Kelvin-Helmholtz wave clouds are formed when there are two layers of air moving at different speeds and in opposite directions.
当两层空气以不同的速度、相对的方向移动时，便形成了开尔文一亥姆霍兹浪状云(Kelvin - Helmholtz)。
The propagation modes in selfco fiber, which features the laguerre Gauss distributions, are derived by solving the helmholtz wave equation incylindrical coordinates.
从亥姆霍兹方程出发，导出了自聚焦光纤中传导模在圆柱坐标系中的场分布形式，并给出了几个低阶模的分布图。
Helmholtz resonators and quarter wave resonators are studied as the high frequency combustion instabilities suppression devices in liquid rocket engines.
本文针对抑制液体火箭发动机不稳定燃烧的声学装置——赫姆·霍兹声腔和四分之一波长管声腔进行了研究。
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