Exploració per tema "Dynamical systems"
Ara es mostren els items 21-40 de 81
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De la mecànica celeste als sistemes dinàmics: un camí d'anar i tornar
(2006-05-17)
Audiovisual
Accés obertLa Mecànica Celeste estudia el moviment dels astres i, en general, tot tema relacionat amb el problema dels N cossos i les seves aplicacions a la ciència espacial. Podem considerar que el seu origen remot és el coneixement ... -
Detection of Lagrangian Coherent Structures in oceanic flows
(Universitat Politècnica de Catalunya, 2021-07)
Projecte Final de Màster Oficial
Accés obertThe Atlantic Meridional Overturning Circulation (AMOC) is a complex system of shallow and deep currents in the Atlantic Ocean which plays a crucial role in the regulation of the Earth's climate. Lagrangian Coherent Structures ... -
Differentiable invariant manifolds for partially hyperbolic tori and a lambda lemma
(2000)
Article
Accés obertWe consider differentiable maps having an invariant torus with normal behavior having a central part. We prove the existence and regularity of pseudostable manifolds and regularity with respect to parameters. Then we ... -
Dynamics and bifurcation near the transition from stability to complex instability
(2001)
Article
Accés obert -
Effective stability in reversible systems
(1997)
Article
Accés obertIn this paper we present a procedure to put in normal form a nearly-integrable reversible system, not necessarily a Hamiltonian system. Furthermore, non-resonant stability estimates are obtained. As an application we discuss ... -
El problema dels deu Martinis
(2005-03-09)
Audiovisual
Accés obert"El problema dels 10 martinis fou plantejat el 1981 pel matemàtic Marc Kac i es pregunta per l'estructura cantoriana de l'espectre de l’operador «almost Mathieu» o de Harper. En aquesta xerrada exposarem les motivacions ... -
Emotional inertia: a key to understanding psychotherapy process and outcome
(2014-09-01)
Article
Accés restringit per política de l'editorialThe processes underlying psychotherapeutic change have increasingly been emphasized in both research and clinical practice. Nonlinear dynamical systems theory (NDS) offers a transdisciplinary scientific approach to the ... -
Empirical gramians and balanced truncation for model reduction of nonlinear systems
(2007-10)
Presentació
Accés obert -
Existence of invariant tori in skew-product systems: A computer assisted approach
(Universitat Politècnica de Catalunya, 2020-01)
Projecte Final de Màster Oficial
Accés obertThis work is a computer assisted approach to the study of invariant manifolds in skew-product dynamical systems. More specifically, the existence of an invariant tori under a quasi-periodic perturbation of our system. The ... -
Exponential decay in one-dimensional porous-thermo-elasticity
(2004)
Article
Accés obertThis paper concerns the one dimensional problem of the porous-thermo-elasticity. Two kinds of dissipation process are considered: the viscosity type in the porous structure and the thermal dissipation. It is known that ... -
Exponential stability in thermoelasticity with microtemperatures
(2003)
Article
Accés obertThis article is concerned with a linear theory for elastic materials with inner structure, whose particles in addition to the classical displacement, possess microtemperatures. In the main part of the paper we restrict ... -
General dynamics of pulsed digital oscillators
(IEEE, 2008-02-08)
Article
Accés obertThe objective of this work is to analyze pulsed digital oscillators (PDOs), as dynamical systems. It is proved that under some conditions, the bitstream at the output of the oscillator is that of the sign of a sampled ... -
Hamiltonian systems with orbits covering densely submanifolds of small codimension
(2000)
Article
Accés obertThe existence of a transition chain in a Hamiltonian system leads to the existence of orbits shadowing it, if some lambda lemma can be applied. This fact has been used to prove the existence of diffusion in perturbations ... -
High order dynamical systems approaches for low-thrust station-keeping of libration point orbits
(2022-01-01)
Article
Accés obertWe derive two families of low-thrust station-keeping control procedures based on the dynamical properties of the phase space near libration point orbits. The first family is obtained as the limit of impulsive maneuvers, ... -
Homoclinic orbits to invariant tori in Hamiltonian systems
(1998)
Article
Accés obertWe consider a perturbation of an integrable Hamiltonian system which possesses invariant tori with coincident whiskers (like some rotators and a pendulum). Our goal is to measure the splitting distance between the perturbed ... -
Horseshoe periodic orbits for saturn coorbital satellites
(2000)
Article
Accés obertWe consider the motion of coorbital satellites in the framework of the Restricted Three-Body problem for u=6.5*10^(-9). We show a mechanism to generate horsehoe periodic orbits and we compute some families of horseshoe ... -
Integrable systems on singular symplectic manifolds: from local to global
(2021-02-03)
Report de recerca
Accés obertIn this article, we consider integrable systems on manifolds endowed with symplectic structures with singularities of order one. These structures are symplectic away from a hypersurface where the symplectic volume goes ... -
Kolmogorov Theorem Revisited
(2004)
Report de recerca
Accés obertKolmogorov Theorem on the persistence of invariant tori of real analytic Hamiltonian systems is revisited. In this paper we are mainly concerned with the lower bound on the constant of the Diophantine condition required ... -
A la recerca de l'estabilitat efectiva dels asteroids trojans : algunes idees constructives de tècniques KAM sense ssar coordenades acció-angle
(2000)
Text en actes de congrés
Accés obertXerrada pel Seminari de Sistemes Dinamics UB-UPC. Barcelona, dimecres 19 de gener de 2000. Els trojans son una familia d'asteroids amb orbites situades no molt lluny del punt $L_5$ del sistema Sol-Jupiter. Si integrem ... -
Lindstedt series for lower dimensional tori
(1995)
Article
Accés obertWe consider the existence and effective computation of low-dimensional (less independent frequencies than degrees of freedom) invariant tori of a near-integrable system. Lindstedt method is a systematic procedure to compute ...
