The Taylor–Couette problem for a rarefied gas is studied numerically by the direct simulation Monte Carlo method. The gas is supposed to be contained in an annular domain, bounded by two coaxial rotating cylinders and top and bottom (specularly reflecting) boundaries, and the flow is assumed to be steady and axisymmetric. Special attention is focused on the effect of rotation of the outer cylin...

Denitrification is commonly measured using in situ benthic chambers or laboratory incubations of sediment cores. These techniques are similar in principle but differ considerably in cost and practicality. Despite widespread use of both techniques, it is uncertain whether they give comparable results. We compared cores and chambers for measuring fluxes (dissolved oxygen [DO], N2, NH4, NO3 and NO...

Controlled oxygen therapy has been developed to treat chronic respiratory failure in patients with hypoxic obstructive airways disease (COAD). In two studies published in the early 1980's long term oxygen therapy (LTOT) improved survival and reduced clinical deterioration over a three year period in such patients (1, 2]. The reduction in mortality was proportionate to the number of hours per da...

A recently developed numerical method for flows with moving boundaries is used for simulating the flow-induced vibration of cylinders. The key feature of the numerical method is that it allows us to simulate flows with moving boundaries on stationary Cartesian grids. The key features of the method are described. The method is used to simulate (a) transverse flow-induced vibration of a cylinder ...

An efficient and accurate method to the problem of planewave scattering from periodic arrays of two circular-cylinders per unit cell is presented. The scattered fields are calculated using the lattice sums characterizing a periodic arrangement of scatterers and the aggregate T -matrix for the isolated two-cylinders system in free space. The cylinders may be of dielectric, perfect conductor, or ...