Isra University of Jordan

Amman, Jordan

Isra University of Jordan

Amman, Jordan
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Hussein N.,Isra University of Jordan
Jordan Journal of Mechanical and Industrial Engineering | Year: 2016

Jordan's high reliance on foreign energy sources forced the country to reconsider its energy consumption policies and address the issue of reliance on international energy markets for direct imports. Moreover, renewable energy sources offer important environmental, social and economic benefits. Wind and Solar energy, in particular, carries a very good potential in solving the energy problem in Jordan, diversify its energy supplies and reduces greenhouse gas emissions. This paper focuses on the Green House Gas (GHG) emission reduction associated with the implementation of Jordan energy strategy's solar and wind projects. Four different scenarios were investigated based on the replaced traditional fuel type used for electricity generation that the proposed project will replace. The study shows that the proposed solar and wind project will result in a significant reduction of the country's projected greenhouse gas (GHG) emissions of 1.93-3.21 mega tons of CO2e annually. © 2016 Jordan Journal of Mechanical and Industrial Engineering.


Abu-Rumman G.,Isra University of Jordan
International Journal of Soil Science | Year: 2016

Background and Objective: Addition of organic wastes to agricultural soils is becoming a common practice as a disposal strategy and to improve the physical and chemical soil properties and increase the soil productivity. Amendments of agricultural lands with olive pomace become a common practice in the middle East. However, the olive mills waste contains small fraction of oil which might affects soil water retention and infiltration. The objectives of this study were to investigate changes in soil physical properties resulted from the addition of Olive Mill Solid Waste (OMSW). The properties studied were: Penetration depth, water holding capacity, accumulated intake and bulk density. Materials and Methods: The Olive Mill Solid Waste (OMSW) at three rates: 3, 6 and 9% by weight were added to two soils classified as clay (clay 55, silt 25 and sand 20%) and sandy clay (sand 55, clay 40 and silt 5%) soils. A pressure plate apparatus was used to construct soil water retention curves at a pressure varies between 0.30 (Wilting) to 1500 kPa (Saturation). The infiltration tests were performed using FEL5 demonstration infiltration apparatus. Results: The application of (OMSW) significantly improved the physical properties of the soils studied relative to untreated soil (control). For clay soil and application rate of 9%, the penetration depth and accumulated water intake were increased 30 and 29%, respectively. The corresponding increases in sandy clay soil were 25 and 32%, respectively. At application rate of 9%, the soil (WHC) increased were 10.3 and 16.5% for clay and sandy clay soils, respectively. Accumulation intake increased as application rate increased; while bulk density decreased as a result of the dilution effect resulting from mixing organic matter with the more dense soil minerals. Conclusion: Applications of OMSW increases the organic content of the soil and at the same time reduces its bulk density. The increase in (WHC) at field capacity and wilting point can be attributed to changes in soils textures which resulted from increases in soil organic C. The Water Holding Capacity (WHC), penetration depth and accumulated infiltration increased as (OMSW) application rates increased. The increases in (WHC) depend on soil texture, for fine-textured soils, the increase in (WHC) at wilting point is less than at field capacity. The opposite occurred in coarse-textured soils as a result of sand fraction, significant increase in (WHC) at wilting point rather than at field capacity. © 2016 Ghaida Abu-Rumman.


Ikhmayies S.J.,Isra University of Jordan
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2017

Three-dimensional zinc oxide (ZnO) microflowers of average diameter 1.1 ± 0.25 µm were produced in this work by the spray pyrolysis (SP) method in thin film form on glass substrates at a substrate temperature of 350 ± 5 °C. X-ray diffraction revealed that the films are hexagonal (wurtzite) with high crystallinity and preferred (002) orientation. Scanning electron microscope (SEM) images revealed the morphology of the films, which consists of hexagonal microdiscs, and these microdiscs self-assembled into three-dimensional microflowers. The hexagonal microdiscs have noticeable thickness and average size of 500 ± 130 nm. The microflowers have hexagonal shapes, and some of them are linked together to form larger three-dimensional structures. Assembling of the microdiscs and formation of the three-dimensional hexagonal flowers occurred during the deposition process without the aid of any surfactant. X-ray energy dispersive spectroscopy (EDX) showed that the films are non-stoichiometric, and they contain chlorine besides Zn and O. These three-dimensional flowers are of potential use in several technological applications such as gas sensors, electronic devices, and solar cells. © 2017 The Minerals, Metals & Materials Society and ASM International


Ikhmayies S.J.,Isra University of Jordan
Journal of Electronic Materials | Year: 2016

Zinc oxide (ZnO) microrods were synthesized by the spray pyrolysis technique on aluminum substrates at a substrate temperature of 350 ± 5°C. The samples were characterized by x-ray diffraction (XRD), x-ray fluorescence (XRF), scanning electron microscopy (SEM), and energy dispersion x-ray spectroscopy (EDX). XRD diffractograms presented the wurtzite (hexagonal) structure with (002) as the preferential orientation. The SEM observations showed typical microrods of hexagonal cross sections with lengths in the range 1.0–2.5 μm and diameter in the range 300–400 nm. XRF and EDX analysis revealed that the samples contain chlorine, and other impurities, which are related to the aluminum substrate and the starting material zinc chloride (ZnCl2). It is found that the microrods are rich in oxygen, which make them of potential use in gas sensors, besides solar cells, lithium ion batteries and other electo-optic devices. © 2016 The Minerals, Metals & Materials Society


Ikhmayies S.J.,Isra University of Jordan
International Journal of Hydrogen Energy | Year: 2016

Polycrystalline, fluorine doped tin oxide (SnO2:F) thin films were prepared by the low cost spray pyrolysis (SP) technique on glass substrates at 400 °C. To study the influence of annealing on the optical properties, the films were annealed in nitrogen atmosphere at 400 °C for 30 min. Scanning electron microscopy (SEM), energy dispersion X-ray spectroscopy (EDX), and transmittance spectroscopy were used to characterize the films. It is found that annealing reduces the transmittance and direct optical bandgap energy, and increases the reflectance, extinction coefficient, refractive index, real and imaginary parts of the dielectric constant, dispersion parameters, loss factor, and optical conductivity. These results are important for the use of tin oxide in solar cells and optoelectronic devices. © 2016 Hydrogen Energy Publications, LLC.


Mohammad M.A.,Isra University of Jordan
Journal of Chromatography A | Year: 2013

The calculated data of inverse gas chromatography (IGC) vary depending on the calculation methods and the n-alkane series. To overcome IGC data variability, this paper combines the Van Oss-Good-Chaudhury concept, the Dorris-Gray equation, the Schultz equation, the Fowkes equation and group contribution theory to establish the chromatographic adhesion law and its equation is Kia=eδEia/kT. In the equation, Kia is the adhesion retention factor of a chemical group, δEia represents the increased chromatographic adhesion energy due to this group and kT expresses the thermal kinetic energy of the molecule containing this group. The dispersive component (γSd), the electron acceptor component (γS+) and the electron donor component (γS-) of a solid surface are then calculated from δEia. Through correlating the retention time with the adhesion energy, this law expresses mathematically the chromatographic adhesion phenomenon of IGC at the infinite dilution region. This paper also derives a new equation to calculate the retention time of a non-adsorbing probe (dead retention time). © 2013 Elsevier B.V.


Afaneh S.,Isra University of Jordan | Zitar R.A.,University of Jordan | Al-Hamami A.,Amman Arab University
Applied Soft Computing Journal | Year: 2013

This paper presents a novel approach for computer viruses detection based on modeling the structures and dynamics of real life paradigm that exists in the bodies of all living creatures. It aims to develop an algorithm based on the concept of the artificial immune system (AIS) for the purpose of detecting viruses. The algorithm is called Virus Detection Clonal algorithm (VDC), and it is derived from the clonal selection algorithm. The VDC algorithm consists of three basic steps: cloning, hyper-mutation and stochastic re-selection. In later stage, the developed VDC algorithm is subjected to validation, which consists of two phases; learning and testing. Two main parameters are determined; one of them is setting the number of signatures per clone (Fat), while the other defines the hypermutation probability (Pm). Later on, the Genetic Algorithm (GA) is used as a tool, to improve the developed algorithm by searching the values of the main parameters (Fat and Pm) to reproduce better results. The results have shown that the detection rate of viruses, by using the developed algorithm, is 94.4%, whereas the detection rate of false positives has reached 0%. These percentages indicate that the VDC algorithm is sufficient and usable in this field. Moreover, the results of employing the GA to optimize the VDC algorithm have shown an improvement in the detection speed of the algorithm. © 2012 Elsevier B.V.


Ikhmayies S.J.,Isra University of Jordan
Energies | Year: 2016

Understanding the properties of CdSTe ternary alloys is important because they always form at the interface between the CdS window layer and CdTe absorber layer in CdS/CdTe solar cells due to the intermixing. This interdiffusion is necessary because it improves the device performance. Experimental work has been devoted to studying Te rich p-type CdSxTe1-x alloys, but there is a lack of studies on S-rich n-type CdS1-yTey solid solutions. In this work, a review of the structure, morphology, and optical properties of the S-rich n-type CdS1-yTey thin films produced by the spray pyrolysis technique on glass substrates is presented. © 2016 by the author.


Ikhmayies S.J.,Isra University of Jordan | Ahmad-Bitar R.N.,University of Jordan
Renewable Energy | Year: 2013

Tin oxide (SnO 2) thin films with thickness in the range 100-600 nm were prepared by vacuum evaporation on glass substrates at ambient temperature. X-ray diffractograms showed that the films have poor crystallinity. The transmittance of the films was measured at room temperature in the wavelength range 290-1100 nm. The absorption coefficient was plotted as a function of photon's energy for films of different thickness and oscillatory behaviour was observed in the high energy side. This oscillatory behaviour which was found to increase with film thickness is evidence on the presence of nanoparticles. Direct and indirect optical bandgap energies were estimated and found to be decreasing with film thickness. Urbach tailing in the bandgap was observed and the width of the tail which is related with disorder and localized states was estimated and found to be decreasing with film thickness. © 2012 Elsevier Ltd.


Ikhmayies S.J.,Isra University of Jordan | Ahmad-Bitar R.N.,University of Jordan
Solar Energy | Year: 2012

In CdS/CdTe solar cells it is necessary to determine the efficiency limitations related with the intermixing at the interface between the CdS window layer and CdTe absorber layer. So understanding the properties of the solid solution (CdS xTe 1-x on the CdTe side which is CdTe rich and CdS 1-yTe y on the CdS side which is CdS rich) that is always formed in this region is essential. We produced thin films of CdS 1-yTe y solid solution-which is CdS rich - by first producing CdS:In thin films on glass substrates by the spray pyrolysis technique and then annealing the films in nitrogen atmosphere at 400°C in the presence of Te vapor. We are the first who produce this solid solution by this simple and low cost method. The composition and morphology of the films were determined by energy dispersive X-ray detection (EDAX) measurements and scanning electron microscopy (SEM) observations respectively. Eight values of y in the range 0≤y≤0.2845 were obtained. The transmittance was measured and used to investigate the optical bandgap energy by using the second derivative of the absorbance. It is found that the films show a single hexagonal phase for y≤0.0852 and then a mixed (hexagonal and cubic) phase for 0.0997≤y≤0.2845. Bandgap energies in the range 2.259≤E g≤2.528eV were obtained. Urbach tailing in the bandgap was also investigated. © 2012 Elsevier Ltd.

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