Faculty Members researchs

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Modified electron acoustic field and energy applied to observation data Hesham Gomaa Mohammed Abdelwahed
Improved electrostatic acoustic field and energy have been debated in vortex trapped hot electrons and fluid of cold electrons with pressure term plasmas. The perturbed higher-order modified- Korteweg-de Vries equation (PhomKdV) has been worked out. The effect of trapping and electron temperatures on the electro-field and energy properties in auroral plasmas has been inspected. ...
On Time-Fractional Cylindrical Nonlinear Equation Hesham Gomaa Mohammed Abdelwahed
Properties of cylindrical electron acoustic solitons are studied in vortex plasmas. The modified cylindrical Korteweg–de Vries (KdV) equation is acquired and converted into the time fractional cylindrical modified KdV equation by Agrawal’s analysis. Via the Adomian decomposition method, a cylindrical soliton solution to the equation is obtained. The cylindrical time fractional effect on the wave properties is investigated. Further, the increase of the fractional order of time ...
Higher-Order Corrections to Earth's Ionosphere Shocks Hesham Gomaa Mohammed Abdelwahed
Nonlinear shock wave structures in unmagnetized collisionless viscous plasmas composed fluid of positive (negative) ions and nonthermally electron distribution are examined. For ion shock formation, a reductive perturbation technique applied to derive Burgers equation for lowest-order potential. As the shock amplitude decreasing or enlarging, its steepness and velocity deviate from Burger equation. Burgers type equation with higher order dissipation must be obtained to avoid this deviation. Solution for the compined two equations has been derived using renormalization analysis. Effects of higher-order, positive- negative mass ratio Q, electron nonthermal parameter δ and kinematic viscosities coefficient of positive (negative) ions η1 and η2 on the electrostatic shocks in Earth’s ionosphere are also argued. ...
On the ion acoustic obliquely propagation in magnetized inhomogeneous plasmas Hesham Gomaa Mohammed Abdelwahed

Inhomogeneous multi-component magnetized plasmas containing inertial ions, nonthermal electrons, and Boltzmannian positrons have been investigated theoretically. Variable coefficients Zakharov Kuznetsov (VZK) equation has been derived in a small amplitude limit. It is found that the propagation directions, positron parameters and magnetic field affected the properties of propagation of positive-negative solitary waves.

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A new approach for the evaluation of the effective electrode spacing in spherical ion chambers Mohammed Abd Elrahman Shqair

Ahmed M.Maghraby , MohammedShqair,  A new approach for the evaluation of th eeffective electrode spacing in spherical ion chambers. Nuclear Instruments and Methods in Physics Research A 834(2016)10–15

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Stabilization of heavy oil fly ash (HFO) for environmental and construction purposes Mazen Alshaaer
Power plants, such as Sha'iba and Rabigh, and water desalination plants are using HFO as fuel. The production of large amounts of fly ash from HFO is a serious environmental challenge in the Kingdom of Saudi Arabia. The major part of this FA (about 90–95 %) is dumped into landfills. Research of the characteristics and possible applications of HFO in Saudi Arabia is still insufficient in the scientific literature. Accordingly the main objective of the current research proposal is to investigate stabilization of fly ash generated at power, and desalination plants firing fuel oil, and to utilize the products for construction and other industrial applications. Production of new functional geopolymer cement using HFO as precursors will be investigated also. The products and cement will be subjected to physical and chemical characterization and analysis. ...
Development of functional geopolymer – based construction materials for passive cooling of buildings Mazen Alshaaer

Providing comfortable indoor conditions becomes problematic when outdoor temperature is high. The basic source of heat in a building is the sunlight energy absorbed through the roof, walls, windows as well as the heat generated by appliances and air leakages. Air-conditioning provides some relief. However, its initial cost as well as the related cost of electricity consumption make it an expensive technology to afford. In addition, conventional air conditioners use refrigerants containing chlorine compounds, which unfortunately contribute to depletion of the ozone layer and global warming. It is noteworthy that human production of greenhouse gases, especially CO2, is affecting the global climate. Statistics show that nearly 50% of CO2 emissions in developed countries are derived from energy consumption in buildings. Thus, it is obvious that well-designed and energy-efficient construction materials are prerequisite for low-energy-consumption as well as for a substantial reduction in CO2 emissions.

Our major aim in this research is to develop a new approach for green buildings in Saudi Arabia: thermal building behavior, exhibited by the coupling of using the pore structure and surface adsorbed water of a material as a passive cooling system, and production of geopolymer cement using local and low costresources at ambient temperature with low energy consumption. In residential buildings, the conventional air-conditioning systems tend to be noisy with unsightly protuberances on buildings, whilst passive cooling systems using porous building materials can be designed to enable high adsorbed water evaporation, during hot days. This proposal deals with the design of a sustainable passive evaporative...

Plasma Enhanced Polymer for Biocompatible and other Industrial Applications Essam Mohammed Abde-Fattah

The intent of the project is to develop a new functional materials based on plasma modification of polymer surface to use in several emerging novel application as a biocompatible material and/or improves the adhesion and wetability properties of polymer surface for other industrial applications.  The conditions of the plasma treatment, such as discharge voltage (power), exposure time, gas type/composition and chamber pressure that determine the nature and degree of the chemical modification of the polymer surface must be adjusted on the polymer type to minimize degradation and aging effects. Various types of polymer that have potential use  as biomedical compatible material, tissue engineering.  The biomedical studies will focus on the characterization of the blood coagulation and protein adhesion on the surface of treated polymer.  

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publications Essam Roshdy EL-Zahar

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The Published Papers Dr. Ashraf Elsayed Yehia
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