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Articles de revues sur le sujet « Fourier terms »

Auteur : Grafiati

Publié le 25 janvier 2025

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1

Au-Yeung, Enrico, et John J. Benedetto. « Generalized Fourier Frames in Terms of Balayage ». Journal of Fourier Analysis and Applications 21, n^o 3 (4 décembre 2014) : 472–508. http://dx.doi.org/10.1007/s00041-014-9369-7.

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2

Révész, Sz Gy. « Rearrangement of Fourier series and fourier series whose terms have random signs ». Acta Mathematica Hungarica 63, n^o 4 (décembre 1994) : 395–402. http://dx.doi.org/10.1007/bf01874464.

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3

Zhang, Zhihua. « Fourier Expansions with Polynomial Terms for Random Processes ». Journal of Function Spaces 2015 (2015) : 1–12. http://dx.doi.org/10.1155/2015/763075.

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Based on calculus of random processes, we present a kind of Fourier expansions with simple polynomial terms via our decomposition method of random processes. Using our method, the expectations and variances of the corresponding coefficients decay fast and partial sum approximations attain the best approximation order. Moreover, since we remove boundary effect in our decomposition of random process, these coefficients can discover the instinct frequency information of this random process. Therefore, our method has an obvious advantage over traditional Fourier expansion. These results are also new for deterministic functions.

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4

Dukhnovsky, Sergey Anatolievich. « Secular Terms for the Kinetic Mckean Model ». Differential Equations and Control Processes, n^o 1 (2023) : 125–36. http://dx.doi.org/10.21638/11701/spbu35.2023.108.

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In this article, we investigate the kinetic McKean model. The perturbed solution of the Cauchy problem is sought in the form of Fourier series. The Fourier coefficients for the zero and nonzero modes are written out, respectively. The original system is reduced to an infinite system of differential equations. An approximation for the systems is constructed. Under certain assumptions, we find secular terms (non-integrable part). This, in turn, will allow us to prove for the first time the exponential stabilization of the solution in the future.

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5

Lü, Baida, Fanlong Kong et Bin Zhang. « Optical systems expressed in terms of fractional Fourier transforms ». Optics Communications 137, n^o 1-3 (avril 1997) : 13–16. http://dx.doi.org/10.1016/s0030-4018(96)00775-4.

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6

Getsadze, Rostom. « Divergence of Spherical General Terms of Double Fourier Series ». Journal of Fourier Analysis and Applications 12, n^o 5 (octobre 2006) : 597–604. http://dx.doi.org/10.1007/s00041-006-6045-6.

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7

Zozulya, V. V. « A High Order Theory for Linear Thermoelastic Shells : Comparison with Classical Theories ». Journal of Engineering 2013 (2013) : 1–19. http://dx.doi.org/10.1155/2013/590480.

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A high order theory for linear thermoelasticity and heat conductivity of shells has been developed. The proposed theory is based on expansion of the 3-D equations of theory of thermoelasticity and heat conductivity into Fourier series in terms of Legendre polynomials. The first physical quantities that describe thermodynamic state have been expanded into Fourier series in terms of Legendre polynomials with respect to a thickness coordinate. Thereby all equations of elasticity and heat conductivity including generalized Hooke's and Fourier's laws have been transformed to the corresponding equations for coefficients of the polynomial expansion. Then in the same way as in the 3D theories system of differential equations in terms of displacements and boundary conditions for Fourier coefficients has been obtained. First approximation theory is considered in more detail. The obtained equations for the first approximation theory are compared with the corresponding equations for Timoshenko's and Kirchhoff-Love's theories. Special case of plates and cylindrical shell is also considered, and corresponding equations in displacements are presented.

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8

Tang, Cong, Li-Yun Fu, Wenyong Pan, Qingqing Li et Jianping Huang. « Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles ». IEEE Access 8 (2020) : 32054–65. http://dx.doi.org/10.1109/access.2020.2973042.

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Roginskaya, Maria, et Michal Wojciechowski. « Singularity of Vector Valued Measures in Terms of Fourier Transform ». Journal of Fourier Analysis and Applications 12, n^o 2 (avril 2006) : 213–23. http://dx.doi.org/10.1007/s00041-005-5030-9.

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10

Bobkov, S. G. « Proximity of probability distributions in terms of Fourier-Stieltjes transforms ». Russian Mathematical Surveys 71, n^o 6 (31 décembre 2016) : 1021–79. http://dx.doi.org/10.1070/rm9749.

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11

Kendirli, Barış. « Fourier Coefficients of a Class of Eta Quotients of Weight 4 ». International Journal of Advanced Mathematical Sciences 4, n^o 1 (2 février 2016) : 4. http://dx.doi.org/10.14419/ijams.v4i1.5737.

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<p>Recently, there have been several works on the coefficients of the Fourier series expansions of a class of eta quotients by Williams, Yao, Xia and Jin, Kendirli, and Alaca. Some important explicit formulas have been discovered. Williams expressed all coefficients of one hundred and twenty-six eta quotients in terms of and and Yao, Xia and Jin, following the method of proof of Williams, expressed only even coefficients of one hundred and four eta quotients in terms of and The author has expressed the even and odd coefficients of the Fourier series expansions of a class of eta quotients in terms of and for Meanwhile, Alaca has obtained the coefficients of the Fourier series expansions of a class of eta quotients in in terms of and Here, we will express the coefficients of the Fourier series expansions of a class of eta quotients in in terms of and Fourier coefficients of the four eta quotients.</p>

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12

Strungaru, Nicolae. « On the Fourier Transformability of Strongly Almost Periodic Measures ». Canadian Journal of Mathematics 72, n^o 4 (29 janvier 2019) : 900–927. http://dx.doi.org/10.4153/s0008414x19000075.

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AbstractIn this paper we characterize the Fourier transformability of strongly almost periodic measures in terms of an integrability condition for their Fourier–Bohr series. We also provide a necessary and sufficient condition for a strongly almost periodic measure to be the Fourier transform of a measure. We discuss the Fourier transformability of a measure on $\mathbb{R}^{d}$ in terms of its Fourier transform as a tempered distribution. We conclude by looking at a large class of such measures coming from the cut and project formalism.

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13

YAMANE, Hideshi. « Fourier integral representation of harmonic functions in terms of a current ». Journal of the Mathematical Society of Japan 54, n^o 4 (octobre 2002) : 901–9. http://dx.doi.org/10.2969/jmsj/1191591996.

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14

King, Roy W., et Kathryn R. Williams. « The Fourier transform in chemistry—NMR : A glossary of NMR terms ». Journal of Chemical Education 67, n^o 4 (avril 1990) : A100. http://dx.doi.org/10.1021/ed067pa100.

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15

fryant, A., et H. Shankar. « Fourier coefficients and growth of harmonic functions ». International Journal of Mathematics and Mathematical Sciences 10, n^o 3 (1987) : 443–52. http://dx.doi.org/10.1155/s0161171287000528.

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We consider Harmonic Functions,Hof several variables. We obtain necessary and sufficient conditions on its Fourier coefficients so thatHis an entire harmonic (that is, has no finite singularities) function; the radius of harmonicity in terms of its Fourier coefficients in caseHis not entire. Further, we obtain, in terms of its Fourier coefficients, the Order and Type growth measures, both in caseHis entire or non-entire.

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16

Zhang, Xindan, et Haoyuan Zheng. « Signal Enhancement Methods Based on Wavelet Transform, Fractional Fourier Transform and Short-time Fourier Transform ». Highlights in Science, Engineering and Technology 76 (31 décembre 2023) : 222–30. http://dx.doi.org/10.54097/eyfndn07.

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This review paper mainly focuses on different signal enhancement methods such as wavelet transform, fractional Fourier transform (FrFT) and short-time Fourier transform (STFT). First, this paper introduces the concept and importance of signal enhancement, as well as some current issues and challenges. Then, in recent years, the application of the three methods in wavelet transform, fractional Fourier transform and short-time Fourier transform is described. In terms of wavelet transform, this paper discusses the application of wavelet function to image enhancement and the specific steps, and analyzes its advantages and application in signal enhancement. In terms of fractional Fourier transform, this paper introduces its difference from traditional Fourier transform, and discusses its application in combination with adaptive filtering technology and the application of multi-level FrFT in the field of speech enhancement. Finally, in terms of short-time Fourier transform, this paper discusses its application in the fields of image enhancement and speech enhancement. The review paper finally discusses the characteristics, advantages and limitations of these three methods in signal enhancement, and looks forward to the future research directions. Through the research of this review paper, it can provide some reference and guidance for the research in the field of signal enhancement.

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17

Belov, A. S., M. I. Dyachenko et S. Yu Tikhonov. « Functions with general monotone Fourier coefficients ». Russian Mathematical Surveys 76, n^o 6 (1 décembre 2021) : 951–1017. http://dx.doi.org/10.1070/rm10003.

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Abstract This paper is a study of trigonometric series with general monotone coefficients in the class with . Sharp estimates are proved for the Fourier coefficients of integrable and continuous functions. Also obtained are optimal results in terms of coefficients for various types of convergence of Fourier series. For two-sided estimates are obtained for the -moduli of smoothness of sums of series with -coefficients, as well as for the (quasi-)norms of such sums in Lebesgue, Lorentz, Besov, and Sobolev spaces in terms of Fourier coefficients. Bibliography: 99 titles.

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18

Stokke, Ross. « Amenable representations and coefficient subspaces of Fourier-Stieltjes algebras ». MATHEMATICA SCANDINAVICA 98, n^o 2 (1 juin 2006) : 182. http://dx.doi.org/10.7146/math.scand.a-14990.

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Amenable unitary representations of a locally compact group, $G$, are studied in terms of associated coefficient subspaces of the Fourier-Stieltjes algebra $B(G)$, and in terms of the existence of invariant and multiplicative states on associated von Neumann and $C^*$-algebras. We introduce Fourier algebras and reduced Fourier-Stieltjes algebras associated to arbitrary representations, and study amenable representations in relation to these algebras.

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19

Matlam, Prof Jayprakash, Prof Suniilkumar Shende et Dr Dipak G. Lanjewar. « Applications of Fourier series and Fourier Transform in Electrical and Electronics Devices ». International Journal for Research in Applied Science and Engineering Technology 11, n^o 4 (30 avril 2023) : 1657–67. http://dx.doi.org/10.22214/ijraset.2023.50376.

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Abstract: Fourier series are of great importance in both theoretical and ap plied mathematics. For orthonormal families of complexvalued functions Fourier Series are sums of the φn that can approximate periodic, complexvalued functions with arbitrary precision. This paper will focus on the Fourier Series of the complex exponentials. Of the many possi ble methods of estimating complexvalued functions, Fourier series are especially attractive because uniform convergence of the Fourier series (as more terms are added) is guaranteed for continuous, bounded functions. Furthermore, the Fourier coefficients are designed to minimize the square of the error from the actual function. Finally, complex exponentials are relatively simple to deal with and ubiquitous in physical phenomena. This paper first defines generalized Fourier series, with an emphasis on the se ries with complex exponentials. Then, important properties of Fourier series are described and proved, and their relevance is explained. A complete example is then given, and the paper concludes by briefly mentioning some of the applications of Fourier series and the generalization of Fourier series, Fourier transforms. In the mideighteenth century, physical problems such as the conduction pat terns of heat and the study of vibrations and oscillations led to the study of Fourier series. Of central interest was the problem of how arbitrary realvalued functions could be represented by sums of simpler functions. As we shall see later, a Fourier series is an infinite sum of trigonometric functions that can be used to model realvalued, periodic functions. We shall begin by giving a brief description of the trigonometric polynomials,and especially of their relation to the complex exponentials. The Fourier series, the founding principle behind the field of Fourier analysis, is an infinite expansion of function in terms sine’s and cosines. Fourier transform provides a continuous complex frequency of a function. It is useful in the study of frequency response of a filter, solution PDE, Discrete Fourier transform and FFT in the signals analysis. The advent of Fourier transformation method has greatly extended our ability to implement Fourier methods on digital multimedia visualization system. It covers the mathematical foundations of Digital signal processing (DSP), classical sound, synthesis algorithms and multi-time frequency domain analysis associated musical sound. In this paper, we are analysis of square wave in terms of Fourier component, may occur in electric circuits designed to handle sharply rising pulses and how to convert analog to digital system by using Fourier transform and its applications in electronics and digital multimedia visualization signal process of communication system.

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20

WANG, RUI, YUESHENG XU et HAIZHANG ZHANG. « FAST NONLINEAR FOURIER EXPANSIONS ». Advances in Adaptive Data Analysis 01, n^o 03 (juillet 2009) : 373–405. http://dx.doi.org/10.1142/s1793536909000163.

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Motivated by the analytic signal approach and general construction methods by Qian et al. (accepted by Adv. Comput. Math.), we construct a class of orthonormal bases for the real signal space [Formula: see text], which have nonconstant physically meaningful instantaneous frequencies. We develop a fast algorithm for computing the Hilbert–Fourier expansion of a given function in terms of the orthonormal bases. Moreover, we study the approximation properties of the Hilbert–Fourier expansion. A numerical example is presented to demonstrate an adaptive Fourier expansion based on an optimal selection of the parameter a in the orthonormal bases according to the approximation error.

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21

Zhao, Tieyu, et Yingying Chi. « Multiweighted-Type Fractional Fourier Transform : Unitarity ». Fractal and Fractional 5, n^o 4 (8 novembre 2021) : 205. http://dx.doi.org/10.3390/fractalfract5040205.

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The definition of the discrete fractional Fourier transform (DFRFT) varies, and the multiweighted-type fractional Fourier transform (M-WFRFT) is its extended definition. It is not easy to prove its unitarity. We use the weighted-type fractional Fourier transform, fractional-order matrix and eigendecomposition-type fractional Fourier transform as basic functions to prove and discuss the unitarity. Thanks to the growing body of research, we found that the effective weighting term of the M-WFRFT is only four terms, none of which are extended to M terms, as described in the definition. Furthermore, the program code is analyzed, and the result shows that the previous work (Digit Signal Process 2020: 104: 18) based on MATLAB for unitary verification is inaccurate.

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22

Maksimovic, Snjezana, Stevan Pilipovic, Petar Sokoloski et Jasson Vindas. « Wave fronts via Fourier series coefficients ». Publications de l'Institut Math?matique (Belgrade) 97, n^o 111 (2015) : 1–10. http://dx.doi.org/10.2298/pim150107001m.

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23

QIAN, TAO, et YANBO WANG. « REMARKS ON ADAPTIVE FOURIER DECOMPOSITION ». International Journal of Wavelets, Multiresolution and Information Processing 11, n^o 01 (janvier 2013) : 1350007. http://dx.doi.org/10.1142/s0219691313500070.

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This is a continuation of the study of adaptive Fourier decomposition (AFD).15 Under a mild condition not in terms of smoothness, a convergence rate is provided. We prove that the selection of the parameters corresponding to Fourier series in the average sense is optimal. We also present the transformation matrices between the adaptive rational orthogonal system and the related sequence of the shifted Cauchy kernels and their derivatives.

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24

Herwig, H., et K. Beckert. « Fourier Versus Non-Fourier Heat Conduction in Materials With a Nonhomogeneous Inner Structure ». Journal of Heat Transfer 122, n^o 2 (17 novembre 1999) : 363–65. http://dx.doi.org/10.1115/1.521471.

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Distinct non-Fourier behavior in terms of finite propagation velocity and a hyperbolic wave like character of heat conduction has been reported for certain materials in several studies published recently. However, there is some doubt concerning these findings. The objective of this note is to present experimental evidence for a perfectly Fourier-like behavior of heat conduction in those materials with nonhomogeneous inner structure that have been under investigation in the other studies. This controversy needs to be settled in order to understand the physics of heat conduction in these materials. [S0022-1481(00)00102-X]

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25

Ouadih, Salah El, et Radouan Daher. « Characterization of Dini Lipschitz Functions in Terms of Their Helgason Transform ». Annals of West University of Timisoara - Mathematics and Computer Science 54, n^o 2 (1 décembre 2016) : 117–30. http://dx.doi.org/10.1515/awutm-2016-0018.

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Abstract In this paper, using a generalized translation operator, we obtain an analog of Younis Theorem 5.2 in [6] for the Helgason Fourier transform of a set of functions satisfying the Dini Lipschitz condition in the space L2 for functions on noncompact rank one Riemannian symmetric spaces.

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26

Gourevitch, Dmitry, Henrik P. A. Gustafsson, Axel Kleinschmidt, Daniel Persson et Siddhartha Sahi. « A reduction principle for Fourier coefficients of automorphic forms ». Mathematische Zeitschrift 300, n^o 3 (15 octobre 2021) : 2679–717. http://dx.doi.org/10.1007/s00209-021-02784-w.

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AbstractWe consider a special class of unipotent periods for automorphic forms on a finite cover of a reductive adelic group $$\mathbf {G}(\mathbb {A}_\mathbb {K})$$ G ( A K ) , which we refer to as Fourier coefficients associated to the data of a ‘Whittaker pair’. We describe a quasi-order on Fourier coefficients, and an algorithm that gives an explicit formula for any coefficient in terms of integrals and sums involving higher coefficients. The maximal elements for the quasi-order are ‘Levi-distinguished’ Fourier coefficients, which correspond to taking the constant term along the unipotent radical of a parabolic subgroup, and then further taking a Fourier coefficient with respect to a $${\mathbb K}$$ K -distinguished nilpotent orbit in the Levi quotient. Thus one can express any Fourier coefficient, including the form itself, in terms of higher Levi-distinguished coefficients. In companion papers we use this result to determine explicit Fourier expansions of minimal and next-to-minimal automorphic forms on split simply-laced reductive groups, and to obtain Euler product decompositions of certain Fourier coefficients.

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27

Erden, M. Fatih, David Mendlovic et Haldun M. Ozaktas. « Propagation of mutual intensity expressed in terms of the fractional Fourier transform ». Journal of the Optical Society of America A 13, n^o 5 (1 mai 1996) : 1068. http://dx.doi.org/10.1364/josaa.13.001068.

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28

Getsadze, Rostom. « On divergence of the general terms of the double Fourier-Haar series ». Archiv der Mathematik 86, n^o 4 (avril 2006) : 331–39. http://dx.doi.org/10.1007/s00013-005-1577-6.

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29

Akama, Hachiro. « An extension of the fourier convolution theorem in terms of poisson brackets ». Physica A : Statistical Mechanics and its Applications 149, n^o 3 (avril 1988) : 631–37. http://dx.doi.org/10.1016/0378-4371(88)90124-0.

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30

Kannan, Ravi. « A High Order Spectral Volume Formulation for Solving Equations Containing Higher Spatial Derivative Terms : Formulation and Analysis for Third Derivative Spatial Terms Using the LDG Discretization Procedure ». Communications in Computational Physics 10, n^o 5 (novembre 2011) : 1257–79. http://dx.doi.org/10.4208/cicp.070710.100111a.

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AbstractIn this paper, we develop a formulation for solving equations containing higher spatial derivative terms in a spectral volume (SV) context; more specifically the emphasis is on handling equations containing third derivative terms. This formulation is based on the LDG (Local Discontinuous Galerkin) flux discretization method, originally employed for viscous equations containing second derivatives. A linear Fourier analysis was performed to study the dispersion and the dissipation properties of the new formulation. The Fourier analysis was utilized for two purposes: firstly to eliminate all the unstable SV partitions, secondly to obtain the optimal SV partition. Numerical experiments are performed to illustrate the capability of this formulation. Since this formulation is extremely local, it can be easily parallelized and a h-p adaptation is relatively straightforward to implement. In general, the numerical results are very promising and indicate that the approach has a great potential for higher dimension Korteweg-de Vries (KdV) type problems.

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Toscani, Giuseppe. « On Fourier-Based Inequality Indices ». Entropy 24, n^o 10 (29 septembre 2022) : 1393. http://dx.doi.org/10.3390/e24101393.

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Inequality indices are quantitative scores that take values in the unit interval, with a zero score denoting complete equality. They were originally created to measure the heterogeneity of wealth metrics. In this study, we focus on a new inequality index based on the Fourier transform that demonstrates a number of intriguing characteristics and shows great potential for applications. By extension, it is demonstrated that other inequality measures, such as the Gini and Pietra indices, can be usefully stated in terms of the Fourier transform, allowing us to illuminate characteristics in a novel and straightforward manner.

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GERNOTH, K. A. « QUASICLASSICAL FOURIER PATH INTEGRAL QUANTUM CORRECTION TERMS TO THE KINETIC ENERGY OF INTERACTING QUANTUM MANY-BODY SYSTEMS ». International Journal of Modern Physics B 23, n^o 20n21 (20 août 2009) : 3979–91. http://dx.doi.org/10.1142/s0217979209063201.

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A quasiclassical expression for the kinetic energy of interacting quantum many-body systems is derived from the full quantum expression for the kinetic energy as derived by means of the Fourier path integral representation of the canonical many-body density matrix of such systems. This quasiclassical form of the kinetic energy may be cast in the shape of thermodynamic expectation values w.r.t. to the classical Boltzmann distribution of the many-body system, which involves only the many-body interaction in contrast to the full Fourier path integral quantum distribution, which carries contributions also from the many-body kinetic energy operator. The quasiclassical quantum correction terms to the classical Boltzmann equipartition value are valid when the product of temperature and particle mass is large and then lead to significant technical simplifications and increase of speed of Monte Carlo computations of the quantum kinetic energy. The formal findings are tested numerically in quantum Fourier path integral versus classical Monte Carlo simulations.

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Kou, Kit Ian, et Hong Li. « Greedy adaptive decomposition of signals based on nonlinear Fourier atoms ». International Journal of Wavelets, Multiresolution and Information Processing 14, n^o 03 (mai 2016) : 1650014. http://dx.doi.org/10.1142/s0219691316500144.

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This paper aims at adaptive decomposition of signals in terms of nonlinear Fourier atoms. Each nonlinear Fourier atom is analytic and mono-component. The algorithm is considered as an adaptive greedy procedure based on nonlinear Fourier atoms. The convergence results for the proposed algorithms show that it is suitable to approximate a signal by a linear combinations of nonlinear Fourier atoms. Experiments are presented to illustrate the proposed algorithm and theory.

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Akhazhanov, T. B., N. А. Bokayev, D. T. Matin et T. Aktosun. « Coefficients of multiple Fourier-Haar series and variational modulus of continuity ». BULLETIN OF THE KARAGANDA UNIVERSITY-MATHEMATICS 112, n^o 4 (29 décembre 2023) : 21–29. http://dx.doi.org/10.31489/2023m4/21-29.

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In this paper, we introduce the concept of a variational modulus of continuity for functions of several variables, give an estimate for the sum of the coefficients of a multiple Fourier-Haar series in terms of the variational modulus of continuity, and prove theorems of absolute convergence of series composed of the coefficients of multiple Fourier-Haar series. In this paper, we study the issue of the absolute convergence for multiple series composed of the Fourier-Haar coefficients of functions of several variables of bounded p-variation. We estimate the coefficients of a multiple Fourier-Haar series in terms of the variational modulus of continuity and prove the sufficiency theorem for the condition for the absolute convergence of series composed of the Fourier-Haar coefficients of the considered function class. This paper researches the question: under what conditions, imposed on the variational modulus of continuity of the fractional order of several variables functions, there is the absolute convergence for series composed of the coefficients of multiple Fourier-Haar series.

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Prasad, Akhilesh, et Manoj K. Singh. « Pseudo-differential operators associated with the Jacobi differential operator and Fourier-cosine wavelet transform ». Asian-European Journal of Mathematics 08, n^o 01 (mars 2015) : 1550010. http://dx.doi.org/10.1142/s1793557115500102.

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Using the inverse of Fourier–Jacobi transform a symbol is defined, and the pseudo-differential operator (p.d.o.) 𝒫α, β (x,D) associated with Jacobi-differential operator in terms of this symbol is defined. It is shown that the p.d.o. is bounded in a certain Sobolev type space associated with the Fourier–Jacobi transform. Continuous Jacobi wavelet transform (JWT) and Fourier-cosine wavelet transform are defined and a reconstruction formula is obtained for Fourier-cosine wavelet transform. Properties of Fourier-cosine wavelet transform are investigated.

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Lynes, JA. « Fourier components of cylindrical illuminance ». Lighting Research & ; Technology 51, n^o 8 (21 mars 2019) : 1224–36. http://dx.doi.org/10.1177/1477153519837317.

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Fourier analysis is applied to the profile of illuminance around the curved surface of a small cylinder, due to one, two and three point sources of light and due to an extended source. This reveals only one odd harmonic, whose amplitude is equal to half that of the illumination vector. Lighting can also generate a diminishing series of even harmonics. The lighting at any point in open space can be expressed in terms of the harmonics of illuminance around three mutually perpendicular cylinders. Visual discomfort is often associated with the presence of even harmonics. The photometry of cylindrical and semi-cylindrical illuminance, and of cylindrical harmonics, is discussed.

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Gogoladze, L. « On Estimating Integral Moduli of Continuity of Functions of Several Variables in Terms of Fourier Coefficients ». gmj 6, n^o 4 (août 1999) : 307–22. http://dx.doi.org/10.1515/gmj.1999.307.

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38

Gupta, Umesh Kumar, et Subhash Kumar Sharma. « Fourier Seriesand its Physical Application-A Study ». Journal of Ultra Scientist of Physical Sciences Section A 34, n^o 2 (27 février 2022) : 28–41. http://dx.doi.org/10.22147/jusps-a/340201.

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Fourier series are of great importance in both theoretical and applied mathematics. This paper will focus on the Fourier series of the complex exponentials of the many possible methods of estimating complex valued functions, Fourier series are especially attractive because uniform convergence of the Fourier series (as more terms are added) is guaranteed for continuous , bounded functions. After studying this paper we will learn about how Fourier transforms is useful in many physical applications, such as partial differential equations and heat transfer equations. one can solve many important problems of physics with very simple way.

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Guven, Ali. « Approximation of continuous functions on hexagonal domains ». Journal of Numerical Analysis and Approximation Theory 47, n^o 1 (6 août 2018) : 42–57. http://dx.doi.org/10.33993/jnaat471-1128.

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Some approximation properties of hexagonal Fourier series are investigated. The order of approximation by Nörlund means of hexagonal Fourier series is estimated in terms of modulus of continuity.

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Cohl, Howard S., et Diego E. Dominici. « Generalized Heine’s identity for complex Fourier series of binomials ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 467, n^o 2126 (7 juillet 2010) : 333–45. http://dx.doi.org/10.1098/rspa.2010.0222.

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In his treatise, Heine ( Heine 1881 In Theorie und Anwendungen ) gave an identity for the Fourier series of the function , with , and z >1, in terms of associated Legendre functions of the second kind . In this paper, we generalize Heine’s identity for the function , with , and , in terms of . We also compute closed-form expressions for some .

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LI, WENXIN, DAVID ZHANG et ZHUOQUN XU. « PALMPRINT IDENTIFICATION BY FOURIER TRANSFORM ». International Journal of Pattern Recognition and Artificial Intelligence 16, n^o 04 (juin 2002) : 417–32. http://dx.doi.org/10.1142/s0218001402001757.

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Palmprint identification refers to searching in a database for the palmprint template, which is from the same palm as a given palmprint input. The identification process involves preprocessing, feature extraction, feature matching and decision-making. As a key step in the process, in this paper, we propose a new feature extraction method by converting a palmprint image from a spatial domain to a frequency domain using Fourier Transform. The features extracted in the frequency domain are used as indexes to the palmprint templates in the database and the searching process for the best match is conducted by a layered fashion. The experimental results show that palmprint identification based on feature extraction in the frequency domain is effective in terms of accuracy and efficiency.

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Igenberlina, A., et Zh Keulimzhayeva. « On the strong summability of the Fourier–Walsh series in the Besov space ». Ukrains’kyi Matematychnyi Zhurnal 76, n^o 9 (30 septembre 2024) : 1304–15. http://dx.doi.org/10.3842/umzh.v76i9.7577.

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UDC 517.5 The Fourier–Walsh series of even continuous functions may be divergent at some points. Moreover, among integrable functions, there are functions such that their Fourier–Walsh series diverge everywhere on [ 0,1 ) . In this connection, it becomes necessary to consider various summation methods that would allow us to restore the function according to its Fourier–Walsh series. We also investigate the Besov space on a dyadic group in terms of strong summability. Finally, we present necessary information about the Fourier–Walsh transform.

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Uchiyama, Akihito. « On the Characterization of H p (R n ) in Terms of Fourier Multipliers ». Proceedings of the American Mathematical Society 109, n^o 1 (mai 1990) : 117. http://dx.doi.org/10.2307/2048370.

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Morales, Y., L. Díaz et C. Torres. « Radial Hilbert Transform in terms of the Fourier Transform applied to Image Encryption ». Journal of Physics : Conference Series 582 (14 janvier 2015) : 012063. http://dx.doi.org/10.1088/1742-6596/582/1/012063.

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Yu, Dansheng, Ping Zhou et Songping Zhou. « On determination of jumps in terms of Abel–Poisson mean of Fourier series ». Journal of Mathematical Analysis and Applications 341, n^o 1 (mai 2008) : 12–23. http://dx.doi.org/10.1016/j.jmaa.2007.09.055.

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Artamonov, S. Yu. « Quality of approximation by fourier means in terms of general moduli of smoothness ». Mathematical Notes 98, n^o 1-2 (juillet 2015) : 3–10. http://dx.doi.org/10.1134/s0001434615070019.

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García-Cuerva, José, et Víctor I. Kolyada. « Rearrangement Estimates for Fourier Transforms inLp andHp in Terms of Moduli of Continuity ». Mathematische Nachrichten 228, n^o 1 (août 2001) : 123–44. http://dx.doi.org/10.1002/1522-2616(200108)228:1<123 ::aid-mana123>3.0.co;2-a.

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Nunes de Oliveira, João Francisco, Roberta Veloso Garcia, Hélio Koiti Kuga et Estaner Claro Romão. « Efficiency of Solution Methods for Kepler’s Equation ». Applied Mechanics and Materials 851 (août 2016) : 587–92. http://dx.doi.org/10.4028/www.scientific.net/amm.851.587.

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This article discusses, in the case of eccentric orbits, some solution methods for Kepler's equation, for instance: Newton's method, Halley method and the solution by Fourire-Bessel expansion. The efficiency of solution methods is evaluated according to the number of iterations that each method needs to lead to a solution within the specified tolerance. The solution using Fourier-Bessel series is not an iterative method, however, it was analyzed the number of terms required to achieve the accuracy of the prescribed solution.

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CARDONE, FABIO, ROBERTO MIGNANI et VLADYSLAV S. OLKHOVSKY. « FOURIER-INTEGRAL DESCRIPTION OF SUPERLUMINAL PHOTON TUNNELING ». Modern Physics Letters B 14, n^o 04 (20 février 2000) : 109–17. http://dx.doi.org/10.1142/s0217984900000173.

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We give a general Fourier-integral description of photon tunneling which can be applied either to electromagnetic waveguides and to optical devices. Moreover, we extend to the case of frustrated total internal reflection our previous treatment of superluminal tunneling of evanescent waves in terms of a spacetime deformation.

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Williams, Earl G. « Fourier acoustics : Uncovering the origins of sound ». Journal of the Acoustical Society of America 153, n^o 3_supplement (1 mars 2023) : A208. http://dx.doi.org/10.1121/10.0018675.

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No doubt, Jean-Baptiste Joseph Fourier has had a great impact in science. At the root of Fourier Acoustics, the Fourier series, when employed as a starting point and manipulated, allows us to uncover the origins of sound in a simple and elegant way, not only in acoustics but also in electromagnetics. A well-known stepping stone on the path is nearfield acoustical holography (NAH) and its theory can be recast almost completely, and simply, in terms of two-dimensional (2D) Fourier series and applied to any geometry. For separable coordinate systems, each of the components of the series can be propagated to a surface conformal to the measurement surface using an analytically defined propagator. But even when the surfaces are not part of a separable system, the spirit of Fourier’s expansions is mirrored with the singular value decomposition, applied to a numerically derived propagator constructed using the equivalent source method. A comprehensive demonstration of Fourier acoustics applied to aeroacoustics was in the cabin of a Boeing aircraft, in flight, using a two-dimensional spherical array. Reconstructions of vector intensity in a volume from correlations of the measured pressure to panel accelerometers showed the direction and location of the dominant fuselage sources of noise—uncovering the origin of sound. [Work supported by the Office of Naval Research.]

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