浅谈灵山岛超级堤堤顶特征高程拟定

以灵山岛超级堤工程为研究对象,分析阐述项目中各特征高程取值对堤防的影响,结合工程实际,根据不同频率的设计水位、亲水性、消浪蓄浪、景观要求等因素,对超级堤堤顶特征高程进行选定,可为类似超级堤工程提供参考。     

An overview of air-sea interface process studies

Recent progress in the study of air-sea interface processes for momentum, heat, moisture and mass transfer are reviewed in the present article. Except for turbulent structure, we have analysed the other physical mechanisms occurring in the wave boundary layer, such as the roles of the sea surface state, droplets and bubbles due to wave breaking, which at least partly account for the existing discrepancies between theory and observations. The experiments, both over the ocean and in the laboratory, are described briefly. In conclusion, a few perspective trends in this area are suggested for further investigation. The project is financially supported by the Chinese National Science Foundation.     

Breaking of a Langmuir wave in cold electron-positron-ion plasmas

The space-time evolution of a given density perturbation in cold homogeneous electron-positron-ion plasma is investigated with an assumption of infinitely massive ions by employing a numerical calculation method.The phase-mixing time and wave-breaking time can be effectively distinguished with this method.It is found that an increase of the ratio of equilibrium ion density to equilibrium electron density can attenuate plasma oscillations,leading to a delay in wave breaking.The dependence of the phase-mixing and wave-breaking times on the amplitude of the initial perturbation is also discussed.     

破浪板对FPSO大型LPG储罐晃动的抑制作用

为缓和浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)晃动时液化石油气(Liquefied Petroleum Gas,LPG)大型储罐内的液体介质对壳体的冲击影响,在LPG储罐内设置破浪板.采用计算流体力学(Computational Fluid D...