نتایج جستجو برای: fourier field equation
تعداد نتایج: 1041582 فیلتر نتایج به سال:
INTRODUCTION A novel image reconstruction technique, which avoids aliasing artifacts by scalable image reconstruction in Magnetic Resonance Imaging, is proposed. The signal obtained in the phase-scrambling Fourier imaging technique can be transformed to the signal described in the Fresnel transform equation of the objects. Therefore, image reconstruction can be performed not only by inverse Fou...
Rotational transformation based on coordinate rotation in Fourier space is a useful technique for simulating wave field propagation between nonparallel planes. This technique is characterized by fast computation because the transformation only requires executing a fast Fourier transform twice and a single interpolation. It is proved that the formula of the rotational transformation mathematical...
The scalar wave equation, or Helmholtz equation, describes within a certain approximation the electromagnetic field distribution in a given system. In this paper we show how to solve the Helmholtz equation in complex geometries using conformal mapping and the homotopy perturbation method. The solution of the mapped Helmholtz equation is found by solving an infinite series of Poisson equations u...
in the present work, a hybrid of fourier transform and homotopy perturbation method is developed for solving the non-homogeneous partial differential equations with variable coefficients. the fourier transform is employed with combination of homotopy perturbation method (hpm), the so called fourier transform homotopy perturbation method (fthpm) to solve the partial differential equations. the c...
Different numerical approaches for the stray-field calculation in the context of micromagnetic simulations are investigated. We compare finite difference based fast Fourier transform methods, tensor-grid methods and the finite-element method with shell transformation in terms of computational complexity, storage requirements and accuracy tested on several benchmark problems. These methods can b...
znfe2o4 mixed spinel ferrite nanoparticles obtained through a citrate-nitrate combustion method. ignited products calcined at different temperatures in 600-900ºc range and effect of calcination treatment temperature investigated. final products characterized by x-ray diffraction (xrd), fourier-transform infrared spectroscopy (ftir), and field emission scanning electron microscopy (fesem). the a...
The kinetics of fluctuations and switching of polarization in ferroelectrics, described by the Landau–Ginzburg Hamiltonian, is considered, based on a multi–dimensional Fokker–Planck equation. It describes the time evolution of the probability distribution function over the polarization field configurations in presence of a time–dependent external field. The Fokker–Planck equation in the Fourier...
In this research the Fourier transform of electric field in a three-layered model with thickness tj and dielectric erj is computed, after solving three dimensional Laplace equation for Fourier transform of potential under suitable boundary conditions.Then, by studying the behavior of spread function, a three-layered photoreceptor is designed. After designing and constructing of all of the subs...
The analysis of elastic wave propagation and scattering is an important issue in fields such as earthquake engineering, nondestructive testing, and exploration for energy resources. Since the 1980s, the boundary integral equation method has played an important role in the analysis of both forward and inverse scattering problems. For example, Colton and Kress (1998) presented a survey of a vast ...
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