Edward Fraenkel

Professor Ludwig Edward Fraenkel (1927-2019).

Edward Fraenkel (1927-2019)

Professor Ludwig Edward Fraenkel died on 27 April 2019.

Elliptical Eyes, Eccentricity, and the Speed of Light

Mark Levi discusses the relationship between the eccentricity and focusing geometry of an elliptical lens.

Engineered for Function: The Power of Biologically-Constrained Neural Networks for Neurosensory Integration

Charles B. Delahunt, Charles Fieseler, and J. Nathan Kutz report on two bio-inspired models for neurosensory integration that are constructed using data-driven modeling methods. One model is for olfactory processing of the Manduca sexta moth. The other model captures functioning of Caenorhabditis elegans. These organisms use different network architectures for functionality: Manduca sexta moth uses a large, randomly-connected network for sensory information  processing and learning; Caenorhabditis elegans, on the other hand, functions on a small, stereotyped connectivity graph.  

Evaluating the Effectiveness of Mitigation Policies Against Disinformation

Butts and Murillo determine efficacy of disinformation mitigation policies in dynamic models.

Executive Director Jim Crowley Retires After 25 Years of SIAM Leadership

Lina Sorg, the managing editor of SIAM News, reflects on Jim Crowley's twenty-five year tenure as SIAM Executive Director, and shares memories and well-wishes of SIAM Members who have worked with him over the years.

Exploring Symmetry in Chaos

Michael Field and Martin Golubitsky announce the second edition of their book Symmetry in Chaos: A Search for Pattern in Mathematics, Art, and Nature.

Flight at Low Reynolds Numbers: The Aerodynamics of Tiny Insects

Aghav and Miller discuss their research investigating aerodynamics of wing bristles in small insects.

Four Decades of Kink Interactions in Nonlinear Klein-Gordon Models: A Crucial Typo, Recent Developments and the Challenges Ahead

P. G. Kevrekidis (kevrekid (at) math.umass.edu) and R. H. Goodman summarize the history and recent developments in the field of kink interactions in nonlinear Klein-Gordon models in 1+1-dimensions.

Front Propagation in a Model for Civil Unrest

Ghazaryan and Rodríguez describe recent work revealing front propagation in a model of civil unrest.

Frontiers of Invariant Manifold Approximation in Multiple-Timescale Dynamics

Ian Lizarraga from the School of Mathematics and Statistics, The University of Sydney, (ian.lizarraga (at) sydney.edu.au) describes how to use the computational singular perturbation (CSP) method and the parametrization method to compute approximations to invariant manifolds. He also shows how the parametrization method can be adapted to problems with more than two time scales.

Generalised Symmetry in Network Dynamics

Eddie Nijholt, Bob Rink, and Sören Schwenker talk about synchrony breaking bifurcations in dynamical systems on networks and how to understand them through generalised symmetry.

Geneviève Raugel (1951 - 2019)

An Announcement of the Death of Genevieve Raugel.

How Do Snakes Slither? A Recipe for Reptation

Mark Levi develops a "dynamical recipe for reptation" by analyzing the physics of slithering snakes.

How to Move a SIAM Minisymposium Online from the Comfort of your Home

Heather Z. Brooks, Yuxin Chen, Michelle Feng, Yacoub H. Kureh, Mason A. Porter, and Alexandria Volkening talk about how they moved their MDS20 minisymposium on line.