The method of radiocarbon dating of series samples unearthed from archaeological sites is briefly explained on both theoretical and practical levels. Some questions raised by archaeologists are answered. It is emphasi...The method of radiocarbon dating of series samples unearthed from archaeological sites is briefly explained on both theoretical and practical levels. Some questions raised by archaeologists are answered. It is emphasized that the method of radiocarbon dating of series samples should be widely used especially when chronological problems in ancient civilization studies need to be solved.展开更多
O437.2 99020966 凝胶化反应全过程的激光光散射跟踪研究=Study ofspan process of gelation by laser light scattering[刊,中]/左榘,牛爱珍,安英丽,何炳林(南开大学吸附分离功能高分子材料国家重点实验室.天津 (300071)),冉少峰,...O437.2 99020966 凝胶化反应全过程的激光光散射跟踪研究=Study ofspan process of gelation by laser light scattering[刊,中]/左榘,牛爱珍,安英丽,何炳林(南开大学吸附分离功能高分子材料国家重点实验室.天津 (300071)),冉少峰,梁德海(南开大学化学系.天津(300071))∥高分子学报.—1998,(4).—419-423在苯乙烯(St)二乙烯苯(DVB)自由基共聚的凝胶化反应过程中定时取样,得到凝胶化点前后及至终点的一系列样品,然后利用激光光散射技术,包括研究散射光强及其角度依赖性的静态光散射和研究散射光频移的动态光散射,表征了这一系列样品的重均分子量M<sub>w</sub>,均方旋转半径R<sub>s</sub>,第二维利系数A<sub>2</sub>及流体力学半径R<sub>h</sub>展开更多
The present report publishes the chronological data of specimens tested by the ^14C Laboratory of the Archaeological Science and Techniques Experiment and Research Center, IA, CASS, in cooperation with the Institute o...The present report publishes the chronological data of specimens tested by the ^14C Laboratory of the Archaeological Science and Techniques Experiment and Research Center, IA, CASS, in cooperation with the Institute of Biophysics, CAS, from 1998 to 2001. These specimens, totaling 230 pieces, come from the following 11 archaeological sites: Erlitou in Yanshi County, Henan (28); Nanzhai in Yichuan County, Henan (10) ; Nianzipo in Changwu County, Shaanxi (21) ; Shang city in Yanshi, Henan (25) ; Shang city in Zhengzhou City, Henan (20+10) ; Xiaoshuangqiao in Zhengzhou City, Henan (5); Yinxu in Anyang City, Henan (43); Zhangjiapo in Chang' an City, Shaanxi (9+12); Mawangcun in Chang'an City, Shaanxi (10) ; Liulihe in Fangshan County, Beijing (25+6) ; and Jin Marquis tomb at Beizhaocun in Quwo County, Shanxi (6).展开更多
文摘The method of radiocarbon dating of series samples unearthed from archaeological sites is briefly explained on both theoretical and practical levels. Some questions raised by archaeologists are answered. It is emphasized that the method of radiocarbon dating of series samples should be widely used especially when chronological problems in ancient civilization studies need to be solved.
文摘O437.2 99020966 凝胶化反应全过程的激光光散射跟踪研究=Study ofspan process of gelation by laser light scattering[刊,中]/左榘,牛爱珍,安英丽,何炳林(南开大学吸附分离功能高分子材料国家重点实验室.天津 (300071)),冉少峰,梁德海(南开大学化学系.天津(300071))∥高分子学报.—1998,(4).—419-423在苯乙烯(St)二乙烯苯(DVB)自由基共聚的凝胶化反应过程中定时取样,得到凝胶化点前后及至终点的一系列样品,然后利用激光光散射技术,包括研究散射光强及其角度依赖性的静态光散射和研究散射光频移的动态光散射,表征了这一系列样品的重均分子量M<sub>w</sub>,均方旋转半径R<sub>s</sub>,第二维利系数A<sub>2</sub>及流体力学半径R<sub>h</sub>
文摘The present report publishes the chronological data of specimens tested by the ^14C Laboratory of the Archaeological Science and Techniques Experiment and Research Center, IA, CASS, in cooperation with the Institute of Biophysics, CAS, from 1998 to 2001. These specimens, totaling 230 pieces, come from the following 11 archaeological sites: Erlitou in Yanshi County, Henan (28); Nanzhai in Yichuan County, Henan (10) ; Nianzipo in Changwu County, Shaanxi (21) ; Shang city in Yanshi, Henan (25) ; Shang city in Zhengzhou City, Henan (20+10) ; Xiaoshuangqiao in Zhengzhou City, Henan (5); Yinxu in Anyang City, Henan (43); Zhangjiapo in Chang' an City, Shaanxi (9+12); Mawangcun in Chang'an City, Shaanxi (10) ; Liulihe in Fangshan County, Beijing (25+6) ; and Jin Marquis tomb at Beizhaocun in Quwo County, Shanxi (6).