Дисертації з теми "Conversion de modes"
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Girel, Etienne. "Modes de stabilisation innovants de catalyseurs pour la conversion de la biomasse." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1214.
Biomass transformation reactions are carried under very different conditions from those used in petroleum industry. Some bio-products are transformed in aqueous phase underhigh temperatures (hydrothermal conditions). Heterogeneous catalysts are most likely made with a porous oxide like alumina witch is not suited for such conditions. Its textural and structural properties are modified during the treatment making the material incompatible with any process. The aim of the thesis is to develop new catalytic materials with hydrothermal stability properties adapted to the treatment of biomass products. The strategy is to modify alumina surface in order to make it insensitive to water during a hydrothermal treatment. The surface modification is done with inorganic (silicon) and organic (carbon, polyols) additives.We show here that alumina is stable only if some specific hydroxyls located in basal surfaces of crystallites are saturated. We develop strategy to selectively cover those sites with carbon or silica. A very good hydrothermal stability is obtained with a surface coverage close to 20% only. Then, a metal phase is deposited on the stabilized supports and catalytic performances of the materials are evaluated through the glycerol hydrogenolysis reaction
Skinner, Jacob Charles. "Energy Down-Conversion Between Classical Electromagnetic Modes via a Quantum Mechanical RF-SQUID." Thesis, University of Sussex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487564.
Chihani, Omar. "Etude de la fiabilité de composants GaN en conversion d'énergie." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0148/document.
The aeronautical and terrestrial transport industries know a steady increase in the electrification of their functions. In fact, the mechanical or hydraulic actuators are gradually replaced by electric ones.The components dominating the market today seem unable to follow the trend anymore. In fact, silicon-based power components still prevail in the current market, thanks to their low cost. However, this material begins to reach its theoretical limits in terms of performance. In this context, different wide bandgap semiconductor structures are emerging to take on from silicon.The aim of this study is to assess the reliability of power transistors based on Gallium Nitride. These components are very promising for medium power applications. However, the failure mechanisms of these components are not yet sufficiently studied. The study consists in the application of aging tests combining thermal and electrical stresses. These agings are carried out under different conditions of tension and temperature. The objective of this method is, firstly, to isolate the effect of each stressor on the state of the components, and secondly, to identify the failure mechanisms activated according to the aging conditions.This work made it possible to identify the existence of different failure mechanisms that can be activated according to the aging conditions. Indeed, it has emerged that the aging temperature range used influences the predominance of activated failure mechanisms. The results challenge the adequacy of current qualification standards for Gallium Nitride components. These standards should revise upwards the aging temperatures used to cover ranges closer to the operating temperatures of this kind of components
Roudet, James. "Analyse et comparaison des divers modes de conversion statique CC-CC : modes de commutation et sûreté de fonctionnement, performances CEM." Grenoble INPG, 1990. http://www.theses.fr/1990INPG0139.
Bonnelle, Denis. "Tour solaire, tour à vaporisation d'eau, et modes de conversion d'énergie renouvelable : présentation, critiques et suggestions." Lyon 1, 2004. http://www.theses.fr/2004LYO10129.
Wang, Feng. "Modes, Excitation and Applications of Plasmonic Nano-apertures and Nano-cavities." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1348588159.
Farhat, Youssef. "Study of Reverberation in a Bilayer Media : Application to the Measurement of Viscosity." Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2023. http://www.theses.fr/2023ISAB0006.
Classical ultrasonic testing (UT) is a method used to evaluate the parameters of materials using mechanical wave. Most of these methods provide local information about the properties of the medium along the direct paths between emitter and receiver. Yet, some of these methods depend on the coda or late reflections, which provide global information about the medium. In this work, a method inspired by room acoustic techniques is proposed to determine medium properties. In fact, the reverberated signal is highly sensitive to mechanical parameters and boundary conditions. In acoustic room theory, which uses these reverberated signals, for determination of the reverberation time which is very useful to enhance the sound quality of rooms. However, this technique only works for one propagation mode, since the wave propagates through the air inside the acoustic room. In contrast to fluids, at least two propagation modes occur in a homogeneous and isotropic solid medium. However, by considering that a solid medium is analogous to the acoustic cavity, the walls are equivalent to boundary conditions. Firstly, a model is developed to estimate the acoustic intensity of each propagation mode in solid medium taking into account the coupling due to mode conversion. It allows the reverberation time to be estimated in solid medium. Secondly, an experimental setup is proposed. A five piezoelectric (PZT) patches, randomly distributed on an aluminum block, one acting as an emitter and the others as receivers to perform experimental reverberation time measurements. Then, a comparison between the simulated and experimental results is done, and inverse problem solving is performed to retrieve the attenuations. A good agreement between the retrieved and literature attenuation values of both bulk waves has been observed in aluminum. Finally, using the retrieved attenuation of bulk waves, the work has been extended to multilayer system, such as the solid medium is surrounded by different fluids at its boundaries. It has been demonstrated that the reverberation time is directly related to the mechanical parameters of the surrounded fluid, such as density, celerity, and their viscosity
Wilson, Daniel W. "Optical waveguiding in photorefractive crystals : photoinduced polarization conversion and electron waveguiding in semiconductor nanostructures : modes, directional coupling, and discontinuities." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/14934.
Obeid, Hussein. "Contribution à la commande et à l'observation adaptatives par modes glissants d'ordres supérieurs : Application aux systèmes de gestion de l'énergie." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA023/document.
This thesis deals with the development of novel strategies to adapt higher order sliding mode controllers and observers. The implementation of classics first order and higher order sliding mode controllers requires the knowledge of the upper bound of the disturbance or its derivative, which are often not known. The first contribution of this thesis is the design of an adaptive strategy that can ensure the convergence of the sliding variable to a predefined neighborhood of zero without requiring any information of the disturbance or its derivative and without overestimating the adaptive gain. This adaptive strategy is then declined for the design of the first order, second order and integral sliding mode controllers, and for the Levant's differentiator. The second contribution of the thesis is the development of two adaptive strategies for discontinuous higher order sliding mode control. The proposed two algorithms can provide the achievement of n-order sliding mode despite disturbances with unknown upper bounds or with unknown upper bounds of their derivatives. Finally, in order to show the effectiveness of the proposed algorithms, they are successfully applied through simulations to control the wind energy conversion system and the linear induction motor system for cogeneration
Cabral, Sânzio Fernandes. "Fluxo de operações ligadas à análise de contas no TCE/PB sob a ótica dos modos de conversão do conhecimento organizacional." Universidade Federal da Paraíba, 2008. http://tede.biblioteca.ufpb.br:8080/handle/tede/3788.
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In the current context of transformation, the so called knowledge organizations seek to integrate, at least, three important components: infrastructure, people and technology. In this study, it is supposed that the process of knowledge management should consider this trilogy integrated. This research aimed to describe the main flow of operations related to the Analysis of Municipal Accounts in TCE-PB, external controlization of the state of Paraiba, from the perspective of modes of conversion of organizational knowledge. This investigation characterized itself as a basic search, with a mixed qualitative and quantitative as well as descriptive and exploratory approach, also using as technical procedures the bibliographic review, and the single case study method, limited to five Divisions of Monitoring of Municipal Management. The search tools used were the questionnaire, the focus group, quantitative statistical analysis and qualitative analysis of content, respectively. Through this case, it was found the need of technology to be properly harnessed, because it is used merely as tool for serving data without significant support for people, despite a good infrastructure. In addition to conditioning factors of the process of knowledge management, such as centralization of decisions and organizational culture in the public sector, it has shown that the knowledge creation process faces a number of baniers such as the absence of the practice of outsourcing and socialization, due to a misunderstanding of the concepts of socialization and combination. It was conclued that the flow of operations in the review of municipal accounts are handcared lack of incentive to the best practices of dissemination of tacit knowledge between servers and preservation of organizational memory, such as formation of discussion groups, expertises maps and disclosure of creative methods of network analysis.
No atual contexto de transformação, as chamadas organizações do conhecimento buscam integrar, pelo menos três componentes essenciais: infraestrutura, pessoas e tecnologia. Neste estudo, entende-se que o processo de gestão do conhecimento deve considerar essa trilogia integrada. O objetivo da pesquisa foi descrever o fluxo das operações relacionadas à Análise de Prestação de Contas no TCE-PB, órgão de controle externo do Estado da Paraíba, sob a ótica dos modos de conversão do conhecimento organizacional. Tal investigação se caracterizou como uma pesquisa básica, com abordagem mista quantitativo-qualitativa, enfoque descritivo-exploratório, usando também como procedimentos técnicos a pesquisa bibliográfica e documental e o método de estudo de caso único, limitado ao âmbito de cinco Divisões de Acompanhamento da Gestão Municipal do TCE-PB, envolvidas na análise de contas. Como instrumento de pesquisa, para a técnica de coleta e tratamento de dados, utilizaram-se o questionário, o grupo focal e a análise de conteúdo qualitativa e de procedimentos estatísticos, respectivamente. Por intermédio desse caso, foi constatada a necessidade de a tecnologia ser adequadamente aproveitada, pois é utilizada meramente como instrumento de veiculação de dados, sem expressivo suporte para as pessoas, apesar de uma boa infra-estrutura. Além de fatores condicionantes do processo de Gestão do Conhecimento, como centralização das decisões e a cultura organizacional do setor público, evidenciou-se que o processo de criação do conhecimento enfrenta uma série de lacunas, a partir da ausência da prática da externalização e da socialização, bem como da concepção equivocada entre o conceito de socialização e de combinação. Concluiu-se que o fluxo de operações da análise de prestação de contas municipais fica prejudicado pela falta de incentivo às melhores práticas de disseminação do conhecimento tácito entre servidores e à preservação da memória organizacional, tais como: formação de grupos de discussão, mapas de expertises e uso de métodos criativos de análise em rede.
Diblanc, Frédérique. "Conversion de fréquences optiques appliquée au blocage de modes d'un laser Nd/YAG impulsionnel et à l'analyse spectrale large bande." Limoges, 1996. http://www.theses.fr/1996LIMO0012.
Zou, Xiao-Lan. "Conversion linéaire de mode et diffusion d'ondes électromagnétiques par des fluctuations magnétiques dans un plasma." Paris 11, 1988. http://www.theses.fr/1988PA112282.
Bjork, David Eugène. "Logiques de conversion individuelle et logiques confessionnelles : les modes d'évangélisation mises en oeuvre par les pasteurs anglo-américains présents en France." Paris, EPHE, 2003. http://www.theses.fr/2003EPHE5035.
The question examined by this thesis is that of the experience of conversion in the Protestant Evangelical context and its role in the construction of a unique worldview. The study of several Evangelical groups, fruit of the work of Anglo-American missionaries in France, permits us to observe the variety and religious vitality of this transatlantic movement. It also reveals the dynamics by which these groups maintain the plausibility of their beliefs and their collective and individual sense of belonging. The experience of conversion, and of witnessing, is mot important among theses dynamics. Around this central question we privilege three orientations: the understanding of the mindset and religious experience of the North American Evangelical Missionaries, the examination of what is that these missionaries hope to accomplish and the ways in which they and their communities have been received by the French, the exposition of the influence of recent transformations in religious experience of the French on their work. By studying these Evangelical groups we wish to test, in the French context, the hypothesis of Christian Smith which suggests that a religious movement that unites both clear cultural distinction and intense social engagement will be capable of thriving in a pluralistic, modern society. We conclude that the Anglo-Saxon Evangelical missionaries have indeed been able to start communities in France which draw from their reading of the Bible, from their experience of conversion, and from their religious pilgrimage, convictions, perspectives, values and distinctive commitments which distinguish them in a positive and energizing way from their fellow citizens
Garcia, Jennifer A. "Conversion Theory Through the Cognitive Science of Religion Lense in a Christian-Muslim Context." Scholarship @ Claremont, 2012. http://scholarship.claremont.edu/scripps_theses/128.
Cros, Brigitte. "Évolution non linéaire des ondes de plasma excitées par conversion de mode au voisinage de la résonance de plasma : application aux expériences de modification de l'ionosphère." Paris 11, 1989. http://www.theses.fr/1989PA112373.
Sitel, Azzedine. "Méthodes de mesure des matrices acoustiques des discontinuités à un ou deux ports en présence des modes élevés." Compiègne, 2005. http://www.theses.fr/2005COMP1603.
This study presents the development of experimental methods to characterise a two-port discontinuity by measurement of its scattering and transmission matrices and its power dissipation, and a one-port discontinuity by measurement of its reflection matrix in higher order modes propagation conditions. This method is applied to the measurement of a scattering matrix of a straight cylindrical duct and a reactive chamber. Reflection and transmission matrices are measured for an open end coupled with a straight duct. With the use of the overdetermination on the number of loads, a good agreement was found between analytical and experimental scattering-matrix coefficients measured for the straight duct except near of eut-off frequencies. The test with the reactive type muffler shows that the load method fails in determining the coefficients associated to the wave coming in the discontinuity from the open side because modes are filtered by the reactive chamber. To characterise completely an asymmetrical section, an additionnel test after its inversion is therefore necessary. Results of transmission and reflection matrices shows that the overdetermination procedure on the number of source configurations improves the results. Ln another side, and in order to estimite the sensitivity of various methods to measurement errors, an analytical procedure of simulation of the experience is developed
Garayt, Jean-Philippe. "Etude de la réalisation d'un isolateur optique intégré sur verre." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSES044/document.
The development of optical-fiber telecommunications requires the insertion of optical isolator between lasers and fibers, in order to protect them against perturbating reflexions. This component is currently inserted in a bulk form, but the goal is to integrate it on the same wafer than the laser; nevertheless, this is problematic due to the difficulty to integrate good magnetooptical materials on usual substrates as glass or silicon. One of the promising way to achieve this, developped by the Laboratoire Hubert Curien, is the embedding of magnetic nanoparticles into a sol-gel matrix deposited above the optical guides. This thesis aimed at studying more deeply the main non-reciprocal component of integrated mode conversion optical isolators: the non-reciprocal rotator. A theorical and a practical study have both been performed, with numerical simulations to confront them. The theorical study aimed at describing the evolution of propagation in magnetooptical waveguides with respect to all effects, even absorption and dichroïsm. Then a practical study was performed on glass samples engineered in collaboration with IMEP-LAHC and the PHENIX laboratory, and lead to a full measurement of longitudinal and transverse magnetooptical effects, and their evolution related to the fabrication parameters of the samples. Finally, these results gave us a comprehensive view of how magnetooptical waveguides behave, and we were able to predict the good parameters to choose in order to construct, in a close future, a glass-integrated optical isolator
Lienhardt, Anne-Marie. "Étude de la commande et de l'observation d'une nouvelle structure de conversion d'énergie de type SMC (Convertiseur Multicellulaire Superposé)." Toulouse, INPT, 2006. http://ethesis.inp-toulouse.fr/archive/00000335/.
Dedicated to medium voltage high power applications, the Stacked Multicell Converter was developed and validated within the LEEI at the beginning of years 2000. The first part of this manuscript consists in a comparative study of the losses, performances and costs of IGBT-based 2 and 3-level topologies. The main objective is to legitimate the use of the SMC structure for low voltage/high power applications. The second part is dedicated to the observation of the SMC flying capacitor voltages. An active control of those voltages has to be introduced to ensure a good balancing of the voltage constraint over the power switches. Three estimation methods are presented: a voltage reconstruction, a digital real time simulation of the converter combined with a voltage measure and a sliding mode observer. The aim is to reduce the number of sensors and thus the SMC industrial cost. They were validated by simulation for a 7-level SMC. The sliding mode observer is confirmed experimentally
Parpiiev, Tymur. "Ultrafast magneto-acoustics in magnetostrictive materials." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1044/document.
With the advent of femtosecond lasers it became possible to measure how femtosecond optical demagnetization can probe the exchange interaction in ferromagnetic metals. Laser-induced demagnetization of materials with strong magneto-elastic coupling should lead to the release of its build-in strains, thus to the generation of both longitudinal (L) and shear (S) acoustic waves. In this thesis, generation of shear picosecond acoustic pulses in strongly magnetostrictive materials such as Terfenol is processed analytically and shown experimentally. In case of Terfenol with strong magneto-crystalline anisotropy, laser induced demagnetostriction is responsible for S excitation. First, the phenomenological model of direct magnetostriction in a Terfenol monocrystalline film is developed. The shear strain generation efficiency strongly depends on the orientation of the film magnetization. Time-resolved linear MOKE pump-probe experiments show that transient laser-induced release of the magnetoelastic strains lead to the excitation of GHz L and S acoustic waves. These results are the first experimental observation of picosecond shear acoustic wave excitation by laser-induced demagnetostriction mechanism. Second, the interaction of an optically generated L acoustic pulse with the magnetization of a Terfenol thin film is reported. Arrival of the picosecond strain wave alters a change of its magnetization and leads to acoustic mode conversion, which is another pathway of shear acoustic wave generation. The frequency bandwidth of the generated acoustic pulses matches the demagnetization timescale and lies in the range of several hundreds of GHz, close to 1 THz
Alectoridis, Dímitra. "Interação entre profissionais de contabilidade gerencial e gestão de operações: uma observação baseada na construção de conhecimento." Universidade Presbiteriana Mackenzie, 2015. http://tede.mackenzie.br/jspui/handle/tede/956.
The pursuit of excellence in action and consistent results makes professionals have responsibility in managing their own knowledge and transformation in these techniques and tools capable of broadening the qualitative and quantitative gains within departments and companies. Knowledge management well applied to professional practice is a way of ensure good results, but this should be shared - as individual knowledge - and built - as possibility of collective knowledge. This study aims to evaluate the interaction between professionals of management accounting, also called controllership, and operations management professionals, by the light of Nonaka and Takeuchi's theory (1997) on knowledge creation in the company. Its objective was to provide a measure able to identify the maturity level of professionals in each area on modes of knowledge convertion proposed in this theory, including creating entrepreneurial knowledge in the general context. The results show that the professionals care about their individual knowledge and the transmission of this to their own teams, in addition to being concerned about internalize explicit knowledge for themselves. But when evaluating the results of conversion modes that require further relationship with other teams and availability to create knowledge independent of the immediate need, we have a group of professionals evaluated showing restrictions, partly due to lack of incentive from the company, for lack of intent of other professionals for that. The measurement of the knowledge creation to company receives the impact of these restrictions, and the general result this research shows that there is need for improvement in the behavior of management accounting managers and operations managers for the Knowledge Creation bring more effective results for companies.
A busca pela excelência nas ações e por resultados sólidos faz com que os profissionais tenham responsabilidade na gestão de seus próprios conhecimentos e na transformação destes em técnicas e ferramentas capazes de ampliar os ganhos qualitativos e quantitativos nos departamentos e nas empresas. A gestão do conhecimento bem aplicado às práticas dos profissionais é um meio de garantir bons resultados, mas para isso deve ser compartilhado enquanto conhecimentos individuais e construído enquanto possibilidade de conhecimentos coletivos. Este trabalho objetiva avaliar a interação entre profissionais das áreas de contabilidade gerencial, também chamada de controladoria, e de profissionais de gestão de operações, sob a luz da teoria de Nonaka e Takeuchi (1997) da Criação de Conhecimento na empresa. Seu objetivo foi gerar uma mensuração capaz de identificar o nível de maturidade dos profissionais de cada área nos modos de conversão de conhecimento proposto nesta teoria, incluindo a criação de conhecimento empresarial no contexto geral. Os resultados encontrados mostram que os profissionais se preocupam com seu conhecimento individual e a transmissão deste para suas próprias equipes, além de se preocuparem em internalizar conhecimentos explícitos para si. Porém quando são avaliados os resultados dos modos de conversão que exigem maior relacionamento com outras equipes e disponibilidade para criar conhecimento independente da necessidade imediata, temos um grupo de profissionais avaliados que mostram restrições, parte em função da falta de incentivo da empresa, parte por falta de intenção dos outros profissionais para isso. A mensuração da criação de conhecimento para empresa recebe o impacto dessas restrições, e como resultado geral a pesquisa mostra que há necessidade de melhoria no comportamento dos gestores de contabilidade gerencial e gestores de operações para que a Criação de Conhecimento traga resultados mais efetivos para as empresas.
Sena, Edmar Avelar de. "O Islã do sudeste do Brasil: modos de adesão, identidades e dinâmicas sociais." Universidade Federal de Juiz de Fora, 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/979.
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Esta tese é fruto de um trabalho de campo realizado nas comunidades muçulmanas de Belo Horizonte, Rio de Janeiro e São Bernardo do Campo que procurou analisar como os crentes destas comunidades vivenciam sua crença frente à sociedade mais ampla em que estão inseridos. A opção por pesquisar três comunidades teve aqui o objetivo de ampliar o campo de investigação no intuito de entender a dinâmica destes grupos e questões fundamentais como adesão, identidade e dinâmicas sociais. Levou-se em consideração neste trabalho as diferenças entre as comunidades e a tendência de universalização que esta religião vem tomando na sociedade brasileira. Estas comunidades eram basicamente compostas por imigrantes sírios e libaneses, portanto eram comunidades étnicas, mas em um período de pouco mais de uma década, vem se reconfigurando a partir da conversão de brasileiros que, sem ascendência muçulmana têm aderido a esta religião. Este fenômeno das conversões ao Islã é um dos traços comuns nestas comunidades, consideradas, atualmente, comunidades mistas e não mais étnicas. Esta reconfiguração trouxe para o interior destas comunidades o dilema da identidade, uma vez que a adesão feita pelos novos membros diz respeito à religião muçulmana e não à cultura árabe. O Islã no Brasil se estrutura como mais uma religião, portanto mais uma opção religiosa, e apresenta-se como uma realidade plural, fato que torna estas comunidades socialmente dinâmicas em sua relação com a sociedade local marcando sua presença no cenário religioso brasileiro atual. Ao observar o cotidiano destas comunidades evidenciou-se aspectos da vida social, tais como a relação entre imigrantes e convertidos, a construção de uma identidade, a estrutura social e política.
This thesis is the result of fieldwork done with Muslim communities in Belo Horizonte, Rio de Janeiro and São Bernardo do Campo that tried to analyze how Muslims in this community experience their believes compared to a larger society in which they live. The option of studying three communities had here the main objective to expand the field of research in order to understand the dynamics of these groups and fundamental issues as accession identity and internal tensions. It was taken into consideration in this study the differences between communities and the tendency to universalize that this religion has been taking in Brazilian society. These communities were basically composed of Syrians and Lebanese immigrants, so these were ethnic communities, but in a period of just over a decade, they were reconfiguring from conversion of Brazilians without Muslin background adhered to this religion. This phenomenon of conversions to Islam is one of the common traits in these communities, considered now mixed communities and not ethnic. This reconfiguration brought into the dilemma of these communities identity, since conversions made by the new members, concerns muslin religion and not Arabian culture. Islam in Brazil is structured like one more religion therefore one more religious option, and presents itself as plural reality, a fact that makes these communities socially dynamic in their relationship with local society its making presence in the Brazilian religious scene. By observing the daily life of these communities, it was evident the aspects of social life, such as the relationship between immigrants and converts, building an identity and social structure and politics.
Forsyth, A. J. "Switched-mode power conversion." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233948.
Hamitouche, Zahia. "Études expérimentales et numériques de la propagation dans des guides d'onde à section linéairement variable." Le Havre, 2008. http://www.theses.fr/2008LEHA0003.
The aim of this work is to provide the experimental and numerical results on the behaviour of a Lamb wave in duraluminium elastic waveguides. These waveguides include an area of linearly varying section, located between two areas of constant thickness of 2 mm and 5 mm. These waveguides are only differing by the slope of their varying section domain. Several phenomena were observed : the adiabaticity of the Lamb modes in the area of varying section, the reflexion of an incident Lamb mode when it reaches its thickness cut-off in the varying section area and its transmission outside this zone by tunnel effect. The experimental and numerical results obtained show the existence of adiabatic waves in all the studied guides. In particular, the amplitude of normal displacements of the adiabatic S0 mode on the plane surface varies according to the thickness and shows a number of resonances located in this zone. The number and the positions of resonances are strongly depending of the varying section slope. If the same mode is propagated towards the decreasing thicknesses in a waveguide of strong slope, a transmission of this incident wave is observed at the end of the varying section domain into other modes. When the Lamb modes having cut-off are propagated towards the decreasing thicknesses, a reflexion at their thickness cut-off is observed. Nevertheless, a small part of their energy is transmitted by tunnel effect into other Lamb modes in the thinner part of the waveguide. The energy of the transmitted modes have been measured and represents a maximum of 2% of the energy of the incident mode. In addition, the varying section area shows a phenomenon of frequency filtering for the Lamb modes having cut-off. The experimental results are in good agreement with the numerical results. The numerical study allowed the obtention of a reliable predictive model and helped to highlight the physical meaning of the observed phenomenon
Yin, Changjie. "Impact of diesel generator operating modes on standalone DC microgrid and control strategies implying supercapacitor." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2411/document.
The intermittent and random nature of renewable sources, such as photovoltaic and wind turbine, asks for the complement of storage, such as battery and back-up energy, such as diesel generator, especially in a standalone power system. Concerning the diesel generator, it needs some time to start up and cannot immediately offer the needed power, due to its dynamic behavior. Hence, the power quality is lowered down during this period because of the shortage of power. Therefore, during the period of the diesel generator starting up, a supercapacitor is suggested to compensate the power balance because of its fast response and high power density. A power control strategy is proposed to achieve the coordination between diesel generator and supercapacitor. Both simulation and experimental results show that the proposed control strategy is able to regulate the DC bus voltage within the acceptable limits and supplying the load during the renewable power under generation or load step-increase situations. In addition, the supercapacitor can be also used to overcome the electrochemical storage limits like its state of charge and maximum current. So, this thesis proposes the real time power control for a hybrid photovoltaic-battery-supercapacitor-diesel generator DC microgrid system, aiming to meet the load power demand with reliability and stabilizing the DC bus voltage. Both simulation and experimental results show that the designed control strategy improves the DC microgrid dynamic and static performances under different operating conditions. Furthermore, in order to minimize the diesel generator energy cost, the fuel cost and fuel consumption are analysed through several experimental tests. Therefore, the optimal value of its power generation is deduced and applied in a newly proposed energy management strategy. This strategy can achieve the goal of maximizing the utilization of photovoltaic energy and taking into account the slow start-up characteristic and energy cost of diesel generator. Both simulation and experimental studies are carried out by using the real photovoltaic data to illustrate the performance and the behavior of the hybrid system. The obtained results verify the effectiveness of this strategy. Furthermore, the comparison with the previous energy management strategy, in which the diesel generator energy cost is not considered, demonstrates that the newly proposed energy management strategy can reduce the total cost of the hybrid DC power system
Woods, Anna Maria. "Mode conversion of plasma waves." Thesis, University of St Andrews, 1987. http://hdl.handle.net/10023/13965.
Rasmus, Siljedahl. "3D Conversion from CAD models to polygon models." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129881.
Layden, Andrew. "Mode Conversion Processes in Magnetized Plasmas." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10437.
O'Heron, Patrick James 1966, and Patrick James 1966 O'Heron. "A multibody model simulating tilt-wing conversion." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291353.
Harris, Carol, Michele Mascari, Kevin Rice, Jeff Smith, and John Steedman. "ASYNCHRONOUS TRANSFER MODE (ATM) CONVERSION DEVICE (ACD)." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/607525.
The Asynchronous Transfer Mode (ATM) Conversion Device (ACD) System is based on state-of-the-art ATM technology. The system interfaces between high-rate ECL/RS-422 raw data bitstreams and Synchronous Optical Network (SONET) OC-3 fiber. The SONET OC-3 interface uses ATM Adaptation Layer Type Five (AAL5) format. The system exceeds its 50 Mbps raw data, single stream requirement and provides single stream raw data throughput at rates up to 75 Mbps. With ATM and SONET packaging overhead, this translates into 90 Mbps on the OC-3 fiber. In addition to high-rate throughput, the system provides multiplexing and demultiplexing of multiple stream throughput based on the ATM cell header Virtual Path and Virtual Channel Identifier (VPI/VCI) values. The system is designed with the flexibility to provide between three and six throughput channels. All of which are multiplexed/demultiplexed to and from the same OC-3 interface. Multiple stream cumulative raw data throughput rates of up to 80 Mbps, or 96 Mbps on the fiber, have successfully run.
Schleyer, Fiona. "Linear mode conversion and Earth's continuum radiation." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21745.
Clabby, Darragh. "Wave energy conversion at prototype and model scales." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.673795.
Malik, Mohammad Rafi. "Reduced-orderCombustion Models for Innovative Energy Conversion Technologies." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/318799/4/TOC.pdf.
Le double défi de l'énergie et du changement climatique mettent en avant lanécessité de développer des nouvelles technologies de combustion, étantdonné que les projections les plus réalistes montrent que la plus grandeaugmentation de l'offre d'énergie pour les décennies à venir se fera à partirde combustibles fossiles. Ceci représente donc une forte motivation pour larecherche sur l'efficacité énergétique et les technologies propres. Parmicelles-ci, la combustion sans flamme est un concept nouvellementdéveloppé qui permet d'obtenir des rendements thermiques élevés avecdes économies de carburant tout en maintenant les émissions polluantes àun niveau très bas. L'intérêt croissant pour cette technologie est égalementmotivé par sa grande flexibilité de carburant, ce qui représente uneprécieuse opportunité pour les carburants à faible valeur calorifique, lesdéchets industriels à haute valeur calorifique et les combustibles à based'hydrogène. Etant donné que cette technologie est plutôt récente, elle estde ce fait encore mal comprise. Les solutions d'une application industriellesont très difficiles à transposer à d'autres. Pour améliorer les connaissancesdans le domaine de la combustion sans flamme, il est nécessaire de menerdes études fondamentales sur ce nouveau procédé de combustion afin defavoriser son développement. En particulier, il y a deux différencesmajeures par rapport aux flammes classiques :d’une part, les niveaux deturbulence rencontrés dans la combustion sans flamme sont rehaussés, enraison des gaz de recirculation, réduisant ainsi les échelles de mélange.D'autre part, les échelles chimiques sont augmentées, en raison de ladilution des réactifs. Par conséquent, les échelles turbulentes et chimiquessont du même ordre de grandeur, ce qui conduit à un couplage très fort.Après un examen approfondi de l'état de l'art sur la modélisation de lacombustion sans flamme, le coeur du projet représentera le développementd'une nouvelle approche pour le traitement de l'interaction turbulence /chimie pour les systèmes sans flamme dans le contexte des simulationsaux grandes échelles (Large Eddy Simulations, LES). Cette approche serafondée sur la méthode PCA (Principal Component Analysis) afin d'identifierles échelles chimiques de premier plan du processus d'oxydation. Cetteprocédure permettra de ne suivre sur la grille LES qu'un nombre réduit descalaires non conservés, ceux contrôlant l'évolution du système. Destechniques de régression non-linéaires seront couplées avec PCA afind’augmenter la précision et la réductibilité du modèle. Après avoir été validégrâce à des données expérimentales de problèmes simplifiés, le modèlesera mis à l'échelle afin de gérer des applications plus grandes, pertinentespour la combustion sans flamme. Les données expérimentales etnumériques seront validées en utilisant des indicateurs de validationappropriés pour évaluer les incertitudes expérimentales et numériques.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
McDougall-Bagnall, A. M. Dee. "MHD mode conversion of fast and slow magnetoacoustic waves in the solar corona." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1361.
Naswa, Sudhir. "Representation of Biochemical Pathway Models : Issues relating conversion of model representation from SBML to a commercial tool." Thesis, University of Skövde, School of Humanities and Informatics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-28.
Background: Computational simulation of complex biological networks lies at the heart of systems biology since it can confirm the conclusions drawn by experimental studies of biological networks and guide researchers to produce fresh hypotheses for further experimental validation. Since this iterative process helps in development of more realistic system models a variety of computational tools have been developed. In the absence of a common format for representation of models these tools were developed in different formats. As a result these tools became unable to exchange models amongst them, leading to development of SBML, a standard exchange format for computational models of biochemical networks. Here the formats of SBML and one of the commercial tools of systems biology are being compared to study the issues which may arise during conversion between their respective formats. A tool StoP has been developed to convert the format of SBML to the format of the selected tool.
Results: The basic format of SBML representation which is in the form of listings of various elements of a biochemical reaction system differs from the representation of the selected tool which is location oriented. In spite of this difference the various components of biochemical pathways including multiple compartments, global parameters, reactants, products, modifiers, reactions, kinetic formulas and reaction parameters could be converted from the SBML representation to the representation of the selected tool. The MathML representation of the kinetic formula in an SBML model can be converted to the string format of the selected tool. Some features of the SBML are not present in the selected tool. Similarly, the ability of the selected tool to declare parameters for locations, which are global to those locations and their children, is not present in the SBML.
Conclusions: Differences in representations of pathway models may include differences in terminologies, basic architecture, differences in capabilities of software’s, and adoption of different standards for similar things. But the overall similarity of domain of pathway models enables us to interconvert these representations. The selected tool should develop support for unit definitions, events and rules. Development of facility for parameter declaration at compartment level by SBML and facility for function declaration by the selected tool is recommended.
Markham, Paul N. "Conversion converted : a new model of Christian conversion in light of Wesleyan theology and nonreductive physicalism." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/1289/.
Taillefer, Christopher. "Analog-to-digital conversion via time-mode signal processing." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18669.
Les convertisseurs conventionnels pour changer la tension analogique à une tension numérique emploient les amplificateurs de tension, les comparateurs de tension, et les résaux de condensateur sélectionable pour acquir leur traitement de signal. En comparaison le circuit des modules analogues vis-à-vis le circuit numérique nous constatons une augmentation de puissance, une superficie de silicium moins compacte, et un traitement de données beaucoup plus lent. Une méthodologie est proposée pour le traitement du signal qui établi la conversion analogue à numérique sur les signaux de tension et tout en mettant en oeuvre tous les circuits dans un format numérique de type circuit à semiconducteur oxyde-métal à symétrie complémentaire (CMOS). Cette méthodologie reconnue sur le nom de technique-temporelle donne un traitement de signal par domaine temporel en employant la variance de cadence entre les temps comme un signal intermédiare entre la tension d'entrée et la tension de sortie numérique. Les formats numériques de type circuit semiconducteur nous offrent une alternative en temps convertisseur d'analogue à numérique avec l'avantage d'une unité compact, robuste, un coût de puissance réduit, et une haute-vitesse efficace. Il existe cinq topologies principales dans les convertisseurs analogiques à numérique: flash, approximations successives, pipeline, delta-sigma, convertisseurs intégrés. Dans chacune des topologies mentionnées ci-dessus, le traitement de signal par technique-temporelle est une méthode réconnue. Les circuits employés par chaque convertisseur de donnée par technique temporelle sont décrits lorsque le niveau du système est approprié, le niveau du transitor, et les données expérimentales sont identifiés. Trois circuits intégrés (CI) ont été conçus et fabriqués, avec une technologie de 0,18-µm CMOS pour démontrer la possibilité de la méthodologie du techniquetemporelle convertisseur analogique-numéri
Parisot, Alexandre 1979. "Mode conversion current drive experiments on Alcator C-Mod." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40505.
Includes bibliographical references (p. 189-197).
In tokamak plasmas with multiple ion species, fast magnetosonic waves (FW) in the Ion Cyclotron Range of Frequency can mode convert to shorter wavelength modes at the Ion-Ion hybrid layer, leading to localized electron heating and current drive. Due to k1l upshifts associated with the poloidal magnetic field, only small net driven currents were predicted from mode converted Ion Bernstein Waves (IBW). As studied first by Perkins, and later confirmed experimentally with Phase Contrast Imaging measurements on Alcator C-Mod, poloidal field effects can also lead to mode conversion to Ion Cyclotron Waves (MCICW), on the low field side of the mode conversion layer. In this thesis, mode conversion current drive in the ICW-dominated regime is studied numerically and through experiments on Alcator C-Mod. Solving a dispersion relation for the mode converted waves in a slab geometry relevant to tokamak equilibria and in the finite Larmor radius limit, we find that mode conversion to Ion Cyclotron Waves is ubiquitous to high temperature conventional tokamaks, as a result of the central value for the safety factor qo 1. MCICWs are identified as kinetically modified Ion Cyclotron Waves in the regime w/kllVthe < 1. Full wave simulations with the TORIC code predict net currents can be driven by MCICW as a result of up-down asymmetries in the mode conversion process. Initial estimates with the Ehst-Karney parametrization indicated up to -- 100 kA could be driven for 3 MW input power in C-Mod plasmas. More accurate calculations, consistent with the polarization of MCICWs, were carried out by importing a quasilinear diffusion operator build from the TORIC fields in the Fokker-Planck code DKE, and predicted lower current drive efficiencies by a factor of 2.
(cont.) The TFTR discharges in 1996 where net MCCD currents were inferred experimentally from loop voltage differences were simulated with TORIC, which indicates mode conversion to ICW can account for the driven currents. Similar loop voltage experiments in D(3He) plasmas were attempted on Alcator C-Mod, but did not yield conclusive current drive measurements. The lack of control over Zeff in C-Mod, which is illustrative of ICRF operation in tokamaks with metallic walls, makes reaching optimal plasma conditions for MCCD difficult, and limits the range of parameters in which MCCD can be useful as a net current drive tool in C-Mod. Solving the current diffusion equation in the cylindrical limit and with sawtooth reconnection models, the large sawtooth oscillations in C-Mod plasmas were also found to complicate current relaxation and hinder the loop voltage analysis for small central driven currents inside the q = 1 surface. In separate experiments on Alcator C-Mod, sawtooth period changes were used to infer localized MCCD near the q = 1 surface. The mode conversion layer was swept outward through the q = 1 surface in D(3He) plasmas, and the sawtooth period was found to vary from 3 to 12 ms, which is consistent wih localized current drive and TORIC predictions. A similar evolution was found in heating and co-current drive phasing, which suggests net currents are driven with a symmetric antenna spectrum, as predicted by TORIC as a result of asymmetries in the mode conversion process. Simulations of the sawtooth cycle with the Porcelli trigger model indicate that TORIC currents can account for the sawtooth period evolution in heating phasing.
(cont.) Based on simulations of the saw-tooth cycle with the Porcelli trigger model, localized electron heating, which could also explain the experimental results, was found not to be dominant compared to the current drive effect. The experimental results demonstrate that, while not optimal, MCCD can be used for sawtooth control.
by Alexandre Parisot.
Ph.D.
Freethy, Simon. "Synthetic aperture imaging of B-X-O mode conversion." Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/2352/.
Johnston, David Gregory. "A global normal form for two-dimensional mode conversion." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639767.
Midha, Amit. "Conversion of 2-dimensional drawings into 3-dimensional solid model." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183733016.
Siddique, Zahed. "Conversion of CAD model data for virtual prototypes for disassembly." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17877.
Cummings, Jeremy P. "Spiritual Identity Formation: Testing a Model of Religious Conversion Processes." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1321191940.
Holland, Troy Michael. "A Comprehensive Coal Conversion Model Extended to Oxy-Coal Conditions." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6525.
Youngsman, John M'Kay. "An extensional mode resonator for vibration harvesting." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Spring2009/j_youngsman_042109.pdf.
Title from PDF title page (viewed on Apr. 19, 2010). "College of Engineering and Architecture." Includes bibliographical references (p. 113-116).
Dombek, Priscilla Emily 1961. "IMPROVING THE CONVERSION OF THE SULFUR DIOXIDE - LIME REACTION BY USING ADDITIVES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291523.
Bogan, Christina [Verfasser]. "Stabilized High Power Lasers and Spatial Mode Conversion / Christina Bogan." München : Verlag Dr. Hut, 2013. http://d-nb.info/1033041505/34.
Silva, Alexandre Herculano Mendes. "Pipelined analog-to-digital conversion using current-mode reference shifting." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8265.
Pipeline Analog-to-digital converters (ADCs) are the most popular architecture for high-speed medium-to-high resolution applications. A fundamental, but often unreferenced building block of pipeline ADCs are the reference voltage circuits. They are required to maintain a stable reference with low output impedance to drive large internal switched capacitor loads quickly. Achieving this usually leads to a scheme that consumes a large portion of the overall power and area. A review of the literature shows that the required stable reference can be achieved with either on-chip buffering or with large off-chip decoupling capacitors. On-chip buffering is ideal for system integration but requires a high speed buffer with high power dissipation. The use of a reference with off-chip decoupling results in significant power savings but increases the pads of chip, the count of external components and the overall system cost. Moreover the amount of ringing on the internal reference voltage caused by the series inductance of the package makes this solution not viable for high speed ADCs. To address this challenge, a pipeline ADC employing a multiplying digital-to-analog converter (MDAC) with current-mode reference shifting is presented. Consequently, no reference voltages and, therefore, no voltage buffers are necessary. The bias currents are generated on-chip by a reference current generator that dissipates low power. The proposed ADC is designed in a 65 nm CMOS technology and operates at sampling rates ranging from 10 to 80 MS/s. At 40 MS/s the ADC dissipates 10.8 mW from a 1.2 V power supply and achieves an SNDR of 57.2 dB and a THD of -68 dB, corresponding to an ENOB of 9.2 bit. The corresponding figure of merit is 460 fJ/step.
Carpintero, Moreno Efrain. "Wave energy conversion based on multi-mode line absorbing systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/wave-energy-conversion-based-on-multimode-line-absorbing-systems(dc39c038-c89e-4243-be4c-062a6e27be5b).html.
Uwaha, Makio. "Simple Models for Chirality Conversion of Crystals and Molecules by Grinding." The Physical Society of Japan, 2008. http://hdl.handle.net/2237/13865.
Johannesson, Elin. "A model for heterogenic catalytic conversion of carbon dioxide to methanol." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167498.