PURPOSE To measure the effect of hypoxia and eye closure on epithelial permeability to fluorescein (P(dc)) during rigid lens extended wear (EW). METHODS Central corneal thickness (CT) and P(dc) were measured in 42 subjects with an optical pachometer and automated scanning fluorophotometer, respectively. All subjects had been successfully wearing rigid gas-permeable (RGP) lenses on a 6-night E...

Cross-property relations linking the fluid permeability k associated with viscous flow through a porous medium to effective diffusion properties of the medium have recently been derived. Torquato [Phys. Rev. Lett. 64,2644 (1990)] found that k<D4,7, where r is the “mean survival time” associated with steady-state diffusion of “reactants” in the fluid region of diffusion coefficient D and porosit...

An analytical model for a composite material containing magnetic platelets is presented based on the modified asymmetric Bruggeman’s effective medium theory for permeability. The model takes into account crushing of bulk magnetic material and form factors of inclusions.

We present a multiscale Bayesian method to reconstruct the permeability field of a binary medium. The reconstruction is conditioned on measurements of permeability and tracer test breakthrough times, observed at a limited set of locations. The medium consists of a spatially variable distribution of inclusions, which are too small to be individually resolved at the grid scale. The unknown inclus...

Abstract The rate of heat dissipation affects the solidification casting. A controlled cooling is necessary to produce defect-free castings. Sand qualities such as green compression strength, permeability, flow ability, mould hardness, and compactibility play a key role in or uniform across research executed this paper see how these properties affect rate. coarse grain fine sand particle sizes ...

Suspensions of isolated cells were prepared from mouse livers that had been perfused via the portal vein with a buffered medium containing sucrose. The demonstration of metabolic activities in these cells was found to be critically dependent on the composition of the suspending medium. The cells showed considerable metabolic activity in a simple medium containing 0.06 to 0.20 M sucrose, but did...