Relationship between transport superiority degree and urbanization is not quantified enough in recent researches.Combined with coupling model and coupling coordination model,the spatial analysis technique was applied ...Relationship between transport superiority degree and urbanization is not quantified enough in recent researches.Combined with coupling model and coupling coordination model,the spatial analysis technique was applied to quantitatively analyzing the relationship between transport superiority degree and comprehensive urbanization in eighteen prefecture-level cities in Sichuan from 2000 to 2011. An evaluation index system was constructed,and index weights were obtained using the variation coefficient method. The traffic volume was found to be the main factor contributing to transport superiority degree, and space urbanization was the primary factor influencing comprehensive urbanization. The coupling degree between transport superiority degree and urbanization( CU) was generally higher than the coupling coordination degree( DU) in 2000-2011. DUvaried more significantly than CU. In 2011, Sichuan was divided into five regional types. Based on the above observations, targeted recommendations were developed.展开更多
To investigate the spatial synergy between agricultural development level and transport superiority degree in grain-producing areas of the central Jilin Province and the driving mechanism between them,22 counties in t...To investigate the spatial synergy between agricultural development level and transport superiority degree in grain-producing areas of the central Jilin Province and the driving mechanism between them,22 counties in the central Jilin Province were used as the research units to calculate agricultural development level and transport superiority degree using the entropy weighting method,weighted travel time and raster cost distance.The spatial econometric model was used to analyze the mechanism of the mutual influence between the two.The main conclusions are as follows.1)Agricultural development level around Changchun,the provincial capital city,and in the areas of Changchun-Jilin and Changchun-Gongzhuling is high,whereas the development level of the counties in the southwest is low.2)Transport superiority degree of each county has improved,the overall connectivity of the road networks has been optimized,and the level of transportation accessibility has shown the development trend of‘centralization’,exhibiting the characteristics of proximity diffusion.3)Locally,there is spatial heterogeneity in the mutual driving effects of the two,with six main patterns.4)The theoretical conditions of von Thunen’s agricultural location have changed under the conditions of market economy due to the improvement of the transport networks,the new model of agricultural development,and the changes of the market system.展开更多
Land-use efficiency is low for the urban agglomeration of China.High-speed transportation construction has been an important factor driving land use change.It is criti?cally importa nt to explore the spatial relati on...Land-use efficiency is low for the urban agglomeration of China.High-speed transportation construction has been an important factor driving land use change.It is criti?cally importa nt to explore the spatial relati on ship between the high-speed transportation su?periority degree and land-use efficie ncy.We built a model to evaluate the ben efits of con?venient high-speed transportation using the relative density of highways and the distanee from high-speed rail stations and airports as a metric.We used 42 coun ties of the Shan dong Peninsula urban agglomeration as an example.Land?use efficiency was calculated by a DEA model with capital,labor,economic ben efits and envir on mental ben efits as input and output factors.We examined the spatial relati on ships betwee n high-speed tran sport superiority degree and land-use efficiency and obtained the following results.First,there are significant spatial differe nces in the relati on ships betwee n the high-speed transportati on superiority degree and land-use efficiency.Taking the two major cities of Jinan and Qingdao as the hubs,the core surrounding counties show significant spatial relationship between land-use efficiency and the high-speed transportation superiority degree.Spatial correlation declines as the distance from the hubs in creases.Land-use efficiency is less tha n high-speed tran sportation convenience in areas along the transportation trunks that are distant from the hub cities.Correlation is low in areas that are away from both hub cities and transportation trunk routes.Second,high-speed transportation has a positive relationship with land?use efficiency due to the mechanism of element agglomeration exogenous growth.Third,high-speed transportation facilitates the flow of goods,services and tech no logies between core cities and peripheral cities as space spillover(the hub effect).This alters the spatial pattern of regional land-use efficiency.Fin ally,the short-board effect caused by decreased high-speed tran sport corn struction can be balaneed by highway construction and the proper node layouts of high-speed rail stations and airports,resulting in a well-balaneed spatial pattern of land?use efficiency.展开更多
基于性能的导航(Performance Based Navigation,PBN)飞行程序设计方案的优选对提高终端区空域的容量,空中交通管理工作的质量、效率,甚至飞机的飞行安全至关重要.但在实际操作中,PBN飞行程序设计方案的评估通常由有关专家根据机场的特点...基于性能的导航(Performance Based Navigation,PBN)飞行程序设计方案的优选对提高终端区空域的容量,空中交通管理工作的质量、效率,甚至飞机的飞行安全至关重要.但在实际操作中,PBN飞行程序设计方案的评估通常由有关专家根据机场的特点,依据专业知识及经验来确定优选方案,存在主观性和随意性的缺陷.为了提高PBN飞行程序设计方案优选的合理性和有效性,本文构建了PBN飞行程序设计方案的评价指标体系,建立了基于相对优势度法的区间数多属性评价模型.在该模型中,属性权重及评价指标值均采用区间数形式赋值,这些区间数用于计算备选方案的相对优势度,通过选择最大相对优势度来确定最佳方案.实例证明,所提出的评价模型能充分利用决策信息,有效地解决PBN飞行程序设计方案的优选问题.展开更多
基金Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX2-EW-317)Directional Project of Institute of Mountain Hazards and Environment of Chinese Academy of Sciences(No.SDS-135-1204-04)
文摘Relationship between transport superiority degree and urbanization is not quantified enough in recent researches.Combined with coupling model and coupling coordination model,the spatial analysis technique was applied to quantitatively analyzing the relationship between transport superiority degree and comprehensive urbanization in eighteen prefecture-level cities in Sichuan from 2000 to 2011. An evaluation index system was constructed,and index weights were obtained using the variation coefficient method. The traffic volume was found to be the main factor contributing to transport superiority degree, and space urbanization was the primary factor influencing comprehensive urbanization. The coupling degree between transport superiority degree and urbanization( CU) was generally higher than the coupling coordination degree( DU) in 2000-2011. DUvaried more significantly than CU. In 2011, Sichuan was divided into five regional types. Based on the above observations, targeted recommendations were developed.
基金Under the auspices of Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA19040500)。
文摘To investigate the spatial synergy between agricultural development level and transport superiority degree in grain-producing areas of the central Jilin Province and the driving mechanism between them,22 counties in the central Jilin Province were used as the research units to calculate agricultural development level and transport superiority degree using the entropy weighting method,weighted travel time and raster cost distance.The spatial econometric model was used to analyze the mechanism of the mutual influence between the two.The main conclusions are as follows.1)Agricultural development level around Changchun,the provincial capital city,and in the areas of Changchun-Jilin and Changchun-Gongzhuling is high,whereas the development level of the counties in the southwest is low.2)Transport superiority degree of each county has improved,the overall connectivity of the road networks has been optimized,and the level of transportation accessibility has shown the development trend of‘centralization’,exhibiting the characteristics of proximity diffusion.3)Locally,there is spatial heterogeneity in the mutual driving effects of the two,with six main patterns.4)The theoretical conditions of von Thunen’s agricultural location have changed under the conditions of market economy due to the improvement of the transport networks,the new model of agricultural development,and the changes of the market system.
基金Major Program of National Natural Science Foundation of China,No.41590840,No.41590842.
文摘Land-use efficiency is low for the urban agglomeration of China.High-speed transportation construction has been an important factor driving land use change.It is criti?cally importa nt to explore the spatial relati on ship between the high-speed transportation su?periority degree and land-use efficie ncy.We built a model to evaluate the ben efits of con?venient high-speed transportation using the relative density of highways and the distanee from high-speed rail stations and airports as a metric.We used 42 coun ties of the Shan dong Peninsula urban agglomeration as an example.Land?use efficiency was calculated by a DEA model with capital,labor,economic ben efits and envir on mental ben efits as input and output factors.We examined the spatial relati on ships betwee n high-speed tran sport superiority degree and land-use efficiency and obtained the following results.First,there are significant spatial differe nces in the relati on ships betwee n the high-speed transportati on superiority degree and land-use efficiency.Taking the two major cities of Jinan and Qingdao as the hubs,the core surrounding counties show significant spatial relationship between land-use efficiency and the high-speed transportation superiority degree.Spatial correlation declines as the distance from the hubs in creases.Land-use efficiency is less tha n high-speed tran sportation convenience in areas along the transportation trunks that are distant from the hub cities.Correlation is low in areas that are away from both hub cities and transportation trunk routes.Second,high-speed transportation has a positive relationship with land?use efficiency due to the mechanism of element agglomeration exogenous growth.Third,high-speed transportation facilitates the flow of goods,services and tech no logies between core cities and peripheral cities as space spillover(the hub effect).This alters the spatial pattern of regional land-use efficiency.Fin ally,the short-board effect caused by decreased high-speed tran sport corn struction can be balaneed by highway construction and the proper node layouts of high-speed rail stations and airports,resulting in a well-balaneed spatial pattern of land?use efficiency.
文摘基于性能的导航(Performance Based Navigation,PBN)飞行程序设计方案的优选对提高终端区空域的容量,空中交通管理工作的质量、效率,甚至飞机的飞行安全至关重要.但在实际操作中,PBN飞行程序设计方案的评估通常由有关专家根据机场的特点,依据专业知识及经验来确定优选方案,存在主观性和随意性的缺陷.为了提高PBN飞行程序设计方案优选的合理性和有效性,本文构建了PBN飞行程序设计方案的评价指标体系,建立了基于相对优势度法的区间数多属性评价模型.在该模型中,属性权重及评价指标值均采用区间数形式赋值,这些区间数用于计算备选方案的相对优势度,通过选择最大相对优势度来确定最佳方案.实例证明,所提出的评价模型能充分利用决策信息,有效地解决PBN飞行程序设计方案的优选问题.
