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Amman, Jordan

GJU is a public university located in Al Mushaqqar near Madaba, Jordan. It offers more than 20 programs to roughly 5000 enrolled students, primarily from Jordan. The curriculum differs from other Jordanian universities by offering German language courses as preparation for the fourth academic year at a university of applied science in Germany and an introduction to German industry. Wikipedia.

Abdallah A.,German Jordanian University
International Journal of Health Care Quality Assurance

Purpose: Various quality initiatives seem to have successful implementation in some healthcare organizations yet fail in others. This paper sets out to study the literature trying to understand drivers and challenges facing quality initiatives implementation in healthcare organizations then compare findings from literature with those of a structured questionnaire answered by 60 representatives from 18 hospitals. Finally it proposes a framework that mitigates challenges and utilizes drivers to ensure best implementation results. Design/methodology/approach: Literature regarding implementing various quality initiatives in the healthcare sector was reviewed. Representatives from several healthcare organizations were surveyed. Results from both approaches are compared to highlight the key challenges and drivers facing implementers. Findings: This research reveals that internal factors related to leadership and employees greatly affect quality initiative success or failure. Design and relevance play a major role in successful implementation. Practical implications: This research offers healthcare professionals greater success when implementing certain quality initiatives by taking success/failure factors into consideration. A general framework for successful implementation in the healthcare sector is provided. Originality/value: This article uncovers reasons behind success or failure in a comprehensive and practical way. It also explores how most popular quality initiatives are applied in hospitals. © Emerald Group Publishing Limited. Source

Al-Agtash S.,German Jordanian University
Computers in Industry

This paper presents a novel architecture of electricity agents in smart grid markets. The architecture implements a middleware that allows standard agent plug-ins representing "smart grid" elements in a two-way power flow. Agent operations are automated to allow demand variations and exploring a wider spectrum of trade opportunities in an efficient manner, while coordinating with the system operator for reliability, security, and stability. We give trade and operation computational models of power grid components and their interaction protocols and authentication in a multi-agent framework. Trade models are both pool and multilateral based. Operation models respect power dispatch limits, generation and transmission constraints, and spinning reserve requirements. The models are coded as part of the agent software. The protocols are KQML (Knowledge Query Manipulation Language) based communication. An IEEE 5-bus grid system is used for illustration. The testing results for different load profiles show better distribution of market sales and a market clearing price convergence very close to the marginal cost of generation supply, thus an implication of economic efficiency of energy resources, as well as security and power quality compared to traditional electricity trade models based on Cournot and Bertrand estimated clearing prices. © 2012 Elsevier B.V. Source

Sari M.S.,German Jordanian University
International Journal of Mechanical Sciences

The free vibration analysis of non-local annular sector Mindlin plates has been investigated. Mindlin plates at the micro/nano-scale are modeled using Eringen's nonlocal elasticity theory, where the small scale effect is taken into consideration. The governing equations are derived using the nonlocal differential constitutive relations of Eringen. For this purpose, the resulted eigenvalue problem is solved numerically by applying the Chebyshev collocation method. The effects of the inner to outer radius ratio, the thickness to outer radius ratio, the nonlocal scale effect, and the boundary conditions on the natural frequencies have been studied. © 2015 Elsevier Ltd. All rights reserved. Source

Tashtoush B.,Jordan University of Science and Technology | Alshare A.,German Jordanian University | Al-Rifai S.,Jordan University of Science and Technology
Energy Conversion and Management

In this work the performance of the ejector cooling cycle is investigated at critical mode, where, the effects of ejector geometry, refrigerant type, and operating condition are studied. The ejector cooling cycle is modeled with EES Software. The mass, momentum, and energy conservation principles are applied to the secondary and primary flows to investigate the performance of the ejector cooling cycle under superheated primary flow. The refrigerant R134 a is selected based on the merit of its environmental and performance characteristics. The primary working fluid in the refrigeration cycle is maintained at superheated conditions for optimal ejector performance. The solar generator temperature ranges are 80-100 °C. The operating temperature of evaporator range is 8-12 °C and the optimal condensation temperature is in the range of 28-40 °C. It is found that constant-pressure mixing ejector generates higher backpressure than constant-area mixing ejector for the same entrainment ratio and COP. The type of ejector is selected based on the performance criteria of the critical backpressure and choking condition of the primary flow, the so called EJ2 type ejector meets the criteria. The COP is found to be in the range of 0.59-0.67 at condenser backpressure of 24 bar due to higher critical condenser pressure and higher generator temperature. © 2015 Elsevier Ltd. All rights reserved. Source

Tashtoush B.,Jordan University of Science and Technology | Alshare A.,German Jordanian University | Al-Rifai S.,Jordan University of Science and Technology
Energy Conversion and Management

This work describes a simulation program developed on the TRNSYS-EES softwares. This program is used to design the solar collector subsystem components and to evaluate the performance of the solar ejector cooling system with R134a as a refrigerant. In addition dynamic hourly simulation of 7 kW solar ejector cooling system (SECS) constant pressure mixing components, using TRNSYS software is carried out. The performance of solar collector and the overall system performance are investigated and the ejector sub-system is modeled with EES software. The solar collector type, area, storage tank size, and the flow rate through the cycle are optimized. Solar collector type and area are selected based on the maximum energy gain, where the maximum energy gain is a measure of the collector performance. The system performance is computed in the form of desired outlet temperature to run 7 kW cooling cycle. The effect of tilt angle on the solar system performance is investigated and the optimum tilt angle for the best performance of the system is determined. Selection of the best refrigerant to meet the cooling requirement with the maximum COP is studied. In addition, the time fraction of the storage tank outlet temperature for different collector areas, at a mass flow rate of 50 kg/h m2 is investigated. It is found that evacuated tube type has better performance than the flat plate type, where each collector is anchored at its optimal tilt angle of 28°. Furthermore, the energy required of the 7 kW-cooling-system is adequately met with the selection of an evacuated-tube solar collector system with an area of 60-70 m2. The solar fraction is in the range of 0.52-0.542 and the corresponding time fraction is 5.04 h/days. Hourly and monthly simulation of SECS, which is supplemented with 2 m3 storage tank size and operated at a flow rate of 50 kg/h per square meter of collector area is carried out. Under peak solar radiation and highest ambient temperature, the overall system efficiency has a minimum value of 0.32, whereas the COPejec of the ejector cooling cycle for this model is in the range of 0.52-0.547, the solar collector efficiency is between 0.52 and 0.92, and the overall COPo is in the range of 0.32-0.47. © 2015 Elsevier Ltd. All rights reserved. Source

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