AUB ScholarWorks

Browsing Department of Physics by Title

Browsing Department of Physics by Title

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  • Phantom space-times in fake supergravity 
    Bu Taam, Maryam; Sabra, Wafic A. (Elsevier, 2015)
    We discuss phantom metrics admitting Killing spinors in fake N= 2, D= 4 supergravity coupled to vector multiplets. The Abelian U(1) gauge fields in the fake theory have kinetic terms with the wrong sign. We solve the Killing ...
  • Phase transitions in single macromolecules: Loop-stretch transition versus loop adsorption transition in end-grafted polymer chains 
    Zhang, Shuangshuang; Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Yan, Dadong; Schmid, Friederike (American Institute of Physics Inc., 2018)
    We use Brownian dynamics simulations and analytical theory to compare two prominent types of single molecule transitions. One is the adsorption transition of a loop (a chain with two ends bound to an attractive substrate) ...
  • Phonon heat transport in superlattices: Case of Si/SiGe and SiGe/SiGe superlattices 
    Hijazi, M.; Kazan, Michel (American Institute of Physics Inc., 2016)
    We present a predictive Boltzmann model for the cross-plane thermal conductivity in superlattices. The developed model considers particle-like phonons exhibiting wave characteristics at the interfaces and makes the assumption ...
  • Picosecond laser beam nanostructuring of GDC thin films: exchange surface enhancement by LIPSS 
    Karim, Wael; Petit, Agnès; Rabat, Hervè; Tabbal, Malek; Thomann, Anne Lise; Semmar, Nadjib (Springer Science and Business Media Deutschland GmbH, 2022)
    In ceramic electrochemical cells, gadolinium-doped ceria (GDC) thin film is deposited between the electrolyte (yttria-stabilized zirconia, YSZ) and the upper electrode to improve the aging resistance. Increasing the interface ...
  • PIXE contribution for a database of Phoenician pottery in Lebanon 
    Roumié, Mohamad; Oggiano, Ida; Reslan, A.; Srour, Ali; El-Morr, Ziad; Castiglione, Marianna; Tabbal, Malek; Korek, Mahmoud; Nsouli, Bilal (Elsevier B.V., 2019)
    The study the ancient Phoenician cult place of Kharayeb, in the rural hinterland of Tyre, southern of Lebanon, dated to the Iron Age and Hellenistic periods is particularly helpful in evaluating the complexity and variability ...
  • Plasmonic mode interferences and Fano resonances in Metal-Insulator- Metal nanostructured interface 
    Nicolas, Rana; Lévêque, Gaëtan; Marae-Djouda, Joseph; Montay, Guillaume; Madi, Yazid; Plain, Jérôme; Herro, Ziad G.; Kazan, Michel; Adam, Pierre Michel; Maurer, Thomas (Nature Publishing Group, 2015)
    Metal-insulator-metal systems exhibit a rich underlying physics leading to a high degree of tunability of their spectral properties. We performed a systematic study on a metal-insulator-nanostructured metal system with a ...
  • Polydisperse Brush with the Linear Density Profile 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Qi, Shuanhu; Schmid, Friederike (Pleiades Publishing, 2018)
    Macromolecules densely end-grafted to a planar solid surface form a polymer monolayer (brush). It is known that, in a good solvent, the density profile of monodisperse brushes parabolically decays on moving away from the ...
  • Polydisperse Polymer Brushes: Internal Structure, Critical Behavior, and Interaction with Flow 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Schmid, Friederike (American Chemical Society, 2016)
    We study the effect of polydispersity on the structure of polymer brushes by analytical theory, a numerical self-consistent field approach, and Monte Carlo simulations. The polydispersity is represented by the Schulz-Zimm ...
  • Polydispersity Effects on Interpenetration in Compressed Brushes 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Qi, Shuanhu; Kreer, Torsten; Schmid, Friederike (American Chemical Society, 2019)
    We study the effect of polydispersity on the compression and interpenetration properties of two opposing polymer brushes by numerical self-consistent field approach and by analytical theory. Polydispersity is represented ...
  • Polymer brushes with reversibly tunable grafting density 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Ivanova, Anna S.; Schmid, Friederike (American Institute of Physics Inc., 2021)
    We propose a novel class of responsive polymer brushes, where the effective grafting density can be controlled by external stimuli. This is achieved by using end-grafted polymer chains that have an affinity to the substrate. ...
  • Quanta of geometry and unification 
    Chamseddine, Ali H. (World Scientific Publishing Co. Pte Ltd, 2016)
    This is a tribute to Abdus Salam's memory whose insight and creative thinking set for me a role model to follow. In this contribution I show that the simple requirement of volume quantization in spacetime (with Euclidean ...
  • Quanta of geometry: Noncommutative aspects 
    Chamseddine, Ali H.; Connes, Alain; Mukhanov, Viatcheslav F. (American Physical Society, 2015)
    In the construction of spectral manifolds in noncommutative geometry, a higher degree Heisenberg commutation relation involving the Dirac operator and the Feynman slash of real scalar fields naturally appears and implies, ...
  • Raman measurement of the effect of lattice defects on the two-phonon density of states in ZnO 
    Nour-Al-Deen, Ibrahim; El-Kurdi, Riham; Patra, Digambara; Kazan, Michel (John Wiley and Sons Ltd, 2021)
    The resonance of the (Formula presented.) mode of the zinc oxide (ZnO) lattice occurs near a ridge-like structure of the two-phonon density of states (DOS). The renormalization of the harmonic frequency of the (Formula ...
  • Random spacing between metal tree electrodeposits in linear DLA arrays 
    Tannous, Jaad; Anouti, Lina; Sultan, Rabih F. (MDPI AG, 2018)
    When we examine the random growth of trees along a linear alley in a rural area, we wonder what governs the location of those trees, and hence the distance between adjacent ones. The same question arises when we observe ...
  • Real Killing spinors in neutral signature 
    Gutowski, Jan B.; Sabra, Wafic A. (Springer, 2019)
    Spinorial geometry methods are used to classify solutions admitting Majorana Killing spinors of the minimal 4-dimensional supergravity in neutral signature, with van- ishing cosmological constant and a single Maxwell field ...
  • Resolving cosmological singularities 
    Chamseddine, Ali H.; Mukhanov, Viatcheslav F. (Institute of Physics Publishing, 2017)
    We find a simple modification of the longitudinal mode in General Relativity which incorporates the idea of limiting curvature. In this case the singularities in contracting Friedmann and Kasner universes are avoided, and ...
  • Scalar curvature in discrete gravity 
    Chamseddine, Ali H.; Malaeb, O.; Najem, Sara A. (Springer Science and Business Media Deutschland GmbH, 2022)
    We focus on studying, numerically, the scalar curvature tensor in a two-dimensional discrete space. The continuous metric of a two-sphere is transformed into that of a lattice using two possible slicings. In the first, we ...
  • Secular instabilities of Keplerian stellar discs 
    Kaur, Karamveer; Kazandjian, Mher V.; Sridhar, S.; Touma, Jihad R. (Oxford University Press, 2018)
    We present idealized models of a razor-thin, axisymmetric, Keplerian stellar disc around a massive black hole, and study non-axisymmetric secular instabilities in the absence of either counter-rotation or loss cones. These ...
  • Selective Colloid Transport across Planar Polymer Brushes 
    Laktionov, Mikhail Y.; Zhulina, Ekaterina B.; Klushin, Leonid I.; Richter, Ralf P.; Borisov, Oleg V. (John Wiley and Sons Inc, 2023)
    Polymer brushes are attractive as surface coatings for a wide range of applications, from fundamental research to everyday life, and also play important roles in biological systems. How colloids (e.g., functional nanoparticles, ...
  • Sharp and fast: Sensors and switches based on polymer brushes with adsorption-active minority chains 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Qi, Shuanhu; Schmid, Friederike (American Physical Society, 2014)
    We propose a design for polymer-based sensors and switches with sharp switching transition and fast response time. The switching mechanism involves a radical change in the conformations of adsorption-active minority chains ...

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