ingleseENG
Direttore Vicario: Prof. Gabriele Grillo
Responsabile Gestionale: Dr.ssa Franca Di Censo

 Seminari

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Prossimi Seminari

  • Dealing with unreliable computing platforms at extreme scale
    Luc Giraud, INRIA (Inria Bordeaux – Sud-Ouest)
    mercoledì 23 gennaio 2019 alle ore 14:00, Aula Consiglio VII Piano – Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
  • Poroelasticity: Discretizations and fast solvers based on geometric multigrid methods
    Francisco José Gaspar Lorenz, Department of Applied Mathematics -Zaragoza University – Spain
    giovedì 31 gennaio 2019 alle ore 14:00, Sala Consiglio VII Piano – Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
  • Application of Polyconvexity and multivariable convexity of energy potentials in nonlinear solid mechanics
    Javier Bonet, University of Greenwich
    giovedì 14 febbraio 2019 alle ore 14:00, Aula Consiglio VII Piano – Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO

Seminari Passati

  • Difetti in cristalli liquidi e proteine in membrane lipidiche: analisi variazionale dei sistemi complessi
    Paolo Biscari, Dip. di Matematica del Politecnico di Milano
    mercoledì 1 ottobre 2003
  • Implicit-Explicit Runge-Kutta schemes and applications to hyperbolic systems with relaxation
    Giovanni Russo, Dipartimento di Matem. – Univ. di Catania
    martedì 30 settembre 2003 alle ore 11:00, Aula Seminari MOX – 6° piano dip. di Matematica
    ABSTRACT
    We consider implicit-explicit (IMEX) Runge Kutta methods for
    hyperbolic systems of conservation laws with stiff relaxation
    terms. Here we restrict our analysis to diagonally implicit Runge
    Kutta (DIRK) schemes and consider schemes that are asymptotic
    preserving (AP) and strong-stability-preserving (SSP) in the zero
    relaxation limit. Accuracy and stability properties of these
    schemes are studied both analytically and numerically. The IMEX
    schemes are then combined with a weighted essentially non
    oscillatory (WENO) finite difference strategy in space to obtain
    fully discrete high order schemes. Several applications to
    hyperbolic relaxation systems in stiff and non stiff regimes show
    the efficiency and the robustness of the present approach.

  • Emumerative problems inspired by Mayer’s theory of cluster integrals in thermodynamics.
    Pierre Leroux, Université du Québec a Montréal
    venerdì 26 settembre 2003 alle ore 11:30, Dipartimento di Matematica – Politecnico di Milano
  • Ferromagnetic and Anti-Ferromagnetic Systems
    Jalal Shatah, Courant Institute of Mathematical Sciences, NY (U.S.A.)
    martedì 23 settembre 2003 alle ore 17:00, Dipartimento di Matematica – Università degli Studi di Milano – Via Saldini 50 – Milano – Sala di Rappresentanza
    ABSTRACT
    Dispersive geometric evolution equations have received much attention in the past few decades. Some of these equations describe the dynamics of micromagnetics, vortex motion in liquid crystals, or vibrations of certain crystalline lattices. In this talk we will present some recent results on the equations describing ferromagnetic and anti-ferromagnetic materials concerning existence of solutions and the relation between anti-ferromagnetic equations (Schrodinger maps) and wave maps.
  • Equazioni di Volterra stocastiche
    Stefano Bonaccorsi, Universita di Trento
    lunedì 22 settembre 2003 alle ore 15:00, Dipartimento di Matematica
  • Differential Geometry and the Control of Nonlinear Systems
    Kurt Schlacher, Johannes Kepler Universität, Linz (Austria)
    lunedì 22 settembre 2003 alle ore 17:00, Dipartimento di Matematica – Università degli Studi di Milano – Via Saldini 50 – Milano – Sala di Rappresentanza
    ABSTRACT
    Control theory makes significant progress, since nonlinear systems and differential geometry have been brought together about 30 years ago. The main advantage is that a description of the control system is avalaible, which does not require the choice of special coordinates. Now, many important properties of dynamic systems can be characterized in a geometric way. Within this framework nonlinear systems are considered as geometric objects, defined on smooth manifolds. E.g., a nonlinear control system can be identified with a submanifold of a certain geometric structure. Non observable or non accesible systems generate a foliation, and so on. This talk gives an introduction to the geometric description of nonlinear control systems, described by a set of ordinary differential equations. It starts with a short overview, where time invariant and time variant systems with or without control input are characterized by its geometric properties. At the same time a short introduction to the required mathematical tools will be presented. Having this preliminaries at our disposal we develop the concept of accessibility and observability by geometric ideas. It will turn our that this approach is not confined to explicit systems, on the contrary it can be generalized to more complex ones. Fortunately these methods are not only useful for the analysis of systems, where equivalence means that solutions of one system can be transformed to solutions of the other and vice versa. Using the idea that a dynamic system is also a certain sybmanifold, we show that equivalent systems describe the same submanifold in different coordinates only. From a systems designer’s point of view, it is important to construct equivalent systems such that the control loop design can be reduced to an already solved problem Finally, this talk finishes with an industrial application of the present methods. The hydraulic gap control of stands in steel rolling mills is a challenging task because of the intrinsic nonlinear behaviour of these systems. We present new design ideas and controllers and prove the performance by simulations and measurements taken in mills located in the US and Europe.
  • Finite element approximation to infinite Prandtl number Boussinesq equations with temperature dependent viscosity and its application to Earth s mantle convection problem
    Masahisa TABATA, Department of Mathematical Sciences- Kyushu Univer
    giovedì 18 settembre 2003 alle ore 15:00, aula seminari MOX-6° piano dip. mat.
    ABSTRACT
    A stabilized finite element scheme for infinite Prandtl number Boussinesq
    equations with temperature dependent viscosity is analyzed.
    The domain is a spherical shell and the P1-element is employed for every
    unknown function.
    The finite element solution is proved to converge to the exact one in the
    first order of the time increment and the mesh size.
    The scheme is applied to Earth s mantle convection problems with
    viscosities strongly dependent on the temperature and some numerical
    results are shown.
  • Faà di Bruno formula and determinantal identities
    Chu Wenchang, Univ. degli Studi di Lecce
    giovedì 18 settembre 2003 alle ore 00:00, CNR, via Bassini 15, Milano