Results 21 to 30 of about 1,878 (250)

Superposition Principle and Kirchhoff’s Integral Theorem

open access: yesUniverse, 2022
The need for modification of the Huygens–Fresnel superposition principle arises even in the description of the free fields of massive particles and, more extensively, in nonlinear field theories. A wide range of formulations and superposition schemes for
Mikhail I. Krivoruchenko
doaj   +1 more source

Propagations of Sin-Gaussian Beam with Astigmatism through Oceanic Turbulence [PDF]

open access: yesE3S Web of Conferences, 2021
The propagation behaviours of a sin-Gaussian beam (SiGB) with astigmatism in oceanic water is analysed. The analytical expressions for the average intensity of such a beam are derived by using the extended Huygens-Fresnel integral.
Zhu Kaicheng   +4 more
doaj   +1 more source

Multi-Frequency Simulation of Ionospheric Scintillation Using a Phase-Screen Model

open access: yesNavigation, 2022
A fast Monte Carlo technique to simulate equatorial ionospheric scintillation on global navigation satellite system signals is proposed. The algorithm uses a single-layer phase-screen model of the ionosphere and the scintillation is expressed as a ...
Fernando D. Nunes   +2 more
doaj   +1 more source

Estimates of certain paraxial diffraction integral operator and its generalized properties

open access: yesAdvances in Difference Equations, 2020
This paper aims to discuss a generalization of certain paraxial diffraction integral operator in a class of generalized functions. At the start of this paper, we propose a convolution formula and establish certain convolution theorem.
Shrideh Al-Omari   +4 more
doaj   +1 more source

On the Fresnel sine integral and the convolution

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2003
The Fresnel sine integral S(x), the Fresnel cosine integral C(x), and the associated functions S+(x), S−(x), C+(x), and C−(x) are defined as locally summable functions on the real line.
Adem Kılıçman
doaj   +1 more source

End-to-End Optimization of an Achromatic Diffractive Optical Element Array for Integral Imaging Three-Dimensional Display

open access: yesIEEE Photonics Journal, 2022
Diffractive optical element (DOE) array promises compact shape for full-parallax integral imaging three-dimensional (3D) display. However, DOEs suffer from large chromatic aberration due to the strong wavelength-dependent nature of diffraction phenomena ...
Yuedi Wang   +7 more
doaj   +1 more source

Mathematical model of antenna with nonlinear characteristics for calculating the electromagnetic field in the Fresnel zone

open access: yesРадіоелектронні і комп'ютерні системи, 2021
The paper presents a mathematical model of radio-electronic systems (RES), which include antennas and their excitation paths with nonlinear characteristics.
Дмитро Вячеславович Грецьких   +4 more
doaj   +1 more source

The Hermite-Hadamard type inequalities for quasi p-convex functions

open access: yesAIMS Mathematics, 2023
In this paper, the Hermite-Hadamard inequality and its generalization for quasi p-convex functions are provided. Also several new inequalities are established for the functions whose first derivative in absolute value is quasi p-convex, which states some
Sevda Sezer, Zeynep Eken
doaj   +1 more source

Zeroes of functions of Fresnel complementary integral type

open access: yesRevista de Matemática: Teoría y Aplicaciones, 2017
Theoretical upper and lower bounds are established for zeroes of a parametric family of functions which are defined by integrals of the same type as  the Fresnel complementary integral.
Mario Alberto Villalobos Arias   +1 more
doaj   +1 more source

Holobricks: modular coarse integral holographic displays

open access: yesLight: Science & Applications, 2022
Here, we propose and demonstrate a modular holographic display system that allows seamless spatial tiling of multiple coarse integral holographic (CIH) displays called “holobricks”.
Jin Li, Quinn Smithwick, Daping Chu
doaj   +1 more source

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