Seminars and Colloquia by Series

Zak transform analysis of shift-invariant subspaces

Series
Analysis Seminar
Time
Wednesday, August 23, 2017 - 14:05 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
Joey Iverson – University of Maryland
Abstract: Shift-invariant (SI) spaces play a prominent role in the study of wavelets, Gabor systems, and other group frames. Working in the setting of LCA groups, we use a variant of the Zak transform to classify SI spaces, and to simultaneously describe families of vectors whose shifts form frames for the SI spaces they generate.

Around a big mapping class group

Series
Geometry Topology Seminar
Time
Tuesday, August 22, 2017 - 11:00 for 1 hour (actually 50 minutes)
Location
Skiles 006
Speaker
Juliette Bavard – University of Chicago
The mapping class group of the plane minus a Cantor set naturally appears in many dynamical contexts, including group actions on surfaces, the study of groups of homeomorphisms on a Cantor set, and complex dynamics. In this talk, I will present the 'ray graph', which is a Gromov-hyperbolic graph on which this big mapping class group acts by isometries (it is an equivalent of the curve graph for this surface of infinite topological type). If time allows, I will give a description of the Gromov-boundary of the ray graph in terms of long rays in the plane minus a Cantor set. This involves joint work with Alden Walker.

Workshop on Dynamics and Control

Series
GT-MAP Seminar
Time
Thursday, August 17, 2017 - 09:00 for 8 hours (full day)
Location
Klaus 2447
Speaker
Various Speaker – Different units of GT
The workshop will launch the thematic semesters on Dynamics (Fall 2017) and Control (Spring 2018) for GT-MAP activities. This is a two-day workshop, the first day focusing on the theme of Dynamics, and the second day focusing on the theme of Control. There will be light refreshments throughout the event. The workshop will be held in the Klaus building Room 2447. More information at http://gtmap.gatech.edu/events/gt-map-workshop-dynamics-and-control

Did you say Brouwer?

Series
Geometry Topology Seminar
Time
Monday, August 14, 2017 - 14:11 for 1 hour (actually 50 minutes)
Location
Skiles 006
Speaker
Albert Fathi – Georgia Tech
We will give different topological very simple statements that seem not to have been noticed, although they are of the level of Brouwer’s fixed point theorem. The main result is: Let F be a compact subset of the manifold M. Assume g:F->M is a continuous map which is the identity on the boundary (or frontier) of F, then the image g(F) contains either F or M\F.

Workshop on Dynamical Systems

Series
GT-MAP Seminar
Time
Thursday, August 10, 2017 - 10:54 for 8 hours (full day)
Location
Klaus 1447
Speaker
Various Speakers – From various places
GT MAP sponsored "Workshop on Dynamical Systems" to mark the retirement of Prof. Shui Nee Chow. Full day August 10- 11. After nearly 30 years at Georgia Tech, Prof. Shui Nee Chow has officially retired. This workshop will see several of his former students, post-docs, and friends, coming together to thank Shui Nee for his vision, service, and research, that so greatly impacted the School of Mathematics at Georgia Tech. The workshop will be held in the Klaus building Room 1447. More information at http://gtmap.gatech.edu/events/workshop-dynamical-system

SIAM Conference on Applied Algebraic Geometry

Series
Other Talks
Time
Monday, July 31, 2017 - 09:00 for 8 hours (full day)
Location
Clough 152 (plenary talks), Skiles (parallel sessions)
Speaker
SIAM AG 2017 – Georgia Tech
Georgia Tech is the site of the 2017 SIAM Conference on Applied Algebraic Geometry (July 31 to August 4). This biennial meeting is an activity of the Activity Group in Applied Geometry of SIAM, the Society for Industrial and Applied Mathematics. The SIAM Activity Group in Algebraic Geometry aims to bring together researchers who use algebraic geometry in industrial and applied mathematics. "Algebraic geometry" is interpreted broadly to include at least algebraic geometry, commutative algebra, noncommutative algebra, symbolic and numeric computation, algebraic and geometric combinatorics, representation theory, and algebraic topology. These methods have already seen applications in biology, coding theory, cryptography, combustion, computational geometry, computer graphics, quantum computing, control theory, geometric design, complexity theory, machine learning, nonlinear partial differential equations, optimization, robotics, and statistics. School of Mathematics professors Greg Blekherman, Anton Leykin, and Josephine Yu lead the local organizing committee.

Applied Macaulay2 Tutorials

Series
Other Talks
Time
Thursday, July 27, 2017 - 09:00 for 8 hours (full day)
Location
Skiles 005 and 006
Speaker
Macaulay2 – Georgia Tech
Dates: July 27-29 (Thu-Sat). Schedule will appear here. These tutorials are intended to appeal to participants with any level of prior M2 experience. The topics will range from the basic functionality of M2 to modeling problems in the M2 language to more specialized tutorials on algebraic statistics and numerical algebraic geometry. We will also reserve ample time for practice and Q&A sessions. Registration is free, but please fill the form here.

Invariant manifolds in energy harvesting coupled oscillators

Series
CDSNS Colloquium
Time
Tuesday, July 25, 2017 - 11:00 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
Albert Granados – Department of Applied Mathematics and Computer Science, Technical University of Denmark
When perturbed with a small periodic forcing, two (or more) coupledconservative oscillators can exhibit instabilities: trajectories thatbecome unstable while accumulating ``unbounded'' energy from thesource. This is known as Arnold diffusion, and has been traditionallyapplied to celestial mechanics, for example to study the stability ofthe solar system or to explain the Kirkwood gaps in the asteroid belt.However, such phenomenon could be extremely useful in energyharvesting systems as well, whose aim is precisely to capture as muchenergy as possible from a source.In this talk we will show a first step towards the application ofArnold diffusion theory in energy harvesting systems. We will consideran energy harvesting system based on two piezoelectric oscillators.When forced to oscillate, for instance when driven by a small periodicvibration, such oscillators create an electrical current which chargesan accumulator (a capacitor or a battery). Unfortunately, suchoscillators are not conservative, as they are not perfectly elastic(they exhibit damping).We will discuss the persistence of normally hyperbolic invariantmanifolds, which play a crucial role in the diffusing mechanisms. Bymeans of the parameterization method, we will compute such manifoldsand their associated stable and unstable manifolds. We will alsodiscuss the Melnikov method to obtain sufficient conditions for theexistence of homoclinic intersections.

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