Now showing items 241-250 of 265
Inversion of Reflection Seismograms by Differential Semblance Analysis: Algorithm Structure and Synthetic Examples
Seismograms predicted from acoustic or elastic earth models depend very nonlinearly on the long wavelength components of velocity. This sensitive dependence demands the use of special variational principles in waveform-based ...
The Existence of Weak Solutions to Single Porosity and Simple Dual-Porosity Models of Two-Phase Incompressible Flow
It is shown that there exists a weak solution to a degenerate and singular elliptic-parabolic partial integro-differential system of equations. These equations model two-phase incompressible flow of immiscible fluids in ...
Analysis of Explicit/Implicit, Block Centered Finite Difference Domain Decomposition Procedures for Parabolic Problems
Domain decomposition procedures for solving parabolic equations are considered. The underlying discretization is block-centered finite differences. In this procedures, fluxes at subdomain interfaces are calculated from the ...
An Implementation of a Parallel Primal-Dual Interior Point Method for Multicommodity Flow Problems
An implementation of the primal-dual predictor-corrector interior point method is specialized to solve linear multicommodity flow problems. The block structure of the constraint matrix is exploited via parallel computation. ...
Column-Secant Update Technique for Solving Systems of Nonlinear Equations
This paper presents a QR update implementation of the successive column correction (SCC) method and a column-secant modification of the SCC method, which is called the CSSCC method. The computational cost of the QR update ...
A Diagonal-Secant Update Technique for Sparse Unconstrained Optimization
This paper presents a diagonal-secant modification of the successive element correction method, a finite-difference based method, for sparse unconstrained optimization. This new method uses the gradient values more efficiently ...
Conventions for Using PIERS