Results 21 to 30 of about 479,061 (253)

A Galerkin/POD Reduced-Order Model from Eigenfunctions of Non-Converged Time Evolution Solutions in a Convection Problem

open access: yesMathematics, 2022
A Galerkin/POD reduced-order model from eigenfunctions of non-converged time evolution transitory states in a problem of Rayleigh–Bénard is presented. The problem is modeled in a rectangular box with the incompressible momentum equations coupled with an ...
Jesús Cortés   +2 more
doaj   +1 more source

Newton-Krylov generalized minimal residual algorithm in solving nonlinear Volterra-Fredholm-Hammerstein integral equations [PDF]

open access: yesMathematics and Computational Sciences, 2021
In this paper, Galerkin and collocation methods based on shifted Legendre polynomials and spectral methods have been applied on nonlinear Volterra-Fredholm-Hammerstein (VFH) integral equations, these methods transfer the finding solution of a nonlinear ...
Ahmad Zavvartorbati
doaj   +1 more source

A Hybrid Orthogonal Polynomial Approach for Optimal Control of Fractional Parabolic PDEs: Combining Legendre, Chebyshev, and Jacobi Polynomials [PDF]

open access: yesControl and Optimization in Applied Mathematics
This paper presents a novel hybrid orthogonal polynomial method for solving optimal control problems governed by fractional parabolic PDEs. By strategically weighting and combining these polynomial bases, the method adaptively leverages their respective ...
Muhammed Hassanein Al-Hakeem   +2 more
doaj   +1 more source

Spectral methods for matrices and tensors [PDF]

open access: yesProceedings of the forty-second ACM symposium on Theory of computing, 2010
While Spectral Methods have long been used for Principal Component Analysis, this survey focusses on work over the last 15 years with three salient features: (i) Spectral methods are useful not only for numerical problems, but also discrete optimization problems (Constraint Optimization Problems - CSP's) like the max.
openaire   +2 more sources

Well-posedness and stability analysis of hybrid feedback systems using Shkalikov's theory [PDF]

open access: yesOpuscula Mathematica, 2006
The modern method of analysis of the distributed parameter systems relies on the transformation of the dynamical model to an abstract differential equation on an appropriately chosen Banach or, if possible, Hilbert space.
Piotr Grabowski
doaj  

APPLICATION OF SPECTRAL AND DISPERSION TECHNIQUES AT THE DECAMETER WAVELENGTHS FOR DETERMINATION OF SOLAR WIND PARAMETERS

open access: yesRadio Physics and Radio Astronomy, 2014
Some features of application of spectral and dispersion techniques for determination of solar wind parameters from the interplanetary scintillations data of cosmic radio sources at the decameter wavelengths are described.
M. R. Olyak   +3 more
doaj   +1 more source

Fatigue Overview of Ship Structures under Induced Wave Loads

open access: yesJournal of Marine Science and Engineering
Fatigue damage represents a key failure mode in ship structures. Such damage typically begins at vulnerable points in the structure, like welded joints, stress concentration areas, and cracks. Cyclic loading, particularly from waves, encountered by ships
Pasqualino Corigliano   +5 more
doaj   +1 more source

Genomic Diversity and Clinical Variability in Pediatric Primary Cutaneous Anaplastic Large Cell Lymphoma: A Case Series

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Primary cutaneous anaplastic large cell lymphoma (pcALCL) is a rare pediatric CD30‐positive T‐cell lymphoproliferative disorder with an excellent prognosis, but its genomic drivers are poorly defined. We report three children with skin‐limited disease demonstrating striking molecular heterogeneity, including NPM::ALK, NUP214::FRK, and a novel ...
Shoshana Greenberger   +7 more
wiley   +1 more source

A Fast Galerkin Approach for Solving the Fractional Rayleigh–Stokes Problem via Sixth-Kind Chebyshev Polynomials

open access: yesMathematics, 2022
Herein, a spectral Galerkin method for solving the fractional Rayleigh–Stokes problem involving a nonlinear source term is analyzed. Two kinds of basis functions that are related to the shifted sixth-kind Chebyshev polynomials are selected and utilized ...
Ahmed Gamal Atta   +3 more
doaj   +1 more source

Spectral Methods in PDE

open access: yesMilan Journal of Mathematics, 2010
This is to review some recent progress in PDE. The emphasis is on (energy) supercritical nonlinear Schrödinger equations. The methods are applicable to other nonlinear equations.
openaire   +2 more sources

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