due to availability of proper materials in landfills (at most parts of iran especially in kahrizak) and also less expenditure of this liner in comparison with other liners it can be count as an acceptable choice. different studies imply that one of the most important factors for soil liner selection is local conditions and also liner compatibility with generated leachate in studied site. hydrau...

THE EFFECT OF REVERSE FLOTATION METHOD ON SILICA SAND AS WATERPROOFING MORTAR. Waterproof fabrication mortar cement by silica sand using reverse flotation (RFS) method was evaluated waterproof absorption coefficient, compressive strength test, attractive and contact angle. RFS is used to replace agent aggregate reduce cost. The aims of this experiment are know the process, ratio between with mo...

We consider solving three-dimensional electromagnetic problems in parameter regimes where the quasi-static approximation applies and the permeability, permittivity, and conductivity may vary significantly. The difficulties encountered include handling solution discontinuities across interfaces and accelerating convergence of traditional iterative methods for the solution of the linear systems o...

objective(s):the objective of this study was to find a stable microemulsion vehicle for transdermal delivery of ibuprofen to improve the skin permeability. materials and methods: microemulsion was prepared using different sorts of oils, surfactants and co-surfactants. pseudo-ternary phase diagrams were used to evaluate the microemulsion domain. the effects of oleic acid and surfactant mixture o...

improving barrier properties through the use of nanocomposites is an important area of research, especially for the food packaging industry. in this work, titanium dioxide (tio2 )/low density poly ethylene (ldpe) nanocomposites were synthesized as the oxygen barrier layers through the co-extrusion process. the oxygen permeability of the nanocomposite with 4% of tio2 decreased for about 16% comp...

Positive coupling effect in gas condensate reservoirs is assessed through a pure theoretical approach. A combination of linear stability analysis and long bubble approximation is applied to describe gas condensate coupled flow and relative permeability, thereof. The role of capillary number in gas condensate flow is clearly expressed through closed formula for relative permeability. While the m...

Mixed matrix membranes (MMMs) are attracting significant interest for pervaporation and gas separation applications. To better comprehend the impact of filler particles within polymer matrices, the species permeation mass transport was theoretically studied by numerical simulation using finite differences. The Fick’s second law of diffusion was solved for a three-dimensional MMM to obtain the c...

Passive permeation into the intestine is influenced by resistance of the unstirred water layer (UWL) and the microvillus membrane. Failure to account for UWL leads to gross underestimation of apparent passive permeability coefficients, and to qualitative errors in the interpretation of the nature of absorptive processes. A previously validated in vitro technique was used 1) to determine the per...

The effects of cigarette smoking on blood to airway pulmonary permeability to the low-molecular-weight solute urea were investigated, in an attempt to evaluate its use as a dilution marker for bronchoalveolar lavage (BAL) studies. Five healthy normal smokers who smoked a cigarette 10 min prior to undergoing a 3 x 60 mL bronchoalveolar lavage (BAL), and five nonsmokers who also underwent BAL but...