于金属氧化物避雷器运行情况的监视主要靠测量泄漏电流.常用的方法有测量全电流、直流测量阻性电流及泄漏电流的谐波分析.本文提出对泄漏电流进行谐波分析的新方法,采用外偿法把系统电压的谐波产生的三次谐波电流消除,以得到仅由避雷器产生的三次电流谐波.然后再确定阻性电流的三次谐波与总的阻性电流的关系.采用电场测量法间接求得容性三次谐波电流.电位及电流信号输入微处理机处理和显示各种参数,与直流测量法相比,其误差在20~25%之间.
doaj  

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