Now showing items 26-37 of 37

• #### A Posteriori Error Estimation for DEIM Reduced Nonlinear Dynamical Systems ﻿

(2014)
In this work an efficient approach for a posteriori error estimation for POD-DEIM reduced nonlinear dynamical systems is introduced. The considered nonlinear systems may also include time- and parameter-affine linear terms ...
• #### Predicting solvation free energies and thermodynamics in polar solvents and mixtures using a solvation-layer interface condition ﻿

(2017)
We demonstrate that with two small modifications, the popular dielectric continuum model is capable of predicting, with high accuracy, ion solvation thermodynamics (Gibbs free energies, entropies, and heat capacities) in ...
• #### Reconstruction of Lamé Moduli and Density at the Boundary Enabling Directional Elastic Wavefield Decomposition ﻿

(2017)
We consider the inverse boundary value problem for the system of equations describing elastic waves in isotropic media on a bounded domain in $\mathbb{R}^3$ via a finite-time Laplace transform. The data are the dynamical ...
• #### Residual-Based Adaptivity and PWDG Methods for the Helmholtz Equation ﻿

(2015)
We present a study of two residual a posteriori error indicators for the plane wave discontinuous Galerkin (PWDG) method for the Helmholtz equation. In particular, we study the $h$-version of PWDG in which the number of ...
• #### Ritz Value for Non-Hermitian Matrices ﻿

(2012)
Rayleigh-Ritz eigenvalue estimates for Hermitian matrices obey Cauchy interlacing, which has helpful implications for theory, applications, and algorithms. In contrast, few results about the Ritz values of non-Hermitian ...
• #### Scattering and dip angle decomposition based on subsurface offset extended wave-equation migration ﻿

(2016)
An angle-dependent reflection coefficient is recovered by seismic migration in the angle domain. We have developed a postmigration technique for computing scattering and dip angle common-image gathers (CIGs) from seismic ...
• #### Short-term Recurrence Krylov Subspace Methods for Nearly Hermitian Matrices ﻿

(2012)
The progressive GMRES algorithm, introduced by Beckermann and Reichel in 2008, is a residual-minimizing short-recurrence Krylov subspace method for solving a linear system in which the coefficient matrix has a low-rank ...
• #### Synthetic Aperture Radar Imaging and Motion Estimation via Robust Principal Component Analysis ﻿

(2012-08-22)
We consider the problem of synthetic aperture radar (SAR) imaging and motion estimation of complex scenes. By complex we mean scenes with multiple targets, stationary and in motion. We use the usual setup with one moving ...
• #### Time-Dependent Coupling of Navier-Stokes and Darcy Flows ﻿

(2013)
A weak solution of the coupling of time-dependent incompressible NavierﾖStokes equations with Darcy equations is defined. The interface conditions include the BeaversﾖJosephﾖSaffman condition. Existence and uniqueness of ...
• #### A Topological Model of the Hippocampal Cell Assembly Network ﻿

(2016)
It is widely accepted that the hippocampal place cells' spiking activity produces a cognitive map of space. However, many details of this representation's physiological mechanism remain unknown. For example, it is believed ...
• #### Topological Schemas of Cognitive Maps and Spatial Learning ﻿

(2016)
Spatial navigation in mammals is based on building a mental representation of their environment-a cognitive map. However, both the nature of this cognitive map and its underpinning in neural structures and activity remains ...
• #### A Trust-Region Algorithm with Adaptive Stochastic Collocation for PDE Optimization under Uncertainty ﻿

(2013)
The numerical solution of optimization problems governed by partial differential equations (PDEs) with random coefficients is computationally challenging because of the large number of deterministic PDE solves required at ...