Cairo, Egypt
Cairo, Egypt

Banha University is an Egyptian university in the Egyptian city of Banha, the capital of Al Qalyubiyah governorate.It was established according to a decree in 25 November 1976 as a branch from Zagazig University in Banha, with the faculties of Commerce, Education, Agriculture of Moshtohor, Engineering of Shobra and Medicine.In 1981–1982, the faculties of Arts, Science of Banha and Veterinary Medicine of Moshtohor were founded. On 1 August 2005 it became an independent university from Zagazig University. The previous president of the university is Professor Hosam-ed-din Mohammad Al-Attar and then professor Mohamed Safwat Zahran, now Professor Ali Shams Aldeen. Wikipedia.

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Farag Ali A.,Center for Fundamental Physics | Farag Ali A.,Benha University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

An emergence of cosmic space has been suggested by Padmanabhan in [1]. This new interesting approach argues that the expansion of the universe is due to the difference between the number of degrees of freedom on a holographic surface and the one in the emerged bulk. In this paper, we derive, using emergence of cosmic space framework, the general dynamical equation of FRW universe filled with a perfect fluid by considering a generic form of the entropy as a function of area. Our derivation is considered as a generalization of emergence of cosmic space with a general form of entropy. We apply our equation with higher dimensional spacetime and derive modified Friedmann equation in Gauss-Bonnet gravity. We then apply our derived equation with the corrected entropy-area law that follows from Generalized Uncertainty Principle (GUP) and derive a modified Friedmann equations due to the GUP. We then derive the modified Raychaudhuri equation due to GUP in emergence of cosmic space framework and investigate it using fixed point method. Studying this modified Raychaudhuri equation leads to nonsingular solutions which may resolve singularities in FRW universe. © 2014 The Author.

Farag Ali A.,Center for Fundamental Physics | Farag Ali A.,Benha University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

In this work, we investigate black hole (BH) physics in the context of the gravity rainbow. We investigate this through rainbow functions that have been proposed by Amelino-Camelia [Living Rev. Relativity 16, 5 (2013)] and Amelino-Camelia et al. in [Int. J. Mod. Phys. A 12, 607 (1997)]. This modification will give corrections to both the temperature and the entropy of BHs, and hence it changes the picture of Hawking radiation greatly when the size of the BH approaches the Planck scale. It prevents the BH from total evaporation, predicting the existence of a BH remnant, which may resolve the catastrophic behavior of Hawking radiation as the BH mass approaches zero. © 2014 American Physical Society.

Uniform cobalt carbonate nanopowders were synthesized through free-surfactant hydrothermal treatment of a mixture of cobalt acetate and ammonium carbonate in an autoclave. The size, phase and purity of CoCO 3 particles were controlled by adjusting reaction time (05-24 h), temperature (80-160°C), and (1:6-1:0.5) (Co2+:CO3 2-) molar ratios. Pure cobalt carbonate nanoparticles were obtained in high yield (94%) at 120 °C for 0.5 h, with (1:3) (Co2+:CO 3 2-) molar ratio and crystallite size in ranges 80-90 nm. Moreover, cobalt oxide nanoparticles with an average crystallite size of 25 nm have been obtained by thermal decomposition of cobalt carbonate microspheres at 300 °C for 2 h. Chemical structure of the products was confirmed by powder X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). Morphology of the products was investigated by transmission electron microscope (TEM) and scanning electron microscope (SEM). Optical properties of Co3O 4 nanoparticles revealed the presence of two band gaps (2.0 and 1.46 eV) whose values confirm the purity and semiconducting properties of the oxide. © 2012 Elsevier B.V.

Objective: To evaluate the effect of laparoscopic ovarian drilling (LOD) on plasma levels of anti-Müllerian hormone (AMH) and ovarian stromal blood flow changes, by using three-dimensional power Doppler ultrasonography, in polycystic ovary syndrome (PCOS). Design: Prospective controlled study. Setting: Taiba hospital, Kuwait. Patient(s): Twenty-three anovulatory clomiphene citrate (CC)-resistant women with PCOS and 20 fertile women as a control group. Intervention(s): Laparoscopic ovarian drilling. Mean Outcome Measure(s): Serum levels of AMH, ovarian three-dimensional power Doppler indices (vascularization index, flow index, and vascularization flow index) and occurrence of ovulation or pregnancy. Result(s): Plasma AMH and power Doppler indices of ovarian stromal blood flow were significantly higher in the PCOS group than in the control group. Plasma AMH and ovarian stromal blood flow Doppler indices were significantly reduced in the PCOS group after LOD. Women who ovulated after LOD had a significantly lower preoperative AMH compared with the nonresponders. There was a significant positive correlation between AMH and power Doppler flow indices before and after LOD in PCOS group. Conclusion(s): Measuring AMH and ovarian stromal three-dimensional power Doppler blood flow for women with anovulatory PCOS undergoing LOD may provide a useful tool in evaluating the outcome of LOD. © 2011 by American Society for Reproductive Medicine.

Mahmoud T.S.,Benha University
Surface and Coatings Technology | Year: 2013

In the present investigation, surface modification of A390 hypereutectic cast Al-Si alloys using friction stir processing (FSP) was conducted. The effect of the tool rotational and traverse speeds as well as the number of passes on the microstructural, mechanical and tribological characteristics of the modified surfaces was investigated. The results showed that FSP significantly improved the microstructure of the as-cast A390 Al-Si alloy by eliminating the porosity and refining both the α-Al grains and the Si particulates. The as-cast A390 alloy exhibited mean size and aspect ratio of Si particulates of about 59 ± 24. μm and 3.56 ± 1.9, respectively. FSP significantly reduced both the mean size and aspect ratio of the Si particulates. The mean size of the Si particles increases with increasing the tool rotational and/or reducing the tool traverse speeds, but reduced by increasing the number of passes. Samples of friction stir (FS) processed at 1200. rpm, 20. mm/min and three passes exhibited the minimum mean size (4.39 ± 1.9. μm) and aspect ratio (1.18 ± 0.4) of the Si particulates. The FS-processed regions exhibited less scattered and higher hardness values than the as-cast A390 alloy. The as-cast A390 alloy exhibited highly scattered hardness values between 62.5 and 94.6 VHN. Samples FS-processed at 1200. rpm, 20. mm/min and three passes exhibited the maximum hardness values between 114.66 and 119.34 VHN. The mean hardness of the stirred zones increases with increasing the tool traverse speed and the number of passes, while decreases with increasing the tool rotational speed. The FS-processed samples exhibited lower wear rates and coefficient of frictions than the as-cast A390 alloy. Both the wear rates and the coefficient of frictions were found to be reduced by reducing the tool rotational speed and/or increasing the tool traverse speed. Increasing the number of passes reduces the wear rate as well as the coefficient of friction. © 2013 Elsevier B.V.

El-Sayed G.O.,Benha University
Desalination | Year: 2011

The ability of palm kernel fiber (PKF) to adsorb methylene blue (MB) and crystal violet (CV) from aqueous solutions has been studied. Adsorption studies were carried out at different initial dye concentrations (20, 40, 80 and 160mg/L), contact time, pH (1.0-11.0) and sorbent doses (0.4, 2.0, 4.0 and 8.0g/L). Other factors affecting the absorption process as stirring rate, ionic strength and temperature of the initial dye solution were also examined. Adsorption data were modeled using Langmuir, Freundlich and Temkin adsorption isotherms. Equilibrium data of the biosorption process fitted very well to the Freundlich model (R2=0.997 and 0.991 for MB and CV, respectively). The thermodynamic parameters such as δH°, δS° and δG° were evaluated. The dye adsorption process was found to be endothermic for the two dyes. The maximum adsorption capacity Qo was 95.4mg/g for MB and 78.9mg/g for CV at an optimum pH. Adsorption kinetic was verified by pseudo-first-order and pseudo-second-order models. The results indicated that the dye uptake process followed the pseudo second-order and saturation type rate expressions for each dye. © 2011 Elsevier B.V.

Ali A.F.,Benha University
Journal of High Energy Physics | Year: 2012

We investigate the impact of the Generalized Uncertainty Principle (GUP), proposed by some approaches to quantum gravity such as String Theory and Doubly Special Relativity Theories (DSR) on the production of mini black holes, and show that the minimum black hole mass is formed at energies higher than the energy scales of LHC which possibly agrees with the recent experimental results of LHC [1, 2]. © SISSA 2012.

Nickel ferrite (NiFe2O4) nanoparticles were prepared using sol-gel technique; while Polyaniline (PANI)/NiFe2O4 nanocomposites were synthesized via chemical oxidative polymerization of aniline monomer (ANI) in the presence of various ferrite amounts (nickel ferrite/ANI = 2.5, 5, 25 and 50 wt%). The morphology, structure, magnetic, electrical and microwave absorption properties of ferrite powders and nanocomposites were characterized by Fourier transform infrared (FTIR), powder X-ray diffraction (XRD), UV-vis absorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), four-point probe resistivity instrument and vector network analyzer. The crystalline size of nickel ferrite was found in the range of 23-27 nm. The results of TGA, FTIR and UV-vis spectra indicated that nickel ferrite particles improved the thermal stability of composite, and there were interactions between ferrite particles and PANI. The nanocomposites under applied magnetic field exhibited the hysteresis loops of ferromagnetic nature at room temperature. The conductivity of all measured samples decreased with decreasing temperature, exhibiting typical semiconductor behavior. The microwave absorbing properties of the nickel ferrite and composite specimens with the coating thickness of 2 mm were investigated using waveguide method in the frequency range of 1-6 GHz. The results showed a microwave absorption band with frequency shifts to the higher frequency region with the increase in PANI content. The maximum reflection loss reaches -12.5 dB at 2.5 GHz for the nickel ferrite and -20.3 dB at 3.78 GHz for the composite containing 95 wt% aniline. The electronic and magnetic properties of the nanocomposites are tailored by controlling the ferrite content. © 2014 Elsevier B.V.

Hogo M.A.,Benha University
Expert Systems with Applications | Year: 2010

This paper introduces a hybridization approach of AI techniques and statistical tools to evaluate and adapt the e-learning systems including e-learners. Learner's profile plays a crucial role in the evaluation process and the recommendations to improve the e-learning process. This work classifies the learners into specific categories based on the learner's profiles; the learners' classes named as regular, workers, casual, bad, and absent. The work extracted the statistical usage patterns that give a clear map describing the data and helping in constructing the e-learning system. The work tries to find the answers of the question how to return the bad students who are away back to be regular ones and find a method to evaluate the e-learners as well as to adapt the content and structure of the e-learning system. The work introduces the application of different fuzzy clustering techniques (FCM and KFCM) to find the learners profiles. Different phases of the work are presented. Analysis of the results and comparison: There is a match with a 78% with the real world behavior and the fuzzy clustering reflects the learners' behavior perfectly. Comparison between FCM and KFCM proved that the KFCM is much better than FCM. © 2010 Elsevier Ltd. All rights reserved.

Moawed M.,Benha University
Energy Conversion and Management | Year: 2011

The forced convection from outside surfaces of helical coiled tubes is studied experimentally with a constant wall heat flux. Ten helical coiled-tubes of different parameters with a range of diameter ratio (D/do) ranged from 7.086 to 16.142 and pitch ratio (P/do) ranged from 1.81 to 3.205 are employed in the present study. The experiments are performed in an open-circuit airflow wind tunnel system operated in suction mode. The experiments covered a range of Reynolds number (Re) of 6.6 × 10 2 to 2.3 × 103. The experimental results indicated that these parameters (D/do and P/do) have important effects on the average heat transfer coefficient. The average Nusselt number (Num) increases with the increase of D/do at constant Re and P/do. Also, Num increases with the increase of P/do at constant Re and D/do. A considerable agreement between the present experimental data and previous work is achieved. The average Nusselt numbers is correlated with Re, D/do and P/do. © 2010 Elsevier Ltd. All rights reserved.

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