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Ara es mostren els items 21-30 de 30

    • Pseudo-normal form near saddle-center or saddle-focus equilibria 

      Delshams Valdés, Amadeu; Lázaro Ochoa, José Tomás (2003)
      Article
      Accés obert
      In this paper we introduce the pseudo-normal form, which generalizes the notion of normal form around an equilibrium. Its convergence is proved for a general analytic system in a neighborhood of a saddle-center or a ...

    • Pseudo-normal forms and their applications 

      Delshams Valdés, Amadeu; Lázaro Ochoa, José Tomás (2001)
      Article
      Accés obert

    • Rational parameterizations approach for solving equations in some dynamical systems problems 

      Lázaro Ochoa, José Tomás; Gasull Embid, Armengol; Torregrosa Arús, Joan (2019-08)
      Article
      Accés obert
      We show how the use of rational parameterizations facilitates the study of the number of solutions of many systems of equations involving polynomials and square roots of polynomials. We illustrate the effectiveness of this ...

    • Semiclassical quantification of some two degree of freedom potentials: A differential Galois approach 

      Acosta Humánez, Primitivo Belen; Lázaro Ochoa, José Tomás; Pantazi, Chara; Morales Ruiz, Juan José (2024-01-01)
      Article
      Accés obert
      In this work we explain the relevance of the Differential Galois Theory in the semiclassical (or WKB) quantification of some two degree of freedom potentials. The key point is that the semiclassical path integral quantification ...

    • Semiclassical theory predicts stochastic ghosts scaling 

      Lázaro Ochoa, José Tomás; Sardanyes Cayuela, Josep; Alarcón, Tomás; Peña Garay, Carlos (Royal Society, 2023-05)
      Article
      Accés restringit per política de l'editorial
      Slowing down occurs in dynamical systems close to bifurcations or phase transitions. The time length (t) of ghost transients close to a saddle-node bifurcation in deterministic systems follows t~|¿-¿c|-1/2, ¿ being the ...

    • Teoria d'àlgebra lineal numèrica 

      Lázaro Ochoa, José Tomás; Ollé Torner, Mercè; Pacha Andújar, Juan Ramón (Universitat Politècnica de Catalunya, 2019-02-28)
      Apunts
      Accés obert

    • Tesi doctoral: "On normal forms and splitting of separatrices in reversible systems" 

      Lázaro Ochoa, José Tomás (2003)
      Working paper
      Accés obert

    • Upper bounds for the number of zeroes for some Abelian Integrals 

      Lázaro Ochoa, José Tomás; Gasull Embid, Armengol; Torregrosa, Joan (2012-01-12)
      Report de recerca
      Accés obert
      Abstract. Consider the vector field x0 = -yG(x, y), y0 = xG(x, y), where the set of critical points {G(x, y) = 0} is formed by K straight lines, not passing through the origin and parallel to one or two orthogonal ...

    • Upper bounds for the number of zeroes for some Abelian integrals 

      Gasull Embid, Armengol; Lázaro Ochoa, José Tomás; Torregrosa, Joan (2012-09)
      Article
      Accés restringit per política de l'editorial
      Consider the vector field x′=−yG(x,y),y′=xG(x,y), where the set of critical points {G(x,y)=0} is formed by K straight lines, not passing through the origin and parallel to one or two orthogonal directions. We perturb it ...

    • Viral replication modes in single-peak fitness landscapes: A dynamical systems analysis 

      Forners, Joan; Lázaro Ochoa, José Tomás; Alarcón, Tomás; Elena, Santiago F.; Sardanyes, Josep (2019-01-07)
      Article
      Accés obert
      Positiv e-sense, single-stranded RN A viruses are im portant pathogens infecting almost all types of organ- isms. Experimental evidence from distributions of mutations and from viral RN A ampli¿cation suggest that these ...