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Jīzān, Saudi Arabia

Zaki M.F.,Egypt Atomic Energy Authority | Zaki M.F.,Jizan University
International Journal of Engineering Research in Africa | Year: 2016

In this paper, low-density polyethylene (LDPE) was irradiated by argon ion with different fluences up to 1015 ions/cm2. The optical, chemical and mechanical properties have been investigated using UV-Vis spectroscopy, FTIR and Micro-indentation tester, respectively. The results showed the ion beam bombardment induced decreases in the transmittance of the irradiated polymer samples. This change in transmittance can be attributed to formation of conjugated bonds i.e. possible formation of defects and/or carbon clusters. The indirect optical band gap decreased from 3.0 eV for pristine sample to 2.3 eV for that sample irradiated with the highest fluence of Ar ion beam. Furthermore, the number of carbon atoms and clusters increased with increasing the Ar ion fluences. FTIR spectra showed changes in the chemical properties of the bombarded polymer samples. Argon ion beam inducing increasing in the Vicker's micro-indentation, which may be attributed to the increase in the carbon concentration on the irradiated surface samples and crosslinking effects in the irradiated polyethylene chains. © 2016 Trans Tech Publications, Switzerland.


Oshaba A.S.,Electronics Research Institute of Egypt | Oshaba A.S.,Jizan University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

High speed Switched Reluctance Motors (SRMs) have recently been gaining attention as contenders in many variable speed drive applications. This has also been stimulated by recent advances in power electronic technology which enables this drive system for many applications such as high speed water pump and space and military applications. This study presents the design and control of high speed four phases SRM suitable for high speed water pumping and other high speed variable load applications. The dynamic load characteristic and the SRM operation modes have been studied and a novel cascade control strategy is designed and implemented using the MathLap Simulink. The SRM drive system is tested and encouraging results were obtained. The results are of prime importance in the developments of rural and remote areas and also for space and military applications. © Maxwell Scientific Organization, 2013.


Mohamed S.F.,National Research Center of Egypt | Agili F.,Jizan University | Asker M.M.,National Research Center of Egypt | El Shebawy K.,National Research Center of Egypt
Monatshefte fur Chemie | Year: 2011

Turbinaria decurrens immobilized in sodium alginate showed increasing intraparticular diffusion of lead, stability of the metal binding, and affinity for lead. Equilibrium lead concentrations were attained after 9 h. The maximum lead uptakes were 1.14, 1.35, and 1.79 mmol g-1, respectively, for alginate xerogels, free alga, and immobilized alga. The order of maximum lead uptake for different.biosorbents was immobilized alga[free alga[alginate xerogels. Scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis showed a uniform distribution of lead on the alginate surface. Fourier transform infrared spectroscopy (FTIR) showed that the main bands modified after lead uptake were those corresponding to hydroxyl and carboxyl stretching. The immobilized beads could be repeatedly used with high efficiency. T. decurrens immobilized in alginate xerogels constitutes an excellent biosorbent for lead, sometimes surpassing the biosorption performance of alginate alone and even the free alga. © 2011 Springer-Verlag.


Zaki M.F.,Egypt Atomic Energy Authority | Zaki M.F.,Jizan University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2016

In this paper, low-density polyethylene (LDPE) was irradiated by argon ion with different fluences up to 1015ions/cm2. The optical, chemical and hardness properties have been investigated using UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and micro-indentation tester, respectively. The results showed the ion beam bombardment induced decreases in the transmittance of the irradiated polymer samples. This change in transmittance can be attributed to the formation of conjugated bonds i.e. possible formation of defects and/or carbon clusters. The indirect optical band gap decreased from 3.0 eV for the pristine sample to 2.3 eV for that sample irradiated with the highest fluence of the Ar ion beam. Furthermore, the number of carbon atoms and clusters increased with increasing Ar ion fluences. FTIR spectra showed the formation of new bands of the bombarded polymer samples. Furthermore, polar groups were created on the surface of the irradiated samples which refer to the increase of the hydrophilic nature of the surface of the irradiated samples. The Vicker's hardness increased from 4.9 MPa for the pristine sample to 17.9 MPa for those bombarded at the highest fluence. This increase is attributed to the increase in the crosslinking and alterations of the bombarded surface into hydrogenated amorphous carbon, which improves the hardness of the irradiated samples. The bombarded LDPE surfaces may be used in special applications to the field of the micro-electronic devices and shock absorbers. © 2016 Elsevier B.V. All rights reserved.


Arab S.,King Abdulaziz University | Alshikh A.,Jizan University
Life Science Journal | Year: 2010

A novel sensor was developed for simultaneous detection of Pb, Cd, Cu and Zn concentration based on the differential pulse anodic stripping voltammetry techniques. Response (DPSV) performed on a hanging mercury drop electrode (HMDE). The estimation of Pb, Cd, Cu, Zn concentration in the mineral water of Al - Qasim, Hana Al Qasim, Najran, Nova, Safa Makah, and Mozn Jazan drinking water in the Kingdom of Saudi Arabia was accomplished.

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