scholarly journals Urban Network and Regions in China: An Analysis of Daily Migration with Complex Networks Model

2020 ◽  
Vol 12 (8) ◽  
pp. 3208 ◽  
Author(s):  
Wangbao Liu ◽  
Quan Hou ◽  
Zhihao Xie ◽  
Xin Mai
Keyword(s):  
Regional Integration ◽  
Urban Region ◽  
Urban Network ◽  
Capital Cities ◽  
Urban Regions ◽  
Open Platform ◽  
Provincial Capital ◽  
Economic Zones ◽  
Network Metrics ◽  
Map Location

This paper analyzed urban network and regions in China using a complex network model. Data of daily migration among 348 prefectural-level cities from the Baidu Map location-based service (LBS) Open Platform were used to calculate urban network metrics and to delineate boundaries of urban regions. Results show that urban network in China displays an obvious hierarchy in terms of attracting and distributing population and controlling regional interaction. Regional integration has become increasingly prominent, as administrative boundaries and natural barriers no longer have strong impacts on urban connections. Overall, 18 urban regions were identified according to urban connectivity, and the degree of urban connection is higher among cities in the same urban region. Due to geographical proximity and close interaction, several provincial capital cities form an urban region with cities from neighboring provinces instead of those from the same province. Identification of urban region boundaries is of significant importance for sustainable development and policymaking on the demarcation of urban economic zones, urban agglomerations, and future adjustment of provincial administrative boundaries in China.

scholarly journals Arranjos urbano-regionais: uma categoria complexa na metropolização brasileira

2008 ◽  
Vol 10 (2) ◽  
pp. 29 ◽  
Author(s):  
Rosa Moura
Keyword(s):  
Regional Integration ◽  
Sao Paulo ◽  
Urban Region ◽  
Morphological Aspect ◽  
São Paulo ◽  
Urban Network ◽  
Wealth Concentration ◽  
Spatial Category ◽  
The Social ◽  
The One

O objeto de discussão deste texto é uma categoria espacial que transcende as aglomerações urbanas em seu aspecto morfológico; caracteriza-se pela concentração extremada da riqueza, do conhecimento e do poder; enreda-se em um feixe de fluxos de variadas ordens; e se compõe de uma multiescalaridade diversa e conflituosa. Refere-se aos arranjos urbano-regionais, uma configuração fisicamente expandida, de natureza híbrida, sem definir limites precisos, e que revela os principais elos da rede urbana e da inserção regional na divisão social do trabalho. Esses arranjos distribuem-se pelo território nacional, sendo o de maior proeminência o do entorno da metrópole de São Paulo. Posto que é um conceito em construção, está aberto ao debate.Palavras-chave: urbano-regional; arranjos espaciais; metropolização; aglomeração urbana; região urbana. Abstract: A spatial category that transcends the urban agglomerations, in this morphological aspect, which is characterized by wealth concentration, knowledge and power, which inserts numerous flows from varied orders, and that is composed by a diverse and confrontational multiple scalar net is the object of discussion in this text. It refers to the urban-regional arrangements, a configuration physically expanded, with hybrid dimension, without defining precise limits, and that leads the urban network organization and regional integration in the social division of labor. These arrangements appear in the national territory, and the most representative, due his greater prominence, is the one surroundings São Paulo metropolis. As it is a concept in construction, it is important to be placed in the debate.Keywords: urban-regional; spatial arrangements; metropolization; urban agglomeration; urban region.

scholarly journals Epidemiological aspects of toxoplasmosis in schoolchildren residing in localities with urban or rural characteristics within the city of Rio de Janeiro, Brazil

1987 ◽  
Vol 82 (4) ◽  
pp. 475-482 ◽  
Author(s):  
Wilson J. S. Souza ◽  
Sergio G. Coutinho ◽  
Carlos Wilson G. Lopes ◽  
Carlos S. dos Santos ◽  
Nadia M. Neves ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Junior High ◽  
Urban Region ◽  
Risk Of Infection ◽  
Urban Regions ◽  
Significant Difference ◽  
The City ◽  
Undercooked Meat

Immunofluorescence tests (IF) for toxoplasmosis were performed on a total of 608 schoolchildren in elementary and junior high grades. 166 being in the Bonsucesso district (an urban region of Rio de Janeiro) and 442 children from locations within the lowlands of Jacarepaguá (with rural characteristics). All the IF-IgM were nonreactive, whilst 416 schoolchildren (68.4%) were IF-IgG serum-reactive ([greater than or equal to] 1:16). The percentages of serum-reactives in Jacarepaguá were significantly higher than in Bonsucesso, both as regards the total number of schoolchildren (p < 0.001), as also when subdivided according to the age-grades from six to eight years (p < 0.001) or from twelve to fourteen (p < 0.05). Both in Jacarepaguá and in Bonsucesso, the prevalence of reactions in the 12 to 14 year age-grade was significantly greater than in the 6 to 8 year age-grade (p < 0.001 in both cases). Expressively larger prevalences of serum reactions were found in Jacarepaguá among schoolchildren who preferred eating raw or undercooked meat, as well as among those having cats as pets; this occurred equally in the 6 to 8 year and in the 12 to 14 year age-grades. In Bonsucesso, the only significant difference was in the 6 to 8 year age-grades that had cats as pets. Thus, it has been verified that the risk of infection is greater and more precocious in localities with rural characteristics than in urban regions.

Urban Region Function Mining Service Based on Social Media Text Analysis

2021 ◽  
Vol 31 (04) ◽  
pp. 563-586
Author(s):  
Yanchun Sun ◽  
Hang Yin ◽  
Jiu Wen ◽  
Zhiyu Sun
Keyword(s):  
Social Media ◽  
Text Analysis ◽  
Human Activities ◽  
Web Application ◽  
Classification Model ◽  
Urban Region ◽  
Urban Regions ◽  
Social Media Text ◽  
Urban Function ◽  
High Level

Urban region functions are the types of potential activities in an urban region, such as residence, commerce, transportation, entertainment, etc. A service which mines urban region functions is of great value for various applications, including urban planning and transportation management, etc. Many studies have been carried out to dig out different regions’ functions, but few studies are based on social media text analysis. Considering that the semantic information embedded in social media texts is very useful to infer an urban region’s main functions, we design a service which extracts human activities using Sina Weibo ( www.weibo.com ; the largest microblog system in Chinese, similar to Twitter) with location information and further describes a region’s main functions with a function vector based on the human activities. First, we predefine a variety of human activities to get the related activities corresponding to each Weibo post using an urban function classification model. Second, urban regions’ function vectors are generated, with which we can easily do some high-level work such as similar place recommendation. At last, with the function vectors generated, we develop a Web application for urban region function querying. We also conduct a case study among the urban regions in Beijing, and the experiment results demonstrate the feasibility of our method.

scholarly journals Loading Capacity of Sewage Sludge for Forestry Application in Chinese Provincial Capital Cities

2020 ◽  
Vol 12 (18) ◽  
pp. 7551
Author(s):  
Xiaoxia Zhang ◽  
Tonggang Zha ◽  
Jiangang Zhu ◽  
Xiaoping Guo ◽  
Yi Liu
Keyword(s):  
Sewage Sludge ◽  
Scientific Basis ◽  
Mean Value ◽  
Practical Significance ◽  
Loading Capacity ◽  
Capital Cities ◽  
Control Threshold ◽  
Provincial Capital ◽  
Forestry Policies

The application of sewage sludge (SS) in forestry is considered a viable option. However, the long-term application of SS potentially leads to metal accumulation, posing an environmental risk. Understanding the loading capacity of SS for forestry application is therefore of great significance. We used data from published studies and statistical bulletins across 31 provincial capital cities (PCCs) in China to calculate the loading capacity (LC) of SS for forestry application for each PCC. The results are as follows: (1) the mean value of the priority control threshold was 33 t·ha−1·y−1 in 31 PCCs, while the variations ranged from 7 to 91 t·ha−1·y−1 among different PCCs. The priority control thresholds (Smins) of 1/2 PCCs were higher than 30 t·ha−1·y−1 (CJ-T 362-2011). The Smin values of Lanzhou, Tianjin, Hohhot, Shanghai, and Yinchuan were above 55 t·ha−1·y−1, but Smin values of Kunming and Changsha were below 10 t·ha−1·y−1. (2) Cd was the priority control metal in most of the PCCs (27/31), with the exception of Shanghai and Guangzhou (Cu), Beijing (Hg), and Tianjin (Zn). (3) The total loading capacity was 507 million t·y−1, which was 125 times higher than the total quantity of the dry SS (404 × 104 t) for the 31 PCCs. Our results have important practical significance for the use of urban sludge forest land in China and suggest that SS disposal policies need to be tailored to specific regions. We provide a scientific basis to guide the development of national and provincial forestry policies.

scholarly journals Interurban Consumption Flows of Urban Agglomeration in the Middle Reaches of the Yangtze River: A Network Approach

2019 ◽  
Vol 11 (1) ◽  
pp. 268 ◽  
Author(s):  
Lei Wang ◽  
Wenyi Yang ◽  
Yueyun Yuan ◽  
Chengliang Liu
Keyword(s):  
Yangtze River ◽  
Boundary Effect ◽  
Capital City ◽  
Urban Region ◽  
The Yangtze River ◽  
Capital Cities ◽  
Bank Card ◽  
The One ◽  
Network Relationship ◽  
China’S Growth

Network analysis through the lens of traffic flows is becoming the focus of urban-region research in the context of globalization. This study examines the network relationship among 31 cities in the middle reaches of the Yangtze River from the perspective of consumption flow that is serving as an increasingly important engine for China’s growth in general and regional momentum in particular. By tracing the directions and magnitudes of bank card transactions in 2016 as provided by Chinese UnionPay, this paper finds: (1) Three capital cities dominate both outward and inward flow networks and have net outflows, whereas others are featured with inward consumption flow; (2) Most interurban flows occur within provincial boundary, which leaves this whole region without a city-generating global impact; (3) Eight sub-networks composed of adjoining few cities can be further identified that have closer connections to the one containing capital city in that province. Based on these findings related to boundary effect, this paper concludes with a vision for more integrated consumption networks in the context of this region.

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