italianoITA
Head of Dept: Prof. Giulio Magli
Vice-Head of Dept: Prof. Gabriele Grillo
Department Manager: Dr.ssa Franca Di Censo

 Seminars

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Upcoming seminars

  • Dynamic prediction in Survival analysis: an application to patients with high-grade extremity soft tissue sarcoma
    Marta Fiocco, Mathematical Institute Leiden University, The Netherlands
    mercoledì 27 febbraio 2019 alle ore 11:00, Aula Seminari 'Saleri' VI Piano MOX-Dipartimento di Matematica, Politecnico di Milano - Edificio 14
  • Rigorous bounds on the heat flux in turbulent convection
    Camilla Nobili, Universität Hamburg
    mercoledì 27 febbraio 2019 alle ore 15:15, Aula seminari 3° piano
  • Optimization with expensive and uncertain data - challenges and improvements
    Coralia Cartis, Mathematical Institute, University of Oxford, UK
    giovedì 7 marzo 2019 alle ore 15:30, Aula Consiglio VII Piano - Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
  • Testing families of analytic discs
    Luca Baracco, Università di Padova
    giovedì 7 marzo 2019 alle ore 14:30 precise, Aula seminari del 3 piano
  • Tame topology and algebraic geometry
    Bruno Klingler, Humboldt Universitaet Berlino
    lunedì 11 marzo 2019 alle ore 16:30 precise, Aula Seminari 6 piano, Ed. La Nave
  • Lanford’s Theorem and the Emergence of Irreversibility
    Jos Uffink, University of Minnesota
    martedì 12 marzo 2019 alle ore 16:30 precise, Sala Consiglio, 7 piano, Ed. La Nave
  • Il futuro dell'uomo nello Spazio: Marte prossima frontiera
    Luigi Bignami, Giornalista scientifico
    mercoledì 13 marzo 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • L’avventura dell'infinitamente piccolo oltre il bosone di Higgs: LHC e i futuri super-acceleratori del CERN
    Lucio Rossi, CERN
    mercoledì 20 marzo 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Laser "su misura" per il trattamento di tumori
    Paola Saccomandi, Politecnico di Milano
    mercoledì 27 marzo 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Stima del valore aggiunto di scuola: stato dell'arte del modello INVALSI e prospettive. Quali implicazioni di policy?
    Tommaso Agasisti, Politecnico di Milano
    mercoledì 3 aprile 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • On the modelling of particle and pedestrian motion with Fokker-Planck equations
    Alfio Borzì, University of Wuerzburg -Germania-
    giovedì 4 aprile 2019 alle ore 14:00, Aula Consiglio VII Piano - Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
  • Problemi di frontiera libera nelle scienze applicate
    Sandro Salsa, Politecnico di Milano
    mercoledì 10 aprile 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Errori sistematici e confondimento degli studi osservazionali basati sui dati dal mondo reale
    Giovanni Corrao, Università degli Studi di Milano-Bicocca
    mercoledì 8 maggio 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Forma e complessità in Natura: perché il mondo è matematico?
    Pasquale Ciarletta, Politecnico di Milano
    mercoledì 15 maggio 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Matematica, società, economia e sviluppo
    Giulia di Nunno, University di Oslo
    mercoledì 22 maggio 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Comunicare il progetto. Storytelling e tecniche di rappresentazione
    Francesca Piredda, Politecnico di Milano
    mercoledì 29 maggio 2019 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Semi-implicit finite-volume integrators for all-scale atmospheric dynamics
    Piotr Smolarkiewicz, European Centre for Medium-Range Weather Forecasts, Reading, Berkshire, United Kingdom
    giovedì 30 maggio 2019 alle ore 14:00, Aula Consiglio VII Piano - Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO

Past Seminars

  • Morphology and Physiology of the tricuspid and pulmonary valves and right/left ventricular inter-relationships
    Antonio Corno, East Midlands Congenital Heart Center, UK.
    giovedì 21 febbraio 2019 alle ore 09:30, Aula Seminari III Piano del Dipartimento di Matematica, Politecnico di Milano - Edificio 14
    ABSTRACT
    The anatomy of the normal tricuspid and pulmonary valve will be explained and illustrated in all the specific elements, in order to provide the background required to then understand the mechanism of their opening and closing. The latter will be explained, with the changes over time of the pressures in the right atrium, right ventricle and pulmonary artery. The anatomical and physiological inter-relationships between right and left ventricle will be finally explained, showing why any change in the volume and/or pressure overload of one ventricle immediately reflects in the functioning of the other ventricle

    contact: christian.vergara@polimi.it

  • Physiology of the heart
    Antonio Corno, East Midlands Congenital Heart Center, UK
    martedì 19 febbraio 2019 alle ore 10:30, Aula Seminari 'Saleri' VI Piano MOX-Dipartimento di Matematica, Politecnico di Milano - Edificio 14
    ABSTRACT
    The physiology of the heart will be explained, with the changes over time of the pressures in the left atrium, left ventricle and aorta, and the mechanisms of opening and closure of mitral and aortic valve.

    Contact: christian.vergara@polimi.it
  • Morphology of the normal and pathological mitral and aortic valves
    Antonio Corno, East Midlands Congenital Heart Center, UK.
    lunedì 18 febbraio 2019 alle ore 14:00, Aula Seminari 'Saleri' VI Piano MOX-Dipartimento di Matematica, Politecnico di Milano - Edificio 14
    ABSTRACT
    The anatomy of the normal mitral valve and aortic valve will be explained and illustrated in all the specific elements, in order to provide the background required to then understand the mechanism of their opening and closing. The various types of anatomically and functionally bicuspid aortic valve will be then illustrated, with the reasons why the presence of bicuspid aortic valve is frequently associated with malfunctioning of the valve itself and also with diseases of the ascending aorta. Finally, the different mechanism involved in the congenital stenosis and/or regurgitation of the aortic valve will be explained, with the associated consequences on the left ventricular morphology and function.

    contact: christian.vergara@polimi.it
  • 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
    ABSTRACT
    The presentation will review recent advances in the area of designing and using polyconvex energy potentials to describe the behaviour of solids in the large strain regime in the presence of several physical phenomena such as thermal or electro-mechanical effects. The need for convexity will be justified from the viewpoint of ensuring the existence of real wave speeds in the material at any state of deformation. The convexity of energy potentials with respect to an extended set of variables describing deformation and other multi-physics effects enables the definition of conjugate stresses, thermal and electro-mechanical variables and the formulation of complementary energy functions via the application of the Legendre transforms. In the static case, this leads to the development of a variety of Hu-Washizu or Hellinger-Reissner mixed variation principles that permit the discretisation of different fields with specifically chosen order of accuracy. For instance, in the case of nearly and fully incompressible materials, discretisations that either meet the LBB condition or are appropriately stabilised can be constructed. In the dynamic case, first order conservation laws can be derived for each of the extended set of variables in the energy function. Moreover, convexity enables the definition of a convex entropy-like functional of the primary conserved variables, leading to a symmetrisation of the conservation laws in terms of conjugate stress-like variables and a robust implementation of a Petrov-Galerkin discretisation process. This can be done in a variety of ways, for instance in the case of thermoelasticity two approaches will be discussed, namely, using the Hamiltonian as “entropy-like” convex function or, alternatively, using the so-called “ballistic free energy” as convex entropy extension. Several examples demonstrating the theoretical developments will be provided.


    contact: luca.formaggia@polimi.it
  • Spectral synthesis for systems of exponentials and reproducing kernels
    Anton Baranov, Saint Petersburg State University
    giovedì 7 febbraio 2019 alle ore 16:00, Sala di Rappresentanza, Dipartimento di Matematica, Via C. Saldini 50, Milano
    ABSTRACT
    Let $x_n$ be a complete and minimal system of vectors in a Hilbert space $H$. We say that this system is hereditarily complete or admits spectral synthesis if any vector in $H$ can be approximated by linear combinations of partial sums of the Fourier series with respect to $x_n$. It was a long-standing problem whether any complete and minimal system of exponentials in $L^2(-a,a)$ admits spectral synthesis. Several years ago we gave a negative answer to this question. At the same time we showed that any such system admits the synthesis up to a one- dimensional defect. In the talk we will also discuss related problems for systems of reproducing kernels in Hilbert spaces of entire functions (such as Paley-Wiener, de Branges, Fock).
  • 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
    ABSTRACT
    The theory of poroelasticity models the interaction between the deformation and the fluid flow in a fluid-saturated porous medium. Poroelastic models are widely used nowadays in the modeling of many applications in different fields, ranging from geomechanics and petroleum engineer, to biomechanics. The poroelastic equations are often solved in a two-field formulation, where the unknowns are the displacement and the pressure, or in a three-field formulation where the velocity of the fluid is included as a primary variable as well. The numerical solution of these models is usually based on finite element methods. In this talk, we will study some stabilized finite element discretizations for both formulations of the poroelastic problem. Moreover, an important aspect in the numerical simulation of these problems is the efficient solution of the large systems of algebraic equations obtained after discretization. The resulting systems are of saddle point type and we will address their efficient solution by designing suitable geometric multigrid methods.

    Contact: luca.formaggia@polimi.it
  • 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
    ABSTRACT
    The advent of extreme scale computing platforms will require the use of parallel resources at an unprecedented scale. On the technological side, the continuous shrinking of transistor geometry and the increasing complexity of these devices affect dramatically their sensitivity to natural radiation leading to a high rate of hardware faults, and thus diminish their reliability. Handling fully these faults at the computer system level may have a prohibitive computational and energetic cost. High performance computing applications that aim at exploiting all these resources will thus need to be resilient. In this talk, we will first give an overview of the current trends towards exascale. We will discuss the new challenges to face in terms of platform reliability and associated variety of possible faults. We will then discuss some of the solutions that have been proposed to tackle these errors before discussing in more details some contributions in sparse numerical linear algebra. First, in the context of computing node crashes, we will discuss possible remedies in the framework of linear system or eigenproblem solutions, that are the inner most numerical kernels in many scientific and engineering applications and also ones of the most time consuming parts. Second, we will discuss a somehow more challenging problem related to silent transient soft-errors produced by natural radiation and consisting in a bit-flip in a memory cell producing unexpected results at the application level. In that context we will consider the conjugate gradient (CG) method that is the most widely used iterative scheme for the solution of large sparse systems of linear equations when the matrix is symmetric positive definite. We will investigate through extensive numerical experiments the sensitivity of of CG to bit-flips and further discuss possible numerical criteria to detect the occurrence of such faults.
    The above mentioned research activities have been conducted in collaboration with many colleagues including E. Agullo (Inria), S. Cools (University of Antwerpen), E. Fatih-Yetkin (Kadir Has University), P. Salas (CERFACS), W. Vanroose (University of Antwerpen) and M. Zounon (NAG).

    contact: luca.bonaventura@polimi.it
  • QUANTUM INCOMPATIBILITY WITNESSES
    Alessandro Toigo, Politecnico di Milano
    giovedì 17 gennaio 2019 alle ore 11:30 precise, Aula Consiglio VII piano
    ABSTRACT
    We discuss the following variant of the standard minimum error state discrimination problem: Alice picks the state she sends to Bob among one of several disjoint state ensembles, and she communicates him the chosen ensemble only at a later time. Two different scenarios then arise: either Bob is allowed to arrange his measurement set-up after Alice has announced him the chosen ensemble (pre-measurement scenario), or he is forced to perform the measurement before of Alice’s announcement (post-measurement scenario). In the latter case, he can only post-process his measurement outcome when Alice’s extra information becomes available. We demonstrate that quantum incompatibility can always be detected by means of a state discrimination task within the pre-measurement scenario. This is done by showing that only incompatible measurements allow for an efficient use of pre-measurement information in order to improve Bob’s probability of guessing the correct state. The gap between the guessing probabilities with pre- and post-measurement information is thus a witness of the incompatibility of a given collection of measurements. We prove that all linear incompatibility witnesses can be implemented as some state discrimination protocol according to this scheme.