Lifton V.A.,Evonik Industries |
Tontrup C.,Evonik Industries |
von Rymon Lipinski T.,Institute of Applied Technology
Proceedings of the Unified International Technical Conference on Refractories, UNITECR 2013 | Year: 2014
A binder for cement- and silica-free castables based on aqueous dispersion of nanostructured alumina powder is described. The binder, VP Disp W 450 XC, is characterized by high solids content of 50 wt. %, long-term stability at neutral to alkaline pH values and only trace amounts of sodium, which improves its use in high temperature applications. We show that Hot Crushing Strength of refractory alumina castables achieved with this binder is approx. 40% higher than HCC of alumina castables made with the sodium-containing binder. We demonstrate that sodium-free stabilization of the binder does not lead to degradation of other mechanical properties of the castables. © 2014 The American Ceramic Society.
El-Menyawy E.M.,National Research Center of Egypt |
Abu El-Enein R.A.N.,Institute of Applied Technology
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013
3-Amino-2-(2-nitrophenyl)diazinyl-3-(morpholin-1-yl)acrylonitrile (ANMA) has been successfully synthesized via conventional solvent method, and its molecular structure has been identified by using various techniques including FTIR, 1H NMR, MS and elemental analysis. The crystal structure of ANMA is characterized by single crystal X-ray crystallography. Crystallographic data revealed that the spatial structure of ANMA belongs to monoclinic, P2 1 a space group. ANMA thin films were deposited onto optical flat quartz substrates by using thermal evaporation under vacuum pressure of 2 × 10-4 Pa. The optical properties of the films are studied in terms of the measurements of transmittance and reflectance determined at the normal incident of light over the spectral range 200-2400 nm. The absorption coefficient of the films is computed and the optical band gap of the films is estimated. In addition, the complex refractive index for the films has been calculated and described. Single oscillator model is found to be applicable for the films in which the dispersion parameters namely; single oscillator energy, dispersion energy, dielectric constant at high frequency, lattice dielectric constant and the ratio of carrier concentration to the effective mass are estimated. © 2013 Elsevier B.V. All rights reserved.
El-Menyawy E.M.,National Research Center of Egypt |
Abu El-Enein R.A.N.,Institute of Applied Technology
Materials Science in Semiconductor Processing | Year: 2013
Thin films with various thickness of 3-amino-2-[(2-nitrophenyl)diazinyl]-3- (piperidin-1-yl)acrylonitrile (ANPA) were produced by conventional thermal evaporation. The dependence of the optical, electrical, and photovoltaic properties on the film thickness was investigated. X-ray diffraction showed that the films have an amorphous structure. The optical properties were investigated in terms of transmittance and reflectance in the spectral range 200-2500 nm. Spectral distribution analysis of the absorption coefficient revealed that the films have an indirect allowed electronic interband transition. The optical bandgap decreased from 2.47 to 2.1 eV for an increase in film thickness from 105 to 265 nm. The direct current electrical conductivity of the films was measured for sandwich-structured samples as a function of the heating temperature and film thickness. The films exhibited semiconductor behavior and electrical conduction was attributed to hopping of charge carriers in localized states. ANPA films of differing thickness were deposited on p-type Si single-crystal substrates. The influence of film thickness on the electrical and photovoltaic parameters of Au/ANPA/p-Si/Al heterojunction solar cells was investigated. © 2013 Elsevier Ltd. All rights reserved.
Jaradat Z.W.,Jordan University of Science and Technology |
Jaradat Z.W.,Institute of Applied Technology |
Jaradat Z.W.,Monash University |
Hafiz L.A.,Jordan University of Science and Technology |
And 7 more authors.
Virulence | Year: 2014
This study was conducted to isolate Salmonella enteritidis from poultry samples and compare their virulence and antibiotic resistance profiles to S. enteritidis isolated from outbreaks in northern Jordan. Two hundred presumptive isolates were obtained from 302 raw poultry samples and were subjected to further analysis and confirmation. a phylogenic tree based on 16s rRNa sequencing was constructed and selected isolates representing each cluster were further studied for their virulence in normal adult swiss white mice. The most virulent strains were isolated from poultry samples and had an LD50 of 1.55 × 105 cFU, while some of the outbreak isolates were avirulent in mice. antibiotic resistance profiling revealed that the isolates were resistant to seven of eight antibiotics screened with each isolate resistant to multiple antibiotics (from two to six). Of the poultry isolates, 100%, 88.9%, 77.8%, 66.7%, and 50% showed resistance to nalidixic acid, ciprofloxacin, ampicillin, cephalothin, and cefoperazone, respectively. Two outbreak isolates were sensitive to all tested antibiotics, while 71.4% were resistant to cefoperazone and only 28.6% showed resistance to nalidixic acid. Salmonella outbreak isolates were genetically related to poultry isolates as inferred from the 16s rRNa sequencing, yet were pheno-typically different. although outbreak strains were similar to poultry isolates, when tested in the mouse model, some of the outbreak isolates were highly virulent while others were avirulent. This might be due to a variation in susceptibility of the mouse to different S. enteritidis isolates. © 2014 Landes Bioscience.
Sankar M.V.,Institute of Applied Technology |
Abdallah S.,The British University in Dubai |
Abdallah S.,University of Massachusetts Amherst |
Abdallah S.,University of Edinburgh
2015 International Conference on Information and Communication Technology Research, ICTRC 2015 | Year: 2015
Currently in UAE many higher educational institutes are replacing the traditional teaching and learning system with iPad based teaching and learning system. The focus of this paper is to study the effect of class size on the effectiveness of iPad based learning process in UAE high school classrooms. We conducted quantitative analysis in one of the UAE based high schools that implemented iPad-based teaching systems. Results show significant effect of class size on the effectiveness of the system. However, such effect was also shown to be insignificant if students are trained sufficiently on the new technology. © 2015 IEEE.
Zedan I.T.,HIGH-TECH |
El-Taweel F.M.A.,Damietta University |
Abu El-Enein R.A.N.,Institute of Applied Technology |
Nawar H.H.,Al Jabal Al Gharbi University |
El-Menyawy E.M.,National Research Center of Egypt
Journal of Electronic Materials | Year: 2016
In this study, 6-(5-bromothiohen-2-yl)-2,3-dihydro-1-methyl-3-oxo-2-phenyl-1H-pyrazolo[4,3-b]pyridine-5-carbonitrile (BDPC) powder was synthesized. BDPC powder showed a polycrystalline structure, whereas the thermally evaporated films had an amorphous structure. The optical parameters such as absorption coefficient and refractive index were calculated in the spectral range 200–500 nm. Spectral distribution analysis of the absorption coefficient revealed that the films had an indirect band transitions with energy gaps of 2.57 eV and 3.5 eV. According to the single oscillator model, the oscillation energy, dispersion energy, and dielectric constant were estimated. The room-temperature current–voltage characteristics of the fabricated Au/BDPC/p-Si/Al heterojunction showed diode-like behavior. The ideality factor, the barrier height and series resistance were determined based on thermionic emission theory and Norde’s function. At reverse bias, the current was interpreted in terms of the Schottky and pool-Frenkle effects in low and high voltages, respectively. The built-in voltage, carrier concentration and barrier height were obtained using capacitance–voltage characteristics. © 2016 The Minerals, Metals & Materials Society
Almomani M.A.,Jordan University of Science and Technology |
Tyfour W.R.,Jordan University of Science and Technology |
Nemrat M.H.,Institute of Applied Technology
Journal of Alloys and Compounds | Year: 2016
A study was made to evaluate the corrosion behavior when Cu-30Zn alloy is reinforced with different weight fractions of silicon carbide (SiC) particles in a simulated sea solution (3.5 wt% NaCl aqueous solution). The composites were produced via powder metallurgy (PM) route. For the sake of comparison, the corrosion behaviors of unreinforced and reinforced alloy were examined. Electrochemical measurements (potentiodynamic testing) showed that the corrosion rate of the composites decreased with increase of SiC weight percentages, as a result of weak microgalvanic couple between reinforcement particles and Cu-30Zn matrix, and the low possibility of intermetallic phases formation. ANOVA test indicated that the variations of corrosion rate of the composites upon changing weight percentages of SiC particles are statistically significant. Polarization curves showed that the passive film tends to be less stable, and the potential difference between passivation and free corrosion points increased with increase of SiC weight percentages, as SiC cathodically protect the matrix material by sacrificial anodic dissolution of crevice regions about reinforcement particles. Scanning Electron Microscope (SEM) images of the sample's surfaces before and after testing are in agreement with the electrochemical results. © 2016 Elsevier B.V.
Ai-Jumeily D.,Liverpool John Moores University |
Al-Zawi M.,Liverpool John Moores University |
Al-Zawi M.,Institute of Applied Technology |
Hussain A.J.,Liverpool John Moores University |
Dobre C.,Polytechnic University of Bucharest
Studies in Computational Intelligence | Year: 2014
Self-Managing systems are a significant feature inAutonomic Computing which is required for system reliability and performance in a changing environment. The work described in this book chapter is concerned with self-healing systems; systems that can detect and analyse issues with their behavior and performance, and fixe or reconfigure as appropriate. These processes should occur in real-time to restore the desired functionality as soon as possible. The system should ideally maintain functionality during the healing process which occurs at runtime. Adaptive neural networks are proposed as a solution to some of these challenges; monitoring the system and environment, mapping a suitable solution and adapting the system accordingly. A novel application of a modified Pipelined Recurrent Neural Network is proposed in this chapter with experiments aimed to assess its applicability to online. © Springer International Publishing Switzerland 2014.
Said R.,Institute of Applied Technology |
Shamsi A.A.,Institute of Applied Technology
2011 IEEE GCC Conference and Exhibition, GCC 2011 | Year: 2011
Today's knowledge-based economy demands continuous learning and innovation. The demand for specialized engineering expertise to run national strategic projects nowadays is more than ever, and the need to introduce engineering education at younger ages seems to be an ever-increasing urge in response to the challenges of the 21st century. Educational systems have to be reshaped in order to reduce the gap between scholastic education and real life experience. Career Technical Education (CTE) may be the right answer. The CTE model teaches the academic rigorous core curriculum, along with hands-on real life technical and professional skills. The Institute of Applied Technology (IAT) has adopted the CTE model in which core academic knowledge is integrated with technical and professional skills in relation to career clusters that are designed and customized to meet local community needs. The Institute's philosophy is quality education founded on a standards-based curriculum, with specific and measurable outcomes. © 2011 IEEE.