Results 71 to 80 of about 260 (121)
Gaoya dianqi, 2015 电气设备绝缘介质损耗角（介损角）的实时检测,可以为设备的绝缘监测提供可靠依据。采用FFT算法进行介损角测量时,因非同步采样会造成频谱泄漏,从而影响介质损耗角的测量精度。笔者分析了FFT算法的频谱泄漏效应,在此基础上采用了5点加权FFT算法实现对介损角的检测。该算法对信号傅里叶变换后所得序列中5个点进行加权运算,从而减小了频谱泄漏误差,提高了介损角的测量精度。通过仿真给出了该算法在频率波动、3次谐波变化、采样频率变化、采样点数变化、直流分量变化、介损角理论值变化 ...
孙鹏, 杨永越
doaj
Gaoya dianqi, 2019 为了研究负载因素对变压器噪声特性的影响,在半消声室环境中开展了额定负载、过电压、三相不平衡、谐波负载等条件下的油浸式配电变压器的噪声检测,对比研究了不同负载条件下配电变压器的噪声特性。结果表明,变压器噪声水平与过电压、三相不平衡、谐波负载等运行条件密切相关。随着过电压水平、不平衡程度、谐波负载容量的增加,变压器噪声水平明显增大,其中,不平衡谐波负载对变压器噪声水平的影响最为显著,可导致变压器运行噪声增加40 dB（A）以上。由于配电变压器运行条件普遍较为恶劣,在配电变压器噪声控制过程中 ...
吴晓文 +6 more
doaj
Gaoya dianqiC4F7N气体是一种代替SF6的新型电气设备环保绝缘气体。C4F7N气体作为绝缘气体在高压设备中使用时，与SF6设备具有类似的问题，气体的质量影响着设备的正常运行。尤其当C4F7N气体中水分含量超标时，极易引起设备放电降低设备绝缘性能等问题的出现。因此研发针对使用C4F7N气体的运维检测设备就显得尤为重要。文中主要研究可调谐激光红外吸收光谱法对C4F7N中微水含量的定量检测技术。研究了可调谐激光的光谱理论、谐波检测原理和水分的红外吸收特性，介绍了在C4F7N为背景气体的情况下对微水检测精度的影响 ...
张星宇 +4 more
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[Magnetic fluorinated covalent triazine frameworks for efficient extraction of perfluorinated compounds]. [PDF]
Se PuZhang WM +4 more
europepmc +1 more source
[Current research progress status in identifying hepatocellular ballooning degeneration in nonalcoholic steatohepatitis]. [PDF]
Zhonghua Gan Zang Bing Za ZhiXie HR, Wei L.
europepmc +1 more source
[Research progress and future prospects for artificial intelligence in the diagnosis and treatment of fatty liver disease]. [PDF]
Zhonghua Gan Zang Bing Za ZhiLin YY, Liu F, Rao HY.
europepmc +1 more source
[Establishment of a Noninvasive Diagnostic Model for Wilson Disease Using Metallomics and Machine Learning]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanZhou H +6 more
europepmc +1 more source
[Design of a dynamic measurement system for Bl factor spatial distribution of resonant blood viscoelastic sensor]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2023 Qian J, Sun H, Wang B.
europepmc +1 more source
[Diagnosis and treatment of liver diseases in the era of artificial intelligence]. [PDF]
Zhonghua Gan Zang Bing Za ZhiRen LY, Chen DB, Chen HS.
europepmc +1 more source
[Design of flexible wearable sensing systems]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2023 Chen H +6 more
europepmc +1 more source