الفهرس | Only 14 pages are availabe for public view |
Abstract The thesis aims to study electromagnetic _elds with some di_erent appli- cations in wave motion. The thesis is consists of eight chapters, with a list of con- tents, a list of _gures, Arabic and English summaries, a list of publications, and a bibliography (References). In chapter one: Literature Review & Introduction In chapter one, we gave a survey of the literature relevant to this thesis as well as an introduction to some Electrodynamics topics. In chapter two: Far-_eld, ohmic heating, radiation resis- tance, temperature of Hertzian dipole antenna in lossless medium with momentum and energy ow in the far- zone A Far-_eld with calculation of intrinsic impedance, ohmic heating and antenna temperature of radiated ideal (Hertzian) dipole antenna have been discussed in free space and lossless background. Actually, there is great important to analysis the radiation resistance mechanism of a Hertzian dipole antenna in an in_nite isotropic lossless medium. We also discussed the momentum and energy ow in electromagnetic _elds with investigation that wavefront/phase velocity is equals to light speed in far zone. Typically, The thermal noise increase _ 130 K from the surrounding environment to temperature of the antenna. The temperature of lossless Hertzian antenna is equal to brightness temperature To. The results of this problem have been published in the ”JOURNAL OF ADVANCES IN PHYSICS”, 18, 2028. https://doi.org/10.24297/jap.v18i.8803 In chapter three: Electromagnetic non-Darcy Forchheimer ow and heat transfer over a nonlinearly stretching sheet of non-Newtonian uid in the presence of a non-uniform heat source This chapter focuses on the study of electromagnetic e_ects on a non- Newtonian uid that obeys the Casson model. Non-Darcy Forchheimer Cassson uid ow and heat transfer are considered over a non-linear stretch- ing sheet in the presence of a non-uniform heat source/generation. The governing foundational equations are _rst converted into a system of ordi- nary di_erential equations utilizing transformation of self-similarity and are then solved numerically by using Mathematica’s package for some physical parameter values. Signi_cant features of ow and heat transfer behaviors are presented and analyzed for various parameter values, especially for mag- netic and electric _elds. Numerical results for the velocity and temperature pro_les for the prescribed parameters are graphically represented as well as the local skin-friction coe_cient and local Nusselt number are displayed for speci_c parameters values to show interesting aspects of the numerical so- lution with the associated behaviors. It was found that, as the Forchheimer number F increases, the velocity decreases while the temperature increases. The temperature pro_le and the thermal boundary layer thickness decrease with increasing the electrical parameter. The results of this problem have been published in ”Solid State Technology” In chapter four: Cherenkov FEL reaction with plasma-_lled cylindrical waveguide in fractional D-dimensional space The possibility of generating an electromagnetic (EM) wave by a free- electron laser (FEL) beam from the Cherenkov device to control the cylin- drical waveguide’s _eld attenuation _lled with plasma has been investi- gated by analytical formalism. This new study sheds light on Cherenkov FEL beam interaction with electrons of inhomogeneous warm plasma to generate an electromagnetic wave in fractional dimensional space. The new analysis of traveling and standing waves in terms of Hankel and Bessel func- tions paves a way for introducing controlled EM wave propagation based on fractional D-dimensional space. It has been found that the Cherenkov FEL beam excites the EM wave and enhances the propagation of the elec- trical _eld through fractional dimensional space with propagation constant depending on Langmuir frequency. Within the plasma in the cylindrical waveguide, a TM mode emerges that contains spatial frequencies with a faster growth rate for traveling waves than standing waves. The results of this problem have been published in: IEEE Transactions on Plasma Science, vol. 49, no. 7, pp. 2070-2079, July 2021 In chapter Five: The e_ect of nanoparticles and electro- magnetic waves on Coronavirus (COVID-19) using a rectan- gular waveguide cavity resonator In this paper, the nanoparticles can be inserted into the bloodstream of an infected individual and bind to the coronavirus receptor using a Cavity, which is designed to pass electromagnetic (EM) wave propagation back and forth across its walls. At the cavity’s resonant frequency, which is also the frequency at which the response amplitude is greatest, standing waves form. The individual infected with the coronavirus is placed in the cavity, which has its electromagnetic wavelength adjusted to resonate with nanoparticles attached to coronavirus receptors. As a result, the heat generated by the resonant frequency of EM waves and nanoparticles attached to the coron-avirus will reduce the virus activity in an infected person. The results of this problem have been accepted for publication in: Advances in Mechanics In chapter Six: On study of fractal electromagnetic wave propagation in an inhomogeneous plasma using Caputo deriva- tive. Investigating of the electromagnetic (EM) wave propagation within an inhomogeneous plasma is discussed in both integer and fractional space. EM wave equation in terms of the fractional derivative of the Caputo type has been solved at di_erent values of fractional order . A new fractional wave equation of order 0 < 6 1 and 1 < 6 2 is used to describe the fractional plasma wave propagation. Moreover, the classical results are obtained at = 1. Four special cases for fractional order values have been discussed through some of _gures to show the behavior of the wave of plasma electrons. It is found that the analytical solutions are expressed in terms of the Mittag-Le_er function depending on the parameter and the patterns of the propagation relates with fractional wave frequency $2. The results of this problem are under review in: Progress In Electromagnetics Research In chapter Seven: Transient magnetic _eld behavior inside an atmospheric duct caused by a vertical magnetic dipole through the fractional space. This new study sheds light on behavior monitoring of transient elec- tromagnetic (EM) _eld inside an atmospheric duct (dielectric medium) through the fractional D-dimensional space by analytical formalism. A vertical magnetic dipole is located in the upper surface layer above the duct to be a source of the electromagnetic wave. The exact solution of the fractional EM equation is obtained in terms of Bessel and Mittage-Le_er functions based on Caputo fractional derivative order _ and the fractional D-dimensional space that include fractional Laplacian operator. The tran- sient magnetic _eld behavior inside the duct is plotted through some of _gures depending on D, _. The classical results in usual integer space are recovered from fractional solution. It is found that the amplitude of EM wave increases by increasing D and _ simultaneously, in general, the am- plitude of the propagated wave in the integer space is a higher than those in fractional space. The results of this problem are under review in: Applied Mathematics and Computation |