Thèses sur le sujet « Modèle PIC »
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Zahri, Abdellatif. « Développement du modèle PIC-MCC 2D : application aux décharges radiofréquence ». Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1344/.
Texte intégralThe particle-in-cell method combined with the Monte Carlo techniques is a well established method for plasma modelling, and is widely used to simulate low pressure radiofrequency discharges. This technique is a simple and effective method for solving a wide variety of complex problems involving a large number of particles moving under the action of internal forces and external forces (electromagnetic fields. . . ) The purpose of our model is to understand and characterize the behaviour of low pressure plasmas in a two-dimensional geometry. We want to understand what is happening in the sheath and in particular the behaviour of the ions. In this work, we describe the PIC-MCC models and techniques needed to build such models. We chose this technique by its ability to describe correctly the plasma physics at low pressure. Indeed, this technique provides more details without any assumption on the distribution function of electrons or ions, which is far from being the case for other models including fluid models. We show some distribution functions (density and energy of charged particles, EEDF) ; the electrical characteristics of the discharge are presented. This work is part of the European project EMDPA : New Elemental and Molecular Depth Analysis of advanced materials by modulated radio frequency glow discharge time of flight mass spectrometry. This project is funded by the European Commission through the research program for technological development
Mokrani, Cyril. « Impacts de vagues déferlantes sur un obstacle vertical. Modèle théorique et calcul numérique des pics de pression ». Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3004/document.
Texte intégralNumerical simulations are performed to describe different cases of breaking wave impacts at the wave scale. The main purpose is to assess short duration pressure peak involved in impulsive loads. The academical case of a triangular wedge hitting a vertical wall allows to investigate the origin of pressure peak and connect their magnitudes to the local interface inclination. Theoretical results enable us to derive two semi-empirical laws which show that pressure peaks are very sensitive to angle variations for strong interface inclination, making thus theire assessment difficult. This result is illustrated on a breaking dam case for which mesh size has shown to have a great influence on the incident jet shape, revealing that pressure peak assessment requires to know accurately interface profile. The case of a breaking wave is treated by setting up a coupling approach (VOF / BEM). This method allows to accurately approximate the interface profile at the beginning of the breaking stage. Pressure peaks are in good agreement with the theoretical results for angles lower than 70°. Two differents types of impacts are then treated by applying results from triangular case to breaking wave jet and the influence of interface curvature on pressure peak evolution is studied
Liu, Yue. « Two Dimensional PIC/MCC Simulations of RF CCPs with a Dielectric Side Wall ». Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066338.
Texte intégralA Cartesian-coordinate two-dimensional electrostatic Particle-in-cell/Monte-Carlo Collision (PIC/MCC) plasma simulation code is presented, including a new treatment of charge balance at dielectric boundaries. It is used to simulate an Ar plasma in a symmetric radiofrequency capacitively-coupled parallel-plate reactor with a thick dielectric side-wall. The dielectric side-wall effectively shields the plasma from the enhanced electric field at the powered-grounded electrode junction, which has previously been shown to produce locally enhanced plasma density. Nevertheless, enhanced electron heating is observed in a region adjacent to the dielectric boundary, leading to maxima in ionization rate, plasma density and ion flux to the electrodes in this region. The electron heating components are derived from the PIC/MCC simulations and show that this enhanced electron heating results from increased Ohmic heating in the axial direction as the electron density decreases towards the side-wall. We investigated the validity of different analytical formulas to estimate the Ohmic heating by comparing them to the PIC results. The x component electron heating near the corners was observed at higher driving frequency, which is caused by a significant RF oscillating field in the x direction
Charly, Sigogne. « Contribution à l'analyse de l'évaluation du risque de foudroiement d'un site. Application au pic du midi de Bigorre ». Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3039/document.
Texte intégralThe main purpose of this thesis work is to estimate the risk of a structure or a site being struck by lightning. A lightning protection model was developed with the aim to calculate the impact probability on every part of a complex structure. This model is an evolution of the electrogeometric model used as a reference in the lightning protection standards. In particular it allows identifying the most vulnerable areas of the structure, regardless of the type of lightning. To this end, a statistical analysis of the detection network data was also conducted and integrated in the model to take into account the type of flash or the geographical context. In order to validate this model, it was applied to the site of the Pic du Midi de Bigorre, at the top of which several electrical and optical diagnostics were installed. This site in altitude has a relatively complex structure because of the presence of various buildings and a broadcast antenna. The experimental measurements collected on this site show that the broadcast antenna is struck almost systematically which is in line with the results provided by the model. In addition the different physical phenomena involved during a lightning strike on a structure in altitude were studied using the instrumentation developed at the top of the Pic du Midi de Bigorre: current probes, electric field sensors and video cameras. In particular the different phases of a flash were analyzed from the measurements of the electric field variations. The analysis of the latters at the storm cell scale also highlighted the fact that flashes occurring to tens of kilometers from the Pic du Midi can initiate an upward flash on the site. Finally, the lightning current shape was deduced from video recordings of a high-speed camera. Thus the polarity and the propagation direction (upward or downward) of these flashes were associated with their temporal characteristics and with the charges consumed during their development
Tavant, Antoine. « Study of the plasma/wall interaction and erosion on a plasma thruster of low power ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX085.
Texte intégralElectric propulsion systems that accelerate plasma ions are important for the success of spatial missions (GPS, weather forecast, communication, etc.).The Hall effect thruster is one of the most used and efficient technology.However, its conception and optimization is slow and costly, as key processes are still poorly understood, in particular the electron transport and the plasma-wall interaction.In order to study both phenomena, we use a bi-dimensional kinetic simulation.We showed with 2D PIC simulation results that electrons are non-local, as they are absorbed more quickly at the wall compared to the collision frequency.Consequently, we derived a non-isothermal sheath model using a polytropic state law for the electrons that describes more accurately the plasma-wall interaction.The model can be used with and without secondary electron emission.With electron emission, the sheath model can present up to three solutions, explaining the oscillations observed in the simulations.The azimuthal instability observed, responsible for the electron transport, is compared to the dispersion relation of the ion acoustic wave and the electron cyclotron drift instability.We show that, while the first linear stage of the instability is well understood, the saturated quasi-steady-state is affected by particle-wave interactions and non-linear mechanisms that are not included in the dispersion relation
Baraka, Suleiman. « Etude de l'interaction entre le vent solaire et la magnétosphère de la terre : modèle théorique et application sur l'analyse de données de l'événement du Halloween d'octobre 2003 ». Paris 6, 2007. http://www.theses.fr/2007PA066008.
Texte intégralCherkhani, Rochdi. « Simulations numériques de phénomènes non linéaires dans les systèmes faisceau d'ions-plasmas ». Nancy 1, 1993. http://www.theses.fr/1993NAN10297.
Texte intégralPebernet, Laura. « Etude d'un modèle Particle-In-Cell dans une approximation Galerkin discontinue pour les équations de Maxwell-Vlasov : recherche d'une solution hybride non conforme efficace ». Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1080/.
Texte intégralThis thesis presents the study and the development of an efficient numerical simulation's tool for the modeling of plasma/microwave interaction in an electromagnetic software based upon a Discontinuous Galerkin (DG) scheme. This work is organized following two main steps. First, we develop a Particle-In-Cell (PIC) model appropriate for DG scheme. For this, on the one hand, we propose a hyperbolic corrector method to take into account the charge conservation law and, on the other hand, we integrate physical plasma models such as high power microwave sources, emission particles surfaces and electrons beams. Then, we propose also optimal performances for the coupling of Maxwell-Vlasov equations in order to increase the efficiency and the size of the applications to treat. This leads to study a non conformal hybridization of methods to solve the Maxwell-Vlasov problem. In the first time, we work on a hybrid method between different numerical schemes to solve a 1D Maxwell problem on non conformal meshes. In the second time, we interest in a 2D TE Maxwell problem, in order to introduce a PIC model. Finally, we realise a FDTD/FDTD hybridization on two non coincident meshes for the 2D Maxwell-Vlasov system
Lutz, Mathieu. « Etude mathématique et numérique d'un modèle gyrocinétique incluant des effets électromagnétiques pour la simulation d'un plasma de Tokamak ». Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAD036/document.
Texte intégralThis thesis is devoted to the study of charged particle beams under the action of strong magnetic fields. In addition to the external magnetic field, each particle is submitted to an electromagnetic field created by the particles themselves. In kinetic models, the particles are represented by a distribution function f(x,v,t) solution of the Vlasov equation. To determine the electromagnetic field, this equation is coupled with the Maxwell equations or with the Poisson equation. The strong magnetic field assumption is translated by a scaling wich introduces a singular perturbation parameter 1/ε
Michel, Bertrand. « Modélisation de la production d'hydrocarbures dans un bassin pétrolier ». Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00345753.
Texte intégralBorne, Junior José Ayrton de Souza. « RASTREABILIDADE BOVINA UTILIZANDO IDENTIFICAÇÃO POR RADIOFREQUÊNCIA EM PECUÁRIA DE PRECISÃO MODELO TEÓRICO ». Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/4818.
Texte intégralEste trabalho apresenta um modelo teórico da tecnologia eletrônica aplicada à Pecuária de Precisão e transforma-se em um subsídio a mais para incrementar o uso da Agricultura de Precisão, definição que está transformando a maneira como se obtém os resultados advindos do trabalho no campo. O projeto de um sistema de identificação por radiofrequência, conhecido atualmente como RFID, a ser utilizado na identificação e rastreabilidade de gado bovino é o objetivo a ser alcançado. Procura-se inicialmente enfatizar a definição e a utilização do uso da Agricultura de Precisão como uma rotina nas atividades do campo no Brasil. Como está à atividade pecuária e a definição de Pecuária de Precisão são itens importantes para alcançar o objetivo proposto. O sistema SISBOV e a rastreabilidade são apresentados, mostrando a sua importância, mas não a sua obrigação de implantação junto aos proprietários rurais que trabalham com a criação e comercialização de gado e seus produtos cárneos. Mostra-se a definição de microprocessadores e microcontroladores, suas arquiteturas internas e todos os periféricos associados a eles e também é mostrado como a definição de sistemas embarcados tem realizado uma revolução no projeto destes. Traça-se um cenário da comercialização e uso de produtos eletrônicos na esfera comercial brasileira, indicando como o atraso no uso da tecnologia nos transforma muito mais em consumidores de produtos eletrônicos do que em formadores de tecnologia. Enfatiza-se o princípio de funcionamento de sistemas RFID e quais os protocolos de comunicação que são utilizados. O projeto do leitor RFID e a miniaturização da eletrônica possibilitou a criação de um equipamento com tecnologia de montagem em superfície diminuindo as dimensões da placa de circuito impresso e possibilitando a diminuição do custo no projeto deste sistema. Apresentam-se todos os periféricos que o compõem e a maneira como se interligam com o processador mestre, inclusive o processador escravo o qual executa as funções de entrada e saída digitais e o teclado. Protocolos de comunicação e fluxogramas evidenciam a utilização de canais conhecidos comercialmente na utilização de software. O uso da energia solar apresenta-se como uma alternativa de fornecimento de alimentação elétrica no funcionamento do equipamento leitor. O alto custo dos módulos RFID comerciais inviabilizou a parte prática do sistema.
Motta, Neto Cl?vis Coutinho da. « Haemulidae, modelo cariot?pico de estase evolutiva ». Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12497.
Texte intégralConselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
Os perciformes constituem o maior e mais diversificado grupo de peixes. Uma parcela consider?vel de suas esp?cies apresenta um marcante conservadorismo cromoss?mico exibindo um padr?o caracterizado por 2n=48a, NF=48, que tem sido apontado como uma condi??o basal para a Ordem. Blocos heterocrom?ticos reduzidos e RONs simples s?o caracter?sticos para este grupo de peixes. No entanto, n?o se encontra ainda bem estabelecido se este conservadorismo se deve, em parte, a dados provenientes de bandamentos cromoss?micos pouco resolutivos, como os convencionalmente utilizados nas caracteriza??es citogen?ticas das esp?cies marinhas ou a uma condi??o peculiar cariot?pica deste grupo. Visando clarificar os processos envolvidos no peculiar conservadorismo cromoss?mico observado nesta Ordem, cinco esp?cies da fam?lia Haemulidae foram submetidas ? variadas t?cnicas citogen?ticas como colora??o com Giemsa, bandamento C e impregna??o por nitrato de prata, bem como digest?o com enzimas de restri??o (AluI, TaqI, PstI e EcoRI), bandamento de replica??o pela incorpora??o do an?logo de base 5 BrdU, colora??o com os fluorocromos CMA3/MM e DAPI, double FISH com sondas para as subunidades ribossomais 5S e 45S, sendo tamb?m analisadas morfometricamente atrav?s de morfometria geom?trica (MG). Os dados obtidos permitiram identificar um alto grau de similaridade cariot?pica neste grupo independente do n?vel de resolu??o das t?cnicas utilizadas. As esp?cies Conodon nobilis, Pomadasys corvinaeformis, Haemulon aurolineatum, H. plumierii e H. steindachneri apresentaram uma macroestrutura cariot?pica comum composta por 2n=48a (NF=48), com RONs simples localizadas em um mesmo par cromoss?mico (24? par) nas esp?cies C. nobilis, H. aurolineatum H. plumierii e H. steindachneri e em outro par em P. corvinaeformis (18? par), considerando-se estas regi?es caracteres citotaxon?micos pouco importantes. O padr?o heterocrom?tico apresentou-se similar para todas as esp?cies, observando-se reduzidos blocos heterocrom?ticos detectados preferencialmente em regi?o centrom?ricas e em menor n?mero em regi?es pericentrom?ricas e telom?ricas. Contrastando com a reduzida diferencia??o cromoss?mica observada, as an?lises por MG indicaram uma consp?cua diferencia??o morfol?gica entre as esp?cies. Condi??es ambientais com reduzidas barreiras biogeogr?ficas, caracter?sticas biol?gicas, decorrente da presen?a de grandes contingentes populacionais uniformemente distribu?dos em largas ?reas costeiras, que promoveriam a manuten??o do fluxo g?nico dentro das popula??es, associadas ?s caracter?sticas cariot?picas peculiares, poderiam desempenhar uma a??o sin?rgica contribuindo para a evolu??o bradit?lica do cari?tipo nas esp?cies de Haemulidae
Cornieles, Ernesto. « Développement d'un module de réglage automatique d'un compensateur PID Dual Loop ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0025/NQ37375.pdf.
Texte intégralMenand, Stéphane. « Analyse et validation d'un modèle de comportement directionnel des outils de forage monobloc pdc ». Phd thesis, École Nationale Supérieure des Mines de Paris, 2001. http://pastel.archives-ouvertes.fr/pastel-00000017.
Texte intégralMouroux, Mireille. « Le PICA induit par rotation chez le rat : modèle de screening de molécules antinaupathiques ». Paris 5, 1991. http://www.theses.fr/1991PA05P150.
Texte intégralMenand, Stéphane. « Analyse et validation d'un modèle de comportement directionnel des outils de forage monoblocs PDC ». Paris, ENMP, 2001. http://www.theses.fr/2001ENMP1051.
Texte intégralVinceller, Sonia. « Effets de l'extinction thermique de la luminescence sur les phénomènes thermostimulées présentés par le pic dosimétrique de l'alumine alpha ». Toulouse 3, 2002. http://www.theses.fr/2002TOU30140.
Texte intégralDiop, Daouda. « PIB comparés des différents pays d’Europe occidentale depuis le traité de Rome (1957-2007) ». Strasbourg, 2011. https://publication-theses.unistra.fr/public/theses_doctorat/2011/DIOP_Daouda_2011.pdf.
Texte intégralThis thesis on GDP of different countries of Western Europe compared since the treaty of Rome (1957-2007) is a comparative study of economic growth among the EU 15 (and Switzerland) and United States since the beginning of unification of Europe to the subprime crisis. The research is based on the databases of university of Groningen, world bank and university of Pennsylvania. The analysis of the groxth disparities revealed two major trends : a high-growth phase (1949-1973) and a deceleration phase (1986- 2007) interrupted by a period of crisis (1973-1986). The southern European countries have experienced the fastest growth in the first phase, confirming the predominance of catch-up effect as the main factor of European dynamism before the opening of the borders. Research also shows during this period, strong growth in countries with high transfer of agricultural population (Europe of six, Austria, Finland…). The phenomenon of stagflation caused by the oil crises between 1973 and 1986 marked the end of the upturn of the "Thirty Glorious Years". The period between 1986 and 2007 reveals the persistence of the slowdown in european national economic spaces. The growth gap is widening between the U. S. And Western European countries. Only Ireland, Portugal, Luxembourg and the United Kingdom escape this relative decline. After 1986, the main engine of growth is not longer the catch-up effect nor the agricultural population transfer, but the international trade
Woicik, Richard. « A FLEXIBLE MULTIFUNCTION TELEMETRY INPUT/OUTPUT MODULE ». International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606458.
Texte intégralMany high-performance, reconfigurable data functions can now be integrated into a single PCI circuit board, making possible low-cost and complex systems using PCs or UNIX workstations. FPGA and PCI technologies are an excellent match to telemetry applications where commercial off-the-shelf solutions are desired, but customization is common and performance critical. A Multifunction Telemetry I/O (MFT) module was designed to exploit these technologies for both flight test and space telemetry ground systems. The reconfigurability of the module has facilitated evolutionary hardware enhancements as well as custom applications. These enhancements have been used both as building blocks for system integrators and for commercial-off-the-shelf (COTS) graphic setup, processing, archiving, and display software. The MFT module includes a standard set of telemetry functions: up to two bit synchronizers, an IRIG time decoder, and two independent telemetry serial input and output channels. The MFT module is also available on a 6U VME board. This paper describes some of the proven capabilities and applications of this module.
Moretti, Alex Sandro. « Um modelo de controle de dispositivos através do barramento PCI ». Florianópolis, SC, 2003. http://repositorio.ufsc.br/xmlui/handle/123456789/84703.
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Este trabalho é direcionado ao desenvolvimento de um protocolo PCI, o qual foi aqui denominado, Core PCI. O Core PCI é um núcleo que contém os controles básicos de acesso a um dispositivo PCI de 32bits e 33Mhz. Ele foi desenvolvido para uso geral, por isso, somente foram implementados, os acessos a dispositivos de I/O, mapeados como RAM. Neste trabalho são descritos detalhes e características do barramento PCI, tais como: sinais do barramento, funcionamento do protocolo de transação de dados, configuração plug and play e inicialização dos dispositivos PCI no boot do computador. Também se encontram, detalhes de uma aplicação usando o Core PCI e um software de alto nível para controle da aplicação. O Core PCI foi desenvolvido em um chip FPGA, utilizando-se de uma linguagem de descrição de hardware VHDL e utilizando-se também de simuladores para o código VHDL. Ainda neste
Ntayiya, Witness Sakumzi. « Evaluating the quality of care for sexually transmitted infections (STI) in 14 primary health care (PHC) facilities in Umjindi local municipality, Mpumalanga Province ». Thesis, University of the Western Cape, 2004. http://etd.uwc.ac.za/index.php?module=etd&.
Texte intégralMotloung, Setumo Victor. « Intense pulsed neutron generation based on the principle of Plasma Immersion Ion Implantation (PI3) technique ». Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_9599_1182748458.
Texte intégralThe development of a deuterium-deuterium/ tritium-deuterium (D-D/ D-T) pulsed neutron generator based on the principle of the Plasma Immersion Ion Implantation (PI3) technique is presented, in terms of investigating development of a compact system to generate an ultra short burst of mono-energetic neutrons (of order 1010 per second) during a short period of time (<
20&mu
s) at repetition rates up to 1 kHz. The system will facilitate neutron detection techniques, such as neutron back-scattering, neutron radiography and time-of-flight activation analysis.
Aspects addressed in developing the system includes (a) characterizing the neutron spectra generated as a function of the target configuration/ design to ensure a sustained intense neutron flux for long periods of time, (b) the system was also characterised as a function of power supply operating conditions such as voltage, current, gas pressure and plasma density.
Nicolais, Ray, Stephen J. Nicolo et Ed Snyder. « HARDWARE DOWNLOADABLE MULTI-FUNCTION TELEMETRY INPUT MODULE ». International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608271.
Texte intégralThis paper describes a Multi-Function Telemetry Input Module (TIM). The TIM module includes a 30 Mbps PCM frame synchronizer, a time code translator/generator, a PCM simulator and a tunable bit synchronizer all on a single PCI card. The module uses a generic architecture including: high density Field Programmable Gate Arrays (FPGAs), look-up table memory, dual port A/B data buffer memory and a full function PCI interface. The FPGA and the logic function of the card are downloadable via the PCI interface. This allows a single module to support many hardware functions in a telemetry front-end. The TIM is an integral part of a PC-based Advanced Telemetry Processing and Display System. This concept for hardware design ushers in a new generation of flexible downloadable telemetry products.
Gauthier, Thierry. « Etude des mécanismes d'actions de SuperMApo dans un modèle de sclérose en plaques ». Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCE010/document.
Texte intégralMultiple sclerosis (MS) is an autoimmune disease notably delined bv a default of mechanisms of tissue reparation which are insufficient to establish homeostasis. The active resolution of innammation mediated by macrophage effcrocytosis of apoptotic cells has emerged to propose a new branch of pharmacology named "resolution pharmacology". ln this study. we propose to resolve innammation in a murine model of MS. using the supermatanl issued from the culture between apoptotic cells and macrophages. inducing efferocytosis and the production of pro-resolutive factors (SuperMApo). Here. we demonstrate that injection of SupcrMApo in a model of MS allow the control of the disease correlated with a reduction of the inflammatory inliltrate in the central nervous system. The control of the disease is associated with a reprograrnming of macrophages and pDC, but not cDC, in the spleen, demonstrated by a higher capacity to generate Treg and a lower ability to generate Th 1, and their presence is necessary to the anti-innammatory effect of SupcrMApo. Reprogramming of macrophages and pDC occurs at two main levels. First. an epigenetic control of gene expression induces a modulation of global DNA methylation and a modulation of DNA methylation at the promoter of miRNA implicated in the regulation of immune responses. Secondly, a decreased activation of NFκB activation pathway is observed resulting to a decreased activation of these cells. Thus, this work demonstrates that targeting the resolution of inflammation is an interesting strategy to treat MS
Mazzag, Barbara Cathrine. « Mathematical models in biology / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Texte intégralUhl, Juli D. « Hox Specificity : Constrained vs. Flexible Requirements for the PBC and MEIS Cofactors ». University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397234792.
Texte intégralChoe, Kyung-Il. « Aisle-based order pick systems with batching, zoning, and sorting ». Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/25429.
Texte intégralGramacy, Robert B. « Bayesian treed Gaussian process models / ». Diss., Digital Dissertations Database. Restricted to UC campuses, 2005. http://uclibs.org/PID/11984.
Texte intégralChuenpibal, Tanitpong. « If I pick up non-normality, can robust models make it better ? » Thesis, University of Exeter, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434877.
Texte intégralGavin, Gérald Zighed Djamel Abdelkader. « Etude du modèle d'apprentissage Probablement Approximativement Correct (PAC) application aux méthodes d'agrégation / ». [S.l.] : [s.n.], 2001. http://theses.univ-lyon2.fr/Theses2001/gavin_g/these.pdf.
Texte intégralSeeger, Matthias. « Bayesian Gaussian process models : PAC-Bayesian generalisation error bounds and sparse approximations ». Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/321.
Texte intégralFerreira, Roberto Tatiwa. « Forecasting quarterly brazilian GDP growth rate with linear and non linear diffusion inex models ». reponame:Repositório Institucional da UFC, 2005. http://www.repositorio.ufc.br/handle/riufc/659.
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The present study uses linear and non-linear diffusion index models to produce one-step-ahead forecast of quarterly Brazilian GDP growth rate. Diffusion index models are like dynamic factors models. These factors are latent variables that represent a common property from the explanatory variables, then allowing a considerably reduction of its number in econometric models elaborated to attend the main objective of this work. The non-linear diffusion index models used in this thesis are not only parsimonious ones, but also they try to capture economic cycles using for this goal a Threshold diffusion index model and a Markov-Switching diffusion index model. The former is used, besides for forecasting purpose, also to test if there is a non-linear pattern in the quarterly Brazilian GDP growth rate.
Esta Tese estuda modelos lineares e não lineares de índices de difusão para prever, em um período à frente, a taxa de crescimento trimestral do PIB brasileiro. Os modelos de índice de difusão assemelham-se aos modelos de fatores dinâmicos. Estes fatores são variáveis não observáveis e representam uma característica em comum às variáveis explicativas, permitindo a redução significativa do número dessas no modelo econométrico proposto para atender o objetivo principal deste trabalho. Além de parcimoniosos, os modelos utilizados nesta Tese se propõem a capitar as fases de recessão e expansão econômica, através de modelos não lineares do tipo Threshold Effect e Markov-Switching, servindo o primeiro destes dois para testar a hipótese de que existe não linearidades na variável sob estudo.
Baklík, Radim. « Analýza měření PID degradace FV modulů na bázi křemíku ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-319634.
Texte intégralLee, Lik Wee. « Critical behaviour of spin glass models / ». Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
Texte intégralSkordis, Constantinos. « The accelerating universe : models and consequences / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Texte intégralZhang, Chun. « Hidden Markov models for admixture mapping / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Texte intégralRodriguez, Marko A. « Models of computing in semantic networks / ». Diss., Digital Dissertations Database. Restricted to UC campuses, 2007. http://uclibs.org/PID/11984.
Texte intégralSantos, Anabela Marques. « Análise dos efeitos do programa de iniciativa comunitária LEADER na região Alentejo, entre 1991 e 2006 ». Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/14938.
Texte intégralAwasthi, Pranjal. « Approximation Algorithms and New Models for Clustering and Learning ». Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/266.
Texte intégralBandeira, Patr?cia Bock. « Motiva??es para a carreira empreendedora segundo o modelo de carreira caleidosc?pica ». Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/7831.
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This study was conducted within the Group of Studies in Career Development of the field of Social Psychology, in the Psychology Faculty of Pontif?cia Universidade Cat?lica do Rio Grande do Sul. The research?s main objective was to investigate the female entrepreneurial career in order to understand its motivations under a contemporary career model: the Kaleidoscopic Career Model. Brazil is among the top 10 countries with the highest rates of entrepreneurship in the world, with almost equivalent rates between men and women - the difference is less than 2. Although female entrepreneurship growth has been 16% in the last 10 years compared to male?s 7%, this activity is still strongly associated with male careers. In this context, the specificities of female entrepreneurship may be overshadowed, just as there is a difference between the motivations that lead women and men to open their own businesses. Therefore, the general objective of this research was to verify if there are differences between men and women regarding their motivations for entrepreneurship, according to the parameters of the Kaleidoscopic Career, theoretical model developed based on female career trajectories. To achieve this goal, a narrative review of the literature on the model was carried out, which analyzed 16 articles available in national and international scientific databases on the Kaleidoscopic Career Model, and its relation with female career trajectories. Afterwards, the first empirical study that composes this dissertation has adapted this instrument to Brazilian context within a sample of 272 Brazilian professionals. For the validation, confirmatory factorial analysis has been used, with maximum likelihood estimation method. The final version of the scale presented 19 items, distributed in the predicted factors, with precision values of: Balance (?=.78), Challenge (?=.76) and Authenticity (?=.65). Using this adapted scale, the second empirical study aimed to verify if there is difference between women?s and men?s motivation for opening their own businesses. In addition to the Kaleidoscopic Career Parameter Scale adapted to Brazilian context, a sociodemographic survey and entrepreneurial trajectory and business characteristics questionnaire were used with the respondents. The sample was composed by 416 professionals, in which 54.6% were women and 48.6% were entrepreneurs. Although professionals with their own business had significantly higher averages (M = 3.86) compared to non-entrepreneurs in Challenge parameter [M = 3.53; F (416,1) = 15.15; p <0.001, ?? = 0,4], there was no significant difference between the parameters according to respondent?s sex. Corroborating this result, the main reasons for opening a company - identification of business opportunity, desire for autonomy and work according to personal values - were the most frequently answers among male and female entrepreneurs. By contributing to demystify the idea that the motivations for female entrepreneurship are essentially different from the masculine, we expect results to contribute for a greater awareness and promotion of female entrepreneurship.
Este estudo foi realizado junto ao Grupo de Estudos em Desenvolvimento de Carreira da ?rea de concentra??o em Psicologia Social, da Faculdade de Psicologia da Pontif?cia Universidade Cat?lica do Rio Grande do Sul, e teve como principal objetivo investigar a carreira empreendedora feminina no intuito de compreender suas motiva??es ? luz de um dos modelos de carreira contempor?neos: o Modelo de Carreira Caleidosc?pica. O Brasil est? entre os 10 pa?ses com as maiores taxas de empreendedorismo do mundo, com ?ndices quase equivalentes entre homens e mulheres - a diferen?a ? inferior a 2%. Embora o crescimento do empreendedorismo feminino tenha sido de 16% nos ?ltimos 10 anos ante 7% do masculino, essa atividade ainda ? fortemente associada a carreiras masculinas. Nesse contexto, podem-se ofuscar especificidades do empreendedorismo feminino, tais como poss?veis diferen?as entre as motiva??es de mulheres e homens para empreender. Neste sentido, o objetivo geral desta pesquisa foi verificar se h? diferen?as entre homens e mulheres em rela??o ?s motiva??es para o empreendedorismo, segundo os par?metros da Carreira Caleidosc?pica, modelo te?rico desenvolvido com base nas trajet?rias de carreira femininas. Para atingir esse objetivo, realizou-se primeiramente uma revis?o narrativa da literatura sobre o modelo, que analisou 16 artigos dispon?veis em bases de dados nacionais e internacionais a respeito do Modelo de Carreira Caleidosc?pica e sua rela??o com as trajet?rias de carreira femininas. Ap?s, foi conduzido o primeiro estudo emp?rico que comp?e esta disserta??o, que adaptou o instrumento para mensura??o dos par?metros do modelo utilizando uma amostra de 272 profissionais brasileiros. Para a valida??o, realizou-se an?lises fatoriais confirmat?rias, com m?todo de estima??o da m?xima verossimilhan?a. A vers?o final apresentou 19 itens, distribu?dos nos fatores previstos, com os valores do coeficiente de precis?o: Balan?o (?=,78), Crescimento (?=,76) e Autenticidade (?=,65). Utilizando a escala adaptada, realizou-se o segundo estudo emp?rico com o objetivo de averiguar se h? e como se d? a diferen?a entre mulheres e homens ao optarem por abrir seus pr?prios neg?cios. Al?m da Escala de Par?metros da Carreira Caleidosc?pica adaptada para o contexto brasileiro, foi utilizado um question?rio sociodemogr?fico e um acerca da trajet?ria empreendedora e caracter?sticas dos neg?cios dos participantes empres?rios. Participaram desta etapa 416 profissionais maiores de idade, dos quais 54,6% mulheres e 48,6% empreendedores. Embora profissionais que possuam um neg?cio pr?prio tenham apresentado m?dias significativamente mais altas (M=3,86) em rela??o a n?o-empreendedores no par?metro Crescimento [M=3,53; F(416,1)=15,15; p<0,001, ?? = 0,4], n?o foi verificada diferen?a significativa entre os par?metros segundo o sexo. Corroborando este resultado, as principais raz?es para abertura da empresa ? identifica??o de oportunidade de neg?cio, desejo por autonomia e atua??o segundo valores pessoais ? foram as mais frequentemente citadas entre empreendedoras e empreendedores. Ao contribuir para desmistificar a ideia de que as motiva??es para o empreendedorismo feminino sejam essencialmente diferentes do masculino, espera-se ampliar a conscientiza??o sobre e a promo??o desta atividade, especialmente entre mulheres.
Bezerra, Claudionor Gomes. « Modelo de Ashkin-Teller anisotr?pico : uma abordagem por grupo de renormaliza??o ». Universidade Federal do Rio Grande do Norte, 1994. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16617.
Texte intégralCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
Estudamos as propriedades cr?ticas (diagrama de fases e classes de universalidade) do modelo de Ashkin-Teller anisotr?pico ferromagn?tico, cujo hamiltoniano ? dado por: H = -∑_(
Mokrani, Nassim. « Modélisation comportementale du système pantographe-caténaire et stratégies de commande ». Thesis, Amiens, 2015. http://www.theses.fr/2015AMIE0026.
Texte intégralThe pantograph-catenary system (PAC) is a vital link in the electrical power transmission chain to the railway electric traction motors. This system is complex due to the dynamic nature of its components, which are subject to various physical and environmental stresses. It is therefore important to model and analyze the PAC to develop appropriate methodologies for analysis, modeling and control. In this thesis, the presented work begins with a thorough study of the PAC model, taking into account the parameters and physical phenomena of the PAC. First, a mathematical model based on the Finite Elements method of the PAC system is proposed. Second, for reasons of control and regulation, we propose a simplified model that adequately represents the dynamic behavior of the system. One of our goals is to improve the contact between the pantograph head and overhead contact line in order to ensure minimum wear while having a permanent and regular power supply for high-speed trains. So the problem is to maintain a constant and regular contact force between the pantograph and the catenary, within acceptable limits and taking into account disturbances. With this in mind, we have developed robust controls to improve the contact between the pantograph and the catenary. The practical aspect of this thesis is reflected by the creation and implementation of a test bed for the pantograph-active/catenary and the development of a management and simulation software for PAC system
Levade, Thierry. « Sphingomyelinases humaines et metabolisme de la sphingomyeline : modele cellulaire en culture des maladies de niemann-pick ». Toulouse 3, 1986. http://www.theses.fr/1986TOU30167.
Texte intégralFang, Fang. « Développement et valorisation d'un modèle animal de gale sarcoptique. Evaluation de molécules acaricides ». Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC0077/document.
Texte intégralSarcoptes scabiei is an ectoparasite responsible for the emerging/re-emerging disease called scabies in humans or mange in animals. It was reported in 104 species across 27 families of domestic and wild animals. Current treatments for scabies/mange are limited and there are no efficient products for the environment control of S. scabiei. Moreover, the taxonomic status of S. scabiei is still under controversy and the question remains that whether it represents a single species or several taxa.The objectives of the thesis were to assess the susceptibility to acaricides and analyse the genetic diversity of S. scabiei from animals. In the first part of the thesis, an animal model was used to evaluate the efficacy of afoxolaner, a new acaricide from the isoaxazoline family. The primary outcome of efficacy was based on the reduction in the number of live mites counted in skin scrapings following treatment. At day 8, four afoxolaner-treated pigs (out of four) were mite-free, while mites were still found in three (out of three) ivermectin-treated pigs. All treated pigs were cured at the end of the study (day 35) and all pigs in the control group remained infected. Secondary outcomes included measures on the reduction of skin lesions and pruritus. The clinical lesions of scabies infection were allowed to disappear completely for all the pigs in the afoxolaner group but not in the ivermectin group at 14 days after the treatment. An increase of the pruritus was observed right after treatment, followed by a decrease of the pruritus score in both treated groups. The second part of the thesis was to evaluate the scabicidal effect of molecules or products using an in vitro test. A gradient of concentrations of ivermectin and moxidectin as well as 11 essential oils have been evaluated in vitro against S. scabiei. After 24h of exposure to ivermectin and moxidectin, the median lethal concentrations were 150.2±31.4 µg/mL and 608.3±88.0 µg/mL, respectively. Doses of ivermectin under 1 ng/mL and moxidectin under 10 ng/mL showed no scabicidal effect. Fumigation and contact bioassays were used for the assessment of essential oils efficacy. Among Lavandula augustifolia, Melaleuca altenifolia, Pelargonium asperum, Eucalyptus radiate, Leptospermum scoparium, Cryptomeria japonica, Citrus aurantium ssp amara and 3 other unknown oils (BOB4, BOB5, BOB9) tested with the contact bioassay, the essential oil identified as BOB4 demonstrated the best scabicidal effect (1% solution killed all the mites in 20 min). Among the 10 essential oils listed before plus Juniperus oxycedrus with the fumigation bioassay, the oil Melaleuca altenifolia demonstrated the best scabicidal effect (all the mites died in only 4 min). For environmental control of S. scabiei, the efficacy of biocides or repellents was assessed. The median survival time was calculated for permethrin (4% and 0.6%), esdepallethrin and bioresmethrin, bifenthrin, cypermethrin and imiprothrin, cyfluthrin, tetramethrin and sumithrin, DEET (25% and 50%), icaridin and IR3535. The third part of the thesis included the study of the genetic diversity of populations of S. scabiei from animals. A part of cox1 was used for phylogenetic analyses. The results showed that Sarcoptes mites from dogs seem to derive from humans
Jin, Wenlong. « Kinematic wave models of network vehicular traffic / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.
Texte intégralMainguy, Thomas. « Processus de substitution markoviens : un modèle statistique pour la linguistique ». Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066354/document.
Texte intégralThis thesis proposes a new approach to natural language processing. Rather than trying to estimate directly the probability distribution of a random sentence, we will detect syntactic structures in the language, which can be used to modify and create new sentences from an initial sample.The study of syntactic structures will be done using Markov substitute sets, sets of strings that can be freely substituted in any sentence without affecting the whole distribution. These sets define the notion of Markov substitute processes, modelling conditional independence of certain substrings (given by the sets) with respect to their context. This point of view splits the issue of language analysis into two parts, a model selection stage where Markov substitute sets are selected, and a parameter estimation stage where the actual frequencies for each set are estimated.We show that these substitute processes form exponential families of distributions, when the language structure (the Markov substitute sets) is fixed. On the other hand, when the language structure is unknown, we propose methods to identify Markov substitute sets from a statistical sample, and to estimate the parameters of the distribution. Markov substitute sets show some connections with context-Free grammars, that can be used to help the analysis. We then proceed to build invariant dynamics for Markov substitute processes. They can among other things be used to effectively compute the maximum likelihood estimate. Indeed, Markov substitute models can be seen as the thermodynamical limit of the invariant measure of crossing-Over dynamics
Miranda, Jorge Umberto Ramalho. « Os fundos permanentes na Casa Pia de Lisboa ». Master's thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/16219.
Texte intégralIsmail, Aneesah. « Characterisation of Eight Non-Codis Ministrs in Four South African Populations to Aid The Analysis of Degraded Dna ». Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_9258_1280766024.
Texte intégralIn many forensic cases, such as mass disasters reconstruction cases, the recovered DNA is highly degraded. In such incidences, typing of STR loci has become one of the most powerful tools for retrieving information from the degraded DNA. However, as DNA degradation proceeds, three phenomena occur consecutively: loci imbalance, allele dropout and no amplification. To solve the problem of degraded DNA, redesigned primer sets have been developed in which the primers were positioned as close as possible to the STR repeat region. These reduced primer sets were called Miniplexes. Unfortunately, a few of the CODIS STR loci cannot be made into smaller amplicons. For this reason non-CODIS miniSTRs have been developed. The present study was undertaken for the population genetic analysis of microsatellite variation in four South African populations
Afrikaner, Xhosa, Mixed Ancestry and Asian Indian using eight non-CODIS miniSTR loci. These miniSTRs loci were characterized within the populations by estimating the levels of diversity of the markers, estimating the population genetic parameters, and studying the inter-population relationships. All of the miniSTRs were amplified successfully and the genetic variability parameters across all loci in Afrikaner, Mixed Ancestry, Asian Indian and Xhosa were estimated to be in the range of 3 (D4S2364) to 12 (D9S2157) alleles, the total number of alleles over all loci ranged from 100 to 204, the allelic richness ranged from 3.612 to 10.307 and the heterozygosity ranged from 0.4360 to 0.8073. Genetic distance was least between Afrikaner and Asian Indian and highest between Xhosa and Mixed Ancestry. Deviations from Hardy-Weinberg equilibrium were not observed for most of the loci. The low mean FIS (-0.027) and FIT (-0.010) and FST (0.017) values across the populations indicated low level of inbreeding within (FIS) and among (FST) the populations. The Asian Indian population showed higher levels of the inbreeding coefficient, indicating less gene exchange between it and other populations. These 8 markers can be used for genetic investigations and assessing population structure. The study contributed to the knowledge and genetic characterization of four South African populations. In addition, these MiniSTRs prove to be useful in cases where more genetic information is needed.
Schmelzer, Kara Renee. « Oxidized lipids in systemic and lung inflammatory models / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Texte intégralSokhansanj, Bahrad Ali. « Mathematical models of human DNA base excision repair / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Texte intégral