Space Structures Of China's City Network From The Perspective Of Multi-proximity

Urban network research has been an important research frontier in urban research area along the globalization and informatization.Based on the summary of domestic and international network of the city,the research framework of proximity was introduced to city network,according to the connotation of cognition,Institution,organization and geographic proximity,city networks are constructed by the number of in journals,the National Development Zone,the world's top 500 enterprises and the railway passenger transport data,thesis analyse spatial organization of the city network through polycentricity and External-internal index of social network analysis method from two scales of nition and urban Agglomerations.The results were as follows: ⑴The national scale features:The hierarchical and administrative hierarchical characteristics of the network nodes are obvious and the degree of dispersion is large.The four type of network is shown on the top as a sharp Pyramid structure.The top cities in Pyramid are provincial level cities,with the largest discrepant degree between enterprises and innovation networks.On the network level connection,the highest links of all kinds of networks are established between the provincial capital cities,the overall density is not high,and the main structure is more obvious.The network density of the system network is the highest,the density is 0.27,and the second and three are enterprise network,innovation network and high speed rail network.The network structure is presented as a clustered structure centered on the provincial capital(municipality),and the quadrilateral structure with Beijing,Shanghai,Guangzhou and Chengdu as the ends,and the structure that takes the artery of the railway as the backbone.The characteristics of the small network group are not obvious.After dividing the four major blocks,the allocation index is calculated.It is found that the distribution index of enterprises,railways and innovation networks is close to 0,indicating that the characteristics of small groups are not significant,the institutional network is close to-1,and the factions are highly planted.The characteristics of the network multi center are not obvious,and the FPI values of the four types of networks are all close to 0,indicating the characteristics of the centralization of the connection centralization to a small number of cities.⑵The characteristics of urban agglomerationThe main and secondary structure features of the network nodes are significant.Most of them are one and one,and the central city has little change in the status of all kinds of networks.At the level of hierarchy,the vertical connection between cities is stronger than that of the level,and the backbone network is obvious.The level of the provincial capital level cities has the highest level,the provincial capital city and the level cities have a higher vertical connection,and the level of the level city is lower.The urban agglomeration generally forms the "Z","7","N" shaped structure and cluster structure.The multi-center characteristics of urban agglomeration are not significant,and a few cities occupy the dominant position.The FPI values of the five large urban groups are all close to 0,showing a single center network structure.The characteristics of small network groups are not significant.The E-I values of various types of networks at urban agglomeration scale are more than 0,indicating that good chemical reactions are being produced among urban groups.