离子回旋射频(Ion Cyclotron Range of Frequencies,ICRF)波加热是托卡马克装置上至关重要的辅助加热方式之一。托卡马克装置中国环流三号(HL-3,原名HL-2M)拟安装加热功率为6 MW的ICRF加热系统。本工作利用TRANSP程序,模拟并研究了ICRF...离子回旋射频(Ion Cyclotron Range of Frequencies,ICRF)波加热是托卡马克装置上至关重要的辅助加热方式之一。托卡马克装置中国环流三号(HL-3,原名HL-2M)拟安装加热功率为6 MW的ICRF加热系统。本工作利用TRANSP程序,模拟并研究了ICRF加热的频率和功率对聚变中子产额以及快离子分布的影响。研究结果表明:ICRF的频率和功率对中子产额有显著影响,固定ICRF频率时,中子产额与加热功率成正比关系,而在固定ICRF加热功率的情况下,中子产额的增加幅度显著依赖ICRF的频率,在研究参数范围内,30 MHz的ICRF对中子产额的增加具有最显著的增强作用。快离子分布的模拟结果显示,在考虑ICRF加热后,中性束和ICRF的协同加热机制能够将快离子加热至最高1 MeV,有效地提高了中子产额。此外,基于中子相机诊断的概念对中子信号进行了仿真。结果表明,中子相机能够有效地测量到由ICRF加热导致的中子产额高低和分布剖面的变化,这为将来优化中子相机诊断系统设计和测量中子空间分布提供了一定的参考。展开更多
On the basis of the materials collected from six cruises during 1986～1990 in the Kuroshio and its adjacent waters of the East China Sea, the spatial and temporal changes of zooplankton biomass and the relation to cer...On the basis of the materials collected from six cruises during 1986～1990 in the Kuroshio and its adjacent waters of the East China Sea, the spatial and temporal changes of zooplankton biomass and the relation to certain environmental factors are analysed in this paper. The results indicated that the biomass peaked in autumn, followed by spring and summer and was the lowest in winter. Its horizontal distribution pattern was higher in the continental shelf area than in the Kuroshio area and in the north than in the south of the surveyed area. The higher biomass regions usually occurred in the fronts between different currents and water masses and in the upwelling region of the Kuroshio subsurface water, and were mainly composed of warm-water eurytopic species and tropic oceanic eurytopic species. The relationship between the vertical distribution of zooplankton biomass(Zw ) and water depth(D) might be expressed by the formual LnZw = a + b × D. The biomass was observed higher in the upper 100 m. The positive correlation between the biomass of bait-animal and the abundance of larval and juvenile fishes was significant. In addition, the higher biomass region in the northern study area (in the vicinity of 29°N, 126°E) overlapped the fishing ground of This study is supported by the National Natural Science Foundation of China under the contrast of Grant-49576275 (Astudy of distinction method and mixing modification of water type and water masses in the East China Sea).展开更多
文摘离子回旋射频(Ion Cyclotron Range of Frequencies,ICRF)波加热是托卡马克装置上至关重要的辅助加热方式之一。托卡马克装置中国环流三号(HL-3,原名HL-2M)拟安装加热功率为6 MW的ICRF加热系统。本工作利用TRANSP程序,模拟并研究了ICRF加热的频率和功率对聚变中子产额以及快离子分布的影响。研究结果表明:ICRF的频率和功率对中子产额有显著影响,固定ICRF频率时,中子产额与加热功率成正比关系,而在固定ICRF加热功率的情况下,中子产额的增加幅度显著依赖ICRF的频率,在研究参数范围内,30 MHz的ICRF对中子产额的增加具有最显著的增强作用。快离子分布的模拟结果显示,在考虑ICRF加热后,中性束和ICRF的协同加热机制能够将快离子加热至最高1 MeV,有效地提高了中子产额。此外,基于中子相机诊断的概念对中子信号进行了仿真。结果表明,中子相机能够有效地测量到由ICRF加热导致的中子产额高低和分布剖面的变化,这为将来优化中子相机诊断系统设计和测量中子空间分布提供了一定的参考。
文摘On the basis of the materials collected from six cruises during 1986～1990 in the Kuroshio and its adjacent waters of the East China Sea, the spatial and temporal changes of zooplankton biomass and the relation to certain environmental factors are analysed in this paper. The results indicated that the biomass peaked in autumn, followed by spring and summer and was the lowest in winter. Its horizontal distribution pattern was higher in the continental shelf area than in the Kuroshio area and in the north than in the south of the surveyed area. The higher biomass regions usually occurred in the fronts between different currents and water masses and in the upwelling region of the Kuroshio subsurface water, and were mainly composed of warm-water eurytopic species and tropic oceanic eurytopic species. The relationship between the vertical distribution of zooplankton biomass(Zw ) and water depth(D) might be expressed by the formual LnZw = a + b × D. The biomass was observed higher in the upper 100 m. The positive correlation between the biomass of bait-animal and the abundance of larval and juvenile fishes was significant. In addition, the higher biomass region in the northern study area (in the vicinity of 29°N, 126°E) overlapped the fishing ground of This study is supported by the National Natural Science Foundation of China under the contrast of Grant-49576275 (Astudy of distinction method and mixing modification of water type and water masses in the East China Sea).
