Upcoming Events
- Tuesday, 05.11.2024, 10:00 (WIAS-406)
- FEniCS Meeting
Andrea Zafferi: Eulerian nonlinear poroelasticity and diffusion using gradient flows
Cristian Carcamo Sanchez: A brief review of Multiphenics applied to a Navier-Stokes-Darcy Coupling
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Host
WIAS Berlin
- Wednesday, 06.11.2024, 11:30 (WIAS-405-406)
- Seminar Interacting Random Systems
Jonas Köppl, WIAS Berlin:
Spontaneous time-symmetry breaking in interacting particle systems
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Abstract
We study the behaviour of interacting particle systems on the integer lattice $mathbbZ^d$ with a focus on symmetries of their stationary measures. In particular, we are interested in spontaneous symmetry breaking, i.e., situations where there are stationary measures that satisfy less symmetries than the transition rates themselves. Classical examples include the Glauber dynamics for the Ising model, where the global spin-flip symmetry is broken in dimensions $dgeq 2$ and the translation-symmetry is broken in dimension $dgeq3$. In this talk, we discuss the possibility of a spontaneous breaking of the time-symmetry, i.e., whether an interacting particle system with time-homogeneous rates can admit time-periodic behaviour. While this can easily be ruled out in finite volume, the situation is much more delicate in the thermodynamic limit. We provide a no-go theorem under the additional assumption of reversibility and exhibit examples of non-degenerate interacting particle systems which do indeed exhibit spontaneous time-symmetry breaking.
Host
WIAS Berlin
- Thursday, 07.11.2024, 10:00 (WIAS-405-406)
- Software and Data Seminar
Dr. Jan Philipp Thiele, WIAS:
Intermediate Unix Shell (command line interface)
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Abstract
As a deeper dive into the command line (Terminal/Konsole) we will answer the following questions: - How can I perform the same actions on many different files? - How can I save and reuse commands? - How can I find files? - How can I find things in files?
Further Informations
Prerequisites: You should bring your own laptop with a Bash shell installed. You can follow the instructions for your operating system for `The Bash Shell` (https://carpentries.github.io/workshop-template/install_instructions/#shell) to install both git and a bash terminal (if not already present).
Host
WIAS Berlin
- Thursday, 07.11.2024, 15:00 (WIAS-405-406)
- Seminar Materialmodellierung
Dr. Tomáš Bodnár, Czech Technical University in Prague, Tschechische Republik:
On the use of viscoelastic fluids flows models in hemolysis prediction
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Abstract
The mathematical modeling and numerical simulations of blood flows is a very challenging problem due to complex rheological properties of blood. The blood can be considered as a suspension of red blood cells in blood plasma, resulting in a shear-thinning and viscoelastic behavior of the whole blood. It is well known that high levels of stress in blood flows, typically found in ventricular assist devices for example, can lead to blood damage - the hemolysis. Under high stress the red blood cells can be damaged or ruptured, which can lead to serious medical consequences. This is why a considerable effort has been dedicated by numerous researchers to prediction of the blood damage, based on the detailed knowledge of the flow field. There exists a number of models for hemolysis, but non of them is generally accepted as a definitive, convenient and reliable tool for prediction of hemolysis. The aim of the presented talk is to point out the importance of inclusion of non-Newtonian rheology of blood in the hemolysis predictions. The similarity between some of the promising stretch based tensorial models of hemolysis and the non-linear viscoelastic rheology models offers the possibility to estimate the hemolysis directly from the local stretch tensor. This possibility will be presented and discussed in detail.
Further Informations
Seminar Materialmodellierung
Host
WIAS Berlin
- November 13, 2024 (Erwin-Schroedinger-Zentrum)
- Workshop/Konferenz: Foundations of Modern Nonparametric Statistics
more ... Location
Erwin-Schrödinger Zentrum Adlershof , Rudower Chaussee 26, 12489 Berlin.
Host
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Wednesday, 13.11.2024, 15:15 (WIAS-405-406)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Lukas Abel, Humboldt-Universität zu Berlin:
A scaling law for a model of epitaxial growth with dislocations
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Abstract
Epitaxy is a special form of crystal growth and of great importance in modern technology. We consider a crystalline film on a (rigid) substrate. The misfit between the crystal structures of the film and the substrate can lead to dislocations and can have an influence on the morphology of the film. Dislocations are topological defects of the crystallographic lattice. In this talk we will study a variational model from the literature. It is based on linearized elasticity and additionally takes into account the surface energy of the film's free surface as well as the dislocation nucleation energy. In particular we will discuss a new scaling law for the infimum of the energy. This includes a new construction for the upper bound and a new variant of a ball-construction combined with thorough local estimates for the lower bound. The results indicate that in certain parameter regimes, the formation of dislocations is expected. Reference: Preprint arXiv no. 2403.13646, https://arxiv.org/abs/2403.13646
Further Informations
Oberseminar “Nichtlineare Partielle Differentialgleichungen” (Langenbach Seminar)
Host
Humboldt-Universität zu Berlin
WIAS Berlin
- Thursday, 14.11.2024, 10:00 (WIAS-Library)
- Joint Research Seminar on Nonsmooth Variational Problems and Operator Equations / Mathematical Optimization
Dr. Amal Alphonse, WIAS Berlin:
Free boundary problems as limits of a bulk-surface model for receptor-ligand interactions on evolving domains
more ... Location
Weierstraß-Institut, Hausvogteiplatz 5-7, 10117 Berlin, R411
Abstract
We derive various free boundary problems as reaction or singular limits of a coupled bulk-surface reaction-diffusion system on an evolving domain. These limiting free boundary problems may be formulated as Stefan-type problems on an evolving hypersurface. These results, which are new even in the setting where there is no domain evolution, are of particular relevance to an application in cell biology. In this talk, I will discuss the modelling, sketch the analysis, show some numerical simulations and finish with some open questions. Based on a joint work with Charlie Elliott, Chandrasekhar Venkataraman and Diogo Caetano.
Further Informations
Joint Research Seminar on Nonsmooth Variational Problems and Operator Equations
Host
WIAS Berlin
- Tuesday, 19.11.2024, 13:30 (WIAS-406)
- Seminar Materialmodellierung
Angeliki Koutsimpela, Universität Augsburg:
Mean-field limits for interacting particle systems
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Host
WIAS Berlin
- Wednesday, 20.11.2024, 11:30 (WIAS-405-406)
- Seminar Interacting Random Systems
Júlia Komjáthy, TU Delft:
tba
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Host
WIAS Berlin
- Thursday, 28.11.2024, 14:00 (WIAS-HVP-3.13)
- Seminar Numerische Mathematik
Dr. Lucas Omar Muller, University of Trento, Italien:
Towards real-life computional haemodynamics
more ... Location
Weierstraß-Institut, Hausvogteiplatz 11A, 10117 Berlin, 3. Etage, Raum: 3.13
Abstract
Understanding the fundamental forces driving human physiology relies on a deep understanding of the circulation. During our daily life, the cardiovascular system is exposed to a wide range of biomechanical environments. This complexity requires a systemic approach to integrate phenomena across various temporal and spatial scales. Most of the research efforts in this do- main have focused on simplified cardiovascular scenarios such as the resting state, the supine position, and occasionally disease conditions. However, the cardiovascular system experiences large deviations from such prototypical conditions, which are, in many cases, highly beneficial to sustaining a healthy life. The impact of fundamental factors such as respiration, control mech- anisms, gravity, diverse physiological states (e.g., exercise or sleep conditions), and the integration of organ-specific physiology and disease into blood flow models has only been partially addressed. This talk aims to explore ongoing work in the field of computational hemodynamics at the systemic scale exploiting an anatomically detailed arterio-venous network 1D model [1] and highlighting modelling and numerical challenges related to simulations that intend to incorporate three aspects that are inextri- cably coupled to the circulation in our routine life: (i) the effect of respiration, (ii) the effect of orthostatic stress, and (iii) the presence of massive microvascular networks.
Further Informations
Numerics Seminar
Host
WIAS Berlin
- Wednesday, 04.12.2024, 11:30 (WIAS-405-406)
- Seminar Interacting Random Systems
Günter Last, Karlsruher Institut für Technologie:
tba
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Host
WIAS Berlin
- Wednesday, 11.12.2024, 11:30 (WIAS-405-406)
- Seminar Interacting Random Systems
Leoni Carla Wirth, Universität Göttingen:
tba
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Host
WIAS Berlin
- Wednesday, 15.01.2025, 10:00 (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Xiaorui Zuo, National University of Singapore , Singapur:
Cryptos have rough volatility and correlated jumps
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Further Informations
Dieser Vortrag findet hybrid statt. Die Teilnahme per Zoom ist über den (neuen!) Link: https://hu-berlin.zoom-x.de/j/62476510180?pwd=1bws9DORlDM2Iub3ANrb7zzDNANvsJ.1
Host
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin