Philip Bayly | Washington University in St. Louis (original) (raw)

Philip Bayly

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Papers by Philip Bayly

ASME 2007 Summer Bioengineering Conference, 2007

ASME 2009 Summer Bioengineering Conference, Parts A and B, 2009

ASME 2011 Summer Bioengineering Conference, Parts A and B, 2011

ABSTRACT The forces exerted on the flagellum of the swimming alga Chlamydomonas reinhardtii by su... more ABSTRACT The forces exerted on the flagellum of the swimming alga Chlamydomonas reinhardtii by surrounding fluid are estimated from video data. “Wild-type” cells, as well as cells lacking inner dynein arms (ida3) and cells lacking outer dynein arms (oda2) were imaged (350 fps; 125 nm). Digital image registration and sorting algorithms provide high-resolution descriptions of the kinematics of the cell body and flagellum. The swimming cell is then modeled as an ellipsoid in Stokes flow, propelled by viscous forces that depend linearly on the velocity of the flagellum. The coefficients (CN and CT) that related normal and tangent forces on the flagellum to corresponding velocity components are estimated from equilibrium requirements. Their values are consistent among all three genotypes and similar to theoretical predictions.

Conference Proceedings of the Society for Experimental Mechanics Series, 2012

SAE Technical Paper Series, 2001

Quantitative Cardiac Electrophysiology, 2002

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 1994

Unstable periodic orbits in certain chaotic systems may be stabilized via small perturbations of ... more Unstable periodic orbits in certain chaotic systems may be stabilized via small perturbations of a control parameter. Stabilization using linear feedback has been achieved in both simulations and physical experiments. Not all chaotic systems can be controlled easily or well, and the effectiveness of proposed control algorithms depends strongly on mathematical properties of the chaotic behavior. Practical considerations are discussed that affect the robustness of local linear control strategies, with emphasis on the range of feedback gains which can stabilize the linearized map.

This paper presents a stability analysis of ventricular tachycardia (VT). Cardiac electrical acti... more This paper presents a stability analysis of ventricular tachycardia (VT). Cardiac electrical activity in 5 sheep with induced myocardial infarction was monitored with endocardial electrodes and on the body surface during and following induction into tachycardia. Consecutive cycle times were used to create a discrete state variable vector. Data were then classified into one of four categories: induction, steady-state tachycardia,