Results 1 to 10 of about 13,856,756 (258)

Development of certified reference materials for physicochemical analysis. Certified reference solutions for the composition of aqueous aluminum, indium, magnesium, nickel and titanium

Стандартные образцы, 2019
This paper presents information on the development and certification of reference materials (CRM) for the composition of aqueous aluminium, indium, magnesium, nickel, and titanium solutions.CRMs are represented by aqueous solutions containing aluminium ...
I. I. Ermakova, A. V. Ivanov, I. N. Zyablikova, A. N. Shobina   +3 more
doaj   +1 more source

Influence of Computed Wave Spectra on Statistical Wave Properties

Journal of Marine Science and Engineering, 2020
The main goal of the paper is to compare the effects of the wave spectrum, computed using the Discrete Interaction Approximation (DIA) and the Webb–Resio–Tracy (WRT) methods, on statistical wave properties such as skewness and kurtosis in the context of ...
Tatjana Kokina, Frederic Dias
doaj   +1 more source

A Refined Spectral Galerkin Approach Leveraging Romanovski–Jacobi Polynomials for Differential Equations

Mathematics
This study explores the application of Romanovski–Jacobi polynomials (RJPs) in spectral Galerkin methods (SGMs) for solving differential equations (DEs).
Ramy M. Hafez, Mohamed A. Abdelkawy, Hany M. Ahmed   +2 more
doaj   +1 more source

The motion planning problem and exponential stabilization of a heavy chain. Part II [PDF]

Opuscula Mathematica, 2008
This is the second part of paper [P. Grabowski, The motion planning problem and exponential stabilization of a heavy chain. Part I, to appear in International Journal of Control], where a model of a heavy chain system with a punctual load (tip mass) in ...
Piotr Grabowski
doaj  

On Fourier Series in the Context of Jacobi Matrices

Axioms
We investigate the properties of matrices that emerge from the application of Fourier series to Jacobi matrices. Specifically, we focus on functions defined by the coefficients of a Fourier series expressed in orthogonal polynomials.
José M. A. Matos, Paulo B. Vasconcelos, José A. O. Matos   +2 more
doaj   +1 more source

Explicit collocation algorithm for the nonlinear fractional Duffing equation via third-kind Chebyshev polynomials [PDF]

Iranian Journal of Numerical Analysis and Optimization
Herein, we propose an accurate algorithm to approximate the solution of the nonlinear fractional-order Duffing equation (NFDE). The algorithm is based on using shifted Chebyshev polynomials of the third-kind as basis functions and the spectral ...
Y.H. Youssri, A.G. Atta, M.O. Moustafa, Z.Y. Abu Waar   +3 more
doaj   +1 more source

Machine-learning-based spectral methods for partial differential equations. [PDF]

Sci Rep, 2023
Meuris B, Qadeer S, Stinis P.
europepmc   +1 more source

Two Chebyshev Spectral Methods for Solving Normal Modes in Atmospheric Acoustics. [PDF]

Entropy (Basel), 2021
Wang Y, Tu H, Liu W, Xiao W, Lan Q.
europepmc   +1 more source

Accurate Chebyshev collocation solutions for the biharmonic eigenproblem on a rectangle

Journal of Numerical Analysis and Approximation Theory, 2017
We are concerned with accurate Chebyshev collocation (ChC) solutions to fourth order eigenvalue problems. We consider the 1D case as well as the 2D case.
Imre Boros
doaj   +2 more sources

Spectral Methods for Response Enhancement of Microwave Resonant Sensors in Continuous Non-Invasive Blood Glucose Monitoring. [PDF]

Bioengineering (Basel), 2022
Buonanno G, Brancaccio A, Costanzo S, Solimene R.   +3 more
europepmc   +1 more source