Browsing Department of Physics by Title

Now showing items 137-156 of 164

The case of HD 106906 debris disc: a binary's revenge

Farhat, Mohammad A.; Sefilian, Antranik A.; Touma, Jihad R. (Oxford University Press, 2023)

Debris disc architecture presents [exo-]planetary scientists with precious clues for processes of planet formation and evolution, including constraints on planetary mass perturbers. This is particularly true of the disc ...
The contribution of surfaces and interfaces to the crystal thermal conductivity

Kazan, Michel; Masri, Pierre M. (Elsevier B.V., 2014)

This review provides theoretical understanding of the role of the surface and interface in the thermal conductivity of solids. An attempt is made to collect the various methods used in the analysis of experiments. The ...
The disruption of multiplanet systems through resonance with a binary orbit

Touma, Jihad R.; Sridhar, S. (Nature Publishing Group, 2015)

Most exoplanetary systems in binary stars are of S-type, and consist of one or more planets orbiting a primary star with a wide binary stellar companion. Planetary eccentricities and mutual inclinations can be large, perhaps ...
The dynamics of two-dimensional turbulence excited at two scales using electromagnetic forces

Habchi, Charbel; Antar, Ghassan Y. (American Institute of Physics Inc., 2016)

Several forcing scales can co-exist in nature leading and affecting turbulent flows. This is not critical in three-dimensional systems where only a direct cascade of energy exists, but it is a concern in two dimensions ...
The effect of adding an axial magnetic field on the expansion of a laser-produced plasma

Antar, Ghassan Y.; Bahja, A.; Metni, Najib A.; Habchi, Charbel (American Institute of Physics Inc., 2019)

We use a pulsed ultraviolet laser to ablate a copper target in order to study the effects of adding a permanent and axial magnetic field on the plasma plume expansion. The laser pulse duration is 20 ns, its energy is 150 ...
The effect of graphene flake size on the properties of graphene-based polymer composite films

Tarhini, Ali A.; Tehrani-Bagha, A. R.; Kazan, Michel; Grady, Brian Patrick (John Wiley and Sons Inc, 2021)

In this work, the role of graphene flake size on the properties of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) composites was studied. Graphene flakes were added to PVDF-HFP using a solution mixing and ...
The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

Awad, Ramadan; Mohammed, N. H.; Abou-Aly, Aly Ibrahim; Isber, Samih; Motaweh, Hussien A.; El-Said Bakeer, Douaa; Roumié, Mohamad (Tsinghua University, 2016)

Superconductor samples of type (CoFe2O4)xGdBa2Cu3O7-δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe2O4 was prepared by co-precipitation method with grain size of about ...
The effect of temperature on the electrical and thermal conductivity of graphene-based polymer composite films

Tarhini, Ali A.; Alchamaa, M. Walid; Khraiche, Massoud Louis; Kazan, Michel; Tehrani-Bagha, A. R. (John Wiley and Sons Inc, 2022)

In this work, we studied the effect of temperature on the electrical, thermal, and mechanical properties of graphene-based poly(vinylidene fluoride-co-hexafluoropropylene) composites. Graphene-based polymer composites ...
The Polaris Linear Plasma Device

Antar, Ghassan Y.; Younes, Joan; Darwish, Marwan S.; Costantine, Joseph; Roumié, Mohamad; Habchi, Charbel (Institute of Electrical and Electronics Engineers Inc., 2021)

We report the construction of Polaris, a new linear plasma device with an axial magnetic field dedicated to research and education at the American University of Beirut in Lebanon. The goal is to initiate the investigation ...
The potential of urban distributed solar energy in transition economies: The case of Beirut city

Eslami, Hossein; Najem, Sara A.; Abi Ghanem, Dana; Ahmad, Ali (Academic Press, 2021)

In this paper, using Lebanon's capital, Beirut, as a case study, a methodology is proposed to assess the potential for solar photovoltaics (PV) in urban areas incorporating both economic and non-economic factors. Utilizing ...
The properties of the tungsten coating on fine grain graphite using pulsed laser deposition

Antar, Ghassan Y.; Ali, J.; Madi, Charbel S.; Noun, Manale; Rohde, Volker; Roumié, Mohamad; Said, A. J.; Younes, Joan (Elsevier Ltd, 2019)

The advantages of using a high-Z material as a plasma facing component (PFC) in fusion devices is now admitted, consequently, the International Thermonuclear Experimental Reactor (ITER) will have a solid tungsten divertor. ...
The Rarity of Very Red Trans-Neptunian Objects in the Scattered Disk

Ali-Dib, Mohamad; Marsset, Michael; Wong, Wingcheung; Dbouk, Rola (American Astronomical Society, 2021)

We investigate the origins of the photometrically very red (VR) and less red (LR) trans-Neptunian objects (TNOs). We first reanalyze the data set of Marsset et al. and find that in addition to the known color-inclination ...
The role of the 1.5 order formalism and the gauging of spacetime groups in the development of gravity and supergravity theories

Chamseddine, Ali H.; West, Peter C. (World Scientific, 2022)

The 1.5 formalism played a key role in the discovery of supergravity and it has been used to prove the invariance of essentially all supergravity theories under local supersymmetry. It emerged from the gauging of the super ...
The role of the plasma current in turbulence decrease during lower hybrid current drive

Antar, Ghassan Y.; Ekedahl, Annika C.; Goniche, Marc; Asghar, A.; Žáček, František (American Institute of Physics Inc., 2017)

The interaction of radio frequency (RF) waves with edge turbulence has resurfaced after the results obtained on many tokamaks showing that edge turbulence decreases when the ion cyclotron frequency heating (ICRH) is switched ...
The spontaneous breaking of axisymmetry in shallow rotating flows

Antar, Ghassan Y.; Lalti, Ahmad; Habchi, Charbel (American Institute of Physics Inc., 2019)

We show that the axial symmetry of a shallow rotating flow is spontaneously broken in the absence of an externally forced velocity gradient. It is caused by an instability excited by the gradients that arise from the ...
The statistical mechanics of self-gravitating Keplerian discs

Touma, Jihad R.; Tremaine, Scott D. (Institute of Physics Publishing, 2014)

We describe the dynamics and thermodynamics of collisionless particle discs orbiting a massive central body, in the case where the disc mass is small compared to the central mass, the self-gravity of the disc dominates the ...
Transition from surface phonon-polariton to surface phonon-plasmon-polariton by thermal injection of free carriers

El-Helou, Youssef; Wu, Kuanting; Bruyant, Aurélien; Woon, Wei Yen; Kazan, Michel (IOP Publishing Ltd, 2022)

Surface phonon-polariton, surface plasmon-polariton, and surface phonon-plasmon-polariton are evanescent electromagnetic waves confined to the surfaces of different classes of materials, which gives each of them particular ...
Transport properties of thermoplastic R-BAPB polyimide: Molecular dynamics simulations and experiment

Volgin, Igor V.; Andreeva, Maria V.; Larin, Sergey V.; Didenko, Andrey L.; Vaganov, Gleb V.; Borisov, Il'ya L.; Volkov, Alexey Vladimirovich; Klushin, Leonid I.; Lyulin, Sergey V. (MDPI AG, 2019)

Thepresentwork evaluates the transportproperties of thermoplasticR-BAPBpolyimide based on 1,3-bis(3,30,4,40-dicarboxyphenoxy)benzene (dianhydride R) and 4,40-bis(4-aminophenoxy)biphenyl (diamine BAPB). Both experimental ...
Tuning electrical and thermal conductivities of the two-dimensional electron gas in AlN/GaN heterostructures by piezoelectricity

Abou-Hamdan, Loubnan; Hamyeh, S.; Iskandar, A.; Tauk, Rabih; Brault, Julien; Tabbal, Malek; Adam, Pierre Michel; Kazan, Michel (IOP Publishing Ltd, 2020)

We investigate the electrical and thermal conductivities of the two-dimensional electron gas (2DEG) confined in the quantum well formed at the heterojunction between a thin GaN layer and an AlN layer strained by an Al x ...
Tuning the infrared dielectric and plasmonic properties of ZnO thin films on glass

Bozoian, S.; Kalaydjian, L.; Younes, Joan; Tabbal, Malek; Kazan, Michel (Elsevier B.V., 2023)

Infrared reflectivity measurements are performed on c-axis oriented zinc oxide thin films deposited on glass by the pulsed laser deposition technique at 350 °C and 700 °C and for different deposition times to examine the ...

Now showing items 137-156 of 164

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Browsing Department of Physics by Title

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