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Search Results: 1 - 10 of 714453 matches for " M. A. Helal "
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The Characteristic Function Method and Its Application to (1 + 1)-Dimensional Dispersive Long Wave Equation  [PDF]
Medhat M. Helal, Mohammad L. Mekky, Emad A. Mohamed
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.31002
Abstract: In this paper, the characteristic function method is applied to seek traveling wave solutions of nonlinear partial differential equations in a unified way. We consider the Wu-Zhang equation (which describes (1 + 1)-dimensional disper-sive long wave). The equations governing the wave propagation consist of a pair of non linear partial differential equations. The characteristic function method reduces the system of nonlinear partial differential equations to a system of nonlinear ordinary differential equations which is solved via the shooting method, coupled with Rungekutta scheme. The results include kink-profile solitary wave solutions, periodic wave solutions and rational solutions. As an illustrative example, the properties of some soliton solutions for Wu-Zhang equation are shown by some figures.
UV/O3 Preirradiated Cotton Fabric-Containing Chitosan for Effective Removal of Heavy Metals  [PDF]
A. Hebeish, Kh. Elnagar, M. H. Helal, M. S. Ragab, M. F. Shaaban
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.510071
Abstract:
The present work aims at studying the effect of Ultra-Violet/Ozone (UV/O3) irradiation of cotton fabrics on their interaction with chitosan/citric acid based formulation and, the onset of this on the ability of treated fabrics to remove heavy metal ions from their aqueous solutions. To achieve the goal, the cotton fabrics were preirradiated for 90 minutes using UV/O3 as radiation source. The irradiated and the unirrdadiated cotton fabrics were submitted to finishing formulation consisting essentially of chitosan as a finishing agent and citric acid as crosslinking agent in combination with sodium hypophosphite (SHP) as a catalyst. Finishing formulation containing different concentrations of chitosan (0 - 4) along with citric acid (8 g/l) and SHP (4 g/l) were used and the interaction of chitosan with the cotton fabric was assessed through nitrogen measurement. The preirradiated and chemically finished fabrics vis-à-vis the unirrdadiated fabrics were examined for metal ion removal. Results conclude that the preirradiated cotton fabrics exhibit higher nitrogen content than the unirrdadiated fabrics. The same holds true for heavy metal removal, exemplified by Zn2+ and Cd2+ ions from their aqueous solutions. That is, preirradiated fabrics containing chitosan display higher percent heavy metal removal than their unirrdadiated mates.
A Similarity Technique for Solving Two-Layer Shallow-Water Equations  [PDF]
Magda M. Kassem, Medhat M. Helal, Mohammad L. Mekky, Emad A. Mohamed
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.34047
Abstract: This paper is devoted to the analysis of the two-layer shallow-water equations representing gravity currents. A similarity technique which is the characteristic function method is applied for this study. The application of the characteristic function method makes it possible to obtain the similarity forms depending on a group of infinitesimal transformations. Thus, the number of independent variables is reduced by one and the governing partial differential equations with the auxiliary conditions reduce to a system of ordinary differential equations with the appropriate auxiliary conditions. Numeric solutions are presented and discussed.
The Three Page Guide to the Most Important Results of M. S. El Naschie’s Research in E-Infinity Quantum Physics and Cosmology  [PDF]
M. A. Helal, L. Marek-Crnjac, Ji-Huan He
Open Journal of Microphysics (OJM) , 2013, DOI: 10.4236/ojm.2013.34020
Abstract:

In this short survey, we give a complete list of the most important results obtained by El Naschie’s E-infinity Cantorian space-time theory in the realm of quantum physics and cosmology. Special attention is paid to his recent result on dark energy and revising Einstein’s famous formula .

Letrozole versus Gonadotropin in Unexplained Infertile Couples Failed to Conceive with Clomiphene Citrate  [PDF]
Moustafa Abbas Ibrahaiem, Sherin A. Shazly, Khaled F. Helal, Hala Mowafy, Manal M. El Behery
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.410088
Abstract:

Background: Unexplained infertility represents about 15% - 20% of infertile couples. Usually, these cases need assistance. Clomiphene citrate is the most used drug for this problem but sometimes pregnancy failed to achieve it, so other options for assistance are gonadotrophin or letrezole. The objective of our study was to compare the pregnancy rate for letrezole and gonadotropin inunexplained infertile women’s who failed to conceive with clomiphene citrate. Methods: This prospective quasi-randomized trial was carried out in cytogenetic unite at obstetrics and gynecology department, Zagazig University Hospital. 140 infertile females were included, induction of ovulation by letrozole for half of them and by gonadotrophin for the other half. Results: There was statistically highly significant decrease in duration of stimulation, E2 levels and endometrial thickness at day of HCG in letrezole group, no significant difference between two groups as regard number of follicles and pregnancy rate per cycle, while the cumulative pregnancy rate and the cost of stimulation are significantly higher in gonadotrophin group. Conclusion: In patient with unexplained infertility who failed to conceive with clomiphene citrate, gonadotrophins have a higher pregnancy rate than letrezole. However, pregnancy rate was high enough with lower cost with letrezole to be acceptable and justified its use in this group of patients.

Elastic, electronic and optical properties of hypothetical SnNNi3 and CuNNi3 in comparison with superconducting ZnNNi3
M. A. Helal,A. K. M. A. Islam
Physics , 2011, DOI: 10.1016/j.physb.2011.09.018
Abstract: The elastic, electronic and optical properties of MNNi3 (M= Zn, Sn and Cu) have been calculated using the plane-wave ultrasoft pseudopotential technique which is based on the first-principles density functional theory (DFT) with generalized gradient approximation (GGA). The optimized lattice parameters, independent elastic constants (C11, C12, and C44), bulk modulus B, Compressibility K, shear modulus G, and Poisson's ratio \u{psion}, as well as the band structures, total and atom projected densities of states and finally the optical properties of MNNi3 have been evaluated and discussed. The electronic band structures of the two hypothetical compounds show metallic behavior just like the superconducting ZnNNi3. Using band structures, the origin of features that appear in different optical properties of all the three compounds have been discussed. The large reflectivity of the predicted compounds in the low energy region might be good candidate materials as a coating to avoid solar heating. Key words: MNNi3, Ab initio calculations, Elastic properties, Electronic band structure, Optical properties.
Role of Urokinase-Type Plasminogen Activator Receptors as an Early Detector for Treatment Outcome in Adult Acute Myeloid Leukemia in Egyptian Patients  [PDF]
Hanan R. Nassar, Eman Z. Kandeel, Laila A. E. Hegazy, Amany M. Helal, Tarek Darwish, Soad A. Eltokhy
Journal of Cancer Therapy (JCT) , 2015, DOI: 10.4236/jct.2015.611104
Abstract: Background: The urokinase-type plasminogen activator system which consists of a proteinase (the urokinase-type plasminogen activator, uPA), a receptor (the urokinase-type plasminogen activator receptor uPAR or CD87) and inhibitors (PAI1) is enriched in several types of tumors and involved in proteolysis, cell migration and invasion. High expression of uPA and uPAR is associated with an increased relapse rate and shorter survival in breast cancer and colorectal carcinomas. Aims: This study shed light on the expression of uPAR in adult acute myeloid leukemia (AML) and its prognostic relevance. Methods: Peripheral blood and bone marrow samples are obtained from 54 newly diagnosed AML adult patients, 20 healthy controls stained with anti CD87 and estimated on flow cytometry. Results: CD87 expression was heterogeneous in different FAB subtypes of AML with high expression in monocytic leukemia (M4/M5) (P value 0.001). High expression of CD87 was associated with shorter survival and poor response to therapy (P = 0.028, 0.002 respectively). The most discriminating cut off value of CD87 expression was 20%, patients with less than 20% expression had 4.6 times better treatment outcome than those with more than or equal to 20%. On the multivariate analysis, CD87 was the most significant single variable that affect treatment outcome compared to total leucocytic count, hemoglobin level, platelets count, cytogenetic and FLT expression. Summary/Conclusion: High CD87 expression is an independent prognostic parameter associated with poor response and shorter overall survival in adult AML patients.
On the Need for Fractal Logic in High Energy Quantum Physics  [PDF]
M. S. El Naschie, S. Olsen, J. H. He, S. Nada, L. Marek-Crnjac, A. Helal
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2012, DOI: 10.4236/ijmnta.2012.13012
Abstract: Modern advances in pure mathematics and particularly in transfinite set theory have introduced into the fundamentals of theoretical physics many novel concepts and devices such as fractal quasi manifolds with non-integer (Hausdorff) dimension for its geometry as well as infinite dimensional wild topology and non classical fuzzy logic. In the present work transfinite fractal sets and fuzzy logic are combined to enable the introduction of a new theory termed fractal logic to the foundation of high energy particle physics. This leads naturally to a new look at quantum gravity. In particular we will show that to understand and develop quantum gravity we have to bring various fields together, particularly fractals and nonlinear dynamics as well as sphere packing, fuzzy set theory, number theory and quantum entanglement and irrationally q-deformed algebra.
Modeling Approach for Determining Equivalent Optical Constants of Plastic Shading Nets under Solar Radiation Conditions
A. M. Abdel-Ghany,I. M. Al-Helal
Advances in Materials Science and Engineering , 2012, DOI: 10.1155/2012/158067
Abstract: The radiative properties of several plastic shading nets were measured under natural solar radiation conditions. We found that the plastic nets behave as homogeneous translucent materials (e.g., plastic film, plastic sheets, and glass). Based on this behavior, we suggest that it is possible to treat plastic nets as translucent materials and to characterize them with equivalent optical constants (i.e., equivalent refractive indexes, eq, and equivalent extinction coefficients, eq). Here a physical model to determine eq and eq of plastic nets was described in analogy to homogeneous translucent materials. We examined three groups of nets based on their color (black, black-green, and beige). Each group consisted of nets with four or five different porosities. Nets of each group had almost the same texture structure. For each group, we derived an equation for eq as a function of the net porosity and determined an average value for eq. Once values of eq and eq were determined, the solar radiative properties of a net could then be calculated from eq and eq for any incident angle of solar beam radiation without the need of measurements. The present model was validated by comparing the calculated with the measured radiative properties of three nets at different incident angle of solar beam radiation. The calculated radiative properties reasonably agreed with measured values.
In vitro Antibacterial Screening of the Metabolite of a Monocillium Species Isolated from a Soil Sample of Bangladesh
M. Helal Uddin Biswas,A. R. M. Ruhul Amin,M. Shah Alam Bhuiyan,M. A. Rashid
Journal of Medical Sciences , 2001,
Abstract: A Monocillium species isolated from a soil sample which grown optimally in Czapek`s dox broth (acidic) medium yielded the metabolic compound HB identified as a mixture of novel compounds, Monocillinols A and B. Antibacterial activities of the compound were observed against fifteen Gram positive and Gram negative pathogenic organisms. The compound showed significant antibacterial activities against all pathogenic organisms tested except Gram negative Shigella sonnei. The minimum inhibitory concentration (MIC) values of the compound were determined against Bacillus subtilis, Sarcina lutea, Staphylococcus aureus, Shigella dysenteriae, Escherichia coli and Salmonella typhi and found to be 128, 256, 128, 128, 128 and 128 g/ml, respectively.
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