Voids and complex cloud patterns have been observed in a radio frequency (rf) discharge dusty plasma system. The structures and behaviors of these patterns were investigated in two- and three-dimensions by shifting an...Voids and complex cloud patterns have been observed in a radio frequency (rf) discharge dusty plasma system. The structures and behaviors of these patterns were investigated in two- and three-dimensions by shifting an il- lumination laser sheet beam up and down. Two-dimensional (2D) circular voids, thin ring voids, and their coexistent voids were observed at the early stage of particle growth. The cor- responding three-dimensional (3D) structures were dome, shell, and their coexistent voids, respectively. The complex fluid-like cloud patterns occurred above the 3D dome voids. The origin and evolution process of the complex dust cloud patterns need a further theoretical explanation.展开更多
文摘利用常德CINRAD S/B多普勒天气雷达获取的雷达资料中的垂直累积液态含水量(VIL)产品分析了柘溪水库库区不同季节降雨云的垂直累积液态含水量和面积值,并将VIL值与降雨关系进行了对比分析。结果表明,积层混合云液态含水量各个量级的覆盖范围均比较广,且最大液态含水量可达30 kg/m2,对应降水区域广、降水总量大,降水效率为20%左右,增雨潜力大,是开展人工增雨的首选云型;多普勒天气雷达作业临界判据为组合反射率因子>25 d Bz、强中心强度>30 d Bz、回波顶高>4.5 km、水平尺度>5 km、VIL>8kg/m2、持续时间>10 min。
文摘Voids and complex cloud patterns have been observed in a radio frequency (rf) discharge dusty plasma system. The structures and behaviors of these patterns were investigated in two- and three-dimensions by shifting an il- lumination laser sheet beam up and down. Two-dimensional (2D) circular voids, thin ring voids, and their coexistent voids were observed at the early stage of particle growth. The cor- responding three-dimensional (3D) structures were dome, shell, and their coexistent voids, respectively. The complex fluid-like cloud patterns occurred above the 3D dome voids. The origin and evolution process of the complex dust cloud patterns need a further theoretical explanation.
