Advances in Physics Theories and Applications
http://www.iiste.org/Journals/index.php/APTA
The International Institute for Science, Technology and Education (IISTE)en-USAdvances in Physics Theories and Applications2224-719XJournal Coverpage
http://www.iiste.org/Journals/index.php/APTA/article/view/37751
Journal CoverpageJournal Editor65Echo Cancelation Using Least Mean Square (LMS) Algorithm
http://www.iiste.org/Journals/index.php/APTA/article/view/37752
<p class="Default">The aim of this work is to investigate methods for restoring signals that are corrupted by one or more echos. Echo commonly occur over communication channels such as telephone and ADSL lines. A reasonable model of the echo process at the time domain has been proposed. The echo removal system is modeled as an FIR filter with an unknown impulse response. We estimate the required impulse response by transmitting a known signal x [n] over the channel and observing the corresponding output y[n]. We want a system that takes the echo signal y[n] as input, and outputs the original signal x[n].</p> <p class="Default"><strong>Keywords: </strong>Echo cancelation, FIR filter, Least Mean Square (LMS)</p>Samira A. Mahdi65Study the Lattice Distortion and Particle Size of One Phase of MnO by Using Fourier Analysis of X-ray Diffraction Lines
http://www.iiste.org/Journals/index.php/APTA/article/view/37753
<p>In this study, the Fourier analysis method was used for the analysis of the X-ray diffraction pattern of MnO (111), (200), (220), (311) and (222). The particle size of each X-ray line was calculated, the particle size of the manganese oxide was then calculated. The Fourier method was also used to calculate the mean square lattice strain of the manganese oxide and the results were as follows, where the particle size is equal to 7.9563 nm and the mean square strain equal to 0.3566 × 10<sup>-4</sup>. In order to determine the accuracy of the results of this method, other methods of analysis were used, such as the Debye - Scherrer method and Williamson–Hall method of analysis, and Modified Scherrer equation for calculating the particle size. The value of particle size and strain of these four methods was compared with the value of particle size and mean square strain of the Fourier method.</p> <p><strong>Keywords:</strong> Lattice Distortion, Particle Size, Fourier analysis, X-ray Diffraction Lines</p> <p> </p>Khalid Hellal HarbbiSarab Saadi Jahil65Application of Double Laplace Transform Decomposition Method on System of Partial Differential Equations
http://www.iiste.org/Journals/index.php/APTA/article/view/37754
<p>In this paper, the double Laplace transform decomposition method is used to find the exact solution of the system linear and nonlinear of partial differential equations subject to the initial conditions. Furthermore, two examples are illustrative to demonstrate the efficiency of the proposed method.</p> <p><strong>Keywords</strong><strong>:<em> </em></strong>initial Value Problem, Double Laplace Transform, Inverse Laplace Transform</p>Ghina Mubashar65Magneto Hydrodynamic Flow of Dissipative Non-Newtonian Fluid over an Exponential Stretching Surface with Thermal Radiation
http://www.iiste.org/Journals/index.php/APTA/article/view/37755
<p>Numerical investigation is carried out to analyze the flow, heat and mass transfer behavior of magnetohydrodynamic non-Newtonian fluid (Casson) over a stretched surface with thermal radiation, chemical reaction and viscous dissipation effects. The governing PDEs are transformed as ODEs with the help of suited similarity transform. The effective Matlab package bvp5c is used to obtain the numerical solutions of the transformed equations. The impact of pertinent parameters on the common profiles (flow, temperature and concentration) is discussed in detail with the assistance of graphical illustrations for Casson and Newtonian fluid cases. Tabular results are presented to explain the nature of the wall friction, local Nusselt and Sherwood numbers.</p> <p><strong>Key</strong><strong>w</strong><strong>ords</strong>: Magnetohydrodynamics; Radiation; Dissipation; Casson; Chemical reaction.</p>M. Sailaja65