Archive of Previous Seminars – Computational and Applied Math Seminar

Spring 2023

Jan 30 | Nisha Chandramoorthy (Georgia Tech) | “Learning from dynamics and the dynamics of learning”
Feb 6 | Xuefeng Xu (Tufts) | “Convergence of Two-level Iterative Methods”
Feb 13 | Malbor Asllani (Florida State University) | “Nonlinear random walks: from network reconstruction to epidemics spreading”
Feb 27 | Zhiyuan Zhang (NYU) | “Equilibrium and Stability of Plasma Modeled by the Relativistic Vlasov-Maxwell System”
Mar 6 | Lilla Orr (University of Richmond) | “The nature of social animosity between partisans in the United States”
Mar 13 | Spencer Smith (Mt. Holyoke) | “Maximally Mixing Braids And Their Physical Realization In Active Nematic Systems”
Mar 27 | Paola Sebastiani (Tufts Med) | “Computational Challenges in Studies of Extreme Longevity”
Apr 3 | Chun Liu (IIT) | “Temperature effects for general diffusion and chemical reaction dynamics”
Apr 10 | Marc Hodes (Tufts ME) | “Adiabatic Section Flow Resistance of Axial-Groove Heat Pipes for Slowly-Varying Meniscus Curvature”
Apr 24 | Chaitanya Joshi (Tufts) | “Morpho – A programmable environment for shape optimization and shape-shifting problems”
May 1 | Wenjun Zhao (Brown) | “Wasserstein barycenter for conditional density estimation and simulation”

Fall 2022

Sep 19 | Chris Dock (Tufts) | “Lipschitz stability of U(r) Phase Retrieval”
Sep 26 | Clare Wickman Lau (JHU APL) | “Wasserstein Gradient Flows for Potentials in Frame Theory”
Oct 3 | Noel Walkington (CMU) | “Numerical Approximation of Multiphase Flows in Porous Media”
Oct 11 | Erin C. Munro Krull (Ripon College) | “Why strengthening electronic connections between cells may hinder propagation between them.”
Oct 17 | Yekaterina Epshteyn (University of Utah) | “Grain Structure, Grain Growth and Evolution of the Grain Boundary Network”
Oct 24 | Karamatou Yacoubou Djima (Wellesley) | “Extracting Autism’s Biomarkers in Placenta Using Multiscale Methods”
Oct 31 | Hung M. Phan (UMass Lowell) | “Splitting algorithms and applications in spatial design problems.”
Nov 7 | Patrick Farrell (Oxford) | “Optimal-complexity multigrid Solvers for high-order discretisations of the de Rham Complex”
Nov 14 | Arkadz Kirshtein (Tufts) | “Biomedical and Physical Applied Modeling”
Nov 21 | Radu Balan (UMD) | “Optimal l1 factorizations of positive semidefinite matrices”
Nov 28 | Tal Shnitzer (MIT) | “Diffusion Operators for Data Fusion with Symmetric Positive Definite Geometry”

Spring 2022

Jan 31 | Ioannis Vlachos (BIDMC, Harvard) | “Spatial Tissue Profiling: The resolution revolution and first major challenges”
Feb 7 | Casey Cavanaugh (Tufts) | “Structure-preserving discretizations for partial differential equations”
Feb 14 | Shawn D. Ryan (CSU) | “Mathematics Provides Insight into Self-Organization in Biological Systems”
Feb 28 | Anna Haensch (DISC, Tufts) | “How to Hang Art: A Recommender System for Equitable Public Art Installation”
Mar 7 | Mirjeta Pasha (Arizona State University) | “On deterministic and statistical methods for large-scale dynamic inverse problems”
Mar 14 | Monika Nitsche (University of New Mexico) | “Accurate near-interface velocity evaluation in vortex sheet and multi-nested Stokes flow”
Mar 28 | Olga Doronina (NREL) | “Grassmannian Shape Representations for Aerodynamic Applications”
Apr 4 | Enric Boix (MIT) | “Polynomial-Time Algorithms for Multimarginal Optimal Transport Problems with Structure”
Apr 11 | Maria Teresa Chiri (Penn State) | “Controlling the spread of invasive biological species”
Apr 25 | David Emerson | “Deflation and Continuation Techniques for Detecting Liquid Crystal Equilibrium States”
May 2 | Maryam Abdolali (Université de Mons) | “Subspace Clustering: Algorithms, Applications and Challenges”

Fall 2021

Sep 20 | Weilin Li (Courant Institute) | “Generalization error of minimum weighted norm and kernel interpolation”
Sep 27 | Christopher Rycroft (Harvard) | “Uncovering the rules of crumpling with a data-driven approach”
Oct 4 | Yulong Lu (UMass Amherst) | “A priori generalization error analysis of neural network methods for solving high dimensional elliptic PDEs”
Oct 18 | Zhongqiang Zhang (WTI) | “Error estimates for DeepONets and PINNs”
Oct 25 | Yeonjong Shin (Brown) | “Mathematical approaches for robustness and reliability in scientific machine learning”
Nov 1 | Abiy Tasissa (Tufts) | “K-Deep Simplex: Structured Manifold Learning with Simplex Constraints”
Nov 8 | Nick Derr (Harvard) | “A projection method for porous media simulation”
Nov 15 | Lina Ma (Trinity College) | “Coarse-graining Langevin Dynamics”
Nov 29 | Konstantinos Spiliopoulos (BU) | “PDE-constrained Models with Neural Network Terms: Optimization and Convergence Properties”
Dec 6 | Natasa Dragovic (Tufts) | “Poisson Point Process under the Opinion Dynamics”

Spring 2021

Feb 1 | Ousmane Kodio (MIT) | “Dynamic buckling instabilities”
Feb 8 | Emily King (Colorado State) | “Low Complexity Models in Data Analysis”
Feb 22 | Rongrong Wang (Michigan State) | “Manifold Denoising by Nonlinear Robust Principal Component Analysis”
Mar 1 | Jeff Calder (UMN) | “Random walks and PDEs in graph-based learning”
Mar 8 | Leili Shahriyari (UMass) | “Data Driven Mathematical Model of Colon Cancer Progression”
Mar 15 | Benjamin Haeffele (JHU) | “Topics in Unsupervised Representation Learning: Structured Matrix Factorization and a Cautionary View of Deep Clustering.”
Mar 22 | Chun Liu (IIT) | “Energetic Variational Approaches (EnVarA) for Active Materials and Reactive Fluids”
Mar 29 | Robert Eisenberg (Rush, IIT) | “Maxwell Equations Imply Exact and Universal Conservation of Total Current, Independent of the Properties of Matter”
Apr 5 | Ehsan Elhamifar (Northeastern) | “Dynamic Subset Selection: Algorithm, Theory and Applications”
Apr 12 | Palina Salanevich (Utrecht) |”Stability of the phase retrieval problem: structure and randomness”

Fall 2020

Sep 28 | Vince Lyzinski (UMD) | “The Importance of Being Correlated: Implications of Dependence in Joint Spectral Inference across Multiple Networks”
Oct 5 | Howard Elman (UMD) | “A Low-Rank Solver for the Stochastic Unsteady Navier-Stokes Problem”
Oct 19 | Rongjie Lai (RPI) | Chart Auto-encoder for Manifold-Structured Data
Oct 26 | Gal Mishne (UCSD) | “Multiway Tensor Analysis with Neuroscience Applications”
Nov 2 | Sui Tang (UCSB) | “Learning interaction laws in multi-agent systems from data”
Nov 9 | Bahareh Tolooshams (Harvard) | “On the relationship between dictionary learning and sparse autoencoders”
Nov 16 | Kasso Okoudjou (Tufts) | “Optimal l1 rank one matrix decomposition”
Nov 24 | Michael Perlmutter (UCLA) | “Understanding Convolutional Neural Networks via Scattering”
Nov 30 | Rachel Ward (UT Austin) | “Stochastic Gradient Descent: From Practice Back to Theory”
Dec 7 | Monika Nitsche (UNM) | “Evaluation of near-singular integrals with application to vortex sheet and Stokes flow”
Dec 14 | Eyal Neuman (Imperial) | “Scaling Properties of a Moving Polymer”

Spring 2020

Jan 27 | Arkadz Kirshtein (University of Massachusetts Amherst) | “Modeling and computations of multi-component fluid flow.”
Feb 3 | Chao Chen (UT Austin) | ” Parallel Hierarchical Solver with Applications to Ice Sheet Modeling.”
Feb 10 | Daniel Szyld (Temple) | “One- and Two-level Asynchronous Optimized Schwarz Methods for the solution of PDEs.”
Mar 2 | Jie Chen (IBM) | “Deep Learning with Graph Structured Data: Methods, Theory, and Applications.”
Mar 9 | Farhad Pourkamali Anaraki (U Mass Lowell) | “Improved Fixed-Rank Nystrom Approximation with Application to Spectral Clustering.”

Fall 2019

Sep 23 | Jan Nordbotten (U. Bergen, Norway) | “Mixed-dimensional Modeling and Simulation.”
Sep 30 | Demba Ba (Harvard)| “Deeply-Sparse Signal Representations.”
Oct 7 | Michael Mascagni (FSU) | “The White Rat of Numerical Reproducibility.”
Oct 21 | Abiy Tasissa (Tufts) | “Reconstructing point sets using low-rank regularization.”
Nov 04 | Julio Castrillon (BU) | “Large Scale Kriging: A High Performance Multi-Level Computational Mathematics Approach.”
Nov 18 |Bruce Boghosian (Tufts) | “A new pathology in floating-point simulations of chaotic dynamical systems.”
Nov 25 | Andrea Arnold (WPI) | “Estimation and Uncertainty Quantification of Time-Varying Parameters via Parameter Tracking.”
Dec 02 | Nathaniel Trask (Sandia National Lab) | “Compatible meshfree discretization.
Dec 9 | Yanghui Liu (Tufts)| “Anticipative Nonlinear Filtering.”

Spring 2019

Feb 4 | Daniel Sussman (BU) | “Multiple Network Inference: From Joint Embeddings to Graph Matching.”
Feb 11 | Maurice Fabien (Rice) | “Multigrid techniques for high-order discontinuous Galerkin methods with application to porous media flows.”
Mar 4 | Carmen Rodrigo (Zaragoza, Spain) | “Robust multigrid solver for mixed-dimensional models for flow in fractured porous media.”
Mar 11 | Zhiping Mao (Brown) | “Efficient and Accurate Single/Multi-domain Spectral Methods for Fractional Diffusion Equations.”
Mar 25 | Anna Little | “Theoretical Guarantees and Exact Cluster Recovery for Classical Multidimensional Scaling.”
Apr 3 | Lisa Claus (Wuppertal, Germany) | “Algebraic Multigrid Smoothers for Maxwell’s equations.”
Apr 24 | James Brannick (Penn State) | “Algebraic Multigrid: Theory and Practice.”
Apr 29| Xu Zhang (Miss. St.) | “Immersed Finite Element Method for Interface Problems: Basic Idea, Algorithm Development, Error Analysis, and Applications.”

Fall 2018

Sep 17 | Ana Budiša (U. Bergen, Norway) | “Domain decomposition preconditioner for mixed-dimensional flow problems in fractured porous media.”
Oct 01 | Tim Atherton (Tufts) | “Morpho—A system for solving shape optimization problems.”
Oct 15 | Guosheng Fu (Brown University) | “Explicit divergence-free DG methods for incompressible flow.”
Oct 22 | Jeff Hokanson (University of Colorado, Boulder) | “Exploiting Ridge Structure in Chance Constrained Design Under Uncertainty.”
Oct 29 | Fleurianne Bertrand (Humboldt University in Berlin) | “Stress Reconstruction for Elasticity Problems.”
Nov 05 | Howard Elman (University of Maryland) | “Collocation Methods for Exploring Perturbations in Linear Stability Analysis.”
Nov 19 | James Murphy (Tufts) | “Unsupervised Geometric Learning: Statistical Guarantees and Fast Algorithms.”
Nov 26 | Helen Suh (Tufts – CEE) | “Current Analytical Challenges in Air Pollution Epidemiology.”
Dec 03 | Sohom Ray (Tufts – CEE) | “Earthquake Nucleation on Faults: a Finite-Time Instability Problem.”
Dec 10 | John Germaine (Tufts – CEE) | “Stress Dependent Mechanical Behavior of Clay Rich Sediments.”

Spring 2018

Jan 22 | Everyone (Tufts) | Organizational Meeting.
Feb 05 | Richard Hooper (Tufts – CEE) | “The Tyranny of Physics: Are we fooling ourselves in making Earth system predictions?”
Feb 12 | Leone Brown (Tufts – Bio) | “Animal migration and disease risk in response to anthropogenic change.”
Feb 26 | Elizabeth Crone (Tufts – Bio) | “Mixed use landscapes can facilitate range shifts.”
Mar 05 | Hengjie Wang (UC Irvine) | “An efficient geometric multigrid solver for variable coefficient poisson equation.”
Mar 12 | Steven Wise (UT Knoxville) | “Preconditioned descent methods for some nonlinear elliptic equations involving p-Laplacian terms.”
Apr 02 | Steffen Muenzenmaier (University Duisburg-Essen) | “An upwinded discontinuous Least-squares finite element method for steady-state transport.”
Apr 02 | Hongyan Wang (Tufts) | “The finite-element algorithm for the extended yard-sale model.”
Apr 09 | Johannes Kraus (University Duisburg-Essen) | “A posteriori error estimates for a class of nonlinear interface problems in relation to solving the Poisson-Boltzmann equation.”
Apr 23 | Boris Krämer (MIT) | “Conditional-value-at-risk estimation with reduced-order models.”

Fall 2017

Sep 13 | Everyone (Tufts) | Organizational Meeting.
Sep 18 | Peter Ohm (Tufts) | “New Stabilized Discretizations for Poroelasticity and the Stokes’ Equations.”
Oct 13 | Pasqua D’Ambra (National Research Council of Italy) | “BootCMatch: Bootstrap AMG based on Compatible Weighted Matching.”
Oct 20 | Qing Nie (University of California, Irvine) | “Data-driven multiscale modeling of cell fate dynamics.”
Oct 25 | Jeff Hokanson (University of Colorado, Boulder) | “Data-driven polynomial ridge approximation using variable projection.”
Oct 30 | David Emerson (StreetContxt) | “A Posteriori Error Estimators for Variational Systems.”
Nov 20 | Caleb Magruder (Tufts) | “Adjoint-Based Differentiation for Optimization with Implicit Constraints.”
Nov 27 | Amanda Howard (Brown University) | “Particle Dispersion in Non-Homogeneous Suspension Flows.”

Spring 2017

Mar 13 | Francisco Gaspar (Zaragoza) | “Multigrid Waveform Relaxation. Application to the Time-Fractional Heat Equation.”
Apr 05 | Peiyao Luo | “Monolithic Multigrid Method for the Coupled Stokes Flow and Deformable Porous Medium System.”

Fall 2016

Sep 07 | Everyone (Tufts) | Organizational Meeting
Sep 14 | James Adler (Tufts) | “How Not to Give a Talk”
Sep 21 | Everyone (Tufts) | 5 Minute Talks
Sep 28 | Sergey Voronin (Tufts) | “Efficient methods for the construction of low rank matrix decompositions and applications to inverse problems and parameter estimation.”
Oct 19 | Julio Castrillon-Candas | “Analytic regularity and collocation approximation for elliptic PDEs with random domain deformations.”
Oct 26 | Hui Yang (Tufts) | “Mechanics of high-capacity anode materials in lithium-ion nano-batteries.”
Nov 2 | Jeffrey Guasto (Tufts) | “Porous media flows: From swimming cells to complex fluids.”
Nov 9 | Luis Dorfmann (Tufts) | “The elastic secrets of the chameleon tongue.”

Spring 2016

Jan 27 | Everyone (Tufts) | Organizational Meeting
Feb 03 | James Adler (Tufts) | Tips for Giving Talks
Feb 10 | Everyone (Tufts) | 3 Minute Talks
Feb 16 | Long Chen (UC Irvine) | “Multigrid Methods for Saddle Point Systems of Mixed Finite Element Methods”
Mar 2 | Peter Love (Tufts) | “A Quantum Algorithm for the Moebius Function”
Mar 9 | Saheli Sarkar (Northeastern) | “Phenotypic analysis of cancer-immune interactions at single cell level.”
Mar 16 | Lake Bookman (Yale) | “Approximate Solitons of the Landau-Lifshitz Equation”
Mar 30 | Grant Garven (Tufts) | “Mathematical Models for Deep Fluid Migration in the Earth’s Crust”
Apr 06 | Marc Hodes (Tufts) | “Effect of Thermocapillary Stress on Slip Length for a Parallel Ridge-Textured Channel”

Fall 2015

Sep 09 | Everyone (Tufts) | Organizational Meeting
Sep 23 | Paul Hand (Rice) | “ShapeFit: Exact location recovery from corrupted pairwise directions.”
Sep 30 | Elizabeth Wu (Tufts) | “The Investigation of Differential Operator Based on Fast Fourier Continuation and Sobolev Smoothing.”
Oct 7 | Peter Ohm (Tufts) | “Statistical Thermodynamics and Modeling Chemical Activity Coefficients.”
Oct 28 | David Emerson (Tufts) | “A Deflation Technique for the Computation of Static Liquid Crystal Configurations.”
Nov 10 | Charlie Colley (Tufts) | “Data Perturbation Technique for Improving Clustering Objective Functions.”
Nov 20 | Howard Elman (Maryland) | “Linear Algebra Computations for Parameterized Partial Differential Equations.”
Dec 02 | Melody Takeuchi (Tufts) | “Abrupt Transitions from Low to High Firing Frequencies in Neuronal Models.”
Dec 09 | Tim Atherton (Tufts) | “Order, Geometry, and Dynamics in Soft Matter.”

Spring 2015

Feb 04 | Joanne Lin (Tufts) | “A Contagion Model of Emergency Airplane Evacuations”
Feb 11 | Thomas Benson (Tufts) | “Introduction to the Cluster”
Feb 18 | Robert Viesca (Tufts) | “Of Faults and Faucets”
Feb 25 | Tom Vandervelde and Maggie Stevens (Tufts) | “Studying Anomalous Open-Circuit Voltage Drop-Out in Concentrated Photovotaics Using Computational Numerical Analysis.”
Mar 25 | Arvind Krishna Saibaba (Tufts) |”Fast Kalman Filter for Random Walk Forecast Model.”
Apr 01 | Tania Bakhos (Stanford) | “Flexible Krylov Solvers for Shifted Systems with Applications to Solving Large-Scale Inverse Problems.”
Apr 08 | Xuan Zhao | “An Introduction to Fractional PDEs: Applications and Numerics.”
Apr 15 | Maria Elenius (Tufts) | “Carbon Dioxide Mineralization in the Presence of Convective Mixing and the Capillary Transition Zone”
Apr 22 | Jayanth Jagalur-Mohan | “Approximate Optimal Projection for Reduced-Order Models”

Fall 2014

Sep 11 | James Adler (Tufts) | “Intro to Finite Elements”
Sep 18 | David Emerson (Tufts) “Intro to Liquid Crystals”
Sep 25 | Xiaozhe Hu (Tufts) | “Intro to Geometric Multigrid”
Oct 02 | Bruce Boghosian (Tufts) | “Intro to Lattice Boltzman”
Oct 09 | Ilya Lashuk (Tufts) | “Intro to Algebraic Multigrid/Smoothed Aggregation”
Oct 16 | James Adler (Tufts) | “Discussion of Finite Elements for Dissipative Maxwell’s Equations.”
Oct 23 | David Emerson (Tufts) | “Intro to Trust Region Optimization.”
Oct 30 | Xiaozhe Hu and Tom Benson (Tufts) | “MHD Formulations.”
Nov 06 | James, Xiaozhe, and Tom (Tufts) | “Solvers for Maxwell’s Equations and MHD.”
Nov 13 | Scott MacLachlan (Memorial University) | “First-Order System Petrov-Galerkin for Singularly Perturbed Problems.”
Nov 20 | Bruce Boghosian (Tufts) | “More on Lattice Boltzman for Fluids.”
Dec 04 | Dong Han (Tufts) | “Intro to Magnetoelasticity”