Guangtongxin yanjiu, 2016 为产生全光域UWB（超宽带）一阶和二阶信号,降低光载UWB系统成本,提出了一种基于偏振调制同时光生一阶和二阶UWB信号的方法。将两路极性相反的高斯脉冲信号通过PolM（偏振调制器）相位调制到偏振态正交的两个光载波上,利用PMF（保偏光纤）引入适当的群延时,生成一阶UWB信号。通过PC（偏振控制器）控制输入光信号与PMF主轴所成的角度,产生一对极性相反的一阶UWB信号,并对其中一路进行适当的延时,合成后即可生成二阶UWB信号。所得一阶UWB信号的中心频率为5.36GHz,-10dB绝对带宽为8.96GHz,
张薇, 陈新桥, 柴佳, 黄亚楠
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基于声光调制及RF相位检波的光纤干涉型局部放电超声传感方法研究
Gaoya dianqi变压器状态实时监测对于电力系统的安全稳定运行至关重要，通过检测变压器中局放信号以发现潜在绝缘缺陷，可大大提高电力系统中高压变压器的安全可靠性。文中针对局放超声信号光纤传感稳定性问题，开展光纤超声信号抗干扰及解调技术研究。分析环境噪声对传感系统稳定性的影响机制。为了提高系统稳定性，引入了声光调制器，将待测相位信息转移至高频载波，采用基于RF增益相位检波器的相位硬件解调方案。建立了光纤干涉超声传感系统，消除了传统干涉拓扑存在相位衰落问题对测量结果影响。最终，文中建立实验平台 ...
邢超 +6 more
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Gaoya dianqi, 2019 为解决气体绝缘组合电器（gas insulated switchgear,GIS）内部缺陷局部放电（partial discharge,PD）信号含有噪声的问题,搭建了模拟局部放电环境,采用超高频法（ultra-high frequency,UHF）采集缺陷PD信号。针对UHF PD信号具有周期性窄带噪声与白噪声的特点,提出了基于改进的经验小波（experience wavelet,EWT）与小波变换结合进行UHF PD信号的去噪研究。首先,含噪信号通过EWT预处理分解为多频率的模态函数 ...
秦金飞 +5 more
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Gaoya dianqi, 2009 笔者研制了两种超高频传感器,引进了基于混频技术的信号调理技术,构造了基于AGA-BP神经网络算法的模式识别单元,设计了系统控制显示软件,最终形成完整的测量系统,最后通过变压器和GIS典型缺陷局部放电试验验证了系统性能。
袁鹏 +4 more
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[Development and electrophysiological validation of a temporal interference transcranial magnetic stimulation system for mice]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiCui C, Wang T, Zhang Y, Zheng W, Xu G.
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[Effects of 40 Hz light flicker stimulation on hippocampal-prefrontal neural activity characteristics during working memory tasks in Alzheimer's disease model rats]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiLiu S, Wang L, Li S, Xu G.
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[A high temporal resolution dynamic T<sub>2</sub>*W imaging study based on step oxygen stimulation of rat kidneys]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoSun S, Tao Q, Zhao K, Hu Q, Feng Y.
europepmc +1 more source
[Progresses on temporal interference electromagnetic stimulation for non-invasive deep brain function modulation]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiZhou T, Yu P, Xu Y.
europepmc +1 more source
[Application of multi-scale spatiotemporal networks in physiological signal and facial action unit measurement]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiXu S, Zhang S.
europepmc +1 more source
[Evaluation of an interpretable 12-lead ECG automatic diagnosis model based on deep feature fusion]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoLu X +5 more
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