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


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Prossimi Eventi

  • nov 20 mar 2018

    MOX Seminar
    Tommaso Benacchio, Mixed finite elements for next-generation atmospheric models,  20-11-2018, ore 10:30
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    MOX

    • MOX Seminar
    • Tommaso Benacchio
    • MOX, Politecnico di Milano
    • Mixed finite elements for next-generation atmospheric models
    • Martedì 20 novembre 2018 alle ore 10:30
    • aula Saleri VI piano
    • Abstract
      The terrestrial atmosphere provides the arena for physical processes on multiple spatial and temporal scales. Numerical methods used to solve the governing hyperbolic models must simulate features of meteorological interest accurately while handling efficiently fast and less significant wavelike phenomena. Tight production constraints in operational numerical weather prediction (NWP) drive the development of scalable dynamical cores to keep up with computing architectures that increasingly rely on massively parallel systems for performance.
      While spectral transform and grid-point models have traditionally held sway in operational NWP and climate prediction, finite element methods have been gaining ground in recent years, due to their straightforward accuracy-tuning capabilities and flexibility towards unstructured grid arrangements in a context of deteriorating parallel performance of legacy codes. The seminar will present a mixed finite element-based dynamical core for the solution of the nonhydrostatic compressible equations under gravity. The mimetic spatial discretization reproduces continuous vector identities at the discrete level and ensures desirable properties such as pointwise mass conservation. Placement of the thermodynamic variable in a horizontally discontinuous, vertically continuous function space was recently shown to remove spurious buoyancy modes. Time discretization is handled by an iterative semi-implicit method. The numerical scheme is coded in object-oriented Fortran within a novel co-des!
      igned software framework using PSyClone, a Python-based domain-specific compiler. The new paradigm enables a clear separation of the scientific routines from the computational infrastructure, greatly facilitating portability across platforms and performance optimization.
      Results on two- and three-dimensional benchmarks of nonhydrostatic dynamics with idealized orography closely match those of existing models. Scaling scores will also be presented that highlight the model’s computational performance.
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

  • nov 20 mar 2018

    MOX Seminar
    Angelique Perrillat, What about nutrient kinetics in a (gliomatous) brain,  20-11-2018, ore 14:00
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    MOX

    • MOX Seminar
    • Angelique Perrillat
    • Université de Poitiers
    • What about nutrient kinetics in a (gliomatous) brain
    • Martedì 20 novembre 2018 alle ore 14:00
    • aula Saleri VI piano
    • Abstract
      The brain is an organ with high energy needs. While it represents only 2% of the body
      weight it grabs at least 20% of its total energy needs. The consumed energy can come from many
      forms such as glutamate, glucose, oxygen and also lactate. Moreover energy is necessary to support
      neural activity. But because energy management in healthy and tumoral cells can be difficult to
      observe and explain experimentally, we use mathematical modeling to help to describe and
      understand cells energy changes. We present here a time-delayed system and two fast-slow systems
      describing the local mechanisms of interest. We will also compare simulations with MRS and
      litterature data and discuss our results.
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

  • nov 21 mer 2018

    MOX Seminar
    Eva Fiserova, Working with compositional data in coordinates,  21-11-2018, ore 14:30
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    MOX

    • MOX Seminar
    • Eva Fiserova
    • Palacky University Olomouc, Czech Republic
    • Working with compositional data in coordinates
    • Mercoledì 21 novembre 2018 alle ore 14:30
    • aula Saleri VI piano
    • Abstract
      Compositional data are multivariate observations carrying only relative information, popularly expressed in percentages, proportions, mg/kg, etc. Because of features inherent to compositional data, such as scale invariance and the relative scale, the statistical analysis of raw compositional data often leads to spurious results. Natural principles of compositional data are followed by the Aitchison geometry on a simplex, the sample space of compositional data (Aitchison, 1986; Pawlowsky-Glahn et al., 2015). However, because most standard statistical methods rely on the Euclidean geometry in real space, compositional data need to be converted to this space prior to statistical processing. In the lecture, we will present the log ratio methodology for dealing with compositional data and several types of their coordinate representations, such as orthonormal log-ratio coordinates, pivot coordinates, weighted pivot coordinates (Hron et al., 2017), or symmetric balances (!
      Kynvclova et al., 2017). Their usage will be demonstrated on examples.
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

  • nov 22 gio 2018

    MOX Seminar Series
    Michele Benzi, An overview of some mathematical and computational problems in network science,  22-11-2018, ore 14:00
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    MOX
    MOX Numeth

    • MOX Seminar Series
    • Michele Benzi
    • Scuola Normale Superiore, Pisa
    • An overview of some mathematical and computational problems in network science
    • Giovedì 22 novembre 2018 alle ore 14:00
    • Aula Consiglio VII Piano – Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
    • Abstract
      Network Science is a rapidly growing interdisciplinary area at the intersection of mathematics, computer science, and a multitude of disciplines from the natural and life sciences to the social sciences and even the humanities. Network analysis methods are now widely used in proteomics, in the study of social networks (both human and animal), in finance, in ecology, in bibliometric studies, in archeology, and in a host of other fields. In this talk I will introduce the audience to some of the mathematical and computational problems and methods of complex networks, with an emphasis on the basic notions of centrality and communicability. More specifically, I will describe some of the problems in large-scale numerical linear algebra arising in this area, and how they differ from the corresponding problems encountered in more traditional applications of numerical analysis. The talk will be accessible to students, requiring only a modest background in linear algebra, numerical analysis and graph theory.

      Contacts: paola.antonietti@polimi.it, paolo.zunino@polimi.it
    • Michele Benzi
      Michele Benzi is full professor of Numerical Analysis at the Scuola Normale Superiore in Pisa. Until 2018 he was the Samuel Candler Dobbs Professor of Mathematics and Computer Science at Emory University, where he was on the faculty for 18 years, following positions at Los Alamos National Laboratory, CERFACS, and the University of Bologna. He received his PhD in 1993 from North Carolina State University and his Laurea degree from the University of Bologna in 1987. His main research interests are in numerical linear algebra, with a broad range of applications including CFD, Quantum Chemistry, and Network Science. He serves or has served on the editorial board of a number of scientific journals, and is a Fellow of both SIAM and the American Mathematical Society.
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

  • nov 26 lun 2018

    Seminar
    Shigefumi Mori, Birational equivalence of algebraic varieties,  26-11-2018, ore 16:30
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    • Seminar
    • Shigefumi Mori
    • Kyoto University Institute of Advanced Study
    • Birational equivalence of algebraic varieties
    • Lunedì 26 novembre 2018 alle ore 16:30
    • Aula Chisini, Diparimento di Matematica, Via C. Saldini 50
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

  • nov 27 mar 2018

    Seminar
    Luigi Vezzoni, The quantitative alexandrov theorem in space forms,  27-11-2018, ore 15:15
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    • Seminar
    • Luigi Vezzoni
    • Università degli Studi di Torino
    • The quantitative alexandrov theorem in space forms
    • Martedì 27 novembre 2018 alle ore 15:15
    • Aula seminari 3° piano
    • Abstract
      The talk focuses on a recent generalization of a classical result of Alexandrov. The celebrated Alexandrov’s Soap Bubble Theorem states that the spheres are the only closed (i.e. compact and without boundary) constant mean curvature hypersurfaces embedded in the Euclidean space. The theorem has been generalized to the hyperbolic space and to the hemisphere and to a large class of curvature operators. The main result of the talk is a quantitative version of Alexandrov’s theorem which I’ve obtained in collaboration with Giulio Ciraolo and Alberto Roncoroni by using a quantitative study of the method of the moving planes. The theorem implies a new pinching Theorem for hypersurfaces in space forms.
    • Politecnico di Milano, Dipartimento di Matematica via Bonardi 9, 20133 Milano – Telefono: +39 02 2399 4505 – Fax: +39 02 2399 4568

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