نتایج جستجو برای: permeability coefficient

تعداد نتایج: 217403  

Journal: : 2023

The settlement rate and pore water pressure dissipation are mainly controlled by the permeability of soil. Both laboratory field tests show that is varied during loading consolidation process. It known process accompanied decrease in void ratio which leads to coefficient permeability. importance on time needs be investigated.This paper takes into account change studies its effect characteristic...

2001
Martin J. Blunt

In the last 3 years there has been a huge increase in the use of pore-scale modeling to study multiphase flow and transport in porous media. Starting from single pore models of fluid arrangements, computations of relative permeability, interfacial area, dissolution rate and many other physical properties have been made. Combined with a realistic description of the pore space, predictive modelin...

2017
Paolo Rocco Francesco Cilurzo Paola Minghetti Giulio Vistoli Alessandro Pedretti

The data presented in this article are related to the article titled "Molecular Dynamics as a tool for in silico screening of skin permeability" (Rocco et al., 2017) [1]. Knowledge of the confidence interval and maximum theoretical value of the correlation coefficient r can prove useful to estimate the reliability of developed predictive models, in particular when there is great variability in ...

Journal: :Stroke 1990
C L Schleien R C Koehler D H Shaffner R J Traystman

Blood-brain barrier integrity during cardiopulmonary resuscitation may be important because of the potential effects of adrenergic agonists administered during arrest on cerebral metabolism and the cerebral vasculature. As an index of blood-brain barrier permeability to small molecules, we measured the brain uptake of [14C]alpha-aminoisobutyric acid during a 10-minute period in 25 anesthetized ...

Journal: :American journal of respiratory and critical care medicine 2005
Diego F Alvarez Judy A King Mary I Townsley

RATIONALE In chronic heart failure, the lung endothelial permeability response to angiotensin II or thapsigargin-induced store depletion is ablated, although the mechanisms are not understood. OBJECTIVES To determine whether the ablated permeability response to store depletion during heart failure was due to impaired expression of store operated Ca2+ channels in lung endothelium. METHODS He...

Journal: :Investigative ophthalmology & visual science 1985
Y Oguro Y Tsukahara I Saito T Kondo

The fluorescein kinetics in the vitreous was simulated with a computer to consider several factors such as permeability of the blood-retinal barrier, outward active transport, plasma fluorescein dynamics, diffusion of fluorescein in the vitreous, and fluorescein leakage from the blood-aqueous barrier. Kinetic vitreous fluorophotometry was performed in normal individuals to estimate the inward a...

2011
Charu Sharma Thirumurthy Velpandian Nihar Ranjan Biswas Niranjan Nayak Rasik Bihari Vajpayee Supriyo Ghose

This study was undertaken to determine in vivo permeability coefficients for fluoroquinolones and to assess its correlation with the permeability derived using reported models in the literature. Further, the aim was to develop novel QSPR model to predict corneal permeability for fluoroquinolones and test its suitability on other training sets. The in vivo permeability coefficient was determined...

Journal: :The Journal of General Physiology 1990
L B Shi D Brown A S Verkman

Vasopressin (VP) increases the water permeability of the toad urinary bladder epithelium by inducing the cycling of vesicles containing water channels to and from the apical membrane of granular cells. In this study, we have measured several functional characteristics of the endosomal vesicles that participate in this biological response to hormonal stimulation. The water, proton, and urea perm...

2003

Measurements of diffusion and partitioning of solutes having molecular weights ranging 180-66 000 in PVA gel membranes with various crosslinking degree were carried out. With increasing solute size or decreasing number of average molecular weight between crosslinks of the membranes, both the solute permeability and partition coefficient decreased. In spite of similar solute sizes, the more hydr...

Journal: :Polimery w medycynie 2008
Sławomir Grzegorczyn Katarzyna Michalska-Małecka Andrzej Slezak

The method of solute permeability coefficient and solute fluxes appointment for the membrane, based on monitoring of changes of conductivity of electrolyte solutions was presented. It was stated that during mechanical stirring of solutions the coefficient of NaCl permeability for microbial cellulose membrane (Biofill) did not depend on configuration of the membrane system and concentrations of ...

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