Results 31 to 40 of about 422,047 (168)

LOCAL INTERPOLATION AND APPROXIMATION IN TASKS OF HEURISTIC SYNTHESIS OF DIGITAL FILTER

Российский технологический журнал, 2018
The article has an overview character with elements of generalization, but at the same time it includes information brought to the level of immediate practical implementation.
V. N. Isakov, P. I. Timoshenko
doaj   +1 more source

Applications of Fractional Differentiation Matrices in Solving Caputo Fractional Differential Equations

Fractal and Fractional, 2023
This paper pursues obtaining Jacobi spectral collocation methods to solve Caputo fractional differential equations numerically. We used the shifted Jacobi–Gauss–Lobatto or Jacobi–Gauss–Radau quadrature nodes as the collocation points and derived the ...
Zhongshu Wu, Xinxia Zhang, Jihan Wang, Xiaoyan Zeng   +3 more
doaj   +1 more source

Viscoelastic modulus reconstruction using time harmonic vibrations [PDF]

, 2014
This paper presents a new iterative reconstruction method to provide high-resolution images of shear modulus and viscosity via the internal measurement of displacement fields in tissues.
Ammari, Habib, Seo, Jin Keun, Zhou, Liangdong   +2 more
core   +4 more sources

Moments of spectral functions: Monte Carlo evaluation and verification

, 2005
The subject of the present study is the Monte Carlo path-integral evaluation of the moments of spectral functions. Such moments can be computed by formal differentiation of certain estimating functionals that are infinitely-differentiable against time ...
B. Simon, Cristian Predescu, E. Sim, E. Tadmor, J. D. Doll, N. I. Akhiezer, R. P. Feynman, W. H. Press, W. M. Gentleman   +8 more
core   +1 more source

Computing with functions in spherical and polar geometries I. The sphere [PDF]

, 2016
A collection of algorithms is described for numerically computing with smooth functions defined on the unit sphere. Functions are approximated to essentially machine precision by using a structure-preserving iterative variant of Gaussian elimination ...
Townsend, Alex, Wilber, Heather, Wright, Grady B.   +2 more
core   +3 more sources

Fractional spectral differentiation matrices based on Legendre approximation

Advances in Difference Equations, 2020
A simple scheme is proposed for computing N × N $N \times N$ spectral differentiation matrices of fractional order α for the case of Legendre approximation.
Asghar Ghorbani, Dumitru Baleanu
doaj   +1 more source

Optimization via Chebyshev Polynomials

, 2017
This paper presents for the first time a robust exact line-search method based on a full pseudospectral (PS) numerical scheme employing orthogonal polynomials.
Elgindy, Kareem T.
core   +1 more source

Model of Functional Dendritic Cell Algorithm Based on Numerical Differentiation [PDF]

Jisuanji gongcheng, 2020
The Dendritic Cell Algorithm(DCA) is an algorithm for simulating antigen presentation in the human immune system,which can divide input data into normal and abnormal data quickly and effectively.However,the existing DCA models are generally lack of clear
ZHANG Yi, ZHOU Wen, LIANG Yiwen, TAN Chengyu
doaj   +1 more source

Standard and Corrected Numerical Differentiation Formulae

Communications in Advanced Mathematical Sciences, 2019
Standard numerical differentiation rules that might be established by the method of undetermined coefficients are revisited. Best truncation error bounds are established by a direct method and by the method of integration by parts "backwards".
François Dubeau
doaj   +1 more source

Numerical differentiation of fractional order derivatives based on inverse source problems of hyperbolic equations

Mathematical Modelling and Analysis
In this paper, we mainly study the numerical differentiation problem of computing the fractional order derivatives from noise data of a single variable function.
Zewen Wang, Shufang Qiu, Xiuxing Rui, Wen Zhang   +3 more
doaj   +1 more source