Beirut, Lebanon

Beirut Arab University
Beirut, Lebanon

Beirut Arab University is a Lebanese private university located in Beirut, Lebanon. It was founded by the Lebanese El-Bir and Ihsan Society in 1960. The university is officially accredited according to article of the Lebanese Higher Education Law issued on 26 December 1961.Beirut Arab University is a member of:Association of Arab Universities International Association of Universities Federation of the Universities of the Islamic World Agence Universitaire de la Francophonie :Conférence des Recteurs de la Région du Moyen-OrientRéseau International Francophone des établissements de formation de formateurs Ecole Doctorale de Droit du Moyen- Orient Collège Doctoral de Français au Moyen Orient International Association of University Presidents Association of Universities of LebanonEuro- Mediterranean University Euromed Permanent University Forum International Council for Open and Distance EducationInternational Federation of Library Associations and InstitutionsArab Association of Collegiate Registrars& Admissions Officers Association of the Arab Faculties of Dentistry Scientific Association of Colleges of Pharmacy in the Arab World Arab Society of Faculties of Business Administration Union of International Associations Scientific Society of Arab Nursing Faculties Islamic Universities LeagueUnited Nations Global CompactAssociation for Dental Education in Europe Arab Forum for Environment and Development Lebanese Academic Library Consortium European Foundation for Management and Development ↑ Wikipedia.

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Yaacoub E.,Beirut Arab University
2016 IEEE Middle East Conference on Antennas and Propagation, MECAP 2016 | Year: 2016

Kerchoff's principle states that the security of encryption should be based on the key. Thus, increasing the encryption key length has been an essential approach in generating unbreakable ciphers. Recently, physical layer security has gained significant research attention. It allows secure communications between a source and destination without the need to resort to key-based encryption techniques. In this paper, secret key generation using massive multiple input multiple output (MIMO) techniques is investigated. The large number of subcarriers used in orthogonal frequency division multiple access (OFDMA) systems is also used to increase the key length. Several scenarios are investigated and corresponding key lengths are calculated. The combination of massive MIMO and OFDMA also allows to simultaneously implement physical layer security techniques while generating large keys for traditional key-based cryptography. © 2016 IEEE.

Kasti N.A.,Beirut Arab University
Solar Energy | Year: 2017

In some parts of the globe, solar energy is available throughout the year. In areas where the terrain is mostly flat, it is justifiable to use solar power in the automotive industry. Previous publication explored the concept of a solar-battery car with single and double solar array-trailers. Solar array-trailers maximize the acquired solar energy thereby minimizing the use of battery power. The resulting excess power derived from solar-trailers can be used to drive the car and accessories that are necessary in some parts of the world. Building on previously published results, this paper aims to determine the applicable limits of the car-trailer concept. Variations to the reference configuration are considered, and the corresponding battery power needed is calculated. Upper limits to the drag area coefficient, ground inclination, and rolling resistance are established. Furthermore, an effective rolling resistance factor for the trailer is determined since manufacturing imperfections, component flexibilities and the misalignments of trailers limit the applicability of the car-trailer system. The use of trailers is not justifiable for an effective rolling resistance factor less than one. An ideal environment for the application of solar-battery cars, on a global scale, may be the drive across the Australian continent along the Stuart Highway/Highway1. Such a drive is used by the World Solar Challenge to assess the performance of various categories of solar cars. A similar track is used in this publication to assess the response of solar-battery cars with solar-trailers. Cumulative as well as daily energies required for such a drive are reported for a car, and a car with trailers. Furthermore, the response under clear/cloudy conditions, throughout the year, is discussed. The results are compared with energies required by a typical ‘race’ car. The paper concludes with a summary of the results. © 2017 Elsevier Ltd

Yaacoub E.,Beirut Arab University
Annales des Telecommunications/Annals of Telecommunications | Year: 2017

In this paper, a system of femtocells controlled by a single controller is investigated. In such a scenario, femtocell access points (FAPs) are assumed connected via wired links to a central controller within a certain vicinity (e.g., building, compound, hotel, and campus.). Thus, radio resource management (RRM) and green network operation of LTE femtocell networks are investigated in an integrated wired/wireless system. Consequently, it becomes possible to perform RRM in a centralized and controlled way in order to enhance the quality of service (QoS) performance for the users in the network. Furthermore, energy-efficient operation consisting of switching off redundant FAPs can be implemented. A utility maximization framework is presented, and an RRM algorithm that can be used to maximize various utility functions is proposed. Another algorithm is presented for the scenario of FAP on/off switching to achieve green operation. It consists of selecting the best FAP to switch off, then moving the femto user equipments (FUEs) to other active FAPs without compromising their quality of service (QoS). Simulation results show that the proposed algorithms lead to significant performance gains. © 2017 Institut Mines-Télécom and Springer-Verlag France

Ibrahim T.,Sudan University of Science and Technology | Itani A.,Beirut Arab University | Nath P.,Northeastern University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

We give a quantitative analysis of the electric dipole moments as a probe of high scale physics. We focus on the electric dipole moment of the electron since the limit on it is the most stringent. Further, theoretical computations of it are free of QCD uncertainties. The analysis presented here first explores the probe of high scales via electron electric dipole moment (EDM) within minimal supersymmetric standard model where the contributions to the EDM arise from the chargino and the neutralino exchanges in loops. Here it is shown that the electron EDM can probe mass scales from tens of TeV into the PeV range. The analysis is then extended to include a vectorlike generation which can mix with the three ordinary generations. Here new CP phases arise and it is shown that the electron EDM now has not only a supersymmetric (SUSY) contribution from the exchange of charginos and neutralinos but also a nonsupersymmetric contribution from the exchange of W and Z bosons. It is further shown that the interference of the supersymmetric and the nonsupersymmetric contribution leads to the remarkable phenomenon where the electron EDM as a function of the slepton mass first falls and become vanishingly small and then rises again as the slepton mass increases. This phenomenon arises as a consequence of cancellation between the SUSY and the non-SUSY contribution at low scales while at high scales the SUSY contribution dies out and the EDM is controlled by the non-SUSY contribution alone. The high mass scales that can be probed by the EDM are far in excess of what accelerators will be able to probe. The sensitivity of the EDM to CP phases both in the SUSY and the non-SUSY sectors are also discussed. © 2014 American Physical Society.

El Arwadi T.,Beirut Arab University
Numerical Functional Analysis and Optimization | Year: 2012

In 1996, Nachman introduced the D-bar method to reconstruct a planar conductivity from the electrical measurements at the boundary. His method consists of two steps: 1) using the boundary data to calculate the scattering transform (this is severely ill-posed) and 2) computing the conductivity by solving a -equation in the frequency space and evaluate at zero frequency. Siltanen et al. propose to replace step 1 by the (well-posed) calculation of some approximate scattering transforms. In this article, we prove estimates (at large frequency) of these approximate scattering transforms and study the error in the reconstructed conductivity when using them. Copyright © Taylor & Francis Group, LLC.

Objective: The aim of this study was to investigate the effect of Nigella sativa and thymoquinone (TQ) on oxidative stress, cyclooxygenase-2 (COX-2), and intracellular adhesion molecule-1 mRNA expression in the pancreas of streptozotocin (STZ)-induced diabetic rats as a model of type 1 diabetes. Methods: Five experimental groups including control group, STZ-induced diabetic group, aqueous extract diabetic treated group, oil diabetic treated group, and TQ diabetic treated group were used to obtain the pancreatic tissue samples and serum for investigation. Results: A significant increase in COX-2 mRNA expression was detected in STZ-induced diabetic group after 10 days of diabetes induction indicating an important role of the enzyme COX-2 in the inflammation accompanying STZ diabetes in contrast to that detected for intracellular adhesion molecule-1. Treatment of STZ diabetic rats with N. sativa aqueous extract and TQ significantly suppressed the expression of COX-2 enzyme in the pancreatic tissue. Nigella sativa and TQ treatment also suppressed pancreatic tissue lipid peroxidation malon-dialdehyde levels and increased the level of superoxide dismutase antioxidant enzyme correlated with the decrease in COX-2 mRNA expression. Conclusions: Results obtained in this study support a potential role for N. sativa and TQ in ameliorating inflammation during diabetes and preserving A cells. Copyright © 2013 by Lippincott Williams & Wilkins.

Nasser S.A.,Beirut Arab University | El-Mas M.M.,Alexandria University
European Journal of Pharmacology | Year: 2014

Since the discovery of the endothelin system in 1988, it has been implicated in numerous physiological and pathological phenomena. In the cardiovascular system, endothelin-1 (ET-1) acts through intracellular pathways of two endothelin receptors (ETA and ETB) located mainly on smooth muscle and endothelial cells to regulate vascular tone and provoke mitogenic and proinflammatory reactions. The endothelin ETA receptor is believed to play a pivotal role in the pathogenesis of several cardiovascular disease including systemic hypertension, pulmonary arterial hypertension (PAH), dilated cardiomyopathy, and diabetic microvascular dysfunction. Growing evidence from recent experimental and clinical studies indicates that the blockade of endothelin receptors, particularly the ETA subtype, grasps promise in the treatment of major cardiovascular pathologies. The simultaneous blockade of endothelin ETB receptors might not be advantageous, leading possibly to vasoconstriction and salt and water retentions. This review summarizes the role of ET-1 in cardiovascular modulation and the therapeutic potential of endothelin receptor antagonism. © 2014 Elsevier B.V.

Abdel-Rahman A.,Beirut Arab University
WSEAS Transactions on Fluid Mechanics | Year: 2010

On the basis of available knowledge, it is shown that different mechanisms may have control in different jet flows or in different regions of a jet flow. In free jet flows, the downstream region is dominated by turbulence structure whereas coherent eddy-structure can have a strong influence on the near field, particularly for low-Reynolds number jet flows. At present, however, it has become a common belief that coherent-eddy structures determine, to a large degree, the evolution and dynamics of turbulent jet flows. The following article is an attempt to review the current information on round turbulent jet flows. In so doing, the influence of the jet origin (initial conditions) and the boundary conditions (presence or absence of endplate, side walls, and/or jet enclosure) on the jet flow structure is considered.

Hypoxia-mediated regulation of N-methyl-D-aspartate (NMDA) receptor (NMDAR) is phenomenal. NMDAR is no doubt an intriguing paradoxical glutamate receptor (GLUR) with versatile actions. GLURs play a pivotal role in brain physiology and pathophysiology under ischemia and oxygen deprivation, where NMDARs are major contributors. Activation of NMDARs is closely associated with the kinetics of intracellular calcium (Ca +) release, a main player in neuronal cell death in the central nervous system (CNS). However, CNS exposure to hypoxia modulates NMDAR/Ca + physiology in such a way that there is a small window of operating neuroprotection, rather than the classical neuroinjurious effects manifested upon Ca + release. The NMDAR connection with hypoxia-inducible factor-1a (HIF-1a), a transcription factor considered master regulator of oxygen sensing mechanisms, is not well established in the CNS. However, scanning the literature yielded a wealth of NMDAR/hypoxia connection but that with HIF-1a is not prominent. It is worth mentioning that this is not a comprehensive review on the effect of hypoxia on NMDAR physiology, rather this synopsis sheds light on the putative mechanisms involving HIF-1a and NMDAR regulation. Understanding the evidence of this intimate connection and its ramifications may bear potential applications in unraveling hypoxia-mediated injury, neuronal cell death and, most importantly, adaptive, neuroprotective mechanisms to oxygen deprivation. © 2013 Bentham Science Publishers.

Assaad J.J.,Notre Dame University - Louaize | Daou Y.,Beirut Arab University
Cement and Concrete Research | Year: 2014

The injection of cementitious-based grouts by vacuum pressure techniques is expected to extract part of the mixing water with direct consequences on the fresh and hardened properties. A research program was undertaken to evaluate the effect of vacuuming on the amount of water extracted along with resulting changes in grout properties including flowability, static yield stress, viscosity, unit weight, Wick-induced bleeding, and compressive strength. Tests were conducted using specimens sampled right after mixing as well as after being subjected to vacuum. Test results have shown that the extraction of water decreases fluidity (i.e., flow time and mini-slump cone) and increases the magnitude of yield stress and viscosity, mostly due to increased internal friction and cohesion within the solid particles. Grouts prepared with low water-to-cementitious materials ratio and containing moderate to high concentrations of viscosity-modifying admixtures yielded adequate water retentivity, with minor variations in rheological and hardened properties. © 2014 Elsevier Ltd.

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