نتایج جستجو برای: permeability coefficient

تعداد نتایج: 217403  

Journal: :E3S web of conferences 2023

The permeability function is one of the key properties in unsaturated soil mechanics and variation parameters water characteristic curve can easily affect matric suction as well infiltration. purpose this research to explore significant effect SWCC on rainfall A gas two phase flow analysis method was conducted investigate influence stable infiltration intensity. Result showed that when saturati...

2008
A. Moreau D. Felbacq

Using complex plane analysis we show that left-handed slab may support either leaky slab waves, which are backward because of negative refraction, or leaky surface waves, which are backward or forward depending on the propagation direction of the surface wave itself. Moreover, there is a general connection between the reflection coefficient of the left-handed slab and the one of the correspondi...

2014
Ali J. Hamad

Aerated lightweight concrete have many advantages when compared with conventional concrete such as advanced strength to weight ratio, lower coefficient of thermal expansion, and good sound insulation as a result of air voids within aerated concrete. This paper is attention to classified of aerated lightweight concrete into foamed concrete and autoclaved concrete. Also, it is exhibits the raw ma...

Journal: :The Journal of Experimental Medicine 1940
Alexander S. Wiener I. Jerome Silverman

The ratio of the titers of various antibodies, namely, hemagglutinins and syphilitic reagin, in the maternal blood to that of the corresponding antibody in the cord blood was found to be relatively constant, falling somewhere between 8 and 16. This figure may be considered the "index of permeability" of human placenta to antibodies, or the coefficient of distribution of antibodies between mater...

Journal: :Anesthesiology 2006
Guochang Hu David E Schwartz Ayesha N Shajahan David J Visintine M Ramez Salem George J Crystal Ronald F Albrecht Stephen M Vogel Richard D Minshall

BACKGROUND Caveolae mediated transendothelial transport of albumin has recently been shown to be the primary mechanism regulating microvascular endothelial albumin permeability. The authors investigated the effects of isoflurane and sevoflurane on pulmonary endothelial albumin permeability and assessed the potential role of the caveolae scaffold protein, caveolin-1, in these effects. METHODS ...

Journal: :Journal of pharmaceutical sciences 2003
Tuncer Değím Jonathan Hadgraft Sibel Ilbasmiş Yalçin Ozkan

Artificial neural network (ANN) analysis was used to predict the skin permeability of selected xenobiotics. Permeability coefficients (log k(p)) were obtained from various literature sources. A previously reported equation, which was shown to be useful in the prediction of skin permeability, uses the partial charges of the penetrants, their molecular weight, and their calculated octanol water p...

2014
R. Gholami A. R. Shahraki M. Jamali Paghaleh

Permeability is a key parameter associated with the characterization of any hydrocarbon reservoir. In fact, it is not possible to have accurate solutions to many petroleum engineering problems without having accurate permeability value. The conventional methods for permeability determination are core analysis and well test techniques. These methods are very expensive and time consuming. Therefo...

Journal: :The Journal of General Physiology 1980
R A Sjodin

Relations are derived that describe the combined effects of electrodiffusion, the Na/K pump, and Na/Ca transport by carrier on the resting membrane potential. Equations are derived that apply to both steady-state and non-steady-state conditions. Some example calculations from the equations are plotted at different permeability coefficient ratios, PK:PCa:PNa. The equations predict a depolarizing...

2017
Sébastien Livi Luanda Chaves Lins Jakub Peter Hynek Benes Jana Kredatusova Ricardo K. Donato Sébastien Pruvost

In this work, phosphonium ionic liquids (ILs) based on tetra-alkylphosphonium cations combined with carboxylate, phosphate and phosphinate anions, were used for organic modification of layered double hydroxide (LDH). Two different amounts (2 and 5 wt %) of the organically modified LDHs were mixed with poly(butylene adipate-co-terephthalate) (PBAT) matrix by melt extrusion. All prepared PBAT/IL-...

2008
Yang-Yih Chen Guan-Yu Chen Chia-Hao Lin

In this paper, the slipping friction is considered in the problem of a progressive wave of real fluids propagating over a permeable bottom.In the interface of soil and fluid, the “no-slip” condition is relaxed and a sliding friction coefficient is introduced. Thus, the slipping effect and the permeability of the bottom on the velocity near the seabed can be studied. The results indicate that th...

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