The objectives of this study were to: (i) examine the efficacy of two sampling techniques for characterizing solute transport under steady-state water flow, (ii) study the variation in transport model parameters with increasing depth of solute leaching, and (iii) perform model discrimination to examine the transport process operative within a field plot. Bromide, NO?, and Clwere applied sequent...

"Breakthrough pain" is a common clinical term that has not been conclusively defined or described. Breakthrough pain is a transitory flare of pain experienced when baseline pain has been reduced to a mild or moderate level. Breakthrough pain may be characterized by its relationship to a fixed around-the-clock (ATC) opioid dose, rapid onset and short duration, precipitating events, predictabilit...

Colloidal particles are an important vector for the transport of contaminants in karst aquifers, characterized by a high degree hydrologic variability. Understanding this heterogeneity and hydrogeological functioning is particular importance water management strategies. Until now, parameters were mostly determined injection solutes or surrogates natural sediments. But suspended easier to analys...

Double-diffusive convection in a micropolar fluid layer heated and soluted from below in the presence of uniform rotation saturating a porous medium is theoretically investigated. An exact solution is obtained for a flat fluid layer contained between two free boundaries. To study the onset of convection, a linear stability analysis theory and normal mode analysis method have been used. For the ...

solute transport in unsaturated porous media can be viewed as a coupled phenomenon with waterand heat transport, together with mechanical behaviour of media. in this paper, solute transport is formulatedmathematically considering heat and water flow in deformable porous media. advection, dispersion anddiffusion of chemical species in the liquid phase are considered. convection and conduction fo...

Abstract Elliptic Curve Cryptography (ECC) is one of the strongest and most efficient cryptographic techniques in modern cryptography. This paper gives following introduction: The introduction cryptography’s development; elliptic curve; principle ECC; horizontal comparison between ECC other types cryptography; breakthrough applications by using a method literature review. study’s findings indic...

Three strains of Pseudomonas fluorescens with different motility rates and adsorption rate coefficients were injected into porous-medium reactors packed with l-mm-diameter glass spheres. Cell breakthrough, time to peak concentration, tailing, and cell recovery were measured at three interstitial pore velocities (higher than, lower than, and much lower than the maximal bacterial motility rate). ...

The partition coefficients (P-values) of certain new potential, stereoselective, reversible, long-acting local anesthetics have been determined in an n-octanol/ phosphate buffer system. These are derivatives of 2-phenoxyethyldialkylamine hydrochloride, and almost all of them are readily soluble in water. Their aqueous solutions have shown different absorption maxima, and these have been use...

BACKGROUND A column sorption study was carried out using calcium alginate gel beads as adsorbent for the removal of boron from aqueous solutions. The breakthrough curve was obtained as a function of pH, initial concentration of boron, feed flow rate, adsorbent mass and column diameter. The breakthrough capacity values and adsorption percentage of calcium alginate gel for boron were...

In the upper crust, where hydraulic gradients are typically ,1 MPa km, advective heat transport is often effective for permeabilities k $ 10 m and advective mass (solute) transport for k $ 10 m. Regional-scale analyses of coupled groundwater flow and heat transport in the upper crust typically infer permeabilities in the range of 10 to 10 m, so that heat advection is sometimes significant and s...