Results 71 to 80 of about 53,939 (225)

Best Approximation and Moduli of Smoothness [PDF]

, 2012
2010 Mathematics Subject Classification: 41A25, 41A10.The aim of this note is to present moduli of smoothness which are introduced by different schools of approximation for characterization of the best algebraic approximation.
Dimova Zapryanova, Teodora
core  

Predefined‐Time Dynamic Surface Control of Tank Horizontal Stabilization System With Disturbance

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Modern new tanks are difficult to achieve high precision control of the horizontal stabilization system due to electromechanical coupling and road surface disturbance during high‐speed combat. A predefined‐time dynamic surface controller (DSCPT) is proposed for the fast stabilization and strong disturbance problems of the tank horizontal ...
Zhicheng Fan, Shusen Yuan, Wenxiang Deng, Haoqi Wen, Haochuan Sun, Jianyong Yao   +5 more
wiley   +1 more source

Rational approximation to trigonometric operators

BIT Numerical Mathematics, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Grimm, V., Hochbruck, Marlis
openaire   +5 more sources

An Improved Mesh Stiffness Model for a Gear Tooth With Double Cracks on Both Sides Considering Opened and Closed States

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Research on the failure mechanisms of gears with multiple cracks has gained widespread attention. Among these, the study of the mesh stiffness characteristics of gears with multiple cracks is crucial for optimizing gear design and improving transmission reliability.
Luyan Xu, Xin Yu, Yunyun Sun
wiley   +1 more source

On the properties for families of function classes over harmonic intervals and their embedding relation with Besov spaces

Қарағанды университетінің хабаршысы. Математика сериясы
The article is dedicated to the issues of studying the approximation of functions by trigonometric polynomials with a spectrum from special sets. In this paper, these special sets are harmonic intervals.
G.A. Yessenbayeva, L.A. Serikova
doaj   +1 more source

Approximation of Signals (Functions) by Trigonometric Polynomials in Lp-Norm

International Journal of Mathematics and Mathematical Sciences, 2014
Mittal and Rhoades (1999, 2000) and Mittal et al. (2011) have initiated a study of error estimates En(f) through trigonometric-Fourier approximation (tfa) for the situations in which the summability matrix T does not have monotone rows.
M. L. Mittal, Mradul Veer Singh
doaj   +1 more source

APPROXIMATION PROPERTIES OF SOME DISCRETE FOURIER SUMS FOR PIECEWISE SMOOTH DISCONTINUOUS FUNCTIONS

Проблемы анализа, 2019
Denote by Ln, N (f, x) a trigonometric polynomial of order at most n possessing the least quadratic deviation from f with respect to the system  tk = u + 2πk N N−1 k=0 , where u ∈ R and n 6 N/2.
G. G. Akniyev
doaj   +1 more source

Nikol’skii–Type Inequalities for Trigonometric Polynomials for Lorentz–Zygmund Spaces

Journal of Function Spaces, 2020
Nikol’skii–type inequalities, that is inequalities between different metrics of trigonometric polynomials on the torus Td for the Lorentz–Zygmund spaces, are obtained. The results of previous paper “Nikol’skii inequalities for Lorentz–Zygmund spaces” are
Leo R. Ya. Doktorski
doaj   +1 more source

The Hypotheses on Expansion of Iterated Stratonovich Stochastic Integrals of Arbitrary Multiplicity and Their Partial Proof

, 2020
In this review article we collected more than ten theorems on expansions of iterated Ito and Stratonovich stochastic integrals, which have been formulated and proved by the author.
Kuznetsov, Dmitriy F.
core  

Bending Analysis of Thickness‐ and Shear‐Deformable Materially Imperfect Composite Shells With von Kármán‐Type Geometric Nonlinearities

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Geometrically nonlinear static analysis of materially imperfect composite doubly curved shells is investigated via the generalised differential quadrature method. The effects of both shear and thickness deformation are considered through a thickness‐ and shear‐deformable third‐order theory formulated in curvilinear coordinates, while the ...
Behrouz Karami, Mergen H. Ghayesh, Shahid Hussain, Marco Amabili   +3 more
wiley   +1 more source