2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020
Current contacts: Benjamin Seibold or Daniel B. Szyld
The Seminar usually takes place on Wednesdays at 4:00 PM in Room 617 on the sixth floor of Wachman Hall. Click on title for abstract.
Join meeting HERE.
Faycal Chaouqui, Temple University
Join meeting HERE.
We present a new optimal coarse space correction for the optimized Restricted
Additive Schwarz method. We use coarse spaces defined by harmonic extensions
of interface and surface functions to the subdomains’ interior. In particular, we
show that these coarse spaces yield convergence in a single iteration when fully
used. We then explain how to choose and implement approximations of these
coarse spaces utilizing the operator’s spectral information. Numerical examples
are provided to illustrate the performance of the ideas presented.
Abhijit Biswas, Temple University
Join meeting HERE.
Runge-Kutta methods experience order reduction when they are applied to certain stiff problems. There are non-DIRK schemes with high-stage order, which can remedy order reduction. However, DIRK schemes, which are of vital interest because they can achieve higher-order by sequentially solving backward-Euler-type stages, are restricted to low stage order. The concept of WSO weak stage order, which manifests in algebraic conditions on the Runge-Kutta Butcher tableau, can relax the stage order conditions in a way that it becomes compatible with the DIRK structure. Thus, DIRK schemes with high WSO can rectify order reduction. In this talk, I will present some of the recently developed DIRK schemes with high WSO along with some numerical results.
James Rosado, Temple University
Join meeting HERE.
The endoplasmic reticulum (ER) is a complex dynamic organelle which reaches into the cellular compartments of a neuron, including dendritic spines. For this talk we will explain the model equations that govern the ion exchange mechanisms located on the plasma membrane (PM) of the neuron and the exchange mechanisms located on ER membrane. We will also demonstrate for different spine-dendrite morphologies, modifying calcium influx rate at the synapse of the spine, and modifying the density of receptors on the ER membrane affects calcium propagation through the spine-dendrite.
Andreas Vogel, Ruhr-University Bochum, Germany
Join meeting HERE.
Multigrid methods allow for highly-scalable implementations on largest supercomputers by balancing the mesh hierarchy among the involved processes. In addition, geometric multigrid excellently interplays with adaptive mesh refinement to account for highly-localized features and to speed up the computation by saving non-required degrees of freedom. An overview about the implementation in the massively-parallel simulation framework UG4 is presented together with studies on frequency adaption for energy saving and fine-grained scalability investigations. The applicability on state-of-the-art high-performance computing clusters with quasi-optimal scalability is demonstrated on a variety of problems from computational biology, subsurface flow and engineering including PDE continuum model simulations and numerical optimization.Bo Li, Department of Mathematics and Quantitative Biology Ph.D. Program, University of California, San Diego
The growth of bacterial colony exhibits striking complex patterns and robust scaling laws. Understanding the principles that underlie such growth has far-reaching consequences in biological and health sciences. In this work, we develop a mechanical theory of cell-cell and cell-environmental interactions and construct a hybrid three-dimensional computational model for the growth of E. coli colony on a hard agar surface. Our model consists of microscopic descriptions of the growth, division, and movement of individual cells, and macroscopic diffusion equations for the nutrients. The cell movement is driven by the cellular mechanical interactions. Our large-scale simulations and analysis predict the linear growth of the colony in both the radial and vertical directions in a good agreement with the experimental observations. We find that the mechanical buckling and nutrient penetration are the key factors in determining the underlying growth scalings. This work is the first step toward detailed computational modeling of bacterial growth with mechanical and biochemical interactions. This is joint work with Mya Warren, Hui Sun, Yue Yan, Jonas Cremer, and Terence Hwa.
Rabie Ramadan, Temple University
Stephanie Lewkiewicz, Temple University
Wendy Ju, Cornell Tech
Carlos Perez Arancibia, Pontificia Universidad Catolica de Chile
Spiridoula Matsika, Department of Chemistry, Temple University
Matthias Gobbert, University of Maryland Baltimore County
2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020