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Search Results: 1 - 10 of 527355 matches for " M. D. Alharbi "
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Towards Understanding the Origins of Quantum Indeterminism and Non-Local Quantum Jumps  [PDF]
M. Sadiq, Fahad M. Alharbi
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.612208
Abstract: By Invoking symmetry principle, we present a self-consistent interpretation of the existing quantum theory which explains why our world is fundamentally indeterministic and that why non-local quantum jumps occur. Symmetry principle dictates that the concept of probability is more fundamental than the notion of the wave function in that the former can be derived directly from symmetries rather than have to be assumed as an additional axiom. It is argued that the notion of quantum probability and that of the wavefunction are intimately connected.
High Power Interleaved Boost Converter for Photovoltaic Applications  [PDF]
Ahmed A. Hafez, A. Y. Hatata, M. I. Alsubaihi, R. M. Alotaibi, F. T. Alqahtani, S. O. Alotaibi, A. M. Alhusayni, M. D. Alharbi
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.65001
Abstract: Interfacing DC sources to load/power grid requires DC converters that produce minimum level of current ripples. This is to limit the losses and hence increase the life span of these sources. This article proposes a simple inter-leaved boost converter that interfaces PhotoVoltaic (PV) module into a common DC-link. The article also addresses the faulty mode operation of the proposed circuit while advising the appropriate remedy actions. A MATLAB and Simulink dynamic platform are used to simulate the transient performance of the proposed converter. The results revealed the effectiveness and the viability of the proposed converter in reducing the ripples in the PV current without employing bulky input inductors or increasing the switching frequency.
On a Problem of an Infinite Plate with a Curvilinear Hole inside the Unit Circle  [PDF]
F. S. Bayones, B. M. Alharbi
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.61020
Abstract: In this work, we used the complex variable methods to derive the Goursat functions for the first and second fundamental problem of an infinite plate with a curvilinear hole C. The hole is mapped in the domain inside a unit circle by means of the rational mapping function. Many special cases are discussed and established of these functions. Also, many applications and examples are considered. The results indicate that the infinite plate with a curvilinear hole inside the unit circle is very pronounced.
High-Order Finite Difference Schemes for the First Derivative in Von Mises Coordinates  [PDF]
S. O. Alharbi, M. H. Hamdan
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.43059
Abstract: Third- and fourth-order accurate finite difference schemes for the first derivative of the square of the speed are developed, for both uniform and non-uniform grids, and applied in the study of a two-dimensional viscous fluid flow through an irregular domain. The von Mises transformation is used to transform the governing equations, and map the irregular domain onto a rectangular computational domain. Vorticity on the solid boundary is expressed in terms of the first partial derivative of the square of the speed of the flow in the computational domain, and the schemes are used to calculate the vorticity at the computational boundary grid points using up to five computational domain grid points. In all schemes developed, we study the effect of coordinate clustering on the computed results.
Optimization of Air Quality Monitoring Network Using GIS Based Interpolation Techniques  [PDF]
Mohammed M. Shareef, Tahir Husain, Badr Alharbi
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.76080
Abstract:

This paper proposes a simple method of optimizing Air Quality Monitoring Network (AQMN) using Geographical Information System (GIS), interpolation techniques and historical data. Existing air quality stations are systematically eliminated and the missing data are filled in using the most appropriate interpolation technique. The interpolated data are then compared with the observed data. Pre-defined performance measures root mean square error (RMSE), mean absolute percentage error (MAPE) and correlation coefficient (r) were used to check the accuracy of the interpolated data. An algorithm was developed in GIS environment and the process was simulated for several sets of measurements conducted in different locations in Riyadh, Saudi Arabia. This methodology proves to be useful to the decision makers to find optimal numbers of stations that are needed without compromising the coverage of the concentrations across the study area.

Ground-state atomic polarization relaxation-time measurement of Rb filled hypocycloidal core-shaped Kagome HC-PCF
T. D. Bradley,E. Ilinova,J. J. McFerran,J. Jouin,B. Debord,M. Alharbi,P. Thomas,F. Gerome,F. Benabid
Physics , 2015,
Abstract: We report on the measurement of ground state atomic polarization relaxation tile of Rb vapor confined in five different hypocycloidal core shape Kagome hollow core photonic crystal fibers made with uncoated silica glass. We are able to distinguish between wall-collision and transit-time effects in optical waveguide and deduce the contribution of the atom's dwell time at the core wall surface. In contrast with convetional macroscopic atomic cell configuration, and in agreement with Monte Carlo simulations, the measured relaxation times were found to be at least one order of magnitude longer than the limit set by the atom-wall collisional relaxation from thermal atoms. This extended relaxation time is explained by the combination of a stronger contribution of the slow atoms in the atomic polarization build-up, and of the relatively significant contribution of dwell time to the relaxation process of the ground state polarization.
The Development of Curriculum for Girls in Saudi Arabia  [PDF]
Fahad Alharbi
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.524226
Abstract: This paper illustrates the development of curriculum for girls in Saudi Arabia and how it has changed and been challenged over time. Several factors have played important roles on impeding girls’ education. Society was the main impediment, as it used to refuse any change and fight that change. Girls in Saudi Arabia are segregated from boys in different schools, but in the past, they also had to take different subjects and curriculum that what boys were studying. There are three major challenges that girls’ education faced until they were given the same quality of education that boys received. The first challenge started during King Faisal’s era when girls were allowed to go to public schools but under different directors than boys’ institutions. The second time was in 2002, when the girls’ education was moved under the Ministry of Education. The last challenge began with King Abdullah’s project for developing education, whereupon girls received the same quality of education as men.
Predefined Exponential Basis Set for Half-Bounded Multi Domain Spectral Method  [PDF]
Fahhad Alharbi
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.13019
Abstract: A non-orthogonal predefined exponential basis set is used to handle half-bounded domains in multi domain spectral method (MDSM). This approach works extremely well for real-valued semi-infinite differential problems. It spans simultaneously wide range of exponential decay rates with multi scaling and does not suffer from zero crossing. These two conditions are necessary for many physical problems. For comparison, the method is used to solve different problems and compared with analytical and published results. The comparison exhibits the strengths and accuracy of the presented basis set.
A GIS-Based Decision Support System for Reducing Air Ambulance Response Times: A Case Study on Public Schools in Jeddah City  [PDF]
Randa Alharbi
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.74030
Abstract: In injuries reducing ambulance response time (time from injury to hospital arrival) is an important factor for saving people’s lives. Helicopter emergency medical services can reduce out-of-hospital transport times because of their high speed and their ability to travel in straight pathsunlike ground ambulance which are restricted to road network paths, as well as the ability toaccess rural or remote area injuries that are difficult to reach by ground ambulance. GIS technology aids air ambulance movement planning to reduce out-of-hospital response time based on mathematical and geographic models to support decision making which is necessary from out-of-hospital care providers. The goal of this study is to use GIS to develop an efficient DSS to outline where air ambulance can reduce response times, by using spatial analysis tools to create Euclidean distance and direction zones around receiving hospitals. The study concludes that GIS technology can be used to develop an efficient DSS to outline where air ambulance can reduce response times, by creating surfaces of Euclidean allocation, direction, and distance that can be used to improve initial response times for the civil defense air rescue and air ambulance services.
Heat and Mass Transfer in MHD Visco-Elastic Fluid Flow through a Porous Medium over a Stretching Sheet with Chemical Reaction  [PDF]
Saleh M. Alharbi, Mohamed A. A. Bazid, Mahmoud S. El Gendy
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.16059
Abstract: This paper presents the study of convective heat and mass transfer characteristics of an incompressible MHD visco-elastic fluid flow immersed in a porous medium over a stretching sheet with chemical reaction and thermal stratification effects. The resultant governing boundary layer equations are highly non-linear and coupled form of partial differential equations, and they have been solved by using fourth order Runge-Kutta integration scheme with Newton Raphson shooting method. Numerical computations are carried out for the non-dimensional physical parameters. Here a numerical has been carried out to study the effect of different physical parameters such as visco-elasticity, permeability of the porous medium, magnetic field, Grashof number, Schmidt number, heat source parameter and chemical reaction parameter on the flow, heat and mass transfer characteristics.
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