From the viewpoint of BDS bridge displacement monitoring, which is easily affected by background noise and the calculation of a fixed threshold value in the wavelet filtering algorithm, which is often related to the data length. In this paper, a data processing method of Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN), combined with adaptive threshold wavelet de-noising is proposed. The adaptive threshold wavelet filtering method composed of the mean and variance of wavelet coefficients of each layer is used to de-noise the BDS displacement monitoring data.
View Article and Find Full Text PDFPhys Chem Chem Phys
July 2018
Despite the sustained enthusiastic interest in fluorescent carbon nanodots (FCNDs), it is still challenging to achieve bright and widely tunable solid-state luminescence. Herein, organogels embedded with FCNDs were simply synthesized via a one-pot pyrolysis method. Subsequently, the excitation of a single ultraviolet (UV) excitation line results in tunable solid-state luminescence ranging from blue to red with quantum yields (QYs) >14%.
View Article and Find Full Text PDFGaN green LED was grown on Si (111) substrate by MOCVD. To enhance the quality of InGaN/GaN MQWs, same-temperature (ST) GaN protection layers with different thickness of 8 Å, 15 Å, and 30 Å were induced after the InGaN quantum wells (QWs) layer. Results show that a relative thicker cap layer is benefit to get InGaN QWs with higher In percent at fixed well temperature and obtain better QW/QB interface.
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