不同酸对界面聚合法合成聚联苯胺性能的影响

采用界面聚合法合成了本征态和樟脑磺酸、b-萘磺酸、盐酸掺及硫酸掺杂聚联苯胺.利用红外光谱(FT-IR)、电子扫描显微镜(SEM)、X射线衍射(XRD)、循环伏安(cyclic voltamogram)等测试方法,对聚合物进行了表征.研究了掺杂酸种类对聚合结构、颗粒形貌、结晶性及电化学性能的影响.结果表明,本征态聚联苯胺呈现微米级棒状分布,具有一定的结晶性和电化学活性,质子酸掺入后其形貌虽无明显变化但尺寸有减少趋势;结晶性有所提高,其中硫酸掺杂聚联苯胺的结晶性最佳;循环伏安行为也有所改善,其中盐酸掺杂聚联苯胺的电化学活性相对较好且其电导率为1.41×10-3S/cm.     

基于RBF神经网络的图像杂波抑制技术

在红外搜索与跟踪系统中,背景杂波抑制效果将直接影响到低信噪比下目标检测及跟踪性能。利用RBF神经网络的非线性映射能力,研究了一种基于RBF神经网络的背景杂波抑制技术。杂波抑制后,残留噪声的高斯性和独立性通过Kendall秩相关法和计算Friedman统计量的方法来进行了验证,杂波抑制效果与常用的Uniform加权函数进行了比较,结果表明所研究思路的可行性和有效性。     

Comparative studies of solid-state synthesized polyaniline doped with inorganic acids

Polyaniline (PANI) salts doped with inorganic acids (HCl, H₂SO₄ and H₃PO₄) were directly synthesized by using solid-state polymerization method. The FTIR spectra, UV–vis absorption spectra and X-ray diffraction patterns were used to characterize the molecular structures of the PANI salts. Voltammetric study was done to investigate the electrochemical behaviors of all these PANI salts. The PANI salts were affected by varying the protonation media (HCl, H₂SO₄ and H₃PO₄). The FTIR and UV–vis absorption spectra revealed that all PANI salts contained the conducting emeraldine salt phase at different oxidation state. The crystallinity of PANI doped with HCl was better than those doped with H₂SO₄ and H₃PO₄. The conductivity of the PANI doped with HCl is the highest among the inorganic acid doped PANI.     

基于时空非参数回归估计的动态杂波抑制技术研究

含有点状运动目标的红外图像序列情况下，在研究杂波运动机理和数理模型的基础上，假定杂波是时空非平稳随机过程，采用时空非参数预测（时域衰减正弦、空域Gabor加权函数）技术来抑制了动态背景杂波。另外，杂波抑制后，残留噪声的高斯性和独立性通过Kendall秩相关法和计算Friedman统计量的方法来进行了验证，其结果表明本文所研究的算法思路的可行性。     

Designing effective and stable S-scheme RGO/AgVO3/AgBr hybrid with enhanced photocatalytic performance

The low separation of photogenerated electron-hole pairs and cycle stability has been the main bottleneck which restricts the development of photocatalytic technology for water purification. Here, RGO/AgVO₃ composites were fabricated by photo-ultrasonic assisted reduction method, and AgBr nanoparticles were assembled on the surface of RGO/AgVO₃ via an in situ ion exchange method. A series of characterization and experimental results indicated that the introduction of RGO influenced the growth of crystal phase for AgVO₃ nanorods, resulting that AgVO₃ nanorods became thicker and shorter with the increase in RGO content. Moreover, RGO could also work as a bridge to promote the migration of electrons, leading different improvement for photocatalytic activity. Furthermore, in situ growth of AgBr on the surface of AgVO₃ nanorods could prevent its agglomeration and exfoliation, thus improving the photocatalytic activity and cycle stability of composites. RGO_1%/AgVO₃/AgBr_30% exhibited excellent photocatalytic activity and stability for methylene blue (MB) degradation due to its unique structure, and its removal ratio reached at 96.2% within 50 min. Meanwhile, the separation of photogenerated electron-hole pairs of AgVO₃ was markedly improved due to the introduction of RGO and AgBr. Based on the trapping experiments and theoretical calculation of band gap, a possible S-scheme photocatalytic mechanism for improved photocatalytic activity was proposed.     

基于粒子滤波和数据关联的多目标跟踪算法

针对图像序列中低信噪比条件下的点状多目标跟踪问题,在已获得各个目标初始信息的基础上,结合粒子滤波和联合概率数据关联(JPDA),研究了一种基于单帧检测的实时多目标跟踪算法.介绍了其基本思想和具体算法实现步骤,并在MATLAB仿真环境下实现了该跟踪算法.实验仿真结果表明,该算法能够准确跟踪作任意轨迹运动的多个点状动目标,具有良好的实时性与准确性.