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推求水文要素面平均值(简称面平均值),是一项既重要又常见的工作内容。根据不同资料与站网情况,常用的方法有算术平均法、泰森多边形法和等值线图法。比较而言,等值线图法与人们对水文要素地区分布的描述相一致,因而已成为一种最常用的约定俗成的方法。然而,随着时... 相似文献
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This paper studies the intramolecular photoinduced electron-transfer (PET) of covalent bonded azobenzene-perylene diimide (AZO-PDI) in solvents by using steady-state and time-resolved fluorescence spectroscopy together with ultrafast transient absorption spectroscopic techniques. Fast fluorescence quenching is observed when AZO-PDI is excited at characteristic wavelengths of AZO and perylene moieties. Reductive electron-transfer with transfer rate faster than 1011 s-1 is found. This PET process is also consolidated by femtosecond transient absorption spectra. 相似文献
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