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Browsing Department of Physics - Faculty Publications by Issue Date

Browsing Department of Physics - Faculty Publications by Issue Date

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  • Effect of process parameters on the mechanical properties of carbon nitride thin films synthesized by plasma assisted pulsed laser deposition 
    Tabbal M.; Merel P.; Chaker M. (, 2004)
    We present an investigation of the effect of the process parameters, namely deposition pressure and laser intensity, on the growth and mechanical properties of carbon nitride (CNX) thin films synthesized by plasma assisted ...
  • Graphitic nanoclustering in pulsed laser deposited diamond-like-carbon and carbon nitride thin films 
    Tabbal M.; Christidis T.; Isber S.; El Khakani M.A.; Merel P.; Chaker M. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2004)
    In this work, Raman spectroscopy and electron paramagnetic resonance (EPR) are used to investigate sp2 carbon atoms nanoclustering in both diamond-like-carbon (DLC) and amorphous carbon nitride (CNx) films grown at room ...
  • Charged configurations in (A)dS spaces 
    Liu J.; Sabra W.A. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2004)
    We construct new backgrounds of d-dimensional gravity with a negative cosmological constant coupled to a m-form field strength. We find a class of magnetically charged anti-de Sitter black holes with m-dimensional Einstein ...
  • Temperature dependence of the electron paramagnetic resonance of unhydrogenated carbon nitride 
    Christidis T.; Tabbal M.; Isber S.; Rizk S. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2004)
    Temperature-dependent electron paramagnetic resonance (EPR) and conductivity measurements were performed on unhydrogenated amorphous carbon nitride (a-CNx) thin films in an attempt to investigate electronic transport ...
  • Consistent reductions of IIB*-M* theory and de Sitter supergravity 
    Liu J.T.; Wen W.-Y.; Sabra W.A. (NEW YORK233 SPRING ST, NEW YORK, NY 10013 USA, 2004)
    We construct consistent non-linear Kaluza Klein reduction ansatze for a subset of fields arising from the reduction of IIB* and M* theory on dS5 × H5 and dS4 × AdS 7, respectively. These reductions yield four and ...
  • Matrix gravity and massive colored gravitons 
    Chamseddine A.H. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2004)
    We formulate a theory of gravity with a matrix-valued complex vierbein based on the SL(2N, ℂ) ⊗8 SL(2N, ℂ) gauge symmetry. The theory is metric independent, and before symmetry breaking all fields are massless. The symmetry ...
  • Evolution of massive stars up to the end of central oxygen burning 
    El Eid M.F.; Meyer B.S.; The L.-S. (Institute of Physics Publishing; CHICAGO1427 E 60TH ST, CHICAGO, IL 60637-2954 USA, 2004)
    We present a detailed study of the evolution of massive stars of masses 15, 20, 25, and 30 M⊙ assuming solar-like initial chemical composition. The stellar sequences were evolved through the advanced burning phases up to ...
  • Partition function, metastability, and kinetics of the escape transition for an ideal chain 
    Klushin L.I.; Skvortsov A.M.; Leermakers F.A.M. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2004)
    The exact partition of the gaussian chain squeezed between two cylinders for a phase transition in a single macromolecule is analyzed. The polymer chain is squeezed between two pistons which results in abrupt transition ...
  • S-brane solutions in gauged and ungauged supergravities 
    Gutperle M.; Sabra W. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2004)
    We construct time dependent S-brane solutions in gauged and ungauged supergravities in various dimensions. The supergravity solutions we find are all special cases of solutions in gauged supergravities with symmetric ...
  • SL(2,C) gravity with a complex vierbein and its noncommutative extension 
    Chamseddine A.H. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2004)
    We show that it is possible to formulate gravity with a complex vierbein based on SL(2,C) gauge invariance. The proposed action is a four-form where the metric is not introduced but results as a function of the complex ...
  • Second-order vibronic reduction factors for orbital triplet Jahn-Teller systems in cubic and icosahedral symmetry 
    Bates C.A.; Abou-Ghantous M.; Dunn J.L.; Al-Hazmi F.; Polinger V.Z.; Moujaes E.A. (BRISTOLDIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND, 2004)
    It is well-known that vibronic interactions can be modelled in terms of an effective Hamiltonian incorporating first and second-order reduction factors (RFs), particularly when analysing the spectroscopic properties. ...
  • Regular non-Abelian vacua in N = 4, SO(4) gauged supergravity 
    Chamseddine A.H.; Volkov M.S. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2004)
    We present a family of globally regular N = 1 vacua in the D = 4, JV = 4 gauged supergravity of Gates and Zwiebach. These solutions are labeled by the ratio ξ of the two gauge couplings, and for ξ = 0 they reduce to the ...
  • Negative compressibility for a polymer chain squeezed between two pistons going through the escape transition 
    Leermakers F.A.M.; Skvortsov A.M.; Klushin L.I. (Institute of Physics Publishing; BRISTOLDIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND, 2004)
    The analysis of the exact partition function of an end-fixed Gaussian chain compressed between two pistons reveals a loop-like curve of the average pressure as a function of the inter-piston volume. In the thermodynamic ...
  • Conformal moduli and b - c pictures for NRS strings 
    Polyakov D. (SINGAPORE5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE, 2005)
    We explore the geometry of superconformal moduli of the NSR superstring theory in order to construct the consistent sigma-model for NSR strings, free of picture-changing complications. The sigma-model generating functional ...
  • Mass in anti-de Sitter spaces 
    Liu J.T.; Sabra W.A. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2005)
    The boundary stress tensor approach has proven extremely useful in defining mass and angular momentum in asymptotically anti-de Sitter spaces with CFT duals. An integral part of this method is the use of boundary counterterms ...
  • Accurate calculations of second-order vibronic reduction factors for C 60 ions 
    Al-Hazmi F.E.; Moujaes E.A.; Abou-Ghantous M.; Bates C.A.; Dunn J.L. (BRISTOLDIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND, 2005)
    An effective Hamiltonian containing Jahn-Teller (JT) first- and second-order vibronic reduction factors (RFs) is a convenient way of modelling the spectroscopic properties of solids and molecules in which vibronic interactions ...
  • Effect of systemic insulin and angiotensin II receptor subtype-1 antagonist on endothelin-1 receptor subtype(s) regulation and binding in diabetic rat heart 
    Karam C.N.; Nuwayri-Salti N.; Usta J.A.; Zwainy D.S.; Abrahamian R.E.; Al Jaroudi W.A.; Baasisri M.J.; Abdallah S.M.; Bitar K.M.; Bikhazi A.B. (PHILADELPHIA325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA, 2005)
    This study reports on the regulation and remodeling role of endothelin-1 (ET-1) and its receptor subtypes, ETA-Rs-ETB-Rs, at the coronary endothelium (CE) and cardiomyocyte (CM) sites. It is carried out in normal and ...
  • Crystal-field investigations and magnetic properties of Nd 3+-doped Bi 4Si 3O 12 
    Isber S.; Tabbal M.; Christidis T.; Charar S.; Terki F.; Ishii M. (COLLEGE PKONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 2005)
    The magnetic properties of bismuth silicate (BSO) doped with Nd 3+, Bi 4(1-x)Nd 4xSi 3O 12 (x=0.5percent, 1.5percent, 2.5percent, 3.5percent, and 5percent) were investigated. X-band electron paramagnetic resonance measurements ...
  • General supersymmetric solutions of five-dimensional supergravity 
    Gutowski J.B.; Sabra W. (NEW YORK233 SPRING ST, NEW YORK, NY 10013 USA, 2005)
    The classification of 1-4-supersymmetric solutions of five dimensional gauged supergravity coupled to arbitrary many abelian vector multiplets, which was initiated in [15], is completed. The structure of all solutions for ...
  • Black hole mass and Hamilton-Jacobi counterterms 
    Batrachenko A.; Liu J.T.; McNees R.; Sabra W.A.; Wen W.Y. (NEW YORK233 SPRING ST, NEW YORK, NY 10013 USA, 2005)
    We apply the method of holographic renormalization to computing black hole masses in asymptotically anti-de Sitter spaces. In particular, we demonstrate that the Hamilton-Jacobi approach to obtaining the boundary action ...

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