Results 11 to 20 of about 469,971 (293)
Two-Dimensional Fourier-Transform Spectroscopy of Potassium Vapor [PDF]
Conference on Lasers and Electro-Optics 2010, 2010 Optical two-dimensional Fourier-transformed (2DFT) spectroscopy is used to study the coherent optical response of potassium vapor in a thin transmission cell. Rephasing and non-rephasing spectra of the D1 and D2 transitions are obtained and compared to numerical simulations.
Dai, X. +3 more
openaire +3 more sources
A variational restriction theorem [PDF]
, 2020 We establish variational estimates related to the problem of restricting the Fourier transform of a three-dimensional function to the two-dimensional Euclidean sphere.
Kovač, Vjekoslav +1 more
core +2 more sources
On the class of uncertainty inequalities for the coupled fractional Fourier transform
Journal of Inequalities and Applications, 2022 The coupled fractional Fourier transform F α , β $\mathcal {F}_{\alpha ,\beta}$ is a two-dimensional fractional Fourier transform depending on two angles α and β, which are coupled in such a way that the transform parameters are γ = ( α + β ) / 2 $\gamma
Firdous A. Shah +3 more
doaj +1 more source
EURASIP Journal on Wireless Communications and Networking, 2023 In this paper, a two-dimensional generalized weighted fractional Fourier transform (2DGWFRFT) and constellation scrambling (CS)-based secure spatial modulation (SM) scheme, called 2DGWFRFT-CS-SM, is proposed to enhance the physical layer security (PLS ...
Yongxin Huang +3 more
doaj +1 more source
Frontiers in Earth Science, 2023 The day/night band channel on the JPSS series of satellites can detect the light and dark fringes of oceanic internal waves due to the reflectivity difference caused by the roughness of the sea surface under moon flare conditions.
Hao Li +5 more
doaj +1 more source
Digital processing of space images using global filtering in the frequency area [PDF]
E3S Web of Conferences, 2021 In modern systems, remote sensing widespread two-dimensional fast Fourier transform (FFT) for processing satellite images and the subsequent image filtering.
Tutatchikov Valeriy, Noskov Mikhail
doaj +1 more source
Frequency invariant beamforming for two-dimensional and three-dimensional arrays [PDF]
, 2007 A novel method for the design of two-dimensional (2-D) and three-dimensional (3-D)arrays with frequency invariant beam patterns is proposed. By suitable substitu- tions, the beam pattern of a 2-D or 3-D arrays can be regarded as the 3-D or 4-D Fourier ...
Doles III +13 more
core +1 more source
Alexandria Engineering Journal, 2021 In this communication we have studied well known physical process of two-dimensional advection–diffusion phenomena. The advection–diffusion equation is time-fractionalized by exploiting Atangana-Baleanu fractional derivative operator.
Itrat Abbas Mirza +4 more
doaj +1 more source
Multipole matrix elements of Green function of Laplace equation [PDF]
, 2015 Multipole matrix elements of Green function of Laplace equation are calculated. The multipole matrix elements of Green function in electrostatics describe potential on a sphere which is produced by a charge distributed on the surface of a different ...
Górka, Przemysław, Makuch, Karol
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A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
Micromachines, 2023 This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA.
Haijin Fu +8 more
doaj +1 more source