Recreational services(RS)play a significant role in promoting the harmonious coexistence between humans and nature and enhancing public mental health.This study systematically examined the spatiotemporal evolutionary ...Recreational services(RS)play a significant role in promoting the harmonious coexistence between humans and nature and enhancing public mental health.This study systematically examined the spatiotemporal evolutionary characteristics and coupling relationships between the supply and demand of RS in the Yangtze River Delta(YRD)region from 2010 to 2020.By integrating multi-source data—including land use,big data,and fundamental geographic information—a quantitative indicator system for the potential supply and demand of RS was constructed,and the Geo-detector method was employed to identify key driving factors.The results indicate that:(1)During the study period,spatial mismatches existed between the supply and demand of RS in the YRD,though the overall imbalance tended to decrease;(2)Both high-supply and high-demand areas exhibited significant spatial clustering,with high-supply areas primarily located in the southern part and high-demand areas concentrated in the eastern part,leading to extensive supply deficits in the eastern YRD due to spatial misalignment;and(3)The supply and demand of RS are jointly driven by natural and social factors,with tourism economic activity and urban spatial expansion being the key influencing factors.Based on these findings,we propose that regional differentiated strategies,spatial planning coordination,and data-driven governance should be adopted to enhance the supply-demand balance of RS in the YRD and promote synergistic socio-ecological development.展开更多
The hollow hexagonal pattern involved in surface discharges is firstly investigated in a？dielectric barrier discharge system. The spatiotemporal structures of the pattern are studied using an intensified charge-coupl...The hollow hexagonal pattern involved in surface discharges is firstly investigated in a？dielectric barrier discharge system. The spatiotemporal structures of the pattern are studied using an intensified charge-coupled device and photomultiplier. Instantaneous images taken by an intensified charge-coupled device and optical correlation measurements show that the surface discharges are induced by volume discharges. The optical signals indicate that the discharge filaments constituting the hexagonal frame discharge randomly at the first current pulse or the second pulse, once？or twice. There is no？interleaving of several sub-lattices, which indicates that the ‘memory＇ effect is no longer in force due to surface discharges. By using the emission spectrum method, both the molecule vibration temperature？and electron density of the surface discharges are larger than that of the volume discharges.展开更多
基金The National Natural Science Foundation of China(42271251)。
文摘Recreational services(RS)play a significant role in promoting the harmonious coexistence between humans and nature and enhancing public mental health.This study systematically examined the spatiotemporal evolutionary characteristics and coupling relationships between the supply and demand of RS in the Yangtze River Delta(YRD)region from 2010 to 2020.By integrating multi-source data—including land use,big data,and fundamental geographic information—a quantitative indicator system for the potential supply and demand of RS was constructed,and the Geo-detector method was employed to identify key driving factors.The results indicate that:(1)During the study period,spatial mismatches existed between the supply and demand of RS in the YRD,though the overall imbalance tended to decrease;(2)Both high-supply and high-demand areas exhibited significant spatial clustering,with high-supply areas primarily located in the southern part and high-demand areas concentrated in the eastern part,leading to extensive supply deficits in the eastern YRD due to spatial misalignment;and(3)The supply and demand of RS are jointly driven by natural and social factors,with tourism economic activity and urban spatial expansion being the key influencing factors.Based on these findings,we propose that regional differentiated strategies,spatial planning coordination,and data-driven governance should be adopted to enhance the supply-demand balance of RS in the YRD and promote synergistic socio-ecological development.
基金supported by National Natural Science Foundation of China(Nos.11375051 and 11505044)Key Basic Research Project in the application basic research plan of Hebei Province(No.15961105D)the Research Foundation of Education Bureau of Hebei Province,China(No.LJRC011)
文摘The hollow hexagonal pattern involved in surface discharges is firstly investigated in a？dielectric barrier discharge system. The spatiotemporal structures of the pattern are studied using an intensified charge-coupled device and photomultiplier. Instantaneous images taken by an intensified charge-coupled device and optical correlation measurements show that the surface discharges are induced by volume discharges. The optical signals indicate that the discharge filaments constituting the hexagonal frame discharge randomly at the first current pulse or the second pulse, once？or twice. There is no？interleaving of several sub-lattices, which indicates that the ‘memory＇ effect is no longer in force due to surface discharges. By using the emission spectrum method, both the molecule vibration temperature？and electron density of the surface discharges are larger than that of the volume discharges.
