News & EventsDepartment Events
Events
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Mar4
EVENT DETAILS
Title: A Wave Theory of Waves
Speaker: Mark Hoefer, University of Colorado Boulder
Abstract: Hydrodynamic theories describe long wave propagation in a continuum, such as a fluid where the microscopic constituents are interacting fluid particles. When the constituents are interacting waves rather than particles, we arrive at a macroscopic wave theory of waves called dispersive hydrodynamics. A canonical example is the dispersive shock wave or DSW, which consists of an unsteady (expanding) collection of nonlinear oscillations terminating with zero amplitude (harmonic limit) at one end and zero wavenumber (soliton limit) at the other. Scale separation leads to the mathematical framework of nonlinear wave modulation theory, originally developed by G. B. Whitham in 1965. This talk will present a variety of developments and results in dispersive hydrodynamics utilizing Whitham modulation theory, numerical simulations, and experiment.
Zoom: https://northwestern.zoom.us/j/98867883380
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TIME Tuesday, March 4, 2025 at 11:15 AM - 12:15 PM
LOCATION M416, Technological Institute map it
CONTACT Ted Shaeffer ted.shaeffer@northwestern.edu EMAIL
CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)
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Mar11
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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To subscribe to the Applied Mathematics Colloquia List send a message to LISTSERV@LISTSERV.IT.NORTHWESTERN.EDU with the command:
add esam-seminar Youremail Firstname Lastname
TIME Tuesday, March 11, 2025 at 11:15 AM - 12:15 PM
LOCATION M416, Technological Institute map it
CONTACT Ted Shaeffer ted.shaeffer@northwestern.edu EMAIL
CALENDAR McCormick-Engineering Sciences and Applied Mathematics (ESAM)
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Mar15
EVENT DETAILS
Winter Classes End
TIME Saturday, March 15, 2025
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Mar17
EVENT DETAILS
Winter exams begin
TIME Monday, March 17, 2025
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Mar22
EVENT DETAILS
Spring Break Begins
TIME Saturday, March 22, 2025
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Mar31
EVENT DETAILS
Spring Break Ends
TIME Monday, March 31, 2025
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar