Дисертації з теми "Maximum Tension"
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Phung, Kent, and Charles Chu. "Adhesives for Load-Bearing Timber-Glass Elements : Elastic, plastic and time dependent properties." Thesis, Linnéuniversitetet, Institutionen för bygg- och energiteknik (BE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27386.
Повний текст джерелаКучірка, Ю. М. "Удосконалені методи підвищення точності результатів дослідження поверхневого натягу рідин та пристрій для їх реалізації". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2013. http://elar.nung.edu.ua/handle/123456789/4629.
Повний текст джерелаДиссертация посвящена разработке усовершенствованных методов и устройства по их реализации для автоматизированного исследования поверхностного натяжения (ПН) жидкостей и растворов ПАВ на границе жидкость - газ с использованием трех зафиксированных между собой капилляров с различными внутренними радиусами и расстоянием между их нижними торцами. В первом разделе осуществлена оценка экспериментальных условий проведения исследования ПН однокомпонентных жидкостей, промышленных растворов ПАВ и биологических жидкостей человека, проанализированы известные методы и приборы для измерения ПН жидкостей и растворов ПАВ за максимальным давлением в пузырьке. Определены их недостатки, сформулированы задачи и направления по их усовершенствованию. Во втором разделе представлены усовершенствованные методы определения равновесного (РПН) и динамического (ДПН) ПН жидкостей и растворов ПАВ, учитывающие отклонения поверхности мениска от полусферической формы в момент максимального давления в пузырьке, которые не требуют предварительного определения плотности жидкости и прецизионной системы погружения капилляров на заданную глубину жидкости, а также методики, которые повышают точность определения РПН и ДПН жидкостей и растворов ПАВ. В третьем разделе описаны требования к устройству с целью реализации им разработанных методов определения ПН жидкостей и растворов ПАВ, а также структурная, функциональная, электрическая, пневматическая схемы, конструкция и программное обеспечение трикапилярного устройства для автоматизированного исследования РПН и ДПН жидкостей и растворов ПАВ. Четвертый раздел посвящен метрологическому анализу погрешностей предложеных методов определения РПН и ДПН жидкостей и растворов ПАВ, а также трикапилярного устройства. Показано, что граничная погрешность определения этим устройством РПН и ДПН жидкостей и растворов ПАВ составит 0,45 ÷ 0,6 мН/м для значений ПН в интервале от 10 до 100 мН/м. В пятом разделе разработана процедура проведения лабораторных испытаний трикапилярного устройства, приведены результаты лабораторных и натурных испытаний, а также выводы, которые были получены при их анализе.
Dissertation is dedicated to research and development of measurement of surface tension at the boundary of contact of fluid and gas and the device, that realizes developed improved methods by using of maximum pressure in the bubble. The known methods of measuring of surface tension of fluids and surfactants solutions by using of maximum pressure in the bubble are analyzed, their merits and demerits are determined. Presented improved methods that take into account deviations from hemispherical surface meniscus forms at the moment of the maximum pressure in the bubble and do not require prior density measurement of liquids and precision system for capillary immersion at a certain depth of fluid and the device with their implementation, allowing automatically investigate surface tension liquids by using of maximum pressure in the bubble.
Ndoye, Mamadou Mustapha. "Contribution à l'étude du transistor bipolaire hyperfréquence sur puce de silicium." Bordeaux 1, 1997. http://www.theses.fr/1997BOR10682.
Повний текст джерелаThis work is a contribution to the study of the high-speed bipolar transistor on silicon chip. First, it presents two original methods allowing to reduce the Base-Collector extrinsic Capacitance, to increase the Base-Collector breakdown voltage, to increase the Voltage Early VA, to increase the maximum power gain Gpmax and to increase the transition frequency FT. Then, it presents a new transistor, hybrid structure between the vertical NPN and the lateral NPN, named bipolar-CLEV (lateral collector-vertical emitter). This study can be generalized to other high speed transistor technologies such as III-V substrate transistors or heterojunction transistors
Ortiz, Thomas. "Two dimensional Maximal Supergravity, Consistent Truncations and Holography." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2014. http://tel.archives-ouvertes.fr/tel-01070735.
Повний текст джерелаPereira, Claudia Cristina. "Um estudo do metodo da continuação aplicado a analise do maximo carregamento dos sistemas de potencia." reponame:Repositório Institucional da UFSC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77439.
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Este trabalho aborda o problema de determinação do máximo carregamento de um sistema de potência, sob o ponto de vista de análise da estabilidade de tensão. A operação da rede elétrica em condições limite no que diz respeito à capacidade dos equipamentos, tem exigido o desenvolvimento de métodos adequados tanto para a determinação da solução das equações do fluxo de potência no ponto de máxima demanda, como para a detecção da proximidade do ponto crítico sob o aspecto de estabilidade de tensão. Apresenta-se a aplicação do Método da Continuação ao problema de determinação da maxima demanda da rede elétrica. Este método pode ser formulado em coordenadas polares e em coordenadas retangulares. Uma metodologia baseada na modelagem em coordenadas retangulares é mostrada, em duas versões diferentes no que diz respeito ao etapa de correção do Método da Continuação. Os resultados da aplicação da metodologia a sistemas de variados portes ilustram a potencialidade da abordagem baseada no Método da Continuação para a detecção e identificacão de áreas sujeitas ao colapso de tensão, em estudos de planejamento e operação.
Llacua, Zarate Luis Alberto. "Estimação rapida do ponto de maximo carregamento para a analise de estabilidade de tensão de sistemas eletricos de potencia." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260236.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: o objetivo deste trabalho de pesquisa é propor metodologias para a estimação do ponto de máximo carregamento (PMC) de sistemas elétricos de potência com vistas à análise de estabilidade de tensão. A principal característica dos métodos propostos é a extrema rapidez de cálculo com a manutenção da precisão dos resultados. São utilizadas ferramentas de análise apropriadas que, devidamente combinadas e integralizadas, produzem os resultados esperados. Dentre elas, pode-se citar a análise de sensibilidade, análise de sistemas de equações mal condicionadas e/ou sem solução, e técnicas de otimização. Os métodos essencialmente com enfoque estático, baseiam-se em realizar um certo número de cálculos de fluxo de carga para diferentes níveis de carga no espaço de parâmetros. Assim, o caminho com direção ao PMC é baseado em simples processos de incrementos de carga e cortes de carga, que serão detalhados nos capítulos respectivos. Ressalta-se que dois métodos são presentados, com características bem diferentes em relação ao processo de incrementos de carga com direção ao PMC. A similaridade é apresentada apenas no processo de recuperação da factibilidade. Espera-se que as metodologia que resultem deste trabalho de pesquisa possam ser utilizadas de forma rotineira na análise de estabilidade de tensão de redes elétricas durante o planejamento da operação e, potencialmente, em ambientes cujas restrições de esforço computacional sejam ainda mais severas, como em ambientes de operação e análise em tempo real
Abstract: The goal of this research work is to propose methodologies for estimating the maximum loading point (MLP) of power systems for voltage stability analysis. The main feature of the proposed methods is the fast computation of MLP, while maintaining the precision of the results. Appropriate analysis tools are integrated to provide the expected results. Among them, are can mention sensitivity analysis, ill-conditioned and/or infeasible system analysis and optimization techniques. The proposed methods, with a static approach, is based on solving a certain number of load flow calculations for different load levels. Therefore, the path toward MLP is based on simple load increments or curtailments. It must be emphasized that two methods will be presented, with different characteristics with respect to the load increment processo Moreover, they are similar with respect to the feasibility restoration processo It is expected that the proposed methods can be routinely used in power systems voltage stability analysis in operation planning and potentially in enviroments with severe computational effort constraints, such as in real time operation
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
Souza, Tiago de Jesus. "Previsão da curva tensão-recalque em solos tropicais arenosos a partir de ensaios de cone sísmico." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-25042012-163755/.
Повний текст джерелаIt is presented in this dissertation the use of a method for predicting the stress-settlement curve of shallow foundations on tropical sandy soils based on seismic cone (SCPT) test results. The studied sites were the experimental research sites from USP - São Carlos, and UNESP - Bauru, Brazil, where there are results from plate load tests conducted at various depths, as well as SCPT test results. The stress-settlement curve predictions show good results, after adjusting the parameters f and g, because the estimated curves were close to those obtained from plate load tests, to depths greater than 1.5 meters. The applicability of the method, after its adjustment, to reproduce the stress-settlement curve for this type of soil, was verified employing a more rational approach with less reliance on empirical correlations. It is highlighted in this research that there is variability on SCPT and plate load test results, which is related to the change in soil suction. It was also possible to access the variability on the prediction for the USP São Carlos site, since there is a greater number of in situ and plate load tests in this site.
Romanello, Michael T. "Load Response Analysis of the WAY-30 Test Pavements: US Route 30, Wayne County, Ohio." Ohio : Ohio University, 2007. http://www.ohiolink.edu/etd/view.cgi?ohiou1196092689.
Повний текст джерелаZeferino, Cristiane Lionço. "Estudo do máximo carregamento em sistemas de energia elétrica via método da barreira modificada." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-08032007-113530/.
Повний текст джерелаIn this work the modified barrier Lagrangian function (MBLF) method, a variant of the interior point method. The formulation of the problem will have as constraints of equality the power system swinging equations, in a parametrized form, and as inequality constraints the voltage limits in the buses and the reactive generation limits in the buses with reactive control. The results found with the static optimization technique used in this study are confronted with the results obtained with the primal-dual barrier logarithmic method. The performance of the method is illustrated using as pattern the systems IEEE 14, 57 and 118 bars. The tests demonstrated the robustness and the efficiency of the proposed algorithm.
Attia, Sid Ahmed. "Sur la commande des systèmes non linéaires à dynamique hybride." Phd thesis, Grenoble INPG, 2005. http://tel.archives-ouvertes.fr/tel-00082495.
Повний текст джерелаhybrid switched systems. A diverse number of applications from automotive industry, fluid dyna-
mics and power systems are treated. Some general open loop optimal and predictive control schemes
are proposed. The main motivation behind each method is the reduction of the combinatorics. In
this thesis, two main contributions can be distinguished. The first one concerns the optimal control
of switched nonlinear systems where an algorithm based on strong variations is proposed and some
convergence results proven. The complexity of the scheme is linear in the number of locations, this
in conjunction with its simplicity makes it attractive for large scale systems. An example from
the automotive industry is treated to further illustrate the tractability of the scheme. The second
contribution concerns the development of a hierarchical approach for switched nonlinear systems.
At the lower level, feedback controllers are associated to each location and at the higher level a
predictive approach with a reduced order parametrization is in force. Based on this methodology,
two schemes are developed and successfully tested in respectively fluid stabilisation by actuator
switching and voltage stabilization in power systems.
Bonini, Neto Alfredo [UNESP]. "Técnicas de parametrização geométrica para o método da continuação." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/100307.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Este trabalho analisa a utilização de técnicas de parametrização global para o fluxo de carga continuado. Essas técnicas são consideradas inadequadas para a obtenção da margem de carregamento de sistemas com problemas de estabilidade de tensão com características fortemente locais. Isto se deve ao fato de que no ponto de máximo carregamento a singularidade da matriz Jacobiana do método de parametrização global coincide com a da matriz Jacobiana do fluxo de carga. Nesses casos, a parametrização local é considerada como a única forma de se eliminar a singularidade. Entretanto, este trabalho mostra que a singularidade também pode ser eficientemente eliminada não só para estes sistemas, mas para qualquer outro, através de uma nova técnica de parametrização (global). A técnica utiliza a equação de uma reta que passa por um ponto no plano determinado pelas variáveis fator de carregamento e a somatória das magnitudes, ou dos ângulos, das tensões nodais de todas as barras do sistema, que são as variáveis comumente usadas pelas técnicas de parametrização global. Os resultados obtidos para diversos sistemas confirmam o aumento da eficiência dos métodos propostos e mostram sua viabilidade para aplicações no planejamento da operação nos atuais sistemas de gerenciamento de energia
This work presents an analysis of the use of global parameterization techniques to the continuation power flow. Those techniques are considered inadequate for computation of the loading margin of power systems characterized by strong local static voltage stability. In such systems, at maximum loading point, the singularity of the Jacobian matrices of global parameterization techniques coincide with the one of the power flow Jacobian matrix. In those cases, the local parameterization is considered as the only way to overcome the singularity. However, this paper shows that this kind of singularity can be efficiently eliminated not only for these systems, but also for all others, by a new parameterization technique (global). This technique uses the addition of a line equation, which passes through a point in the plane determined by the sum of all the bus voltage magnitudes, or angles, and loading factor variables, that are variables commonly used by global parameterization techniques. The obtained results for several systems confirm the efficiency increased of the proposed methods and show its viability for applications in the operating planning in a modern energy management system
Son, Hyeon-Dong [Verfasser], Maxim [Gutachter] Polyakov, and Hyun-Chul [Gutachter] Kim. "Parton quasi-distributions and energy-momentum tensor form factors for large Nc nucleons / Hyeon-Dong Son ; Gutachter: Maxim Polyakov, Hyun-Chul Kim ; Fakultät für Physik und Astronomie." Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1240479239/34.
Повний текст джерелаZeferino, Cristiane Lionço. "Avaliação e controle de margem de carregamento em sistemas elétricos de potência." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-05052011-091651/.
Повний текст джерелаThis work proposes the determination of the Maximum Loading Point (MLP) in electric power system via Lagrangian Modified Barrier Function (LMBF) method, a variant of Interior Point (IP). The LMBF method is also used to determine which bus, for each system, has the highest sensitivity of load factor, i.e., which bus would be the first to have load shedding in order to increase the loading margin system and thus prevent voltage collapse. To validate this approach, the Sensitivity Analysis (SA) technique was used for the confirmation of the results obtained by the LMBF method. The formulation of the problem considered the equations of power balance of the electrical system equality constraints, and the buses voltage magnitude limits, as well as the limits of reactive power control at the buses of that power inequality constraints. Case studies were conducted in a system of 3 buses and IEEE systems 14, 57, 118 and 300 buses, demonstrating the robustness and efficiency of the proposed algorithms.
Rojas, Quintero Juan Antonio. "Contribution à la manipulation dextre dynamique pour les aspects conceptuels et de commande en ligne optimale." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2284/document.
Повний текст джерелаWe focus on the design of anthropomorphous mechanical hands destined to manipulate objects in a human environment. Via the motion analysis of a reference manipulation task performed by human subjects, we propose a method to evaluate a robotic hand manipulation capacities. We demonstrate how the angular coupling between the fingers joints and the angular limits affect the hands potential to manipulate objects. We also show the influence of the wrist motions on the manipulation task. We propose a strategy to calculate the fingertip manipulation forces and dimension the fingers motors. In a second part devoted to articulated robots, we elaborate optimal control algorithms. Regarding the kinetic energy of the robot as a metric, the dynamic model is formulated tensorially in the framework of Riemannian geometry. The time discretization is based on the Hermite Finite Elements.A time integration algorithm is designed by implementing a perturbation method of the Lagrange's motion equations. Simulation examples illustrate the superconvergence of the Hermite's technique. The control criterion is selected to be coordinate free. The control equations associated with the motion equations reveal to be covariant. The suggested control method consists in minimizing the objective function corresponding to the selected invariant criterion
Silveira, Cristiano da Silva. "Estudo de máximo carregamento em sistemas de energia elétrica." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-13052003-133219/.
Повний текст джерелаThis work presents a research about the continuation method applied to the power flow problem. Voltage stability definitions and concepts are described in a way to highlight and point out the differences and the similarities among several methods used to determine the maximum loading of electrical power systems. A short description of the bifurcation theory is also presented in order to show its importance to the voltage collapse studies. A technique based on automatically controlling the step size is proposed as an innovation of the continuation method. The objective of this technique is to determine the maximum loading point without the traditional need of asking the user for the initial step size. The results compare the performance between the conventional and the new method. These methods are analyzed using IEEE test systems (14, 30, 57 and 118-bus).
Kutty, Sangeetha. "Enriching XML documents clustering by using concise structure and content." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/48326/1/Sangeetha_Kutty_Thesis.pdf.
Повний текст джерелаJedlička, František. "Rozpoznání květin v obraze." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376895.
Повний текст джерелаYe, Jian. "Régularité de l'application du transport optimal sur des variétés riemanniennes compactes." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30354.
Повний текст джерелаIn this thesis, we are concerned with the regularity of optimal transport maps on compact Riemannian manifolds. In the first chapter, we give some definitions and recall some facts in Riemannian geometry. In the second chapter, we examine the variation of the curvature on the geodesics. In the third chapter, we study the MTW tensor on compact Riemannian manifold. We show that an improved MTW condition is satisfied on nearly spherical manifold. The proof goes by a careful analysis combined with the perturbative arguments on the spheres. In the fourth chapter, we study the inverse of the Hessian matrix of the squared distance. In the fifth chapter, we prove the smoothness of the optimal transport maps on two classes of compact Riemannian manifold-nearly spherical manifolds and Riemannian products of nearly spherical manifolds. In the last chapter, we provide some perspectives about the optimal transportation in the literature
Sánchez, Malagón Josep. "Determinants genòmics de la condició física: influència del polimorfisme BDNF val66met en la recuperació cardíaca postesforç." Doctoral thesis, Universitat Ramon Llull, 2012. http://hdl.handle.net/10803/66241.
Повний текст джерелаIntroducción: El polimorfismo val66met del factor neurotrófico derivado del cerebro (BDNF: Brain Derived Neurotrophic Factor) podría ejercer un efecto regulador en el equilibrio cardíaco simpatovagal (Yang A. , Chen, Tsai, Hong, Kuo, & Yang, 2010). La recuperación cardíaca inmediatamente después del ejercicio es una función de la reactivación vagal. Durante el ejercicio el incremento de la actividad simpática i la disminución de la actividad vagal produce un incremento de la frecuencia cardíaca. La activación parasimpática parece ser que causa la desaceleración de la frecuencia cardíaca (Levy, 1971; Javorka, Zila, & Balhárek, 2002). Metodología: La muestra escogida es de estudiantes universitarios (edad, 18-35 años), 17 mujeres i 50 hombres. Todos ellos caucásicos en que 3 generaciones o más de la misma familia han vivido en la península ibérica. La frecuencia de genotipo es de val/val (n=41), val/met (n=22) y met/met (n=4), con un Hardy-Weimberg equilibrium X2 test de p = 0.65. Se les administró un test en cinta rodante con una inclinación del 3% y un incremento progresivo de la velocidad (inicio a 6 km/h y incremento de 2km/h cada 2 minutos) hasta la exhaustación, obteniéndose la frecuencia cardíaca máxima, la frecuencia cardíaca en el primer, segundo, tercer y cuarto minuto. También se registró la tensión arterial sistólica y diastólica en reposo, al acabar la prueba de esfuerzo y pasados cuatro minutos. Para este estudio se utilizó una cinta rodante Lifefitness (USA), MP100 System Hardware, AcqKnoledge Software 3.9-Windows XP, Biopac Systems (USA) and Polar T31 (Finland). Para la obtención del DNA Se utilizó el DNA testing from saliva Oragene Kit (DNA GENOTEK). Se hicieron los estudios descriptivos utilizando la media y desviación típica utilizando el programa SPSS 18 package. Resultados: La media de la frecuencia cardíaca máxima fue de 185.2 bpm. Los resultados sugieren que los sujetos sin p.val66met tienen una mejor recuperación cardíaca con 24.59 lat/min ±10.25. Durante el segundo minuto los portadores del p.val66met recuperan mejor (40.50 lat/min ±12.29). En el tercer minuto son los sujetos con p.val66met con mejor recuperación cardíaca (51.55 lat/min ±14.56). En el cuarto minuto los sujetos p.val66met recuperan mejor (66.55 bpm±10.53). En situación de reposo la tensión arterial sistólica (TAS) (123.48 mmHg±11.15) y la tensión arterial diastólica (TAD) (63.63 mmHg±7.17) es más alta en portadores de p.val66met. Al finalizar la prueba la TAS es más alta en individuos con p.val66met (213.63 mmHg±15.28) y la TAD és más alta en sujetos sin p.val66met. (44.34 mmHg±17.75). Pasados cuatro minutos los registros más altos de TAD son para los sujetos con p.val66met (169.63 mmHg±9.43) no habiendo diferencias en relación a la TAD. Este es un estudio descriptivo que necesita más investigaciones del p.val66met.
Introducció: El polimorfisme val66met del factor neurotròfic derivat del cervell (BDNF: Brain Derived Neurotrophic Factor) podria tenir un efecte regulador en l’equilibri cardíac simpatovagal (Yang A. , Chen, Tsai, Hong, Kuo, & Yang, 2010). La recuperació cardíaca després de l’exercici ésuna funció de la reactivació vagal. Durant l’exercici l’augment de l’activitat simpàtica i la disminució de l’activitat vagal provoca un increment de la freqüència cardíaca. L’activació parasimpàtica sembla ser que causa la desacceleració de la freqüència cardíaca (Levy, 1971; Javorka, Zila, & Balhárek, 2002). Metodologia: La mostra escollida és d’estudiants universitaris de nacionalitat espanyola (edat, 18-35 años), 17 dones i 50 homes. Tots ells caucàsics i tres generacions o més de la mateixa família han viscut a la península ibèrica. La freqüència de genotip era de val/val (n=41), val/met (n=22) i met/met (n=4), amb un Hardy-Weimberg equilibrium X2 test de p = 0.65. Es va administrar un test amb cinta rodant amb una inclinació del 3% i un incriment progressiu de la velocitat (inici a 6 km/h y augment de 2km/h cada 2 minuts) fins a la exhaustació, obtenint la freqüència cardíaca màxima, la freqüència cardíaca inmediata durant el primer, segon, tercer i quart minut. També es va enregistrar la tensió arterial sistòlica i la diastòlica en repòs, en acabar la prova d’esforç i passats quatre minuts. Per a realitzar aquest estudi es va utilitzar cinta rodant Lifefitness (USA), MP100 System Hardware, AcqKnoledge Software 3.9-Windows XP, Biopac Systems (USA) and Polar T31 (Finland). Les mostres de DNA es vang obtenir amb DNA testing from saliva Oragene Kit (DNA GENOTEK). Els estudis descriptius es van fer utilitzant la mitjana i la desviació estàndard fent servir el programa SPSS 18 package. Resultats: La mitjana de freqüència cardíaca màxima va ser de 185.2 bpm. Els resultats suggereixen que els subjectes sense p.val66met tenen una millor recuperació cardíaca amb 24.59 bpm ±10.25. Durant el segon minut els portadors del p.val66met recuperen millor (40.50 bpm±12.29). En el tercer minut son els subjectes amb p.val66met els que recuperen millor (51.55 bpm±14.56). En el quart minut els subjectes amb p.val66met recuperen millor (66.55 bpm±10.53). Pel que fa a la situació de repòs la tensió arterial sistòlica (TAS) (123.48mmHg±11.15) i la tensió arterial diastòlica (TAD) (63.63 mmHg±7.17) és més alta en portadors de p.val66met. En finalitzar la prova la TAS és més alta en individus amb p.val66met (213.63 mmHg±15.28) i la TAD més alta en subjectes sense p.val66met (44.34 mmHg±17.75). Passats quatre minuts els registres més alts de TAD són per a subjectes amb p.val66met (169.63 mmHg±9.43). No es detecten diferències en relació a la TAD. Aquest és un estudi descriptiu que necessita més recerques al voltant del p.val66met.
Wouts, Marc. "Le modèle d'Ising dilué : coexistence de phases à l'équilibre & dynamique dans la région de transition de phase." Phd thesis, Université Paris-Diderot - Paris VII, 2007. http://tel.archives-ouvertes.fr/tel-00272899.
Повний текст джерелаLa thèse comporte quatre chapitres. Dans un premier chapitre, nous adaptons les travaux de Pisztora au cas du milieu aléatoire et établissons une procédure de renormalisation compatible avec la dilution. Dans un second chapitre, nous étudions en détail la tension superficielle de ce modèle, pour la mesure de Gibbs correspondant à un milieu fixé, et pour la mesure moyennée. Nous caractérisons la limite à basse température de chacune de ces quantités et décrivons les formes des cristaux correspondants. Nous montrons que les déviations inférieures de la tension superficielle ont un coût surfacique et donnons une borne inférieure sur la fonction de taux à l'aide de méthodes de concentration de la mesure. Dans un troisième chapitre, nous décrivons le phénomène de coexistence de phases, sous la mesure Gibbs et sous la mesure moyennée. Dans un quatrième et dernier chapitre, nous concluons la thèse avec une application à la dynamique de Glauber, et montrons que l'autocorrélation décroît au plus vite comme une puissance inverse du temps.
Ghrissi, Amina. "Ablation par catheter de fibrillation atriale persistante guidée par dispersion spatiotemporelle d’électrogrammes : Identification automatique basée sur l’apprentissage statistique." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4026.
Повний текст джерелаCatheter ablation is increasingly used to treat atrial fibrillation (AF), the most common sustained cardiac arrhythmia encountered in clinical practice. A recent patient-tailored AF ablation therapy, giving 95% of procedural success rate, is based on the use of a multipolar mapping catheter called PentaRay. It targets areas of spatiotemporal dispersion (STD) in the atria as potential AF drivers. STD stands for a delay of the cardiac activation observed in intracardiac electrograms (EGMs) across contiguous leads.In practice, interventional cardiologists localize STD sites visually using the PentaRay multipolar mapping catheter. This thesis aims to automatically characterize and identify ablation sites in STD-based ablation of persistent AF using machine learning (ML) including deep learning (DL) techniques. In the first part, EGM recordings are classified into STD vs. non-STD groups. However, highly imbalanced dataset ratio hampers the classification performance. We tackle this issue by using adapted data augmentation techniques that help achieve good classification. The overall performance is high with values of accuracy and AUC around 90%. First, two approaches are benchmarked, feature engineering and automatic feature extraction from a time series, called maximal voltage absolute values at any of the bipoles (VAVp). Statistical features are extracted and fed to ML classifiers but no important dissimilarity is obtained between STD and non-STD categories. Results show that the supervised classification of raw VAVp time series itself into the same categories is promising with values of accuracy, AUC, sensi-tivity and specificity around 90%. Second, the classification of raw multichannel EGM recordings is performed. Shallow convolutional arithmetic circuits are investigated for their promising theoretical interest but experimental results on synthetic data are unsuccessful. Then, we move forward to more conventional supervised ML tools. We design a selection of data representations adapted to different ML and DL models, and benchmark their performance in terms of classification and computational cost. Transfer learning is also assessed. The best performance is achieved with a convolutional neural network (CNN) model for classifying raw EGM matrices. The average performance over cross-validation reaches 94% of accuracy and AUC added to an F1-score of 60%. In the second part, EGM recordings acquired during mapping are labeled ablated vs. non-ablated according to their proximity to the ablation sites then classified into the same categories. STD labels, previously defined by interventional cardiologists at the ablation procedure, are also aggregated as a prior probability in the classification task.Classification results on the test set show that a shallow CNN gives the best performance with an F1-score of 76%. Aggregating STD label does not help improve the model’s performance. Overall, this work is among the first attempts at the application of statistical analysis and ML tools to automatically identify successful ablation areas in STD-based ablation. By providing interventional cardiologists with a real-time objective measure of STD, the proposed solution offers the potential to improve the efficiency and effectiveness of this fully patient-tailored catheter ablation approach for treating persistent AF
MEDEIROS, Rex Antonio da Costa. "Zero-Error capacity of quantum channels." Universidade Federal de Campina Grande, 2008. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1320.
Повний текст джерелаMade available in DSpace on 2018-08-01T21:11:37Z (GMT). No. of bitstreams: 1 REX ANTONIO DA COSTA MEDEIROS - TESE PPGEE 2008..pdf: 1089371 bytes, checksum: ea0c95501b938e0d466779a06faaa4f6 (MD5) Previous issue date: 2008-05-09
Nesta tese, a capacidade erro-zero de canais discretos sem memória é generalizada para canais quânticos. Uma nova capacidade para a transmissão de informação clássica através de canais quânticos é proposta. A capacidade erro-zero de canais quânticos (CEZQ) é definida como sendo a máxima quantidade de informação por uso do canal que pode ser enviada através de um canal quântico ruidoso, considerando uma probabilidade de erro igual a zero. O protocolo de comunicação restringe palavras-código a produtos tensoriais de estados quânticos de entrada, enquanto que medições coletivas entre várias saídas do canal são permitidas. Portanto, o protocolo empregado é similar ao protocolo de Holevo-Schumacher-Westmoreland. O problema de encontrar a CEZQ é reformulado usando elementos da teoria de grafos. Esta definição equivalente é usada para demonstrar propriedades de famílias de estados quânticos e medições que atingem a CEZQ. É mostrado que a capacidade de um canal quântico num espaço de Hilbert de dimensão d pode sempre ser alcançada usando famílias compostas de, no máximo,d estados puros. Com relação às medições, demonstra-se que medições coletivas de von Neumann são necessárias e suficientes para alcançar a capacidade. É discutido se a CEZQ é uma generalização não trivial da capacidade erro-zero clássica. O termo não trivial refere-se a existência de canais quânticos para os quais a CEZQ só pode ser alcançada através de famílias de estados quânticos não-ortogonais e usando códigos de comprimento maior ou igual a dois. É investigada a CEZQ de alguns canais quânticos. É mostrado que o problema de calcular a CEZQ de canais clássicos-quânticos é puramente clássico. Em particular, é exibido um canal quântico para o qual conjectura-se que a CEZQ só pode ser alcançada usando uma família de estados quânticos não-ortogonais. Se a conjectura é verdadeira, é possível calcular o valor exato da capacidade e construir um código de bloco quântico que alcança a capacidade. Finalmente, é demonstrado que a CEZQ é limitada superiormente pela capacidade de Holevo-Schumacher-Westmoreland.
Tang, Herbert Hoi Chi. "Bayesian Analysis of Intratumoural Oxygen Data." Thesis, 2009. http://hdl.handle.net/10012/4643.
Повний текст джерелаCarvalho, Thiago Cardoso. "Development of an inhalational formulation of Coenzyme Q₁₀ to treat lung malignancies." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4798.
Повний текст джерелаFu, Huang,Jun, and 黃俊夫. "The Use of Surfactants with High Electrolyte Tolerance for Ulttralow Interfacial Tension and Maximun Solubilization Processes." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/55244249809498955750.
Повний текст джерелаЛинник, Дмитро Олександрович. "Дослідження та розробка пристрою для керування потужністю фотоелектричних систем". Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/4870.
Повний текст джерелаUA : Розроблений пристрій для керування потужністю фотоелектричних систем, що має високу енергоефективність.
EN : The device for the photoelectric system’s capacity control, which has a high energetic efficiency, is developed.
Pilote, Bruno. "Relation entre une réponse inappropriée de la tension artérielle lors d'une épreuve d'effort maximal au tapis roulant et le monitorage de la tension artérielle ambulatoire chez les diabétiques de type 2 /." 2004. http://proquest.umi.com/pqdweb?did=885673081&sid=20&Fmt=2&clientId=9268&RQT=309&VName=PQD.
Повний текст джерелаScoleri, Tony. "Fundamental numerical schemes for parameter estimation in computer vision." 2008. http://hdl.handle.net/2440/50726.
Повний текст джерелаThesis (Ph.D.) - University of Adelaide, School of Mathemtical Sciences, Discipline of Pure Mathematics, 2008
Ravele, Thakhani. "Medium term load forecasting in South Africa using Generalized Additive models with tensor product interactions." Diss., 2018. http://hdl.handle.net/11602/1165.
Повний текст джерелаDepartment of Statistics
Forecasting of electricity peak demand levels is important for decision makers in Eskom. The overall objective of this study was to develop medium term load forecasting models which will help decision makers in Eskom for planning of the operations of the utility company. The frequency table of hourly daily demands was carried out and the results show that most peak loads occur at hours 19:00 and 20:00, over the period 2009 to 2013. The study used generalised additive models with and without tensor product interactions to forecast electricity demand at 19:00 and 20:00 including daily peak electricity demand. Least absolute shrinkage and selection operator (Lasso) and Lasso via hierarchical interactions were used for variable selection to increase the model interpretability by eliminating irrelevant variables that are not associated with the response variable, this way also over tting is reduced. The parameters of the developed models were estimated using restricted maximum likelihood and penalized regression. The best models were selected based on smallest values of the Akaike information criterion (AIC), Bayesian information criterion (BIC) and Generalized cross validation (GCV) along with the highest Adjusted R2. Forecasts from best models with and without tensor product interactions were evaluated using mean absolute percentage error (MAPE), mean absolute error (MAE) and root mean square error (RMSE). Operational forecasting was proposed to forecast the demand at hour 19:00 with unknown predictor variables. Empirical results from this study show that modelling hours individually during the peak period results in more accurate peak forecasts compared to forecasting daily peak electricity demand. The performance of the proposed models for hour 19:00 were compared and the generalized additive model with tensor product interactions was found to be the best tting model.
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