Spiral Waves in Oscillatory Media with Nonlocal Coupling

Gabriela Jaramillo from the University of Houston demonstrates, for a general oscillatory model with nonlocal coupling, the existence of spiral waves by first deriving an amplitude equation, then using the methods of multiple scales to identify terms in the spiral wave solutions to multiple orders, and finally numerically showing how nonlocal interactions shape the spirals.

Wanted: Minitutorial Proposals for DS23

SIAM is looking for minitutorial proposals from the DS community.

A Dynamical Systems View of the Outcomes of Viral Infections

Dynamical model of viral infections by Dixit demonstrates transitions between persistence and clearance as a bifurcation.

Machine Learning for Multiscale Systems: From Turbulence to Climate Prediction

Balwada and Zanna discuss the importance of balancing physical theory with data assimilation and machine learning in climate modeling.

The London Millennium Footbridge Revisited: Emergent Instability Without Synchronization

Beleykh and colleagues give evidence that Millennium Bridge instability may not have arise via synchronization using dynamical models and data.

2022: The Editorial Transition

Korana Burke, Robby Marangell, Jan Sieber, and Zachary Kilpatrick report on the changes in the editorial team of the DSWeb.

Elliptical Eyes, Eccentricity, and the Speed of Light

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

Weakly Coupled Dynamic Programs, Fluid Limits, and COVID-19: How Optimization Can Help Inform Policymaking

Huikang Liu and Wolfram Wiesemann summarize recent work developing a model-based national patient prioritization scheme in response to the limited capacity in the UK due to the continued COVID-19 pandemic. Their approach leverages dynamic programming to simultaneously estimate capacity and account for the dynamics of patient states and available resources.

The Many Behaviours of a Fourth Order Thin-film Equation

Michael C. Dallaston from the Queensland University of Technology discusses the variety of solution behaviors found in a fourth-order thin film equation that serves as a somewhat prototypical equation for a collection of nonlinear phenomena.