A number of mixing rules are proposed in the literature to predict the dependence of effective material parameters (permittivity and permeability) of composites on frequency and concentration. However, the existing mixing rules for frequency dependence of permeability in magnetic composites typically do not provide satisfactory agreement with measured data. Herein, a simple mixing rule is propo...

The migration of melt through the mantle of the Earth is governed by a third-order nonlinear partial differential equation for the voidage or volume fraction of melt. The partial differential equation depends on the permeability of the medium which is assumed to be a function of the voidage. It is shown that the partial differential equation admits, as well as translations in time and space, ot...

Abstract We investigate the effects of anisotropic permeability and changing boundary conditions upon onset penetrative convection in a porous medium Darcy type Brinkman type. Attention is focussed on critical eigenfunctions which show how many cells will be found layer. The number shown to depend critically ratio vertical horizontal permeability, coefficient, upper condition for velocity may D...

In the present paper, we have studied MHD free convective two dimensional unsteady viscous incompressible flows through a porous effect bounded by an infinite vertical porous plate with constant suction. The permeability of the porous medium fluctuates in time about a constant mean, and the viscosity of fluid is assumed to vary as a linear function of temperature. The flow is permitted under th...

on the permeability of protoplasmic membranes to water. Our experimental tissue was the hypocotyl of Helianthus annuus. We have observed the effect of such factors on the permeability of the cells toward water passing both in the inward and in the outward directions. The rate of entry of water into uniform segments of tissue is a function of A, the difference in diffusion pressure deficit (DPD)...

Formation of biofilm within a porous matrix reduces the pore size and the total open space of the system, altering the porosity and permeability of the medium. This change in the pore size distribution can be quantified by expressing the porous structure with a proper geometrical model. A set of pertinent multispecies biofilm models is used to arrive at the dynamic biofilm thickness distributio...

A new approach to determine the transient period towards steady state pore flow velocity for fluids propagating through porous media under constant pressure condition is presented. The expression relates mean rather than fluid conventional considered when characterizing behavior in media. It based on general, resistance force-velocity relationship, and therefore analogous used calculating perio...

BACKGROUND/AIMS Aquaporin-3 (AQP3), one isoform of water channel family, has been found to be expressed in mouse oocytes. The present study aimed to investigate whether functional AQP3 was expressed in oocytes induced by controlled ovarian hyperstimulation (COH), and whether altered oocyte AQP3 expression was associated with changes in fertilization rate. METHODS Sixty ICR female mice were di...

A phenomenological theory of gravitation is proposed\ based on a pre!relativistic approach to electromagnetism[ The general relativistic\ purely geometric\ spacetime conception is criticized[ Space itself is assumed to have physical substance[ This substance\ the ether\ manifests by its permeability[ Gravitational _elds do not curve space\ but rather distort the ether\ and so a}ect its permeabi...

Sphingosine, at 5-15 mol % total lipids, remarkably increases the permeability to aqueous solutes of liposomal and erythrocyte ghost membranes. The increased permeability cannot be interpreted in terms of leakage occurring at the early stages of a putative membrane solubilization by sphingosine, nor is it due to a sphingosine-induced generation of nonlamellar structures, or flip-flop lipid move...