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Hu xiaohui 胡晓辉, Du Debin 杜德斌, « Zhang sanjiao chengshi jian kexue hezuo de shehui wangluo dongtai fenxi 长三角城市间科学合作的社会网络动态分析 », Keji yu jinqi, 2012, Vol. 25, N°1 , p. 13-17.This paper introduced the social network analysis approach to investigate inter-city scientific collaboration between sixteen cities in Yangtze River Delta from 1991 to 2010. We examined the network structure and its developmental mechanism by estimating network density, centrality, average path length and clustering coefficient, to examine the dynamic characteristics of social network development in both microcosmic and macrocosmic perspectives. The conclusions showed that, although the scientific collaboration network has been basically established, the networking process presents significantly spatial unevenness. The driving function of the whole network tends to shift on middle-small cities, but the growing“core-periphery”structure dominated by Shanghai and Nanjing would hinder the further development of scientific collaboration network for a long time.Other articles written by Du Debin in 2012Du Debin 杜德斌, Fan Fei 范斐, Mayahua 马亚华, « Nanhai zhuquan zhengduan di zhanlue taishi ji zhongguo de yingdui fanglue 南海主权争端的战略态势及中国的应对方略 » (Territorial disputes in the South China Sea and China's strategies), Shijie dili yanjiu, Vol. 21, N°2, p. 1-17.Hu Xiaohui 胡晓辉, Du Debin 杜德斌, « Chengshi keji jingzheng li de shengtai wei pingjia yanjiu - yi zhejiang sheng 11 shi wei li 城市科技竞争力的生态位评价研究——以浙江省11市为例 » ( The Niche evaluation on urban Science and technology competitiveness—A case study of cities in Zhejiang province), Keji jinbu yu duice , Vol. 26, N°12, p. 36-40.Huang Liang 黄亮, Du Debin 杜德斌, Wang Baoping 王宝平 , « Quanqiu chanye yanfa de zhuyao tezheng yu fazhan qushi - jiyu quanqiu yanfā 1000 qiang qiye de fenxi 全球产业研发的主要特征与发展趋势——基于全球研发1000强企业的分析 » (The study on the main features and trends of global industrial R&#38;D activities—Base on the analysis of the Global Top 1000 Enterprises in R&#38;D Investment) , Keji jinbu yu duice , Vol. 29, N°9, p. 54-57.The full text of all the articles are available on the CNKI.