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Статті в журналах з теми "Système linéaire non stationnaire"
Abbassi, Noufel, Stéphane Derrode, François Desbouvies, and Yohann Petetin. "Filtrage statistique optimal rapide dans des systèmes linéaires à sauts non stationnaires." Traitement du signal 31, no. 3-4 (October 28, 2014): 339–61. http://dx.doi.org/10.3166/ts.31.339-361.
Повний текст джерелаAdlouni, Salaheddine El, and Taha B. M. J. Ouarda. "Comparaison des méthodes d’estimation des paramètres du modèle GEV non stationnaire." Revue des sciences de l'eau 21, no. 1 (April 29, 2008): 35–50. http://dx.doi.org/10.7202/017929ar.
Повний текст джерелаAttaoui, Abdelatif. "Étude d'un système non linéaire de Boussinesq–Stefan." Comptes Rendus Mathematique 347, no. 1-2 (January 2009): 39–44. http://dx.doi.org/10.1016/j.crma.2008.11.004.
Повний текст джерелаZhou, Feng. "Solutions périodiques d'un système d'équations non linéaire semi-coercif." Bulletin de la Classe des sciences 5, no. 7 (1994): 345–54. http://dx.doi.org/10.3406/barb.1994.27564.
Повний текст джерелаHanouzet, Bernard, and Philippe Huynh. "Approximation par relaxation d'un système de Maxwell non linéaire." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 330, no. 3 (February 2000): 193–98. http://dx.doi.org/10.1016/s0764-4442(00)00129-4.
Повний текст джерелаFeireisl, Eduard, and Geoffrey O'Dowd. "Stabilisation d'un système hybride par un feedback non linéaire, non monotone." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 326, no. 3 (February 1998): 323–27. http://dx.doi.org/10.1016/s0764-4442(97)82988-6.
Повний текст джерелаBlanchard, Dominique, and Olivier Guibé. "Existence d'une solution pour un système non linéaire en thermoviscoélasticité." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 325, no. 10 (November 1997): 1125–30. http://dx.doi.org/10.1016/s0764-4442(97)88718-6.
Повний текст джерелаGuibé, Olivier. "Solutions entropiques et renormalisées pour un système non linéaire couplé." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 326, no. 6 (March 1998): 685–90. http://dx.doi.org/10.1016/s0764-4442(98)80031-1.
Повний текст джерелаLicois, Jean-René. "Comportement asymptotique des solutions d'un système elliptique conservatif non linéaire." Annali di Matematica Pura ed Applicata 172, no. 1 (December 1997): 125–63. http://dx.doi.org/10.1007/bf01782610.
Повний текст джерелаBenabas, Mourad. "Étude d'un système différentiel non linéaire régissant un phénomène gyroscopique forcé." Colloquium Mathematicum 70, no. 1 (1996): 41–58. http://dx.doi.org/10.4064/cm-70-1-41-58.
Повний текст джерелаДисертації з теми "Système linéaire non stationnaire"
Lahaye, Sébastien. "Contribution à l'étude des systèmes linéaires non stationnaires dans l'algèbre des dioïdes." Angers, 2000. http://www.theses.fr/2000ANGE0028.
Повний текст джерелаDiscrete event dynamic systems involving synchronization nd saturation phenomena can be modeled by linear equations in some dioids. Starting from this property a so-called linear system theory in dioids, which presents great analogies of form with the classical linear system theory, has been developed. This report is devoted to the study of non stationary linear systems in dioids. As in conventional system theory, one can claim that the non-stationary nature of a system is induced by possible variations of its state-space realization parameters. We tackle the problems of representation for these systems (input-output representation and state-space representation). A control problem, more precisely the output tracking problem, is solved. We also study a subclass of non stationary linear systems as a guideline, an analyses proper to linear periodic systems in dioids is proposed. In addition, two Petri nets subclasses have been defined in order to characterize ((max, +) and (min, +) non stationary linear systems. The proposed results find some applications in production control, notably for the just-in-time production control of workshops, as well as for the simulation and the performance evaluation of assembly lines
Nguyên, Thùy Liên. "Quelques problèmes variationnels issus de la théorie des ondes non-linéaires." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1386/.
Повний текст джерелаThis thesis focuses on the study of special solutions (traveling wave and standing wave type) for nonlinear dispersive partial differential equations in R^N. The considered problems have a variational structure, the solutions are critical points of some functionals. We demonstrate the existence of critical points using minimization methods. One of the main difficulties comes from the lack of compactness. To overcome this, we use some recent improvements of P. -L. Lions concentration-compactness principle. In the first part of the dissertation, we show the existence of the least energy solutions to quasi-linear elliptic equations in R^N. We generalize the results of Brézis and Lieb in the case of the Laplacian, and the results of Jeanjean and Squassina in the case of the p-Laplacian. In the second part, we show the existence of subsonic travelling waves of finite energy for a Gross-Pitaevskii-Schrödinger system which models the motion of a non charged impurity in a Bose-Einstein condensate. The obtained results are valid in three and four dimensional space
Tordeux, Antoine. "Étude de processus en temps continu modélisant l'écoulement de flux de trafic routier." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00596941.
Повний текст джерелаEl, Akchioui Nabil. "Fluidification des réseaux de Petri stochastiques : application aux études de fiabilité des systèmes." Le Havre, 2012. http://www.theses.fr/2012LEHA0014.
Повний текст джерелаReliability analysis based on discrete event systems and particularly on stochastic Petri nets, improves the safety of industrial processes and systems. For large scale systems, the fluidification of stochastic processes is useful to reduce the computational resources and also the duration of simulations. But global and direct fluidification that preserves the structure and the parameters of the original model leads to a biased estimation of the reliability indicators. This study explores innovative approaches to fluidify stochastic Petri nets. When the marking space has several regions, piecewise constant continuous Petri nets are introduced to divide the marking trajectory into several phases in order to reach a steady state identical with the steady state of the stochastic process. Homothetic and projective transformations are also proposed to reach a steady state that is partially homothetic to the one of the stochastic process. Finally, adaptive modifications of the parameters are used to correct progressively the mean marking. All proposed results contribute to design fluid models with asymptotic behaviours equivalent to the ones of a stochastic process
Garcia, Iturricha Aitor. "Analyse et commande CRONE de systèmes linéaires non stationnaires." Bordeaux 1, 2001. http://www.theses.fr/2001BOR12393.
Повний текст джерелаThis work deals with the extension of CRONE Control (robust control method based on fractional calculus) to the control fo time-varying systems such as time-varying systems with periodic coefficients and time-varying systems with asymptotically constant coefficients. These extensions, carried out both in the continuous and in the discret-time domain, have been feasible thanks to the representations of the considered systems using time-varying p-transfer functions (for continuous-time systems) and z-transfer functions (for discrete-time systems). These representations have also allowed to extend several well-known theorems such as initial and final value theorems to time-varying systems and have also allowed several extensions of Nyquist theorem. Each theorem and each extension fo CRONE control carried out in this work has been validated through their application to control of a testing bench with two DC motors
Le, Ber Catherine. "Simulation sur ordinateur d'un système linéaire continu et stationnaire." Brest, 1988. http://www.theses.fr/1988BRES2020.
Повний текст джерелаPerruquetti, Wilfrid. "Sur la stabilité et l'estimation des comportements non linéaires non stationnaires perturbés." Lille 1, 1994. http://www.theses.fr/1994LIL10049.
Повний текст джерелаBen, slimene Byrame. "Comportement asymptotique des solutions globales pour quelques problèmes paraboliques non linéaires singuliers." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD059/document.
Повний текст джерелаIn this thesis, we study the nonlinear parabolic equation ∂ t u = ∆u + a |x|⎺⥾ |u|ᵅ u, t > 0, x ∈ Rᴺ \ {0}, N ≥ 1, ⍺ ∈ R, α > 0, 0 < Ƴ < min(2,N) and with initial value u(0) = φ. We establish local well-posedness in Lq(Rᴺ) and in Cₒ(Rᴺ). In particular, the value q = N ⍺/(2 − γ) plays a critical role.For ⍺ > (2 − γ)/N, we show the existence of global self-similar solutions with initial values φ(x) = ω(x) |x|−(2−γ)/⍺, where ω ∈ L∞(Rᴺ) is homogeneous of degree 0 and ||ω||∞ is sufficiently small. We then prove that if φ(x)∼ω(x) |x| ⎺(²⎺⥾)/⍺ for |x| large, then the solution is global and is asymptotic in the L∞-norm to a self-similar solution of the nonlinear equation. While if φ(x)∼ω(x) |x| (x)|x|−σ for |x| large with (2 − γ)/α < σ < N, then the solution is global but is asymptotic in the L∞-norm toe t(ω(x) |x|−σ). The equation with more general potential, ∂ t u = ∆u + V(x) |u|ᵅ u, V(x) |x |⥾ ∈ L∞(Rᴺ), is also studied. In particular, for initial data φ(x)∼ω(x) |x| ⎺(²⎺⥾)/⍺, |x| large , we show that the large time behavior is linear if V is compactly supported near the origin, while it is nonlinear if V is compactly supported near infinity. we study also the nonlinear parabolic system ∂ t u = ∆u + a |x|⎺⥾ |v|ᴾ⎺¹v, ∂ t v = ∆v + b |x|⎺ ᴾ |u|q⎺¹ u, t > 0, x ∈ Rᴺ \ {0}, N ≥ 1, a,b ∈ R, 0 < y < min(2,N)? 0 < p < min(2,N), p,q > 1. Under conditions on the parameters p, q, γ and ρ we show the existence and uniqueness of global solutions for initial values small with respect of some norms. In particular, we show the existence of self-similar solutions with initial value Φ = (φ₁, φ₂), where φ₁, φ₂ are homogeneous initial data. We also prove that some global solutions are asymptotic for large time to self-similar solutions. As a second objective we consider the nonlinear heat equation ut = ∆u + |u|ᴾ⎺¹u - |u| q⎺¹u, where t ≥ 0 and x ∈ Ω, the unit ball of Rᴺ, N ≥ 3, with Dirichlet boundary conditions. Let h be a radially symmetric, sign-changing stationary solution of (E). We prove that the solution of (E) with initial value λ h blows up in finite time if |λ − 1| > 0 is sufficiently small and if 1 < q < p < Ps = N+2/N−2 and p sufficiently close to Ps. This proves that the set of initial data for which the solution is global is not star-shaped around 0
Przybylski, C. "Sur la réduction structurelle des systèmes continus non linéaires à coefficients presque périodiques." Lille 1, 1986. http://www.theses.fr/1986LIL10140.
Повний текст джерелаOlech, Michał. "Systèmes d'évolution non linéaires et leurs applications." Paris 11, 2007. http://www.theses.fr/2007PA112250.
Повний текст джерелаThe first part is devoted to the analysis of two mean-field problems describing particles which interact with themselves either by electrical or gravitational forces. We first investigate steady state solutions for a problem with gravitational forces. We use methods of ordinary differential equations as well as variational methods to obtain the uniqueness and existence of many stationary solutions. Using methods of functional analysis, ordinary differential equations and fixed point theorems, we then prove the existence of global in time solutions of a system of partial differential equations describing the time evolution of a cloud of electrically charged particles. Moreover, we describe the large time behavior of solutions as t tends to infinity. We are especially interested in the two-dimensional case, when the system is considered in the whole space R^2. We show that in the case of small initial conditions the large time behavior of the solutions much differs from that in the higher-dimensional case. The second part involves a nonlinear parabolic reaction-diffusion system which both includes a linear model for intercellular transport in eukarya, and a reversible chemical reaction. We prove a contraction property in L^1 for the semigroup associated with the system. Then, using a Lyapunov functional, we show the convergence of the solutions to suitable steady states as t tends to infinity. In the linear case we prove the existence and uniqueness of stationary solutions in space dimensions 1, 2, 3 and 4. In the last chapter we investigate a numerical finite volume scheme for the nonlinear system modeling fast reversible chemical reactions. For the convergence proof we search for discrete versions of standard a priori estimates, comparison principles and compactness theorems. Moreover, we perform numerical experiments for the concrete example of a real chemical reaction
Книги з теми "Système linéaire non stationnaire"
Isidori, Alberto. Nonlinear control systems. 3rd ed. Berlin: Springer, 1995.
Знайти повний текст джерелаNonlinear control systems: An introduction. 2nd ed. Berlin: Springer-Verlag, 1989.
Знайти повний текст джерелаNonlinear control systems: An introduction. Berlin: Springer-Verlag, 1985.
Знайти повний текст джерелаBifurcation of extremals in optimal control. Berlin: Springer-Verlag, 1986.
Знайти повний текст джерелаMartin, Nadine, and Christian Doncarli. Décision dans le plan temps-fréquence. Paris: Hermès Science publications, 2004.
Знайти повний текст джерелаCharru, Franc ʹois. Instabilite s hydrodynamiques. Les Ulis, France: EDP Sciences, 2007.
Знайти повний текст джерелаV, Zhitarashu N., ed. Parabolic boundary value problems. Basel: Birkhäuser Verlag, 1998.
Знайти повний текст джерелаIsidori, Alberto. Nonlinear Control Systems: An Introduction (Lecture Notes in Control and Information Sciences). Springer, 1986.
Знайти повний текст джерелаIsidori, Alberto. Nonlinear Control Systems: An Introduction (Communications and Control Engineering). 2nd ed. Springer, 1994.
Знайти повний текст джерелаEidelman, Samuil D., and Nicolae V. Zhitarashu. Parabolic Boundary Value Problems (Operator Theory: Advances and Applications). Birkhauser, 1999.
Знайти повний текст джерелаЧастини книг з теми "Système linéaire non stationnaire"
Gagey, Pierre Marie. "Système d’aplomb, système dynamique non linéaire." In Guide de Posturologie, 215–19. Elsevier, 2017. http://dx.doi.org/10.1016/b978-2-294-74719-9.00013-5.
Повний текст джерела