Due to Donnan exclusion, charged molecules are prohibited from passing through a channel of electrical double layer scale (nanometers), even though the molecules are smaller than the lowest dimension of the channel. To employ this effect for on-chip pre-concentration, an ion channel of nanometer scale has to be introduced. Here we introduced a simple method of generating a fracture (11-250 nm) ...

Water uptake in rock fractures caused by rainfall plays a significant role slope stability analysis. Since the fracture network system has complicated structures and multiple scales, models based on averaged cannot account for these properties. On other hand, model describing single with fractal characteristics surface roughness fails to deal case of at spatial scales. In this study, fracture-ne...

The purpose of these studies was to determine the capillary filtration coefficient of the small intestine of anesthetized dogs by the gravimetric technique. Capillary filtration was produced by elevating venous pressure. Filtration rate increased as venous pressure was increased but the relation between the two was not proportional. At venous pressures greater than 10 mm Hg, filtration rate ten...

to examine hydraulics of lnapls in soil, the retention curves of diesel fuel and water were both determined by hanging column method. the soil retention parameters were obtained based on van genuchten, brooks-corey and campbell’s models. in addition, the soil hydraulic conductivity for both fluids were predicted based on mualem- brooks-corey, burdine- brooks-corey, mualem-van genuchten and camp...

Permeability and capillary pressures are important petrophysical properties. Permeability is one of the most important parameters for reservoir management and development. Capillary pressure data have been widely used in evaluating reservoir rock, sealing capacity, transition zone thickness, pay versus non pay, and absolute and relative permeability. We are working in this study modification tw...

A systematic study was made of capillary pressures in the microvascular bed of the mesentery of the cat. Simultaneous recordings were made with two micropipettes using a modification of the Wiederhielm servo-null system. All of the measurements were then referred to their specific location in the capillary bed by photographically reconstructing discrete networks. Pressures in different capillar...

sturge-weber syndrome (sws) is a very rare congenital disorder that is manifested by facial capillary malformation (port wine stain) which may be associated with capillary – venous malformations affecting many parts such as the brain, eyes facial skin and mucosa and also airways. in this report we present an unusual 28 years old female case of sws that presented with signs and symptoms of sudde...

The purpose of this study was to examine by freeze-fracture the ultrastructure of intercellular junctions between mouse pulmonary endothelial and epithelial cells, and to relate this fine structure to that deduced from previous physiological and ultrastructural studies using tracer techniques. Junctions between capillary endothelial cells consist of one to three interconnected rows of particles...

The water leak-off during hydraulic fracturing in shale gas reservoirs is a complicated transport behavior involving thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. Although many leak-off models have been published, none of the models fully coupled the transient fluid flow modeling with heat transfer, chemical-potential equilibrium and natural-fracture dilation phenome...