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As the global climate warms, the sea ice in the Arctic region is rapidly melting at an unprecedented and unpredictable rate. The economic, resource and strategic value of this region is becoming more and more prominent, and more and more countries are turning their attention to the Arctic, geopolitical issues in the Arctic continue to heat up. In this context, based on the GDELT database, this article uses methods such as mathematical statistics, stratigraphic constrained clustering, and social networks to study the geographic relationship between countries in the global Arctic-related incidents from the second quarter of 2013 to the third quarter of 2022. The results show that: ① During the study period, the cooperation-conflict events among countries in the global "Arctic-related" incidents can be divided into two stages. Compared to the first phase, the second phase saw a decrease in the attention of countries to the Arctic, where cooperation still dominates ②The global network of geopolitical relations between countries involved in Arctic-related events presents a "core-periphery" structure centered on the Arctic countries. As China, the United Kingdom and other Arctic Council observer states pay more attention to the Arctic and participate extensively in affairs, their network status has improved; ③The geopolitical relations between countries in the global Arctic-related incidents have shown a good development trend, but Some of these countries have unequal geographical relations with other countries, especially Russia and other countries; ④The economic, resource and strategic value of the Arctic are prominent, the influence of the geopolitical environment, the increasing militarization of the Arctic region, and the concept of environmental protection in the Arctic have potential effects, promote the evolution of geopolitical relations among countries involved in the global "Arctic-related" incidents. [ABSTRACT FROM AUTHOR]

The super-efficiency SBM model, kernel density estimation and Theil index are used to measure and analyze the temporal and spatial evolution of port efficiency in the Bohai Rim region from 2001 to 2020. Further, the future trend of port efficiency is explored by combining the Theil-Sen median trend, Mann-Kendall test and Hurst index, and finally the driving factors of port efficiency are identified by using the Tobit model. The results show that: (1) The overall port efficiency in the Bohai Rim region shows a fluctuating growth trend, and has experienced two development stages of rapid growth and slow growth successively; (2) The regional differences of port efficiency in the Bohai Rim region are significantly reduced, and the clockwise decreasing pattern of "Shandong-Jinji-Liaoning" is gradually weakened, and the spatial distribution of port efficiency is more balanced. (3) The spatial differences of port efficiency in the Bohai Rim region are mainly from intra-regional differences, and the intra-regional differences are mainly caused by the intra-regional differences in the Shandong region. (4) In the future, there is a risk that the spatial difference of port efficiency in the Bohai Rim region will expand again; (5) Port function, port spatial competition and transportation capacity are the main factors driving the spatio-temporal evolution of port efficiency in the Bohai Rim region, while the level of opening up and hinterland economy are secondary factors. [ABSTRACT FROM AUTHOR]

The comprehensive transportation network of the Pan Arctic is constructed by the nodes of transportation hub cities, and weighted by transportation modes provided by nodes. According to the complex network theory and social network analysis method, the overall characteristics and node centrality in the network are analyzed, and the comprehensive centrality of nodes is calculated by the TOPSIS method to identify the core hub cities in the network. The results show that: (1) Considering the mode of transportation, the Arctic comprehensive transportation network presents the characteristics of complex and orderly, with a small average path length and large clustering coefficient. The scale-free nature of the network is obvious, and its small cosmopolitan nature has been initially revealed; (2) Shanghai, Paris and London are among the top cities in terms of comprehensive centrality. They are the backbone hub cities in the network with rich transportation modes, high coverage of transportation lines, excellent connectivity and hub capacity; (3) There are some limitations in the transportation modes available in some hub cities, which restrict their development momentum in the Arctic comprehensive transportation network. [ABSTRACT FROM AUTHOR]

The port hinterland system is an important force to support regional economic development and spatial structure reshaping, as well as the key to realize the transformation of industrial structure and the optimal allocation of resources. Firstly, based on port hinterland evolution theory and ecological theory, according to the new characteristics, the "Big Tree Theory" of the port hinterland system is proposed from the concept definition, evolution mode, evolution mechanism, etc. This study divides the evolution process of the port-hinterland life spatial structure into 4 stages: port-hinterland tree trunk growth, port-hinterland tree root growth, port-hinterland tree crown growth and the whole tree-shaped life spatial structure in the port-hinterland. Meanwhile, we analyze and describe the evolution mode of port-hinterland in each of the various stages. Secondly, this study builds a system that reveals the dynamic mechanism of the whole tree-shaped life spatial structure in the port-hinterland from the port-hinterland spatial system, the port-hinterland economy system, and the port-hinterland transportation system. Finally, this paper takes Dalian as an empirical case to verify the "Big Tree Theory" of the port hinterland. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Guangdong University of Technology is the property of Journal of Guangdong University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The world liner shipping is divided into 18 shipping regions based on shipping services among 593 ports referring to 17 major liner companies, connections among these shipping regions are counted and the global liner shipping network is built. Hierarchical structure in the network is analyzed through a combination analysis of dominant flows and significant flows. The results indicate the global liner shipping network has a hierarchical structure with 4 layers, where regions in different layers have connections with each other and play different roles in the network. Specifically, regions in the first layer are in the core positions, while regions in the second layer and some regions in the third layer have strong intermediary function. To this end, the core regions (i.e. East Asia and Northwest Europe) are further explored: the comparative shipping distances between the two regions and the others are measured from a perspective of service frequency, and also inter-shipping region relationships are analyzed. [ABSTRACT FROM AUTHOR]