Tushar Das
Mathematics & Statistics
Tushar Das, Mathematics & Statistics, presented "Surviving Under Pressure: Spectral Perturbation from Continued Fractions to Open Dynamical Systems" at the American Mathematical Society Special Session on Ergodic Geometry, Fall Eastern Meeting 2026 on Saturday, Oct. 3 at George Washington University, Washington, D.C.
An open dynamical system is obtained by cutting a “hole” in the phase space of a dynamical system and studying those points whose forward trajectories never enter the hole. A simple, but already highly nontrivial, example is provided by the Gauss continued-fraction map, where one may investigate the set of surviving points whose orbits never enter a prescribed interval. When the hole moves, the associated spectral and geometric quantities vary with it: the leading eigenvalue and surviving eigenfunction of the open transfer operator, its spectral projector, escape rates, fractal dimensions of the survivor set, etc. Determining the exact asymptotic response of this rich spectral and geometric package under moving-hole perturbations raises a number of challenges, since the perturbation is inherently singular and generally lies outside the scope of ordinary smooth perturbation theory. Our perturbative technology that produces higher-order dimension expansions for bounded-digit continued-fraction Cantor sets can be carried over to Cantor limit sets associated with degenerating Hecke orbifolds of infinite covolume. The lecture describes results and open problems in this rich vein, some of which is joint work with Simmons and with Tiozzo--Urbanski--Zdunik; the latter supported in part by the IAS in Princeton, NJ.
Thomas Kernozek, Vivek Tara and C. N. Vannatta
Health Professions, Computer Engineering and Physics and Physical Therapy
Thomas Kernozek, Health Professions; Vivek Tara, Computer Engineering and Physics; and C. N. Vannatta, Physical Therapy; co-authored the article "Exploring running classifications using foot inclination angle and ground reaction force clustering methods: Do traditional foot strike categories capture meaningful patterns in ground reactions forces?" in Gait and Posture and was accepted for publication by Elsevier. Nate Vannatta is a long-time La Crosse Institute for Movement Science (LIMS) collaborator with Gundersen Sports Medicine. Vivek Tara was an undergraduate research collaborator and UWL graduate of computer engineering and physics.
Barrett Klein
Biology
Barrett Klein, Biology, presented "The Insect Epiphany: How Our Six-Legged Allies Shape Human Culture" at Land Ethic Live! for the Aldo Leopold Institute on Oct. 8 online. The topic of the presentation was insects and their importance as providers of ecosystem services, cultural services, as well as their inherent value as diverse, beautiful fellow inhabitants of Earth.
Heather Walder
Archaeology & Anthropology
Heather Walder, Archaeology & Anthropology, presented "Probably Not Perrot: Glass Beads, Indigenous Occupations, and Exchange Networks near Trempealeau, WI in the 18th – 19th Centuries" at the Midwest Archaeological Conference on Oct. 10 in Mankato, MN. Based on new archaeological analyses of soil chemistry and legacy collections from near Trempealeau, WI, the paper challenges the late 17th century attribution of the site to explorer Nicholas Perrot and proposes a renaming of "Perrot State Park" to highlight the enduring Indigenous landscape and presence there.
Remembering
Alumnus Daniel J. Krautkramer, '82, died Sept. 28. For more information see the obituary.
Alumnus Loren James Kannenberg, '72, died Sept. 30. For more information see the obituary.
Alumnus Gary Anve Espeland, '66, died Oct. 1. For more information see the obituary.
Alumna Meredith Anne (Zink) Ghattas, '72, died Oct. 6. For more information see the obituary.
Alumnus Roger J. Valley, '76, died Oct. 7. For more information see the obituary.
Alumna Judith L Molzahn, '67, died Oct. 8. For more information see the obituary.
Thanks to the Race, Gender & Sexuality Studies Department (RGSS) and Shuma Iwai, RGSS, for a strong partnership in hosting the Midwest Conference on Asian Affairs in early October. For this conference, UWL welcomed participants from around the world whose scholarship spans the globe. You might even say it was a great opportunity to help "deepen UWL's role as a regional partner and cultural hub by fostering impactful community engagement that reaches from local to global communities."
— Graduate & Extended Learning
Toro 5 HP Snowblower — Toro 5 HP Snowblower, CCR-3000 GTS with Suzuki engine which runs well. Needs scraper bar. $35. $35. For more information, contact Tom Aiuppa at 608.780.5422 or TomAiuppa@eagle.uwlax.edu.