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Thèses sur le sujet « Hamiltonian problems »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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1

Pester, Cornelia. "Hamiltonian eigenvalue symmetry for quadratic operator eigenvalue problems." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601470.

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When the eigenvalues of a given eigenvalue problem are symmetric with respect to the real and the imaginary axes, we speak about a Hamiltonian eigenvalue symmetry or a Hamiltonian structure of the spectrum. This property can be exploited for an efficient computation of the eigenvalues. For some elliptic boundary value problems it is known that the derived eigenvalue problems have this Hamiltonian symmetry. Without having a specific application in mind, we trace the question, under which assumptions the spectrum of a given quadratic eigenvalue problem possesses the Hamiltonian structure.

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2

Watkinson, Laura. "Four Dimensional Variational Data Assimilation for Hamiltonian Problems." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485506.

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In this thesis we bring together two areas of mathematics; Hamiltonian dynamics and data assimilation. We construct a four dimensional variational (4d Var) data assimilation scheme for two Hamiltonian systems. This is to reflect the Hamiltonian behaviour observed in the atmosphere. We know, for example, that potential vorticity is conserved in atmospheric models. However, current data assimilation schemes do not explicitly include such physical relationships. In this thesis, by considering the two and three body problems, we demonstrate how such characteristic behaviour can be included in the

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3

Groves, Mark David. "Hamiltonian theory and its application to water-wave problems." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316842.

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4

Koch, Michael Conrad. "Inverse analysis in geomechanical problems using Hamiltonian Monte Carlo." Kyoto University, 2020. http://hdl.handle.net/2433/253350.

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5

Lignos, Ioannis. "Reconfigurations of combinatorial problems : graph colouring and Hamiltonian cycle." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12098/.

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We explore algorithmic aspects of two known combinatorial problems, Graph Colouring and Hamiltonian Cycle, by examining properties of their solution space. One can model the set of solutions of a combinatorial problem $P$ by the solution graph $R(P)$, where vertices are solutions of $P$ and there is an edge between two vertices, when the two corresponding solutions satisfy an adjacency reconfiguration rule. For example, we can define the reconfiguration rule for graph colouring to be that two solutions are adjacent when they differ in colour in exactly one vertex. The exploration of the proper

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6

Gu, Xiang. "Hamiltonian structures and Riemann-Hilbert problems of integrable systems." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7677.

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We begin this dissertation by presenting a brief introduction to the theory of solitons and integrability (plus some classical methods applied in this field) in Chapter 1, mainly using the Korteweg-de Vries equation as a typical model. At the end of this Chapter a mathematical framework of notations and terminologies is established for the whole dissertation. In Chapter 2, we first introduce two specific matrix spectral problems (with 3 potentials) associated with matrix Lie algebras $\mbox{sl}(2;\mathbb{R})$ and $\mbox{so}(3;\mathbb{R})$, respectively; and then we engender two soliton hierarc

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7

Parodi, Emanuele. "Classiﬁcation problems for Hamiltonian evolutionary equations and their discretizations". Doctoral thesis, SISSA, 2012. http://hdl.handle.net/20.500.11767/4704.

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In the present Thesis, we deal mainly with the subclass of Hamiltonian evolutionary PDEs and their Poisson brackets (PBs). We address the problem of classifying discrete differential-geometric PBs (dDGPBs) of any ﬁxed order on target space of dimension 1 and describing their compatible pencils. Furthermore, we explain a new criterium about the existence of tri-Hamiltonian structures for nonlinear wave systems.

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8

Rudoy, Mikhail. "Hamiltonian cycle and related problems : vertex-breaking, grid graphs, and Rubik's Cubes." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113112.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 123-124).<br>In this thesis, we analyze the computational complexity of several problems related to the Hamiltonian Cycle problem. We begin by introducing a new problem, which we call Tree-Residue Vertex-Breaking (TRVB). Giv

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9

De, Martino Giuseppe. "Multi-Value Numerical Modeling for Special Di erential Problems." Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1982.

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2013 - 2014<br>The subject of this thesis is the analysis and development of new numerical methods for Ordinary Di erential Equations (ODEs). This studies are motivated by the fundamental role that ODEs play in applied mathematics and applied sciences in general. In particular, as is well known, ODEs are successfully used to describe phenomena evolving in time, but it is often very di cult or even impossible to nd a solution in closed form, since a general formula for the exact solution has never been found, apart from special cases. The most important cases in the applications are sys

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10

Kang, Jinghong. "The Computational Kleinman-Newton Method in Solving Nonlinear Nonquadratic Control Problems." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30435.

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This thesis deals with non-linear non-quadratic optimal control problems in an autonomous system and a related iterative numerical method, the Kleinman-Newton method, for solving the problem. The thesis proves the local convergence of Kleinman-Newton method using the contraction mapping theorem and then describes how this Kleinman-Newton method may be used to numerically solve for the optimal control and the corresponding solution. In order to show the proof and the related numerical work, it is necessary to review some of earlier work in the beginning of Chapter 1 [Zhang], an

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11

Attia, Ahmed Mohamed Mohamed. "Advanced Sampling Methods for Solving Large-Scale Inverse Problems." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73683.

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Ensemble and variational techniques have gained wide popularity as the two main approaches for solving data assimilation and inverse problems. The majority of the methods in these two approaches are derived (at least implicitly) under the assumption that the underlying probability distributions are Gaussian. It is well accepted, however, that the Gaussianity assumption is too restrictive when applied to large nonlinear models, nonlinear observation operators, and large levels of uncertainty. This work develops a family of fully non-Gaussian data assimilation algorithms that work by directly sa

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12

Yang, Weihua. "Supereulerian graphs, Hamiltonicity of graphes and several extremal problems in graphs." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00877793.

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In this thesis, we focus on the following topics: supereulerian graphs, hamiltonian line graphs, fault-tolerant Hamiltonian laceability of Cayley graphs generated by transposition trees, and several extremal problems on the (minimum and/or maximum) size of graphs under a given graph property. The thesis includes six chapters. The first one is to introduce definitions and summary the main results of the thesis, and in the last chapter we introduce the furture research of the thesis. The main studies in Chapters 2 - 5 are as follows. In Chapter 2, we explore conditions for a graph to be supereul

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13

Breitenbach, Tim [Verfasser], Alfio [Gutachter] Borzi, and Kurt [Gutachter] Chudej. "A sequential quadratic Hamiltonian scheme for solving optimal control problems with non-smooth cost functionals / Tim Breitenbach ; Gutachter: Alfio Borzi, Kurt Chudej." Würzburg : Universität Würzburg, 2019. http://d-nb.info/1188564781/34.

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14

Sfecci, Andrea. "Some existence results for boundary value problems : a promenade along resonance." Doctoral thesis, SISSA, 2012. http://hdl.handle.net/20.500.11767/4703.

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I present many existence result to many boundary value problems, in particular periodic problems and Neumann elliptic problems. The results use the method of the topological degree theory. In the thesis different problems are treated: planar systems, systems with a singularity, impact oscillators, coupled oscillators and radial elliptic problems.

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15

NASCIMENTO, Francisco José dos Santos. "Estabilidade Linear no Problema de Robe." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1309.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-04-19T13:09:32Z No. of bitstreams: 1 Francisco José dos Santos Nascimento.pdf: 743351 bytes, checksum: 997f8a5009a3bbc979a7206041daf583 (MD5)<br>Made available in DSpace on 2017-04-19T13:09:32Z (GMT). No. of bitstreams: 1 Francisco José dos Santos Nascimento.pdf: 743351 bytes, checksum: 997f8a5009a3bbc979a7206041daf583 (MD5) Previous issue date: 2017-02-17<br>CAPES<br>In this work, we discuss the article The Existence and Stability of Equilibrium Points in the Robe Restricted Three-Body Probem due to Hallan and Rana. For this we presen

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16

Weichselbaum, Andreas. "Nanoscale Quantum Dynamics and Electrostatic Coupling." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1091115085.

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17

Seewald, Nadiane Cristina Cassol [UNESP]. "Método do hamiltoniano termodinamicamente equivalente para sistemas de muitos corpos." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/102540.

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Made available in DSpace on 2014-06-11T19:32:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-04-04Bitstream added on 2014-06-13T18:43:09Z : No. of bitstreams: 1 seewald_ncc_dr_ift.pdf: 980110 bytes, checksum: a8da01736f6d240fb7a6880d23b95d14 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O objetivo da Tese é investigar a aplicabilidade e propor extensões do método do hamiltoniano termodinamicamente equivalente (MHTE) para sistemas de muitos corpos descritos por uma teoria de campos. Historicamente, o MHTE tem sua origem na teoria quântica de muitos corpos

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18

Seewald, Nadiane Cristina Cassol. "Método do hamiltoniano termodinamicamente equivalente para sistemas de muitos corpos /." São Paulo, 2012. http://hdl.handle.net/11449/102540.

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Orientador: Gastão Inácio Krein<br>Banca: Marcus Benghi Pinto<br>Banca: Ney Lemke<br>Banca: Sandra dos Santos Padula<br>Banca: Yogiro Hama<br>Resumo: O objetivo da Tese é investigar a aplicabilidade e propor extensões do método do hamiltoniano termodinamicamente equivalente (MHTE) para sistemas de muitos corpos descritos por uma teoria de campos. Historicamente, o MHTE tem sua origem na teoria quântica de muitos corpos para descrever o fenômeno da supercondutividade. O método consiste na observação de que o hamiltoniano de um sistema pode ser diagonalizado exatamente através de uma transformaç

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19

Moussi, El hadi. "Analyse de structures vibrantes dotées de non-linéarités localisées à jeu à l'aide des modes non-linéaires." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4792/document.

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Le travail de cette thèse a été réalisé dans le cadre d'une collaboration entre EDF R&D et le LMA de Marseille (CNRS). Le but était de développer des outils théoriques et numériques pour le calcul de modes non-linéaires de structures industrielles possédant des non-linéarités localisées à jeu. La méthode de calcul utilisée est une combinaison de la méthode d'équilibrage harmonique (EH) et de la méthode asymptotique numérique (MAN), appelée EHMAN. Elle est réputée pour sa robustesse sur les problèmes réguliers. L'enjeu de ce travail de thèse est de l'appliquer sur des problèmes non-régulier

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20

Schütte, Albrecht. "Hamiltonian flow equations and the electron phonon problem." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964423294.

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21

Bredariol, Grilo Alex. "Quantum proofs, the local Hamiltonian problem and applications." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC051/document.

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Dans la classe de complexité QMA – la généralisation quantique de la classe NP – un état quantique est fourni comme preuve à un algorithme de vérification pour l’aider à résoudre un problème. Cette classe de complexité a un problème complet naturel, le problème des Hamiltoniens locaux. Inspiré par la Physique de la matière condensée, ce problème concerne l’énergie de l’état fondamental d’un système quantique. Dans le cadre de cette thèse, nous étudions quelques problèmes liés à la classe QMA et au problème des Hamiltoniens locaux. Premièrement, nous étudions la différence de puissance si au li

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22

Rossato, Rafael Antonio. "Sistemas elípticos de tipo hamiltoniano perto da ressonância." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-13042015-164728/.

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Neste trabalho consideramos sistemas elípticos de tipo hamiltoniano, envolvendo o operador Laplaciano, com uma parte linear dependendo de dois parâmetros e uma perturbação sublinear. Obtemos a existência de pelo menos duas soluções quando a parte linear está perto da ressonância (este fenômeno é chamado de quase ressonância). Mostramos também a existência de uma terceira solução, quando a quase ressonância é em relação ao primeiro autovalor do operador Laplaciano. No caso ressonante obtemos resultados análogos, adicionando mais uma perturbação sublinear. Os sistemas estão associados a funciona

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23

Benner, Peter, and Cedric Effenberger. "A rational SHIRA method for the Hamiltonian eigenvalue problem." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900026.

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The SHIRA method of Mehrmann and Watkins belongs among the structure preserving Krylov subspace methods for solving skew-Hamiltonian eigenvalue problems. It can also be applied to Hamiltonian eigenproblems by considering a suitable transformation. Structure induced shift-and-invert techniques are employed to steer the algorithm towards the interesting region of the spectrum. However, the shift cannot be altered in the middle of the computation without discarding the information that has been accumulated so far. This paper shows how SHIRA can be combined with ideas from Ruhe's Rational Krylov a

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24

Jurčík, Lukáš. "Evoluční algoritmy při řešení problému obchodního cestujícího." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224447.

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This diploma thesis deals with evolutionary algorithms used for travelling salesman problem (TSP). In the first section, there are theoretical foundations of a graph theory and computational complexity theory. Next section contains a description of chosen optimization algorithms. The aim of the diploma thesis is to implement an application that solve TSP using evolutionary algorithms.

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25

Benner, P., and H. Faßbender. "A restarted symplectic Lanczos method for the Hamiltonian eigenvalue problem." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800797.

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A restarted symplectic Lanczos method for the Hamiltonian eigenvalue problem is presented. The Lanczos vectors are constructed to form a symplectic basis. Breakdowns and near-breakdowns are overcome by inexpensive implicit restarts. The method is used to compute eigenvalues, eigenvectors and invariant subspaces of large and sparse Hamiltonian matrices and low rank approximations to the solution of continuous-time algebraic Riccati equations with large and sparse coefficient matrices.

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26

Gupta, Vishal. "Decoupling of Hamiltonian system with applications to linear quadratic problem." Arlington, TX : University of Texas at Arlington, 2007. http://hdl.handle.net/10106/905.

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27

Bowles, Mark Nicholas. "A stability result for the lunar three body problem." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367149.

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28

Jones, Billy Darwin. "Light-front Hamiltonian approach to the bound-state problem in quantum electrodynamics /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487946103569513.

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29

SCHUMAN, BERTRAND. "Sur le probleme du centre isochrone des systemes hamiltoniens polynomiaux." Paris 6, 1998. http://www.theses.fr/1998PA066617.

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On presente une approche du probleme du centre qui utilise la theorie des formes normales de germes de champs de vecteurs polynomiaux a l'origine dans r 2 n. Un de nos points de vue est l'effectivite, au sens ou on utilise le calcul formel pour obtenir et calculer les coefficients de la forme normale de birkhoff. On calcule explicitement les premiers coefficients de la forme normale d'un champ de vecteurs hamiltonien polynomial homogene, et un debut d'etude des champs hamiltoniens non homogenes est entreprise, au sens ou, la aussi, on calcule completement les premiers coefficients des formes n

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30

Fiala, Jan. "DNA výpočty a jejich aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2014. http://www.nusl.cz/ntk/nusl-412902.

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This thesis focuses on the design and implementation of an application involving the principles of DNA computing simulation for solving some selected problems. DNA computing represents an unconventional computing paradigm that is totally different from the concept of electronic computers. The main idea of DNA computing is to interpret the DNA as a medium for performing computation. Despite the fact, that DNA reactions are slower than operations performed on computers, they may provide some promising features in the future. The DNA operations are based on two important aspects: massive parallel

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31

Diagne, Mamadou Lamine. "Modelling and control of systems of conservation laws with a moving interface : an application to an extrusion process." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10098/document.

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Cette thèse porte sur l’étude des systèmes de lois de conservation couplés par une interface mobile. Un modèle dynamique d’un procédé d’extrusion obtenu à partir des bilans de masse, de taux d’humidité et d’énergie est proposé. Ce modèle exprime le transport de la matière et de la chaleur dans une extrudeuse par des systèmes d’équations hyperboliques définis sur deux domaines complémentaires variant dans le temps. L’évolution des domaines est dictée par une Equation aux Dérivées Ordinaires (EDO) issue du bilan de masse total dans une extrudeuse. Par le principe des applications contractantes l

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32

Moumeni, Abdelkader. "Étude d'un problème de perturbations singulières à propos d'une équation d'évolution non classique." Nancy 1, 1992. http://www.theses.fr/1992NAN10105.

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Dans ce travail, l'étude porte sur l'existence, et le comportement asymptotique, de la solution d'un problème d'évolution non classique qui entre dans la catégorie des problèmes dits problèmes de perturbations singulières, avec des conditions aux bords non usuelles. Ce problème régit les petites oscillations d'un système élastique constitué de deux milieux en interaction. Par exemple, une membrane élastique rectangulaire, fixée sur trois de ses cotés, le quatrième coté étant solidaire d'une tige élastique. On suppose que l'inertie de la membrane est négligeable par rapport à celle de la tige e

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33

Rosales, de Cáceres José J. "On the effect of the Sun's gravity around the Earth-Moon L1 and L2 libration points." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/670809.

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In this thesis we explored some aspects of the dynamics around the Earth-Moon L1 and L2 points in the context of two Restricted Four Body Problems: the Bicircular Problem (BCP) and the Quasi-bicircular Problem (QBCP). Both the BCP and QBCP model the dynamics of a massless particle moving under the influence of the Sun, Earth, and Moon. Although these two models focus on the same system, it is relevant to study both because their behavior around the L2 is qualitatively different.Ðhese two models can be written in the Hamiltonian formalism as periodic time-dependent perturbations of the RTBP. To

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34

Jurkiewicz, Samuel. "Theorie des graphes : cycles hamiltoniens, coloration d'aretes et problemes de pavages." Paris 6, 1996. http://www.theses.fr/1996PA066206.

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Ce travail aborde dans trois parties trois problemes de la theorie des graphes. Dans la premiere partie, cycles hamiltoniens et graphes planaires, nous developpons une procedure de construction de certaines familles de graphes planaires 3-connexes, hamiltoniens et non hamiltoniens. Ces graphes echappent aux caracterisations donnees par les theoremes de tutte et whitney d'une part (conditions suffisantes) et par le theoreme de grinberg d'autre part (conditions necessaires). Cette procedure s'avere utile pour la production d'exemples de graphes en vue de tester des heuristiques pour trouver des

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35

Becker, Kai Helge. "Twin-constrained Hamiltonian paths on threshold graphs : an approach to the minimum score separation problem." Thesis, London School of Economics and Political Science (University of London), 2010. http://etheses.lse.ac.uk/3209/.

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The Minimum Score Separation Problem (MSSP) is a combinatorial problem that has been introduced in JORS 55 as an open problem in the paper industry arising in conjunction with the cutting-stock problem. During the process of producing boxes, áat papers are prepared for folding by being scored with knives. The problem is to determine if and how a given production pattern of boxes can be arranged such that a certain minimum distance between the knives can be kept. While it was originally suggested to analyse the MSSP as a specific variant of a Generalized Travelling Salesman Problem, the thesis

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36

Manukure, Solomon. "Hamiltonian Formulations and Symmetry Constraints of Soliton Hierarchies of (1+1)-Dimensional Nonlinear Evolution Equations." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6310.

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We derive two hierarchies of 1+1 dimensional soliton-type integrable systems from two spectral problems associated with the Lie algebra of the special orthogonal Lie group SO(3,R). By using the trace identity, we formulate Hamiltonian structures for the resulting equations. Further, we show that each of these equations can be written in Hamiltonian form in two distinct ways, leading to the integrability of the equations in the sense of Liouville. We also present finite-dimensional Hamiltonian systems by means of symmetry constraints and discuss their integrability based on the existence of suf

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37

Barrow-Green, June. "Poincaré and the three body problem." n.p, 1993. http://ethos.bl.uk/.

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38

Colombo, Jones. "O problema da reconstrução dos torneios com quociente simples normal." [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306862.

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Orientador: Claudina Izepe Rodrigues<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica<br>Made available in DSpace on 2018-07-26T16:45:39Z (GMT). No. of bitstreams: 1 Colombo_Jones_M.pdf: 6336447 bytes, checksum: 620030ff0cb706f37ef7c0f7947b0631 (MD5) Previous issue date: 2000<br>Resumo: Neste trabalho, o objetivo foi o de estudar o problema da reconstrução para torneios com o quociente simples normal. Com este intuito, introduzimos e desenvolvemos no capítulo 1 diversos conceitos, tais como, o quociente de um torneio

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39

Benner, P., V. Mehrmann, and H. Xu. "A numerically stable, structure preserving method for computing the eigenvalues of real Hamiltonian or symplectic pencils." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800915.

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A new method is presented for the numerical computation of the generalized eigen- values of real Hamiltonian or symplectic pencils and matrices. The method is strongly backward stable, i.e., it is numerically backward stable and preserves the structure (i.e., Hamiltonian or symplectic). In the case of a Hamiltonian matrix the method is closely related to the square reduced method of Van Loan, but in contrast to that method which may suffer from a loss of accuracy of order sqrt(epsilon), where epsilon is the machine precision, the new method computes the eigenvalues to full possible accuracy.

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40

Xie, Zhifu. "On the N-body Problem." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1444.pdf.

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41

Wang, Bin. "Rainbow structures in properly edge-colored graphs and hypergraph systems." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASG016.

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La combinatoire extrémale est l'une des branches les plus vigoureuses des mathématiques combinatoires au cours des dernières décennies, et elle a été largement utilisée en informatique, en conception de réseaux et en conception de codage. Elle se concentre sur la détermination de la taille maximale ou minimale possible de certaines structures combinatoires, sous certaines conditions ou contraintes. Les ensembles hôtes peuvent être des graphes, des digraphes, des graphes aléatoires, des hypergraphes, des entiers, des nombres premiers, des ensembles, des graphes avec arêtes colorées, etc. Les st

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42

Gadea, Florent Xavier. "Theorie des hamiltoniens effectifs : applications aux problemes de diabatisation et de collision reactive." Toulouse 3, 1987. http://www.theses.fr/1987TOU30276.

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Etude approfondie sur la theorie des hamiltoniens effectifs et analyse de leurs applications aux methodes de diabatisation et au traitement des collisions reactives. Propositions pour le calcul des valeurs propres de l'hamiltonien par des methodes de perturbation ou iteratives, pour l'emploi d'hamiltoniens effectifs dans le calcul des surfaces quasi diabatiques et le traitement general des collisions reactives. Application a la reaction cs+h::(2) etudiee par les methodes ab initio pour la geometrie colineaire : surfaces de potentiel, sections efficaces et mecanismes predominants

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Gadea, Florent Xavier. "Théorie des hamiltoniens effectifs applications aux problèmes de diabatisation et de collision réactive /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37605246f.

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Oda, Eduardo. "Fenômeno Fuller em problemas de controle ótimo: trajetórias em tempo mínino de veículos autônomos subaquáticos." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/45/45132/tde-05052009-111117/.

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As equações do modelo bidimensional de veículos autônomos subaquáticos fornecem um exemplo de sistema de controle não linear com o qual podemos ilustrar propriedades da teoria de controle ótimo. Apresentamos, sistematicamente, como os conceitos de formalismo hamiltoniano e teoria de Lie aparecem de forma natural neste contexto. Para tanto, estudamos brevemente o Princípio do Máximo de Pontryagin e discutimos características de sistemas afins. Tratamos com cuidado do Fenômeno Fuller, fornecendo critérios para decidir quando ele está ou não presente em junções, utilizando para isso uma linguage

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Gigola, Silvia Viviana. "Optimización del problema de valor propio inverso para matrices estructuradas." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/106367.

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Un área importante de la Matemática Aplicada es el Análisis Matricial dado que muchos problemas pueden reformularse en términos de matrices y de así facilitar su resolución. El problema de valor propio inverso consiste en la reconstrucción de una matriz a partir de datos espectrales dados. Este tipo de problemas se presenta en diferentes áreas de la ingeniería y surge en numerosas aplicaciones. En esta tesis se resuelve el problema de valor propio inverso para tres tipos específicos de matrices. Los problemas de valores propios inversos han sido estudiados tanto desde los puntos de vista teóri

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46

Castan, Thibaut. "Stability in the plane planetary three-body problem." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066062/document.

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Arnold a démontré l'existence de solutions quasipériodiques dans le problème planétaire à trois corps plan, sous réserve que la masse de deux des corps, les planètes, soit petite par rapport à celle du troisième, le Soleil. Cette condition de petitesse dépend de façon cachée de la largeur d'analyticité de l'hamiltonien du problème, dans des coordonnées transcendantes. Hénon ex- plicita un rapport de masses minimal nécessaire à l'application du théorème de Arnold. L'objectif de cette thèse sera de donner une condition suffisante sur les rapports de masses. Une première partie de mon travail con

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Bonomo, Wescley. "Contribuições para o estudo do centralizador de fluxos, Hamiltonianos e ações de IR^n." Instituto de Matemática. Departamento de Matemática, 2016. http://repositorio.ufba.br/ri/handle/ri/22839.

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Submitted by Santos Davilene (davilenes@ufba.br) on 2017-06-01T20:01:50Z No. of bitstreams: 1 Tese - Wescley.pdf: 2339393 bytes, checksum: 22bfa3dae7b30d963d35d1f54414a3df (MD5)<br>Approved for entry into archive by Vanessa Reis (vanessa.jamile@ufba.br) on 2017-06-07T11:19:46Z (GMT) No. of bitstreams: 1 Tese - Wescley.pdf: 2339393 bytes, checksum: 22bfa3dae7b30d963d35d1f54414a3df (MD5)<br>Made available in DSpace on 2017-06-07T11:19:46Z (GMT). No. of bitstreams: 1 Tese - Wescley.pdf: 2339393 bytes, checksum: 22bfa3dae7b30d963d35d1f54414a3df (MD5)<br>O conteúdo desta Tese está relacionado

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Pérez, Rodríguez Jeinny Nallely. "A study of the problem of time in a Friedmann quantum cosmology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21716/.

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After reviewing Dirac's canonical quantization program and the canonical quantization of General Relativity, we study the problem of time in the context of a quantum minisuperspace cosmological model: a Friedmann-Lemaître-Robertson-Walker spacetime coupled minimally to a scalar field. We explore different methods to include time and evolution in our formalism. We begin by discussing the possibility to identify a dynamical time variable before quantization. Such a time variable is constructed as a function of the phase space variables and leads to a multiple choice problem for the evolution of

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Holtz, Susan Lady. "Liouville resolvent methods applied to highly correlated systems." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49795.

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Armstrong, Craig Keith. "Hamilton-Jacobi Theory and Superintegrable Systems." The University of Waikato, 2007. http://hdl.handle.net/10289/2340.

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Hamilton-Jacobi theory provides a powerful method for extracting the equations of motion out of some given systems in classical mechanics. On occasion it allows some systems to be solved by the method of separation of variables. If a system with n degrees of freedom has 2n - 1 constants of the motion that are polynomial in the momenta, then that system is called superintegrable. Such a system can usually be solved in multiple coordinate systems if the constants of the motion are quadratic in the momenta. All superintegrable two dimensional Hamiltonians of the form H = (p_x)sup2 + (p_y)sup2 + V

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