基于跟踪算法的图像识别方法研究

当今社会处于信息技术高速发展的阶段,随着人工智能的兴起,计算机技术被应用于各个行业的各个方面,其中图像识别技术的运用得到了很大程度的普及,很多个领域都在使用图像识别技术,图像识别技术也越来越成熟,变得越来越多元化,本文旨在深入研究跟踪算法,并结合现在的图像识别技术,探讨并研究基于跟踪算法的图像识别方法的实现以及优化,以及将其应用于智能化教学视频录播系统。     

Pressure and temperature dependent up-conversion properties of Yb~(3+)-Er~(3+) co-doped BaBi_4Ti_4O_(15) ferroelectric ceramics

Yb3+ and Er3+ co-doped BaBi4Ti4O15(BBT) ceramic samples showed brighter up-conversion photoluminescence(UC-PL) under excitation of 980 nm. The monotonous increase of fluorescence intensity ratio(FIR) from 525 to 550 nm with temperature showed that this material could be used for temperature sensing with the maximum sensitivity to be 0.0046 K–1 and the energy difference was 700 cm–1. Moreover, the sudden change of red and green emissions around 400 oC might imply a phase transition. With increasing pressure up to 4 GPa, the PL intensity decreased but was still strong enough. These results illustrated the wide applications of BBT in high temperature and high pressure conditions.     

White light emission of Eu^3＋/Ag co-doped Y2Si2O7

The Eu3+/Ag co-doped rare earth disilicate Y2Si2O7 microcrystal was synthesized by sol-gel method. Through controlling the thermal treatment process of Y2Si2O7:Eu3+/Ag precursor, various phases(amorphous, α, β, γ, δ) were prepared. White light emission was observed under UV light excitation in the samples heavily doped with Ag. The white light was realized by combining the intense red emission of Eu3+, the green emission attributed to the very small molecule-like, non-plasmonic Ag particles(ML-Ag-particles), and the blue emission due to Ag ions. Results demonstrated that Eu3+/Ag co-doped Y2Si2O7 microcrystal could be potentially applied as white light emission phosphors for UV LED chips.     

IGBT集成驱动电路及其功率扩展

针对大容量IGBT的实际应用特点,介绍了EXB841,M57962,HL402,HCPL316J,2SD315A五种常用的集成专用驱动电路,分析了各自的工作原理和过电流保护动作过程,给出了多种适于驱动大容量IGBT的实用扩展电路。