Homogeneous and isotropic 10 Turbulence 8 Stratified turbulence 6 Big Crunch 4 Continuous time systems 4 Control equipment 4 Cosmology 4 Finite time 4 Homogeneous and isotropic turbulence 4 Kinetic functions 4 Lagrange multipliers 4 Low-energy limit 4 Negative energy density 4 Quadratic polynomial 4 Random walk process 4 Tachyon fields 4 Absorption spectroscopy 2 Boussinesq approximations 2 Clustering mechanism 2 Clustering properties 2 Complex flow 2 Continuous-time random walk models 2 Diffraction 2 Diffraction gratings 2 Diffraction problem 2 Dispersion (waves) 2 Dispersions 2 Efficiency 2 Electromagnetic wave polarization 2 Elementary particle sources 2