Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Water permeation"”.
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A mathematical model of the airway epithelium: Computational studies of ion and water balance
… to investigate the time course of ion and water transport across airway epithelia. Model variables were intracellular and apical concentrations of sodium, potassium, chloride; apical, basolateral, and transepithelial membrane potentials; cell and apical volumes. Membrane transport processes …
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Material Design and Durability Characterization of “Non-Brittle” Geopolymer
… including shrinkage, elevated temperature, water permeation, and corrosion of embedded steel.
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Novel covalent organic framework (COF) thin-film composite nanofiltration membrane for effective removal of organic compounds from petroleum produced water
Petroleum-produced water is the co-produced aqueous liquid phase along with the oil and/or gas phases during petroleum production operations. It’s considered the largest waste stream associated with oil and gas extraction. The treatment and further reuse of produced water are essential to address …
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The damaging potential of pesticide formulations on human skin
… the pesticides pirimphos methyl and pirimicarb. Water permeation studies demonstrated stratum corneum damage due to emulsifiable concentrate formulations, damage being time and concentration dependent. The major excipient responsible was the divalent anionic surfactant Phenylsulphonate CA. …
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Study on the effect of zeolite rice husk particles on polysulfone membrane
… strength, atomic force microscope (AFM) and water contact angle (CA). The X-ray diffraction (XRD) analysis confirmed the transformation of RHA into zeolite type Y supported with Field Emission Scanning electron microscopy (FESEM) image and Energy dispersive X-ray spectroscopy (EDX). The EDX …
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Development of in situ synthesis of silver polysulfone membrane for water separation
Water treatment using membrane filtration is one of the common methods that can generate higher amount of quality water in future. However, polymer blending method via ex-situ synthesis method shows some weaknesses on membrane modification such as membrane prone to fouling and hydrophobic. In this …
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Putting the Needle to the Haystack: Submolecular Structure Elucidation with Atomic Force Microscopy in Ultra High Vacuum
… possess remarkable properties like selective permeation. Since the exact origin of this extraordinary high water permeation was so far unknown, this work aims at directly imaging pores that shall give these membranes their properties. In doing so, a scheme was devised to classify pore size …
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Studies of Environmental Stress Cracking of High Density Polyethylene Liner in Alkaline Surfactant Polymer Enhanced Oil Recovery Floods
… the ESC behaviour on the HDPEs. Furthermore, the water permeation property of HDPE 3608 was investigated by determining the water vapour transmission (WVT) rate at various temperatures and the specimen thicknesses. A model was developed to illustrate the parametric effects on the water permeating …
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Investigating the adsorption and transport of water in MFI zeolite pores for water desalination
… is limited by the diffusive transport of water across a non-porous polyamide active layer. Alternatively, fabricating a microporous active layer capable of rejecting salt ions while allowing for water transport would increase the permeability while maintaining high salt rejection. Zeolites …
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Bioresorbable Osmotic Pump for Long–term Contraception
… the high osmolality of the osmotic engine causes water flux into the pump through a semi-permeable membrane, and the increased internal pressure from the expansion causes the drug formulation to be pushed out through the orifice on the other side. To our best knowledge, bioresorbable osmotic pump …
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Mikrostruktur-basierte Simulation des Feuchtetransports in Zement- und Sandstein
… transport processes considered comprise the water permeation, the water diffusion and the capillary absorption. Three hardened cement pastes with two different water to cement ratios, and two sandstones, a Fontainebleau and a Bentheimer sandstone serve as examples of capillary-porous …
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Functionalized carbon nanotube thin-film nanocomposite membranes for water desalination applications
Cost-effective purification and desalination of water is a global challenge. Reverse osmosis (RO), the current method of choice, requires high pressure drops across the membranes in order to achieve acceptably high flow rates. Conventional polymer membranes are limited in their performance by a …
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Computational analyses on the structure-function relation in ion channels
… into ion-fluxes. At a glance, ion channels are water-filled pores, which can open and close in response to different stimuli (gating), and one once open select the permeating ion species (selectivity). They play a crucial role in several physiological functions, like nerve transmission, muscular …
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Solvent resistant microporous/nanoporous polymeric hollow fiber and flat film membranes and their applications
… membranes were characterized by the water permeation rate. Crosslinking of PHI was implemented on the lumen side of the Nylon hollow fibers to reduce the pore size; then, their performance in membrane solvent back extraction was studied. Extraction of phenol from MIBK into an aqueous …
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Avalanching on dunes and its effects: Size statistics, stratification, & seismic surveys
… by physicists and engineers, and the water permeation that interests hydrologists and soil scientists determines the seismic velocities of concern to exploration geophysicists. In this dissertation, I describe four projects conducted for the degree of Doctor of Philosophy, using a …
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Bioaugmentation and biostimulation of a South African coal-based Technosol as a mine rehabilitation strategy
… by alkaline soil pH, lowered salinity, water permeation, and vegetational growth. Soil pH was regulated biogenically through MR application as biostimulant for microbial respiration. Teff biomass production and inflorescence were favoured in warmer conditions as a result of accelerated …