Results 71 to 80 of about 536 (103)

干式变频变压器磁热力的计算与分析

open access: yesGaoya dianqi
磁浮列车牵引供电系统中的输出变压器,通常在不同频率下运行。为了保证此类变压器的运行可靠性和分析频率变化对其性能参数的影响,文中对一台干式变频变压器在3种运行工况下的磁热力进行了研究。首先,在测量3种频率下铁心材料磁特性的基础上,采用场—路耦合法对各工况下的磁场分布、损耗及短路阻抗进行了计算与对比分析;然后,基于有限体积法分别计算了有无谐波影响下的温度分布与热点温升;最后对其短路性能进行了仿真研究。结果表明,频率变化对铁心磁密、绕组及硅钢片损耗和短路阻抗具有较明显的影响 ...
李欣然   +5 more
doaj  

[Expert Consensus on the Clinical Practice of Child Life Services]. [PDF]

open access: yesSichuan Da Xue Xue Bao Yi Xue Ban
Nursing Group Of Chinese Pediatric Society Chinese Medical Association   +1 more
europepmc   +1 more source

[Spherical measurement-based analysis of gradient nonlinearity in magnetic resonance imaging]. [PDF]

open access: yesSheng Wu Yi Xue Gong Cheng Xue Za Zhi
Yang X   +7 more
europepmc   +1 more source

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