Results 31 to 40 of about 204,577 (297)

The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer

open access: yesEnergies, 2021
This paper presents the method for evaluation of the turns ratio correction of the inductive current transformer using the magnetization curves determined at the non-load state and in the load conditions.
Ernest Stano
doaj   +1 more source

Method for reducing the amplitudes of higher harmonics in the output voltage of the frequency converter

open access: yesВестник Самарского государственного технического университета. Серия: Технические науки, 2021
Modern low-voltage frequency converters, built on the principle of stand-alone inverters with pulse-width modulation, have large amplitudes of higher harmonics in the output voltage.
Alexsandr V. Starikov   +3 more
doaj   +1 more source

Method of calculating the distortion coefficient sinusoidality of the voltage curve created by three-phase straight lines

open access: yesВестник Самарского государственного технического университета. Серия: Технические науки, 2021
The existing calculation methods in various sources represent rectifier installations as sources of higher harmonics. In this case, the current value of the primary winding of the transformer in the form of rectangles is decomposed into a Fourier series ...
Vyacheslav S. Osipov
doaj   +1 more source

Exact cascading nonlinearity in quasi-phase-matched quadratic media [PDF]

open access: yes, 2014
The evolution of light pulses and beams in a quasi-phase-matched (QPM) quadratic medium is usually described by considering only the spatial harmonic of the QPM grating that minimizes the residual phase-mismatch.
Conforti, Matteo
core   +1 more source

Fourier Transform (FT) Analysis of the Stress as a Tool to Follow the Fatigue Behavior of Metals

open access: yesApplied Sciences, 2021
This work investigates the possibility of applying Fourier Transform (FT) analysis of the force signal to follow fatigue behavior of metals under oscillatory displacement-controlled tests in uniaxial tension/tension.
Valerian Hirschberg, Denis Rodrigue
doaj   +1 more source

HARMONIC GRADIENTS ON HIGHER-DIMENSIONAL SIERPIŃSKI GASKETS [PDF]

open access: yesFractals, 2020
We consider criteria for the differentiability of functions with continuous Laplacian on the Sierpiński Gasket and its higher-dimensional variants [Formula: see text], [Formula: see text], proving results that generalize those of Teplyaev [Gradients on fractals, J. Funct. Anal. 174(1) (2000) 128–154].
LUKE BROWN   +4 more
openaire   +3 more sources

Mechanisms for the production of harmonics in free electron lasers [PDF]

open access: yes, 1991
Harmonics in the radiation of a free electron laser are useful for extending the range of tuning, may originate in spontaneous or parametric processes, and can take part in stimulated emission or amplification.
Elgin, J.N., Penman, C.
core   +2 more sources

Finding, and Not Finding, “Higher Harmonic Flows” [PDF]

open access: yesActa Physica Polonica B Proceedings Supplement, 2013
Certain analysis methods have emerged recently that claim to reveal "higher harmonic flows" in more-central åcollisions at the RHIC and LHC. But pQCD calculations describe the same structures quantitatively.
openaire   +2 more sources

Raising and Lowering operators of spin-weighted spheroidal harmonics

open access: yes, 2016
In this paper we generalize the spin-raising and lowering operators of spin-weighted spherical harmonics to linear-in-$\gamma$ spin-weighted spheroidal harmonics where $\gamma$ is an additional parameter present in the second order ordinary differential ...
Shah, Abhay G., Whiting, Bernard F.
core   +3 more sources

The twisted higher harmonic signature for foliations

open access: yesJournal of Differential Geometry, 2011
We prove that the higher harmonic signature of an even dimensional oriented Riemannian foliation of a compact Riemannian manifold with coefficients in a leafwise U(p,q)-flat complex bundle is a leafwise homotopy invariant. We also prove the leafwise homotopy invariance of the twisted higher Betti classes.
Benameur, Moulay-Tahar   +1 more
openaire   +3 more sources

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