280 Theory 260 Ag 240 802 220 200 180 160 15 20 25 30 35 Grain Size (nm) Comparison with the experimental results of the calculated mean positron lifetime in Ag nanocrystallites as a function of grain size PDF文件使用"pdfFactory”试用版本创建进.fineprint.cnl Comparison with the experimental results of the calculated mean positron lifetime in Ag nanocrystallites as a function of grain size. PDF 文件使用 "pdfFactory" 试用版本创建 Ìwww.fineprint.cn ÿÌ