DSpace Home
→
08 Faculty of Arts and Sciences
→
Browsing 08 Faculty of Arts and Sciences by Issue Date

Browsing 08 Faculty of Arts and Sciences by Issue Date

Now showing items 41-60 of 720

A simple adsorbate model in STM

Bracher, Christian; Rıza, Mustafa; Kleber, Markus (Springer-Verlag, 1998)

We discuss a novel source-theoretical description of the STM based on the concepts of quantum-mechanical scattering theory. As an application of the formalism, we study how the presence of a crystalline adsorbate layer ...
Perturbed Coulomb potentials in the Klein-Gordon equation via the shifted- l expansion technique

Barakat, Thabit; Maen, Odeh; Mustafa, Omar (IOP PUBLISHING LTD, 1998)

A shifted-l expansion technique is introduced to calculate the energy eigenvalues for the Klein-Gordon (KG) equation with Lorentz vector and/or Lorentz scalar potentials. Although it applies to any spherically symmetric ...
Modified RN Metric in an External Electrostatic Field

Halilsoy, Mustafa; Al-Badawi, A. (Nuovo Cimento B, Springer, 1998)
Variational approach to the tunneling-time problem

Bracher, Christian; Rıza, Mustafa; Kleber, Markus (AMER PHYSICAL SOC, 1999)

Tunneling problems are characterized by different quantum time scales of motion. In this paper, we identify a tunneling time scale, which is based on a simple variational principle. The method utilizes the stationary e ...
Bound states for spiked harmonic oscillators and truncated Coulomb potentials

Mustafa, Omar; Maen, Odeh (IOP Publishing, 1999)

We propose a new analytical method to solve for the nonexactly solvable Schrodinger equation. Successfully, it is applied to a class of spiked harmonic oscillators and truncated Coulomb potentials. The utility of this ...
Anharmonic oscillators energies via artificial perturbation method

Mustafa, Omar; Odeh, Maen (Springer-Verlag, 2000)

A new pseudoperturbative (artificial in nature) methodical proposal [15] is used to solve for Schrodinger equation with a class of phenomenologically useful and methodically challenging anharmonice oscillator potentials ...
Effect of sources on the inner horizon of black holes

Gürtuğ, Özay; Halilsoy, Mustafa (The American Physcial Society, 2001)

A single pulse of null dust and colliding null dust both transform a regular horizon into a spacelike singularity in the space of colliding waves. The local isometry between such space-times and black holes extrapolates these ...
Energy levels of neutral atoms via a new perturbation method

Mustafa, Omar; Odeh, Maen (Inst Physıcs Acad Scı Czech Republıc, 2001)

The energy levels of neutral atoms supported by Yukawa potential, V(r)=-Z exp(-\alpha r)/r, are studied, using both dimensional and dimensionless quantities, via a new analytical methodical proposal (devised to solve for ...
Energy levels of neutral atoms via a new perturbation method

Mustafa, Omar; Odeh, Maen (Springer, 2001)

The energy levels of neutral atoms supported by Yukawa potential, V(r)=-Z exp(-\alpha r)/r, are studied, using both dimensional and dimensionless quantities, via a new analytical methodical proposal (devised to solve for ...
A PROCEDURE FOR THE TREATMENT OF THE VELOCITY-PRESSURE COUPLING PROBLEM IN INCOMPRESSIBLE FLUID FLOW

Mazhar, Zeka (Taylor & Francis (Routledge), 2001)

A new block implicit procedure ( BID) is introduced which utilizes a simple incomplete decomposition of the matrix resulting from the discretization of the momentum and mass conservation equations for incompressible uid ...
The Effect of Sources on the Inner Horizon of Black Holes

Gürtuğ, Özay; Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 2001)

A single pulse of null dust and colliding null dust both transform a regular horizon into a spacelike singularity in the space of colliding waves. The local isometry between such space-times and black holes extrapolates ...
Rearrangeability of (2 log n N− 1)-stage networks employing a uniform connection pattern

Bashirov, Rza (Calcolo, Springer, 2001)

In this paper, we study the rearrangeablity of multistage networks. Although the necessity of (2 lgN −1)1 stages for rearrangeability of a shuffle-exchange network has been known, the sufficiency of (2 lgN −1) stages has ...
An Enhancement To The Block Implicit Procedure For The Treatment Of The Velocity-Pressure Coupling Problem In Incompressıble Fluid Flow

Mazhar, Zeka (Taylor & Francis, 2002)

The performance of two new non-segregated, block implicit procedures; BIP and BIPEN are compared with the well known SIMPLER procedure, applied to benchmark problems of various sizes. It is demonstrated that BIP provides ...
Magnetic fingerprints on the spectra of one electron and two electrons interacting in parabolic quantum dots

Mustafa, Omar; Odeh, Maen (INST PHYSICS ACAD SCI CZECH REPUBLIC, Springer (Online Publishing), 2002)

Magnetic fingerprints on the spectra of an interacting electron with a negatively charged ion in a parabolic quantum dot (QD), and of two interacting electrons in such a dot, are investigated via a pseudoperturbative ...
On the quasi-exact solvability of a singular potential in D-dimensions: Confined and unconfined

Mustafa, Omar (Inst Physics Acad Sci Czech Republic, Springer (Online Publishing), 2002)

The D -dimensional quasi - exact solutions for the singular even - power anharmonic potential V(q)=aq^2+bq^{-4}+cq^{-6} are reported. We show that whilst Dong and Ma's [5] quasi - exact ground - state solution (in D=2) is ...
Asymptotic solvability of an imaginary cubic oscillator with spikes

Znojil, Miloslav; Gemperle, Frantisek; Mustafa, Omar (IOP Publishing, 2002)

For complex potentials V(x) = -(ix)(3) -beta(2)(ix)(-2) - 2betadelta(ix)(1/2) which are PT symmetric, we show that in beta much greater than 1 strong coupling regime the low-lying bound states almost coincide with harmonic ...
Synthesis and photophysical properties of N,N′-bis(4-cyanophenyl)-3,4,9,10-perylenebis(dicarboximide) and N,N′-bis(4-cyanophenyl)-1,4,5,8-naphthalenediimide

Uzun, Duygu; Özser, Mustafa E.; Yüney, Kıvanç; Icil, Huriye; Demuth, Martin (Elsevier B.V, 2003)

N,N′-Bis(4-cyanophenyl)-1,4,5,8-naphthalenediimide (CN-NDI) and N,N′-bis(4-cyanophenyl)-3,4,9,10-perylenebis(dicarboximide) (CN-PDI) have been synthesized under special conditions in high yield. The compounds are characterized ...
New Singular and Nonsingular Colliding Wave Solutions in Einstein-Maxwell-Scalar Theory

Gürtuğ, Özay; Halilsoy, Mustafa; Sakallı, İzzet (Kluwer Academic Publishers-Plenum Publishers, 2003)

A technique is given to generate coupled scalar field solutions in colliding Einstein-Maxwell (EM) waves. By employing the Bell-Szekeres solution as seed and depending on the chosen scalar field, it is possible to construct ...
Dirac and Klein–Gordon particles in complex Coulombic fields: a similarity transformation

Mustafa, Omar (IOP Publishing, 2003)

The observation that the existence of the amazing reality and discreteness of the spectrum need not necessarily be attributed to the Hermiticity of the Hamiltonian is re-emphasized in the context of the non-Hermitian Dirac ...
On the spectroscopic structure of two interacting electrons in a quantum dot

Mustafa, Omar (INST PHYSICS ACAD SCI CZECH REPUBLIC, Springer (Online Publishing), 2003)

The shifted 1/N expansion technique used by El-Said [Phys. Rev. B 61 (2000) 13026], to study the relative Hamiltonian of two interacting electrons confined in a quantum dot, is investigated. El-Said's results from shifted ...