Markus Bär
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View article: Improved flow prediction of non-ideal sonic nozzles by CFD-based surrogate modelling
Improved flow prediction of non-ideal sonic nozzles by CFD-based surrogate modelling Open
The use of sonic nozzles as a high-precision standard for gas flow measurements in various engineering and metrological applications is well-established. Due to tolerances during manufacturing, the local curvature radius near the nozzle th…
View article: A computational study on the influence of antegrade accessory pathway location on the 12-lead electrocardiogram in Wolff-Parkinson-White syndrome
A computational study on the influence of antegrade accessory pathway location on the 12-lead electrocardiogram in Wolff-Parkinson-White syndrome Open
Wolff-Parkinson-White syndrome is a cardiovascular disease characterized by abnormal atrio-ventricular conduction facilitated by accessory pathways (APs). Invasive catheter ablation of the AP represents the primary treatment modality. Accu…
View article: Synchronization and metachronal waves of elastic cilia caused by transient viscous flow
Synchronization and metachronal waves of elastic cilia caused by transient viscous flow Open
Hydrodynamic coordination of cilia is ubiquitous in biology. It is commonly modeled using the steady Stokes equations. The flow around ciliated cells, however, exhibits finite time vorticity diffusion, requiring a dynamical description. We…
View article: Pattern selection and the route to turbulence in incompressible polar active fluids
Pattern selection and the route to turbulence in incompressible polar active fluids Open
Active fluids, such as suspensions of microswimmers, are well known to self-organize into complex spatio-temporal flow patterns. An intriguing example is mesoscale turbulence, a state of dynamic vortex structures exhibiting a characteristi…
View article: Pattern selection and the route to turbulence in incompressible polar active fluids
Pattern selection and the route to turbulence in incompressible polar active fluids Open
Active fluids, such as suspensions of microswimmers, are known to self-organize into complex spatio-temporal flow patterns. An intriguing example is mesoscale turbulence, a state of dynamic vortex structures exhibiting a characteristic len…
View article: MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations
MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess precisely known ground …
View article: MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations
MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess precisely known ground …
View article: MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations
MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess precisely known ground …
View article: Derivation and validation of a reference data-based real gas model for hydrogen
Derivation and validation of a reference data-based real gas model for hydrogen Open
Hydrogen plays an important role for the decarbonization of the energy sector. In its gaseous form, it is stored at pressures of up to 1000 bar at which real gas effects become relevant. To capture these effects in numerical simulations, a…
View article: Mechanism of defibrillation of cardiac tissue by periodic low-energy pacing
Mechanism of defibrillation of cardiac tissue by periodic low-energy pacing Open
Rotating excitation waves and electrical turbulence in excitable cardiac tissue are associated with arrhythmias such as life-threatening ventricular fibrillation. Experimental studies (S. Luther et al., Nature 475, 235-239 (2011)). have sh…
View article: MedalCare-XL: 16,900 healthy and pathological 12 lead ECGs obtained through electrophysiological simulations
MedalCare-XL: 16,900 healthy and pathological 12 lead ECGs obtained through electrophysiological simulations Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess known ground truth labe…
View article: MedalCare-XL
MedalCare-XL Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess precisely known ground …
View article: MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations
MedalCare-XL: 16,900 healthy and pathological synthetic 12 lead ECGs obtained through electrophysiological simulations Open
Mechanistic cardiac electrophysiology models allow for personalized simulations of the electrical activity in the heart and the ensuing electrocardiogram (ECG) on the body surface. As such, synthetic signals possess precisely known ground …
View article: Suppression of fibrillatory dynamics consisting of stable rotors by periodic pacing
Suppression of fibrillatory dynamics consisting of stable rotors by periodic pacing Open
Recent experimental studies have shown that a sequence of low-energy electrical far-field pulses is able to terminate fibrillation with substantially lower per-pulse energy than a single high-energy electric shock (see S Luther et al Natur…
View article: Biophysical aspects underlying the swarm to biofilm transition
Biophysical aspects underlying the swarm to biofilm transition Open
Bacteria organize in a variety of collective states, from swarming—rapid surface exploration, to biofilms—highly dense immobile communities attributed to stress resistance. It has been suggested that biofilm and swarming are oppositely con…
View article: Ising-like Critical Behavior of Vortex Lattices in an Active Fluid
Ising-like Critical Behavior of Vortex Lattices in an Active Fluid Open
Turbulent vortex structures emerging in bacterial active fluids can be organized into regular vortex lattices by weak geometrical constraints such as obstacles. Here we show, using a continuum-theoretical approach, that the formation and d…
View article: Biophysics underlying the swarm to biofilm transition
Biophysics underlying the swarm to biofilm transition Open
Bacteria organize in a variety of collective states, from swarming, which has been attributed to rapid surface exploration, to biofilms, which are highly dense immobile communities attributed to stress resistance. It has been suggested tha…
View article: Suppression of fibrillation consisting of stable rotors by periodic pacing
Suppression of fibrillation consisting of stable rotors by periodic pacing Open
Recent experimental studies have shown that a sequence of low-energy electrical far-field pulses is able to terminate fibrillation with substantially lower per-pulse energy than a single high-energy electric shock (see S. Luther et al. Nat…
View article: Heterogeneous bacterial swarms with mixed lengths
Heterogeneous bacterial swarms with mixed lengths Open
Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on its constituents. These considerations are particularly si…
View article: Turbulence-induced clustering in compressible active fluids
Turbulence-induced clustering in compressible active fluids Open
A continuum model of compressible active polar fluids, incorporating typical characteristics of bacterial swarms, is analyzed. We identify a novel phase in which self-sustained turbulence continuously creates and destroys dense clusters.
View article: Organizing bacterial vortex lattices by periodic obstacle arrays
Organizing bacterial vortex lattices by periodic obstacle arrays Open
Recent experiments have shown that the complex spatio-temporal vortex structures emerging in active fluids are susceptible to weak geometrical constraints. This observation poses the fundamental question of how boundary effects stabilize a…
View article: A phase diagram for bacterial swarming
A phase diagram for bacterial swarming Open
Bacterial swarming is a rapid mass-migration, in which thousands of cells spread collectively to colonize surfaces. Physically, swarming is a natural example for active particles that use energy to generate motion. Accordingly, understandi…
View article: Self-Propelled Rods: Insights and Perspectives for Active Matter
Self-Propelled Rods: Insights and Perspectives for Active Matter Open
A wide range of experimental systems including gliding, swarming and swimming bacteria, in vitro motility assays, and shaken granular media are commonly described as self-propelled rods. Large ensembles of those entities display a large va…
View article: Active poroelastic two-phase model for the motion of physarum microplasmodia
Active poroelastic two-phase model for the motion of physarum microplasmodia Open
The onset of self-organized motion is studied in a poroelastic two-phase model with free boundaries for Physarum microplasmodia (MP). In the model, an active gel phase is assumed to be interpenetrated by a passive fluid phase on small leng…
View article: Active Poroelastic Two-Phase Model for the Motion of Physarum Microplasmodia
Active Poroelastic Two-Phase Model for the Motion of Physarum Microplasmodia Open
The onset of self-organized motion is studied in a poroelastic two-phase model with free boundaries for Physarum microplasmodia (MP). In the model, an active gel phase is assumed to be interpenetrated by a passive fluid phase on small leng…
View article: Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions
Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions Open
In this paper, we systematically derive a fourth-order continuum theory capable of reproducing mesoscale turbulence in a three-dimensional suspension of microswimmers. We start from overdamped Langevin equations for a generic microscopic m…
View article: Control of electrical turbulence by periodic excitation of cardiac tissue
Control of electrical turbulence by periodic excitation of cardiac tissue Open
Electrical turbulence in cardiac tissue is associated with arrhythmias such as life-threatening ventricular fibrillation. Recent experimental studies have shown that a sequence of low-energy electrical far-field pulses is able to terminate…
View article: Mechanochemical pattern formation in simple models of active viscoelastic fluids and solids
Mechanochemical pattern formation in simple models of active viscoelastic fluids and solids Open
The cytoskeleton of the organism Physarum polycephalum is a prominent example of a complex active viscoelastic material wherein stresses induce flows along the organism as a result of the action of molecular motors and their regulation by …
View article: Reentry and Ectopic Pacemakers Emerge in a Three-Dimensional Model for a Slab of Cardiac Tissue with Diffuse Microfibrosis near the Percolation Threshold
Reentry and Ectopic Pacemakers Emerge in a Three-Dimensional Model for a Slab of Cardiac Tissue with Diffuse Microfibrosis near the Percolation Threshold Open
Arrhythmias in cardiac tissue are generally associated with irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. Recently, it was shown in simulations of two…