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中文摘要：
回顾了城市群多中心网络的测度方法,并结合企业总部—分支机构的特性进行了计算方法的进一步完善,在此基础上,对京津冀、长三角、珠三角等3个典型城市群的多中心网络进行了2001—2009年的演化研究。研究发现,三大城市群的跨城企业数量明显增加,城市间总部—分支机构的联系表现得更为频密且逐渐增强,区域一体化程度有较大程度的提高;尽管3个典型城市群的多中心程度在增强,但是城市体系的层级性却有增强的趋势,核心城市的多区位企业集聚现象更为突出,多中心程度的增加主要来自于整体网络的拓扑结构演变。
英文摘要：
Our research firstly review measurement method of polycentric network of city regions and then optimize calculation method combining with characteristics of the headquarter-branch enterprises, on the basis of which, we take evolution research in 2001 to 2009 of polycentric network of three empirical city regions（i.e.Beijing-Tianjin-Hebei city region, the Yangtze River Delta city region and the Pearl River Delta city region）. As results, the number of cross- cityenterprises in three city regions increases obviously. The connection of headquarter- branch enterprises become increasingly enhanced among cities. The degree of regional integration improves deeply. Although the polycentric degree of three empirical city regions enhances, hierarchy in city system strengthens at the same time. The agglomeration of multi- location enterprises in core cities is much prominent. The increase of polycentric degree mainly originates from evolution of topology structures of the entire network.
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