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Events

• Feb

  4

  Appl Math: Pedro Saenz on "Walking Droplets & Galloping Bubbles"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: Walking Droplets & Galloping Bubbles

  Speaker: Pedro Saenz, University of North Carolina at Chapel Hill

  Abstract: This talk explores two distinct problems in physics and engineering, blending experiments, simulations, and theory. The first part examines walking droplets, or "walkers," which self-propel across a vibrating fluid bath through a resonant interaction with their guiding wave field. These droplets exhibit behaviors typically associated with quantum particles, such as localized motion in disordered environments, which is akin to quantum Anderson localization. The study reveals that diffusion is suppressed when the guiding wave field interacts with random topographies, driven by a resonant coupling that creates an attractive wave potential, demonstrating how a classical particle can localize like a wave. The second part introduces a new mechanism where bubbles "gallop" along horizontal surfaces in a vertically vibrated fluid chamber, powered by interactions between their shape oscillations. These active bubbles can follow diverse trajectory patterns, including rectilinear, orbital, and run-and-tumble motions, which can be controlled by external forces. Through periodic deformations and inertial forces, these bubbles achieve self-propulsion without external direction. The study presents potential applications for galloping bubbles, including bubble manipulation, transport, sorting, navigation through complex fluid networks, and surface cleaning.

  Zoom: https://northwestern.zoom.us/j/93833993196

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  TIME Tuesday, February 4, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

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  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)

• Jan

  6

  Winter classes begin

  University Academic Calendar

  All Day

  EVENT DETAILS

  Winter classes begin

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  TIME Monday, January 6, 2025

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  CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

  CALENDAR University Academic Calendar

• Jan

  14

  Appl Math: Luis Amaral on "Science Is an All-You-Can-Eat Buffet and I Am Not Dieting"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: Science Is an All-You-Can-Eat Buffet and I Am Not Dieting

  Speaker: Luis Amaral, Northwestern University

  Abstract: In the old days, mathematicians were alchemists, astronomers, astrologers, chemists, demographers, philosophers, surveyors, and so many other things. Even as recently as 1944, Schrödinger could write about “how can the events in space and time which take place within the spatial boundary of a living organism be accounted for by physics and chemistry?" In modern times, it seems that if you do not stick with your discipline's scope then you are at risk of being dismissed as an interloper or a hack. But beauty can be found in many different areas of knowledge and rigor can be used to address phenomena from areas lacking rigorous abstractions. I will indulge in describing some examples from my lab’s recent research.

  Zoom: https://northwestern.zoom.us/j/99845530059

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  TIME Tuesday, January 14, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

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  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)

• Jan

  21

  Appl Math: Jane Kondev on "Title TBA"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: TBA

  Speaker: Jane Kondev, Brandeis University

  Abstract: TBA

  Zoom: TBA

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  To subscribe to the Applied Mathematics Colloquia List send a message to LISTSERV@LISTSERV.IT.NORTHWESTERN.EDU with the command:

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  TIME Tuesday, January 21, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

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  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)

• Feb

  25

  Appl Math: Jim Stone on "Title TBA"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: TBA

  Speaker: Jim Stone, Institute for Advanced Study

  Abstract: TBA

  Zoom: TBA

  -----

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  TIME Tuesday, February 25, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

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  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)

• Mar

  11

  Appl Math: Vaseem Shaik on "Active Particles in Inhomogeneous Environments"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: Active Particles in Inhomogeneous Environments

  Speaker: Vaseem Shaik, Northwestern University

  Abstract: Active particles are entities, either living (like microorganisms, birds, and humans) or non-living (like nanorobots), that convert stored energy into directed motion. A suspension of these particles is called active matter. They often navigate through inhomogeneous environments such as gradients in heat, light, nutrients, or fluid properties like viscosity and density, exhibiting directed motion known as taxis (e.g., chemotaxis, phototaxis, gravitaxis). This summary focuses on μm - mm-sized particles swimming in fluids with mechanical property gradients, like viscosity, elasticity, and density. It discusses phenomena like viscotaxis (response to viscosity gradients), behavior similar to light refraction in viscosity gradients (described by a Snell’s law), durotaxis (response to elasticity gradients), and densitaxis (response to density gradients), with implications for plankton migration. The study also covers particle-induced mixing and the influence of noise, exploring how these inhomogeneities can control active matter in confined environments.

  Zoom: https://northwestern.zoom.us/j/96970714028

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  TIME Tuesday, March 11, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

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  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)

• Apr

  8

  Appl Math: Brennan Sprinkle on "Title TBA"

  McCormick-Engineering Sciences and Applied Mathematics (ESAM)

  11:15 AM M416, Technological Institute

  EVENT DETAILS

  Title: TBA

  Speaker: Brennan Sprinkle, Colorado School of Mines

  Abstract: TBA

  Zoom: TBA

  -----

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  more less

  TIME Tuesday, April 8, 2025 at 11:15 AM - 12:15 PM

  LOCATION M416, Technological Institute    map it

  ADD TO CALENDAR

  CONTACT Ted Shaeffer    ted.shaeffer@northwestern.edu EMAIL

  CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)