Lagrangian modelling of plankton motion: From deceptively simple random walks to Fokker–Planck and back again

The movement of plankton, either by turbulent mixing or their own inherent motility, can be simulated in a Lagrangian framework as a random walk. Validation of random walk simulations is essential. There is a continuum of mathematically valid stochastic integration schemes upon which random walk simulations depend, each of which lead to radically different macro-scale dynamics as expressed in their corresponding Fokker–Planck equations. In addition, diffusivity is not a unique parameter describing a random walk and its corresponding Fokker–Planck equation. Spatially varying translation speed and turn frequency have different effects on population distributions. Validation requires extra information either in the form of the well-mixed condition for physical diffusion, or in detailed information on the sensing ability, internal state modulation and swimming response for plankton motility.     

电解法处理船舶压载水的可行性研究

通过实验室模拟的一套电解装置处理系统,对电解海水法能否处理船舶压载水,以及电解海水法处理船舶压载水造成二次污染的一些争议进行了实验验证。探索了电解法处理船舶压载水的有效性和在船舶上实施的可行性。