Дисертації з теми "GAS5"
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Manganelli, Michele. "Molecular characterization of GAS5, miR-126-3p and TERRA in human hepatocellular carcinoma." Doctoral thesis, Università degli studi di Brescia, 2021. http://hdl.handle.net/11379/544094.
Повний текст джерелаRolli, E. "GAS1, GAS2, GAS3 and GAS4 : four developmentally regulated genes with specialized roles at different stages of the yeast life cycle." Doctoral thesis, Università degli Studi di Milano, 2009. http://hdl.handle.net/2434/69558.
Повний текст джерелаPimenta, Luciano Cunha de Araujo. "Navegação de robôs móveis baseada na equação de laplace: uma nova abordagem utilizando elementos finitos." Universidade Federal de Minas Gerais, 2005. http://hdl.handle.net/1843/GASP-6AHJDQ.
Повний текст джерелаEste trabalho aborda o problema de navegação de robôs móveis. Mais especificamente, é proposta uma nova abordagem, no contexto de robótica, para a solução da equação Laplace visando a construção de funções de navegação. Esta nova abordagem consiste na aplicação do Método de Elementos Finitos, o que permite o tratamento de obstáculos e robôs de formatos complexos. O trabalho ainda propõe regras para a definição de condições de contorno para a solução da equação de Laplace, as quais tornam a metodologia proposta completa, isto é, caso exista um caminho possível, o robô sempre atinge o alvo num tempo finito, independentemente da posição e orientação iniciais. Uma nova condição de contorno, dentro do contexto de robótica, chamada Condição de Contorno Periódica, também é proposta neste trabalho, permitindo um tratamento fechado da orientação do robô. O tratamento da orientação do robô passa também pela construção de espaços de configurações em R3, utilizados quando a orientação de robôs navegando no plano é considerada. Esta dissertação propõe um novo algoritmo para uma construção aproximada desses espaços. Os resultados do trabalho são validados numa plataforma constituída de robôs holonômicos reais
Salis, Turibio Tanus. "Aplicações de visão computacional na indústria siderúrgica: problemas, soluções e estudos de caso." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/GASP-7LXK22.
Повний текст джерелаEste trabalho busca discutir a utilização de visão computacional nos processos siderúrgicos, desde a extração da matéria-prima nas minas, passando pelas etapas de redução, aciaria, laminação até a inspeção dos produtos finais. O trabalho apresenta uma extensa revisão bibliográfica na qual se descreve os principais problemas encontrados pelos pesquisadores em ambientes siderúrgicos e as respectivas soluções adotadas para contorná-los. O trabalho comenta ainda o desenvolvimento de quatro protótipos de aplicações paraos processos siderúrgicos da usina de Ouro Branco, além de descrever o levantamento de outras soluções que podem contribuir para a melhoria dos processos.
Pimenta, Luciano Cunha de Araujo. "Techniques for Controlling Swarms of Robots." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/GASP-7Y5F4W.
Повний текст джерелаEsta tese aborda o problema de controle de grandes grupos de robôs, referidos como enxames. São propostas soluções escaláveis as quais não necessitam da identificação única dos robôs. Todos os robôs executam o mesmo código e o sucesso na execução de uma tarefa não depende de membros específicos do grupo. Robustez à adição e remoção dinâmica de agentes também é uma vantagem das abordagens propostas. Na primeira metodologia, o enxame é modelado como um fluido imerso numa região onde um campo de forças externas livre de mínimos locais é definido. Neste caso, utiliza-se o método de Hidrodinâmica de Partículas Suavizadas (HPS) para modelar o fluido robótico'', mais especificamente, para modelar as interações entre robôs do grupo. O Método de Elementos Finitos (MEF) também é utilizado neste trabalho para calcular os campos vetoriais que determinam as forças externas. Esta abordagem é instanciada num problema de geração de padrões e também num problema de cobertura de ambientes. Na segunda metodologia, um problema de cobertura ótima de ambientes utilizando robôs equipados com sensores é tratado por meio de ferramentas provenientes da teoria de Otimização Locacional. São apresentadas três extensões importantes de resultados já conhecidos na literatura: (i) sensores com diferentes campos de visão, (ii) robôs com formato circular e (iii) ambientes poligonais não-convexos. Ambas metodologias são verificadas em simulações. A primeira metodologia é também implementada e testada em robôs reais.
Fonseca, Alexandre Ramos. "Composição de mapas planares e planejamento de rotas aplicados à navegação de robôs móveis e linhas de transmissão." Universidade Federal de Minas Gerais, 2006. http://hdl.handle.net/1843/GASP-6NQP2X.
Повний текст джерелаEncontrar o caminho de menor custo entre dois pontos em um mapa temático é um problema comum. Entretanto, esse planejamento pode se tornar complexo levando-se em conta o elevado número de variáveis e restrições do problema. Essa dissertação propõe o uso de técnicas de sobreposição de mapas e de otimização para encontrar uma aproximação da rota ótima, considerando todas as informações topológicas e restrições necessárias. Além disso, uma técnica de pós-processamento para refinar a solução é apresentada. O problema pode ser modelado, sem perda de generalidade, por um conjunto de mapas temáticos aos quais funções de custo são associadas a cada região, com o objetivo de estimar sua dificuldade de transposição. A técnica de sobreposição de mapas é usada para combinar as informações dos mapas temáticos. Essa técnica produz um mapa combinado contendo as informações de cada mapa e o mapa resultante é então decomposto em regiões convexas utilizando uma triangulação. Após a discretização, os vértices dos triângulos correspondem aos nós do grafo. O grafo é construído levando em conta o custo de transposição entre os nós e a distância topológica entre eles. Esta distância é definida como o número mínimo de arestas entre os nós. Pode-se assegurar a melhor solução somente quando o grafo completo é considerado. Entretanto, o custo computacional para este caso é proibitivo. Uma técnica de pós-processamento é proposta para encontrar boas soluções sem considerar um número elevado de conexões. O algoritmo de Dijkstra é utilizado para calcular o caminho inicial. Como aplicação, dois problemas de planejamento de rotas são considerados: navegação de robôs em ambientes externos e o projeto de rotas de linhas de transmissão. Em ambos os casos, exemplos práticos foram usados para a validação do método desenvolvido.
Santos, Michelle Mendes. "Desenvolvimento de um sistema de localização e reconstrução de trajetórias para um veículo terrestre." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/GASP-7Y5EWQ.
Повний текст джерелаA tarefa de localização de um robô móvel constitui-se como uma das etapas fundamentais para se atingir o objetivo de locomoção autônoma do mesmo, tendo em vista que um veículo deve conhecer sua posição geográfica, em relação a um determinado referencial, para conseguir se desviar de obstáculos conhecidos e alcançar lugares desejados. O cumprimento desta tarefa demanda a utilização de informações ruidosas provenientes de diversos tipos de sensores. Neste trabalho tem-se como objetivo o estudo de técnicas de fusão sensorial aplicadas ao desenvolvimento de um sistema de localização para um automóvel de passeio, o qual será futuramente usado como plataforma robótica móvel. O sistema desenvolvido provê não apenas informações acerca da posição geográfica do veículo, mas também fornece estimativas de velocidade e orientação ao longo do trajeto, graças à utilização de sensores de posição, velocidade e aceleração, adequadamente instalados e calibrados, cujas medições são processadas por algoritmos de estimação baseados no Filtro de Kalman. Como exemplo de aplicação do sistema de localização proposto neste trabalho, foi desenvolvido um guia eletrônico embarcado que, em conjunto com mapas fornecidos previamente, pode apresentar informações ao motorista que trafega com o veículo em um dado instante.
Lima, Danilo Alves de. "Navegação segura de um carro autônomo utilizando campos vetoriais e o método da janela dinâmica." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/GASP-8C4QBE.
Повний текст джерелаA navegação segura é uma tarefa fundamental para os veículos autônomos, os quais necessitam de uma interação completa com o meio em que estão inseridos. Saber se localizar no mundo, planejar seu movimento, perceber o ambiente e desviar de possíveis obstáculos, são apenas algumas das etapas que devem ser realizadas pelo veículo. Este trabalho aborda o problema de navegação segura de um carro autônomo. Para tanto, é utilizado um planejamento de movimento por meio de campos vetoriais de velocidade aliado ao Método da Janela Dinâmica para o desvio de obstáculos não modelados. Basicamente, o campo vetorial é associado a um controlador cujas saídas são validadas pelo Método da Janela Dinâmica e aplicadas como entradas de controle do carro. Para auxiliar na navegação, técnicas de localização por fusão sensorial e percepção do ambiente por uma grade ocupação local foram incorporadas à solução. A validação da metodologia apresentada foi realizada em um ambiente de simulação, onde sensores a laser e visuais foram avaliados, e posteriormente implementada no CADU (Carro autônomo desenvolvido na Universidade Federal de Minas Gerias) que utiliza visão estéreo para a percepção dos obstáculos. Os resultados, para ambos os casos, controlaram o veículo em um ambiente não estruturado. Neles, o veículo foi capaz de se guiar pelo campo vetorial e desviar de obstáculos em seu caminho. Espera-se que a incorporação de mais sensores e um sistema localização mais preciso permita que o carro navegue por ambientes mais complexos utilizando a metodologia proposta neste trabalho.
Junior, Joao Bosco Silvino. "Desenvolvimento de um sistema automatizado para captura e comparação de estriamentos de projéteis de armas de fogo." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/GASP-8BNFER.
Повний текст джерелаO crescente uso de armas de fogo na prática de crimes tem sido umapreocupação constante dos órgãos de investigação policial. A detecção de crimes relacionados entre si é uma ferramenta poderosa que pode ser decisiva no desvendamento de uma ação delitiva. O desenvolvimento de um sistema capaz de detectar o uso de uma mesma arma em crimes diferentes torna-se uma necessidade para os órgãos de polícia técnico-científica, pois abre um novo leque de informações que antes não era possível, dada a complexidadee demora nos processos de confronto balístico. Este trabalho apresenta-se como o indício do desenvolvimento de um equipamento com tecnologia nacional para a microcomparação balística automáticade projéteis. Nele é apresentado o mecanismo de aquisição da imagem do projetil, uma metodologia de montagem desta imagem e também de comparação entre os microestriamentos, determinando o grau de semelhançaa entre as amostras colhidas utilizando a Função de Correlação Cruzada (FCC). Os principais resultados alcançados foram a captura e a montagem da imagem da área lateral de um objeto tridimensional e comparação das imagens das amostras adquiridas. Estas comparações permitiram determinar quais amostras foram produzidas pela mesma arma. Espera-se, com o desenvolvimento futuro deste trabalho, que possa ser produzida uma solução brasileira para a microcomparação balística automática e busca de casos relacionados em um banco de dados.
Moreira, Marco Aurelio Guimaraes. "Localização, modelagem e controle de um helimodelo em ambientes internos." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/GASP-8BNFB9.
Повний текст джерелаEste trabalho aborda o problema de robotização de um helimodelo comercial de pequeno porte para operação em ambientes internos. A solução para o problema ´e dividida em três sub-tarefas: projeto e implementação de algoritmos de localização, desenvolvimento da modelagem matemática do helimodelo e projeto e implementação de leis de controle. Para localização, propõe-se a combinação de informações provenientes de um sistema de visão estéreo e de sensores inerciais via Filtragem de Kalman. Os estados estimados, que compreendem posições e velocidades lineares e angulares, são usados em conjunto com os sinais de comando do piloto para estimar, por meio de métodos de identificação, os parâmetros de um modelo caixa-cinza. De posse do modelo dinâmico do helimodelo, são projetados os controladores. Inicialmente, são feitos testes numa plataforma que restringe o movimento do helimodelo a variações nos ângulos de atitude. Em seguida, o controle é feito sem qualquer mecanismo de restrição de movimentos, utilizando-se controladores PID clássicos em cascata. Resultados experimentais mostram a estabilização de todos os graus de liberdade do helimodelo.
FRANCHETTO, ANDREA. "Le metallicità del gas nelle galassie a disco della survey GASP osservate da MUSE." Doctoral thesis, Università degli studi di Padova, 2022. http://hdl.handle.net/11577/3448825.
Повний текст джерелаThe aim of this Ph.D. Thesis is to investigate the distribution of the ionized gas metallicity in local disk galaxies, probing the relations with galaxy properties and the environment. The metals are the products of the stellar nucleosynthesis, therefore the gas metallicity is the result of the cumulative history of star formation, but also encodes the episodes affecting the gas component, which, in turn, are strictly connected to the environment. In other words, the gas metallicity is a fundamental tracer to study galaxy formation and evolution. In this Thesis I exploit the integral-field spectroscopic data from the GAs Stripping Phenomena in galaxies with MUSE (GASP; Poggianti et al., 2017) survey, which collected high quality observations of galaxies in different environments, including cluster galaxies with extraplanar gas tails as a consequence of ram pressure stripping. These data allow me to explore in detail the spatially resolved distribution of the ionized gas emission not only within the galaxy disk but also along the gas stripped beyond the stellar extent. For each galaxy in the sample I derive the gas metallicity map using the PYQZ code, the disk inclination, the position angle, and the effective radius. Initially, I explore the gas metallicity at the effective radius of a sub-sample of GASP, constituted of 29 cluster galaxies undergoing ram pressure stripping, and 32 cluster and field galaxies with no signs of gas disturbance for a reference comparison. These galaxies show a well-defined stellar mass-gas metallicity relation in the stellar mass range 10^9.25 < M < 10^11.5 Msun. At any given mass, reference cluster and stripping galaxies have similar metallicities, while the field galaxies with M < 10^10.25 Msun show on average lower gas metallicity than galaxies in clusters. The results indicate that ram pressure stripping is not significantly affecting the gas metallicity, at least at the effective radius. Rather, signs of an anticorrelation between the metallicity and the star formation rate are observed, in agreement with previous studies. Then, I investigate the distribution of gas metallicity gradients as a function of stellar mass, exploiting a larger sample of 85 GASP galaxies and a sample of ~1800 disk galaxies from MaNGA (Mapping Nearby Galaxies at Apache Point Observatory; Bundy et al., 2015), divided in field and cluster galaxies. Overall, metallicity profiles steepen with increasing stellar mass up to 10^10.3 Msun and flatten out at higher masses. Cluster galaxies have systematically flatter metallicity profiles than their field counterparts. Combining the results from the metallicity profiles and the stellar mass surface density gradients, the observed steepening can be interpreted as a consequence of local metal enrichment due to in-situ star formation during the inside-out formation of disk galaxies. The metallicity gradient-stellar mass relation is characterized by a rather large scatter, especially for 10^9.8 < M < 10^10.5 Msun. In addition, metallicity gradients anti-correlate with the galaxy gas fraction, justifying the differences of metallicity profiles between galaxies in different environments. Finally, I carry out a detailed analysis of the gas metallicity of star-forming clumps in the tails of four extreme ram pressure stripping galaxies. The oxygen abundance of the stripped gas decreases as a function of the distance from the parent galaxy disk. The observed metallicity profiles indicate that more than 50% of the most metal-poor stripped clouds are constituted by cooled intracluster medium. This is the first time that such a process is observed using the gas metallicity, and finds qualitative agreement with simulations that predict mixing between the metal-rich interstellar medium and the metal-poor intracluster medium. At the same time these results provide key constraints to theoretical models investigating this phenomenon.
Tangstad, Jan Runar. "Assessment of dynamic barriers in oil/gas well operations : Vurdering av dynamiske barrierer i olje/gass brønner." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produksjons- og kvalitetsteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27255.
Повний текст джерелаPredrag, Kojić. "Hidrodinamika i prenos mase u airlift reaktoru sa membranom." Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=100280&source=NDLTD&language=en.
Повний текст джерелаAn objective of this study was to investigate the hydrodynamics and the gas-liquid mass transfer coefficient of an external-loop airlift membrane reactor (ELAMR). The ELAMR was operated in two modes: without (mode A), and with bubbles in the downcomer (mode B), depending on the liquid level in the gas separator. The influence of superficial gas velocity, gas distributor’s geometry and various diluted alcohol solutions on hydrodynamics and gas-liquid mass transfer coefficient of the ELAMR was studied. Results are commented with respect to the external loop airlift reactor of the same geometry but without membrane in the downcomer (ELAR). The gas holdup values in the riser and the downcomer were obtained by measuring the pressures at the bottom and the top of the riser and downcomer using piezometric tubes. The liquid velocity in the downcomer was determined by the tracer response method by two conductivity probes in the downcomer. The volumetric mass transfer coefficient was obtained by using the dynamic oxygenation method by dissolved oxygen probe. According to experimental results gas holdup, liquid velocity and gas-liquid mass transfer coefficient depend on superficial gas velocity, type of alcohol solution and gas distributor for both reactors. Due to the presence of the multichannel membrane in the downcomer, the overall hydrodynamic resistance increased up to 90%, the liquid velocity in the downcomer decreased up to 50%, while the gas holdup in the riser of the ELAMR increased maximally by 16%. The values of the gas holdup, the liquid velocity and the gas-liquid mass transfer coefficient predicted by the application of empirical power law correlations and feed forward back propagation neural network (ANN) are in very good agreement with experimental values.
Takashina, Kei. "Magneto-transport studies of GaSb/InAs/GaSb double heterostructures." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249279.
Повний текст джерелаShahnaz, Sabina. "Gas flux estimation from surface gas concentrations." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55073.
Повний текст джерелаZanker, Matthew John. "Real gas effects in heated gas inflators." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/768.
Повний текст джерелаSchulz, Nicola. "GaSb-basierende Halbleiter-Scheibenlaser." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:25-opus-44312.
Повний текст джерелаWark, Michael. "Farbstoffmoleküle und Halbleiter-Nanopartikel in den Poren von Molekularsieben Einfluss von Wirt-Gast- und Gast-Gast-Beziehungen auf die optischen Eigenschaften /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=982611293.
Повний текст джерелаCAVANA, MARCO. "Gas network modelling for a multi-gas system." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2850606.
Повний текст джерелаAbdalsadig, M. "Gas lift optimization utilising automation gas lift valve." Thesis, University of Salford, 2017. http://usir.salford.ac.uk/44593/.
Повний текст джерелаLabed, Ismail. "Gas-condensate flow modelling for shale gas reservoirs." Thesis, Robert Gordon University, 2016. http://hdl.handle.net/10059/2144.
Повний текст джерелаLobova, A., J. Sitnik, A. Spivak, and V. Gavrilova. "Gas compressors." Thesis, Вид-во СумДУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/17049.
Повний текст джерелаMulyadi, Henny. "Determination of residual gas staturation and gas-water relative permeability in water-driven gas reserviors /." Full text available, 2002. http://adt.curtin.edu.au/theses/available/adt-WCU20030702.131009.
Повний текст джерелаMulyadi, Henny. "Determination of residual gas saturation and gas-water relative permeability in water-driven gas reservoirs." Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/1294.
Повний текст джерелаMulyadi, Henny. "Determination of residual gas saturation and gas-water relative permeability in water-driven gas reservoirs." Curtin University of Technology, Department of Petroleum Engineering, 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12957.
Повний текст джерелаwere compared.The evidence suggested that steady-state displacement and co-current imbibition tests are the most representative techniques for reservoir application. Steady-state displacement also yields the complete relative permeability (RP) data but it requires long stabilisation times and is costly.In the third stage, a new technique was successfully developed for determining both Sgr and gas-water RP data. The new method consists of an initial co-current imbibition experiment followed by the newly developed correlation (Mulyadi, Amin and Kennaird correlation). Co-current imbibition is used to measure the end-point data, for example, initial water saturation (Swi) and Sgr. The MAK correlation was developed to extend the co-current imbibition test by generating gas-water relative permeability data. Unlike previous correlations, MAK correlation is unique because it incorporates and exhibits the formation properties, reservoir conditions and fluid properties (for example, permeability, porosity, interfacial tension and gas density) to generate the RP curves. The accuracy and applicability of MAK correlations were investigated with several sets of gas-water RP data measured by steady-state displacement tests for various gas reservoirs in Australia, New Zealand, South-East Asia and U.S.A. The MAK correlation proved superior to previously developed correlations to demonstrate its robustness.The purpose of the final stage was to aggressively pursue the possibility of advancing the application of the new technique beyond special core analysis (SCAL). As MAK correlation is successful in describing gas water RP in a core plug scale, it is possible to extend its application to describe the overall reservoir flow behaviour. This investigation was achieved by implementing MAK correlation into a 3-D reservoir simulator (MoReS) and performing simulations on a producing ++
field.The simulation studies were divided into two categories: pre and post upscaled application.The case studies were performed on two X gas-condensate fields: X1 (post upscaled) and X2 (pre upscaled) fields. Since MAK correlation was developed for gas-water systems, several modifications were required to account for the effect of the additional phase (oil) on gas and water RP in gas-condensate systems. In this case, oil RP data was generated by Corey's equations. Five different case studies were performed to investigate the individual and combination effect of implementing MAK correlation, alternative Swi and Sgr correlations and refining porosity and permeability clustering. Moreover, MAK correlation has proven to be effective as an approximation technique for cell by cell simulation to advance reservoir simulation technology.
Ozturk, Bulent. "Simulation Of Depleted Gas Reservoir For Underground Gas Storage." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605723/index.pdf.
Повний текст джерелаtake or pay&rdquo
approach creates problems since the demand for natural gas varies during the year and the excess amount of natural gas should be stored. In this study, an underground gas storage project is evaluated in a depleted gas Field M. After gathering all necessary reservoir, fluid, production and pressure data, the data were adapted to computer language, which was used in a commercial simulator software (IMEX) that is the CMG&rsquo
s (Computer Modelling Group) new generation adoptive simulator, to reach the history matching. The history matching which consists of the 4 year of production of the gas reservoir is the first step of this study. The simulation program was able to accomplish a good history match with the given parameters of the reservoir. Using the history match as a base, five different scenarios were created and forecast the injection and withdrawal performance of the reservoir. These scenarios includes 5 newly drilled horizontal wells which were used in combinations with the existing wells. With a predetermined injection rate of 13 MMcf/D was set for all the wells and among the 5 scenarios, 5 horizontal &ndash
6 vertical injectors &
5 horizontal - 6 vertical producers is the most successful in handling the gas inventory and the time it takes for a gas injection and production period. After the determination of the well configuration, the optimum injection rate for the entire field was obtained and found to be 130 MMcf/D by running different injection rates for all wells and then for only horizontal wells different injection rates were applied with a constant injection rate of 130 MMcf/d for vertical wells. Then it has been found that it is better to apply the 5th scenario which includes 5 horizontal &ndash
6 vertical injectors &
5 horizontal - 6 vertical producers having an injection rate of 130 MMcf/d for horizontal and vertical wells. Since within the 5th scenario, changing the injection rate to 1.3 Bcf/d and 13 Bcf/d, did not effect and change the average reservoir pressure significantly, it is best to carry out the project with the optimum injection rate which is 130 MMcf/d. The total gas produced untill 2012 is 394 BCF and the gas injected is 340 BCF where the maximum average reservoir pressure was recovered and set into a new value of 1881 psi by injection and cushion gas pressure as 1371 psi by withdrawal. If 5th scenario is compared with the others, there is an increase in injection and production performance about 90%.
Ogaji, S. O. T. "Advanced gas-path fault diagnostics for stationary gas turbines." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/5797.
Повний текст джерелаPan, Jin. "Gas Entrainment in Two-Phase Gas-Liquid Slug Flow." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516177.
Повний текст джерелаZou, Jie. "Assessment of Gas Adsorption Capacity in Shale Gas Reservoirs." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75387.
Повний текст джерелаBähtz, Carsten. "Wirt-Gast-Systeme mit Zeolithen." [S.l. : s.n.], 2000. http://elib.tu-darmstadt.de/diss/000095.
Повний текст джерелаSimon, Lena. "Semiklassische Dynamik ultrakalter Bose-Gase." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-106246.
Повний текст джерелаThe dynamics of initially non equilibrium interacting quantum many body systems is an ongoing and interesting field of research. It is still an open question in which form relaxation occurs in such systems, and in which observables and on which timescales a possible thermalization might appear. A perfect playground for the investigations of relaxation dynamics in interacting many body schemes is provided by ultracold quantum gases, which are easily to be controlled and varied in experiments. However, a general theoretical framework for the investigation of such processes is still missing, due to the huge amount of involved degrees of freedom. One of the main theoretical tools in the field of ultracold bosonic gases represents the famous Gross-Pitaevskii equation, a field equation for the Bose-Einstein condensate wave function in terms of a mean-field approximation. However, the underlying approximation prevents the possibility to draw non-trivial conclusions about the full N-particle state, the information of which is necessary for the analysis of relaxation processes. To gain the theoretical description of the full bosonic field, the present thesis deals with the application of semiclassical methods to ultracold boson gases. Those techniques become in general exact, as long as the involved actions are large compared to Planck's constant. For many body systems it turns out that semiclassics are expected to give good results also for the condition of high particle numbers, which is precisely fulfilled in these schemes, making the semiclassical approaches promising. As an essential model system an initially out of equilibrium ultracold bosonic double-well system is investigated. This configuration provides highly interesting dynamics due to the interplay of the tunneling dynamics on the one hand and the interaction amongst the particles on the other. The special trap geometry makes exact numerical calculations in the framework of the two-mode approximation available, which serve in the following as reference data. By applying the common semiclassical WKB approximation and the reflection principle known from molecule physics, a closed analytical expression for the so-called population imbalance of the bosons in the double-well is derived, depending only on the few relevant system parameters. This mighty formula allows for the first time the quantitative investigation of the characteristic sequence consisting of oscillations, collapse and revivals in dependence on the parameters of the system. Since the semiclassical approaches succeeded for the double-well model so far the so-called Herman-Kluk propagator is adopted, to go beyond the reduced dynamics of the population imbalance. The propagator provides the possibility to treat the full N-particle state theoretically and is introduced for the most general case of a bosonic quantum field. Its application to the double-well system yields for all investigated parameter regimes very good agreement with the numerical exact results. Furthermore the outcomes are compared to the Truncated Wigner approximation, which is frequently used in the research field of ultracold bosons. This approach pictures the time evolution of a Wigner distribution, without taking into account the quantum interferences. In the present thesis it is shown that the Herman-Kluk propagation goes clearly beyond the truncated Wigner approach by considering in addition the quantum phases: The propagator is able to reproduce all of the distinctive features of the double-well dynamics. In order to test the performance of semiclassical methods in matters of even more complex systems, the ultracold bosonic triple-well model is finally considered, which exhibits unlike the double-well scheme chaotic regions in phase space. It turns out that the semiclassical propagation outplays again the truncated Wigner approximation. On the other hand the instability of the highly chaotic trajectories causes numerical problems, which have to be solved in the future
Snow, Paul Alistair. "Time-resolved spectroscopy of GaSb." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308681.
Повний текст джерелаLorenz, Gabriele, and Adolf Muschg. "Helvetia zu Gast in Sachsen." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-148486.
Повний текст джерелаLo, Iacono Andrea. "Ruolo della reazione di Water Gas Shift nella produzione di gas di sintesi da bio gas." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15806/.
Повний текст джерелаTRAVAGLINI, ROMINA. "Modelli BGK ed equazioni di reazione-diffusione per miscele reagenti di gas monoatomici e poliatomici." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2022. http://hdl.handle.net/11380/1265254.
Повний текст джерелаThe study of gas flows is an issue that nowadays responds to the necessities of various fields of research, as aerospace engineering, climate studies, energy industries, etc. For this reason, the construction of mathematical models simulating the behavior of real gas mixtures is extremely useful. Among all possible approaches, the kinetic one, based on Boltzmann equations for species distribution functions, seems to be a very powerful tool. It allows, in fact, to describe mixtures starting from interaction among particles, with the possibility of deriving models for the behavior of the global system at observable level. The work of this thesis is devoted to considering results obtained so far for mixtures of gases and extending them considering more real-like cases, such as mixtures of monoatomic and polyatomic gas species, that may also interact inelastically or chemically. As first, we provide an introduction in which the basic concepts and the most relevant results for kinetic description of gases are presented, along with a more detailed summary of the work carried out in the thesis. In Chapter 1, we propose the study of a reacting mixture of four gases using the classical Boltzmann kinetic theory. This case was already analyzed when the four gases are considered to have the same number of internal energy levels. We generalize it allowing each of the gas species to have a different number of energetic levels. Chapter 2 and Chapter 3 are devoted to the study of gas mixtures using a kinetic approach of BGK type. In particular, in Chapter 2 we provide a BGK model for an inert mixture of monatomic and polyatomic gases. We prove the consistency of the model and analyze the stability of equilibria, then we derive macroscopic equations and perform some numerical simulations being inspired by real gases. In Chapter 3, instead, we propose two BGK models for mixtures of reacting gases. In the first one we have four gas species involved in a reversible chemical reaction, in the second case eight gases react through two disjoint reactions. The previous strategy is applied to both cases, the main differences are in proving the consistency of the model, since we face more complicate transcendental equations to determine all the parameters. Also in these cases, numerical simulations are performed to reproduce the behavior of real reacting mixtures. In the remaining part of the thesis, we study gas mixtures using different techniques. In Chapter 4 we consider a mixture of five gas species, three of them constituting a background medium in which the other two interact. Encounters among particles can be elastic, inelastic, or chemical and we suppose that they occur at different time scales. We write classical Boltzmann equations for the interacting components, we pass to the asymptotic diffusive limit and, by means of suitable integrations of the kinetic equations, we obtain reaction-diffusion equations for densities of the species. Specifically, we apply this procedure in three different hydrodynamic regimes, obtaining in each case a proper reaction-diffusion system. The stability properties of these systems are then studied in Chapter 5. We consider the possibility of having Turing instability for a suitable choice of internal energy amounts and of collision frequencies. Through numerical simulations, we verify the formation of spatial patterns in the evolution of the number densities of reactants, as predicted by Turing analysis. We conclude with some further observations and perspectives for a future development of the present research work.
Цибуленко, Ю. М. "Експериментальні результати вимірювання екситонних спектрів GaSe і (KOH)GaSe при 293 К і 77 К". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40970.
Повний текст джерелаLazzari, Jean-Louis. "Etude des hétérostructures GaInAsSb/GaSb et GaAlAsSb/GaSb et de composants lasers et détecteurs à base de GaSb opérant entre 2 et 2,5 mu m." Montpellier 2, 1993. http://www.theses.fr/1993MON20121.
Повний текст джерелаBloemhof, Barbara Lynn Mestelman Stuart. "Market power and the sale of Ontario residential natural gas: An institutional analysis and a laboratory experiment." *McMaster only, 2004.
Знайти повний текст джерелаGrover, Tarun. "Natural gas hydrates - issues for gas production and geomechanical stability." Texas A&M University, 2008. http://hdl.handle.net/1969.1/86049.
Повний текст джерелаEriksson, Sara. "Development of catalysts for natural gas-fired gas turbine combustors." Doctoral thesis, Stockholm : Department of Chemical and Engineering and Technology, School of Chemical Science and Engineering, KTH - Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4239.
Повний текст джерелаAsh, Peter William. "Studies of tin oxide gas sensors for gas chromatographic detection." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2066.
Повний текст джерелаNandakumar, Neha. "Computational models of natural gas markets for gas-fired generators." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/108213.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 69-72).
Climate change is a major factor reforming the world's energy landscape today, and as electricity consumes 40% of total energy, huge efforts are being undertaken to reduce the carbon footprint within the electricity sector. The electric sector has been taking steps to reform the grid, retiring carbon-intensive coal plants, increasing renewable penetration, and introducing cyber elements end-to-end for monitoring, estimating, and controlling devices, systems, and markets. Due to retirements of coal plants, discovery of shale gas leading to low natural gas prices, and geopolitical motives to reduce dependence on foreign oil, natural gas is becoming a major fuel source for electricity around the United States. In addition, with increasingly intermittent renewable sources in the grid, there is a need for a readily available, clean, and flexible back-up fuel; natural gas is sought after in New England to serve this purpose as a reliable and guaranteed fuel in times when wind turbines and solar panels cannot produce. While research has been conducted advocating natural gas pipeline expansion projects to ensure this reliability, not enough attention has been paid to the overall market structure in the natural gas and electricity infrastructures which can also impact reliable delivery of gas and therefore efficient interdependency between the two infrastructures. This thesis explores the market structures in natural gas and electricity, the interdependence of natural gas and electricity prices with increasing reliance on natural gas as the penetration of renewable energy resources (RER) increases in order to complement their intermittencies, possible volatilities in these prices with varying penetration rates in RER, and alternatives to existing market structures that improve reliability and reduce volatility in electricity and gas prices. In particular, the thesis will attempt to answer the following two questions: What will the generation mix look like in 2030 and how will this impact gas and electricity prices? How do Gas-Fired Generator (GFG) bids for gas change between 2015 and 2030? In order to answer these questions, a computational model is determined using regression analysis tools and an auction model. Data from the New England region in terms of prices, generation, and demand is used to determine these models.
by Neha Nandakumar.
S.M. in Technology and Policy
Rexer, Thomas. "Nanopore characterisation and gas sorption potential of European gas shales." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2597.
Повний текст джерелаNwachukwu, Arthur Nwachukwu. "Improved ground-gas risk prediction using in-borehole gas monitoring." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/improved-groundgas-risk-prediction-using-inborehole-gas-monitoring(610a2b47-5fcd-483d-93d4-a193179d227b).html.
Повний текст джерелаHepola, Jouko. "Sulfur transformations in catalytic hot-gas cleaning of gasification gas /." Espoo [Finland] : Technical Research Centre of Finland, 2000. http://www.vtt.fi/inf/pdf/publications/2000/P425.pdf.
Повний текст джерелаTian, Jian Atwood J. L. "Molecular organic solids for gas adsorption and solid-gas interaction." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6882.
Повний текст джерелаZhang, Chen. "Piezoelectric-Based Gas Sensors for Harsh Environment Gas Component Monitoring." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538769/.
Повний текст джерелаMonasterio, Muñoz Lyris Marlene. "Elaboración y cata de vinos - GA55 201801." Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/624412.
Повний текст джерелаSteven, Richard. "Wet gas metering." Thesis, University of Strathclyde, 2001. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21419.
Повний текст джерелаRyan, Benjamin Thomas. "Polymeric gas sensors." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531149.
Повний текст джерела