Core plasma rotation of both L-mode and H-mode discharges with ion cyclotron range of frequency（ICRF） minority heating（MH） scheme was measured with a tangential X-ray imaging crystal spectrometer on EAST（Experime...Core plasma rotation of both L-mode and H-mode discharges with ion cyclotron range of frequency（ICRF） minority heating（MH） scheme was measured with a tangential X-ray imaging crystal spectrometer on EAST（Experimental Advanced Superconducting Tokamak）.Cocurrent central impurity toroidal rotation change was observed in ICRF-heated L-and H-mode plasmas.Rotation increment as high as 30 km/s was generated at ~1.7 MW ICRF power.Scaling results showed similar trend as the Rice scaling but with significant scattering,especially in L-mode plasmas.We varied the plasma current,toroidal field and magnetic configuration individually to study their effect on L-mode plasma rotation,while keeping the other major plasma parameters and heating unchanged during the scanning.It was found that larger plasma current could induce plasma rotation more efficiently.A scan of the toroidal magnetic field indicated that the largest rotation was obtained for on-axis ICRF heating.A comparison between lower-single-null（LSN）and double-null（DN） configurations showed that LSN discharges rendered a larger rotation change for the same power input and plasma parameters.展开更多
对滇中城市群绿色空间生态系统服务价值(Ecosystem Service value, ESV)进行时空演变及驱动因素的探析,有利于了解区域生态系统服务空间差异,有助于规划者从宏观层面掌握滇中城市群的自然资源情况,合理地制定规划建设策略。研究以滇中...对滇中城市群绿色空间生态系统服务价值(Ecosystem Service value, ESV)进行时空演变及驱动因素的探析,有利于了解区域生态系统服务空间差异,有助于规划者从宏观层面掌握滇中城市群的自然资源情况,合理地制定规划建设策略。研究以滇中城市群49个区、县、市作为研究单元,对2000年、2010年、2019年3期的ESV进行量化,并收集“自然—社会—经济”维度的驱动因子,采用主成分分析与地理加权回归探讨“自然—社会—经济”因素对滇中城市群绿色空间ESV的驱动作用。结果表明:(1) 2000—2019年滇中城市群绿色空间的ESV总体呈现增加状态,一级服务类型中,供给、支持和文化服务小幅度上升,调节服务小幅度下降,二级服务类型中,气候与水文调节对生态系统服务功能的贡献最大,其次为土壤保持、生物多样性和气体调节;(2) 3期ESV空间分布特征较为一致,呈现城市群边缘地区的ESV高于城市群中部地区的ESV的特征;(3)社会因素对滇中城市群绿色空间的ESV的时空演变影响最大、其次为自然因素和经济因素,主要驱动因子为城镇化率、人均GDP、人口密度、森林覆盖率、第二产业占比。(4)城镇化率、人口密度及第二产业占比呈现两极化驱动特征;人均GDP呈现负向驱动特征;森林覆盖率呈现正向驱动特征。综上,近20年滇中城市群绿色空间的ESV增加,其变化主要受社会因素影响。研究可为滇中城市群的可持续发展提供参考。展开更多
基金supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2013GB112004 and 2015GB103002)National Natural Science Foundation of China(Nos.11175208,11305212,11375235,11405212 and 11261140328)+1 种基金the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology(2014FXCX003)Brain Korea 21 Program for Leading Universities&Students(BK21 PLUS)
文摘Core plasma rotation of both L-mode and H-mode discharges with ion cyclotron range of frequency（ICRF） minority heating（MH） scheme was measured with a tangential X-ray imaging crystal spectrometer on EAST（Experimental Advanced Superconducting Tokamak）.Cocurrent central impurity toroidal rotation change was observed in ICRF-heated L-and H-mode plasmas.Rotation increment as high as 30 km/s was generated at ~1.7 MW ICRF power.Scaling results showed similar trend as the Rice scaling but with significant scattering,especially in L-mode plasmas.We varied the plasma current,toroidal field and magnetic configuration individually to study their effect on L-mode plasma rotation,while keeping the other major plasma parameters and heating unchanged during the scanning.It was found that larger plasma current could induce plasma rotation more efficiently.A scan of the toroidal magnetic field indicated that the largest rotation was obtained for on-axis ICRF heating.A comparison between lower-single-null（LSN）and double-null（DN） configurations showed that LSN discharges rendered a larger rotation change for the same power input and plasma parameters.
