Results 71 to 80 of about 1,096,865 (195)
Assessment of image quality and detectability in computed tomography: Inter‐laboratory comparison of Fourier‐based metrics [PDF]
J Appl Clin Med PhysAbstract Background The task‐based assessment of image quality in computed tomography (CT) is increasingly used for benchmarking, optimizing acquisition and reconstruction parameters, and predicting observers’ performance. To achieve consistent and reproducible results rely on standardized methodologies and guidelines.
Monnin P +10 more
europepmc +2 more sources
First Observation of Four‐Band Ion Cyclotron Whistlers
Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.Abstract Ion cyclotron whistlers are frequently observed in low Earth orbit, typically formed when right‐hand polarized lightning whistlers undergo polarization reversal at crossover frequencies. In this study, we for the first time report a four‐band ion cyclotron whistler event detected by Van Allen Probe A.
Huicong Chen +6 more
wiley +1 more source
Fourier-positivity constraints on QCD dipole models
Physics Letters B, 2016 Fourier-positivity (F-positivity), i.e. the mathematical property that a function has a positive Fourier transform, can be used as a constraint on the parametrization of QCD dipole-target cross-sections or Wilson line correlators in transverse position ...
Bertrand G. Giraud, Robi Peschanski
doaj +1 more source
Random fractional Fourier transform : stochastic perturbations along the axis of propagation [PDF]
, 1999 The fractional Fourier transform (FRT) is known to be optically implementable with use of a medium with a perfect radial quadratic-index profile. Using the quantum-mechanical operator formalism, we examine the effects on the FRT action of such a medium
Abe, Sumiyoshi, Sheridan, John T.
core +1 more source
Revista Brasileira de Ensino de FísicaIn this work, Green's functions for the two-dimensional wave, Helmholtz and Poisson equations are calculated in the entire plane domain by means of the two-dimensional Fourier transform.
Roberto Toscano Couto
doaj +1 more source
On the Lebedev transformation in Hardy's spaces
International Journal of Mathematics and Mathematical Sciences, 2004 We establish the inverse Lebedev expansion with respect to parameters and arguments of the modified Bessel functions for an arbitrary function from Hardy's space H2,A, A>0.
Semyon B. Yakubovich
doaj +1 more source
Relating multipliers and transplantation for Fourier-Bessel expansionsand Hankel transform
, 2001 Proved are transference results that show connections between: a) multipliers for the Fourier-Bessel series and multipliers for the Hankel transform; b) maximal operators defined by Fourier-Bessel multipliers and maximal operators given by Hankel ...
Stempak, Krzysztof, Betancor, Jorge J.
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Le Matematiche, 1996 A special case of the biconfluent Heun equation which is not reducible to a form of a hypergeometric equation is solved by means of a Laplace transform. The solutions are double series which exhibit a type of orthogonality comparable in some respects to ...
Harold Exton
doaj
Современная математика: Фундаментальные направленияWe present the results concerning the research of the problem of the best recovery of the solution of the initial-boundary value problem for the heat equation with the Bessel operator in the spatial variable from two approximately known temperature ...
M. V. Polovinkina
doaj +1 more source
Generalized Fourier-Bessel transform of ( ) -Bessel-Lipschitz functions in the Space lp_
, 2015 In this paper, we obtain an analog of Theorem 5.2 in Younis [5] for the generalized Fourier-Bessel transform on the real line for functions satisfying the (, )- Bessel Lipschitz condition in the space Lp ,n, 1 < p ...
Anis Amalina
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