Upcoming Events

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Monday, 18.09.2017, 14.00 Uhr (WIAS-ESH)
Seminar Quantitative Biomedizin
Prof. D. Chapelle, Inria Saclay -- Ile de France , Frankreich:
Biomechanical modeling of the heart, and cardiovascular system --- From sarcomeres to organ/system, with experimental assessments and patient-specific clinical validations
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
Cardiac contraction originates at a subcellular - molecular, indeed - scale, within specific components of the cardiomyocytes (i.e. cardiac cells) called sarcomeres. This contractile behaviour then needs to be integrated at the organ level, namely, with a specific structure and shape. Furthermore, this organ crucially interacts with other physiological systems, the first of which being blood circulation via the cardiac function itself, and also the nervous system that controls the heart via various regulation mechanisms, and these interactions must be adequately represented in order to obtain accurate and predictive model simulations. This presentation will provide an overview of the recent advances on cardiac modeling achieved in the M3DISIM group, with a particular focus on the key multiscale, multi-physics and integrated system modeling aspects that need to be addressed, with many associated challenges pertaining to numerical methods, model validation, and inverse problems, in particular.

Host
WIAS Berlin
Tuesday, 19.09.2017, 10.15 Uhr (WIAS-ESH)
Seminar Nichtlineare Optimierung und Inverse Probleme
S. Wolf, Technische Universität Berlin:
Tensor reconstruction
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Host
WIAS Berlin
Tuesday, 19.09.2017, 15.00 Uhr (WIAS-ESH)
Seminar Numerische Mathematik
M. Patriarca, University of Rome ``Tor Vergata'', Italy:
Discontinuous finite element discretization for semiclassical particle transport
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
In order to understand how semiconductor devices operate, it is very common to solve a Poisson equation coupled with drift-diffusion equations for electrons and holes. We present several discontinuous approaches to solving the Poisson equation: non-symmetric interior penalty, lifting operator and a mixed approach among finite volume method and discontinuous Galërkin finite element method. We discuss the advantages and drawbacks of these approaches in order to extend the best discretization method to the drift-diffusion model. The stationary case is implemented in our software simulator TiberCAD. Simulation results are shown to highlight the problems encountered.

Host
WIAS Berlin
Thursday, 21.09.2017, 14.00 Uhr (WIAS-ESH)
Seminar Numerische Mathematik
Dr. Ch. Freysoldt, Max-Planck-Institut für Eisenforschung, Düsseldorf:
Concept and algorithms in SPHInX
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
SPHInX is a C++ class library for computer simulations in material science, with a focus on electronic-structure theory. Our aim is to provide a framework that is on one hand enables physicists to implement easily new algorithms, and on the other hand makes use of developments in computer hardware and software design principles to achieve efficiency.
I will give an overview over the hierarchy of available classes, and exemplify how mathematical and physical concepts are mapped onto C++ classes. I will then demonstrate the mutual benefit of concept and algorithm evolution. Last, some seemingly minor features of the SPHInX package will be highlighted, such as debugging checks, clocks, file parsing, or command line options, that proved to be immensely productive in daily work.

Host
WIAS Berlin