Results 61 to 70 of about 3,373 (114)

均压电容对双断口真空断路器预击穿特性的影响研究

Gaoya dianqi
双断口真空断路器能够有效提高耐受电压水平，显著降低重燃率，进而提升无功投切性能，具有重要的工程实际意义。文中通过实验分别研究了双断口真空断路器在直流电压下不并联均压电容以及并联均压电容条件下关合时的预击穿特性，包括预击穿开距及其分散性、预击穿电压、预击穿场强，并计算其威布尔分布。结果表明，通过并联合理大小的均压电容（约100 pF）可以使双断口分压更加均匀，从而有效改善双断口真空断路器的预击穿特性。实验结果表明，随着均压电容的增大，当均压电容值超过500 pF后，双断口真空断路器的预击穿特性将会变差 ...
李洪伟, 徐学帅, 熊晓川, 黄博, 马留二   +4 more
doaj  

500 kV输电线路雷击故障仿真分析及类型识别方法

Gaoya dianqi
超高压输电线路架线位置高、架设回数多及输送距离远，其运行中容易受到雷电袭扰，从而威胁系统稳定性和可靠性，不同雷击类型会对线路不同部位产生损伤。针对雷击类型的准确识别问题，提出一种超高压线路雷击类型识别方法。以500 kV同塔双回路鼓型杆塔为例，在ATP-EMTP平台中建立了考虑多因素的仿真模型，分析不同故障工况下雷电绕击、反击的特征，以雷击线路后故障信号通过杆塔入地的暂态信号作为研究对象，提出一种基于改进希尔伯特黄变换的雷击类型识别方法，利用故障信号的固有模态函数（IMF ...
刘家军, 李晨婧, 侯涛, 徐浩焜, 王波   +4 more
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[Regional distribution differences and influencing factors of primary healthcare institutions in China]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Ni P, Wang J, Shi L, Xu L.
europepmc   +1 more source

[Drug repositioning prediction based on dynamic feature learning on heterogeneous graphs]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Zhu H, Guo Y, Xin X, Li C, Zhou D.
europepmc   +1 more source

[Association between Tau protein deposition and brain metabolites: N-acetylaspartate and creatine as potential biomarkers for advanced Alzheimer's disease]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Li X, Zhang Y, Gu Y, Chen N, Qian X, Zhang P, Hao J, Wang F.   +7 more
europepmc   +1 more source

[Neutrophil-derived Microvesicles Regulate DNA Methylation of the <i>LINE1</i> Gene in Human Fibroblast-like Synoviocytes]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Zhao Z, Tang M, Liang Y, Zhang T, Ren Q, Cheng Q, Xiong Y, Ma K, Zhan D.   +8 more
europepmc   +1 more source

白细胞介素8和载脂蛋白E基因多态性与迟发性 阿尔茨海默病的相关分析

Zhongshan Daxue xuebao. Yixue kexue ban, 2010
【目的】 探讨白细胞介素8基因(interleukin-8,IL-8)基因A-251T和载脂蛋白E(ApoE)基因多态性与迟发性阿尔茨海默病(LOAD)的相关性65377;【方法】 采用聚合酶链反应-限制性片段长度多态性方法(PCR-RFLP)观察185例广东汉族人群 (研究组:LOAD患者88例,正常对照组97例) IL-8基因A-251T基因65380;ApoE基因多态性的分布并进行关联分析65377;【结果】 ① IL-8 基因A ...
doaj  

[Role of the SII and SIRI in risk prediction, disease activity assessment, and prog-nostic evaluation of Behçet disease uveitis]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Gao Y, Li Z, Ma M, Wu L.
europepmc   +1 more source

[Interpretable machine learning-based predictive model for assessing abdominal surgery risk and biologic therapy efficacy in CDAI 0 to 1 level Crohn disease patients]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Xie K, Sun Q, Jiang Z, Yao H, Yang L, Zhang Y, Liu H, Yao B, Wu Q, Zhang D, Yuan L.   +10 more
europepmc   +1 more source

[Efficacy and safety of intravenous thrombolysis in patients with mild acute ischemic stroke]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Li X, Zhang X, Wang A, Wang T, Yan Y, Fu J, Zheng J, Lou M, Hu J.   +8 more
europepmc   +1 more source