Results 1 to 10 of about 101 (65)

[Quantitative susceptibility mapping of ultra-high resolution monkey brain in vivo at 9.4 T]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2019
Wen Q, Yang H, Zhong K.
europepmc   +1 more source

双级磁阀可控电抗器振动特性试验研究

Gaoya dianqi, 2018
磁致伸缩效应是变压器、电抗器铁心振动的主要原因,文中基于内能机械能守恒理论,分析了双级磁阀可控电抗器铁心正常运行和含有直流分量时的振动机理,并通过搭建振动试验测量平台,测量了电抗器正常空载情况下铁心上不同点振动加速度,分析了相应的振动特性。进一步对直流偏磁情况下的双级磁阀可控电抗器振动特性进行测量。结果表明:电抗器铁心振动随直流分量的增加而增大,波形畸变程度加剧,各次谐波都呈现增加趋势,且增幅各异。研究结果验证了双极磁阀电抗器铁心直流偏磁振动特征,同时为后续的减振降噪提供了试验基础。
张鹏宁, 李琳, 陈新, 聂京凯
doaj  

[Quantitative magnetic resonance imaging of brain iron deposition: comparison between quantitative susceptibility mapping and transverse relaxation rate (R2*) mapping]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao, 2018
Guan JJ, Feng YQ.
europepmc   +1 more source

开关型消弧激发PT过流的试验与仿真研究

Gaoya dianqi, 2017
随着开关型消弧装置在10 kV配网的推广使用,传统配置下PT（电压互感器）在该装置消弧过程中的过流现象时有发生。为了研究PT过流机理及抑制措施,笔者首先从原理上阐述了开关型消弧中人为单相接地消失过程激发铁磁谐振、低频振荡的机理;其次搭建了10 kV中性点不接地试验平台,在不同的系统电容电流下对4类典型PT进行了单相接地与消失的试验;最后将试验结果与传统仿真结果比较,提出了一种考虑深度饱和下铁心励磁特性情况的计算思路。研究结果表明:即使远离Peterson谐振区域,开关型消弧仍会激发分频谐振或低频振荡 ...
刘衍, 龙国华, 周求宽, 邹阳, 王羽, 陈斌   +5 more
doaj  

地区电网电磁式电压互感器烧损和高压熔丝熔断原因分析

Gaoya dianqi, 2011
中性点不接地系统中,由于电磁式电压互感器（PT）励磁电感的非线性特性,在一定条件下容易产生铁磁谐振过电压,引起PT内绝缘击穿、外绝缘放电及一次侧熔丝熔断,且常因事故处理不及时或事故扩大而造成大面积停电。笔者分析了地区电网中由10kV单相接地故障和35kV单相接地故障引起10kV侧电容传递过电压激发的两起铁磁谐振过电压事故原因,通过实例验证,提出了相应的消谐措施,以减少或避免此类事故的发生。
武万才, 吴志勇, 边疆, 王亚芳
doaj  

[Intelligent watch system for health monitoring based on Bluetooth low energy technology]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2017
Wang J, Guo H, Ren X.
europepmc   +1 more source

[Magnetic fluorinated covalent triazine frameworks for efficient extraction of perfluorinated compounds]. [PDF]

Se Pu
Zhang WM, Liu GC, Fang M, Guo JL, Zhang L.   +4 more
europepmc   +1 more source

[Application of nanomaterials-enhanced magnetic resonance imaging in precise diagnosis of pan-vascular diseases]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Li Y, Zhang P, Zhang N.
europepmc   +1 more source

[Development and electrophysiological validation of a temporal interference transcranial magnetic stimulation system for mice]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Cui C, Wang T, Zhang Y, Zheng W, Xu G.
europepmc   +1 more source

[Research on portable airway impedance monitoring device based on expiratory oscillation]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Kuang Y, Che B, Li X, Liu L, Deng L.
europepmc   +1 more source