2nd International Conference on Electrical Information and Communication Technologies, EICT 2015 | Year: 2015
A numerical approach is presented to calculate crystal orientation-dependent effective mass of heavy hole, light hole and spin-orbit split-off hole of III-V semiconductors (GaAs, InAs, InP, GaSb, and InSb etc.) at Gamma-point by envelope approximation using k.p method. Unitary transformation is used to modify the wave vector and eight-band k.p Hamiltonian is applied in conventional (100) crystal orientation. The simulation is carried out for conventional crystal orientations (100), (110) and (111) as well as non-conventional orientations (113), (131) and (201). It is found that there is a substantial correlation between the effective mass and the crystal orientation. The results obtained from conventional crystal orientations are compared with that of estimated by well-established PBE, HSE and MBJLDA methods and found to have within good agreement. This indicates that the proposed technique can be applied to evaluate effective mass in arbitrary orientation of III-V semiconductors. It is also found that (113) orientation possesses lowest effective mass than other orientations. The outcome of this paper would be a boost to design high-speed optoelectronic devices with improved performance by introducing non-100 oriented epitaxial layers. © 2015 IEEE.
Poddar S.,Banglalink Digital Communication Ltd. |
Roy S.,JUST |
ICEEE 2015 - 1st International Conference on Electrical and Electronic Engineering | Year: 2015
A dual triangular cut resonator (DTCR) design of a patch antenna is proposed. The antenna is able to perform at 2.44 GHz band applicable for wireless local area networks. The gain and directivity are 7.75 dB and 8.29 dBi, respectively. Proposed cut resonator develops stored capacitive charge and boosts the antenna radiation and electromagnetic field which enhances the antenna performance. © 2015 IEEE.
Diaz O.,University of New Mexico |
Xu F.,University of New Mexico |
Min-Allah N.,COMSATS Institute of Information Technology |
Khodeir M.,JUST |
And 3 more authors.
IEEE Communications Letters | Year: 2012
Network service recovery from multiple correlated failures is a major concern given the increased level of infrastructure vulnerability to natural disasters, massive power failures, and malicious attacks. To properly address this problem, a novel path protection solution is proposed to jointly incorporate traffic engineering and risk minimization objectives. The framework assumes probabilistic link failures and is evaluated against some existing multi-failure recovery schemes using network simulation. © 2012 IEEE.
Al-Rousan N.,Taibah University |
Al-Rousan M.,JUST |
2012 International Conference on Renewable Energy Research and Applications, ICRERA 2012 | Year: 2012
Renewable energy is the energy that comes from natural resources and it is the energy that naturally replenished and can be converted from a form to another to be useful for human usage. Solar energy is one form of renewable energy that can be obtained from sun through the form of solar radiation. It is a promising alternative technology that will help to replace petroleum energy sources. However, there are many problems to use such as technology which limits the produced energy. The major problem is the poor efficiency of solar cells and the high cost. Tracking systems are used to maximize electricity output of solar cells. However, this is not a naive task due to the difficulty in finding a general rule that can be used to get optimal output of solar cells for all situations. Moreover, different environments may affect the output of solar cells. Artificial Intelligence could be used to control these parameters for better efficiency. So; the aim of this paper is to introduce an efficient tracking model for the solar panel set that maximizes the energy output of the solar system in the area of Jordan and its neighbors based on practical experiment. The proposed fuzzy model was experimentally evaluated to demonstrate that this system can successfully predict the correct angles with superior results when it provides any average low error rate of 3.55% for predicted tilt angles and 4.1% degrees for predicted orientation angles. This low predicted error indicates that the system can be used efficiently in Jordan and its neighbors to predict the directions to collect the maximum power. © 2012 IEEE.
Haddad B.,University of Jordan |
Journal of Circuits, Systems and Computers | Year: 2013
Recent demand for low power VLSI circuits has been pushing the development of innovative approaches to reduce power dissipation. Supply voltage (V CC) and switching activity factor (α) are main sources of dynamic power dissipation in CMOS technology. Furthermore, the power dissipation increases exponentially by the value of supply voltage. New approach based on switching activity analysis and multiple supply voltage is implemented successfully in logical circuits, taking in mind the critical path(s) of the design and switching activity factor of each element in the design. High supply voltage is applied on elements on the critical path(s). Elements off the critical path(s) are classified into categories according to their switching activity factors. The total power dissipation is reduced, while the propagation delay remains without any increase. The proposed approach combines the concepts of critical/non-critical paths and switching activity analysis to assign different VCCs to different elements. © 2013 World Scientific Publishing Company.
Alawneh A.,Qatar University |
Alrefaei M.,JUST |
Diabat A.,United Arab Emirates University |
Al-Aomar R.,United Arab Emirates University |
Faisal M.N.,Qatar University
Lecture Notes in Engineering and Computer Science | Year: 2014
In this research, we have developed a linear programming formulation to describe Qatar steel manufacturing supply chain from suppliers to consumers. The purpose of the model is to provide answers regarding the optimal amount of raw materials to be requested from suppliers, the optimal amount of finished products to be delivered to each customer and the optimal inventory level of raw materials. The model is validated and solved using GAMS software. Sensitivity analysis on the proposed model is conducted in order to draw useful conclusions regarding the factors that play the most important role in the efficiency of the supply chain.
Hamdan M.A.,University of Jordan |
Al-Nimr M.A.,J.U.S.T. |
Hammoudeh V.A.,University of Jordan
Journal of Fluids Engineering, Transactions of the ASME | Year: 2010
In this work, the effect of the second-order term to the velocityslip/temperature-jump boundary conditions on the solution of four cases in which the driving force is fluctuating harmonically was studied. The study aims to establish criteria that secure the use of the first order velocity-slip/temperature-jump model boundary conditions instead of the second-order ones. The four cases studied were the transient Couette flow, the pulsating Poiseuille flow, Stoke's second problem, and the transient natural convection flow. It was found that at any given Kn number, increasing the driving force frequency, increases the difference between the first and second-order models. Assuming that a difference between the two models of over 5% is significant enough to justify the use of the more complex second-order model, the critical frequencies for the four different cases were found. For the cases for which the flow is induced by the fluctuating wall as in cases 1 and 3, we found that critical frequency at Kn=0.1 to be ω=8. For the cases of flow driven by a fluctuating pressure gradient as in case 2, this frequency was found to be ω = 1, at the same Kn number. In case 4, for the temperature-jump model, the critical frequency was found to beω = 7 and for the velocity-slip model the critical frequency at the same Kn number was found to be ω = 1.35. Copyright © 2010 by ASME.
Karasneh J.,Jordan University of Science and Technology |
Bani-Hani M.,JUST |
Alkhateeb A.,JUST |
Hassan A.,University of Baghdad |
And 2 more authors.
Journal of Oral Pathology and Medicine | Year: 2015
Background: Recurrent aphthous stomatitis (RAS) is an inflammatory disease induced by genetic and environmental factors. Toll-like receptor (TLR) and CD86 are essential components for innate immunity and cellular immune response. We aimed to determine whether inheritance of specific TLR2, TLR4and CD86 gene polymorphisms are associated with RAS. Methods: Ninety-six patients with RAS and 153 controls were studied. Eight SNPs were genotyped using PCR-RFLP technique; four in TLR2 gene: rs4696480, rs3804100, rs121917864, rs5743708; three in TLR4 gene: rs10759931, rs4986790 rs1927911; and one in CD86 gene rs17281995. Association was assessed by logistic regression analysis. Linkage disequilibrium (LD) was assessed using the Haploview program. Results: Significant increase in inheritance of A allele (OR = 1.6, P = 0.01) and AA genotype (OR = 3.89, P = 0.01) of TLR4 rs10759931 was observed in cases. TLR4rs1927911 C allele and CC genotype were also increased (OR = 1.60 and 2.78 respectively); however, this was not statistically significant (P = 0.02 and 0.03 respectively). TLR2 and CD86 did not show association with RAS. Conclusions: This is the first study to investigate the association of TLR and CD86 with RAS. We found a significant association between TLR4 rs10759931 polymorphism and RAS. Confirmatory studies in other populations and functional investigations are needed to determine the role of TLR4 in RAS. © 2015 John Wiley & Sons A/S.
Alkhateeb A.,Jordan University of Science and Technology |
Karasneh J.,JUST |
Abbadi H.,Jordan University of Science and Technology |
Hassan A.,University of Baghdad |
Thornhill M.,University of Sheffield
Journal of Oral Pathology and Medicine | Year: 2013
Background: Recurrent aphthous stomatitis (RAS) is a common oral ulcerative condition. At ulcer sites vascular adhesion molecule-1 (VCAM-1), E-selectin and intercellular adhesion molecule-1 (ICAM-1) are strongly expressed on blood vessels, and ICAM-1 is expressed on keratinocytes. Expression of these molecules would promote leukocyte accumulation and invasion of the epithelium. Thus, polymorphisms in these candidate genes might contribute to RAS susceptibility. We investigated whether the inheritance of specific selectin, ICAM and VCAM gene polymorphisms is associated with RAS susceptibility. Methods: Ninety-six RAS cases and 153 controls were recruited from a Jordanian population. Blood was collected for hematological investigations and genotyping. Six SNPs were genotyped: E-selectin rs5361 and rs1805193, L-selectin, rs2205849, ICAM-1 rs5498, ICAM-5 rs885743 and VCAM-1 rs1800821. Association was determined using chi-square and binary logistic regression analysis after correcting for confounding factors. Linkage disequilibrium was determined using the EH program, and the Phase 2.1 program was used to construct and compare haplotypes between cases and controls. Results: There was a significant association of the A allele (Pcorr = 0.027), AA and AC genotypes (OR = 10.9 and 9.0, respectively) of the E-selectin rs5361 gene polymorphism and TAA haplotype (rs2205849, rs5361, and rs1805193, respectively; P = 0.03) with RAS. None of the other SNPs showed a significant association. Conclusions: This is the first report to link inheritance of the A allele, AA and AC genotypes of the E-selectin rs5361 polymorphism with increased risk of RAS. Further studies in different patient cohorts are needed to confirm the association, and functional analyses might clarify the biological significance of the association. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Just | Date: 2015-11-06
Computer software to enable uploading, downloading, accessing, posting, displaying, and otherwise providing electronic media and information related to the fashion industry via computer and communication networks; computer software for accessing, browsing and searching online databases related to the fashion industry.