Results 81 to 90 of about 123 (116)

Adaptive Time Discretization for Retarded Potentials

open access: yes, 2014
In this paper, we will present advanced discretization methods for solving retarded potential integral equations. We employ a C∞-partition of unity method in time and a conventional boundary element method for the spatial discretization.
S. Sauter, A. Veit
core  

Uniform Asymptotic Expansion Of The Square-Root Helmholtz Operator And The One-Way Wave Propagator

open access: yes, 2003
The Bremmer coupling series solution ofthe wave equation, in generally inhomogeneous media, requires the introduction ofpseudodi#erential operators. Such operators appear in the diagonalization process ofthe acoustic system's matrix ofpartial di ...
A. K. Gautesen, Maarten V. De Hoop
core  

On the Limiting Absorption and Amplitude Principles for Transmission Problems With Unbounded Interfaces

open access: yes, 1995
We consider the transmission problem for second-order differential equations with unbounded interfaces. The spaces B and B are used to prove the limiting absorption principle for the steady-state problem and to establish the resolvent estimate at low ...
Bo Zhang
core  

Radiation Condition and Limiting Amplitude Principle for Acoustic Propagators with Two Unbounded Media

open access: yes, 1996
Consider the diffraction problem for perturbed acoustic propagators with perturbations decreasing slowly at infinity. The propagation speed is discontinuous at the interface of two unbounded media, and the interface may be an arbitrary and smooth surface
Bo Zhang
core  

Self-averaging from lateral diversity in the ItôSchrödinger equation

open access: yes, 2006
. We consider the random Schrödinger equation as it arises in the paraxial regime for wave propagation in random media. In the white noise limit it becomes the Itô-Schrödinger stochastic partial differential equation (SPDE) which we analyze here in the ...
George Papanicolaou   +2 more
core  

The role of numerical boundary procedures in the stability of perfectly matched layers

open access: yes, 2014
. In this paper we address the temporal energy growth associated with numerical approximations of the perfectly matched layer (PML) for Maxwell’s equations in first order form.
Kenneth Duru
core  

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