Eric Sembrat's Test Bonanza

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Nonlinear thermoacoustics: flames on the edge of chaos

Abstract

Thermoacoustic oscillations occur when a flame is confined within an acoustic cavity, such as a combustion chamber. Their amplitude grows if the oscillating flame releases more heat at times of higher pressure and less heat at times of lower pressure. The phase between the pressure and the additional heat release is critical. It can vary from cycle to cycle, resulting in quasiperiodic, multi-periodic, or chaotic oscillations, as observed in experiments and numerical simulations.

Quantum Chaos, Thermalization, and Localization

Abstract

Will discuss chaos in quantum many-body systems, specifically how it is relates to thermalization and how it fails in many-body localized states. I will conjecture a new universal form for the spreading of chaos in local systems, and discuss evidence for the conjecture from a variety of sources including new large-scale simulations of quantum dynamics of spin chains.

Physics Professor Joins ScienceMatters Hall of Fame

Friday, October 26, 2018

Georgia Tech's Elisabetta "Sabetta" Matsumoto is the winner of the ScienceMatters Episode 9 quiz. An assistant professor in the School pf Physics, Matsumoto is our first winner from among the Georgia Tech faculty. 

Matsumoto walks to work and back, and she enjoys running in Piedmont Park. "That's usually when I listen to podcasts," she says. She says she has listened to about six episodes of ScienceMatters. "I really enjoy getting to see work of my friends and colleagues getting publicized." 

Matsumoto joined Georgia Tech in 2016. Her research centers around the relationship between geometry and material properties in soft systems, including liquid crystals, 3D printing, and textiles. She uses techniques from differential geometry and geometric topology to develop a mathematical underpinning for these materials. She is also interested in using knitting, sewing, 3D printing, and virtual reality in mathematical art and education.

The Episode 9 quiz question: What group of people can’t tell the difference between a coffee cup and a donut?

The answer: topologists.

Episode 10 of ScienceMatters is out this week. "Chasing Cancer with Gold" stars Mostafa El-Sayed, professor in the School of Chemistry and Biochemistry.

If you would like to join the ScienceMatters Hall of Fame, enter the answer to this question: What is the name of Mostafa El Sayed’s son who is also his collaborator in cancer research?

Submit your answer by 11 a.m. Monday, October 29, at sciencematters.gatech.edu..

Media Contact: 

A. Maureen Rouhi, Ph.D.
Director of Communications
College of Sciences

Alumni: 

Asymmetric Granular materials

Abstract

My focus at RIT has been on radically non-spherical (asymmetric or anisometric) granular materials including long, thin cylinders, U-shaped staples and C-shaped annular-sector particles (ASPs). In this talk I’ll discuss three different experiments and simulations: 1) extensional rheology of 3d piles, 2) the influence container boundaries have on rod packings and 3) dimerization of ASPs under 2d shear. Extensional rheology is made possible by shape-dependent particle entanglement and can be explained using Weibullian weakest-link statistics.

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