【摘要】 采用改进的小波变换对２８例信号平均心电图进行小波分析，得出其频谱标测图，并计算了晚电位检测的一种定量标准———正常因子．研究结果表明，利用小波变换分析晚电位是一种较好的方法，按照正常因子标准，２８例信号平均心电图中包含的６例晚电位阳性全部检出，且没有错检，说明其检测的准确性很高更多还原

【Abstract】 Photoemission measurements have been carried out for Bi 2Sr 2Ca 1-x Pr xCu 2O 8+δ system with conventional x ray photoemission spectroscopy for XPS core level spectra and synchrotron radiation photoemission spectroscopy for valence band. When the Pr doping level increases, no shift is observed in Bi 4f binding energy, Cu 2p slightly shifts to lower binding energy and the intensity ratio of satellite peak to the main peak I s/I m decreases; both Ca 2p and Sr 3d not only shift towards lower binding energy, but broaden as well; O 1s shifts towards the opposite direction, the density of state near Fermi energy becomes smaller in valence band. From Ca 2p spectra, Pr ions are supposed to occupy only Ca sites. It is believed that the shifts of all core levels and valence bands may involve some other mechanisms, such as electrostatic effect, in addition to binding energy referencing effect.更多还原