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Yoo, Choong Don. "Effects of weld pool conditions on pool oscillation /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu148768624382255.
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Nilsson, Linette. "Swimming Pool." Thesis, Konstfack, Textil, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-5827.
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My project started with two words: Swimming Pool. They came to me through a song, Banshee Beat by Animal Collective (2005). To me, their music is mystical, abstract, unpredictable and also metaphorical. So I started to think about if a swimming pool could be something more than just an open container filled with water. After some thinking I came to the conclusion that it could be a metaphor for something calm, quiet and dreamy. However, I’m not sure but my aim is not to get to a specific answer through this project. I’ll turn the metaphor into a textile work that portrays what you see when you’re standing at the edge of the swimming pool; a distorted picture of a grid, the bottom of the pool. I’ll be working with dyeing, patchwork and quilting. The textile craft is important in this project because of how relaxed and calm I get by doing things with my hands. The questions I’m asking myself are how I can express the metaphor through my work? What if my interpretation is too wide? Is it possible for me to create a tactile and calm feeling without the physical touch?
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Gao, Hongjiang. "Hypothesis testing based on pool screening with unequal pool sizes." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2010. https://www.mhsl.uab.edu/dt/2010p/gao.pdf.
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Stemple, Carrie M. "Perceptions of calf pool participants toward West Virginia calf pool organizations." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5128.
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Thesis (M.S.)--West Virginia University, 2007.Title from document title page. Document formatted into pages; contains vi, 102 p. : col. ill. Vita. Includes abstract. Includes bibliographical references (p. 46-48).
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Oscarson, Damon B. "Conserving Vernal Pools at the Local Level: Implementing Best Development Practices in Four New England Towns." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/OscarsonDB2009.pdf.
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Delgado, T. Cristina, M. Ivis Vanessa Delgado, G. José Antonio Montalvo, and José Miguel Quiróz. "Chivis pub, pool lounge." Tesis, Universidad de Chile, 2005. http://www.repositorio.uchile.cl/handle/2250/114213.
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Tesis para optar al grado de Magíster en Administración(MBA)No disponible a texto completo
En la actualidad el concepto de vida nocturna esta teniendo cada vez más auge en la vida de los Santiaguinos, estos buscan diversas formas de distracción ya sea en Pubs, Restaurantes u otros. Este crecimiento se ve reflejado en el sostenido aumento de las ventas de esta industria. Por ejemplo, en el primer trimestre del 2004 con relación a igual periodo del año anterior, hubo un crecimiento de un 1.3%. (Diario El Mercurio 04.10.04 ) Conjugando esta situación, con los cambios en los gustos de los consumidores, que indican que, más de un 60% de las personas, van a divertirse a Pubs y que salen en promedio dos veces a la semana, se fundamenta nuestra idea de abrir “CHIVIS”, un Pub, que ofrecerá gratos ambientes, para disfrutar y divertirse en un mismo lugar. Ambientes para degustar una comida agradable, para disfrutar de juegos como mesas de billar profesionales con asientos y muebles confortables para que los que no estén jugando puedan acompañar y disfrutar a su vez. Será la parada perfecta, para después de la oficina, almorzar, comer algo o tomar un trago, tal vez una pequeña reunión social, de negocios o para disfrutar simplemente de juegos y diversión. Todo esto es reforzado por nuestro objetivo principal, una atención personalizada, una orientación hacia el cliente “Un servicio de excelencia”. Un gran número de personas, busca un grato ambiente al momento de elegir donde ira a divertirse, igualmente otro importante numero de personas, una excelente atención al cliente, de la misma forma hay quienes prefieren un lugar con diversas posibilidades de entretención, Chivis ofrecerá esto y más. Nos enfocaremos en ejecutivos y profesionales del segmento ABC1 y C2, principalmente de las Comunas de Las Condes y Providencia los cuales cuentan con los ingresos necesarios para poder optar por opciones de entretención. Llegaremos a ellos por medio de volantes entregados en sus oficinas y en las áreas colindantes de Chivis, así como anuncios en las emisoras Universo, Tiempo y Duna. El modelo de negocio se sustenta en obtener beneficios económicos que vendrán de la venta de bebidas y comidas, las cuales estarán soportadas por el atractivo del local. Nuestra estrategia es mantener un flujo regular de nuevos clientes, los que después de probar y disfrutar de nuestro estilo Chivis, se convertirán en clientes a largo plazo, posicionando la marca de nuestro Pub. Con una inversión de M$140.885.330, de los cuales el 67% del total, equivalente a M$93.923.553, serán aportados por los socios fundadores, y el 33% restante, correspondiente a M$46.961.777, proveniente del aporte adicional de un inversionista externo. Este proyecto presenta un VAN de M$ 60.560.163, otorgándole al inversionista externo una rentabilidad sobre su inversión al primer año del 17%, y del 157% para el término de los 5 primeros años. Estamos seguros de poseer el enlace perfecto entre los atributos y el estilo “Chivis”, con un equipo que posee experiencia en este rubro y que cuenta con los conocimientos de marketing, finanzas y gestión de servicios, que nos permitirá lograr ventajas competitivas para posicionar nuestra marca y convertirla en la primera opción para los consumidores.
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Hattingh, Keaton Jade. "Geomorphological controls on pool formation and pool persistence in non-perennial river systems." University of the Western Cape, 2020. http://hdl.handle.net/11394/7739.
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>Magister Scientiae - MScGlobally climate variability and anthropogenic effects are causing more perennial rivers to become non-perennial rivers. Non-perennial rivers are distinguished by their isolated pools which serve as refugia for aquatic organisms, water birds, and riparian vegetation. The literature on non-perennial rivers demonstrates that pools are poorly understood in terms of their location, nature, and geomorphic persistence. Therefore, this study examines the relationships between the spatial distribution, morphology, and substrate characteristics of pools in reaches of the Prins and Touws rivers in the Klein Karoo. A greater understanding of pools will facilitate better management, monitoring, and restoration strategies for pool ecology since the geomorphology of pools provides a key part of the ecological template. Worldview-2 satellite imagery (2017) and orthorectified aerial photography (2014, 2013, and 1944) were used to assess the effects of major flooding events on pools over time. A DGPS (Differential Global Positioning System) was used to survey the pool widths, lengths, depths, and valley widths, cross-sections, and longitudinal profiles of the river. Sediment samples and Wolman pebble counts were used to assess the grain size and organic matter content of each pool in the study area. Detailed descriptions of the characteristics of each pool in terms of position in the channel, valley form, and obstruction presence and type were also assessed. Results indicate that most of the large pools occur at bedrock outcrops of the valley margins, and smaller pools are associated with Vachellia karroo debris bar features. Larger and highly persistent pools are associated with valley confinement and smaller less persistent, scour pools occur mid-channel where the valley expands. Analysis of the results shows that the valley width is the dominant control on these forced pools. The type of obstruction also plays a role in the formation of the pool as large woody debris results in smaller pools whereas, bedrock outcrops result in larger sized pools. A significant relationship was found between the grain size and organic matter content of pools. Aerial photography of the spatial distribution of the pools revealed that before a major flood, the pools were small and patchy, whereas afterward, they were larger and more elongated. It is suggested that at the bedrock outcrops, major scouring and eddy processes drive the formation of larger pools during large flood events, whereas pool dissection by sediment deposits prevails during intervening intermediate to low flow periods. The results are discussed in terms of the geomorphic controls (valley width, pool dimensions, morphology, substrate, and obstruction characteristics) on the formation and maintenance of pools in dryland settings. A conceptual model is proposed to explain the geomorphic changes of the pools in the four geomorphological zones of non-perennial rivers.
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Gatin, Laureen. "Restructuring the Saskatchewan Wheat Pool." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39140.pdf.
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Peters, Colette. "Learning pool, a narrative inquiry." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0024/MQ42189.pdf.
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Huang, Wesley H. "A simple robot pool player." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/12943.
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Sussitz, Hermann. "Pool Sharing in Humanitarian Logistics." Institut für Transportwirtschaft und Logistik, WU Vienna University of Economics and Business, 2010. http://epub.wu.ac.at/2995/1/Sussitz.pdf.
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Abukar, Hared, and Saati Firas Al. "Weda pool cleaner Concept P100." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201609.
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Syftet med detta examensarbete var att ta fram en ny drivlina för Wedas nuvarande robot poolrengörare W50. I nuläget är pumpen integrerad i drivlinan som består endast av en motor som driver både hjul och pump. Detta orsakar ett kritiskt problem som påverkar städning vid lutningar i poolen då roboten glider ner för lutningen. För att få en bättre insikt i hur produkten fungerar gjordes studiebesök till Weda. Projektgruppendokumenterade och observerade hur den nuvarande modellen och dess komponenter är monterade. Intervjuer utfördes med vaktmästare och fastighetsskötare inom olika kommunala bad och hotellpooler för att få en djupare förståelse för hur dessa robot poolrengörare används och vilka förbättringsområden som finns. Faktainsamlingen användes som grund för att ta fram förslag för nya och alternativa komponenter till det nya konceptet. De olika lösningarna blev sedan utvärderade med hjälp en beslutsmatris för att kunna bestämma vilka komponenter som skulle ingå i det slutgiltiga konceptet. Arbetet har utförts i nära samarbete med Adigo Drives, som bistått med sin expertis gällande motorer och drivlinor. Resultatet utmynnade i ett slutgiltigt koncept med en ny drivlina och en lägre vikt än den befintliga roboten.The purpose of this study was to develop a new drivetrain for Wedas current robot pool cleaner W50. Currently, the pump is integrated in the drivetrain which contains only one motor running both wheels and pump. This causes a critical problem affecting cleaning when encountering inclinations in the pool, the robot slides down the slope. To get a better understanding of how the product works, the project group made study visits to Weda. The group documented and observed how the current model and its components are mounted. Interviews were conducted with caretakers and janitors at various municipal swimming pools and hotel pools to get a deeper understanding of how these robot pool cleaners are used and what areas for improvement that exists. The research was used as a foundation for suggestions of new and alternative components for the new concept. The different solutions were then evaluated using a decision matrix to determine which components should be included in the final concept. The work has been carried out in close cooperation with Adigo Drives, which assisted the group with their expertise regarding motors and powertrains. The results culminated in a final concept with a new powertrain and a lower weight than the existing robot.
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Bullock, Gillian. "Disinfection of swimming pool water." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/108.
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Results from this study, which has investigated the impact of the treatment technologies of chlorination, ozonation and UV irradiation on pool water quality are reported. The aim of the study was to evaluate the effect of these technologies in an unbiased way using a unique protocol, and to calculate a mass balance across the pool system. Data refer to a protocol based on operation of a 2.2m (cubed) capacity pilot swimming pool, which allows the comparison of technologies applied with reference to the propensity to generate the chlorinated disinfection by-products (DBPs) of chloramines and trihalomethanes (THMs). The protocol makes use of a specially developed body fluid analogue (BFA), containing simulant endogenous organic matter, with a soiling analogue consisting of commercial humic acid (HA). Using this analogue, levels of organic carbon (OC) and chloramines similar to those recorded in real pools have been obtained, along with somewhat lower levels of THMs. Results revealed conventional chlorination leads to steady-state TOC and DBP levels following an equilibrium period of 200-600 hours, with concentration values which are dependent on BFA loading rate. Following equilibration nitrate is the only DBP accumulating in the pool water, accounting for between 4% and 28% of the ammoniacal nitrogen loaded into the pool depending upon the operating conditions (primarily the Cl:N ratio). Both UV irradiation and ozonation, the latter combined with downstream adsorption, provide a similar efficacy in reducing chloramine levels, with their effect on THM and nitrate formation being highly dependent on the pH level and chlorine dose rate. This study builds on previous experimentation by including a more rigorous analysis of ozone-GAC with respect to DBP formation, a unique analysis of UV irradiation and a more comprehensive mass balance calculation of C, Cl and N across the pool. The study has established that no accumulation of carbon takes place in the pool, contrary to postulations made in previous published studies, and that the balance between the chloramines and THM DBPs is significantly affected by the HA loading.
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Pascual, Christopher C. "EHD enhancement of nucleate pool boiling." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19027.
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Davis, Gareth Michael. "Mathematical modelling of swimming pool chlorination." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402341.
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Sriraman, Sharan Ram. "Pool boiling on nano-finned surfaces." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2091.
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Rawlinson, Rosemary Julia. "Glutathione and the cytosolic heme pool." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/glutathione-and-the-cytosolic-heme-pool(e78204fa-e583-41eb-ab9c-1a759b9abf33).html.
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Recently glutathione (GSH) has been proposed as a key component of the cytosolic iron pool, possessing a buffering role for cytosolic iron(II), protecting it from autoxidation. However the chemical nature of the cytosolic heme pool is unknown. We have investigated whether GSH binds heme iron. If so, the resulting complex would be expected to have increased stability and solubility in aqueous solutions, compared to the extremely hydrophobic heme molecule, thereby reducing its ability to partition into membranes. An interaction between glutathione and hematin was established with the affinity constant (Ka) of glutathione for hematin determined by absorption spectroscopy to be 5x104 M-1. Using standard bioassays the influence of GSH on heme oxidase activity and the partitioning of hematin into lipid bilayers was assessed. GSH was found to stabilise hematin in the presence of H2O2 and was found to have a profound effect on the partitioning of hematin into lipid bilayers, reducing partitioning into prepared liposomes by < 70%. The presence of hematin ligated to GSH within the lysate of mammalian cells was established using synthesised [59Fe]hematin, Caco-2 cells and size exclusion HPLC. These results suggest that GSH could be the predominant ligand for the cytosolic heme pool. The effect of glutathione on absorption and catabolism of hematin in Caco-2 cells showed an initial decrease in hematin uptake and a decrease in heme oxygenase 1 expression. Hematin when ligated to GSH, in the presence of ascorbic acid and O2, was found to be rapidly degraded and whilst GSH decreases hematin partitioning into erythrocyte plasma membranes, the effect was not as dramatic as was observed in liposomes. These results did not provide further support for glutathione serving as the predominant ligand for the organic iron pool and led to the conclusion that heme is chaperoned (not by glutathione) and encapsulated within endosomes in the cytosol. It is proposed that GSH and ascorbic acid function cooperatively to rapidly ligate and degrade any heme which escapes from the endosome system into the cytosol, hence preventing ferroptosis.
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Shawkat, Salman, and Ragheed Hussain. "Concrete Cracks in Swimming Pool Basins." Thesis, KTH, Byggnadsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208349.
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Majority of the swimming facilities in Sweden are facing some form of renovation or total substitution. The report analyses cracks in two different public bath facilities namely Eriksdalsbadet and Enskedehallen. The text also discusses different solution strategies for cracks in concrete. The aim with this thesis is to discuss how facility managers can extend the service life of these facilities by taking measures against the crack damages. Since renovation can be expensive, it is important to study cracks early on when they appear. This thesis also emphasizes on how important it is to add resources for preventing cracks, already during casting. Resources should also be added for maintaining the basins, managing repair methods for all types of cracking problems. This thesis is more of a generalized study for cracks in concrete, however it concludes with taking a more specific approach by discussing the problems in swimming basins. Causes of cracks, different types of cracks and evolution of cracks are studied and discussed with emphasis on the structural damages that can occur. With pictures taken and analyzed from the two facilities and a visitation with a experienced concrete investigator from CBI, this thesis concludes with a decision to immediately take repair actions against cracks that are shown in the report. The report discusses two perspectives, one where the authors of the thesis discusses solutions derived from information given in the report, and the other perspective is derived from guided inspection with consultant from CBI.Neris projektet
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Hansson, Johan. "Är terminspriserna på Nord Pool snedvridna? : En studie av spot- och terminspriser på den nordiska elbörsen Nord Pool." Thesis, Uppsala University, Department of Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8555.
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I denna uppsats undersöks om terminspriset på el är snedvridet jämfört med det framtida spotpriset. Undersökningen har fokuserats på elmarknaden och den prissättning som sker på den Nordiska elbörsen, Nord Pool. Först presenteras en teori om varför det finns en derivatamarknad och vilken betydelse den har. Vidare så förklaras vad som menas med spot- respektive terminspris och därefter förklaras hur de förhåller sig till varandra utifrån ekonomisk teori. Sedan introduceras hur marknaden fungerar på Nord Pool och hur prissättningen sker av spot- och terminspriset. Detta följs upp med hur det går till rent praktiskt att handla med ett terminskontrakt i form av ett futureskontrakt. Olika ekonometriska tester kommer sedan att utföras för att se på variablernas underliggande trender och slutligen undersöks huruvida futurespriset är en snedvriden skattning av framtida spotpris. Datamaterialet som har använts är veckovisa observationer från vecka 1, 1996 till vecka 41, 2007. Resultatet visar på att futurespriset är en snedvriden skattning av framtida spotpris då futurespriset i genomsnitt visade sig vara högre än framtida spotpris.
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Ghiu, Camil-Daniel. "Pool Boiling from Enhanced Structures under Confinement." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16229.
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A study of pool boiling of a dielectric liquid (PF 5060) from single-layered enhanced structures was conducted. The parameters investigated were the heat flux, the width of the microchannels and the microchannel pitch. The boiling performance of the enhanced structures increases with increase in channel width and decrease in channel pitch. Simple single line curve fits are provided as a practical way of predicting the data over the entire nucleate boiling regime.
The influence of confinement on the thermal performance of the enhanced structures was also assessed. The main parameter investigated was the top space (0 mm { 13 mm). High-speed visualization was used as a tool . For the total confinement ( = 0 mm), the heat transfer performance of the enhanced structures was found to depend weakly on the channel width. For >0 mm, the enhancement observed for plain surfaces in the low heat fluxes regime is not present for the present enhanced structure. The maximum heat flux for a prescribed 85 oC surface temperature limit increased with the increase of the top spacing, similar to the plain surfaces case. Two characteristic regimes of pool boiling have been identified and described: isolated flattened bubbles regime and coalesced bubbles regime.
A semi-analytical predictive model applicable to pool boiling under confinement is developed. The model requires a limited number of empirical constants and is capable of predicting the experimental heat flux within 30%.
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Nimander, Fredrik. "Investigation of Spent Nuclear Fuel Pool Coolability." Thesis, KTH, Reaktorteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42440.
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The natural catastrophe at Fukushima Dai-ichi 2011 enlightened the nuclear community. This master thesis reveals the non-negligible risks regarding the short term storage of spent nuclear fuel. The thesis has also investigated the possibility of using natural circulation of air in a passive safety system to cool the spent nuclear fuel pools. The results where conclusive: The temperature difference between the heated air and ambient air is far too low for natural circulation of air to remove any significant amount of heat from the spent nuclear fuel pool in a worst case scenario. Air, as with any gas, has too low density and a specific heat too low to be able to remove the heat generated by spent nuclear fuel shortly after it has been removed from the reactor core. The author does not deny the possibility of slightly prolonging the boiling with other designs. The author does however suggest other possibilities to prolong cooling with the conclusion that large enough spent fuel pools would constitute the simplest solution.
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Martinsen, Thomas Bølstad. "Energy Efficient Task Pool Scheduler in OmpSs." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22976.
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The European Mont-Blanc project aims to build future exascale systems using energy efficient low-power devices. Exascale systems built using low-power devices will require a large number of processors to achieve competitive performance against state-of-the-art supercomputers. The project relies on the OmpSs programming model and its runtime system, in order to handle the complexity of such a massively parallel system.In this study, an alternative scheduling-plugin has been developed to improve the energy efficiency of the OmpSs runtime system. The proposed scheduling policy from the paper 'Process Cruise Control' has been extended for multi-core systems and integrated into the developed scheduling-plugin. The scheduling-plugin improves the energy efficiency by continuously monitoring the workload, in order to identify situations where it would be beneficial to adjust the frequency through dynamic voltage and frequency scaling. The solution has been evaluated on Sandy Bridge-EP with 17 OmpSs application kernels. Energy consumption is measured for the processor package through the Running Average Power Limit interface on Sandy Bridge. The results shows that energy savings can reach up to 30% in memory intensive applications with limited impact on performance.
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Li, Yifan. "Optimal pool size for pooled drug screening." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104708.
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Pooled drug design is an important approach in modern, high-throughput pharmacology, in which a large library of compounds is scanned using automated means, in order to find drug combinations that are active against a given target. In order to minimize costs, it is important to decide on the pool size, i.e., the number of compounds which will be tested together. In this paper, we analyze the expected number of trials necessary to determine a winning combination, under the assumption that the compound library may also contain blockers, which will obscure the effect of a drug combination if present in the same pool. We establish formulas for the optimal pool size and show that, surprisingly, it is not affected by the amount of measurement noise. Finally, we present a Bayesian approach that can be used when the number of blockers is unknown. An important result is that using pool sizes greater than the number of desired targets is beneficial, for a large range of possible numbers of blockers.Nous addressons le problème de la determination des groupes de substances chimiques pour obtenir des nouveaux traitements. Le but est d'automatiser l'analyse des librairies des larges librairies chimiques et pharmacologiques. L'hypothese de base est qu'il y a un groupe de substances qui ont un effect positif sur une certaine maladie, mais on doit l'identifier par l'analyse d'un très large groupe de substances. Dans ce groupe, il y a aussi des substances qui peuvent masquer l'effet désirable. Nous proposons une formule pour calculer le nombre optimal de substances qu'on devrait tester à la meme fois. La conclusion surprenante est que ce nombre ne depend pas des erreures qu'on fait dans les mesurements. Nous etablissons aussi le nombre de combinaisons qu'on devrait tester pour identifier le groupe desiré. Nouspresentons aussi une approche Bayesienne qu'on peut utiliser quand le nombre des substances bloquant l'effect desiré n'est pas connu.
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Legbedji, Alexis Motto. "Price schedules coordination for electricity pool markets." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38456.
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We consider the optimal coordination of a class of mathematical programs with equilibrium constraints, which is formally interpreted as a resource-allocation problem. Many decomposition techniques were proposed to circumvent the difficulty of solving large systems with limited computer resources. The considerable improvement in computer architecture has allowed the solution of large-scale problems with increasing speed. Consequently, interest in decomposition techniques has waned. Nonetheless, there is an important class of applications for which decomposition techniques will still be relevant, among others, distributed systems---the Internet, perhaps, being the most conspicuous example---and competitive economic systems. Conceptually, a competitive economic system is a collection of agents that have similar or different objectives while sharing the same system resources. In theory, constructing a large-scale mathematical program and solving it centrally, using currently available computing power can optimize such systems of agents. In practice, however, because agents are self-interested and not willing to reveal some sensitive corporate data, one cannot solve these kinds of coordination problems by simply maximizing the sum of agent's objective functions with respect to their constraints. An iterative price decomposition or Lagrangian dual method is considered best suited because it can operate with limited information. A price-directed strategy, however, can only work successfully when coordinating or equilibrium prices exist, which is not generally the case when a weak duality is unavoidable. Showing when such prices exist and how to compute them is the main subject of this thesis. Among our results, we show that, if the Lagrangian function of a primal program is additively separable, price schedules coordination may be attained. The prices are Lagrange multipliers, and are also the decision variables of a dual program. In addition, we propose a new form of a
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Chua, Cheong Wei 1975. "A stochastic pool-based electricity market simulator /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31045.
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In Part I, two pool-based electricity market models are compared in terms of their economic impact on the market participants, the Lossless Economic Dispatch (LED) and the Optimal Power Flow (OPF). The OPF is shown to be economically more efficient, more accurate and more equitable to the participants.In Part II, a stochastic electricity market simulator (SEMS) is designed using elements of Monte Carlo methods and game theory. Each generator is assumed to operate in a stochastic manner, according to a bid strategy composed of a set of pre-established bid instances and a corresponding set of bid probabilities. The Pool dispatches power and defines prices according to either the LED or OPF models from Part I. Generators can update their bidding strategies according to a profit performance index reflecting their degree of risk tolerance, Chicken (risk averse), Average, and Cowboy (risk taker). SEMS can predict issues such as unintended collusion, as well as to evaluate bidding strategies.
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Martínez, Marchal Ana. "Regulation of the oocyte pool in mammals." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667797.
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Durant la oogènesi dels mamífers, les oogònies proliferen forman els anomenats cists. Les oogònies entren en meiosis progressant en la profase I i els cists es trenquen al mateix temps que es produeix una mort massiva perinatal dels oòcits. En la profase I, s’indueixen trencaments de doble cadena (DSBs) per tot el genoma, que son reparats per recombinació homòloga per a promoure la sinapsi dels cromosomes homòlegs. Existeixen diferents mecanismes que s’activen en resposta a errors en aquests processos i que aturen el cicle cel·lular i produeixen l’apoptosi de les cèl·lules danyades. La resposta al dany al DNA (DDR) es activada en presència d’oòcits i d’espermatòcits amb errors de recombinació en l’anomenat checkpoint de recombinació. Per l’altre banda, errors en la sinapsi activen el checkpoint de sinapsi. El nostre objectiu era caracteritzar les funcions de la DDR i del checkpoint de sinapsi durant l’oogènesi en mamífers. Contràriament al que succeeix en espermatòcits, els oòcits presenten un alt número de DSBs no reparats a l’estadi de paquitè en el moment en que es produeix la mort oocitària massiva i el trencament del cists. Per tal d’esbrinar si el checkpoint de recombinació participa en la regulació del número d’oòcits en mamífers, hem analitzat el número de DSBs, el número d’oòcits en femelles perinatals i adultes, el trencament dels cists, la formació de fol·licles i la vida reproductiva de femelles de ratolí control i mutants per a la quinasa efectora de la via de la DDR, la proteïna CHK2. Les nostres dades han revelat la implicació de CHK2 en la regulació del número d’oòcits, però només en ovaris fetals, obrint la possibilitat de l’existència d’una via alternativa regulant el número d’oòcits després del naixement. Els nostres estudis utilitzant ovaris cultivats in vitro en presència d’inhibidors, suggereixen que CHK1 podria compensar l’absència de CHK2 in vivo. Per tant, la via de la DDR controlaria el número d’oòcits en mamífers. A més, hem trobat un augment del número d’oòcits en adultes velles mutants per CHK2 suggerint que la DDR controla la llargada de la vida reproductiva en mamífers. Finalment, hem estudiat el possible paper de TRIP13 en el checkpoint de sinapsi. La proteïna TRIP13 es necessària per a la recombinació, però també per a la sinapsi dels cromosomes sexuals i per a la formació de la vesícula sexual, suggerint un possible rol al checkpoint de sinapsi. Hem analitzat el número d’oòcits en ovaris Spo11-/- Trip13mod/mod i Dmc1-/- Chk2-/- Trip13mod/mod per a esbrinar si TRIP13 es necessària per a activar el checkpoint de sinapsi en femelles. Les nostres dades han revelat un rescat en el número d’oòcits en el triple mutant, però no en el doble. Aquest resultats obren la possibilitat de que TRIP13 participi en el checkpoint de sinapsis, però com a alternativa, proposem que aquesta participació podria ser compatible amb una possible regulació per part de TRIP13 de la elecció de la via de reparació dels DSBs.During mammalian oogenesis, oogonia proliferate forming the so-called cysts. The oogonia enter meiosis progressing through prophase I and the cysts break down concomitantly to massive perinatal oocyte death. During meiotic prophase I, double strand breaks (DSBs) are induced throughout the genome and repaired by homologous recombination to promote the synapsis of the homologous chromosomes. In response to errors in these processes, different response pathways are activated triggering cell cycle arrest or even apoptosis. The DNA damage response (DDR) is activated in response of meiocytes with recombination failure in the recombination checkpoint; while errors in synapsis trigger the synapsis checkpoint. We aimed to characterize the roles of the DDR and synapsis checkpoint in mammalian oogenesis. Contrary to what occurs in spermatocytes, oocytes present high numbers of unrepaired DSBs at pachynema, at the time of the massive oocyte death and cyst breakdown. In order to know if the recombination checkpoint participates in the regulation of the oocyte number in mammals, we analyzed the presence of DSBs, the oocyte number in both perinatal and adult females, the cyst breakdown, the formation of follicles and the reproductive lifespan using control and mutant mice for the effector kinase of the DNA damage response pathway, CHK2. Our data revealed the involvement of CHK2 in the regulation of the oocyte number but only in fetal ovaries prior to birth, raising the question of a possible alternative regulator acting just after birth. Our studies using in vitro ovarian cultures using inhibitors, suggest that CHK1 may compensate the loss of CHK2 perinatally in vivo. Thus, revealing that the DDR pathway controls the oocyte number in mammals. Furthermore, we found an increased number of oocytes in elder Chk2 mutant females suggesting that the DDR controls the reproductive lifespan extension in mammals. Finally, we studied the possible involvement of TRIP13 in the synapsis checkpoint. The protein TRIP13 is required for recombination, but it is also needed for the synapsis of sex chromosomes and the sex body formation. Thus, suggesting a possible role in the synapsis checkpoint. We analyzed the oocyte number in females from Spo11-/- Trip13mod/mod and Dmc1-/- Chk2-/- Trip13mod/mod ovaries in order to infer if TRIP13 is required to implement the synapsis checkpoint in females. Our data revealed a rescue in the number of oocytes in the triple mutant, but not in the double mutant. These results leave open the possibility of a participation of TRIP13 in the synapsis checkpoint, but as an alternative, they could be compatible with a possible role of TRIP13 regulating the DSB repair pathway choice.
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Geuer-Pollmann, Christian. "Confidentiality of XML documents by pool encryption." Aachen : Shaker, 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971948488.
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Sharp, Jeremy Allen. "SEDIMENT BUDGET TEMPLATE FOR THE ABERDEEN POOL." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-092448/.
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The purpose of this work is to create a sediment budget template (SBT) with Aberdeen Pool on the Tennessee-Tombigbee Waterway as the demonstration site. The first task is to define the sediment behavior for the system in question. USGS data are used for sediment concentrations and flows. The USGS data are the basis for the Power Curve Program which defines the sediment behavior in terms of a power function. The second program, Tier 1 Program, uses the power curve coefficients along with the bankfull discharge to define the sediment fluxes. Thirdly, the Tier 2 Program uses power curve coefficients with daily flows to calculate daily sediment flux which are integrated over each year to calculate the yearly fluxes. From the sediment fluxes, a mass balance equation is implemented to estimate total deposition. Lastly, the computer program SIAM is used to estimate deposition amount. Comparison among the three different methods provides a best estimate of the final depositional approximation.
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Geuer-Pollmann, Christian. "Confidentiality of XML documents by pool encryption." Aachen Shaker, 2003. http://deposit.d-nb.de/cgi-bin/dokserv?idn=971948488.
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Ashton, Taylor John. "An Analysis of Common Pool Resource Management." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/579004.
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The use and management of common pool resources can cause problems with property ownership and usage rights. Rules, regulations and policy development are all necessary in ensuring proper management and control of these common pool resources. In this thesis I use Elinor Ostrom's framework on decision making methods and policy models to analyze the decisions common pool resource users make, and the policy approaches that can be used to address the overuse or misuse of these resources. In order to better understand managing institutions and the systems that oversee these resources, Ostrom's approaches and theories are illustrated through the operations of the Bureau of Land Management. The BLM directly manages millions of acres of public lands through the rules and regulations set forth in the Federal Land Policy and Management Act of 1976. The ongoing land use dispute with Cliven Bundy in Bunkerville, NV is used as an applied example to analyze the decision making of land dispute players, as well as question the effectiveness and efficiency of an actual managing institution. In conclusion it is seen that BLM policies are adequate for effectively overseeing public lands, but adherence to the regulations and strict enforcement is necessary for a cooperative relationship between management agencies and the individuals working with them.
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Käser, Daniel. "Hyporheic exchange flow along pool-riffle sequences." Thesis, Lancaster University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.653056.
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The alternation of bathymetrlc lows (pools) and highs (riffles) along a stream plays a critical role in ecology. Besides providing a diversity of substrate material and local flow velocities, pool-riffle sequences (PRS) influence the living conditions in the near-stream sediments by inducing an infiltration of surface water Into the subsurface and a delayed exfiltration back to the stream. This process, called hyporheic exchange flow (HEF). supplies oxygenated water to subsurface organisms and has the potential to modify the chemical composition of stream water. Although PRS-induced HEF is to some degree predictable, little is known about its potential variability in time, space, and across scales. The research reported here investigates this gap through field experimentation in low flow conditions, and numerical modelling. First flow characteristics are detailed through extensive in situ measurements conducted at the metre-scale, and across a range of temporal resolutions. The geometry of the subsurface flow systems, residence time distributions, and fluxes are then estimated through three-dimensional groundwater modelling. Using these models, a sensitivity analysis is performed to characterize the influence of identified controls on HEF characteristics. Finally through a hypothetical 2·D model of a pool-riffle sequence, we evaluate the consequences of Ignoring small scale exchange flow induced by current-obstacle interactions, in channel-unit scale models. This study was conducted at the River Leith, a third-order stream situated within the Eden catchment, in the north west of England. The field site is located in the lower part of the catchment, and belongs to a three kilometre stretch that is known to be significant1y groundwater-fed by the underlying Permo-Trlassic sandstone. In summer, the stream's discharge can be as low as 0.03 m3 S -l. The 200 m study reach includes a succession of three pool-riffle sequences, located along a meander. The streambed consists primarily of gravels and cobbles. The first study examines at a high spatial and temporal resolution the variability of hydraulic conductivity (K), vertical hydraulic gradients (VHGs), and subsurface fiuxes, over a single riffle- step-pool sequence. A 20 m reach was equipped with a network of piezometers in order to determine the distribution ofVHGs and K. During a summer month, temporal variations ofVHGs were regularly surveyed and, for a subset of piezometers, the water level was automatically recorded at 15 min intervals by logging pressure transducers. Additionally, point-dilution tests were carried out on the same subset ofpiezometers. Whereas the distribution of vertical fluxes can be derived from K and VHG values, point-dilution tests allow for the estimation of horizontal fluxes where no VHG is detectable. Results indicate that, spatially, VHGs switched from upwelling to downwelling across lateral as well as longitudinal sections of the channel. Vertical fluxes appeared spatially more homogeneous than VHGs, suggesting that the latter can be a poor indicator of the intensity of flow. Finally, during flow events (high flows), some VHGs showed little or no fluctuations. This was interpreted as the result of a pressure wave propagating from upstream through highly diffusive alluvial sediments.
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Rice, Elliott Charles. "Sub-Cooled Pool Boiling Enhancement with Nanofluids." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3310.
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Phase-change heat transfer is an important process used in many engineering thermal designs. Boiling is an important phase change phenomena as it is a common heat transfer process in many thermal systems. Phase change processes are critical to thermodynamic cycles as most closed loop systems have an evaporator, in which the phase change process occurs. There are many applications/processes in which engineers employ the advantages of boiling heat transfer, as they seek to improve heat transfer performance. Recent research efforts have experimentally shown that nanofluids can have significantly better heat transfer properties than those of the pure base fluids, such as water.
The objective of this study is to improve the boiling curve of de-ionized water by adding aluminum oxide nanopthesiss in 0.1%, 0.2%, 0.3% and 0.4% wt concentrations in a sub-cooled pool boiling apparatus. Enhancement to the boiling curve can be quantified in two ways: (i) the similar heat fluxes of de-ionized water at smaller excess temperature, indicating similar quantity of heat removal at lower temperatures and (ii) greater heat fluxes than de-ionized water at similar excess temperatures indicating better heat transfer at similar excess temperatures. In the same fashion, the secondary objective is to increase the convective heat transfer coefficient due to boiling by adding different concentrations of aluminum oxide nanopthesiss.
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Navrouzoglou, Polmia. "Aspects of compliance in common pool resources." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14765.
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There is an inherent externality across generations in environmental economics: extensive use of the natural environment by the current generation may affect the welfare of future generations. The use of the natural environment includes not only the reduction of resource stocks, like fossil fuels and rain forests, but also the accumulation of pollution stocks. Efficient policy directed to changing the resource extraction and pollution profiles needs to take into account the internal and external forces driving resource markets and their impacts on the aggregate economy. But compliance to these measures is not warranted unless there is an implicit or explicit (or both) enforcement mechanism in place. The traditional approach to discuss the optimal centralized exploitation policy has been to assume that individuals are narrowly self-interested. Empirical evidence suggests, however, that individuals’ characteristics (heterogeneity) play a key role in resolving collective action problems. Chapter 1 develops a dynamic model of common renewable resources management where a centralized mechanism works together with a self-enforcement one—guided by social norms—to form an institution. The results provide a theoretical explanation for the evidence of why economies with abundance of resource stocks may not improve their institutions while others with scarcity of resource stocks may do. Institutional context is likely to determine the impact of trade liberalization on welfare and resource conservation. Chapter 2 follows the recent literature on trade and endogenously determined institution to investigate this link further. It combines a common renewable resource model with elements of moral hazard and identifies conditions under which countries escape the ‘tragedy of commons’. It shows that country characteristics and technologies in alternative sources of income determine how centralized institutions perform and whether there are gains 2 from trade. A key issue underlying global environmental protection is that international trade puts downward pressure on countries’ environmental standards. Chapter 3 explores—within an imperfectly competitive environment—the welfare implications of taxation when production causes environmental pollution (a global public bad) under two tax principles, ‘destination’ and ‘origin’. It shows that the noncooperative environmental tax policy does not always give rise to taxes that are too low in equilibrium, from welfare point of view, and identifies conditions under which the presence of a global public bad tilts the welfare comparison towards, interestingly, either tax principle.
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Bertsch, George M., Stephen B. Memory, and P. J. Marto. "Nucleate pool boiling characteristics of R-124." Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24202.
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Andrew, Margaret L. "Automatic analysis of gated blood pool studies." Thesis, University of Brighton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334330.
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Sharp, Jeremy A. "Sediment budget template applied to Aberdeen Pool." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-11092007-092448.
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Burns, Ethel. "Intrapartum birthing pool use in the UK." Thesis, Oxford Brookes University, 2014. https://radar.brookes.ac.uk/radar/items/5d0136b3-f1fa-4956-9e11-3d39261a279a/1/.
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Over past centuries, childbirth has become increasingly medicalised, with a shift to hospital births and an overuse of interventions for women at low risk of childbirth complication. In response, there has been a move towards normalising birth which has grown in strength over recent years. In this thesis, I describe a programme of research which aimed to examine whether intrapartum birthing pool use could make an important contribution to normalising childbirth for low risk women. Maternity stakeholders differ in their views of intrapartum birthing pool use, with some emphasising its potential to reduce interventions and increase spontaneous birth and others raising concerns that birthing pool use, particularly waterbirth, predisposes women and their newborn to an increased risk of adverse events and outcomes The focus of my programme of research was therefore on examining the efficacy and safety of intrapartum birthing pool use, and its potential contribution to normalising childbirth for healthy women. In the first stage of my research programme, I analysed prospectively collected data for 8,924 nulliparous and multiparous women who used a birthing pool during labour in their planned place of birth. In the second stage ̧ I explored the possibility of comparing intrapartum interventions and outcomes for women who used a birthing pool and women who could have, but chose not to use a birthing pool in one obstetric unit. Having found the unit was not representative of other obstetric units, in the third stage I used a bespoke dataset comprising routinely collected maternity data collated by Hospital Episode Statistics (HES) as a comparator for the birthing pool data. This research found that, for the birthing pool sample, adverse maternal and newborn outcomes were rare, and there were no differences in interventions and outcomes between care settings for multiparae or newborn. Comparisons with HES data showed significantly more birthing pool women had a spontaneous birth. This allays concerns over safety and supports the conclusion that intrapartum birthing pool use can make an important contribution to normalising birth.
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Kim, Sung Joong Ph D. Massachusetts Institute of Technology. "Pool boiling heat transfer characteristics of nanofluids." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41306.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.Includes bibliographical references (leaves 79-83).
Nanofluids are engineered colloidal suspensions of nanoparticles in water, and exhibit a very significant enhancement (up to 200%) of the boiling Critical Heat Flux (CHF) at modest nanoparticle concentrations (50.1% by volume). Since CHF is the upper limit of nucleate boiling, such enhancement offers the potential for major performance improvement in many practical applications that use nucleate boiling as their prevalent heat transfer mode. The nuclear applications considered are main reactor coolant for PWR, coolant for the Emergency Core Cooling System (ECCS) of both PWR and BWR, and coolant for in-vessel retention of the molten core during severe accidents in high-power-density LWR. To implement such applications it is necessary to understand the fundamental boiling heat transfer characteristics of nanofluids. The nanofluids considered in this study are dilute dispersions of alumina, zirconia, and silica nanoparticles in water. Several key parameters affecting heat transfer (i.e., boiling point, viscosity, thermal conductivity, and surface tension) were measured and, consistently with other nanofluid studies, were found to be similar to those of pure water. However, pool boiling experiments showed significant enhancements of CHF in the nanofluids. Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometry (EDS) analyses revealed that buildup of a porous layer of nanoparticles on the heater surface occurred during nucleate boiling. This layer significantly improves the surface wettability, as shown by measured changes in the static contact angle on the nanofluid-boiled surfaces compared with the pure-water-boiled surfaces. It is hypothesized that surface wettability improvement may be responsible for the CHF enhancement.
by Sung Joong Kim.
S.M.
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Clode, Sally Anne. "The effects of DNA precursor pool imbalance." Thesis, University of Surrey, 1989. http://epubs.surrey.ac.uk/847315/.
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Much evidence now exists to show that unbalanced DNA precursor pools cause DNA replicational infidelity in vitro. However, there are relatively few data with in vivo systems. Experiments were performed therefore, to determine if unbalanced precursor pools could be induced in vivo and if so, what affect this would have on various genetic markers. The nucleoside thymidine was shown to be completely non-toxic to the rat when administered orally, negative in the dominant lethal assay and was only marginally clastogenic in the micronucleus test. Treatment of human lymphocyte chromosomes with the essential amino acid arginine, arrested cell division possibly due to a predominance of arginine-rich histones limiting the chromatin-condensation during mitosis. Thymidine administered i. p. to mice induced marked increases in the proportions of abnormal sperm and the same effect, to a lesser extent, was seen in rats. The affected germ-cell stages were the mid - to late pachytene spermatocytes. These affects were probably due to base-misincorporation occuring during unscheduled DNA synthesis. The purine nucleoside adenine caused dose-related increases in the frequency of abnormal sperm in mice. In rats, a proportion of animals given 150mg/kg adenine showed high levels of abnormal sperm whilst others were unaffected. Examination of mice in the generation revealed that the damage to the germ-cells was transmissible. The simultaneous administration of deoxycytidine with excess thymidine to mice partly inhibited the effects on sperm morphology indicating that those effects were due to precursor pool imbalance. In addition, an analytical technique was developed to measure nucleosides and bases in the testes using HPLC. The method proved to be rapid, reproducible and quantitative and showed that 1hr following i. p. injection, thymidine levels in the testes increased markedly and thereafter quickly return to control levels. Finally, experiments were initiated to investigate the mechanisms underlying the formation of morphogically abnormal sperm. Polyacrylamide gel electrophoresis was used to identify membrane proteins in sperm from both control and treated animals.
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Brett, Justin. "Out of sight : re-imagining Graaff's pool." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/7803.
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Includes abstract.|Includes bibliographical references (leaves 45-46).This paper attempts to set out the parameters for a discussion of my Masters exhibition, entitled Out of Sight. It traces out the progress of this exhibition over the course of two years, attempting to account for the parallel development of my work across the media of sculpture, drawing and figure painting. As such the paper traces out my engagement with the two major thematic concerns of my masters exhibition: the representation of the gay male body and architectural space and site. The latter concerns both my strategies for the re-modelling of the gallery space, and my approach to the representation of the specific site of Graaff's Pool, on the Sea Point Promenade in Cape Town. I set out to explain how this site, located in a liminal space, geologically, architecturally and historically, becomes a nodal point for the concerns of my masters project. As such, I begin to trace out the .themes that intersect in my sculptural re-presentations of the site of Graaff's pool operating within zones of visibility and invisibility. My translation of this site into a site-specific installation in the gallery space intentionally disturbs the viewer's ability to see, in its treatment of scale and surface, as well as obstructs and directs their movement through the space. This discussion of visibility lin visibility extends to my treatment of the figure in drawings and watercolours, paying particular attention to my working of the surface in order to trouble the act of looking, hence the visibility or presence of the figure. This enables me to introduce ideas around the difficulties of representation in general, but particularly of the gay male body and the expression of a gay male subjectivity. I introduce into my discussion, if cautiously, the ideas of Michel Foucault and Mikhael Bakhtin. I do not in any way present a synthesis of these ideas, but begin to introduce their thinking as a way of reading specific works in the exhibition. As such, I trace out a possible connection between Foucault's idea of powerlknowledge and the invisible operation of disciplinary power as placing limits on the representation of the gay male body, and as such on its visibility.
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Tasevska, Tamara. "Intimate Spaces in Francois Ozons Swimming Pool." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1408096845.
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Latulippe, Christian. "Morpho-sedimentary dynamics of pool-riffle sequences in a gravel-bed river : bedload transport reversal and pool-riffle maintenance." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102671.
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Hydraulic and morpho-sedimentary differences between pools and riffles have always intrigued fluvial geomorphologists. Surprisingly, earlier explanations of pool-riffle morpho-sedimentology dynamic focus too exclusively on hydraulic patterns and neglect analysis of sediment transport. Understanding the mechanisms governing pool-riffle morpho-sedimentary dynamics, such as the sediment transport patterns represent a big challenge in fluvial geomorphology, considering the stochastic nature of bedload transport in gravel-bed rivers. The main objective of this thesis is to understand the two-dimensional relationship between hydraulic patterns, sediment transport patterns and morpho-sedimentary changes in pool-riffle sequences and to use these insights to understand how pool-riffle sequences maintain their form over time.This thesis is organized into four chapters. These chapters analyze hydraulic, sediment transport and morpho-sedimentary measurements collected on a riffle-pool-riffle sequence of the Des Coeurs river during seven controlled experimental floods. Chapter 2 tests the velocity reversal hypothesis (Keller, 1971), with results demonstrating that no velocity reversal was observed in the field, for peak flow up to 123% of the bankfull discharge. Chapter 3 demonstrates the existence of a bedload transport reversal: below 60% of bankfull discharge, sediment transport on the riffle exceeds transport in the pool; as discharge increased, more sediment was exported from the pool than imported, thereby maintaining the pool. Chapter 4 demonstrates that the bedload transport reversal is caused by the spatial heterogeneity of the sediment transport patterns (sediment supply, particle displacements and sediment sorting), which underlies the importance of developing two-dimensional bedload transport formulae. Chapter 5 tests the two-dimensional applicability of well-known bedload transport formulae developed in a one-dimensional environment. None of the formulae could be applied with accuracy in a two-dimensional environment. However, site-specific calibration considerably improves bedload transport rate and grain-size distribution prediction.
This thesis improves the understanding of the morpho-sedimentary dynamics of pool-riffle sequence; it argues that a purely hydraulic view of pool-riffle sequence is insufficient to understand their stability. It explains pool-riffle maintenance as a result of a bedload transport reversal caused by the spatial heterogeneity of the sediment transport patterns, and raises the importance of acquiring two-dimensional sediment transport data to improve two-dimensional bedload transport formulae.
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Malatji, Masadiki Violet. "A situational analysis of pool car management : the Department of Water Affairs and Forestry, Limpopo Province." Thesis, University of Limpopo (Turfloop Campus), 2008. http://hdl.handle.net/10386/851.
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Thesis (MBA) --University of Limpopo, 2008Despite crucial strategic value of fleets, most organizations have relegated the management of their vehicles as being very low on their list of priorities. Consequently, they are entrusting unsuitable people with management of their fleet. Without proper management, huge amounts of money are wasted through fuel fraud and with repairs being done too late or not at all, leaving expensive vehicles idle for months (Barrow 1999).It has been observed that managing fleets with the emphasis on bookkeeping and finance, rather than operational realities, leads to huge and unnecessary costs and massive fraud (Barrow 1998). Efficiency in fleet management is about having a fleet that works directly to support the organizational goals. It is imperative that a study was conducted to analyze the situation of pool cars in the Department of Water Affairs and Forestry (DWAF) in the Limpopo Province to ensure the efficiency in its fleet management
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Bradley, Patrick Joseph. "Suburban pool house~desert bath house a regionally-appropriate water concious living unit; justification for the single-family swimming pool." Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/192293.
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Iversen, Magnus. "Kartlegging av step-pool-morfologi med differensiell GPS." Thesis, Norges teknisk-naturvitenskapelige universitet, Geografisk institutt, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22934.
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Selected reaches of a step-pool-river in Oppdal, Norway were surveyed using differential GPS. Step-pools is a morphology characteristic of upland rivers with high gradient and large supply of coarse sediments, where channel units are restructured by floods of high magnitude. Differential GPS produces real-time corrected, highly accurate satellite-based positioning and height measurements. The goal of the study was to measure changes in morphologic variables from the spring flood period between 2011 and 2012, and also to determine if differential GPS produces valid, comparable results without subjective bias. The analysed field data proved inconclusive. For many reaches, the chosen measuring points from the two years were as much as 5 meters apart, while others overlapped well. In some cases, individual steps could be identified in data from both years, while other reaches showed little similarity. Statistical analysis of variables like step wavelength, height etc. showed relatively large deviations in the measured data. Researcher subjectivity must be seen as a large source of these deviations. Field classification of study units leaves different operators with the possibility of choosing different measuring points. In some cases, actual channel change could be verified with pictures, but lack of further verification in the form of discharge data makes it difficult to establish what is actual change and what is subjectivity. Some key improvements are listed for future studies: Train extensively in the use of D-GPS equipment before field work, document the field work with as many pictures as possible, and discuss the selection of measuring points during the actual field work. D-GPS, with the right preparations, has the potential of becoming a useful tool for fluvial-geomorphological field work.
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Lüttich, Torsten. "Modeling and identification of pool boiling heat transfer /." Düsseldorf : VDI-Verl, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014597255&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Johnejack, Kent Robert 1958. "SEDIMENT TRANSPORT IN STEP-POOL MOUNTAIN STREAMS (IDAHO)." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/291992.
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Touvet, Florence. "Provisioning the protection pool in WDM mesh networks." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405506.
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Zhang, Jianping. "Numerical modelling of pool fires and flame spread." Thesis, Kingston University, 2005. http://eprints.kingston.ac.uk/20319/.
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A historical analysis by Planas-Cuchi ‘et al’. showed that pool fires are one of the most frequent fire accidents in family homes, in the processing industries and in the transport of hazardous substances. Experimental and theoretical studies of the turbulence structure, fluid mechanics and heat transfer in pool fires, therefore, are of great importance for fire engineers to the understanding of the inherent mechanisms in pool fires. To this end, the first objective of this study is to investigate pool fires and improve their modelling by means of the computational fluid dynamics (CFD) approach, in which coupled descriptions of the controlling mechanisms of heat transfer, turbulence, combustion, and soot production are included. In order to improve the accuracy and applicability of existing turbulence and gas radiation models, advanced models including a four-equation turbulence model, a statistical narrow band (SNB) gas radiation model and a correlated-k (CK) gas radiation model are developed and implemented into the CFD code simulation of fires in enclosures (SOFIE) as the first step of this PhD study. The modified code is applied to three pool fire scenarios, i.e. methane, methanol and ethanol pool fires. Simulation results are numerically analysed, and quantitatively compared between the predictions obtained with different models, as well as with experimental data. Results confirm the improvements in accuracy from advanced models-in terms of temperature predictions, up to 59% relative difference for the four-equation turbulence model and 8.8% for the SNB models are found, though more CPU time is required - the four-equation model requires about 10% more than the two-equation models investigated and the SNB model requires 4.8 times of the traditional weighted-sum-of-grey-gas (WSGG) model. As shown in the Methane fire simulations, the CK model yields results very close to the SNB model, while 2.7 times more time consuming, and thus the CK model is not further studied in this work. After the analysis of pool fires mechanisms and validation of the incorporated models, this research is focused on the numerical and experimental investigation of upward flame spread over solid fuel surfaces. A non-charring pyrolysis model has been developed in SOFIE and is used in this study. A formulation of Quintiere is implemented and employed for predicting the flame spread rate. The pyrolysis model coupled with the filed model is employed to simulate an upward flame spread experiment conducted as part of this work by the author’s research group. In the experiment, temperature, gas velocity, and radiative heat fluxes are measured respectively with thermocouples, particle-image-velocimetry (PIV) and Gunner's radiometers. CFD predictions for surface heat fluxes, the gas velocity, surface temperatures, the flame spread rate, the mass burning rate and the heat release rate are evaluated. The simulation results are generally in good agreement with the experiment. The last objective is to assess the effect of gas radiation models on upward flame spread simulations. Further predictions are attempted for two, more complex flame spread configurations, one involving a 5mX0.6m polymethylmethacrylate (PMMA) wall while the other representing flame spread along the corner. Quantitative and qualitative comparisons are made between the predictions and experimental data. Significant improvement is made by the SNB model over the WSGG model. Although the WSGG approach yields relatively closer results to the SNB approach for the simulations of the steady problem - pool fires, it produces larger discrepancies for those of the transient problem - flame spread, in which the accurate predictions of combined surface heat fluxes are of particular importance.
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Newton, Richard. "Vertical profiling in the west Pacific warm pool." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/vertical-profiling-in-the-west-pacific-warm-pool(8c89d0ef-dc88-44d6-ad49-81cc34d5e662).html.
Full textAbstract:
This thesis consists of three distinct parts of CAST, CONTRAST and ATTREX, which were aircraft and field campaigns in the West Pacific in January-March 2014. The first section comprises of ozonesonde measurements from Manus Island, Papua New Guinea. A contamination issue affected the first 14 ozonesondes, and so particular care was required to characterize the background current, and as a result, a 'hybrid' background current correction was developed, which combines a constant correction with a pressure dependent correction. Collocated measurements with the CONTRAST aircraft - the NCAR Gulfsteam V - suggests the new hybrid correction produces better ozonesonde profiles than the other corrections that are found in the literature. The results of the ozonesonde measurements revealed a low-ozone event, with minimum ozone concentrations of ~12 ppbv, which was coincident with an easterly jet, and traced back to an area of deep convection: clean marine boundary layer air was uplifted into the tropical tropopause layer (TTL) and then advected in the easterly jet across to Manus Island. The second section attempted to find more examples of low-ozone conditions in the TTL from the aircraft data. The ATTREX aircraft - the NASA Northrop Grumman Global Hawk - observed ozone concentrations of ~10 ppbv in the Southern Hemisphere in proximity of tropical storm Lusi. Whole air samples from all three aircraft suggests the low-ozone air had recently encountered the boundary layer, with enhanced concentrations of surface-generated very short lived substances (VSLSs) compared to air with higher ozone concentrations. No low-ozone events were found in the Northern Hemisphere, even in the vicinity of tropical cyclone Faxai. The third section explores the low-ozone events in the WRF-Chem (Weather Research and Forecasting - with chemistry) in order to see whether the model was capable of recreating the low-ozone event measured by the ozonesondes on 21-23 February as a case study. The WRF-Chem simulation did correctly reproduce the large convective storm in a similar area to that observed by satellites, and surface tracers were uplifted in large quantities as hypothesized. However, no evidence of injection of air into the stratosphere was found in the simulation, and, rather than uplift directly from the surface, mixing of air in the boundary layer followed by uplift into the TTL was the main mechanism for producing the low-ozone event.