Progress of research on transportation geography in China

Jin, Fen; Wang, Chengjin; Cao, Youhui; Cao, Xiaoshu; Wang, Jiaoe; Dai, Teqi; Jiao, Jingjuan

doi:10.1007/s11442-016-1316-x

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…Therefore, the hot grid and the second highest frequency grid are both taken as the identification basis. The determination of the lower bound and upper bound of the threshold should refer to the flight schedule (Wang and Wang, 2013) and the airport space service distance (Wang, 2015;Jin et al, 2016), and consider the representative and universal significance of the determined hot grids and the second highest frequency grids. When the time threshold and space threshold that were well within the limits, the congestion period duration and the congestion segment range can be identified.…”

Section: Corridor Congestion Identificationmentioning

confidence: 99%

“…The lower bound of time threshold is 15 min, and the upper bound is 60 min (Enea and Porretta, 2012;Wang and Wang, 2013). The lower bound of space threshold is 30 nmi, and the upper bound is 120 nmi (Jin et al, 2016). Finally, the coverage distribution and characteristics of congestion periods and congestion segments in China's corridors are obtained (Figure 4 and Table 1).…”

Section: Congestion Identification Threshold Settingmentioning

confidence: 99%

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China’s corridors-in-the-sky design and space-time congestion identification and the influence of air routes’ traffic flow

Dong

Liu

et al. 2019

J. Geogr. Sci.

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With rapid development of air transportation, the airspace structure of the future will need to be flexible and dynamic to accommodate the increase in traffic demand. The corridors-in-the-sky has become a new technology to support the full exploitation and utilization of airspace resources. This paper proposes a method of designing corridor, identifying congestion state, and analyzing the influence of air routes' traffic flow. From this, we have reached a number of conclusions. (1) The congestion periods present the multi-peak "wavy" scattered distributions and the peaks back-end agglomeration characteristics in the whole day. (2) The congestion segments present the structural characteristics of unbalanced coverage and concentrated distribution to the crossing points. The corridors with high congestion level present as an italic "N-shaped" frame, which presents incomplete penetration of short segments. (3) For the temporal and spatial interaction, there are two types of congestion segments, and there are some common congestion periods in different congestion segments of multiple corridors. The high-density air route plays a relatively decisive role in corridor congestion, and the influence of two directions is unbalanced. This research can provide a basis for the dynamic evaluation of China's airspace resources and corridors construction in the future.

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Section: Corridor Congestion Identificationmentioning

confidence: 99%

Section: Congestion Identification Threshold Settingmentioning

confidence: 99%

China’s corridors-in-the-sky design and space-time congestion identification and the influence of air routes’ traffic flow

Dong

Liu

et al. 2019

J. Geogr. Sci.

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“…R.F. Jin et al [4] studied that natural coagulant had good coagulation activity and stability during 100 days of storage at 4 ℃ and room temperature. After 100 days, the coagulation effect decreased rapidly.…”

Section: Unstable Performancesmentioning

confidence: 99%

“…Coagulant selection is the core of coagulation process. Compared with inorganic and synthetic coagulants, natural organic polymer coagulants have become research hotspot at home and abroad since 1990s because of their many active groups, wide source of raw materials, low price, safety, nontoxicity and good biodegradability advantages [3][4][5][6] . However, the application and commercialization of biodegradable coagulants were limited by the loss of coagulant activity and the instability of coagulants [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Study and Application of Stability of Natural Organic Polymer Coagulants

Meng

2019

E3S Web Conf.

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The natural organic polymer coagulants have attracted much attention due to their safety, non-toxicity, good biodegradability and abundant sources of raw materials. However, the instability of coagulants has restricted their further development and application. In this paper, the main types of coagulants, the research of unstable performances and improvement measures are reviewed. Meanwhile, the applications in water treatment are introduced. Finally, the development prospects of coagulants are prospected in order to provide new ideas for the further study of natural organic polymer coagulants.

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“…The miraculous development of the tourism industry had prominent effects on economic development and urbanization in Lhasa (Tibet) after 2006 due to the running of the QTR [42]. It can be concluded that the cited studies related to the impacts of railway network on accessibility or economic performance focused solely on national level or the mid-eastern regions of China, and the QTR was not included [6,17,43], or the economic effects were not fully addressed. However, assessing the QTR's socioeconomic influences is beneficial to sustainable transport and urban planning in the Third Pole, because it was the first railway constructed in the Third Pole [7,39,40].…”

Section: Literature Reviewmentioning

confidence: 99%

Impacts of the Qinghai–Tibet Railway on Accessibility and Economic Linkage of the Third Pole

Gong

Deng

et al. 2018

Sustainability

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Constructing the Qinghai–Tibet Railway (QTR) was a landmark project and was beneficial to the sustainable development of the Third Pole. To understand the sustainable development of remote regions by the provision of railway, we studied the QTR’s impact on accessibilities and economic linkages for four cities in the Third Pole, Xining, Golmud, Nagqu, and Lhasa, and between these four cities and 29 capital cities in mid-eastern China. First, employing average shortest travel time (ASTT) and weighted average travel time (WATT) as indicators, we calculated the railway-based accessibilities for June 2006 and January 2013. Then, using a gravity model, railway-based economic linkages were determined. The results demonstrate that: (i) ASTT for Xining–Golmud decreased by 4.14 h from June 2006 to January 2013. Both ASTT and WATT indicated that the accessibilities of the four cities and between these four cities and 29 capital cities in mid-eastern China improved significantly, and the spatial disparity in accessibility for the four cities decreased, which increased the balance and sustainability of the transportation system; (ii) the average contribution rate of the QTR to improving economic linkages for six routes among the four cities was 25.29%, with the Xining–Nagqu and Nagqu–Lhasa linkages improving most significantly; (iii) the QTR strengthened economic linkages between the four cities and mid-eastern cities. Because of the QTR, the economic linkages between the four cities and 29 capital cities increased 27.58% on average. The spatial disparity in interurban economic linkages also decreased. Transporting products from Tibet should be promoted to strengthen the sustainability of economic growth.

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Progress of research on transportation geography in China

Cited by 13 publications

References 15 publications

China’s corridors-in-the-sky design and space-time congestion identification and the influence of air routes’ traffic flow

China’s corridors-in-the-sky design and space-time congestion identification and the influence of air routes’ traffic flow

Study and Application of Stability of Natural Organic Polymer Coagulants

Impacts of the Qinghai–Tibet Railway on Accessibility and Economic Linkage of the Third Pole

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