Results 51 to 60 of about 466 (100)

氧化锌阀片在局部放电作用下的老化

open access: yesDianci bileiqi, 1991
进行了氧化锌阀片老化的研究。已知阀片老化原因如下:①雷电大电流冲击;②操作过电压长电流波;③在工作电压下,温度高;④由于制造缺陷的内部放电及泄漏电流。本研究仅针对最后一个原因。对下列配方阀片进行100h的试验:ZnO97mol%。BiO21.5mol%,MnO2,CoO2及CrO2各0.5mol%。阀片制成φ45×20mm。两端喷金属,侧面无涂料 ...
doaj  

[Analysis of current status and trends of disease burden of knee osteoarthritis in China, 1990-2023]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Liao J, Wu Q, Wu G, Guo B, Zhang J.
europepmc   +1 more source

[Trends in burden of pelvic fractures from 1990 to 2023 and long short-term memory-based insights into future projections]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Fan W   +7 more
europepmc   +1 more source

[Managing refractory wounds in the elderly with the concept of chronic critical illness]. [PDF]

open access: yesZhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Guo GH, Huang SY, Zhu F.
europepmc   +1 more source

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