Results 21 to 30 of about 28,693 (307)

High-resolution digital holography utilized by the subpixel sampling method [PDF]

, 2011
A novel (to our knowledge) approach for resolution improvement in digital holography is presented in this paper. The proposed method is based on recording the incoming interference field on a complementary metal-oxide semiconductor (CMOS) camera with ...
Fritzsche, Marco, Bryanston-Cross, P., Timmerman, B. H. (Brenda H.), Peter Bryanston-Cross, Claus, Daniel, Daniel Claus, Daciana Iliescu, Brenda Timmerman, Iliescu, Daciana, Marco Fritzsche   +9 more
core   +1 more source

ASYNCHRONOUS MOTOR DRIVE INTERHARMONICS CALCULATION BASED ON GENERALIZED FOURIER SERIES OF SEVERAL VARIABLES

Технічна електродинаміка, 2020
In the paper impact of low-frequency interharmonics on AC devices, in particular asynchronous motors is described. It is shown that because of the indefinite time interval of measurement, interharmonics detection and calculation is complicated.
Є.В. Вербицький, В.Я. Жуйков   +1 more
doaj   +1 more source

A Fourier Continuation Method for the Solution of Elliptic Eigenvalue Problems in General Domains [PDF]

Mathematical Problems in Engineering, 2015
We present a new computational method for the solution of elliptic eigenvalue problems with variable coefficients in general two-dimensional domains. The proposed approach is based on use of the novel Fourier continuation method (which enables fast and highly accurate Fourier approximation of nonperiodic functions in equispaced grids without the ...
Bruno, Oscar P., Elling, Timothy, Sen, Ayon   +2 more
openaire   +3 more sources

Analysis of the Stress State of a Layer with Two Cylindrical Elastic Inclusions and Mixed Boundary Conditions

Journal of Mechanical Engineering, 2022
The spatial problem of the elasticity theory is studied for a layer with two infinite circular solid cylindrical inclusions that are parallel to each other and to the layer boundaries.
Vitalii Yu. Miroshnikov, Oleksandr B. Savin, Mykhailo M. Hrebennikov, Oleksandr A. Pohrebniak   +3 more
doaj   +1 more source

On the approximation of conjugate of functions belonging to the generalized Lipschitz class by Euler-matrix product summability method of conjugate series of Fourier series

Ratio Mathematica, 2022
In this paper, a new theorem on the approximation of conjugate of functions belonging to the generalized Lipschitz class $Lip\left(\xi(t),p \right) $ by Euler-Matrix product summability method of conjugate series of Fourier series has been obtained.
Jitendra Kumar Kushwaha, krishna Kumar
doaj   +1 more source

A construction guide to analytically generated meshes for the Fourier Modal Method

Optics Express, 2012
The concepts of adaptive coordinates and adaptive spatial resolution significantly enhance the performance of Fourier Modal Method for the simulation of periodic photonic structures, especially metallo-dielectric systems. We present several approaches for constructing different types of analytical coordinate transformations that are applicable to a ...
Küchenmeister, Jens, Zebrowski, Thomas, Busch, Kurt   +2 more
openaire   +4 more sources

An Analysis of the Stress–Strain State of a Layer on Two Cylindrical Bearings

Computation
A spatial problem of elasticity theory is solved for a layer located on two bearings embedded in it. The bearings are represented as thick-walled pipes embedded in the layer parallel to its boundaries.
Vitaly Miroshnikov, Oleksandr Denshchykov, Iaroslav Grebeniuk, Oleksandr Savin   +3 more
doaj   +1 more source

Modified Fourier expansions: theory, construction and applications

, 2010
Modified Fourier expansions present an alternative to more standard algorithms for the approximation of nonperiodic functions in bounded domains. This thesis addresses the theory of such expansions, their effective construction and computation, and ...

core   +1 more source

Consideration of Spatially Infinite Loads in the Problem for a Layer with a Cylindrical Cavity and Continuous Supports

Computation
An analytical method is proposed for determining the stress-strain state in an elastic layer with a cylindrical cavity supported by linear continuous supports perpendicular to the cavity.
Nataliia Ukrayinets, Tetyana Alyoshechkina, Vitaly Miroshnikov, Oleksandr Savin, Basheer Younis, Vitalii Vynohradov, Olena Murahovska   +6 more
doaj   +1 more source

Fractional transformations of generalised functions

, 2009
A distributional theory of fractional transformations is developed. A constructive approach, based on the eigenfunction expansion method pioneered by A. H.
Lamb, Wilson, Khan, Khaula Naeem, McBride, A.C., Khan, K.N., Lamb, W., McBride, Adam C.   +5 more
core   +1 more source