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Search Results: 1 - 10 of 402240 matches for " Hussein M. Harbi "
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MASW Survey with Fixed Receiver Geometry and CMP Cross-Correlation Technique for Data Processing: A Case Study of Wadi Fatima, Western Saudi Arabia  [PDF]
Faisal Rehman, Sherif M. El-Hady, Muhammad Faisal, Hussein M. Harbi, Muhammad Fahad Ullah, Saifur Rehman, Muhammad Kashif
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.85027
Abstract: Multichannel analysis of surface waves is a noninvasive technique for subsurface shear wave velocity imagining. This method is one of the most effective geophysical tools for geotechnical investigations. In this paper, we present multichannel surface wave data acquisition in a non-conventional manner in alluvium deposits. Fixed receiver and multi-source offset geometry were applied to obtain field data. The data processing comprised of generating CMP cross-correlated traces and then inversion to obtain dispersion curves. The inversion of dispersion curves is achieved by employing a genetic algorithm to obtain subsurface shear wave velocity. Finally, the one-dimensional shear wave models are obtained. The multi-source offset data acquisition with fixed receiver geometry technique in combination with CMP cross-correlation gathers for data processing worked in a quite efficient way to obtain subsurface shear wave model.
Self-Similar Solution of Heat and Mass Transfer of Unsteady Mixed Convection Flow on a Rotating Cone Embedded in a Porous Medium Saturated with a Rotating Fluid  [PDF]
Saleh M. Al-Harbi
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.210166
Abstract: A self-similar solution of unsteady mixed convection flow on a rotating cone embedded in a porous medium saturated with a rotating fluid in the presence of the first and second orders resistances has been obtained. It has been shown that a self-similar solution is possible when the free stream angular velocity and the angular velocity of the cone vary inversely as a linear function of time. The system of ordinary differential equations governing the flow has been solved numerically using an implicit finite difference scheme in combination with the quasi-linearization technique. Both prescribe wall temperature and prescribed heat flux conditions are considered. Numerical results are reported for the skin friction coefficients, Nusselt number and Sherwood number. The effect of various parameters on the velocity, temperature and concentration profiles are also presented here.
Crystallization Kinetics of Melt-Blended Low-Density Phthalic Anhydride with a Low-Tg Tin-Phosphate  [PDF]
Laila M. Al-Harbi
Open Journal of Polymer Chemistry (OJPChem) , 2014, DOI: 10.4236/ojpchem.2014.43005
Abstract:

Polyamide prepared by the reaction of ethylene diamine with different ratios between 1,6-glyconic acid and phthalic anhydride. The differential scanning calorimetry (DSC) is used to study the nonisothermal and isothermal crystallization of low density polyamides in phosphate glass (Pglass)-polymer hybrid blends. The % crystallinity decreased as the Pglass volume increased. The half-life (t1/2) for crystallization decreased as the propagation rate constant rose for both the polymer matrices with increasing Pglass concentrations. The results show that the Pglass is improved nucleating agent for formation of the Pglass-polymer hybrids up to 35% Pglass and the energy necessary to break decreased. The stability of the reaction of ethylene diamine with phthalic anhydride and glyconic acid was qualitatively investigated using molecular orbital calculations.

Thermodynamic Treatment of High Energy Heavy Ion Collision
Wedad AL-Harbi,Tarek Hussein
Physics , 2013, DOI: 10.5506/APhysPolB.44.1001
Abstract: The hadron production in heavy ion collision is treated in the framework of thermodynamic vision. Thermodynamic system formed during central collision of Pb-Pb at high energies is considered, through which binary collision is assumed among the valance quarks. The partition function of the system is calculated; accordingly the free available energy, the entropy and the chemical potential are calculated. The concept of string fragmentation and defragmentation are used to form the newly produced particles. The average multiplicity of the newly produced particles are calculated and compared with the recent experimental results.
Maximum Norm Analysis of a Nonmatching Grids Method for Nonlinear Elliptic PDES
A. Harbi,M. Boulbrachene
Journal of Applied Mathematics , 2011, DOI: 10.1155/2011/605140
Abstract: We provide a maximum norm analysis of a finite element Schwarz alternating method for a nonlinear elliptic PDE on two overlapping subdomains with nonmatching grids. We consider a domain which is the union of two overlapping subdomains where each subdomain has its own independently generated grid. The two meshes being mutually independent on the overlap region, a triangle belonging to one triangulation does not necessarily belong to the other one. Under a Lipschitz asssumption on the nonlinearity, we establish, on each subdomain, an optimal error estimate between the discrete Schwarz sequence and the exact solution of the PDE. 1. Introduction The Schwarz alternating method can be used to solve elliptic boundary value problems on domains which consist of two or more overlapping subdomains. The solution is approximated by an infinite sequence of functions which results from solving a sequence of elliptic boundary value problems in each of the subdomains. Extensive analysis of Schwarz alternating method for nonlinear elliptic boundary value problems can be found in ([1–4] and the references therein). Also the effectiveness of Schwarz methods for these problems, especially those in fluid mechanics, has been demonstrated in many papers. See proceedings of the annual domain decomposition conference beginning with [5]. In this paper, we are interested in the error analysis in the maximum norm for a class of nonlinear elliptic problems in the context of overlapping nonmatching grids: we consider a domain which is the union of two overlapping subdomains where each subdomain has its own triangulation. This kind of discretizations are very interesting as they can be applied to solve many practical problems which cannot be handled by global discretizations. They are earning particular attention of computational experts and engineers as they allow the choice of different mesh sizes and different orders of approximate polynomials in different subdomains according to the different properties of the solution and different requirements of the practical problems. Quite a few works on maximum norm error analysis of overlapping nonmatching grids methods for elliptic problems are known in the literature (cf., e.g., [6–9]). To prove the main result of this paper, we proceed as in [7]. More precisely, we develop an approach which combines a geometrical convergence result due to Lions [2] and a lemma which consists of estimating the error in the maximum norm between the continuous and discrete Schwarz iterates. The optimal convergence order is then derived making use of
Essential Trace Elements in Hair and Nail Samples of Iranian Malnourished Children
M Raei,S Harbi
Iranian Journal of Pediatrics , 1996,
Abstract:
The Charge Structure of the Nucleons  [PDF]
M. Y. Hussein
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.812115
Abstract: Study of nucleons charge radii and electromagnetic form factors are expected to provide valuable information about the distribution of electric charge within the fundamental particles in nucleon’s inner structure. In the recent years, dramatic progress has been made in the understanding of the nucleon structure and the precision of its partonic content, due to the vast theoretical progress, and the availability of new high precision measurements. Here in this article, we present a simple model for the charge structure of the nucleons and the most available sets of the structure functions to calculate the mean square charge radius N2> for both protons and neutrons. Our results are consistent with the modern understanding of the nucleons as well as recent experimental data. We discuss the origin of the sign <rN2> for both proton and neutron.
Tissue-specific isoenzyme variations in Arabian camel, Camelus dromedaries  [PDF]
Mohammed S. AL-Harbi, Sayed A. M. Amer
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.37107
Abstract: Malate dehydrogenase, α-esterase and β-esterase isoenzymes have been analyzed by native polyacryla-mide gel electrophoresis in different tissues (liver, kidney, muscle and hump) of the Arabian Camel, Camelus dromedaries in order to study the tissue specificity of these isoenzymes. Malate dehy-drogenase recorded three fractions while both este-rases recorded two fractions in different studied tissues. Malate dehydrogenase was considered as a key isoenzyme in discriminating among the different studied tissues. The percentage amount of both Mdh-1 and Mdh-2 showed significant difference among the different tissues while Mdh-3 recorded significant variation between muscle and hump tissues. The significant variation in the amount of Mdh isoenzyme (on the level of either total or fractions) among the different studied tissues may reflect the role of this enzyme for energy production in this desert animal. With respect to esterases, the percentage amount for both fractions and the total enzyme did not show significant difference among different tissues except β-Est-2 which was significantly higher in hump than in muscle. This enzyme showed higher thickness and intensity in both liver and kidney than in the muscle and hump indicating its greater activity in both liver and kidney.
Comparison of energy-related isoenzymes between production and racing Arabian camels  [PDF]
Mohammed S. AL-Harbi, Sayed A. M. Amer
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.38138
Abstract: Native polyacrylamide gel electrophoresis have been applied for the analyses of alkaline phosphatase (ALP), malate dehydrogenase (Mdh) and malic (ME) isoenzymes in Arabian camel for racing and production. Two fractions for each of these isoenzymes have been recorded in the studied breeds. ALP showed very weak patterns without remarkable difference between the two breeds and this is an indication to that the samples used were healthy and being from the same age. The cytosolic Mdh-1 and ME-1 have been recorded in both camel breeds with high intensity. The mitochondrial Mdh-2 and ME-2 have been recorded with small intensity in production breeds commonly. The present data indicate the necessity of the mitochondrialMdh-2 for energy production in racing breed and the responsibility of the cytosolic Mdh-1 for lipogenesis and energy production in both breeds. We therefore may assume that the appearance of both Mdh forms is necessary for both energy and lipid production in the production breeds while Mdh-1 was useful as bioenergetic enzyme necessary for racing. The different expressions are indications of the difference in the physiological adaptations of both camel breeds and are not for a systematic value.
Selenium Nanoparticles Ameliorative Effect on Acetaminophen Hepatotoxicity in Male Mice  [PDF]
Mohammad S. AL-Harbi, Sayed A. M. Amer
Natural Science (NS) , 2017, DOI: 10.4236/ns.2017.97020
Abstract: Selenium nanoparticles (SeNPs) have been widely used as anti-inflammatory and anti-toxic agent. The present study used Bacillus tequilensis for biosynthesizing SeNPs from sodium selenite (Na2SeO3) and investigated its ameliorative effects on acetaminophen (APAP) hepatotoxicity in male mice. The results indicated that Alanine transaminase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP) significantly elevated in mice treated with APAP, while other liver markers (total proteins and albumin) did not change. SeNPs either alone or in combination with APAP showed ameliorative effects on liver enzymes to some extents where their activities decreased to be insignificant with those of normal group. A slight variation was shown in total antioxidant capacity (TAC). Histopathologically, the hepatocytes of the mice treated with APAP showed cloudy swelling and vacuolar degeneration, while those treated with SeNPs or both SeNPs and APAP appeared more or less histologically normal. In conclusion, SeNPs can be used to improve or replace today’s therapies of APAP hepatotoxicity.
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