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 95 for “"UF"”.
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A proof of principle nuclear forensics technique for determining ²³⁵U enrichment from UF₆ steel cylinders
… Nuclear Materials Group, this work investigated UF6 cylinders as a proof of principle to determine whether steel materials can be used as forensic materials for uranium enrichment. SEM, EDS, XPS, ToF-SIMS, TEM and FlashDSC were performed to determine if the surface deposition left chemical or …
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Descontaminación de efluentes de la industria cervecera mediante el uso de membranas UF arrolladas en espiral como barrera de seguridad
… de demostrar la idoneidad de las membranas de UF en el tratamiento de este tipo de efluentes que garantice un adecuado nivel de seguridad física, química y microbiológica para su posterior reutilización. Aportar nuevos datos sobre el comportamiento, a nivel de calidad de las aguas residuales …
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Desarrollo, caracterización y optimización de resinas base urea-formol (UF), como adhesivos para tableros aglomerados con baja emisión de formaldehído
Las Resinas urea-formaldehído (UF) son una clase de polímeros de condensacíón que se emplean como resinas sintétocas obtenidas a través de la reacción entre la urea y el formaldehído. Las resinas se utilizan principalmente como adhesivos para el encolado de tableros de partículas, fibras y otros …
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Screening of Microfiltration and Ultrafiltration Ceramic Membranes for Produced Water Treatment and Testing of Different Cleaning Methods
… (MF) membranes and two ceramic ultrafiltration (UF) membranes were tested. The treatment target was to reach a contamination level suitable for further treatment by nanofiltration (NF)/reverse osmosis (RO) polymeric membranes, discharge into sea or injection into oil wells for enhanced oil …
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Designing Magnetically Responsive Ultrafiltration Membranes
<p>Ultrafiltration (UF) membranes developed out of a need for protein separation processes. Currently, they are used in a variety of industries ranging from food manufacturing to pharmaceuticals for two main purposes: concentration, separation, and buffer exchange. UF membrane processes in product …
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The effect of uterine flushings on early bovine embryo development in vitro
… to evaluate the effect of uterine flushings (UF) obtained from ovariectomized progesterone (P) or estrogen (E) treated cows or from previously superovulated cows on day 6, 10, or 15 post insemination on early embryo development. Ninety-eight cows were superovulated with follicle stimulating …
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The fractionation of dextran polymer by ultrafiltration to yield clinical products
A review of ultrafiltration (UF) theory and equipment has been made. Dextran is fractionated industrially by ethanol precipitation, which is a high energy intensive process. The aims of this work were to investigate the fractionation of dextran using UF and to compare the efficiency and costs of UF …
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Full-scale operation of a tubular ultrafiltration system in the treatment of oily waste
… filter, tubular and rotary ultrafiltration (UF), land application, and constructed wetlands. The primary pollutant of concern was oil/grease (O/G). Separation of the free oil in a single three million-gallon pond was selected as primary treatment. Tublar ultrafiltration was chosen as the …
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Evaluation of uterine lumenal proteins in dairy cattle at known stages of the estrous cycle and in ovarian steroid treated ovariectomized cows
… biochemical methods. Uterine lumenal fluids (UF) were collected nonsurgically via a foley catheter. Sephacryl S-200 chromatography revealed protein peaks specific to UF from cyclic cows had distribution coefficients at ambient temperature of .27 ± .02, .32 ± .02, .65 ± .03, .73 ± .06, and .91 …
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Isotope ratios in source determination of formaldehyde emissions
… and the regulation target is urea-formaldehyde (UF) resin. UF resins are hydrolytically unstable and constantly emit formaldehyde as a function of temperature and relative humidity. When heated, wood also generates formaldehyde, but this was of little concern until 2010 when formaldehyde …
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Studies of the formation and properties of urea-formaldehyde resin adhesives
Urea-formaldehyde (UF) resin is used primarily as an adhesive for manufacturing wood panels (medium density fiberboard, particleboard and plywood). These are important New Zealand export products. A better understanding of the formation of UF resin will allow maximisation of its adhesive properties …
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Improving Texture and Flavor of Reduced-Fat Cheddar Cheese Using an Exopolysaccharide-Producing Culture and Ultrafiltration
… of chymosin needed to coagulate ultrafiltered (UF) milk might result in reduced residual chymosin activity and bitterness in cheese. The objectives of this study were to improve the texture and flavor of reduced-fat Cheddar cheese using a combination of EPS-producing culture and UF. Reduced-fat …
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Evaluating Winemaking Applications of Ultrafiltration
Ultrafiltration (UF) is a membrane-based technology that separates liquid feed by a molecular size principle, producing permeate with smaller molecules and retentate with larger molecules. Widely used in water treatment, it finds application in the food and beverage industries for processes such as …
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Assessing Biofiltration Pretreatment for Ultrafiltration Membrane Processes
… and upstream of an ultrafiltration (UF) membrane process was assessed for its treatment effectiveness. The impact of biofiltration pretreatment on UF membrane performance was evaluated holistically by investigating the native source water chemistry and extending the analysis into the …
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Computer Simulations for Applications of Magnetic Resonance Guided Focused Ultrasound Surgery (MRgFUS) of Uterine Fibroids
Uterine fibroids (UF)s are extremely common growths of the uterus, which despite generally being benign impose a considerable health burden: several hundred thousand hysterectomies for UF treatment are performed annually in North America. Magnetic resonance guided focused ultrasound surgery …
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Dextran Polymer Fractionation by Production Scale Chromatography and Ultrafiltration
… chromatography (GPC) and of ultrafiltration (UF) theory have been made. The aims of the project were to fractionate dextran, a polyglucose, on an existing chromatograph to achieve more optimum conditions of operation and to eliminate the silica dissolved from the chromatographic packing and …
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"Proyecto de inversión : habilitación de Rayos X osteopulmonar en el Hospital Comunitario de Til Til"
… imagenológicos las que se valorizan en 1749 UF, monto que reciben los centros de derivación de la Red de Salud Metropolitana Norte. Además, existe un gasto de bolsillo para el usuario de más de 800 UF relacionado con la movilización y distancia en la que se encuentran los centros de …
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Deformation mechanisms in bulk nanostructured aluminum obtained after cryomilling and consolidation by spark plasma sintering
Bimodal bulk nanocristalline (nc)/ultrafine (UF) aluminum was produced after cryomilling and spark plasma sintering consolidation process. The samples obtainedwere plastically deformed in uniaxial compression. We show that there is a significant fraction of plastic strain (11%) that can be …
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Development of seawater electrolysis with low-cost membranes for sustainable cement production and pretreatment
… a novel approach utilizing ultrafiltration (UF) membranes, typically employed in filtration processes, is proposed as a cost-effective alternative to traditional AEMs and CEMs in seawater electrolysis. UF membranes, known for their superior mechanical strength and lower cost, are used to …
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