نتایج جستجو برای: transform domain

تعداد نتایج: 509603  

A. Sheikholeslami, M. A. Taghikhani, Z. Taghikhani,

This paper presents a new method for evaluation and simulation of inrush current in various transformers using operational matrices and Hartley transform. Unlike most of the previous works, time and frequency domain calculations are conducted simultaneously. Mathematical equations are first represented to compute the inrush current based on reiteration and then Hartley transform is used to stud...

Journal: :فیزیک زمین و فضا 0
احسان ذبیحی نائینی حمیدرضا سیاهکوهی

spectral decomposition is a powerful tool for analysis of seismic data. fourier transform determines the frequency contents of a signal. but for analysis of non-stationary signals, 1-d transform to frequency domain is not sufficient. in early years, transforming of seismic traces into time and frequency domain was done via windowed fourier transform, called a short time fourier transform (stft)...

Journal: :International Journal of Signal Processing, Image Processing and Pattern Recognition 2017

Journal: :IEEE Signal Processing Letters 2008

Journal: :journal of advances in computer research 2016
sedigheh ghofrani

ultrasound images suffer of multiplicative noise named speckle. different de-speckling algorithms run either in spatial domain or in transformed domain. in this paper, an adaptive filter in spatial domain according to assume the nakagami distribution as the statistic of log-compressed ultrasound images is used. for de-speckling in transformed domain, the non-sub sampled shearlet transform is us...

Journal: :نظریه تقریب و کاربرد های آن 0
khalid aboodh department of mathematics omdurman islamic university (http: //www. fst. oiu. edu. sd) sudan

here, a new method called aboodh transform homotopy perturbation method(athpm) is used to solve nonlinear partial di erential equations, we presenta reliable combination of homotopy perturbation method and aboodh transformto investigate some nonlinear partial di erential equations. the nonlinearterms can be handled by the use of homotopy perturbation method. the resultsshow the eciency of this...

Fundamental solutions of dynamic poroelasticity and generalized thermoelasticity are derived in the Laplace transform domain. For poroelasticity, these solutions define the solid displacement field and the fluid pressure in fluid-saturated media due to a point force in the solid and an injection of fluid in the pores. In addition, approximate fundamental solutions for short times are derived by...

Journal: :amirkabir international journal of modeling, identification, simulation & control 2014
s. s. nourazar a. mohammadzadeh m. nourazar

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...

Journal: :journal of oil, gas and petrochemical technology 0
kambiz razminia department of petroleum engineering, petroleum university of technology, ahwaz, iran abolhassan razminia dynamical systems & control (dsc) research lab., electrical engineering department, school of engineering, persian gulf university, p. o. box 75169, bushehr, iran zohrab dastkhan national iranian oil co., ahwaz, iran

this paper presents analytical solutions and simulations for pressure transient behavior of the partially penetrating wells (ppws). the newman’s product method was adopted to develop the basic instantaneous source functions which characterize the response of ppws. these results were obtained based on the solution of fully penetrating wells (fpws) and they were presented in laplace domain. furth...

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