Fast dating of Yongzheng copper coins in tsing empire by SEM-EDS

Twenty Yongzheng copper coins were fast dat-ing by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%-5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported.     

近两年我国科技考古研究的新进展

根据发表在《文物》、《考古》和《文物保护与考古科学》等学术期刊上的研究论文,综合考察2008—2009年中国科技考古研究的新进展,并结合学科发展的总体趋势展开简要的评述。