A three-dimensional, three-phase numerical model is presented for simulating the movement of non-aqueous-phase liquids (NAPL's) through porous and fractured media. The model is designed for practical applica:ion to a wide variety of contamination and remediation scenarios involving light or dense NAPL's in heterogeneous subsurface systems. The model formulation is first derived for three-phase ...

Background: Solifenacin succinate is a competitive muscarinic acetylcholine receptor antagonist used in the treatment of overactive bladder with or without urge incontinence. Methods: Liquid chromatography–tandem mass spectrometry method was used for quantification of Solifenacin (SF) in rat plasma. Solifenacin-d5 (SFD5) used as an internal standard. Chromatographic separation was performed Gem...

A method has been developed to infer the wettability of steam-water-rock systems based on the relationship between permeability and capillary pressure by Purcell. The Purcell model was extended to two-phase flow to verify whether the wettability is a function of water saturation. The results calculated using the experimental data showed that the wettability index in the drainage process was gre...

In the past, investigations of phase separation in concentrated polymer solutions centered first of all on the crystallization kinetics (1) and morphology (2) of polymer crystals growing from solutions and, secondly, on the equilibrium thermodynamic properties of liquid-liquid phase separation phenomena (3). Papkov and Yefimova (4) have recently given a classification of different types of phas...

It was recently demonstrated that the Stillinger-Weber silicon undergoes a liquidliquid first-order phase transition deep into the supercooled region (Sastry and Angell, Nature Materials 2, 739 (2003)). Here we study the effects of perturbations on this phase transition. We show that the order of the liquid-liquid transition changes with negative pressure. We also find that the liquid-liquid tr...

Homogeneous liquidliquid microextraction; Flotation assistance; Diazinon; Water samples ABSTRACT: In the present study a sensitive method for extraction of diazinon in water samples was developed using homogeneous liquid-liquid microextraction via flotation assistance (HLLMEFA). Toluene at microliter volume level was used as extraction solvent. The main advantages of method are high enrichment ...

This work reports high-pressure cloud point data for the quaternary system glycerol + olive oil + n-butane + AOT surfactant. The static synthetic method, using a variable-volume view cell, was employed for obtaining the experimental data at pressures up to 27 MPa. The effects of glycerol/olive oil concentration and surfactant addition on the pressure transition values were evaluated in the temp...

The occurrence of pharmaceuticals in the aqueous environment has been widely published but the fate of pharmaceutical residues in the environment continues to attract the attention of the scientific community. Due to the widespread use of non-steroidal anti-inflammatory drugs (NSAIDs), this group of drugs is often detected and determined in surface waters, influent and effluent wastewaters, and...