Posted August 7, 2009

12:00 pm Johnston Hall 338
Jintao Cui, Mathematics Department, LSU

Introduction to LSU SIAM Student Chapter

The LSU SIAM Student Chapter is inviting all the students who are participating in the GEAUX program and Math Tune-up program to a pizza lunch and we would like to give a general introduction to the Chapter and our activities. You are all welcome to attend this event.

Posted July 27, 2009

Last modified July 28, 2009

Michele Benzi, Emory University

Key Moments In The History Of Numerical Analysis

The talk will highlight some of the key moments in the evolution of numerical analysis into an independent mathematical discipline. The necessary context and background behind technical developments will be carefully exposed, as well as biographical information about the major figures in the field. The main focus of the talk will be on the early history of matrix iterations.

Additional details can be found at http://www.cct.lsu.edu/events/talks/489

Posted September 9, 2009

3:30 pm Lockett Hall 233
Anna Zemlyanova, Department of Mathematics, LSU

Single- and double-spiral-vortex models for a supercavitating wedge in a jet

In this talk we study the effect which a cavity closure condition has on the flow of liquid around a supercavitating wedge in a jet. The comparison is made for the single- and double-spiral-vortex models proposed by Tulin. Both models are solved in closed form by the method of conformal mappings.

Posted September 22, 2009

Last modified September 23, 2009

Jacob Blanton, Mathematics Department, LSU

Max-Plus Algebra and Optimal Control Theory

A common approach to controlling nonlinear systems involves utilizing the dynamic programming principle (DPP). This approach leads to a control solution via the solution of a corresponding Hamilton-Jacobi (HJ) PDE. It has the advantage of yielding an optimal control solution as the value function of the control problem is interpreted as the viscosity solution of the associated HJ PDE. The semigroup that propagates the solutions of these PDE's is identical to the dynamic programming principle. The above will be surveyed along with an introduction to max-plus algebra in order to highlight the result that the semigroup associated with the HJ PDE's above is a max-plus linear operator.

Posted September 30, 2009

4:30 pm - 6:00 pm Johnston Hall 338I still don't know what you did last summer!

There will be a panel with students who participated in math related activities during the Summer 2009 sharing their experiences and explain how to apply for these programs. We hope that all Chapter members and graduate students would be benefitted from their experience. There will be a pizza dinner after.

Posted October 12, 2009

3:30 pm - 4:30 pm Lockett Hall 233
Rick Barnard, LSU Department of Mathematics
Advanced graduate student.

The Minimal Time Function and Stratified Domains

In this talk, we introduce the minimal time problem over a stratified domain. In such a problem, dynamical systems are regular only when restricted to a prescribed set of submanifolds. We show that the minimal time function satisfies an appropriate Hamilton-Jacobi equation.

Posted October 21, 2009

Last modified October 22, 2009

Sean Farley, Department of Mathematics, LSU
Graduate Student

An Introduction to TikZ: Integrating Graphics within LaTeX

While LaTeX is quite useful for typesetting math, it can be quite the pain for incorporating graphics. Which format do you save your image as? PDF? EPS? JPG? I will introduce a powerful package called TikZ that will enable you to seamlessly integrate graphics into your document. I will present examples in finite elements, beamer, and gnuplot.

Posted October 24, 2009

3:30 pm - 4:30 pm Lockett Hall 233
Santiago Fortes, Department of Mathematics, LSU

Subwavelength Plasmonic Crystals: Dispersion Relations and Effective Properties

: The possibility of engineering composite materials with unusual electromagnetic properties (a.k.a. metamaterials) has generated much interest lately. Devices such as invisibility cloaks and superlenses could, in principle, be constructed using such materials. One of the central ideas in the study of metamaterials is that radiation with wavelengths much larger than the inhomogeneities of the material cannot detect internal structure, so that the concepts of effective dielectric permittivity and effective magnetic permeability are valid. I will present a method for obtaining convergent power series representations for the fields and associated dispersion relations of electromagnetic waves propagating in a species of metamaterial known as plasmonic crystal.

Posted November 3, 2009

9:15 am - 10:15 am Johnston Hall 331
Fadil Santosa, Director, Institute for Mathematics and its Applications and School of Mathematics, University of Minnesota

Breakfast and Discussion

LSU SIAM Student Chapter presents a conversation with Prof. Fadil Santosa, the director of IMA (Institute for Mathematics and Applications). Breakfast will be served. It will be an informal meeting with him to talk about his career experience. This meeting is open to everyone.

Posted November 13, 2009

3:30 pm - 4:30 pm Lockett Hall 233
Lee Windsperger, Department of Mathematics, LSU

The Asymptotic Laplace Transform

The asymptotic Laplace transform is a generalization of the classical Laplace transform. Whereas the classical Laplace transform is an analytic tool to solve well-posed problems, the asymptotic Laplace transform is an analytic tool to solve ill-posed problems. This talk will introduce the definition, properties, and advantages of the asymptotic Laplace transform through two elementary partial differential equations.

Posted January 28, 2010

8:30 am Keisler Lounge, Lockett Hall 321.
Max Gunzburger, Florida State University

Conversation and Breakfast

Prof. Max Gunzburger from Florida State University is visiting LSU. The SIAM Student Chapter presents an informal conversation with him to talk about his career experiences. Breakfast will be served.

This meeting is open to everyone.

Posted March 3, 2010

Last modified March 6, 2010

Santiago Fortes, Department of Mathematics, LSU

Power Series Expansions for Waves in High-contrast Plasmonic Crystals (Dissertation Title)

ABSTRACT: the possibility of engineering composite materials with localized
internal resonances has generated much interest lately. In such materials, an
incoming electromagnetic field can become amplified by several orders of
magnitude. Numerical simulations indicate that a composite material known as
plasmonic crystal exhibits such resonances. I will present a method for
obtaining convergent power series representations for the fields and the first
branch of the associated dispersion relations of electromagnetic waves in
plasmonic crystals. The existence of these convergent series representations
precludes the possibility of internal resonances in the first branch of the
dispersion relation.

Light Refreshments will be served at the Keisler lounge at 1:30pm.

Posted March 16, 2010

Last modified March 18, 2010

LSU SIAM Chapter meets UIC Chapter - A Student Conference

The SIAM student chapter from the University of Illinois at Chicago is visiting us and we are having a series of student talks. After the talks we will have free pizza. Everyone is invited.

Speakers:

Jun Niu (UIC): Harmonic Series with Random Signs

We consider the harmonic series with random signs. We will discuss the
convergence and limit distribution of that summation. We will also show
that it has a continuous density function. Some basic probability theorems
and analytical techniques are involved.

Rick Barnard (LSU): Using Local Noise Characteristics in Denoising MALDI-TOF Mass Spectrometry

Matrix-Assisted Laser Desorption/Ionization
Time-of-Flight(MALDI-TOF) Mass Spectrometry is a useful technique for the
identification of polymers and other complex substances. However, noise
from background ions leads to the misidentification of false peaks in the
data (a crucial step in substance identification) and hides smaller,
albeit important, peaks. Current techniques for overcoming this either
involve large amounts of data, user interaction, or blindly smoothing out
data. This talk will present the advantages of using local properties of
the background ions in reducing the presence of background noise without
user bias and without excessive data.

Miao Xu (UIC): Asymptotics of the American CEV Options Pricing Model

We examine the early exercise policy and behavior of a one-asset American Option. In particular, we consider the Constant-Elasticity of Variance
(CEV) model in the case for β = 1 (the square root process), and we analyze
the optimal stopping region by ﬁnding the asymptotic behavior for times
close to expiration and at inﬁnite time to expiration.

Jintao Cui (LSU): Nonconforming Finite Element Methods for a Two Dimensional Curl-Curl and Grad-Div Problems

In this talk we discuss both a classical nonconforming ﬁnite element method and an interior penalty version for a two dimensional curl-curl and grad-div problem. The ﬁrst method is
based on a discretization using weakly continuous P1 vector ﬁelds and includes two consistency terms involving the jumps of the vector ﬁelds across element boundaries. The second
one uses discontinuous P1 vector ﬁelds and includes two additional over-penalization terms.
Optimal convergence rates (up to an arbitrary positive ϵ) in both the energy norm and the L 2
norm are established for both methods on graded meshes. We will present both theoretical
and numerical results. This is joint work with Susanne C. Brenner, Fengyan Li and Li-yeng Sung.

Posted March 25, 2010

Last modified April 27, 2010

Xin Li, Dept. of Elect. & Computer Engineering, LSU

Geometric Data Mapping through Shape Decomposition

**Abstract:**

With the rapid advancement of 3D scanning technologies, high-fidelity geometric datasets of huge size have been acquired through hardware devices. A fundamental and challenging problem is how to compute mapping to correspond different surface and volumetric objects of arbitrarily complicated topological types. Inter-shape mapping, or more specifically, finding a low distorted correspondence between two given shapes is a very powerful enabling tool for various applications. We seek accurate and efficient solutions to this fundamental and important problem. This talk is about our recent work on surface and volumetric mapping computation based on shape decomposition. Compared with existing techniques, our work offers a more effective solution. We envision broader application scopes of mapping in digital entertainment, modeling and simulation, vision, medical imaging, content-driven information retrieval, digital medicine, virtual environments, etc.

**Short Bio:**

Xin Li is an assistant Professor in Department of Electrical & Computer Engineering, and Center for Computation & Technology, and adjunct professor in Department of Computer Science. He received the Ph.D. (2008) and M.S. (2005) in Computer Science at Stony Brook University (SUNY), and the B.S. (2003) in Computer Science from University of Science and Technology of China. His research interests include computer graphics, geometric modeling and processing, computer aided design, vision, and visualization. For more information please visit http://www.ece.lsu.edu/xinli.

Posted April 21, 2010

Last modified May 4, 2010

Jintao Cui, Mathematics Department, LSU

Zuhal Yeter, LSU Dept of Mathematics

SIAM Student Seminar

**Zuhal Yeter: Robust Preconditioners for High Contrast Elliptic Equations**

The problem of interest is the elliptic PDEs with high contrast coefficients which models the applications such as fluid flow in highly heterogeneous media or bending of highly composite plates. The high contrast in the coefficients of the PDEs causes loss of robustness of the preconditioners.
Our aim is to construct preconditioner that is robust with respect to the coefficient contrast and mesh size and that will work for different kind of elliptic equations with varying discretizations. We prove the robustness of the preconditioner use singular perturbation analysis and numerically demonstrate it.

**Jintao Cui: Multigrid Methods for Maxwell's equations**

In this talk we discuss ﬁnite element methods for two-dimensional Maxwell's equations
and their solutions by multigrid algorithms. We ﬁrst study a nonconforming ﬁnite element
method on graded meshes for a two-dimensional curl-curl and grad-div problem. Then we
consider a class of symmetric discontinuous Galerkin methods for a model Poisson problem
on graded meshes that share many techniques with the nonconforming methods for Maxwell's
equations. We establish the uniform convergence of W -cycle, V -cycle and F -cycle multigrid
algorithms for the resulting discrete problems. Finally, we propose a new numerical approach
for two-dimensional Maxwell's equations that is based on the Hodge decomposition and
present multigrid results for Maxwell's equations.

Posted March 25, 2010

Last modified August 23, 2010

James Nagy, Emory University

Deblurring Images: Matrices, Spectra, and Filtering

Abstract: When we use a camera, we want the recorded image to be a faithful representation of the scene that we see, but every image is more or less blurry. In image deblurring, the goal is to recover the original, sharp image by using a mathematical model of the blurring process. The key issue is that some information on the lost details is indeed present in the blurred image, but this "hidden" information can be recovered only if we know the details of the blurring process. In this talk we describe the deblurring algorithms and techniques collectively known as spectral filtering methods, in which the singular value decomposition (or a similar decomposition with spectral properties) is used to introduce the necessary regularization or filtering in the reconstructed image.

(Light refreshments at 10:30)

Posted October 27, 2010

11:00 am 338 Johnston Hall
Jiawang Nie, Department of Mathematics at UCSD

Introduction to Polynomial Optimization

This talk presents recent work on solving multivariate polynomial

optimization problems by using semi definite programming (SDP) and sum of

squares (SOS) techniques. The talk focuses on Lasserre type SDP relaxation:

sum of squares polynomials, Lasserre's relaxation hierarchy, its convergence,

and approximation performance analysis.

**Pizza will be served** after the talk.

Posted December 7, 2010

Last modified December 21, 2010

Michael Ruge, SIEMENS AG, Munich, Germany

Mathematicians in Industry at Siemens

This presentation is directed at an audience (Mathematicians, Natural Scientists, Engineers) interested at a career in industry, possibly with an international focus.

The presenter will present an overview of the company Siemens he works for close to twenty years with a focus on entry-level positions for master and doctorial graduates.

Posted January 27, 2011

4:00 pm - 5:00 pm 338 Johnston Hall
Thomas Sterling, Louisiana State University

Enabling Exascale Computing through the ParalleX Execution Model

Posted February 15, 2011

3:30 pm 338 Johnston HallLSU SIAM Student Chapter Webpage Design Workshop

LSU SIAM Student Chapter is organizing a personal webpage construction and design workshop. The speakers (Jeff Sheldon, Heather Russell and Laura Rider) will discuss setting up department based websites, basic commands in webpage design and webpages for job applications.

Posted February 14, 2011

2:00 pm - 3:00 pm 233 Lockett
Andrew Barker, Louisiana State University

Evolutionary Game Theory and the Traveler's Dilemma

Posted February 7, 2011

11:00 am - 12:00 pm 338 Johnston Hall
Mac Hyman, Tulane University

Good Choices for Great Careers in the Mathematical Sciences

The choices that students make early in their careers will impact them for a lifetime. I will use the experiences of scientists who have had great careers to identify universal distinguishing traits of good career choices that can guild decisions in education, choice of profession, and job opportunities to increase your chances of having a great career with long-term sustained accomplishments. I ran a student internship program at Los Alamos National Laboratory for over 20 years. For the last couple of years I have been tracking the careers past students and realized that the scientists with great careers weren't necessarily the top students, and that some of the most brilliant students now had some of the most oh-hum careers. I will describe how the choices made by the scientists with great careers were based on following their passion, building their talents into a strength supporting their profession, and how they identified a supportive engaging work environment. I will describe some simple guidelines that can help guide your choices, in school and in picking the right job that can lead to a rewarding career and more meaningful life. The topic is important because, so far as I can tell, life is not a trial run - we have one shot to get it right. The choices you are making right now to planning your career will impact your for a lifetime. Please join us for an engaging discussion on how to make the choices that will lead to a great career.

Posted October 3, 2011

9:00 am - 10:30 am Johnston Hall 338
Luke Owens, Automated Trading Desk

Who Wants to be a Millionaire? A Path to Riches Through A Career in Quantitative Finance

Posted August 31, 2011

Last modified September 22, 2011

William Hager, University of Florida

Numerical Techniques In Optimal Control

Abstract: The talk gives an overview of some discrete approximation techniques that have been developed for optimal control problems. We focus in particular on Runge-Kutta discretizations and more recent work on pseudospectral schemes. The numerical paradigm consistency + stability => convergence is explained in the context of these discretizations. Gradient techniques for solving the discretized problems will also be discussed. Additional details can be found at http://www.cct.lsu.edu/events/talks/584

Posted December 5, 2011

9:00 am - 10:30 am 338 Johnston HallA Conversation with Carol Woodward

This is breakfast event with Carol S. Woodward (Lawrence Livermore National Laboratory). Dr. Woodward received a B.S. in Mathematics from LSU in 1991 and a Ph.D. in Computational Science and Engineering from Rice University in 1996. Since June 1996, she has been a computational scientist with the Center for Applied Scientific Computing at Lawrence Livermore National Laboratory. This event is hosted by the SIAM Student Chapter and the VIGRE Program.

Posted February 11, 2014

9:30 am - 10:30 am Lockett Hall Keisler LoungeA Conversation with Dr. Pavel Bochev

Posted January 26, 2015

3:30 pm - 4:30 pm Lockett 233
Ata Mesgarnejad, Louisiana State University

A variational approach to fracture of thin films under out-of-plane loading

Posted March 12, 2015

Last modified March 18, 2015

Robert P. Viator, Jr., LSU

Perturbation Theory for High-Contrast Photonic Crystals

Abstract: Transverse-electric Bloch-wave modes propagating through a high-contrast photonic crystal are analyzed. A power series for the frequency ω^2 terms of the high-contrast parameter z is established, along with a radius of convergence. The radius of convergence is controlled by eigenvalues (called quasi-static resonances) from a related spectral problem in the quasi-periodic Sobolev space, which are obtained via Layer Potentials.

Posted March 22, 2015

9:00 am - 10:00 am Keisler Lounge, 321 LockettA Conversation with Professor Peter Kuchment

Posted April 13, 2015

9:00 am - 10:00 am Keisler Lounge, 321 LockettA Conversation with Professor Clint Dawson

Posted September 17, 2015

2:30 pm - 3:30 pm Keisler Lounge (321 Lockett Hall)Semester Kick-Off Event: Why We Do Applied Mathematics

Come learn about the SIAM Student Chapter. Some of our members will
talk about their research.

Refreshments will be provided.

Posted November 19, 2015

3:30 pm - 4:30 pm Keisler LoungeApplied Mathematics Student Talks

Posted February 9, 2016

11:00 am - 12:00 pm Keisler LoungeA Conversation with Professor James Nagy (Emory University)

Posted August 29, 2017

12:00 pm - 1:00 pm Keisler Lounge (Lockett 321)What I Did This Summer

Undergraduate and graduate students will give presentations about their

summer math experiences.

Posted November 3, 2017

Last modified November 9, 2017

Xiao-Chuan Cai, University of Colorado Boulder

A Conversation with Prof. Xiao-Chuan Cai

The LSU SIAM Student Chapter is pleased to invite everyone, students and faculty, to a breakfast with Prof. Xiao-Chuan Cai to have a nice conversation about his career and work. His research interests are in the area of scientific and engineering computing including domain decomposition and multigrid methods for linear and nonlinear partial differential equations.