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Irbid, Jordan

The Jordan University of Science and Technology , often abbreviated JUST, is a comprehensive, state-supported university located on the outskirts of Irbid, at Ar Ramtha in northern Jordan.Since its establishment in 1986, JUST has been at the forefront of institutions of higher learning in the Arab world, it also maintains a high reputation and standard amongst the universities of the Middle East. JUST and the University of Jordan in Amman are considered to be the two premier institutions of higher education for engineering and medicine in the country, although numerous other faculties and specializations are represented as well. The university was described as the best scientific institution in the Kingdom by King Abdullah II during a visit in November '10. As of the 2006/2007 academic year, JUST had 717 faculty members, with 20,000 undergraduate and 1559 graduate students, in contrast to 2,300 students in the 1986/1987 academic year. At the present time, the university comprises 12 faculties and 55 departments providing 52 bachelor's degree and 95 postgraduate programs. JUST comprised 5,415 international students of 61 nationalities in the academic year 2009/2010, rendering it the most cultural-diverse university in Jordan. It was ranked as the top research university in the country, and amongst the top 3% of universities in the Islamic world, according to a study carried out by the Statistical, Economic and Social Research and Training Center for Islamic Countries . Wikipedia.

Bataineh K.M.,Jordan University of Science and Technology
Renewable and Sustainable Energy Reviews | Year: 2016

This paper investigates the performance of solar thermal system for powering irrigation pump. It also summarizes the recent developments of solar thermal power systems. Furthermore, it updates the literature about the recent findings of thermal solar power system and presents different methodologies of enhancing the solar energy conversion system. The solar thermal irrigation pump uses steam Rankine cycles SRC integrated with parabolic trough collector PTC. The selected site is located in the northern part of Jordan. Simulation models are built to assess the performance of solar thermal irrigation system. The simulation models are built by means of mass and energy balances applied to every component of the system. The model simulates the hourly thermal behavior of all system components. The effect of key operating variables on the system performance is examined. Simulation results show that there is an optimum values for mass flow rate where maximum power out can be obtained. The average daily overall efficiency ranges between 10 to 13% during summer time. The optimal daily average overall efficiency reaches 18%. Results show that the concentration ratio has negligible effect on the overall system performance. It is found that using PTC of area of 526 m2 with SRC is reliable system producing above 30 kW during summer time. Economic analysis reveals that the solar energy cost is $0.075/kWh. Furthermore, this paper presents design optimization so that STWP can achieve higher reliable continuous operation with system components. © 2015 Elsevier Ltd. All rights reserved. Source

The direct-injection stratified charge (DISC) engine is a hybrid between spark ignition (SI) and compression-ignition engines, it combines many of the best features of both with some unique advantages of its own. This includes multi-fuel capability, high thermal efficiency, low NOx production, and low particulate emissions.This work shows how simple semi-global models can predict the performance of the SI and DISC engines with reasonable accuracy, without going to details of modeling for internal processes such as: swirl, mixing and detailed combustion kinetics.The operating variables studied were inlet manifold pressure p i, exhaust manifold pressure p e, engine speed N, equivalence ratio Φ, and volumetric efficiency η v at different loads. The corresponding performance parameters were the brake mean effective pressure bmep, brake power P b, and brake thermal efficiency η b,th. The main contribution of this work is the production of friendly set of curve-fitting correlations for engine performance. The bmep and the P b increase with the load for both engines. For spark ignition engines the bmep increases by about 70% when load increases from 50% to 100%. With the DISC engine, this ratio increases to 75%. The percent improvement in η b,th for the DISC to the SI engine is around 50% which increases with part load, lower compression ratio r c and p i. © 2011 Elsevier Ltd. Source

Mayyas K.,Jordan University of Science and Technology
Digital Signal Processing: A Review Journal | Year: 2013

Selective partial update of the adaptive filter coefficients has been a popular method for reducing the computational complexity of least mean-square (LMS)-type adaptive algorithms. These algorithms use a fixed step-size that forces a performance compromise between fast convergence speed and small steady state misadjustment. This paper proposes a variable step-size (VSS) selective partial update LMS algorithm, where the VSS is an approximation of an optimal derived one. The VSS equations are controlled by only one parameter, and do not require any a priori information about the statistics of the system environment. Mean-square performance analysis will be provided for independent and identically distributed (i.i.d.) input signals, and an expression for the algorithm steady state excess mean-square error (MSE) will be presented. Simulation experiments are conducted to compare the proposed algorithm with existing full-update VSS LMS algorithms, which indicate that the proposed algorithm performs as well as these algorithms while requiring less computational complexity. © 2012 Elsevier Inc. All rights reserved. Source

Nimri L.F.,Jordan University of Science and Technology
Diagnostic Microbiology and Infectious Disease | Year: 2013

Escherichia albertii is a newly emerging enteric pathogen that has been associated with sporadic infections among humans and birds. Selected coliform isolates were screened for allelic variation in 2 housekeeping genes (lysP and mdh) specific for E. albertii. The 48 strains that were identified as E. albertii were tested for 15 virulence markers and biochemical and serogical properties. All E. albertii strains were non-motile, fermented D-glucose (with gas), D-mannitol, and D-mannose, but failed to ferment lactose and other sugars. Variable positive reactions were noted for other tests. Most strains were rough or failed to agglutinate with Shigella boydii 13 antisera and E. coli antisera with few exceptions. All strains were positive for the eaeA gene, and variable numbers were positive for the cdtB, phoE, ehxA, and stx2f genes. Results illustrate the variability extent within this lineage and highlight the importance of accurately distinguishing it within the genus Escherichia and including information within commercial databases to improve their identification. © 2013 Elsevier Inc. Source

Najjar Y.S.H.,Jordan University of Science and Technology
International Journal of Hydrogen Energy | Year: 2013

With increasing world energy demands, the search for an environmentally-friendly fuel is a must. Hydrogen is a fuel that is energy-efficient and clean, and considered by many as the perfect fuel. The problem arises when it comes to safety considerations. It does not have a good reputation because of some unfortunate accidents during history. In this work the safety of hydrogen during production, transmission and use is reviewed. Hydrogen safety issues are mainly discussed in relation to its ignition and combustion characteristics namely: wide flammability range detonation level, low ignition energy, relatively high flame velocity, rapid diffusion and buoyancy, in addition to it its characteristics in the liquid phase. Hydrogen is the lightest gas (14 times lighter than air), highly flammable, odorless, and burns with a colorless flame. When used as a fuel, it supplies more energy per unit mass, than the popular fuels used today. In producing hydrogen, there are many processes, each one with its hazards, but these are relatively less weighed against hydrogen having the highest energy-carrying abilities. In storing, transmission and using of hydrogen, the main hazard is in its leaking, causing a fire to start. To detect when a leak happens, reliable and economic sensors should be used. High degree of safety, depending on hydrogen properties, is essential in any relevant design, to accelerate toward hydrogen economy. Copyright © 2013, Hydrogen Energy Publications, LLC. Source

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