Double-null divertor configuration discharge and disruptive heat flux simulation using TSC on EAST

The tokamak simulation code (TSC) is employed to simulate the complete evolution of a disruptive discharge in the experimental advanced superconducting tokamak.The multiplication factor of the anomalous transport coefficient was adjusted to model the major disruptive discharge with double-null divertor configuration based on shot 61 916.The real-time feed-back control system for the plasma displacement was employed.Modeling results of the evolution of the poloidal field coil currents,the plasma current,the major radius,the plasma configuration all show agreement with experimental measurements.Results from the simulation show that during disruption,heat flux about 8 MW m-2 flows to the upper divertor target plate and about 6 MW m-2 flows to the lower divertor target plate.Computations predict that different amounts of heat fluxes on the divertor target plate could result by adjusting the multiplication factor of the anomalous transport coefficient.This shows that TSC has high flexibility and predictability.     

一种基于非采样Contourlet变换的遥感图像融合算法

为使融合后的多光谱图像尽可能保持原多光谱图像光谱特性的同时提高空间质量,提出了一种基于非采样Contourlet变换（NSCT）和多尺度边缘检测的融合算法。介绍了非采样Contourlet变换和多尺度边缘检测;设计了基于多尺度边缘检测、直接替代的高频、低频子带融合规则;用QuickBird卫星高分辨率遥感图像进行仿真实验。实验结果表明该算法能够在保持光谱信息的同时注入更丰富的空间细节信息,优于传统的Wavelet变换法和Contourlet变换法。     

宽视场远距离光学散射成像技术研究进展

散射体内部颗粒分布及折射率分布的不均匀对经过散射体的携带目标信息的光子传播造成干扰,导致直接探测的图像失真。针对该问题,发展了众多的光学散射成像技术,实现了部分特定散射介质条件下的目标成像。介绍了基于弹道光子优化采集的部分传统散射成像技术的原理,还介绍了最新发展的计算散射成像技术的基本原理与技术特点。计算散射成像技术正朝着充分利用大光学厚度散射介质引起的非弹道光子的方向发展,其中基于光学记忆效应和相位恢复的算法、相干衍射成像、叠层迭代引擎等计算成像技术可能适应厚散射介质动态变化、目标非稀疏性等特点,有望应用于宽视场、远距离散射成像领域。