Results 21 to 30 of about 9,069,692 (293)
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.
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Estimates for commutators of orthogonal fourier series [PDF]
, 1996 In this paper we study weighted norm inequalities for the commutators [b, Sn] where b is a BMO function and Sn denotes the nth partial sum of the Fourier series relative to a system of orthogonal polynomials on [-1, 1] with respect to general weights ...
Guadalupe, J.J. +2 more
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Weak behaviour of Fourier-Jacobi series [PDF]
, 1990 Necessary conditions for the weak convergence of Fourier series in orthogonal polynomials are given. It is shown that the partial sum operator associated with the Jacobi series is of restricted weak type, but not of weak type, for the endpoints of the ...
Guadalupe, J., Pérez, M., Varona, J.L.
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Abstract and Applied Analysis, 2013 There are obtained integral form and recurrence representations for some Fourier series and connected with them Favard constants. The method is based on preliminary integration of Fourier series which permits to establish general recursion formulas for ...
Snezhana Georgieva Gocheva-Ilieva +1 more
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Pesquisa Agropecuária Brasileira, 2009 O objetivo deste trabalho foi desenvolver um modelo matemático de estimativa da temperatura média diária do ar no Estado de Goiás, que considera simultaneamente as variações espacial e temporal. O modelo foi desenvolvido por meio de uma combinação linear
Jorge Cesar dos Anjos Antonini +3 more
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Effect of data gaps: comparison of different spectral analysis methods [PDF]
Annales Geophysicae, 2016 In this paper we investigate quantitatively the effect of data gaps for four methods of estimating the amplitude spectrum of a time series: fast Fourier transform (FFT), discrete Fourier transform (DFT), Z transform (ZTR) and the Lomb–Scargle ...
C. Munteanu +8 more
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Current-Sensing Topology with Multi Resistors in Parallel and Its Protection Circuit
Applied Sciences, 2023 Current-sensing topology with multi resistors in series has limitations in improving the dynamic range of current acquisition, so a sensing topology with multi resistors in parallel is proposed. The overcurrent state of a parallel shunt circuit cannot be
Xuan Gou +4 more
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Low frequency error analysis and calibration for multiple star sensors system of GaoFen7 satellite
Geo-spatial Information Science, 2022 The GaoFen7 (GF7) optical satellite is the first Chinese civilian sub-meter high-resolution stereo mapping satellite and is equipped with a double linear array camera and laser altimeter to achieve large-scale topographic mapping. To improve the accuracy
Yanli Wang +3 more
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Heptagon functions and seven-gluon amplitudes in multi-Regge kinematics
Journal of High Energy Physics, 2021 We compute all 2 → 5 gluon scattering amplitudes in planar N $$ \mathcal{N} $$ = 4 super-Yang-Mills theory in the multi-Regge limit that is sensitive to the non-trivial (“long”) Regge cut.
Lance J. Dixon +2 more
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Journal of Marine Science and Engineering, 2022 The problem of ice loads acting on multiple vertical cylinders of circular cross-sections frozen in an ice cover of infinite extent is studied. The loads are caused by a flexural-gravity wave propagating in the ice cover towards the rigid bottom-mounted ...
Nazile B. Disibuyuk +3 more
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