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Dissertations / Theses on the topic 'Model quasar'

Author: Grafiati
Published: 28 May 2022
Last updated: 30 July 2025

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1

Яковенко, А. В. "Квазар". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/44007.

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Квазар - це позагалактичний об'єкт, що відрізняється високою світністю і дуже малим кутовим розміром. Це найпотужніші відомі джерела енергії в космосі. Вперше квазар був виявленийу 1962р. астрономом Маартен Шмідтоми в обсерваторії Маунт – Паломар. На разі виявлено понад 5000 квазарів, але завдяки сучасним телескопам цілком можливо виявити ще мільйони квазарів.
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2

Ramamonjisoa, Fidy Andriamanankasina. "Modelling radio galaxies in the Millennium simulation: SKA/MeerKAT sources and CMB contaminants." University of the Western Cape, 2010. http://hdl.handle.net/11394/2944.

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Magister Scientiae - MSc<br>We investigate the modelling of radio galaxies within a semi-analytic framework in the Millennium Simulation of the Virgo Consortium. The aim is to assess the radio sources contamination of Sunyaev-Zeldovich (SZ) signatures of clusters of galaxies in Cosmic Microwave Background (CMB) experiments. The modelling is also relevant to the Karoo Array Telescope (MeerKAT) and the Square Kilometre Array (SKA) science. The semi-analytical model consists of N-body simulation, the Millennium Run to trace the merger history of dark matter haloes within the Λ Cold Dark Matter (Λ
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3

Castellaro, Marco. "Quantitative neuroimaging of perfusion with arterial spin labeling: deconvolution and physiology-based models." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423808.

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Perfusion studies with Magnetic Resonance Imaging (MRI) techniques traditionally require the injection of exogenous contrast agents. Arterial Spin Labeling (ASL) technique permits to use water contained in the blood as an endogenous contrast agent, reducing the intrinsic invasively process required by this kind of examination.Furthermore it increases patient's comfort and reduces cost effective of perfusion measurements in clinical environment. This key feature allows to estimate perfusion in particular patients, like children or in case of allergy to the tracer. Another advantage is the poss
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4

Carvalho, Silas Luiz de. "Persistência de ordem em modelos ferromagnéticos na presença de campos auto-similares quase aleatórios\"." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02042008-144148/.

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Neste trabalho estudamos a existência de ordem de longo alcance em modelos ferromagnéticos na presença de um campo externo cuja configuração apresenta um padrão tipicamente aleatório. Provamos por meio do argumento de Peierls modificado por Griffiths para o estudo de um antiferromagneto, que o modelo de Ising ferromagnético bidimensional exibe, para um campo alternado de intensidade fraca, ordem de longo alcance `a temperatura finita. Propomos dar um passo além considerando campos auto-similares esparsos, cuja soma é nula em todas as escalas. Estudamos também o modelo hierárquico em duas dimen
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5

Auríchio, Vinícius Henrique. "Deformações quase-integráveis do modelo de Bullough-Dodd." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-08092014-153357/.

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Esta dissertação investiga uma particular deformação do modelo de Bullough-Dodd. Não se sabe se tais deformações são ou não integráveis, ainda que nossas simulações numéricas apresentem soluções solitônicas. Exploramos o conceito de quase-integrabilidade em mais esse contexto e mostramos um argumento analítico para a quase-conservação das cargas (isto é, as cargas variam com o tempo, mas seus valores inicial e final são os mesmos). Mesmo quando o argumento analítico não pode fazer previsões, nossas simulações mostram que as cargas apresentam o mesmo comportamento. Isso sugere que as deformaçõe
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6

Fröhlich, Kristina, Christoph Jacobi, Martin Lange, and Alexander Pogoreltsev. "The quasi two-day wave." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217134.

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The quasi two-day wave (QTDW), a prominent feature of the mesosphere mainly around solstices, is simulated with the COMMA-LIM Model (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology). The calculations are made approximately one month after the summer solstice in the Northern Hemisphere when the QTDW reaches its maximum in the mesosphere and lower thermosphere. The results show that the QTDW produces a moderate westward forcing of the zonally averaged flow and a poleward driving of the residual mean meridional circulation<br>Die Quasi Zwei-Tage Welle (QTDW), eine deutl
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7

Lu, Yaohui. "Scheduling quasi-min-max model predictve control." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/11692.

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8

Nguyen, Thi Thanh Huyen. "Quasi optimal model checking for concurrent systems." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCD087.

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En effectuant une exploration exhaustive de tous les comportements possibles du système, le model checking fait face au problème de l’explosion de cet espace d’états. Notre but est de vérifier des programmes concurrents. Nous avons proposé de combiner la DPOR et le dépliage dans un algorithme appelé POR basée sur le dépliage. Dans cette thèse, nous prouvons que le calcul des alternatives dans une DPOR optimale est un problème NP-complet. Nous proposons une approche hybride appelée réduction d’ordre partiel quasi-optimale (QPOR). En particulier, nous proposons une nouvelle notion d’alternative k
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9

Rodrigues, Tulio Eduardo. "O modelo de cascata intranuclear MCMC e aplicações para o mecanismo do quase-dêuteron e a fotoprodução de pions em energias intermediárias e altas." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-27042009-114231/.

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O Presente trabalho propôs o estudo de reações fotonucleares e fotoprodução de pions em energias intermediárias e altas usando o modelo de cascata intranuclear MCMC para a fase rápida de reação e outro algoritmo de Monte Carlo para descrever o processo de decaimento do núcleo composto via evaporação de partículas e fissão nuclear. Dentre as principais inovações implementadas no MCMC, podemos citar: i) a inclusão detalhada do canal do quase-dêuteron no intervalo 20 < Eg < 140 MeV; ii) o desenvolvimento inédito e rigoroso de um mecanismo de bloqueio de Pauli não-estocástico, avaliando as excitaç
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10

Hatzinger, Reinhold. "A GLM framework for item response theory models. Reissue of 1994 Habilitation thesis." Department of Statistics and Mathematics, WU Vienna University of Economics and Business, 2008. http://epub.wu.ac.at/1384/1/document.pdf.

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The aim of the monograph is to contribute towards bridging the gap between methodological developments that have evolved in the social sciences, in particular in psychometric research, and methods of statistical modelling in a more general framework. The first part surveys certain special psychometric models (often referred to as Rasch family of models) that share common properties: separation of parameters describing qualities of the subject under investigation and parameters related to properties of the situation under which the response of a subject is observed. Using conditional maximum li
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11

Qian, Kun. "REAL-TIME MODEL PREDICTIVE CONTROL OF QUASI-KEYHOLE PIPE WELDING." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/8.

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Quasi-keyhole, including plasma keyhole and double-sided welding, is a novel approach proposed to operate the keyhole arc welding process. It can result in a high quality weld, but also raise higher demand of the operator. A computer control system to detect the keyhole and control the arc current can improve the performance of the welding process. To this effect, developing automatic pipe welding, instead of manual welding, is a hot research topic in the welding field. The objective of this research is to design an automatic quasi-keyhole pipe welding system that can monitor the keyhole and c
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12

Shalam, Moinuddin Khaja. "Parallelization of a quasi-3D nearshore circulation model." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-07092004-121009.

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13

Silva, Pedro André Arroyo. "Modelo matemático com parâmetros que dependem da discretização: aplicação ao estudo de fenômenos de propagação discreta em meios excitáveis." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/7194.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-07-26T12:29:23Z No. of bitstreams: 1 pedroandrearroyosilva.pdf: 4154699 bytes, checksum: 1875b7d54dd015591fcdd55db287ee37 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-09-03T16:20:02Z (GMT) No. of bitstreams: 1 pedroandrearroyosilva.pdf: 4154699 bytes, checksum: 1875b7d54dd015591fcdd55db287ee37 (MD5)<br>Made available in DSpace on 2018-09-03T16:20:02Z (GMT). No. of bitstreams: 1 pedroandrearroyosilva.pdf: 4154699 bytes, checksum: 1875b7d54dd015591fcdd55db287ee37 (MD5) Previous issu
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14

Quaiser, Tom [Verfasser]. "Data- and model-based identification of biochemical processes / Tom Quaiser." Aachen : Shaker, 2012. http://d-nb.info/1069045845/34.

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15

Angelini, Giovanni <1986&gt. "Estimation of Quasi-Rational DSGE Models." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6743/1/Angelini_Giovanni_tesi.pdf.

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Small-scale dynamic stochastic general equilibrium have been treated as the benchmark of much of the monetary policy literature, given their ability to explain the impact of monetary policy on output, inflation and financial markets. One cause of the empirical failure of New Keynesian models is partially due to the Rational Expectations (RE) paradigm, which entails a tight structure on the dynamics of the system. Under this hypothesis, the agents are assumed to know the data genereting process. In this paper, we propose the econometric analysis of New Keynesian DSGE models under an alternative
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16

Angelini, Giovanni <1986&gt. "Estimation of Quasi-Rational DSGE Models." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6743/.

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Small-scale dynamic stochastic general equilibrium have been treated as the benchmark of much of the monetary policy literature, given their ability to explain the impact of monetary policy on output, inflation and financial markets. One cause of the empirical failure of New Keynesian models is partially due to the Rational Expectations (RE) paradigm, which entails a tight structure on the dynamics of the system. Under this hypothesis, the agents are assumed to know the data genereting process. In this paper, we propose the econometric analysis of New Keynesian DSGE models under an alternative
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17

Naves, Eduardo Lázaro Martins. "Modelagem e simulação do controle da postura ereta humana quasi-estática com reflexos neuromusculares." Universidade Federal de Uberlândia, 2006. https://repositorio.ufu.br/handle/123456789/14282.

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This work presents a computer mathematical model of the human neuromusculoskeletal system specially designed to study the postural balance in standing. In addition to the extrafusal muscle tissue properties commonly used in traditional muscle models applied to study human movement and posture, this model includes two components physiologically important of postural control system: the intrafusal muscle tissue properties and intrinsic reflex responses provided by three neuromuscular organs (muscle spindles, Golgi tendon and Rhenshaw cells). The global model treats the body as a single-link inve
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18

Lewis, Daniel. "A quasi-dimensional spark ignition two stroke engine model." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14808.

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Despite challenges with poor emissions and fuel economy, gasoline two stroke engines continue to be developed for a number of applications. The primary reasons for the choice of a gasoline two stroke engine includes its low cost, mechanical simplicity and high specific power output. Some applications for the gasoline two stroke engine include small capacity motorcycles and scooters, off road recreational vehicles, hand held power tools and unmanned aerial vehicles. New technologies, which are already mature in four stroke engines, are now being applied to two stroke engines. Such technologies
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19

Casati, Alessandro. "A quasi-linear gyrokinetic transport model for tokamak plasmas." Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11043.

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Le développement d'un modèle de transport gyrocinétique quasi-linéaire pour les plasmas de tokamak, conçu pour fournir des prévisions physiquement fiables des quantités thermodynamiques pertinentes, est une tâche qui a exigé des liens étroits entre les études théoriques, expérimentales et numériques. Le cadre du modèle ici développé, Qualikiz, qui exploite une réduction de complexité par rapport à la dynamique non-linéaire du plasma, permet de multiples validations de la compréhension actuelle de la micro-turbulence dans les tokamaks. Les principaux résultats de cette thèse découlent des étape
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20

Adhikari, Kiran. "Verifying a Quantitative Relaxation of Linearizability via Refinement." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23222.

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Concurrent data structures have found increasingly widespread use in both multicore and distributed computing environments, thereby escalating the priority for verifying their correctness. The thread safe behavior of these concurrent objects is often described using formal semantics known as linearizability, which requires that  every operation in a concurrent object appears to take effect between its invocation and response. Quasi linearizability is a quantitative relaxation of linearizability to allow more implementation freedom for performance optimization.  However, ensuring the quantitati
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21

Al, zghool Raed Ahmad Hasan. "Estimation for state space models quasi-likelihood and asymptotic quasi-likelihood approaches /." Access electronically, 2008. http://ro.uow.edu.au/theses/91.

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22

Tita, Volnei. "Contribuição ao estudo de danos e falhas progressivas em estruturas de material compósito polimérico." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-10092015-114215/.

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Neste trabalho buscou-se propor e implementar um modelo de material capaz de prever o comportamento mecânico de estruturas em compósitos poliméricos reforçados (CPR). Inicialmente fez-se um levantamento bibliográfico sobre os modos de danificação intralaminar e falhas interlaminares bem como sobre formas de abordagem (analítica e numérica) para tratar esses problemas. Em seguida, foram apresentadas em detalhes as etapas experimentais executadas, descrevendo todo o procedimento de fabricação dos corpos-de-prova e os resultados obtidos a partir dos ensaios quase-estáticos de tração, compressão,
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23

Rashid, Maher S. "Quasi-integrable models in (2+1) dimensions." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/5780/.

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Recently σ-models have received a lot of attention for many reasons. One interesting aspect of the CP(^n) sigma models is the fact they are the simplest Lorentz invariant models which possess topologically stable (minimum of the action) solutions in (2+0) dimensions. Unfortunately, it appears that Lorentz covariance and integrability are incompatable in (2+1) dimensions. In the literature a few integrable models were constructed in (2+1) dimensions at the expense of Lorentz invariance (e.g. modified chiral model,...). An alternative way to proceed is to retain Lorentz invariance and relax the
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24

Pereira, Daniel José. "Embolia pulmonar experimental = um modelo quase fatal." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/309566.

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Orientador: Heitor Moreno Junior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas<br>Made available in DSpace on 2018-08-19T02:49:22Z (GMT). No. of bitstreams: 1 Pereira_DanielJose_M.pdf: 8289618 bytes, checksum: f81b30485257dfeb1919e76b99cecc7d (MD5) Previous issue date: 2011<br>Resumo: Introdução: estudos experimentais de embolia pulmonar (EP) são habitualmente realizados sob ventilação mecânica. Como a maioria dos pacientes com suspeita de EP adentra os Serviços de Emergência em respiração espontânea e em ar ambiente, estudos que medissem as var
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25

Beiranvand, Vahid. "Multi-haul quasi network flow model for vertical alignment optimization." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/56673.

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The vertical alignment optimization problem for road design aims to generate a vertical alignment of a new road with a minimum cost, while satisfying safety and design constraints. We present a new model called multi-haul quasi network flow (MH-QNF) for vertical alignment optimization that improves the accuracy and reliability of previous mixed integer linear programming models. We evaluate the performance of the new model compared to two state-of-the-art models in the field: the complete transportation graph (CTG) and quasi network flow (QNF) models. The numerical results show that, within 1
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26

Cummins, Patrick F. "A quasi-geostrophic circulation model of the Northeast Pacific Ocean." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29082.

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A limited-area quasi-geostrophic numerical model with mesoscale resolution is developed to study the circulation in the Northeast Pacific Ocean. The model domain extends from the British Columbia/Alaska coast out to 170°W and down to 45°N, and incorporates the coastline geometry and bottom topography of the region. In a benchmark experiment, the circulation is driven with a steady, climatological wind stress curl field. Statistical properties of the solution are determined from a long-term integration and compared with observations from the Gulf of Alaska. The cyclonic circulation of the mode
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27

Ung, Hervé. "Quasi real-time model for security of water distribution network." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0015/document.

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Le but de cette thèse est de modéliser la propagation d’un contaminant au sein d’un réseau d’eau potable muni de capteurs temps réel. Elle comporte les trois axes de développement suivant: la résolution des équations de transport, celle du problème d’identification des sources de contamination et le placement des capteurs.Le transport d’un produit chimique est modélisé dans un réseau d’eau potable par l’équation de transport réaction 1-D avec l’hypothèse de mélange parfait aux noeuds. Il est proposé d’améliorer sa prédiction par l’ajout d’un modèle de mélange imparfait aux jonctions double T e
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28

Keller, Peter, Sylvie Roelly, and Angelo Valleriani. "A quasi-random-walk to model a biological transport process." Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6358/.

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Transport Molecules play a crucial role for cell viability. Amongst others, linear motors transport cargos along rope-like structures from one location of the cell to another in a stochastic fashion. Thereby each step of the motor, either forwards or backwards, bridges a fixed distance. While moving along the rope the motor can also detach and is lost. We give here a mathematical formalization of such dynamics as a random process which is an extension of Random Walks, to which we add an absorbing state to model the detachment of the motor from the rope. We derive particular properties of such
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29

Piepmeier, Jenelle Armstrong. "A dynamic quasi-newton method for model independent visual servoing." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18391.

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30

Maldonado-Villanueva, Sergio. "Quasi 2-layer morphodynamic model and Lagrangian study of bedload." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19574.

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Conventional morphodynamic models are typically based on a coupled system of hydrodynamic equations, a bed-update equation, and a sediment-transport equation. However, the sediment-transport equation is almost invariably empirical, with numerous options available in the literature. Bed morphological evolution predicted by a conventional model can be very sensitive to the choice of sediment-transport formula. This thesis presents a physics-based model, where the shallow water-sediment-mixture flow is idealised as being divided into two layers of variable (in time and space) densities: the lower
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31

Ge, Wentao. "Bootstrap-adjusted Quasi-likelihood Information Criteria for Mixed Model Selection." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu156207676645628.

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32

Tsang, Kin Ting. "Interactive 3D model reconstruction from images and quasi-dense points /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?COMP%202004%20TSANG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 59-62). Also available in electronic version. Access restricted to campus users.
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Ambrosio, Alice. "Quasi-periodic solutions for a PDE model arising in hydrodynamics." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/29946.

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Kovacs, E., and Z. Gulacsi. "Exact ground states for quasi 1D systems with hubbard interaction." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20658.

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Using a positive semidefinite operator technique we deduced exact ground states for a modified diamond chain described by a non-integrable Hubbard model with on-site repulsion. Our results are valid for arbitrary length of the chain and strength of the Hubbard interaction. For the analyzed quasi 1D chain structure we found that two flat bands are present in the bare band structure of the system, both for zero and for a fixed value of magnetic field. We obtained ground states of nonmagnetic and ferromagnetic insulator type and studied their physical properties. When you are citing the document,
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Sempf, Mario. "Nichtlineare Dynamik atmosphärischer Zirkulationsregime in einem idealisierten Modell." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2005/598/.

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Unter atmosphärischen Zirkulationsregimen versteht man bevorzugte quasi-stationäre Zustände der atmosphärischen Zirkulation auf der planetaren Skala, die für eine bis mehrere Wochen persistieren können. Klimaänderungen, ob natürlich entstanden oder anthropogen verursacht, äußern sich in erster Linie durch Änderungen der Auftrittswahrscheinlichkeiten der natürlichen Regime. <br><br> In der vorliegenden Arbeit wurden dynamische Mechanismen des Regimeverhaltens und der dekadischen Klimavariabilität der Atmosphäre bei Abwesenheit zeitlich veränderlicher externer Einflussfaktoren untersucht. Das Ha
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Turon, Travesa Albert. "Simulation of delamination in composites under quasi-static and fatigue loading using cohesive zone models." Doctoral thesis, Universitat de Girona, 2006. http://hdl.handle.net/10803/7764.

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Es desenvolupa una eina de disseny per l'anàlisi de la tolerància al dany en composites. L'eina pot predir el inici i la propagació de fisures interlaminars. També pot ser utilitzada per avaluar i planificar la necessitat de reparar o reemplaçar components durant la seva vida útil. El model desenvolupat pot ser utilitzat tan per simular càrregues estàtiques com de fatiga.<br/>El model proposat és un model de dany termodinàmicament consistent que permet simular la delaminació en composites sota càrregues variables. El model es formula dins el context de la Mecànica del Dany, fent ús dels models
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Zhydenko, Olexandr. "Perturbações lineares de buracos negros: estabilidade, modos quase-normais e caudas." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-17082009-092359/.

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Buracos negros têm as suas oscilações próprias, que são chamadas modos quase-normais. As oscilações próprias de buracos negros astrofísicos podem ser observadas no futuro mais próximo com a ajuda de detectores de ondas gravitacionais. Os modos quase-normais são também muito importantes no contexto de teste da estabilidade de objetos negros, da correspondência anti-deSitter/ Teoria Campos Conformes (AdS/CFT) e nas teorias em dimensões mais altas, como os cenários de mundo-brana e teoria das cordas. Esta tese revê um numero de trabalhos, que fornecem um estudo completo do espectro quase normal d
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Hatzinger, Reinhold, and Walter Katzenbeisser. "Log-linear Rasch-type models for repeated categorical data with a psychobiological application." Department of Statistics and Mathematics, WU Vienna University of Economics and Business, 2008. http://epub.wu.ac.at/126/1/document.pdf.

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The purpose of this paper is to generalize regression models for repeated categorical data based on maximizing a conditional likelihood. Some existing methods, such as those proposed by Duncan (1985), Fischer (1989), and Agresti (1993, and 1997) are special cases of this latent variable approach, used to account for dependencies in clustered observations. The generalization concerns the incorporation of rather general data structures such as subject-specific time-dependent covariates, a variable number of observations per subject and time periods of arbitrary length in order to evaluate treatm
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39

Camacho, Casero Jorge. "Automatically idealising quasi-axisymmetric component models to 2D axisymmetric finite element models." Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725496.

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At present, simulation is at the core of the product development cycle. To accelerate the design and simulation phases, it is necessary to idealise the CAD model prior to simulation activities. The strategy for model idealisation to be used depends on the original geometry and the type of analysis to be run. In industry, many components are either axisymmetric or quasi-axisymmetric, (i.e. largely axisymmetric with some non-axisymmetric features). Using 3D models for analising these components is computationally expensive and is often unpractical, especially at early stages of the design proces
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40

Chen, Yibing 1957. "Heat transport by planetary waves in a nonlinear quasi-geostrophic model." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61907.

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41

Germerie, Guizouarn Loïc. "Automates communicants et communications quasi-synchrones." Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4112.

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Les systèmes distribués sont le plus souvent basés sur l'échange asynchrone de messages entre des agents. La programmation par échanges de messages est largement utilisée en calcul haute performance, en programmation événementielle, dans les architectures orientées service, etc. Malheureusement du fait de la variété des modèles de communication, des ambiguïtés dans les spécifications, de la portabilité limitée du code, ou encore de la difficulté à exécuter des tests, il est très difficile de vérifier les systèmes communicants. Le model-checking de systèmes communicants vise à analyser des modè
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42

Fröhlich, Kristina, Christoph Jacobi, Martin Lange, and Alexander Pogoreltsev. "The quasi two-day wave: the results of numerical simulation with the COMMA - LIM Model." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 26 = Meteorologische Arbeiten aus Leipzig ; 7 (2002), S. 122-134, 2002. https://ul.qucosa.de/id/qucosa%3A15226.

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The quasi two-day wave (QTDW), a prominent feature of the mesosphere mainly around solstices, is simulated with the COMMA-LIM Model (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology). The calculations are made approximately one month after the summer solstice in the Northern Hemisphere when the QTDW reaches its maximum in the mesosphere and lower thermosphere. The results show that the QTDW produces a moderate westward forcing of the zonally averaged flow and a poleward driving of the residual mean meridional circulation.<br>Die Quasi Zwei-Tage Welle (QTDW), eine deu
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43

Jara, Diego Alejandro Carvajal. "A extensão do modelo estocástico \'Raise and Peel\' com absorção controlada." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-12092017-080429/.

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O modelo estocástico Raise and Peel é estudado nesta tese. Para isto é utilizado o método de simulação por Monte Carlo junto com os métodos de diagonalização exata e numérica do operador de Liouville. Este modelo estocástico é um modelo de crescimento unidimensional com dois parâmetros livres. Um parâmetro de absorção local e um parâmetro de dessorção não local. Em função destes dois parâmetros se observa um rico diagrama de fase, apresentando regiões massivas, regiões criticamente auto-organizadas, estados quase-estacionários e transições a múltiplos estados absorventes. O principal resultado
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44

Souza, dos Santos Edgar Gonzaga. "Etude théorique et expérimentale des propriétés magnétiques des oxydes de métaux de transition quasi-bidimensionnels du type AB2O6." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY047/document.

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Ce travail a pour objectif de contribuer à l'étude du magnétisme dans les oxydes isolants de type AB_2O_6 (A= Fe, Co, Ni; B= Ta, Sb). Ces composés cristallisent dans une structure trirutile et présentent une variété très riche de phases magnétiques. Tous les ordres observés peuvent être classés comme antiferromagnétiques mais diffèrent d'un ordre simple de type Néel. En outre, les substitutions comme Fe_xCo_{1-x}Ta_2O_6, Fe_xNi_{1-x}Ta_2O_6 et Co_xNi_{1-x}Ta_2O_6 conduisent à des domaines de coexistence de phases magnétiques et à des points bicritiques dans les diagrammes de phases T(x). Une c
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45

Vieira, Andre de Pinho. "Efeitos de desordem ou aperiodicidade sobre o comportamento de sistemas magnéticos." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-23022012-155648/.

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Consideramos os efeitos de desordem ou aperiodicidade sobre três sistemas magnéticos distintos. Inicialmente, apresentamos um modelo fenomenológico para descrever a dependência térmica da magnetização remanente induzida por diluição numa classe de antiferromagnetos quase-unidimensionais. O modelo trata exatamente as correlações ao longo da direção dominante, levando em conta as demais interações por meio de um campo efetivo. Em seguida, utilizamos uma aproximação autoconsistente de Bethe-Peierls para avaliar os efeitos de um campo cristalino aleatório sobre os diagramas de fases de um modelo d
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46

Johnson, Stephen. "A quasi-dimensional model for performance and emissions predictions in a dual fuel engine." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10975.

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A new quasi-dimensional, multi-zone model has been developed to describe the combustion processes occurring inside a dual fuel engine. A dual fuel engine is a compression ignition engine in which a homogeneous lean premixed charge of gaseous fuel and air is ignited by a pilot fuel spray. The atomisation and preparation of the pilot leads to the formation of multiple ignition centres from which turbulent flame fronts develop. The energy release in a dual fuel engine is therefore a combination of that from the combustion of the pilot fuel spray and lean premixed charge. Hence, the dual fuel comb
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Faria, Antonio Fernando Garcez. "A simple quasi-three dimensional model of longshore currents over arbitrary profile." Thesis, [Monterey, Calif. : Naval Postgraduate School], 1995. http://catalog.hathitrust.org/api/volumes/oclc/35646712.html.

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48

Hernández, Marco Manuel. "A non-linear quasi-3D model for air management modelling in engines." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/103683.

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El modelado se ha convertido en los últimos años en una herramienta esencial en el diseño de motores de combustión interna alternativos, ya que permite reducir considerablemente el tiempo y los costes de desarrollo. Las metodologías de diseño clásicas se basan en la fabricación de prototipos y la realización de pruebas de ensayo y error. Actualmente, la mayoría de estas pruebas han sido sustituidas por cálculos numéricos, de modo que sólo las opciones de diseño más prometedoras se prueban en realidad en banco motor. Durante años, los códigos unidimensionales de dinámica de gases en el dominio
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Yue, Rong-xian. "Applications of quasi-Monte Carlo methods in model-robust response surface designs." HKBU Institutional Repository, 1997. http://repository.hkbu.edu.hk/etd_ra/178.

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50

Mukougawa, Hitoshi. "A DYNAMICAL MODEL OF “QUASI-STATIONARY” STATES IN LARGE-SCALE ATMOSPHERIC MOTIONS." 京都大学 (Kyoto University), 1987. http://hdl.handle.net/2433/86387.

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