Results 11 to 20 of about 29,809 (206)

A Comparative Study on Signal Decomposition Techniques for Stimulated Raman Photoacoustic Microscopy. [PDF]

J Biophotonics
Comparison of sO2 maps generated using signal decomposition methods.ABSTRACTIn this paper, we present a comparative study of signal decomposition techniques in multispectral photoacoustic microscopy (MS‐PAM) systems that are based on the use of stimulated Raman spectroscopy (SRS).
Khansari A, Khodavirdi H, Ranjbaran SM, Zafar M, Beirami MJ, Avanaki K.   +5 more
europepmc   +2 more sources

Measuring the effectiveness of extrapolation techniques associated with the multigrid method applied to the Navier-Stokes equations

Acta Scientiarum: Technology, 2022
In this work, we applied different extrapolation techniques in association with the multigrid method to discover which one is the most effective in reducing the iteration error and the processing time (CPU time), as well as in improving the convergence ...
Bruno Benato Rutyna, Marcio Augusto Villela Pinto, Reverton Luis Antunes Neundorf, Marcio Alexandro Maciel Anunciação, Marcio André Martins   +4 more
doaj   +1 more source

HP-multigrid as smoother algorithm for higher order discontinuous Galerkin discretizations of advection dominated flows. Part I. Multilevel Analysis [PDF]

, 2011
The hp-Multigrid as Smoother algorithm (hp-MGS) for the solution of higher order accurate space-(time) discontinuous Galerkin discretizations of advection dominated flows is presented. This algorithm combines p-multigrid with h-multigrid at all p-levels,
Rhebergen, S., Vegt, J.J.W. van der
core   +15 more sources

Multigrid methods for an elliptic optimal control problem with pointwise state constraints

Results in Applied Mathematics, 2023
We design multigrid methods for an elliptic distributed optimal control problem with pointwise state constraints. They are based on the P1 finite element method from Brenner et al.
Susanne C. Brenner, Sijing Liu, Li-yeng Sung   +2 more
doaj   +1 more source

A Geometric Multigrid Method for 3D Magnetotelluric Forward Modeling Using Finite-Element Method

Remote Sensing, 2023
The traditional three-dimensional (3D) magnetotelluric (MT) forward modeling using Krylov subspace algorithms has the problem of low modeling efficiency.
Xianyang Huang, Changchun Yin, Luyuan Wang, Yunhe Liu, Bo Zhang, Xiuyan Ren, Yang Su, Jun Li, Hui Chen   +8 more
doaj   +1 more source

A Nonlinear Multigrid Method for the Parameter Identification Problem of Partial Differential Equations with Constraints

Mathematics, 2022
In this paper, we consider the parameter identification problem of partial differential equations with constraints. A nonlinear multigrid method is introduced to the process of parameter inversion.
Tao Liu, Jiayuan Yu, Yuanjin Zheng, Chao Liu, Yanxiong Yang, Yunfei Qi   +5 more
doaj   +1 more source

Multigrid optimization for space-time discontinuous Galerkin discretizations of advection dominated flows [PDF]

, 2010
The goal of this research is to optimize multigrid methods for higher order accurate space-time discontinuous Galerkin discretizations. The main analysis tool is discrete Fourier analysis of two- and three-level multigrid algorithms.
A. Brandt, C.M. Klaij, C.M. Klaij, I. Yavneh, J.J. Sudirham, J.J.W. Vegt van der, P. Wesseling, U. Trottenberg   +7 more
core   +4 more sources

An extrapolation full multigrid algorithm combined with fourth-order compact scheme for convection–diffusion equations

Advances in Difference Equations, 2018
In this paper, we propose an extrapolation full multigrid (EXFMG) algorithm to solve the large linear system arising from a fourth-order compact difference discretization of two-dimensional (2D) convection diffusion equations.
Ming Li, Zhoushun Zheng, Kejia Pan
doaj   +1 more source

A Full Multigrid Method for Linear Complementarity Problems arising from Elastic Normal Contact Problems

Mathematical Modelling and Analysis, 2014
This paper presents a full multigrid (FMG) technique, which combines a multigrid method, an active set algorithm and a nested iteration technique, to solve a linear complementarity problem (LCP) modeling elastic normal contact problems.
Jing Zhao, Edwin A.H. Vollebregt, Cornelis W. Oosterlee   +2 more
doaj   +1 more source

A note on multigrid preconditioning for fractional PDE-constrained optimization problems

Results in Applied Mathematics, 2021
In this note we present a multigrid preconditioning method for solving quadratic optimization problems constrained by a fractional diffusion equation.
Harbir Antil, Andrei Drăgănescu, Kiefer Green   +2 more
doaj   +1 more source