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 20 of 66 for “"water permeability"”.
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Imaging biological water permeability barriers using CARS microscopy
Alterations in the water permeability of the vasculature are attributed to several disease processes including atherosclerosis, reperfusion injury, diabetes mellitus, aging, chronic inflammation, and cancer. While vascular permeability has been extensively studied throughout the years, many of …
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The water permeability of the human erythrocyte in the temperature range +25CÌ to -10CÌ
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Strength and water permeability of concrete containing coal bottom ash as cement and fine aggregate replacement material
… aggregate. Afterward, compressive strength and water permeability tests were evaluated at 7, 28, 56, 90 and 180 days respectively. It was observed that concrete containing GCBA and UGCBA for all percentage replacement were found to be higher compressive strength and water permeability …
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Water permeability of plant cells measured by pressure probes: effects of light and turgor, and the role of unstirred layers
… unstirred layers (USLs) during measurements of water permeability (hydraulic conductivity) at the level of single cells, during measurements with the cell pressure probe (CPP) and (ii) on the use of the latter technique to investigate changes in water permeability of leaf cells in response to …
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High Strength Pervious Concrete
… cementitious materials, including cement, sand, water, and aggregate. The mixing ratios of these components have been modified to achieve high strength concrete and water permeability. The combination of pervious concrete was tested for compressive strength, water permeability, and density. The …
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MECHANISTIC STUDY OF AQUAPORINS BEHAVIOR UNDER DIFFERENT MICROENVIRONMENTS
Water is a valuable resource as a driver of life and economies. With water shortage being recognized as a global problem, alternative methods of water production are critical to support human activities. A recent development in the application of Aquaporins (AQPs) has revealed its tremendous …
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Soil Salinity Study in Northern Great Plains Sodium Affected Soil
… acid and gypsum) remediation strategies on water permeability and sodium (Na) transport in undisturbed soil columns and to develop a remote sensing technique to characterize salinization in South Dakota soils. Fortyeight undisturbed soil columns (30 cm x 15 cm) collected from White Lake, …
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Evaluation of concrete patch repairs
… types of generic repair materials, c) the water permeability of the above 6 types of generic repair materials, and d) the parameters which influence the adhesive strength of patch repairs. In order to evaluate the efficiency and quality of remote robotic hydroerosion, 4 sets of parameters …
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Engineering nanostructured selective layers for reverse osmosis membranes
… ensuring millions have access to adequate freshwater resources. Studies from the UN World Health Organization indicate that over 1.1 billion people currently lack access to reliable and secure freshwater supplies, with an estimated 2.5 million deaths per year from diseases associated with poor …
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Development and physicochemical characterization of thin-film composite nanofiltration membranes with covalent organic framework active layers
The global demand for water is increasing due to unprecedented population growth, accelerated urbanization, economic development, and climate change. With water demand outpacing supply, intensifying periodic water shortages are driving the development of creative solutions to address this global …
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The influence of crystalline admixtures on the mechanical and durability properties of cracked and uncracked concrete
In South Africa context, water scarcity calls for water retaining structures to perform with respect to strength and seepage. Thermal differential and shrinkage strains often cause cracking which allow seepage under the high hydraulic pressure. Continuous maintenance and repair strategies have …
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Development of new membranes for desalination pre-treatment
The use of membranes in water filtration is on the rise as they are reliable and filter wide variety of pollutants and fouling agents. On the other hand, fouling of the membrane and initial cost of the setup and the membrane itself are the areas which need major improvement. In this thesis, testing …
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The Characterization of Hemodialysis Membranes in Miniaturized Dialyzers
… fiber design. We evaluated internal filtration, water permeability, sieving coefficient (SC) and clearance of solutes, in the Medium Cut Off (MCO) and conventional High Flux (HF) miniaturized dialyzers. We found statistically significant differences between miniaturized MCO and conventional HF …
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Modification of polyamide thin film composite reverse osmosis membrane for water desalination
… particles play substantial role in improving water permeability without creating defects in cross-linking of polyamide layer. The best performing quantum composite membrane exhibited better performance in term of water flux and salt rejection when compared to that of nanocomposite and …
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CHARACTERIZATION AND FUNCTIONALITY OF RECOMBINANT AQUAPORINS FROM MOZAMBIQUE TILAPIA
… incorporated with aquaporin, having high water selectivity and permeability, are of interest. Hereby, we propose that Mozambique tilapia (Oreochromis mossambicus) aquaporins are potential candidates for the biomimetic membrane due to the ability of this tilapia to survive and adapt in a …
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Selective molecular transport in nanopore systems
… systems has the potential to revolutionize water filtration, nanofluidics, and biomolecule detection technologies. I give my characterizations of five nanopore systems as my dissertation. First, I present my study of nanopores in polyethylene terephthalate (PET), revealing the mechanism for …
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Synthesis, crosslinking and characterization of disulfonated poly(arylene ether sulfone)s for application in reverse osmosis and proton exchange membranes
… (RO) membranes for application in fuel cell and water purification respectively were developed by synthesis and crosslinking of disulfonated biphenol-based poly (arylene ether sulfone)s (BPS). Crosslinking is a prospective option to reduce the water swelling and improve the dimensional stability …
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Synthesis and comprehensive studies of nanogels for enhanced oil recovery
… light scattering. The ability of nanogels in oil-water interfacial tension (IFT) reduction and oil-in-water (o/w) emulsion stabilization was studied at various nanogel concentrations, temperatures, and salinities. Moreover, nanogels showed an electro-interaction controlled adsorption on the rock …
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Nanoporous graphene as a desalination membrane : a computational study
With conventional water sources in short and decreasing availability, new technologies for water supply have a crucial role to play in addressing the world's clean water needs in the 21st century. In this thesis, we examine how nanometer-scale pores in single-layer freestanding graphene can …
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Development of Thin-Film Composite Membranes Incorporated With Graphene Oxide and Derivatives for Forward Osmosis Processes
… the diffusivities of PA monomers, reduced water permeability by acting as barriers to water molecules when present at a high concentration near the PA surface, and formed non-selective voids at the PA layer when present at very high loading.
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