Results 21 to 30 of about 237,467 (314)

A SPECTRAL METHOD FOR DECONVOLVING A DENSITY [PDF]

open access: yesEconometric Theory, 2010
We propose a new estimator for the density of a random variable observed with an additive measurement error. This estimator is based on the spectral decomposition of the convolution operator, which is compact for an appropriate choice of reference spaces.
Carrasco, Marine, Florens, Jean-Pierre
openaire   +3 more sources

DETERMINATION OF ELECTROMAGNETIC RADIATION EMITTED BY TELECOMMUNICATION EQUIPMENT OF TRANSMISSION CENTERS

open access: yesInformatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska, 2013
Determining and forecasting of environmental influence of telecommunication equipment that is a source of electromagnetic radiation is still an actual challenge.
Oleksandr Naumchuk
doaj   +1 more source

Temporal Coherence Estimators for GBSAR

open access: yesRemote Sensing, 2022
Many Ground-Based Synthetic Aperture Radar (GBSAR) applications demand preliminary analysis to select areas with high-quality signal. That is, areas in which the phase can be processed to extract the desired information. The interferometric coherence and
Alessandra Beni   +3 more
doaj   +1 more source

Testing equality of spectral densities [PDF]

open access: yesResearch Papers in Economics, 2007
We develop a test of the hypothesis that the spectral densities of a number m, m ≥ 2, not necessarily independent time series are equal. The test proposed is based on an appropriate L 2 -distance measure between the nonpara- metrically estimated individual spectral densities and an overall, ’pooled’ spectral density, the later being obtained using the ...
Dette, Holger, Paroditis, Efstathios
openaire   +4 more sources

Estimating Spectral Density Functions Robustly

open access: yesRevstat Statistical Journal, 2007
We consider in the following the problem of robust spectral density estimation. Unfortunately, conventional spectral density estimators are not robust in the presence of additive outliers (cf. [18]).
Bernhard Spangl , Rudolf Dutter
doaj   +1 more source

Using stochastic characteristics of vibroacoustic oscillations in the analysis of the dynamic quality of machine tools

open access: yesИзвестия высших учебных заведений. Поволжский регион:Технические науки, 2022
Background. Application of stability margin of dynamic system, integral estimates of autocorrelation functions and spectra of vibro-acoustic oscillations in machine tools is relevant for evaluation of their dynamic quality and purpose of cutting mode ...
A.A. Ignat'ev   +3 more
doaj   +1 more source

Energy spectrum and phase diagrams of two-sublattice hard-core boson model

open access: yesCondensed Matter Physics, 2013
The energy spectrum, spectral density and phase diagrams have been obtained for two-sublattice hard-core boson model in frames of random phase approximation approach.
I.V. Stasyuk, O. Vorobyov
doaj   +1 more source

Dynamics of hindered CF3-rotor in 2,5-bis (trifl uoromethyl )-nitroben zene radical -anion in anhydro us DMF. A temperature - activation theory of reversible HFS transformations of EPR spectrum

open access: yesТонкие химические технологии, 2016
The temperature dependence of EPR spectrum of 2,5-bis(trifluoromethyl)nitrobenzene radical anion in anhydrous DMF was investigated. Internal dynamics of hindered rotation of the CF3-group in ortho-position to NO2-group causes HFS modulation. The spectrum
E. A. Polenov, P. V. Melnikov
doaj   +1 more source

Simulation and experimental development of a temperature control system of a radiation calibration source based on a PID-regulyator

open access: yesВестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2017
Improvement of methods of radiometric correction for multichannel spectral hardware and wide usage of LED-sources require the development of both mathematical and experimental methods of calibration of the obtained spectral data.
V. V. Volkov
doaj   +1 more source

Spectral properties of the generalized diluted Wishart ensemble

open access: yesJournal of Physics: Complexity, 2022
The celebrated Marčenko–Pastur law, that considers the asymptotic spectral density of random covariance matrices, has found a great number of applications in physics, biology, economics, engineering, among others.
Isaac Pérez Castillo
doaj   +1 more source

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