Results 61 to 70 of about 413 (109)

电涌保护器之间退耦线圈的选用

Dianci bileiqi, 2012
从直导线和螺线管的电感公式,推导出直导线与空心和磁芯线圈之间的电感等效公式,根据这些公式可以确定退耦线圈的各项参数。结合国家相关规范,举例计算了几种常用导线的等效退耦线圈的参数,分析了电涌保护器之间退耦装置的作用和选用原则。讨论了两种常见雷电脉冲波形对电感的影响,结果表明:首次雷击波形由于波头陡度较大,电流增大会引起线圈的电感量减小;而长时间雷击波形近似于阶跃波,电流可以认为是恒定的,电流对线圈电感量的影响可以忽略。
庞华基, 盛立芳, 傅刚
doaj  

500kV变电站二次设备雷击暂态过电压仿真研究

Dianci bileiqi, 2009
分析超高压变电站二次系统遭受雷击的主要途径,并介绍了其损害机理。在这些机理基础上,针对雷电波不同途径入侵二次设备的情形,建立了等效模型,并进行了初步计算。以南方某500kV变电站电磁环境为例进行了建模,运用电磁暂态过电压软件（ATP）进行了仿真分析,得到如下结论:变电站二次系统线路中串接防雷模块后,电子设备两端的电压能快速减小到1V左右;在接地阻抗较大和变电站电磁环境较强的环境中,电子器件和通讯设施两端的电压远大于承受电压。最后针对目前500kV变电站防雷措施,提出了一些改进意见。
吴将, 李卫国, 马继先, 罗日成
doaj  

[Molecularly imprinted polymers： novel green preparation methods and cutting-edge applications review]. [PDF]

Se Pu
Li F, Jia B, Hu Q, He X, Chen L, Zhang Y.   +5 more
europepmc   +1 more source

[Effects of cold atmosphere plasma treatment on the biological behavior of human gingival fibroblasts]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Zheng M, Ma X, Chen H, Zhao H, Zhang Y, Tan J, Li H, Wang X.   +7 more
europepmc   +1 more source

[POEMS syndrome misdiagnosed as systemic sclerosis: A case report]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Liang J, Zhang X, Yao H.
europepmc   +1 more source

[Diabetic Charcot neuroarthropathy initially misdiagnosed as rheumatoid arthritis and gout: A case report]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Gu J, Li X, Zhao J, Mu R.
europepmc   +1 more source

[Expert consensus on MRI diagnosis of liver fibrosis in chronic hepatitis B (version 2023)]. [PDF]

Zhonghua Gan Zang Bing Za Zhi, 2023
Radiology Committee on Infectious and Inflammatory Disease, Chinese Research Hospital Association;, Radiology of Infection Sub-branch, Radiology Branch, Chinese Medical Association;, Digital Health Committee of China Association for the Promotion of Science and Technology Industrialization;, Committee on Radiology of HIV, Working and Treating Committee of HIV/AIDS and STD Association;, Radiology of Infectious Disease Management Sub-branch, Infectious Disease Management Branch, Hospital Management Association in China;, Beijing Imaging Diagnosis and Treatment Technology Innovation Alliance.   +11 more
europepmc   +1 more source

[Guideline for the diagnosis and treatment of common neonatal diseases in primary healthcare institutions: neonatal seizures (2025)]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Subspecialty Group of Neonatology, Society of Pediatrics, Chinese Medical Association, Editorial Board, Chinese Journal of Contemporary Pediatrics.   +4 more
europepmc   +1 more source

[Exosome separation and analysis based on microfluidics technology and its clinical applications]. [PDF]

Se Pu
Xing YH, Ren XS, Li DH, Liu L.
europepmc   +1 more source

[Research Progress in the Application of Terahertz Spectroscopy and Imaging Technology in Stomatology]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban, 2023
Chen C, Wu FL, Zhou HM, Lei L, Cheng L, Hu T.   +5 more
europepmc   +1 more source