Results 81 to 90 of about 1,731 (272)

How to optimize preconditioners for the conjugate gradient method: a\n stochastic approach [PDF]

, 2018
Alexandr Katrutsa, Mike A. Botchev, George Ovchinnikov, Ivan Oseledets   +3 more
openalex   +2 more sources

A preconditioned Conjugate Gradient Method on a distributed memory multiprocessor

Applied Mathematics Letters, 1995
Theoretical paper. Definition, theory and discussion of the implementation of a polynomial preconditioner for SPD matrix. No numerical example, no discussion of communication, no discussion for sparse matrix.
Bru, R., Corral, C., Mas, J.
openaire   +2 more sources

Coupled Clustering in Hierarchical Matrices for the Oseen Problem

International Journal for Numerical Methods in Fluids, EarlyView.
Fluid flow problems can be modelled by the Navier‐Stokes or, after linearization, by the Oseen equations. Their discretization results in linear systems in saddle point form which are typically very large and need to be solved iteratively. We propose a novel block structure for hierarchical matrices which is then used to build preconditioners for the ...
Jonas Grams, Sabine Le Borne
wiley   +1 more source

Domain decomposition PCG methods for serial and parallel processing

Computer Assisted Methods in Engineering and Science, 2023
In this paper two domain decomposition formulations are presented in conjunction with the preconditioned conjugate gradient method (PCG) for the solution of large-scale problems in solid and structural mechanics.
M. Papadrakakis, S. Bitzarakis
doaj  

Corticosterone and Mitochondrial Efficiency Are Associated With Changes in DNA Oxidative Damage During an Acute Stress Response in Leach's Storm‐Petrels (Hydrobates leucorhous)

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, EarlyView.
ABSTRACT The ability of organisms to effectively respond to challenges is critical for survival. We investigated how an acute stressor affected corticosterone, mitochondrial function, and DNA oxidative damage in a wild population of Leach's storm‐petrels (Hydrobates leucorhous).
Kayla E. Lichtner, Jack K. Dziubek, Nicole A. Joseph, Sarah E. Chapman, Tori J. Chace, Dongxiao Sun, Zachary T. Bitzer, Antoine Stier, Robert A. Mauck, Patricia L. Jones, Mark F. Haussmann   +10 more
wiley   +1 more source

Circadian Immunity and Vascular Inflammation in Cardiovascular Disease Chronotherapy Windows: Time for a Re‐Assessment

Med Research, EarlyView.
ABSTRACT Circadian rhythms orchestrate cardiovascular physiology by regulating immune and inflammatory pathways. Disruption of these rhythms profoundly alters vascular homeostasis, thereby promoting the onset and progression of cardiovascular diseases (CVD).
Tian Zhang, Ge Zhang, Tian‐Ding Liu, Tianshu Gu, Fengyi Yu, Pengyuan Xu, Wunan Mi, Xuanjiang Zhao, Qian Guo, Honglin Zheng, Taiqi Zhao, Qiang Li, Di Lu, Mingxuan Duan, Chaoyang Yu, Ruhao Wu, Shiqian Zhang, Haonan Zhang, Zeyu Wang, Youyang Zheng, Yan Xiao, Zenglei Zhang, Ge Zhang   +22 more
wiley   +1 more source

On the Convergence of Conjugate Gradient and GMRES Algorithms in the Forward Backward Sweep Method for Optimal Control

Optimal Control Applications and Methods, EarlyView.
Optimal control combines state and adjoint equations, which yield the state (x$$ x $$) and adjoint (lambda) variables as a function of the control variables (u$$ u $$). This structure allows us to design strategies for iteratively updating the control variable, based on conjugate gradient (CG) or GMRES algorithms.
N. Armengou‐Riera, N. Rabiei, A. Bijalwan, A. Rodríguez‐Ferran, J. J. Muñoz   +4 more
wiley   +1 more source

A parameterized Schur complement preconditioner for linear system arising from additive HQ image restoration

Results in Applied Mathematics
Image restoration is to estimate the clean image from the recorded image, it is a highly ill-posed inverse problem. Regularization method is an important approach for solving such problem, which can usually be achieved by minimizing a cost function ...
Peipei Zhao, Pengyu Zhang
doaj   +1 more source

Numerical and Experimental Investigation of Temperature Distribution for Oil-Immersed Transformer Winding Based on Dimensionless Least-Squares and Upwind Finite Element Method

IEEE Access, 2019
To accurately analyze the temperature rising and locate the hot-spot of oil-immersed transformer windings, a hybrid method based on the dimensionless least-squares finite element method (DLSFEM) and upwind finite element method (UFEM) is proposed in this
Gang Liu, Zhi Zheng, Xun Ma, Shichang Rong, Weige Wu, Lin Li   +5 more
doaj   +1 more source

Preconditioned nonlinear conjugate gradient method for micromagnetic energy minimization [PDF]

, 2018
Lukas Exl, Johann Fischbacher, Alexander Kovacs, Harald Oezelt, Markus Gusenbauer, T. Schrefl   +5 more
openalex   +1 more source