Güncel Gönderiler: Makale Koleksiyonu
Toplam kayıt 1058, listelenen: 281-300
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Scattering from a PT symmetric standing wave
(Elsevier, 2012)We study the Kapitza-Dirac diffraction of a free beam particle in the presence of a PT symmetric standing wave. We discuss that the momentum and total probability are not conserved in the non-Hermitian scattering process. ... -
Fast frictionless expansion of an optical lattice
(Elsevier Science BV, 2012)We investigate fast frictionless expansion of an optical lattice with dynamically variable spacing (accordion lattice). We design an expansion trajectory that yields a final state identical to the initial state up to an ... -
Bright soliton in an expulsive potential in a dipolar condensate
(Elsevier Science BV, 2011)We study the stability of matter-wave bright solitons for a dipolar Bose-Einstein condensate in a harmonic potential which is transversely attractive and longitudinally expulsive. We map the regimes of stability as a ... -
Absorption and emission processes in noncommutative space
(World Scientific Publ Co Pte LTD, 2006)Atom-field interaction and absorption, emission of photons in noncommutative space are investigated. We calculate the rate and the directional distribution of the radiation. The modified selection rules which govern allowed ... -
Feshbach resonance and growth of a Bose-Einstein condensate
(American Physical Soc, 2006)The Gross-Pitaevskii gain equation is used to model atom laser and Bose-Einstein condensation (BEC) fed by the surrounding thermal cloud. It is shown that the number of atoms continuously injected into BEC from the reservoir ... -
Dynamical control in a quasi-periodically modulated optical lattice
(Epl Association, European Physical Society, 2013)We investigate quantum tunneling phenomena for an optical lattice subjected to a bichromatic ac force. We show that incommensurability of the frequencies leads to super Bloch oscillation. We propose directed super Bloch ... -
The isospin admixture of the ground state and the properties of the isobar analog resonances in medium and heavy mass nuclei
(Indian Acad Sciences, 2006)Within the framework of quasiparticle random phase approximation (QRPA), Pyatov-Salamov method [23] for the self-consistent determination of the isovector effective interaction strength parameter, restoring a broken isotopic ... -
Inverted oscillator
(IOP Publishing LTD, 2006)The inverted harmonic oscillator problem is investigated quantum mechanically. The exact wavefunction for the confined inverted oscillator is obtained and it is shown that the associated energy eigenvalues are discrete, ... -
Dark and bright solitons in a Bose-Einstein condensate with a Feshbach resonance
(Royal Swedish Acad Sciences, 2007)Both dark and bright solitons are constructed exactly for a Bose - Einstein condensation with a time-dependent scattering length in an expulsive parabolic potential. It is shown analytically how the size of the cloud and ... -
Electrical conductivity, optical and structural properties of indium-doped ZnO nanofiber thin film deposited by spray pyrolysis method
(Elsevier Science BV, 2006)The indium-doped ZnO nanofiber thin film has been deposited by spray pyrolysis method. Donor level and barrier height energies for the film were determined from the temperature dependence of the conductivity and were found ... -
A new dioxime ligand and its trinuclear copper(II) complex: Synthesis, characterization and optical properties
(Elsevier Science BV, 2007)The synthesis and characterization of a new dioxime ligand, (H,L), (III) and its trinuclear copper(II) complex, [Cu3L2(H2O)(2)](ClO4)(2), (V) is described. IR spectra show that the ligand acts in a tetradentate manner and ... -
Thermally stimulated current and space charge limited current mechanism in film of the gold/zinc oxide/gold type
(Elsevier Science BV, 2007)The thermally stimulated current (TSC) and space charge limited current (SCLC) properties of n-type spray pyrolyzed ZnO thin film were investigated using TSC and current-voltage measurements. TSC measurements of the n-type ... -
Acidity study on 3-substituted pyridines
(MDPI AG, 2005)A comprehensive theoretical study for the protonation of some 3-substituted pyridines has been carried out in aqueous solution (epsilon = 78.4) by semi empirical AM1 method in MOPAC2000 and PM5 method in MOPAC2002. Solvent ... -
Intramolecular Hydrogen Bonding and Tautomerism in Schiff Bases: Synthesis, Spectroscopic and Theoretical Studies of N-(2,2 '-Methylenebis(4-methoxyphenyl)salicylidene and N-(2,2 '-Methylenebis(4-methoxyphenyl)-2-oxonaphthalidene-methylamine
(Asian Journal Of Chemistry, 2014)The new Schiff bases (4 and 5) were synthesized respectively from the reaction of 2,2'-methylenebis(4-aminomethoxybenzene) (3) with salicylaldehyde and 2-hydroxy-1-naphthaldehyde. The products have been characterized by ... -
Adsorption of Acid Blue 193 from aqueous solutions onto Na-bentonite and DTMA-bentonite
(Academic Press Inc Elsevier Science, 2004)Dodecyltrimethylammonium bromide-modified bentonite (DTMA-bentonite) was prepared and tested as an adsorbent for an acid dye (Acid Blue 193, AB 193) removal from aqueous solution in comparison with Na-bentonite. The effect ... -
Ni(II) ion-imprinted solid-phase extraction and preconcentration in aqueous solutions by packed-bed columns
(Elsevier Science BV, 2004)Solid-phase extraction (SPE) columns packed with materials based on molecularly imprinted polymers (MIPs) were used to develop selective separation and preconcentration for Ni(II) ion from aqueous solutions. SPE is more ... -
Electrochemical polymerization of fluoro- and chloro-substituted anilines and copolymers with aniline
(John Wiley & Sons Inc, 2004)Poly(2-fluroaniline) and poly(2-chloroaniline) were synthesized by an electrochemical method in an acetonitrile solution containing tetrabutylammonium perchlorate and perchloric acid. Also, the electrochemical copolymerization ... -
The synthesis, characterization and structural analysis of a Co(III) complex of 1,10-phenanthroline and perfluorosebacic acid, [Co(HL)(phen)(2)(H2O)]L center dot H2O
(Verlag Z Naturforsch, 2006)The hexacoordinated mononuclear Co(III) complex 1, [Co(HL)(phen)(2)(H2O)]L center dot H2O, with the mixed ligands (H2L = HO2C(CF2)(8)CO2H and 1,10-phenantroline) has been synthesized and characterized by elemental analysis, ... -
Electrochemical preparation of poly(2-bromoaniline) and poly(aniline-co-2-bromoaniline) in acetonitrile
(John Wiley & Sons Inc, 2003)Electrochemical preparation of poly(2-bromoaniline) (PBrANI) and poly(aniline-co-2-bromoaniline) [P(An-co-2-BrAn)] was carried out in an acetonitrile solution containing tetrabutylammonium perchlorate (TBAP) and perchloric ... -
Electrochemical synthesis of sulfonated polypyrrole in FSO3H/acetonitrile solution
(John Wiley & Sons Inc, 2004)The incorporation of SO3- groups into a polypyrrole backbone was successfully carried out using FSO3H/acetonitrile medium. The degree of sulfonation (sulfonation or sulfur-to-nitrogen ratio) of polymer was controlled by ...
