نتایج جستجو برای: well diffusion
تعداد نتایج: 1662977 فیلتر نتایج به سال:
plants with hypoglycemic properties are important in the treatment of diabetes. one of the mechanisms in reducing blood glucose is preventing the digestive absorption of glucose. the aim of this study was to evaluate the antioxidant properties of some traditional medicinal plants collected from different regions of iran and their effects on glucose diffusion decrease. the amounts of phenolic co...
Gas reservoirs with low permeability (k<0.1 mD) are among the unconventional reservoirs and are commonly termed as "Tight Gas Reservoirs". In conventional gas reservoirs that have high permeability, the flow of gas is basically controlled by the reservoir permeability and it is calculated using the Darcy equation. In these reservoirs, gas flow due to gas diffusion is ignored compared to Dar...
objective(s):the aim of this study was to improve flowability and compressibility characteristics of starch to use as a suitable excipient in direct compression tabletting. quasi-emulsion solvent diffusion was used as a crystal modification method. materials and methods: corn starch was dissolved in hydrochloric acid at 80˚c and then ethanol as a non-solvent was added with lowering temperature ...
In this paper, we present a new color image regularization method using a rotating smoothing filter. This approach combines a pixel classification method, which roughly determines if a pixel belongs to a homogenous region or an edge with an anisotropic perceptual edge detector capable of computing two precise diffusion directions. Using a now classical formulation, image regularization is here ...
In this paper we extend anisotropic diffusion with a diffusion tensor to be applicable to data that is well modeled by linear models. We focus on its variational theory, and investigate simple discretizations and their performance on synthetic data fulfilling the underlying linear models. To this end, we first show that standard anisotropic diffusion with a diffusion tensor is directly linked t...
وقتی دو گاز مختلف که از نظر شیمیائی بر یکدیگر بی اثر بوده و در یک سیستمی که درجه حرارت و فشار آن ثابت باشد در یکدیگر نفوذ کنند 7 این نفوذ سبب اختلاف درجه حرارت شده . اصطلاحا" این پدیده را اثر گرمائی نفوذ (diffusion thermoeffect) می گویند. دوفر (dufour) در سال 1972 برای اولین بار به این پدیده پی برد و چندی نگذشت که کلاسیوس و والدمن این پدیده را بطور مستقل کشف کردند. این پدیده از آن جهت حائز اهمی...
In this article, a two dimensional pore scale model of polymeric fuel cell, which is promising of a clean and renewable energy production, is presented here. Let reactive gases behave as an ideal gas; inhomogeneous anisotropic structure of the gas diffusion layer, is contemplated as a random generated circular porous media. Lattice Boltzmann method is applied to inquire the fluid flow and mass ...
Antibiotics are the best known products of actinomycete. Over 5,000 antibiotics have been identified from the cultures of Gram positive and Gram-negative organisms, and filamentous fungi, but only about 100 antibiotics have commercially been used to treat human, animal and plant diseases. The genus, Streptomycete, is responsible for the formation of more than 60% of known antibiotics. Bacteri...
Background and Objective: Pseudomonas aeruginosa is one of the most important causes of nosocomial infections. This study was planned to produce a new antimicrobial complex (ceftazidime loaded EDTA) and assess its release kinetic and antimicrobial effects on P. aeruginosa. Materials and Methods: The loading of ceftazidime on EDTA was performed and confirmed by FT-IR spectroscopy. The evaluati...
Abstract Background and Objective: Probiotics are living microorganisms that have beneficial effects on the health of digestive system. The aim of this study was to evaluate the antimicrobial ability of acidic and neutral supernatants (culture supernatant) of lactic acid bacteria against common bacterial pathogens. Meth...
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