Weekly Colloquium

The Department hosts a weekly colloquium on Fridays at 2pm, usually in Southern Hall, room 303. If you would like to present, please contact Dr. Huiqing Zhu with a title and abstract. Please see our tips on abstracts below. You can also find links to previous years' titles and abstracts below.

DatePresenter, AffiliationTitle, Abstract
29 Apr 2016Dr. Sung Lee, USM

TBA

22 Apr 2016Dr. Raymond Atta-Fynn, University of Texas at Arlington

Materials Modeling via Dynamics

Sampling rare events and reconstructing the free energy along a path from an initial to a final state of physical and chemical processes is one of the principal goals of materials modeling. This can be achieved with a computational technique known as metadynamics, which allows efficient sampling and permits an accurate reconstruction of the free energy landscape with the aid of a small set of collective variables. This talk will provide a brief overview of the metadynamics method and how it is applied to molecular and solid state systems. Specific applications in the context of metal ion structure and hydrolysis in aqueous environments, and the generation of atomistic structures of amorphous semiconductors will be presented.

15 Apr 2016Dr. Paula Smithka, USM (Philosophy and Religion)

Dr. Who and Philosophy 101

Philosophy begins in wonder! (Aristotle said that). And Doctor Who certainly creates a sense of wonder in its companions. In this talk, I will provide a brief introduction to what philosophy is, the various areas of philosophical inquiry, and why Doctor Who is so very philosophical.

1 Apr 2016Dr. Carmen Wright, Jackson State University

The Generalized and Symmetric Spaces in \(\textrm{SL}_2(\mathbb F_q)\) and \(\textrm{GL}_2(\mathbb F_q)\)

We will discuss the generalized symmetric spaces for \(\textrm{SL}_2(\mathbb F_q)\) and \(\textrm{GL}_2(\mathbb F_q)\). Specifically, we will characterize the structure of these spaces, and prove that when the characteristic of \(\mathbb F_q\) is not equal to two, the extended generalized symmetric space is equal to the generalized symmetric space for \(\textrm{SL}_2(\mathbb F_q)\) and nearly equal for \(\textrm{GL}_2(\mathbb F_q)\).

11 Mar 2016Dr. Maarten Buijsman, USM (Marine Science)

The Propagation and Dissipation of Tidal Internal Gravity Waves in Numerical Simulations

As the surface tide propagates over underwater topography, energy is transferred to internal gravity waves that can propagate thousands of kilometers through an eddying ocean. Underway, these low-mode internal waves may scatter into high modes at steep topography, be affected by wave-wave interaction, and they may nonlinearly interact with the mesoscale eddy field. Their dissipation causes the mixing of water masses, sustaining the overturning circulation and affecting climate. It is not yet clear what their ultimate fate is. Do they dissipate their energy along the way or when they break on the continental shelves? In this talk I will address these questions with idealized numerical simulations and with the realistically forced Hybrid Coordinate Ocean Model, the operational forecast model of the US Navy.

4 Mar 2016Dr. Ras Pandey, USM (Physics and Astronomy)

Random walk, polymer chain, and protein by computer simulation experiments

Random walks are a classical mechanism for analyzing phenomena as diverse as stock market trends and information in cell phone chips. They give a starting point for exploring the structure and dynamics of systems with string-like constituents, such as polymer chains and proteins. While polymer chains' structure and dynamics are relatively well understood, the structure and dynamics of a protein remain an open problem. Issues include atomic scale structures, first principle force-fields, structure-based constraints, etc. We discuss protein folding, self-assembly, and network formation with specific examples (e.g. histone H3.1, lysozyme, alpha-synuclein), using a coarse-grained approach involving large-scale computer simulations.

12 Feb 2016Dr. Jiu Ding, USM

A Piecewise Quadratic Interpolation Method for the Computation of Stationary Densities

We propose a piecewise quadratic interpolation method that can be efficiently used to approximate a stationary density of Frobenius-Perron operators associated with interval mappings. The convergence of the method for the Lasota-Yorke class of piecewise stretching mappings is proved, and numerical results are also presented.
5 Feb 2016Dr. Bernd Schröder, USM

Every order-preserving self map of the \(L^p\) unit ball has a fixed point

This talk will give a brief introduction why fixed points are important, why \(L^p\) spaces are important and then proceed to prove that every order-preserving self map of the \(L^p\) unit ball has a fixed point. We will then talk about how this result is applied and how it could be extended.

Tips on abstracts

Dear speaker: We like to maintain a list of titles, topics, and abstracts, so that we (and you) have a record of who has visited and talked about which topic.

  • The topic should be short, similar to the headlines in the AMS subject classifications.
  • Please aim for no more than 100 words in your abstract. We're not fanatically rigorous about this, but an abstract should summarize the essence of a presentation, not give every detail. It’s a sales pitch, not a business plan. Keeping the abstract at 100 words also is a good preparatory step for a concise and informative talk that communicates the salient points of your work.
  • You may notice that we are MathJax-enabled, so feel free to use \(\mathrm{\LaTeX}\) markup in your abstract when appropriate.

Previous years' seminars

2015 · 2014 · 2013 · 2011-2013