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Amman, Jordan

Al-Balqa` Applied University is a government-supported university located in Salt, Jordan, was founded in 1997, a distinctive state university in the field of Bachelor and Associate degree Applied Education, at the capacity of more than 21,000 student distributed into 10,000 at the Bachelor degree program and 11,000 at the Associate degree program. Wikipedia.

El-Amoush A.S.,Al - Balqa Applied University
Materials Chemistry and Physics

The effect of annealing conditions producing various grain sizes on the intergranular corrosion behavior of high-strength aluminum alloy type 7075-T6 was investigated using electrochemical polarization techniques. Aluminum alloy specimens with large grain size exhibited lower breakdown potentials in deaerated 0.5 M NaCl solution. The breakdown potentials decreased with increasing grain size. Microscopic observations of the exposed surfaces during potentiostatic polarization testing showed that the coarse grain structure promotes intergranular crack growth. © 2010 Elsevier B.V. All rights reserved. Source

Abu-Khader M.M.,Al - Balqa Applied University
Renewable and Sustainable Energy Reviews

This study presents the advances in plate heat exchangers both in theory and application. It dresses the direction of various technical research and developments in the field of energy handling and conservation. The selected areas of heat transfer performance and pressure drop characteristics, general models and calculations change of phase; boiling and condensation, fouling and corrosion, and welded type plate heat exchangers and finally other related areas are highlighted. © 2012 Elsevier Ltd. All rights reserved. Source

Arundo donax reed grows in a natural ecosystem in Wadi Shueib in Jordan and is also grown in constructed wetlands built for domestic wastewater treatment. The utilization of leaves of excessive A. donax reed as an ecosystem bio-waste for the removal of Cd2+ from aqueous solutions was investigated. Effects of pH (3.5 to 7.5), contact time (10 to 360min), adsorbent dose (2.5 and 5gl-1), and adsorbate concentration (5 to 50mgl-1) at an ionic strength of 0.01M NaNO3 on adsorption efficiency and capacity were studied in batch adsorption experiments. Cadmium removal percentage of 92% occurred in 20mgl-1 Cd solutions at pH 5.5 containing 5gl-1 powdered leaves of A. donax. Cadmium removal percentage increased to 97% with decreasing the adsorbent dose to 2.5gl-1. The adsorption process was relatively fast and equilibrium was attained at 120min contact time. The equilibrium adsorption capacity of A. donax leaves increased from 1.96 to 18.80mgg-1 with increasing initial Cd concentration from 5 to 50mgl-1. The kinetic process of Cd2+ adsorption onto leaves of A. donax obeyed the pseudo-second-order kinetic model (R2>0.9995) indicating that chemisorption is the rate-limiting step. Although Freundlich and Langmuir isotherm models described well the experimental data, equilibrium isotherm data were best described by Freundlich model (R2 0.990 and 0.978, respectively). The monolayer adsorption capacity was 27.9mgg-1. A. donax leaves can be potentially used as a raw material of low cost eco-biosorbent for treating Cd-contaminated water systems. © 2014 Elsevier B.V. Source

Listeria monocytogenes, frequently associated with ready-to-eat meat products (RTE-MP), is the causal agent of listeriosis, the virulent foodborne disease. Accordingly, this work aimed to study the effectiveness of essential oils (EOs) of different plants to control growth of L.monocytogenes in RTE-MP model. EOs antilisteric activities were screened by disk diffusion method. Then, efficacy of EOs (1% v/w) with strong inhibition activities were further examined in meat luncheon model, against 2 levels of L.monocytogenes strains cocktail (3 and 6 log CFU/g) coupled with storage at 4°C for 14 days. The EOs of Fir and Qysoom showed to have the highest significant (p<0.05) antilisteric activity. In the food model, L.monocytogenes populations in control samples increased by 4 log cycles after 14 days of storage at 4°C. At the end of storage, for samples with low contamination; Fir, Qysoom, and EOs mixture had approximately 6.37, 6.04, and 5.53logCFU/g of L.monocytogenes respectively, compared to 6.90log of control. Whereas in the samples with high contamination level, populations reached to 8.43, 8.88 and 6.75logCFU/g for Fir, Qysoom, and EOs mixture respectively, compared to 9.90log of the control. The application of 1% EOs (v/w) to RTE-MP surfaces significantly showed to reduce (p<0.05) the L.monocytogenes populations growth rate as compared to control in the 2 levels treatments after 14 days of storage at 4°C. Accordingly, our results suggest that these EOs could be used as natural bio-preservatives in many food products produced in Jordan and worldwide, particularly in RTE-MP. ‡Efficacy of essential oils (EOs) of different plants to control growth of L.monocytogenes in RTE-MP model were studied. © 2013 Elsevier Ltd. Source

Lafi O.A.,Al - Balqa Applied University
Journal of Alloys and Compounds

Differential scanning calorimeter (DSC), under non-isothermal condition, was used to study the glass transition kinetics and the crystallization mechanism of Se 90Cd 8Bi 2 and Se 90Cd 6Bi 4 glassy alloys. Two approaches, namely Moynihan and Kissinger, were used to calculate the relaxation activation energy (E t) from the dependence of the glass transition temperature (T g) on the heating rate (β). Results reveal that E t decreases with an increase in Bi content which indicates that thermal stability is improved. This is attributed to the formation of Se-Bi bonds which are stronger than Se-Cd bonds and heavily cross-link the structure. In addition, the kinetic analysis of the crystallization peaks was performed using Ozawa, Kissinger, Takhor and Augis-Bennett relations. The values of the crystallization activation energy (E c) and Avrami exponent (n) of the two alloys were evaluated. The obtained values of E c, calculated from the above mentioned relations, were found to be in good agreement while the average calculated values of Avrami exponent (n) are (2.3 ± 0.1) for Se 90Cd 8Bi 2 and (1.7 ± 0.1) for Se 90Cd 6Bi 4 which indicating that the crystal growth in the two alloys occurs in one dimension. © 2012 Elsevier B.V. All rights reserved. Source

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