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 30 for “"Low Flux"”.
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Low flux radiative ignition studies of ammonium perchlorate composite propellants
… data has been collected and studied for heat fluxes in the typical, intentional ignition range. However, when a propellant contained within a rocket motor case is exposed to low fluxes in hazardous situations, such as close proximity to a fire, unwanted ignition can also occur. These studies …
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Η επίδραση της αιμοκάθαρσης και του τύπου της μεμβράνης του φίλτρου στην εγγενή ανοσία ασθενών σε αιμοκάθαρση με μελέτη των φυσικών φονικών ΝΚ-λεμφοκυττάρων και των ουδετερόφιλων φαγοκυττάρων
… αιμοκάθαρσης [υψηλής διαπερατότητας (High Flux) και χαμηλής διαπερατότητας (Low Flux)] Στην μελέτη εντάχθηκαν συνολικά 60 ασθενείς σε εξωνεφρική κάθαρση. Από αυτούς, 20 ασθενείς (ομάδα Ι) υποβάλλονταν σε κλασική αιμοκάθαρση με φίλτρο υψηλής διαπερατότητας (cd-High Flux), 20 ασθενείς (ομάδα …
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In vitro-Untersuchungen zur Adsorption und Filtration von rekombinantem Hirudin : Vergleich unterschiedlicher Hämodialysatoren
… verschiedene in der Klinik häufig verwendete Low-Flux- und High-Flux-Dialysatoren hinsichtlich ihrer Filtrationseigenschaften für Hirudin charakterisiert. Alle verwendeten High-Flux-Dialysemembranen filtrierten Hirudin. Dabei zeigte der Polysulfon-Dialysator mit einem Siebkoeffizienten (SK) …
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Pyroelectric crystal-based X-ray diffractometer
… beam and determine that the system, although low flux and low resolution, will function as a quick and easy tool for the investigation of x-ray physics.
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Computational 3D and reflectivity imaging with high photon efficiency
… for accurate 3D and reflectivity imaging. Under low light-level conditions, in which the mean photon count is small, the inverse problem of forming 3D and reflectivity images is difficult due to the Poisson noise inherent in low-flux operation. In this thesis, we propose and study two …
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Denitrification in Membrane Bioreactors
Three membrane bioreactors, a low flux filter (LFF), a diafilter (DF), and an ion-exchange (IE) membrane bioreactor were used to treat water polluted with 50 ppm-N nitrate. The three systems were compared in terms of removal efficiency of nitrate, operational complexity, and overall quality of the …
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Spatiotemporal variability of methane ebullition from lake sediments
… the atmosphere include inland waterways and shallow oceans. However, the magnitude of these emissions and their potential for feedbacks with climate change remain poorly constrained. In many settings the majority of atmospheric methane emissions is delivered by bubbles, and the spatiotemporal …
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Defect Production in Alkali Halide Crystals by Monochromatic X and Ultraviolet Radiation (Photoluminescence, X-Ray Absorption, Spectra, Impurity)
… parts of the electromagnetic spectrum. Using low flux monochromatic sources, this efficiency was measured in the hard x-ray region at the K-edge of bromine in KBr and in the near ultraviolet part of the spectrum corresponding to the exciton region of the alkali halides. A significant increase …
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Analyzing and improving image quality in reflective ghost imaging
… correlation between the fields. In the low flux limit this quantum source becomes the biphoton state. We compare our results to the corresponding behavior seen in transmissive ghost imaging, and we develop performance results for the reflective form of computational ghost imaging. We …
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What goes down need not go back up: decreasing the biological drive toward weight regain by increasing energy flux
… this energy gap could be attenuated by a high flux (HF) state (higher expenditure coupled with higher intake). METHODS: 6 obese adults [age (mean±SE) = 42±12 y; body mass index (BMI)=35.7±3.7 kg/m2] underwent 7% diet-induced weight loss and were stabilized at this weight for 3 weeks. RMR via …
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Probabilistic estimation and prediction of groundwater recharge in a semi-arid environment
… for water resources management. Unfortunately, low recharge rates are difficult to resolve in dry environments, where groundwater is often most important. Motivated by such concerns, this thesis presents a new probabilistic approach for analyzing diffuse recharge in semiarid environments and …
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FROM DATA PRODUCTION TO SEARCH FOR GALACTIC COSMICRAY SOURCES WITH THE PIERRE AUGER OBSERVATORY
… with the Earth's atmosphere. However, their low flux, less than one particle per square kilometer per century, makes detection extremely challenging. This PhD thesis, titled From Data Production to Search for Galactic Cosmic Ray Sources with the Pierre Auger Observatory, delves into the …
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Development of in situ synthesis of silver polysulfone membrane for water separation
… area of the membrane. Then, water permeation flux rate increased up to 21 % and water quality assessment reached 86 % using lake water. In addition, high molecular weight of alkali reacts with AgN03 effectively and resulted on low flux reduction and high antibacterial properties as compared to …
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Alpha-Glucan, Water Dikinase and the Control of Starch Degradation in Arabidopsis thaliana Leaves
… enzymes of the pathway are regulated to modulate flux. In this work I focus on the first enzyme in the starch degradation pathway, GWD. This enzyme phosphorylates the starch granule surface, thereby stimulating starch degradation by hydrolytic enzymes. It is hypothesised that GWD is important for …
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Defect production in alkali halide crystals by monochromatic x and UV radiation
… parts of the electromagnetic spectrum. Using low flux monochromatic sources, this efficiency was measured in the hard x-ray region at the K-edge of bromine in KBr and in the near ultraviolet part of the spectrum corresponding to the exciton region of the alkali halides. A significant increase …
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Mechanisms of focused ion beam (FIB) material removal and rearrangement at high beam flux
… the first complete atomistic simulation of high-flux FIB using large-scale parallel molecular dynamics (MD) simulations of nanopore fabrication in freestanding thin films. We focus on the root mechanisms as described by large-scale MD simulations of FIB and describe the role of explosive boiling …
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The prediction of flux decline in cross-flow microfilters via three-dimensional fluid dynamic models of tortuous pore structure
Cross-flow microfiltration is a viable method to increase the in-use lifetime of semi-synthetic metalworking fluids. However in operation, fouling of the microfilter has been shown to occur and bring about a reduction of microfilter flux. This research develops a fluid dynamic model of the tortuous …
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Exciton Dynamics in Organic and Inorganic Nanoscale Materials
… the emission pathway of triexciton events under low-flux conditions and observe that the recombination is dominated by band-edge emission. These results are then compared to theory to determine how the relative carrier overlap affects the triexciton recombination dynamics. In the final section I …
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Experimental study and modeling analysis of ion transport membranes for methane partial oxidation and oxyfuel combustion
… and defect chemistry. While LCF exhibits low flux under non-reactive conditions, in the presence of fuel oxygen permeation increases by more than one order of magnitude. Our experiments confirm that hydrogen surface oxidation is faster compared to carbon monoxide. With methane, syngas …
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Functionalized carbon nanotube thin-film nanocomposite membranes for water desalination applications
… membranes in order to achieve acceptably high flow rates. Conventional polymer membranes are limited in their performance by a trade-off between water permeability and water/salt selectivity. Biofilm fouling is another critical problem in RO applications. Recent simulations and experiments …
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