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 21 for “"Water fraction"”.
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Model-based myelin water fraction mapping: analyses and improvement
In this thesis, the problem of model-based myelin water fraction (MWF) mapping is addressed. We first focus on three of the most widely used signal models for T2*-myelin water imaging (MWI), i.e., the NNLS-multi-exponential model, the magnitude-3-exponential model, and the complex-3-exponential …
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The role of bound water content in defining sludge dewatering characteristics
… available methods of measuring sludge bound water content in the laboratory were examined. The effect of polymer conditioning on the bound water content of biological sludge samples was measured using the dilatometric method. The effects of mechanical dewatering on the bound water content of …
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The purification of C₁ components from the cellulase complex of Trichoderma viride
… cellulose substrate. The resulting Avicel Water Fraction contained essentially all of the recovered C₁ activity and yielded an 8.2 fold purification. The C₁ component was then further purified by chromatography on a weak anion exchange column (Bio-Gel DM). Elution with a pH 4.8 sodium …
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Conversion ratios for plutonium recycle in light water reactors: breeding potential in D₂O-H₂O cooled reactors
The conversion properties of close packed, water cooled, plutonium fueled lattices are studied. Lattices with both ordinary water and light-heavy water mixtures are considered. The effects of volume fractions, plutonium concentrations, and heavy water fraction on the neutronics are studied through …
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Phytochemical and pharmacological studies on some endemic Yucatecan medicinal plants
… bromide) assay followed by a bioassay-guided fractionation of the most active extracts in order to identify the active metabolites. The initial cytotoxic evaluation against HeLa cells at two fixed concentrations (100 and 33.3 µg/mL) identified the root extracts f J. flammea, S. foetidissimum …
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Characterization of water distribution in sludges
Knowledge of water distribution in sludges is important in developing a better understanding of the mechanisms by which various fractions of water are bound to the sludge matrix as well as the extent to which sludges may be dewatered in an economic manner. Various models have been proposed in the …
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The effects of rainfall runoff from urban and rural watersheds on trihalomethane precursors in streams
… was to investigate the relationship between watershed land use and seasonal changes on THM-formation potential from the waters of four streams located in northern Virginia. Specific objectives were to observe the effect of impoundment on downstream THM precursor concentrations and to evaluate …
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Characterisation and modification of hydrogel polymers
… of hydrated polymers the amoumt and nature of water present is the single most important factor. The most convenient method of characterising this water involves the use of differential scanning calorimetry (DSC), coupled with total equilibrium water content measurements. DSC distinguishes …
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A QUASIELASTIC NEUTRON SCATTERING STUDY OF WATER DIFFUSION IN FROG MUSCLE
… structure and dynamics of cytoplasmic water in the cells of organs and tissues are not well-understood. Much work has been done using various experimental techniques to study the properties of water in living systems, yet there is no generally accepted model describing the interaction …
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Non-invasive electromagnetic wave sensor for flow measurement and biphase application
… measurement is important in chemical processing, water treatment and oil & gas industry. The multiphase flow sensor proposed in this research utilizes the resonant frequencies that occur inside a cavity and the differences in the permittivity of the measures phases. By measuring this response over …
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Advanced Methods for Diffusion MRI Data Analysis and their Application to the Healthy Ageing Brain
Diffusion of water molecules in biological tissues depends on several microstructural properties. Therefore, diffusion Magnetic Resonance Imaging (dMRI) is a useful tool to infer and study microstructural brain changes in the context of human development, ageing and neuropathology. In this thesis, …
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Evaluation of aflatoxin-related products from ozonated corn
… molecular weights than AFB1. The dichloromethane fraction contained compounds with molecular ion peaks at 459 and 439 m/z while the water fraction contained compounds with molecular ion peaks at 475 and 494 m/z, after ozonation for 50 sec and 60 sec, respectively. Biosynthesis of [14-C]-labeled …
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… properties including the presence of open water, vegetation type and seasonal phenology, snow cover and freeze-thaw transitions. Daily maximum/minimum air temperature is retrieved with RMSEs of 2.88 K and 2.31 K, respectively. Soil temperature is retrieved with RMSE of 3.1 K. Vapor pressure …
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… properties including the presence of open water, vegetation type and seasonal phenology, snow cover and freeze-thaw transitions. Daily maximum/minimum air temperature is retrieved with RMSEs of 2.88 K and 2.31 K, respectively. Soil temperature is retrieved with RMSE of 3.1 K. Vapor pressure …
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nEstablishing soil compaction thresholds for the M1A1 Abrams tank at Camp Minden, Louisiana
… ‘moisture ranges’ (< 20%; 20 to 30%, and > 30% water fraction by volume, wfv) and 3 ‘traffic load rates’ (3, 6, or 9 passes) on 5 m2 plots. Comparison of pre- and post-trafficked soil bulk density (BD), soil penetration resistance (PR), and soil-moisture retention characteristics (SMR) were used …
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Identifying nitrate transport mechanisms and export dynamics using water age modeling and concentration-discharge relationships
… source of nitrate (NO3-) loss to surface waters. Water flow paths and residence times determine the contact length between NO3- and sub-surface material, controlling the rate of biogeochemical reactions and nitrogen removal via denitrification. A Nitratax N- NO3- sensor was installed at …
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The combined effects of fertilization and relative water limitation on tissue water relations, hydraulic parameters and shallow root distribution in loblolly pine (Pinus taeda L.)
… limitation resulted in changes to shoot tissue water relations parameters classically characterized in drought response studies. More severe water limitation was necessary to elicit responses, and those responses had not been fully described previously. The more severe water limitation resulted …
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Observations and assessment of iron oxide nanoparticles in metal-polluted mine drainage within a steep redox gradient, and a comparison to synthetic analogs
… drainage crossing a steep redox gradient (groundwater outflow into a stream) forms and transforms iron (oxy)hydroxide nanoparticles. These particles interact with toxic metal(loid)s in water and sediments. Iron oxidizing and reducing bacteria also play a role in these processes. Biogeochemical …
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Characterizing the fate and transport of chemicals of emerging concern (CECs) from swine manure during waste to energy processes
Animal manure and domestic wastewater contain chemicals of emerging concern (CECs) that can threaten ecosystems and human health. For instance, estrone (E1) and 17β-estradiol (E2) can disrupt the reproductive biology of vertebrates at very low concentrations. This study investigates the effects of …
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