The uneven distribution of medical resources has led to increasingly frequent patient mobility;however, the interaction between this phenomenon and the healthcare supply-demand relationship remains underexplored. The ...The uneven distribution of medical resources has led to increasingly frequent patient mobility;however, the interaction between this phenomenon and the healthcare supply-demand relationship remains underexplored. The present study constructed the 2023Cross-City Patient Mobility Network in China using one million patient mobility data records obtained from online healthcare platforms. We applied urban network analysis to uncover mobility patterns and used the coupling coordination degree model to assess healthcare supply-demand relationships before and after patient mobility. Explainable machine learning further revealed the impact of supply-demand coupling on patient mobility. The results indicated the following: Patient mobility followed administrative boundaries, although megacities serve areas beyond provincial borders;The scale of healthcare supply and demand displayed a multi-centric spatial pattern with a general decline from east to west, and these characteristics of demand distribution were further solidified by patient mobility;Cities with low supply-demand coupling and undersupply experienced patient outflows, while cities with high coupling and oversupply attracted them. In turn, patient mobility helped balance healthcare supply and demand, optimising the coupling relationship across cities. Thus, this research not only provides a methodological reference for understanding the interaction between patient mobility and healthcare systems but also offers empirical insights for public health policy.展开更多
Understanding the complex mechanisms underlying agricultural space urbanization is essential for sustainable land management.This study identified the spatiotemporal characteristics of the agricultural space urbanizat...Understanding the complex mechanisms underlying agricultural space urbanization is essential for sustainable land management.This study identified the spatiotemporal characteristics of the agricultural space urbanization from 2000 to 2020 in China’s Yangtze River Economic Belt(YREB)using a kilometer-grid-based approach.By employing the partial least squares structural equation modeling method,the intricate drivers of agricultural space urbanization were investigated.The results revealed that from 2000 to 2020,agricultural space urbanization in the YREB covered an area of 28,198 km^(2),accounting for 84.5%of the total increase in urban space.The partial least squares structural equation modeling analysis revealed regional variations in agricultural space urbanization dynamics.In the western YREB,where urbanization is in its initial stage,natural conditions play a weak and indirect role,whereas policy incentives and socioeconomic growth are equally significant in driving agricultural space urbanization.In the eastern YREB,where urbanization is more saturated,the agricultural space urbanization is less constrained by natural factors,showing a high synergy with socioeconomic development.Conversely,in the central Yangtze River Economic Belt,policy influences surpass socioeconomic factors,whereas unfavorable natural conditions and agricultural development act as key drivers of agricultural space urbanization.This study suggests that enhancing agricultural space urbanization quality requires strengthening region-specific policies,providing targeted support for remote areas,rebalancing policy orientation in rapidly urbanizing regions,and establishing a comprehensive evaluation system to ensure policy rationality.展开更多
The huge migration of rural workers has new characteristics such as the bad order, high degree of concentration, low level of collective action, marginality in social status, unfair treatment, difficult integration of...The huge migration of rural workers has new characteristics such as the bad order, high degree of concentration, low level of collective action, marginality in social status, unfair treatment, difficult integration of the new generation, and the new return trend of rural migrants, which causes ‘urban diseases’ in China. Countermeasures should be taken to develop medium-sized and small cities, integrate the labor market of the city and countryside, provide necessary public services, social security and vocational training, guide the rural migrant workers to return rationally, and help the new generation live in harmony with urban residents.展开更多
Transformation and reform are two major themes of China's urbanization at the present stage.This paper argues that population urbanization,which lags behind land urbanization,is ignored in the process of tradition...Transformation and reform are two major themes of China's urbanization at the present stage.This paper argues that population urbanization,which lags behind land urbanization,is ignored in the process of traditional urbanization.The most important transformation of urbanization is citizenship process for rural migrants who have been semiurbanized.In order to promote urban transformation,a coordinated improving reform must consider the following basic issues:population,financing,land and urban system.展开更多
The water depth in Nansha（南沙） waters,which is located in the southern South China Sea,varies from 200 to 2 500 m,with a deep-water（500 m） area of 500 000 km2.In this region,there are many depositional basins wit...The water depth in Nansha（南沙） waters,which is located in the southern South China Sea,varies from 200 to 2 500 m,with a deep-water（500 m） area of 500 000 km2.In this region,there are many depositional basins with various structural features,prone to the accumulation of organic material.The temperature and pressure conditions in the deep-water environment are suitable for the preservation of gas hydrate.At several sites,we have recognized bottom-simulating reflectors（BSRs） from seismic data.Regional geology analyses show that the Nansha waters may have abundant gas hy-drate prospects,especially in localities such as the Nansha trough and other deep-water basins of the central Nansha waters.展开更多
The iron element in electric arc furnace(EAF)slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase(a solid solution of FeO,MgO,CaO,and MnO).Landfilling EAF slag is stri...The iron element in electric arc furnace(EAF)slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase(a solid solution of FeO,MgO,CaO,and MnO).Landfilling EAF slag is strictly forbidden for environmental consideration because of poisonous Cr^(6+)leaching.The original RO phase could be transformed to a spinel structure,whose specific magnetic susceptibility is much higher than that of other minerals,through hot modification,resulting in significantly increased iron recovery by magnetic separation.Precipitation of spinel crystals encloses chromium,such that iron and chromium could be recovered simultaneously.The chromium in obtained iron concentrates is considerably useful for stainless steel making rather than polluting the environment.As a result,recovering iron and chromium is truly beneficial for cleaner production.Hot modification of EAF slag should be conducted at 1500-1600ºC for at least 60 min to guarantee homogeneous liquid slag.The liquid slag was poured onto an iron mold to obtain modified slag(MS)through air quenching.MS was characterized by thermodynamic analysis,X-ray diffraction,and scanning electron microscopy combined with energy-dispersive spectroscopy to correlate the relationship between mineral structures and iron recovery.The iron recovery rate of MS first increased and then decreased with increasing modifier.It was less than 10%when the modifier addition amount was below 12 wt.%,but it increased rapidly as the modifier addition amount increased from 16 to 24 wt.%,mainly due to spinel formation.The highest iron recovery rate was 81.9%when the modifier amount reached 20 wt.%.Meanwhile,Cr^(6+)was enriched in the spinel phase but was not observed in other minerals.Industrial tests were performed on-site with the modifier ranging from 12 to 18 wt.%because additional heat was not provided during the tests.Results showed that MS with 18 wt.%modifier addition exhibited an iron recovery rate of 61.0%,much higher than that(34.6%)of the original slag.展开更多
On November 12,Chinese Premier Li Keqiang and Singaporean Prime Minister Lee Hsien Loong witnessed representatives of their respective governments sign Protocol to Upgrade the Free Trade Agreement in Singapore.The sig...On November 12,Chinese Premier Li Keqiang and Singaporean Prime Minister Lee Hsien Loong witnessed representatives of their respective governments sign Protocol to Upgrade the Free Trade Agreement in Singapore.The signing of the protocol heralds deepening of economic and trade relations between the two countries-the most important and substantial achievement China has made in the construction of free trade areas.This is also the third upgraded bilateral free trade agreement(FTA)China has signed with foreign partners after agreements with ASEAN and Chile.展开更多
Settlements serve as the tangible carriers of civilization,with historic urban blocks reflecting distinct cultural attributes that are essential for analyzing settlement types,exploring urban form characteristics,and ...Settlements serve as the tangible carriers of civilization,with historic urban blocks reflecting distinct cultural attributes that are essential for analyzing settlement types,exploring urban form characteristics,and refining spatial planning ideologies.Thus,this study focuses on the block as the fundamental morphological unit and introduces a structured research methodology from the typo-morphological perspective,comprising the following stages:Block Morphology Quantification,Block Pattern Types Extraction,Settlement Type Division,and Planning Ideology Discussion.This methodology can efficiently enhance the understanding of morphology and planning ideologies of heritage settlements by applying quantitative approaches to clustering settlements based solely on block pattern.For method validation,37 typical colonial heritage settlements in the Americas is conducted as empirical study through the following process:first,quantifying block morphology;second,identifying block pattern types by K-means clustering;third,applying hierarchical clustering referring to the proportion of block pattern types within each case,resulting in the identification of four categories of"strategic core","corridor node","resource spot"and"overseas new town";lastly,three key planning ideologies-"order","efficiency"and"practicality"—that shaped these settlements are derived from classification results accordingly.As empirical study result,the effectiveness of classifying heritage settlements using block patterns is validated.展开更多
基金Humanities and Social Sciences Fund of Ministry of Education of China,No.24YJA630097National Natural Science Foundation of China,No.42471304。
文摘The uneven distribution of medical resources has led to increasingly frequent patient mobility;however, the interaction between this phenomenon and the healthcare supply-demand relationship remains underexplored. The present study constructed the 2023Cross-City Patient Mobility Network in China using one million patient mobility data records obtained from online healthcare platforms. We applied urban network analysis to uncover mobility patterns and used the coupling coordination degree model to assess healthcare supply-demand relationships before and after patient mobility. Explainable machine learning further revealed the impact of supply-demand coupling on patient mobility. The results indicated the following: Patient mobility followed administrative boundaries, although megacities serve areas beyond provincial borders;The scale of healthcare supply and demand displayed a multi-centric spatial pattern with a general decline from east to west, and these characteristics of demand distribution were further solidified by patient mobility;Cities with low supply-demand coupling and undersupply experienced patient outflows, while cities with high coupling and oversupply attracted them. In turn, patient mobility helped balance healthcare supply and demand, optimising the coupling relationship across cities. Thus, this research not only provides a methodological reference for understanding the interaction between patient mobility and healthcare systems but also offers empirical insights for public health policy.
基金Fellowship Program of the CPSF,No.GZC20231970National Natural Science Foundation of China,No.41871182。
文摘Understanding the complex mechanisms underlying agricultural space urbanization is essential for sustainable land management.This study identified the spatiotemporal characteristics of the agricultural space urbanization from 2000 to 2020 in China’s Yangtze River Economic Belt(YREB)using a kilometer-grid-based approach.By employing the partial least squares structural equation modeling method,the intricate drivers of agricultural space urbanization were investigated.The results revealed that from 2000 to 2020,agricultural space urbanization in the YREB covered an area of 28,198 km^(2),accounting for 84.5%of the total increase in urban space.The partial least squares structural equation modeling analysis revealed regional variations in agricultural space urbanization dynamics.In the western YREB,where urbanization is in its initial stage,natural conditions play a weak and indirect role,whereas policy incentives and socioeconomic growth are equally significant in driving agricultural space urbanization.In the eastern YREB,where urbanization is more saturated,the agricultural space urbanization is less constrained by natural factors,showing a high synergy with socioeconomic development.Conversely,in the central Yangtze River Economic Belt,policy influences surpass socioeconomic factors,whereas unfavorable natural conditions and agricultural development act as key drivers of agricultural space urbanization.This study suggests that enhancing agricultural space urbanization quality requires strengthening region-specific policies,providing targeted support for remote areas,rebalancing policy orientation in rapidly urbanizing regions,and establishing a comprehensive evaluation system to ensure policy rationality.
文摘The huge migration of rural workers has new characteristics such as the bad order, high degree of concentration, low level of collective action, marginality in social status, unfair treatment, difficult integration of the new generation, and the new return trend of rural migrants, which causes ‘urban diseases’ in China. Countermeasures should be taken to develop medium-sized and small cities, integrate the labor market of the city and countryside, provide necessary public services, social security and vocational training, guide the rural migrant workers to return rationally, and help the new generation live in harmony with urban residents.
文摘Transformation and reform are two major themes of China's urbanization at the present stage.This paper argues that population urbanization,which lags behind land urbanization,is ignored in the process of traditional urbanization.The most important transformation of urbanization is citizenship process for rural migrants who have been semiurbanized.In order to promote urban transformation,a coordinated improving reform must consider the following basic issues:population,financing,land and urban system.
基金supported by the National Basic Research Programs of China (973 Programs) (Nos. 2009CB2194 and 2007CB411700)the National Natural Science Fundation of China (Nos. 40976029 and 40676039)+2 种基金the Major Knowledge Innovation Program of Chinese Academy of Sciences (No. kzcx2-yw-203-01)the National Program of Sustaining Science and Technology (No. 2006BAB19B00)the Ministry of Land and Resources, China (Nos. GT-YQ-QQ-2008-1-02 and 2009GYXQ06)
文摘The water depth in Nansha（南沙） waters,which is located in the southern South China Sea,varies from 200 to 2 500 m,with a deep-water（500 m） area of 500 000 km2.In this region,there are many depositional basins with various structural features,prone to the accumulation of organic material.The temperature and pressure conditions in the deep-water environment are suitable for the preservation of gas hydrate.At several sites,we have recognized bottom-simulating reflectors（BSRs） from seismic data.Regional geology analyses show that the Nansha waters may have abundant gas hy-drate prospects,especially in localities such as the Nansha trough and other deep-water basins of the central Nansha waters.
基金supported by Sichuan Province Science_and Technology Program(201904a05020008)Anhui Province Science and Technology Program(2019YFSY0029)the Open Project Funding from State Key Laboratory of Solid Waste Reuse for Building Materials(No.SWR-2017-005).
文摘The iron element in electric arc furnace(EAF)slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase(a solid solution of FeO,MgO,CaO,and MnO).Landfilling EAF slag is strictly forbidden for environmental consideration because of poisonous Cr^(6+)leaching.The original RO phase could be transformed to a spinel structure,whose specific magnetic susceptibility is much higher than that of other minerals,through hot modification,resulting in significantly increased iron recovery by magnetic separation.Precipitation of spinel crystals encloses chromium,such that iron and chromium could be recovered simultaneously.The chromium in obtained iron concentrates is considerably useful for stainless steel making rather than polluting the environment.As a result,recovering iron and chromium is truly beneficial for cleaner production.Hot modification of EAF slag should be conducted at 1500-1600ºC for at least 60 min to guarantee homogeneous liquid slag.The liquid slag was poured onto an iron mold to obtain modified slag(MS)through air quenching.MS was characterized by thermodynamic analysis,X-ray diffraction,and scanning electron microscopy combined with energy-dispersive spectroscopy to correlate the relationship between mineral structures and iron recovery.The iron recovery rate of MS first increased and then decreased with increasing modifier.It was less than 10%when the modifier addition amount was below 12 wt.%,but it increased rapidly as the modifier addition amount increased from 16 to 24 wt.%,mainly due to spinel formation.The highest iron recovery rate was 81.9%when the modifier amount reached 20 wt.%.Meanwhile,Cr^(6+)was enriched in the spinel phase but was not observed in other minerals.Industrial tests were performed on-site with the modifier ranging from 12 to 18 wt.%because additional heat was not provided during the tests.Results showed that MS with 18 wt.%modifier addition exhibited an iron recovery rate of 61.0%,much higher than that(34.6%)of the original slag.
文摘On November 12,Chinese Premier Li Keqiang and Singaporean Prime Minister Lee Hsien Loong witnessed representatives of their respective governments sign Protocol to Upgrade the Free Trade Agreement in Singapore.The signing of the protocol heralds deepening of economic and trade relations between the two countries-the most important and substantial achievement China has made in the construction of free trade areas.This is also the third upgraded bilateral free trade agreement(FTA)China has signed with foreign partners after agreements with ASEAN and Chile.
基金Supported by the National Natural Science Foundation of China(Grant No.42471304)。
文摘Settlements serve as the tangible carriers of civilization,with historic urban blocks reflecting distinct cultural attributes that are essential for analyzing settlement types,exploring urban form characteristics,and refining spatial planning ideologies.Thus,this study focuses on the block as the fundamental morphological unit and introduces a structured research methodology from the typo-morphological perspective,comprising the following stages:Block Morphology Quantification,Block Pattern Types Extraction,Settlement Type Division,and Planning Ideology Discussion.This methodology can efficiently enhance the understanding of morphology and planning ideologies of heritage settlements by applying quantitative approaches to clustering settlements based solely on block pattern.For method validation,37 typical colonial heritage settlements in the Americas is conducted as empirical study through the following process:first,quantifying block morphology;second,identifying block pattern types by K-means clustering;third,applying hierarchical clustering referring to the proportion of block pattern types within each case,resulting in the identification of four categories of"strategic core","corridor node","resource spot"and"overseas new town";lastly,three key planning ideologies-"order","efficiency"and"practicality"—that shaped these settlements are derived from classification results accordingly.As empirical study result,the effectiveness of classifying heritage settlements using block patterns is validated.
