Linear stability and weakly nonlinear analyses are developed for Rayleigh–Bénard convection in water near 3.98 °C subject to isothermal boundary conditions. The density–temperature relationship (equation of state) is approximated by a cubic polynomial, including linear, quadratic, terms. continuity equation, the Navier–Stokes momentum equation state, energy constitute governing system. analysis...

purpose: to compare keratocyte density between normal and keratoconic corneas in non-contact lens wearers. methods: confocal scanning was performed on 39 corneas of 26 patients with keratoconus and 28 corneas of 14 normal control subjects. none of the cases were contact lens wearer. all individuals underwent ophthalmic examination and computed topography in addition to confocal microscopy. main...