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Phung, Viet-Anh. "Input Calibration, Code Validation and Surrogate Model Development for Analysis of Two-phase Circulation Instability and Core Relocation Phenomena." Doctoral thesis, KTH, Kärnkraftssäkerhet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202957.
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Code validation and uncertainty quantification are important tasks in nuclear reactor safety analysis. Code users have to deal with large number of uncertain parameters, complex multi-physics, multi-dimensional and multi-scale phenomena. In order to make results of analysis more robust, it is important to develop and employ procedures for guiding user choices in quantification of the uncertainties. The work aims to further develop approaches and procedures for system analysis code validation and application to practical problems of safety analysis. The work is divided into two parts. The first part presents validation of two reactor system thermal-hydraulic (STH) codes RELAP5 and TRACE for prediction of two-phase circulation flow instability. The goals of the first part are to: (a) develop and apply efficient methods for input calibration and STH code validation against unsteady flow experiments with two-phase circulation flow instability, and (b) examine the codes capability to predict instantaneous thermal hydraulic parameters and flow regimes during the transients. Two approaches have been developed: a non-automated procedure based on separate treatment of uncertain input parameters (UIPs) and an automated method using genetic algorithm. Multiple measured parameters and system response quantities (SRQs) are employed in both calibration of uncertain parameters in the code input deck and validation of RELAP5 and TRACE codes. The effect of improvement in RELAP5 flow regime identification on code prediction of thermal-hydraulic parameters has been studied. Result of the code validations demonstrates that RELAP5 and TRACE can reproduce qualitative behaviour of two-phase flow instability. However, both codes misidentified instantaneous flow regimes, and it was not possible to predict simultaneously experimental values of oscillation period and maximum inlet flow rate. The outcome suggests importance of simultaneous consideration of multiple SRQs and different test regimes for quantitative code validation. The second part of this work addresses core degradation and relocation to the lower head of a boiling water reactor (BWR). Properties of the debris in the lower head provide initial conditions for vessel failure, melt release and ex-vessel accident progression. The goals of the second part are to: (a) obtain a representative database of MELCOR solutions for characteristics of debris in the reactor lower plenum for different accident scenarios, and (b) develop a computationally efficient surrogate model (SM) that can be used in extensive uncertainty analysis for prediction of the debris bed characteristics. MELCOR code coupled with genetic algorithm, random and grid sampling methods was used to generate a database of the full model solutions and to investigate in-vessel corium debris relocation in a Nordic BWR. Artificial neural networks (ANNs) with classification (grouping) of scenarios have been used for development of the SM in order to address the issue of chaotic response of the full model especially in the transition region. The core relocation analysis shows that there are two main groups of scenarios: with relatively small (<20 tons) and large (>100 tons) amounts of total relocated debris in the reactor lower plenum. The domains are separated by transition regions, in which small variation of the input can result in large changes in the final mass of debris. SMs using multiple ANNs with/without weighting between different groups effectively filter out the noise and provide a better prediction of the output cumulative distribution function, but increase the mean squared error compared to a single ANN.Validering av datorkoder och kvantifiering av osäkerhetsfaktorer är viktiga delar vid säkerhetsanalys av kärnkraftsreaktorer. Datorkodanvändaren måste hantera ett stort antal osäkra parametrar vid beskrivningen av fysikaliska fenomen i flera dimensioner från mikro- till makroskala. För att göra analysresultaten mer robusta, är det viktigt att utveckla och tillämpa rutiner för att vägleda användaren vid kvantifiering av osäkerheter.Detta arbete syftar till att vidareutveckla metoder och förfaranden för validering av systemkoder och deras tillämpning på praktiska problem i säkerhetsanalysen. Arbetet delas in i två delar.Första delen presenterar validering av de termohydrauliska systemkoderna (STH) RELAP5 och TRACE vid analys av tvåfasinstabilitet i cirkulationsflödet.Målen för den första delen är att: (a) utveckla och tillämpa effektiva metoder för kalibrering av indatafiler och validering av STH mot flödesexperiment med tvåfas cirkulationsflödeinstabilitet och (b) granska datorkodernas förmåga att förutsäga momentana termohydrauliska parametrar och flödesregimer under transienta förlopp.Två metoder har utvecklats: en icke-automatisk procedur baserad på separat hantering av osäkra indataparametrar (UIPs) och en automatiserad metod som använder genetisk algoritm. Ett flertal uppmätta parametrar och systemresponser (SRQs) används i både kalibrering av osäkra parametrar i indatafilen och validering av RELAP5 och TRACE. Resultatet av modifikationer i hur RELAP5 identifierar olika flödesregimer, och särskilt hur detta påverkar datorkodens prediktioner av termohydrauliska parametrar, har studerats.Resultatet av valideringen visar att RELAP5 och TRACE kan återge det kvalitativa beteende av två-fas flödets instabilitet. Däremot kan ingen av koderna korrekt identifiera den momentana flödesregimen, det var därför ej möjligt att förutsäga experimentella värden på svängningsperiod och maximal inloppsflödeshastighet samtidigt. Resultatet belyser betydelsen av samtidig behandling av flera SRQs liksom olika experimentella flödesregimer för kvantitativ kodvalidering.Den andra delen av detta arbete behandlar härdnedbrytning och omfördelning till reaktortankens nedre plenumdel i en kokarvatten reaktor (BWR). Egenskaper hos härdrester i nedre plenum ger inledande förutsättningar för reaktortanksgenomsmältning, hur smältan rinner ut ur reaktortanken och händelseförloppet i reaktorinneslutningen.Målen i den andra delen är att: (a) erhålla en representativ databas över koden MELCOR:s analysresultat för egenskaperna hos härdrester i nedre plenum under olika händelseförlopp, och (b) utveckla en beräkningseffektiv surrogatsmodell som kan användas i omfattande osäkerhetsanalyser för att förutsäga partikelbäddsegenskaper.MELCOR, kopplad till en genetisk algoritm med slumpmässigt urval användes för att generera en databas av analysresultat med tillämpning på smältans omfördelning i reaktortanken i en Nordisk BWR.Analysen av hur härden omfördelas visar att det finns två huvudgrupper av scenarier: med relativt liten (<20 ton) och stor (> 100 ton) total mängd omfördelade härdrester i nedre plenum. Dessa domäner är åtskilda av övergångsregioner, där små variationer i indata kan resultera i stora ändringar i den slutliga partikelmassan. Flergrupps artificiella neurala nätverk med klassificering av händelseförloppet har använts för utvecklingen av en surrogatmodell för att hantera problemet med kaotiska resultat av den fullständiga modellen, särskilt i övergångsregionen.
QC 20170309
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Pursell, Mark Edward. "Two Blades Come Together: Stories." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3932.
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This collection of seven short stories details the emotional triumphs and complications of characters whose lives are altered by issues of sexuality and disconnection. An adolescent girl feels her father slipping away from her and, in turn, willfully destroys the imaginary world of the boy she babysits; a speech therapist struggles to make headway with a young patient while finding himself unable to communicate with his ex-lover; a gay poet cheats on his boyfriend in a desperate attempt to fuel his failing art. The dramatis personae of Two Blades Come Together is comprised of individuals who struggle towards grace and happiness but are thwarted by their inability to fit neatly into the lives of those they love. Several of the stories approach these issues through the framework of contemporary myth, exploring how fairy tales and the supernatural act upon the characters' relationships and the way they perceive their situations. The heroines of "Proof of Snow" and "The Pill Woman" are both affected by the unseen; one suffers under the strange influence of her brother even after his death, while the other must make a decision to uphold her fairy-tale world or dismantle it. In these stories, the tangibility of the supernatural is elusive and unproven, but the altered perceptions of the protagonists and their actions because of it are extremely real, with extremely real consequences. The collection also explores and tests the boundaries between poetry and fiction, pushing always towards language that is aesthetic and musical while not sacrificing the momentum and architecture of prose. Two Blades Come Together incorporates linguistic ideas from poets as varied as contemporary surrealists Laura Kasischke and Mary Ruefle to the grounded wryness of Tony Hoagland and Lynda Hull, weaving poetic language with narrative, hybridizing the qualities of fiction and poetry in an attempt to create a unique, musical vision of short fiction that is both functional and artful.M.F.A.
Department of English
Arts and Humanities
Creative Writing MFA
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Ahmadi, Mohammad Mehdi. "Analysis of cone tip resistance in sand." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0014/NQ56492.pdf.
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McCollum, Kyle. "Top ten building code violations in Florida." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008822.
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Misoczki, Rafael. "Two Approaches for Achieving Efficient Code-Based Cryptosystems." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00931811.
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La cryptographie basée sur les codes n'est pas largement déployée dans la pratique. Principalement à cause de son inconvénient majeur: des tailles de clés énormes. Dans cette thèse, nous proposons deux approches différentes pour résoudre ce problème. Le premier utilise des codes algébriques, présentant un moyen de construire des codes de Goppa qui admettent une représentation compacte. Ce sont les Codes de Goppa p-adiques. Nous montrons comment construire ces codes pour instancier des systèmes de chiffrement à clé publique, comment étendre cette approche pour instancier un schéma de signature et, enfin, comment généraliser cet approche pour définir des codes de caractéristique plus grande au égale à deux. En résumé, nous avons réussi à produire des clés très compact basé sur la renommée famille de codes de Goppa. Bien qu'efficace, codes de Goppa p-adiques ont une propriété non souhaitable: une forte structure algébrique. Cela nous amène à notre deuxième approche, en utilisant des codes LDPC avec densité augmentée, ou tout simplement des codes MDPC. Ce sont des codes basés sur des graphes, qui sont libres de structure algébrique. Il est très raisonnable de supposer que les codes MDPC sont distinguable seulement en trouvant des mots de code de poids faible dans son dual. Ceci constitue un avantage important non seulement par rapport à tous les autres variantes du système de McEliece à clés compactes, mais aussi en ce qui concerne la version classique basée sur les codes de Goppa binaires. Ici, les clés compactes sont obtenus en utilisant une structure quasi-cyclique.
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GARRIDO, DIEGO PINTO DE. "A SYSTEM TO CODE IMAGES USING TWO CHANNELS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1989. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14178@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho é desenvolvida uma técnica de compressão de imagens onde a imagem a ser comprimida é inicialmente dividida em duas partes: uma de baixa freqüência, que representa o brilho geral, sem os contornos abruptos, e outra de alta freqüência, contendo a informação de bordas abruptas. A imagem de baixa freqüência é codificada então através de uma transformada ortonormal, enquanto a de alta freqüência é codificada através de quantização vetorial. A qualidade visual da imagem reconstruída é comparável aos codificadores existentes de igual complexidade, para taxas na faixa de 0.6 a 0.8 bits/pixel.
In this work it is presented na image compression technique where the image to be compressed is first split into two parts: a low-pass one, which represents the general área brightness, without Sharp contours, and a high-pass part, containing Sharp edge information. The low-frequency image in then coded by a orthonormal transform technique and the high-frequency one is coded using vector quantization. The visual quality of the reconstructed image is comparable to that produced by existing coders with similar complexity, for rates in the range 0.6-0.8 bits/pixel.
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Park, Youn Jung. "The political economy of country code top level domains." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available, full text:, 2008. http://wwwlib.umi.com/cr/syr/main.
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Miller, Mark S. "Advances in elliptical-core two-mode optical fiber sensors." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41617.
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Methods designed to improve the practicality of the elliptical-core two-mode optical fiber sensors for use in real-life applications are presented. The improvements include the development of insensitive lead fibers and an optical device which allows fringe counting at the output of the sensor. The insensitive leads eliminate extraneous perturbations and effectively isolate the sensing region. The fringe counting optics are designed to generate quadrature-phase shifted signals, thereby allowing the determination of whether the strain is increasing or decreasing.
Work performed to advance the understanding of the effect of sensor placement within a composite specimen is also presented. Optical fiber sensors are embedded between different laminae of a graphite-epoxy composite panel, and the outputs of the sensors are shown to be proportional to the distance of the sensor from the neutral axis.Master of Science
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James, Russell W., and James C. Bevier. "ACQUISITION AND DISTRIBUTION OF TSPI DATA USING COTS HARDWARE OVER AN ETHERNET NETWORK." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/607477.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe Western Aeronautical Test Range (WATR) operates the ground stations for research vehicles operating at the NASA Dryden Flight Research Center (DFRC). Recently, the WATR implemented a new system for distributing Time, Space, and Position Information (TSPI) data. The previous system for processing this data was built on archaic hardware that is no longer supported, running legacy software with no upgrade path. The purpose of the Radar Information Processing System (RIPS) is to provide the ability to acquire TSPI data from a variety of sources and process the data for subsequent distribution to other destinations located at the various DFRC facilities. RIPS is built of commercial, off the shelf (COTS) hardware installed in Personal Computers (PC). Data is transported between these computers on a Gigabit Ethernet network. The software was developed using C++ with a modular, object-oriented design approach.
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Piccoli, Mario Luiz. "Seleção genômica em bovinos de corte." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/128119.
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Objetivou-se com este trabalho: (1) avaliar parâmetros de diversidade genética e de estrutura populacional com base nas raças Angus, Devon, Hereford e Shorthorn. Taxa de endogamia (ΔF), tamanho efetivo (Ne), grau de parentesco, entre outros parâmetros, foram estimados para fornecer subsídios aos programas de melhoramento. Os parâmetros indicaram adequada diversidade genética, com Ne variando entre 128 no Devon e 303 no Shorthorn e ΔF variando entre 1,50 no Angus e 3,92 no Devon; (2) avaliar estratégias de imputação de genótipos utilizando dados de Braford e Hereford através de painéis de baixa densidade (3K, 6K, 8K, 15K e 20K) para os painéis de 50K e 777K. Para o painel de 777K, também foram utilizados na imputação os painéis de 50K, 90iK e 90tK. Os resultados indicaram que, com exceção do painel de 3K, todos os demais painéis de baixa densidade poderiam ser utilizados como base visando à imputação para o painel de 50K e também que os painéis de média densidade (50K, 90iK e 90tK), poderiam ser utilizados como base na imputação para o painel de 777K. Esses painéis mostraram-se eficientes e possuem, em geral, custos compatíveis com a atividade pecuária; (3) avaliar a acurácia de predição dos valores genômicos utilizando alguns painéis de baixa densidade (8K e 15K) imputados para o painel de 50K, relacionando os resultados com o uso do painel original de 50K. A acurácia do valor genômico direto (DGV) e do valor genético genômico (GEBV) com o valor genético (EBV) utilizando painéis imputados ou não, indicaram que não houveram diferenças em acurácia e as perdas em acurácia por utilizar os painéis imputados ficaram entre -0,0002 e -0,0021 dependendo do painel, do cenário e da característica analisada; (4) usar marcadores moleculares na seleção genômica testando dois métodos BLUP (procedimento de passo único ou de multi passo) com dados simulados de bovinos de corte. Os resultados demonstraram, com base nos parâmetros estudados, igualdade de resultados entre os dois procedimentos; (5) avaliar a viabilidade do uso da seleção genômica usando dados de campo de animais Braford e Hereford, testando os dois métodos BLUP (passo único e multi passo). Os resultados com base nos parâmetros estudados, mostraram que as acurácias de predição do DGV e do GEBV foram iguais nos dois procedimentos, porém no método multi passo as predições genômicas foram menos viesadas.The aim of this work were: (1) to evaluate parameters of genetic diversity and population structure based on Angus, Devon, Hereford and Shorthorn breeds. Inbreeding rate (ΔF), effective size (Ne), relatedness, among other parameters, were estimated to provide subsidies for breeding programs. The parameters indicated a good genetic diversity, with Ne ranging from 128 in Devon to 303 in Shorthorn and ΔF ranging from 1.50 in Angus to 3.92 in Devon; (2) to evaluate strategies of genotype imputation with Braford and Hereford beef data using low density panels (3K, 6K, 8K, 15K and 20K) for 50K and 777K panels. For imputation to the 777K panel were also used the 50K, 90iK and 90tK panels. The results indicated that, except for the 3K panel, all other low density panels could be used of imputation the 50K panel and also the medium density panels (50K, 90iK and 90tK), could be used of imputation the 777K panel. These panels have been efficient and have, in general, compatible costs of the beef cattle operation; (3) to evaluate the accuracy of genomic prediction using some low density panels (8K and 15K) imputed to the 50K panel, relating the results with 50K original panel. The accuracy of direct genomic value (DGV) and genomic estimated breeding value (GEBV) with estimated breeding value (EBV) using imputed or not panels, indicated that there were no differences in accuracy and the losses in accuracy by using the imputed panels ranged from -0.0002 to -0.0021 depending on the panel, the scenario and the trait; (4) to use molecular markers in genomic selection testing two BLUP methods (single and two steps) with simulated beef cattle data. The results showed, based on the parameters studied, equality of results between the two methods; (5) to evaluate the viability of using the genomic selection using Braford and Hereford beef cattle and testing the two BLUP methods (single and two steps). The results, based on the parameters studied, showed that DGV and GEBV accuracies were similar in both methods, but the genomic predictions were less biased with then two-step method.
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Magnanti, Thomas L., Prakash Mirchandani, and Rita Vachani. "The Convex Hull of Two Core Capacitated Network Design Problems." Massachusetts Institute of Technology, Operations Research Center, 1990. http://hdl.handle.net/1721.1/5164.
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The network loading problem (NLP) is a specialized capacitated network design problem in which prescribed point-to-point demand between various pairs of nodes of a network must be met by installing (loading) a capacitated facility. We can load any number of units of the facility on each of the arcs at a specified arc dependent cost. The problem is to determine the number of facilities to be loaded on the arcs that will satisfy the given demand at minimum cost. This paper studies two core subproblems of the NLP. The first problem, motivated by a Lagrangian relaxation approach for solving the problem, considers a multiple commodity, single arc capacitated network design problem. The second problem is a three node network; this specialized network arises in larger networks if we aggregate nodes. In both cases, we develop families of facets and completely characterize the convex hull of feasible solutions to the integer programming formulation of the problems. These results in turn strengthen the formulation of the NLP.
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Ligator, Jessica. "Top ten building code violations found by Florida building officials." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0014343.
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Chatzopoulos, E., Sean M. Couch, W. David Arnett, and F. X. Timmes. "CONVECTIVE PROPERTIES OF ROTATING TWO-DIMENSIONAL CORE-COLLAPSE SUPERNOVA PROGENITORS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621238.
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We explore the effects of rotation on convective carbon, oxygen, and silicon shell burning during the late stages of evolution in a 20 M-circle dot star. Using the Modules for Experiments in Stellar Astrophysics we construct one-dimensional (1D) stellar models both with no rotation and with an initial rigid rotation of 50% of critical. At different points during the evolution, we map the 1D models into 2D and follow the multidimensional evolution using the FLASH compressible hydrodynamics code for many convective turnover times until a quasi-steady state is reached. We characterize the strength and scale of convective motions via decomposition of the momentum density into vector spherical harmonics. We find that rotation influences the total power in solenoidal modes, with a slightly larger impact for carbon and oxygen shell burning than for silicon shell burning. Including rotation in 1D stellar evolution models alters the structure of the star in a manner that has a significant impact on the character of multidimensional convection. Adding modest amounts of rotation to a stellar model that ignores rotation during the evolutionary stage, however, has little impact on the character of the resulting convection. Since the spatial scale and strength of convection present at the point of core collapse directly influence the supernova mechanism, our results suggest that rotation could play an important role in setting the stage for massive stellar explosions.
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Tampion, Ariadne Ann. "Double-frequency stator core vibration in large two-pole turbogenerators." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/209755/.
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This Thesis describes the development of a model to represent the variation with load and excitation of double-frequency stator core vibration in large two-pole turbogenerators. The model has a dual purpose, serving first to investigate causes of this effect; secondly to provide predictions suitable for an on-line monitoring scheme. Electromagnetic forces at the stator bofe are represented as tooth-tip forces formed from the integral of Maxwell stress over a slot pitch. Conversion to core-back vibration is by means of transfer coefficients derived from structural finite-element analyses of isolated core models. A simple model, in which the rotor and stator are considered infinitely permeable with sinusoidally distributed sheets of surface current, is used to demonstrate the primary cause of the variation of core vibration: a load-dependent circumferential stress distribution combining with the radial distribution at phase displacements dependent on excitation. This model is insufficient for prediction purposes, hence a more powerful model is developed to take into account slotting and magnetic saturation by means of regions of finite permeability, anisotropic in the slotted zones. The windings are represented by Fourier series of current sheets. This model shows the importance of magnetic saturation; also that the variation of vibration with active load is dependent on rotor slotting. Comparison of predicted vibration levels with test measurements from three machines shows that the absolute level of core-back vibration is pricipally dependent on the support structure. Two of the effects in evidence are examined in a qualitative study.
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Brezjanovic-Shogren, Jelena. "Analysis of code-switching and code-mixing among bilingual children: two case studies of Serbian-English language interaction." Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/5051.
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This research attempts to expose the patterns of language behavior of two five-year old bilingual children through the analysis of the code-switching and code-mixing occurrences in their everyday conversational interactions. The goal of the study is to analyze the code choice and the motivation behind such pattern in order to see whether there are any differences between the two case studies, and most of all, what is causing these differences in linguistic behavior to occur. Data used in analysis was collected during informal conversations recorded in home domain of the two families studied. The recorded data along with the observational notes collected was then analyzed sentence by sentence and separated into several dyads in order to understand the relation between the children‟s code-switching/code-mixing and the interlocutor.
It is concluded that most common motivation behind their code choice is solidarity –establishing “we code”, referential, directive, and reactive to positive/ negative face and power. The major difference between the two children‟s language behavior regarding code choice is rather in the patterns of code-switching versus code-mixing. The boy, being a natural bilingual who acquired the second language (L2) simultaneously is more prone to code-switch in certain situations. On the other hand, the girl, who acquired L2 consecutively and therefore adopted the syntax of Serbian language, uses more code-mixing during her conversational interactions. This showed close connection of the linguistic behavior with the linguistic environment exposing essential mechanisms of children‟s ability to adjust their language skills to their conversational needs.Thesis (M.A.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Anthropology
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Eshleman, Carol R. "Twin Core: An Exploration of Twins in the Wizarding World." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1793.
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The motif of twins is one that permeates strongly throughout the Harry Potter series. Fred and George as a pair are immensely popular with fans, and the “very curious” twinship of Harry and Voldemort’s wands is a relationship greatly explored in the saga. In my paper, I shall further explore this prominent Potter motif and delve into the origins and symbolism behind this twinship. I will also recall the dark conclusion to the tale of the Weasley twins. The death of Fred as related to the series’ theme as a whole and the death of Harry in the attempt to remove his parasitic twin, Voldemort’s unintended horcrux, will be discussed. There will also be exploration of missing and broken twins, for example, where is Romulus since we know a Remus? Why are Padma and Parvati in different houses? What is the symbolism of Harry’s broken wand? I will discuss how Voldemort’s creation of horcruxes is an intentional twinning of his self, and thus a mutation of nature. An exploration of numerology in relation to this twin discussion will also be included. This paper will show that the motif of twins is not just an interesting addition to the Potter novels but rather a tie-in to the story’s core of insisting on duality when the truth is in wholeness.
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Carvalho, Deborah Pereira. "Protease em dietas contendo farinhas de origem animal para frangos de corte." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6221.
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Research with use of exogenous enzymes in feed for broiler, has shown its advantages in improving the digestibility and nutrient availability for birds, resulting in better performance. The objective of this study was to evaluate the effect of adding "on the top" the enzyme protease 0.05% (Cybenza DP 100) in diets for broilers containing animal meal. Two experiments were conducted divided into 4 treatments each experiment. In both experiments were using the same treatments, the treatments offered were: T1 - corn-based feed and soybean meal, T2 - corn-based feed and soybean meal with addition of protease, T3 - based feed corn and soybean meal with addition of meat, feathers and viscera, T4 - corn-based feed and soybean meal with addition of meat, feathers and viscera, with the addition of protease. The "experiment 1" was carried out with 320 chicks Cobb500 strain of 1 to 21 days. The experimental design was completely randomized, divided into batteries, with 4 treatments and 8 repetitions each containing 10 broiler per cage. The variables analyzed were: digestibility and performance variables. The "Experiment 2" was carried out with 720 chicks Cobb500 strain of 1 to 42 days. The experimental design was completely randomized, divided into box with 4 treatments and 6 repetitions each containing 30 broiler per box. The analyzed variables were: performance and Biometry of the gastrointestinal tract organs and the intestines and bowel. In all treatments the data were subjected to analysis of variance, and means were compared by Tukey test at 5% significance. In the " experiment 1 " it was observed that supplementation of the enzyme protease improved the feed conversion only in the pre- initial stage , but proved advantageous to use also in the initial phase , because even with the reduction in nutrient levels the results did not differ . In the " second experiment " it was observed that the use of animal meal for broilers from 1 to 21 days of age proved advantageous , since treatments with animal meal in their composition showed better weight gain and lower feed intake . The protease enzyme supplementation improved viability.
Pesquisas com a utilização de enzimas exógenas na alimentação de frangos de corte, tem evidenciado as suas vantagens em melhorar a digestibilidade e disponibilidade de nutrientes para os frangos, resultando em melhor desempenho. Objetivou-se com o presente trabalho avaliar o efeito da adição “on the top” da enzima protease 0,05% (Cybenza DP 100) em dietas para frangos de corte contendo farinhas de origem animal. Foram conduzidos dois experimentos divididos em 4 tratamentos cada experimento. Em ambos os experimentos foram utilizando os mesmos tratamentos, os tratamentos oferecidos foram: T1 - ração à base de milho e farelo de soja, T2 - ração à base de milho e farelo de soja, com adição de protease, T3 - ração à base de milho e farelo de soja com inclusão de farinha de carne, penas e vísceras, T4 - ração à base de milho e farelo de soja com inclusão de farinha de carne, penas e vísceras, com adição de protease. O “experimento 1” foi realizado com 320 pintos da linhagem Cobb500 de 1 a 21 dias. O delineamento experimental foi inteiramente casualizado, dividido em baterias, com 4 tratamentos e 8 repetições cada, contendo 10 frangos por gaiola. As variáveis analisadas foram: digestibilidade e variáveis de desempenho. O “experimento 2” foi realizado com 720 pintos da linhagem Cobb500 de 1 a 42 dias. O delineamento experimental adotado foi inteiramente casualizado, dividido em box, com 4 tratamentos e 6 repetições cada, contendo 30 frangos por box. As Variáveis analisadas foram: desempenho e Biometria de órgãos do trato gastrointestinal e do intestino e do intestino. Em todos os tratamentos os dados foram submetidos a análise de variância, e as médias foram comparadas pelo teste de Tukey a 5% de significância. No “experimento 1” foi observado que a suplementação da enzima protease melhorou a conversão alimentar apenas na fase pré-inicial, porém se mostrou vantajoso a sua utilização também na fase inicial, pois mesmo com a redução dos níveis nutricionais os resultados não diferiram entre si. No “experimento 2” foi observado que a utilização da farinha de origem animal para frangos de corte de 1 a 21 dias de idade se mostrou vantajosa, uma vez que os tratamentos que receberam farinhas de origem animal em sua composição apresentaram um melhor ganho de peso e menor consumo de ração. A suplementação da enzima protease melhorou a viabilidade.
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Mosher, Scott William. "A Variational Transport Theory Method for Two-Dimensional Reactor Core Calculations." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5070.
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A Variational Transport Theory Method for
Two-Dimensional Reactor Core Calculations
Scott W. Mosher
110 Pages
Directed by Dr. Farzad Rahnema
It seems very likely that the next generation of reactor analysis methods will be based largely on neutron transport theory, at both the assembly and core levels. Signifi-cant progress has been made in recent years toward the goal of developing a transport method that is applicable to large, heterogeneous coarse-meshes. Unfortunately, the ma-jor obstacle hindering a more widespread application of transport theory to large-scale calculations is still the computational cost.
In this dissertation, a variational heterogeneous coarse-mesh transport method has been extended from one to two-dimensional Cartesian geometry in a practical fashion. A generalization of the angular flux expansion within a coarse-mesh was developed. This allows a far more efficient class of response functions (or basis functions) to be employed within the framework of the original variational principle. New finite element equations were derived that can be used to compute the expansion coefficients for an individual coarse-mesh given the incident fluxes on the boundary. In addition, the non-variational method previously used to converge the expansion coefficients was developed in a new and more thorough manner by considering the implications of the fission source treat-ment imposed by the response expansion.
The new coarse-mesh method was implemented for both one and two-dimensional (2-D) problems in the finite-difference, multigroup, discrete ordinates approximation. An efficient set of response functions was generated using orthogonal boundary conditions constructed from the discrete Legendre polynomials. Several one and two-dimensional heterogeneous light water reactor benchmark problems were studied. Relatively low-order response expansions were used to generate highly accurate results using both the variational and non-variational methods. The expansion order was found to have a far more significant impact on the accuracy of the results than the type of method. The varia-tional techniques provide better accuracy, but at substantially higher computational costs. The non-variational method is extremely robust and was shown to achieve accurate re-sults in the 2-D problems, as long as the expansion order was not very low.
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Taylor, John E. "COTS software decision support models for USPACOM's Theater Engagement Plan (TEP)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384595.
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Thesis (M.S. in Systems Engineering) Naval Postgraduate School, Sept. 2000.Thesis advisor(s): Powell, James R.; Buettner, Raymond R. "September 2000." Includes bibliographical references (p. 139-141). Also available in print.
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Olafuyi, Olalekan Adisa Petroleum Engineering Faculty of Engineering UNSW. "Experimental investigation of two-phase flow properties of small core samples." Awarded by:University of New South Wales. Petroleum Engineering, 2008. http://handle.unsw.edu.au/1959.4/43391.
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This thesis presents an experimental investigation of two-phase flow properties of porous rock samples having different scales ranging from micro-CT imaging to conventional core plug scales. Advances in micro-CT imaging of porous materials provide the opportunity to extract representative networks from the images. This improves the predictive capability of porescale network models to predict multiphase flow properties. However, all these predictions need to be validated with laboratory data. Micro-CT imaging is currently limited to small sample sizes, having bulk volumes of the order of 0.1 cm??. Conventional core plugs, however, have sizes several orders of magnitude larger than that (bulk volumes of 10 cm?? or larger). The aim of this thesis is to investigate the scale effect on laboratory data and to provide reliable experimental data which can be used to test the predictive value of microCT based network models. Berea and Bentheim sandstones and Mount Gambier carbonate were used in the experiments. The core samples were thoroughly cleaned in order to obtain strongly, uniform water-wet conditions. Simple well-characterized fluid systems were chosen in the experiments: Air-brine fluid-system for drainage capillary pressure, resistivity index and spontaneous imbibition experiments while oil-brine fluid-system for wettability and relative permeability measurements. Drainage capillary pressure, resistivity index, relative permeability and spontaneous imbibition measurements were made on the cores having bulk volumes ranging from 0.1 to 12 cm??. Previous studies have shown that experiments at this scale are still lacking. The wettability was tried to keep strongly water-wet for all experiments. The experimental results show that the measurements of drainage capillary pressure, and resistivity index and spontaneous imbibition on small core samples, having similar scales as micro-CT imaging can be made accurately in the laboratory. The measurement of relative permeability remains challenging. This thesis concludes that commonly used homogeneous rock types (Berea and Bentheim sandstones and Mt. Gambier carbonate) can be considered to be sufficiently homogeneous from the pore to core scale based on the two-phase flow properties examined in this study. Hence, laboratory data taken from these rocks using conventional core plugs can be used to calibrate micro-CT based network models for multiphase flow properties.
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Bingham, Robert Matthew. "Self-consistent two-dimensional hybrid code simulations of 'small scale' comets." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360551.
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Lynch, Molly Ellen. "Self-handicapping and overachievement : two strategies to cope with self-doubt." Connect to resource, 1998. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1232802565.
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Almutairi, Reham. "Performance Evaluations of Two Join Methods: Join Core and Join Indices." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2226.
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Traditional join algorithms can be categorized into three groups: hash-based join, sort-merge join, and nested-loop join. Many variations of these algorithms have been proposed during the last few decades to improve the performance. In this paper, we have compared between two of the most efficient join methods: Join indices and Join Core. Join indices generate index tables that contain tuples identifiers for matched tuples. It scans each input relation only once, the join index once, and scans temporary files twice. On the other hand, Join Core is a data structure created to facilitate complex join queries promptly. With the Join Core, join queries can be handled quickly without performing costly join operations. Also, no intermediate results need to be retrieved during the runtime. Consequently, join queries can be answered rapidly. We implement the multi-way Jive-join version of the Join indices, using Java and TPC-H benchmark datasets. Our experimental result shows that even multi-way Jive-join method has better memory utilization, it takes a long time to process queries since it requires generating output files and temporary files before generating the final results. However, our results show that processing queries with Multi-way Jive-join is faster than using MySQL.
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Cui, Han. "Modeling, Implementation, and Simulation of Two-Winding Plate Inductor." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78301.
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Design of magnetic component is a key factor in achieving high frequency, high power-density converters. Planar magnetics are widely used in bias power supplies for the benefits of low profile and their compatibility with printed-circuit boards (PCB). The coupled inductors with winding layers sandwiched between two core plates are studied in this dissertation in order to model the self-inductance, winding loss, and core loss.
The most challenging task for the plate-core inductor is to model the magnetic field with finite core dimensions, very non-uniform flux pattern, and large fringing flux. The winding is placed near the edge of the core to maximize the energy within the limited footprint and the amount of energy stored outside the core volume is not negligible. The proportional-reluctance, equal-flux (PREF) model is developed to build the contours with equal amount of flux by governing the reluctance of the flux path. The shapes of the flux lines are modeled by different functions that guided by the finite-element simulation (FES). The field from the flux lines enables calculation of inductance, winding loss, and core loss, etc.
The inductance matrix including self-inductance and mutual inductance of a coupled inductor is important for circuit simulation and evaluation. The derivation of the inductance matrix of inductors with plate-core structure is described in Chapter 2. Two conditions are defined as common-mode (CM) field and differential-mode (DM) field in order to compute the matrix parameters. The proportional-reluctance, equal-flux (PREF) model introduced is employed to find the CM field distribution, and the DM field distribution is found from functions analogous to that of a solenoid's field. The inductance calculated are verified by flex-circuit prototypes with various dimensions, and the application of the inductance model is presented at the last with normalized parameters to cover structures within a wide-range.
In circuit where coupled inductors are used instead of transformers, the phase shift between the primary and secondary side is not always 180 degrees. Therefore, it is important to model the winding loss for a coupled inductor accurately. The winding loss can be calculated from the resistance matrix, which is independent of excitations but only relates to the frequency and geometry. The methodology to derive the resistance matrix from winding losses of coupled inductors is discussed. Winding loss model with 2D magnetic field is improved by including the additional eddy current loss for better accuracy for the plate-core structures. The resistance matrix calculated from the model is verified by both measurement results and finite-element simulation (FES) of coupled-inductor prototypes.
Accurate core loss model is required for designing magnetic components in power converters. Most existing core loss models are based on frequency domain calculation and they cannot be implemented in SPICE simulations. The core loss model in the time domain is discussed in Chapter 5 for arbitrary current excitations. An effective ac flux density is derived to simplify the core loss calculation with non-uniform field distribution. A sub-circuit for core loss simulation is established in LTSPICE that is capable of being integrated to the power stage simulation. Transient behavior and accurate simulation results from the LTSPICE matches very well with the FES results.
An equivalent circuit for coupled windings is developed for inductors with significant fringing effect. The equivalent circuit is derived from a physical model that captures the flux paths by having a leakage inductor and two mutual inductors on the primary and secondary side. A mutual resistor is added to each side in parallel with one mutual inductor to model the winding loss with open circuit and phase-shift impact. Two time-varying resistors are employed to represent the core loss in the time-domain. The equivalent circuit is verified by both finite-element simulation (FES) and prototypes fabricated with flexible circuit.Ph. D.
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Eriksson, Jonas. "Aspects of List-of-Two Decoding." Doctoral thesis, Linköping : Department of Electrical Engineering, Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6919.
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Thompson, Thomas L. "Velocity measurements near the blade tip and in the tip vortex core of a hovering model rotor." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/13003.
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Gudmundson, Stephan. "TRANSPARENT SATELLITE BANDWIDTH ACCELERATION." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606743.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaWhile the transition to IP internetworking in space-based applications has a tremendous upside, there are significant challenges of communications efficiency and compatibility to overcome. This paper describes a very high efficiency, low-risk, incremental architecture for migrating to IP internetworking based on the use of proxies. In addition to impressive gains in communications bandwidth, the architecture provides encapsulation of potentially volatile decisions such as particular vendors and network technologies. The specific benchmarking architecture is a NetAcquire Corporation COTS telemetry system that includes built-in TCP-Tranquility (also known as SCPS-TP) and Reed-Solomon Forward Error Correction capabilities as well as a specialized proxy-capable network stack. Depending on network conditions, we will show that the effective bandwidth for satellite transmissions can be increased as much as a factor of one hundred with no external changes to existing internetworking equipment.
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Saito, Yahachi, Yuhki Tsujimoto, Akira Koshio, and Fumio Kokai. "Field emission patterns from multiwall carbon nanotubes with a cone-shaped tip." American Institute of Physics, 2007. http://hdl.handle.net/2237/8776.
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Guldal, Tale Margrethe. "Three children, two languages : the role of code selection in organizing conversation." Doctoral thesis, Norwegian University of Science and Technology, Norwegian University of Science and Technology, 1997. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1743.
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Williams, Jimmy. "Two-loop renormalization of the quark propagator in the light-cone gauge." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0002/NQ43279.pdf.
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Edblom, Christin. "Numerical Studies of Vortex Core States in Type II Superconductors." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-55159.
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In this thesis, we study an isolated vortex in an s-wave superconductor by solving the Bogoliubov-de Gennes equations self-consistently on a disc. We calculate the order parameter and supercurrent profiles, as well as the distribution of quasiparticle states. In contrast to quasi-classical treatments, the ratio Δ∞/EF between the order parameter and the Fermi energy is not assumed negligible. We study a regime where this ratio is on the order of 10-1, relevant to high-temperature superconductors. In this regime, we find a Friedel-like oscillation in the order parameter profile at low temperatures. This oscillation is attributed to an increased level spacing of the quasiparticle states, causing a decrease of the number of states present inside the superconducting energy gap. The results are in good agreement with previously published works. In future studies, the method used in this thesis will be generalized to d-wave superconductors.I detta examensarbete studeras en ensam virvel i en s-vågssupraledare genom att självkonsistent lösa Bogoliubov och de Gennes' ekvationer på en cylinderskiva. Vi beräknar ordningsparameter- och superströmsprofiler, samt fördelningen av kvasipartikeltillstånd. Till skillnad från i kvasiklassiska metoder så antas inte kvoten Δ∞/EF mellan ordningsparametern och Fermi-energin vara negligerbar. Vi studerar en regim där denna kvot är av storleksordningen 10-1, vilket är fallet i högtemperatur-supraledare. Vid låga temperaturer finner vi i denna regim en Friedelliknande oscillation i ordningsparameterprofilen. Denna oscillations förklaras genom att separationen mellan kvasipartikeltillstånd ökar, vilket får som effekt att färre tillstånd ryms innanför det supraledande energigapet. Våra resultat överensstämmer väl med tidigare publicerade artikler. I framtida studier kommer metoden vi använder i detta examensarbete att generaliseras till d-vågssupraledare.
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zhang, shan. "Study of building code and calculation of energy consumption for same building situated in two climates, Chengdu and Stockholm." Thesis, KTH, Uthålliga byggnadssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169515.
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This report is aim to compared building standard of Chengdu city and Stockholm, as well as find out the suitable energy-saving scenario for two places. To simulate the total energy consumption of logistics building, energy software named design builder will be introduce to calculate. Some of other analysis will be implemented at the same time, including economic analysis, environment analysis and thermal comfort analysis.
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Greene, Jonathan Andrew. "Photoinduced, refractive-index gratings in germanium-doped two-mode, elliptical-core optical fibers." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08222009-040313/.
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Scott, Roger E. "A case study in object-oriented development : code reuse for two computer games /." Master's thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12162009-020034/.
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Marr, Matthew David. "Better must come exiting homelessness in two global cities, Los Angeles and Tokyo /." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1428859811&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Cho, Donald L. (Donald Lee). "Effect of vortex core stagnation pressure on tip clearance flow blockage in turbomachines." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/47391.
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Tien, Ching-Yi. "Code-switching in two freshman English classrooms in a university in Southern Taiwan." Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/30881.
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This study examines the use of Mandarin, Taiwanese, and English in two Freshman English classrooms in a university in southern Taiwan. With a varied language history, several languages are spoken in Taiwan. Although there are monolingual speakers of either Taiwanese or Mandarin, the majority of people in Taiwan are bilingual or trilingual. Therefore, code-switching often occurs in people's daily conversation. Just as languages are used in speaker's daily communication, so it is in the classroom context. The three aims of this study are firstly to explore the nature of classroom talk, focusing specially on how teachers and learners use more than one language to talk around monolingual textbooks in order to accomplish lessons, and secondly to investigate the attitudes of teachers and learners towards the use of more than one language in the classroom (code-switching in the classroom). Thirdly, the study considers the implications of the way language is used in the classroom and the teachers' and learners' attitudes to code-switching. A mixed research method, a combination of quantitative and qualitative perspectives, was utilized in the study, which is based on three major data sources: interviews with two teachers and two groups of students, questionnaires answered by the students, and in-class observations, together with field notes and audio recordings. The study has found that code-switching was used both by the teachers and students in the classrooms. The teachers switched codes, mainly between English and Mandarin, to unlock the meanings from the monolingual English textbooks, for classroom management and to form and maintain solidarity in the classrooms. The students were allowed to use Mandarin and Taiwanese in classrooms. Attitudes towards the usefulness of code-switching in the classrooms were found to be positive amongst the participants.
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Wang, Zhi G. "Simultaneous measurement of strain and temperature using two-mode elliptical core optical fiber." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/41527.
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A single piece of optical fiber can be utilized to sense both strain and temperature simultaneously. To develop such a sensor, we sandwich a section of two-mode elliptical core (e-core) fiber between two partially reflecting mirrors. This configuration can be considered as an intrinsic Fabry-Perot interferometer, in which the two-mode, e-core fiber serves as the resonant cavity. Two different types of phase modulation can be extracted under perturbations of strain and temperature on the fiber. These phase changes are due to the two-mode interference and intrinsic Fabry-Perot interference, respectively. The relationship between the phase information and the two physical measurands, i.e. strain and temperature, can be established using two coupled equations, in which the strain and temperature are considered as two unknowns. By solving these two coupled equations, we can simultaneously determine the strain and temperature. The waveguide theory and the Cross sensitivity analysis of this sensor are presented. The descriptions of four independent experiments that have been used to determine the coefficients of the two coupled equations are given. The resolutions of the strain and temperature measurements have been obtained to be 31 μm/m and 4.5 °C, respectively.Master of Science
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Alhazmi, Daniah Mansour. "Comparative study of dosimetry in two cone beam CT devices: I-CAT FLX and CS9000." Thesis, University of Iowa, 2018. https://ir.uiowa.edu/etd/3239.
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Introduction: Increasing the imaging demand in the dental field has lead to a dramatic increase in the number of CBCT machines in the U.S. market with a variety of new models and features, as well as different radiation exposures. These differences in exposure among the different CBCT machines and the potential for radiation accumulation over a life time are major concerns for aiming for a reduction in patients’ radiation exposure. Most of the studies have aimed to measure the radiation dose in different CBCT units with different field of views. Up to date, few studies have aimed to measure the radiation dose in different CBCT devices with similar fields of view. The aim of the study was to compare the dosimetry levels with relatively small FOV in different scan protocols in two CBCT units.
Materials and methods: A 16-cm diameter PMMA phantom with 10-cm pencil ionization chamber were used to measure the radiation exposure from two CBCT devices: i-CAT FLX and CS9000. A smallest FOV in both CBCT (8 x 8 cm in the i-CAT FLX and 5 x 3.7 cm in the CS9000) was selected at different scan protocols. The scan settings included in the i-CAT FLX HD (120 kVp; 5 mA; 7.4 sec; 0.125, 0.250, 0.200 mm voxel sizes; 360° rotation) Quick HD (120 kVp; 5 mA; 4.1 sec; 0.200, 0.250 mm voxel sizes; 180° rotation), Quick+ (90 kVp; 3 mA; 2 sec; 0.300, 0.400 mm voxel sizes; 180° rotation) , Quick (120 kVp; 5 mA; 2 sec; 0.300, 0.400 mm voxel sizes; 180° rotation), and standard scans (120 kVp; 5 mA; 3.7 sec; 0.300, 0.400 mm voxel sizes; 360° rotation). In the CS9000 scan settings included voxel sizes (CS9000: 0.076 mm, 0.100 mm, and 0.200 mm), 80 kVp, 10 mA, 10.8 sec, and 360° rotation. The phantom was exposed three times at the same position to calculate the average measurement of dose by the ionization chamber. All the radiation exposure doses were read by one examiner.
Results: The radiation exposure of the phantom slots in different resolutions and scan protocols in the both CBCT units ranged from 4.31 to 60.73 mR. There were statistically significant differences in radiation value between i-CAT FLX and CS9000 due to voxel size (P < 0.001). Each voxel size was significantly different from the other in both scanners, except between CS9000 0.076 and HD 0.125; CS9000 0.200 and HD 0.125; and CS9000 0.100 and HD 0.200. Also, there were no statistically significant differences between the voxel size within the same scan protocols in the i-CAT FLX, especially the Quick HD, Quick+, Quick, and Standard scans.
Conclusion: The selection of x-ray parameters (mainly scan time), voxel size, and rotation angle have a significant radiation expsoure reduction in both the i-CAT FLX and CS9000 units and hence should be appropriately selected to minimize the radiation dose.
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Shin, Sangmook. "Reynolds-Averaged Navier-Stokes Computation of Tip Clearance Flow in a Compressor Cascade Using an Unstructured Grid." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28947.
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A three-dimensional unstructured incompressible RANS code has been developed using artificial compressibility and Spalart-Allmaras eddy viscosity model. A node-based finite volume method is used in which all flow variables are defined at the vertices of tetrahedrons in an unstructured grid. The inviscid fluxes are computed by using the Roe's flux difference splitting method, and higher order accuracy is attained by data reconstruction based on Taylor series expansion. Gauss theorem is used to formulate necessary gradients. For time integration, an implicit scheme based on linearized Euler backward method is used.
A tetrahedral unstructured grid generation code has been also developed and applied to the tip clearance flow in a highly staggered cascade. Surface grids are first generated in the flow passage and blade tip by using several triangulation methods including Delaunay triangulation, advancing front method and advancing layer method. Then the whole computational domain including tip gap region is filled with prisms using the surface grids. Each prism is divided into three tetrahedrons. To accomplish this division in a consistent manner, connectivity pattern is assigned to each triangle in the surface grids. A new algorithm is devised to assign the connectivity pattern without reference to the particular method of triangulation. This technique offers great flexibility in surface grid generation.
The code has been validated by comparisons with available computational and experimental results for several test cases: invisicd flow around NACA section, laminar and turbulent flow over a flat plate, turbulent flow through double-circular arc cascade and laminar flow through a square duct with 90° bend. For the laminar flat plate case, the velocity profile and skin friction coefficient are in excellent agreement with Blasius solution. For the turbulent flat plate case, velocity profiles are in full agreement with the law of the wall up to Reynolds number of 1.0E8, however, the skin friction coefficient is under-predicted by about 10% in comparison with empirical formula. Blade loading for the two-dimensional circular arc cascade is also compared with experiments. The results obtained with the experimental inflow angle (51.5° ) show some discrepancies at the trailing edge and severely under-predict the suction peak at the leading edge. These discrepancies are completely remedied if the inflow angle is increased to 53.5° . The code is also capable of predicting the secondary flow in the square duct with 90° bend, and the velocity profiles are in good agreement with measurements and published Navier-Stokes computations.
Finally the code is applied to a linear cascade that has GE rotor B section with tip clearance and a high stagger angle of 56.9° . The overall structure of the tip clearance flow is well predicted. Loss of loading due to tip leakage flow and reloading due to tip leakage vortex are presented. On the end wall, separation line of the tip leakage vortex and reattachment line of passage vortex are identified. The location of the tip leakage vortex in the passage agrees very well with oil flow visualization. Separation bubble on the blade tip is also predicted. Mean streamwise velocity contours and cross sectional velocity vectors are compared with experimental results in the near wake, and good agreements are observed. It is concluded that Spalart-Allmaras turbulence model is adequate for this type of flow field except at locations where the tip leakage vortex of one blade interacts with the wake of a following blade. This situation may prevail for blades with longer span and/or in the far wake. Prediction of such an interaction presents a challenge to RANS computations.
The effects of blade span on the flow structure have been also investigated. Two cascades with blades of aspect ratios of 0.5 and 1.0 are considered. By comparing pressure distributions on the blade, it is shown that the aspect ratio has strong effects on loading distribution on the blade although the tip gap height is very small (0.016 chord). Grid convergence study has been carried out with three different grids for pressure distributions and limiting streamlines on the end wall.Ph. D.
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Matsumura, T., A. Kimura, H. Shimizu, Y. Yokomizu, and M. Goto. "Fundamental performance of flux-lock type fault current limiter with two air-core coils." IEEE, 2003. http://hdl.handle.net/2237/6786.
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Johnson, Matthew J. "The function of ExsY and CotY, two structural proteins of the Bacillus cereus exosporium." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414644.
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Arndt, Alex Michael. "Performance-Based Liquefaction Triggering Analyses with Two Liquefaction Models Using the Cone Penetration Test." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6945.
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This study examines the use of performance-based engineering in earthquake liquefaction hazard analysis with Cone Penetration Test data (CPT). This work builds upon previous research involving performance-based liquefaction analysis with the Standard Penetration Test (SPT). Two new performance-based liquefaction triggering models are presented herein. The two models used in this liquefaction analysis are modified from the case-history based probabilistic models proposed by Ku et al. (2012) and Boulanger and Idriss (2014). Using these models, a comparison is made between the performance-based method and the conventional pseudo-probabilistic method. This comparison uses the 2014 USGS probabilistic seismic hazard models for both methods. The comparison reveals that, although in most cases both methods predict similar liquefaction hazard using a factor of safety against liquefaction, by comparing the probability of liquefaction, the performance-based method on average will predict a smaller liquefaction hazard.
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Cai, Yong. "Research on quality traceability system of traditional Chinese medicine based on two-dimensional code." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3690824.
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Yuan, Kai, Xiaodong Zhuang, Haiyan Fu, Gunther Brunklaus, Michael Forster, Yiwang Chen, Xinliang Feng, and Ullrich Scherf. "Two-Dimensional Core-Shelled Porous Hybrids as Highly Efficient Catalysts for Oxygen Reduction Reaction." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235469.
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Vidotti, Silvana Aparecida Borsetti Gregorio. "PROBLEMA DE CORTE BIDIMENSIONAL GUILHOTINADO NÂO-ESTAGIADO E IRRESTRITO." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-20082018-143855/.
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O objetivo geral deste estudo é o de trabalhar o problema de corte bidimensional guilhotinado irrestrito e no-estagiado. Para tanto, foram revistas regras e heurísticas a serem utilizadas e foi sugerida uma combinação da regra de simetria com a heurística de geraçgo dos pontos de cortes possíveis. Uma abordagem em grafo-E/OU, com a utilizaçgo de uma estratégia híbrida, que combina as técnicas \"Hill-Climbing\" e \"Depth-First\" para a busca em grafo, foi utilizada para a resolução do problema. Finalmente, foram comparados os resultados obtidos com resultados apresentados na literatura.The general purpose of this study is to deal with the non-staged unconstrained guilhotined cutting problem. For this, rules and heuristics in use are reviewed and a combination between simmetry rule and possible cutting points generation heuristics in suggested. An AND/OR-graph approach, with used a hibrid strategy that combines Hill-Climbing and Depth-First techniques, in order to serach the graph, was used to solve this problem. Finally, results from this study and results presented in the literature are compared.
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Oliveira, Eliane Vendramini de. "Otimização do problema de corte bidimensional não guilhotinado usando meta-heurísticas especializadas." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154510.
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O Problema de Corte Bidimensional não guilhotinado tem sua aplicação prática quando comparado a problemas de indústrias que trabalham com aço, madeira, vidro, entre outros materiais, os quais necessitam de um padrão de corte que lhes proporcione maior lucro entre as peças cortadas, usando-se como técnica de corte o laser, e não a guilhotina, por isso existem diversas propostas para a resolução desse problema. Em particular, as propostas de solução utilizando-se meta-heurísticas foram o foco desta pesquisa. Vários trabalhos relevantes nessa área foram analisados, servindo de base para que esta tese trouxesse contribuições para a resolução do problema. A pesquisa sobre o problema permitiu que se apresentasse uma nova forma de representação da proposta de solução para o problema de corte bidimensional não guilhotinado. Outro resultado importante que se apresenta neste trabalho foi o desenvolvimento de duas meta-heurísticas especializadas na resolução do problema de corte bidimensional não guilhotinado. A primeira delas é o algoritmo genético de chaves aleatórias viciadas, e a segunda meta-heurística implementada foi RVNS. Foram realizados vários testes, utilizando-se instâncias conhecidas na literatura especializada, e os resultados encontrados pelas metaheurísticas algoritmo genético e RVNS propostas pela autora foram de boa qualidade, principalmente se comparados com os resultados já conhecidos na literatura. Os resultados obtidos com o algoritmo genético especializado, em muitos casos, foram iguais aos encontrados na literatura, e em dois casos de testes apresentaram-se superiores, contribuindo novamente para a área especializada no problema. Outro comparativo de resultados realizados pela autora está relacionado aos resultados obtidos pelas meta-heurísticas especialistas, propostas nesta tese, aos resultados encontrados utilizando-se o software AMPL para modelagem matemática em conjunto com o solver CPLEX. Nesse caso, novamente as meta-heurísticas algoritmo genético e RVNS apresentaram resultados iguais ou muito próximos do ótimo encontrado pelo modelo matemático. Os algoritmos desenvolvidos pela autora, além de resolverem o problema de corte bidimensional não guilhotinado, apresentaram bons resultados, visto que promoveram melhorias em relação ao que já existe na literatura. Os algoritmos foram escritos na linguagem de programação Fortran. Foram utilizados casos de teste de pequeno, médio e grande número de peças. Concluiu-se que o problema de corte bidimensional não guilhotinado é complexo e apresenta diversas variantes, sendo que as meta-heurísticas implementadas, neste trabalho, atendem a essa demanda com eficiência. Evidências empíricas mostram que esses algoritmos podem ser apropriados para solucionar instâncias associadas a situações reais.
The two-dimensional non-guillotine cutting problem has its practical application when compared to problems in industries that work with steel, wood, glass, among other materials, which require a cut pattern that provides more profit among the cut pieces, using laser as a cut technique, not the guillotine. Thus, there are several potential answers for this question. In particular, the potential solutions using metaheuristics were the focus of this research. Several relevant papers in this area were analyzed, forming a base so that this dissertation can bring solutions for the problem. The research about this issue allowed us to present a new form of representation of the proposal of solution for the two-dimensional non-guillotine problem. Another important result presented in this paper is the development of two metaheuristics specialized in the resolution of the two-dimensional non-guillotine problem. The first is the biased random-key genetic algorithm. The second metaheuristics was the RVNS. Several tests were performed, using methods well-known in the specialized literature, and the results found by the metaheuristics genetic algorithm and the RVNS suggested by the author were of good quality, mainly if compared to the results already known in the literature. The results obtained by the specialized genetic algorithm, in many cases, were equal to the ones found in the literature, and, in two tests, they were superior, once more contributing to the specialized field of the problem. Another comparison between the results performed by the author is related to the outcomes obtained by the specialized metaheuristics, suggested in this dissertation, and the ones found using the AMPL software to the mathematical modeling together with the CPLEX solver. In this case, once more, the genetic algorithm and RVNS metaheuristics presented resulted identical or very similar to the optimum one found by the mathematical model. The algorithms developed by the author not just solved the two-dimensional non-guillotine cutting problem, but present good results, given that they promoted improvements, comparing to what already exists in the literature. The algorithms were written in the Fortran programming language. Small, medium and big number of pieces’ case-tests were performed. The conclusion was that the two-dimensional non-guillotine cutting problem is complex and presents several variants. However, the metaheuristics implemented by this research efficiently meet this demand. Empirical evidences show that these algorithms can be used to solve issues associated with real situations.
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Romitto, Graciana Corrêa. "Perfil bidimensional de proteínas do plasma seminal e características ligadas ao desempenho reprodutivo de touros de corte." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/10/10131/tde-09062004-085131/.
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Estudou-se o perfil de proteínas de plasma seminal de touros das raças Nelore (Bos taurus primigerus indicus) e Simental (Bos taurus primigerus taurus), criados a campo, em regime de acasalamento múltiplo e manejo extensivo, na região de Dourados/MS, a fim de analisar a relação entre estas proteínas e características ligadas ao desempenho reprodutivo de touros. Coletaram-se amostras de sêmen no período de inverno (Julho/2001) e verão (Fevereiro/2002), realizando-se inicialmente o exame andrológico nos animais, e em seguida a análise padrão do sêmen. O plasma seminal foi, então, submetido à dosagem de proteínas totais, à dosagem de substâncias reativas ao ácido tiobarbitúrico (TBARS), para avaliação da ocorrência de lipoperoxidação, e à eletroforese bidimensional de proteínas. Para análise do perfil proteico de plasma seminal da cada raça, foram utilizados os seguintes parâmetros: comparação entre os períodos de inverno e verão; comparação de grupos de amostras separados de acordo com a quantificação de características ligadas ao desempenho reprodutivo (morfologia espermática, dosagem de proteína total e dosagem de TBARS); e comparação de grupos de amostras separados de acordo com classificações para avaliação da capacidade reprodutiva, previamente descritas na literatura (Breeding Soundness Evaluations BSEs). Os touros da raça Simental demonstraram menor adaptação às condições ambientais tropicais, com valores mais altos de defeitos espermáticos maiores, proteína total e dosagem de TBARS no período de verão. Observou-se grande variabilidade no perfil proteico entre as raças Nelore e Simental e, dentro de cada raça, encontrou-se expressiva variação individual. O perfil de proteínas de plasma seminal de touros Nelore apresentou 155 spots, entre os quais 04 se destacaram como possíveis marcadores de características ligadas ao desempenho reprodutivo. Já na raça Simental foram identificados 248 spots, com destaque para 04 spots, que demonstraram maior potencial como marcadores de características de interesse para a reprodução. Os resultados mostram que o perfil de proteínas de plasma seminal está relacionado ao desempenho reprodutivo de touros, fazendo-se necessários maiores estudos sobre as proteínas que se destacaram como marcadores, a fim de identificar as funções que elas exercem no trato reprodutivo e nos eventos ligados à fertilização.Seminal plasma proteins profiles from Nelore (Bos taurus primigerus indicus) and Simmental (Bos taurus primigerus taurus) bulls, used for multiple-sire breeding under range conditions, at Dourados/MS region, were studied aiming to analyze the relation between these proteins and traits linked to bulls reproductive performance. Semen samples were collected in the winter (July/2001) and summer (February/2002). Initially, an andrological examination was performed, followed by standard semen analysis. Seminal plasma was subjected to total protein quantification, thiobarbituric acid reactive substances quantification (TBARS, to evaluate lipid peroxidation), and two-dimensional protein electrophoresis. To analyze seminal plasma protein profile of each breed, the following parameters were used: comparison between winter and summer, comparison among groups of samples divided by quantification of traits linked to reproductive performance (sperm morphology, total protein quantification, TBARS quantification) and comparison among groups of samples divided by breeding soundness evaluations (BSEs), previously reported in literature. Simmental bulls showed lower adaptability to tropical environment conditions, with higher values of major sperm defects, total protein and TBARS in the summer. A great variability was observed in the protein profile between Nelore and Simmental breeds, and, for each breed it was found great individual variability too. Nelore seminal plasma protein profile presented 155 spots, 04 of which were considered potential markers for traits linked to reproductive performance. For Simmental breed, 248 spots were identified, with special interest for 04 spots, which showed higher potential as markers to reproductive characteristics. Results show that seminal plasma protein profile is related to bulls reproductive performance. Further studies about those proteins which are potential markers are needed, to determine their function at bulls reproductive system and in the events related to fertilization.
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Browning, John Adam. "Cone tip apex angle effects on cone penetration testing." 2005. http://www.lib.ncsu.edu/theses/available/etd-04112006-192136/unrestricted/etd.pdf.
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Chen, Yi-Ting, and 陳怡婷. "Two-Layer Network Code for Multicast." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/86563826695468656800.
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碩士國立臺灣師範大學
資訊工程研究所
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Without proper coding to counter frequent transmission loss over time-varying fading channel, opportunistic multicast in one-hop wireless forward-link still suffers the famous Coupon Collection Problem which incurs a significant amount of delay for some users to receive the last required packet. This issue can be alleviated by viewing the fading channel as an erasure channel and using erasure code over the channel. However, it is unclear how best a coding approach could achieve if there is perfect feedback on channel state. The thesis presents a two-layer network code for use in the multicast scenario and studies its performance. This code is essentially a concatenation of Reed-Solomon code and Random Linear code. The proposed random linear code utilizes channel state and the history of packet reception by each group user to generate coded packets for transmission. Here we use the pair of information on channel state and reception history to create a candidate set. One way is to randomly choose those components in the candidate set. The other is to randomly choose those components with some designed weight. In our simulation, there are three codes used for data transmission: Reed-Solomon Code, Random Linear Code, and proposed two-layer network code. Simulations show that two-layer network code with shorter linear combination degree has better performance than the other two codes. Meanwhile, the decoding delay is reduced. Furthermore, the multicast network with larger group size is more suitable for 2-layer network code.