Al - Hussein Bin Talal University
Ma'an, Jordan

Al-Hussein Bin Talal University is a public coeducational university located in the heart of the southern region, 210 km from the Capital Amman.about 9 km to the northwest of Ma'an city in the southern region of Jordan. It was established by a Royal Decree on April 28, 1999. AHU is a comprehensive public university in a self-contained campus, and has student population representing nearly every Governorate in Jordan. over the past years, AHU has grown to eight colleges offering bachelor degree programs in natural and environmental science, business, nursing, education, humanities, IT and engineering; and two Deanships, the Deanship of Student Affairs and the Deanship of Scientific Research. AHU has nine scientific centers that are heavily engaged in research and development projects to serve local and national communities. Wikipedia.

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Irshaidat T.,Al - Hussein Bin Talal University
Molecules | Year: 2017

Tautomerism links with many applications and remains an attracting feature in exploring novel systems. In this regard, properties of indene-based HNCCCN segments have not received any considerable attention. In this computational organic chemistry study, first, to calculate the proton transfer energy barrier at a reasonable cost, the study identified an accurate forth order Møller-Plesset perturbation theory-density functional theory (MP4-DFT) protocol equivalent to the outstanding pioneering benchmark calculations. The calculations illustrate that the two tautomers of the 4-amino-3-iminoindene nucleus are separated by a considerable energy barrier while featuring different molecular orbital characteristics; frontier orbital distribution, max, and energies, which are known basic requirements in molecular switching and logic circuit applications. The N-H/BH2 substitution was found to have significant influence on the electronic structure of the skeleton. Similarities in the two tautomers and the boron derivative to properties of known molecular materials have been found. © 2017 by the author.

Al-Sarairah E.,Al - Hussein Bin Talal University
International Journal of Engineering Systems Modelling and Simulation | Year: 2017

In this paper, we investigate numerically the influence of heat loss and Damköhler number, which is inversely proportional to the square of strain rate, on the edges of premixed flames in a two dimensional counterflow for Lewis numbers greater than unity. The propagation speed of flame edges is plotted against Damköhler numbers for different values of the heat loss parameter showing a multiple flame edge solutions in the form of S shaped curves. © 2017 Inderscience Enterprises Ltd.

Al-Zboon K.,Al - Balqa Applied University | Al-Harahsheh M.S.,Al - Hussein Bin Talal University | Hani F.B.,Al - Balqa Applied University
Journal of Hazardous Materials | Year: 2011

The aim of this work was to synthesis highly amorphous geopolymer from waste coal fly ash, to be used as an adsorbent for lead Pb(II) removal from aqueous wastewater. The effect of various parameters including geopolymer dosage, initial concentration, contact time, pH and temperature on lead adsorption were investigated. The major components of the used ash in the current study were SiO2, Al2O3 and Fe2O3 representing 91.53wt% of its mass. It was found that the synthesized geopolymer has higher removal capacity for lead ions when compared with that of raw coal fly ash. The removal efficiency increases with increasing geopolymer dosage, contact time, temperature, and the decrease of Pb2+ initial concentration. The optimum removal efficiency was obtained at pH 5. Adsorption isotherm study indicated that Langmuir isotherm model is the best fit for the experimental data than Freundlich model. It was found also that the adsorption process is endothermic and more favorable at higher temperatures. © 2011 Elsevier B.V.

Al-Wardat M.A.,Al - Hussein Bin Talal University
Astrophysical Bulletin | Year: 2014

Atmospheric modeling and dynamical analysis of the components of the speckle interferometric binary system HD 6009 were used to estimate their individual physical and geometric parameters. Model atmospheres were constructed using a grid of Kurucz’s solar metallicity blanketed models and used to compute the individual synthetic spectral energy distribution (SED) for each component separately. These SEDs were combined together to compute the entire SED for the system from the net luminosities of the components A and B located at a distance d from the Earth. We used the modified feedback parameters and the iteration method to get the best fit between the synthetic and observed total SEDs. The physical and geometric parameters of the system’s components were derived as Teff A = 5625 ± 75 K, Teff B = 5575 ± 75 K, log gA = 3.75 ± 0.25, log gB = 3.75 ± 0.25, RA = 2.75 ± 0.30R⊙, RB = 2.65 ± 0.30 R⊙,MA = 1.60 ± 0.20 M⊙, MB = 1.46 ± 0.20 M⊙, LA = 15.84 ± 1.60 L⊙, and LB = 15.83 ± 1.60 L⊙, with G6 spectral types for both components. © Pleiades Publishing, Ltd. 2014.

Di(N-protected-α-amino)diazo-β-diketones were prepared by the reaction of activated N-protected-α-amino acids (imidazolides) with α-diazoketones, derived from natural amino acids, in the presence of lithium diisopropylamide in tetrahydrofuran as the solvent at -78 °C. © 2012 Elsevier Ltd. All rights reserved.

Abu Salim A.H.,Al - Hussein Bin Talal University
Journal of Geographical Sciences | Year: 2014

This study addresses the morphometric variables that determine the sediment yield in Wadi Al-Arja through the analysis of the impact of different morphometric characteristics along the course of the valley on its sediment yield, as well as the analysis of spatial and formal dimensions and morphologies of the basin and its relationship to the sediment yield. The study also addresses the size of variation in the volume of sediment yield of the river tributaries that make up the water network of the valley under the differences of its morphometric and hydrological characteristics. The study found several results, most notably: The classification of Wadi Al-Arja basin according to the hypsometric integral value (72.1%) within an uneven topography, which increases the force of the erosive activity and the size of the sediment yield if the basin was exposed to moist climatic periods. The study also showed the presence of convergence in the intra-spaces between the river tributaries in the water network. This increases the volume of water flows when these tributaries meet with each other and thus increasing their erosive ability and sediment yield. The study also showed the presence of marked variation in the sediment yield of the river tributaries depending on the differences in its morphometric characteristics. The results of the step-wise regression analysis confirmed the importance of the morphometric and hydrological variables, and plant coverage in interpreting the variation in the size of the sediment yield of the river tributaries of different stream order in Wadi Al-Arja basin, where these variables interpreted 43% of the total variation, with statistical significance less than 0.05. © 2014 Science Press and Springer-Verlag Berlin Heidelberg.

Al-Hamamre Z.,University of Jordan | Hararah M.A.,Al - Hussein Bin Talal University
International Journal of Hydrogen Energy | Year: 2010

In this study thermodynamics and kinetics analysis of the thermal partial oxidation (TPOX) of ethanol for producing hydrogen is performed. Equilibrium and kinetics calculations are performed in order to find the limiting parameters for the thermal partial oxidation. The effects of air ratio λ (the ratio of the oxidizer -to- fuel ratio to the stoichiometric oxidizer -to- fuel ratio) and mixture inlet temperatures (Tmix-in) on the reforming efficiency, the H2 mole number, the reaction progress, the equilibrium time and the ignition delay time are investigated. Furthermore, the analysis is performed using different kinetics schemes and the results are compared. The optimum practical operating conditions of the partial oxidation process of ethanol are identified. In this way, the results of this work can be useful as a guideline in experimental work. It is found that the reforming efficiency increases with increasing the process temperature for λ < 0.3 and remains nearly constant elsewhere. The efficiency reaches a maximum value of 90% at λ = 0.20 and Tmix-in ≥ 1000 K. The kinetics simulations suggest that three different regions exist during the partial oxidation process of ethanol: the oxidation region, the water gas shift reaction- reforming region and the reforming region. The reforming reactions in the 3rd region are the reaction process limiting step. Additionally, it is found that the equilibrium concentration of a given species is not affected by the pressure when the process temperature lies outside the range of 500 K < Tprocess < 1700 K. However, the minimum time required for a given species to reach the equilibrium is affected when pressures higher than 1 atm are employed. Pressures higher than 1 atm shift this minimum time towards lower values. Due to preheating limitations (self ignition and reactor material stability) and the kinetics behavior of the TPOX process of ethanol, practical operating conditions could be bounded in λ range of 0.4 to 0.45 and Tmix-in range of 650 K to 850 K. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

Altaif K.I.,Al - Hussein Bin Talal University
Asian Pacific Journal of Tropical Disease | Year: 2011

Objective: To determine the prevalence of parasitic infection among the population of Ma'an governorate. Methods: A retrospective analysis of laboratory records of stool specimens of patients seen in Ma'an hospital (in different specialties) during the period of 1 January 2009 to 31 December 2009 was carried out for the detection of intestinal parasites. Results: The total number of stool samples in the survey examined in this retrospective study was 1 999, and the number and percentage of positive samples were 338 and 16.9%, respectively. The highest incidence of intestinal parasites was during summer months (June-October), while the lowest incidence was during winter months (December-January). Six different parasitic species were detected. The highest frequency was among males both adult and children and was higher in adult males and females than children (male and female). Entamoeba histolytica and Giardia lamblia (80.7% and 15.7%, respectively) were the commonest species detected while Entrobius vermicularis (0.9%), Strongyloides stercoralis (0.6%), and hookworms (0.9%) were the least common. Conclusions: The results indicate that intestinal parasites in Ma'an governorate (south of Jordan) is not a major public health problem. Nevertheless, a comprehensive health education program and improvements to environmental sanitation should be developed to keep this health problem under control. © 2011 Asian Pacific Tropical Medicine Press.

Al-Khashman O.A.,Al - Hussein Bin Talal University
Environmental Earth Sciences | Year: 2013

190 Street dust samples were collected from nine different localities including high traffic (desert highway), moderate traffic (city center), light traffic (minor streets), residential streets, school gardens, hospital and health centers, industrial sites, parks and background sites (control) of Ma'an area. The concentrations of Fe, Zn, Ni, Pb, Mn, Cu and Cd were analyzed by flame atomic absorption spectrophotometer to assess and to compare road dust contamination levels of metals among the different types of urban environment. The results showed that dust samples from the urban and industrial site contained significant levels of the metals studied compared to the values obtained from the background site. The variation in concentration of the heavy metals determined from different locations was in the decreasing order as: industrial > high traffic > parks > moderate traffic > hospital and health centers > school gardens > light traffic > background sites. The mean concentrations of the metals were in the order of C Fe > C Zn > C Ni > C Pb > C Mn > C Cu > C Cd where C is the concentration of these metals in solution. Enrichment factor calculations indicated that Cd, Pb, Zn and Ni were highly enriched. Fossil fuel combustion, wear of brake lining materials, traffic emissions and several industrial processes are considered the main sources of these metals. Assessment of the contamination level in dust sample was estimated based on the geoaccumulation index (I geo), the pollution index, and integrated pollution index (IPI). The values of IPI are in the following order: Pb > Zn > Cu > Ni > Cd > Mn. All the indices for the metals under consideration were either low or corresponded to middle level of contamination. The use of factor analysis showed that anthropogenic activities seem to be the responsible source of contamination for metals in dust samples. © 2013 Springer-Verlag Berlin Heidelberg.

Al-Khashman O.A.,Al - Hussein Bin Talal University
Soil and Sediment Contamination | Year: 2012

The aim of this study was to assess the extent and severity of metal contamination of soils in the east of the Dead Sea, southwestern Jordan. This area was affected by a potash plant and intensive agricultural production. The samples were obtained at two depths, 0-10 cm and 10-20 cm, and were analyzed by atomic absorption spectrophotometry for Cu, Fe, Zn, Mn, Pb, Cd, and Cr. Physicochemical parameters that are expected to affect the mobility of metals in the soil such as pH, TOM, CaCO 3, CEC, and conductivity were determined. The relatively high concentrations of metals in soils of the studied area were related to anthropogenic sources such as the potash industry, agricultural activities, and traffic emissions. The mean concentrations of the metals were of the order: C Fe > C Pb > C Zn > C Cr > C Mn > C Cu and C Cd where C is the concentration of these metals in solution. Heavy metals such as Zn, Cd, and Pb showed higher concentrations in the area that is closer to the potash plant, while Cr concentration was low. These metals were concentrated in the soil surface and decreased in the lower part of soil due to their mobility, movement and physicochemical properties, and alkaline pH. Metals of anthropogenic origin, including Cd, Pb, and Zn, were highly enriched with respect to crustal composition. The non-clay minerals of the sand-sized fraction are composed mainly of quartz and calcite as major minerals, with dolomite and feldspar as minor minerals. Factor analysis revealed three groups of elements that differ in their distribution. The first of these components is unpolluted soil, which was distributed in the study area. The second is the polluted soil, which occurs mostly around the potash plant and Ghore El-Safi area. The third factor represents the physicochemical sources, and is not significant. © 2012 Copyright Taylor and Francis Group, LLC.

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