Central European Journal of Physics

article

Erratum: Critical fields of a superconducting cylinder

G. F. Zharkov

Central European Journal of Physics > 2004 > 2 > 2 > 419-419

The online version of the original article can be found at http://dx.doi.org/10.2478/BF02476282

article

IBM-2 calculations of some even-even selenium nuclei

Nurettin Türkan, Davut Olgun, Ýhsan Uluer

Central European Journal of Physics > 2006 > 4 > 1 > 124-154

In this study, we determined the most appropriate Hamiltonian that is needed for present calculations of nuclei in the A≅ 80 region by the view of interacting boson model (IBM-2). Using the best-fitted values of parameters in the Hamiltonian, we have calculated energy levels and B(E2) values for a number of transitions in some doubly even Se nuclei. The results were compared with the previous experimental...

article

Stock mechanics: Predicting recession in S&P500, DJIA and NASDAQ

Çağlar Tuncay

Central European Journal of Physics > 2006 > 4 > 1 > 58-72

Proposed in this paper is an original method assuming potential and kinetic energies for prices and for the conservation of their sum that has been developed for forecasting exchanges. Connections with a power law are shown. Semiempirical applications on the S&P500, DJIA, and NASDAQ predict a forthcoming recession in them. An emerging market, the Istanbul Stock Exchange index ISE-100 is found...

article

Ac electrical parameters of Al-ZnPc-Al organic semiconducting films

Rushdi M. -L. Kitaneh, Abdelkarim M. Saleh, Robert D. Gould

Central European Journal of Physics > 2006 > 4 > 1 > 87-104

The ac electrical parameters of thermally evaporated zinc phthalocyanine, ZnPc, semiconducting thin films was measured in the temperature range of 180–390 K and frequency between 0.1 and 20 kHz. Aluminum electrode contacts were utilized to sandwich the organic ZnPc semiconducting films. Capacitance and loss tangent decreased rapidly with frequency at high temperatures, but at lower temperatures a...

article

Influence of interdiffusion on the electrical conductivity of multilayered metal films

Leonid V. Dekhtyaruk

Central European Journal of Physics > 2006 > 4 > 1 > 73-86

The annealing-time dependence of the electrical conductivity of multilayered single-crystal and polycrystalline metal films has been analyzed theoretically within the frame of the semi-classical approach. It is demonstrated that changes in the electrical conductivity which are caused by the diffusion annealing allow for investigating the processes of the bulk and grain-boundary diffusion, and for...

article

Coulomb blockade in molecular quantum dots

Kamil Walczak

Central European Journal of Physics > 2006 > 4 > 1 > 8-19

The rate-equation approach is used to describe sequential tunneling through a molecular junction in the Coulomb blockade regime. Such device is composed of molecular quantum dot (with discrete energy levels) coupled with two metallic electrodes via potential barriers. Based on this model, we calculate nonlinear transport characteristics (conductance-voltage and current-voltage dependences) and compare...

article

Divergence of geometrical optics series at the boundary of its applicability: An analytical example in elementary functions (2D Gaussian beam in free space)

Yury A. Kravtsov, Stefan Buske

Central European Journal of Physics > 2006 > 4 > 1 > 1-7

An analytical example in elementary functions is presented (2D Gaussian beam diffraction in free space), which demonstrates the divergence of the geometrical optics (GO) series when the conditions for its applicability are violated. This example shows that accounting for higher terms in GO power series leads to divergence and therefore becomes completely useless beyond the boundaries of GO applicability.

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Large scale multi-configuration Hartree-Fock calculation of the hyperfine structure of the ground state of vanadium

Oliver Scharf, Gediminas Gaigalas

Central European Journal of Physics > 2006 > 4 > 1 > 42-57

The hyperfine structure of the ground state of vanadium, ⁵¹VI, is calculated in the nonrelativistic framework of the multi-configuration Hartree-Fock approximation. A configuration state function limiting algorithm is used to make the calculations feasible and to study the influence of core, valence and core-valence correlations in detail. The obtained configuration state function space captures the...

article

Structural study of TiO₂ thin films by micro-Raman spectroscopy

Ahti Niilisk, Mart Moppel, Martti Pärs, Ilmo Sildos, more

Central European Journal of Physics > 2006 > 4 > 1 > 105-116

The Raman spectroscopy method was used for structural characterization of TiO₂ thin films prepared by atomic layer deposition (ALD) and pulsed laser deposition (PLD) on fused silica and single-crystal silicon and sapphire substrates. Using ALD, anatase thin films were grown on silica and silicon substrates at temperatures 125–425 °C. At higher deposition temperatures, mixed anatase and rutile phases...

article

Spin-dependent transport through magnetic nanojunctions

Kamil Walczak, Gloria Platero

Central European Journal of Physics > 2006 > 4 > 1 > 30-41

Coherent electronic transport through a molecular device is studied using non-equilibrium Green's function (NEGF) formalism. Such device is made of atomic nanowire which is connected to ferromagnetic electrodes. The molecule itself is described with the help of Hubbard model (Coulomb interactions are treated by means of the Hartree-Fock approximation), while the coupling to the electrodes is modeled...

article

Performance of lead iodide nuclear radiation detectors with the introduction of rare earth elements

Mahmoud Hassan, Marie Matuchova, Karel Zdansky

Central European Journal of Physics > 2006 > 4 > 1 > 117-123

Lead iodide has been recognized as a promising material for room temperature radiation detectors. It has a wide band-gap (∼ 2.3 eV), high atomic numbers (82, 53) and it is environmentally very stable compared to mercuric iodide. Electrical and optical properties of lead iodide grown crystals purified under the influence of selected rare earth elements have been investigated. Photo-luminescence and...

article

Influence of iodine on the electrical properties of magnesium phthalocyanines thin film devices

Abraham C. Varghese, C. S. Menon

Central European Journal of Physics > 2006 > 4 > 1 > 20-29

The influence of iodine on the electrical properties of sandwich structures of magnesium phthalocyanine (Mg Pc) thin films with gold and aluminium electrodes has been investigated. The various electrical properties and different electrical parameters of the iodine-doped Mg Pc thin film devices have been estimated and compared with the values of normal Mg Pc devices from the analysis of the current-voltage...

article

A new approach to the use of EMMRS: Ionic Mobility MR Spectroscopy (IMMRS)

Czesław Józef Lewa, Tomasz Klinkosz

Central European Journal of Physics > 2006 > 4 > 2 > 168-177

A new approach to the use of the previously proposed method called Electrical Mobility Magnetic Resonance Spectroscopy (EMMRS) has been worked out. It consists in obtaining mobility distribution, lifetimes, and activation energy of charge carriers by introducing into the medium a longitudinal elastic wave perpendicular to the electric field which causes displacement of charges (electrons, protons,...

article

Dynamics of two quantum entangled particles interacting with a potential barrier in an EPR experiment

Vittoria Petrillo, Giorgia Alberti, Luca Celardo, Francesco Cerutti, more

Central European Journal of Physics > 2006 > 4 > 2 > 196-209

The effect of a position measurement on one component of a two-particle wave packet in a regularized space-momentum entangled state is analyzed. The wave packet interacts in the physical space with a potential barrier. When a position or momentum measurement is performed on one particle, a consequent strong modification of the dynamics of the other particle occurs.

article

Transient properties of a bistable kinetic model with quantum corrections

Bao-quan Ai, Hua Zheng, Hui-zhang Xie, Liang-gang Liu

Central European Journal of Physics > 2006 > 4 > 2 > 270-276

The transient properties of a Brownian particle moving in a bistable system with quantum corrections are investigated. The Quantum Smoluchowski Equation (QSE) is fully valid for high temperatures; for low temperatures it is valid only in a restricted domain of the state space. The quantum effects in a bistable system stand out for low temperatures. Explicit expressions of the mean first-passage time...

article

Changes of thermal, mechanical and magnetic properties of an amorphous Fe₈₀Cr₅B₁₅ alloy during magnetic and structural phase transitions

Paweł Kamasa, Piotr Myśliński

Central European Journal of Physics > 2006 > 4 > 2 > 178-186

Thermal, mechanical and thermomagnetic properties associated with the magnetic and structural transition of an amorphous Fe₈₀Cr₅B₁₅ alloy are described. The investigation was carried out in a simultaneous dilatometric and thermomagnetic experiment. An anomaly of the thermal expansion coefficient at the Curie point and a change in mechanical properties just before the onset of crystallization are observed...

article

The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

Vladislav S. Olkhovsky, Marina E. Dolinska, Sergey A. Omelchenko

Central European Journal of Physics > 2006 > 4 > 2 > 223-240

This study shows that the exponential decrease of the energy spectra, accompanied by slight oscillations, with final-fragment energy in high-energy nuclear reaction, and independent of fragments, targets, projectiles, and projectile energies, can be explained under some conditions in the range of strongly overlapping compound resonances by a new phenomenon of time resonances (explosions). These time...

article

Optical properties of Quantum Disks: Real density matrix approach

Gerard Czajkowski, Leonardo Silvestri

Central European Journal of Physics > 2006 > 4 > 2 > 254-269

We show how to compute the optical response of a Quantum Disk (QDisk) to an electromagnetic wave as a function of the incident wave polarization, in the energetic region of interband transitions. Both the TM and TE polarization in guided-wave geometry are analyzed. The method uses the microscopic calculation of Quantum Disk eigenfunctions and the macroscopic real density matrix approach to compute...

article

Influence of ion bombardment on the photoluminescence response of embedded CdS nanoparticles

Dambarudhar Mohanta, Fouran Singh, D. K. Avasthi, Amarjyoti Choudhury

Central European Journal of Physics > 2006 > 4 > 2 > 187-195

Semiconductor nanoparticles (CdS) were fabricated by an inexpensive chemical route using polyvinyl alcohol (PVA) as the dielectric host matrix. Nano-CdS in PVA were subjected to ion irradiation (using oxygen, chlorine and gold) in the medium energy range (80–100 MeV) and under fluence variation of 10¹¹–10¹³ ions/cm². The nature of light emission was found to be drastically different in each of the...

article

Multivariate statistical approaches as applied to environmental physics studies

Vasil Lovchinov, Stefan Tsakovski

Central European Journal of Physics > 2006 > 4 > 2 > 277-298

The present communication deals with the application of the most important environmetric approaches like cluster analysis, principal components analysis and principal components regression (apportioning models) to environmental systems which are of substantial interest for environmental physics — surface waters, aerosols, and coastal sediments. Using various case studies we identify the latent factors...

INFONA - science communication portal

Central European Journal of Physics

Erratum: Critical fields of a superconducting cylinder

IBM-2 calculations of some even-even selenium nuclei

Stock mechanics: Predicting recession in S&P500, DJIA and NASDAQ

Ac electrical parameters of Al-ZnPc-Al organic semiconducting films

Influence of interdiffusion on the electrical conductivity of multilayered metal films

Coulomb blockade in molecular quantum dots

Divergence of geometrical optics series at the boundary of its applicability: An analytical example in elementary functions (2D Gaussian beam in free space)

Large scale multi-configuration Hartree-Fock calculation of the hyperfine structure of the ground state of vanadium

Structural study of TiO₂ thin films by micro-Raman spectroscopy

Spin-dependent transport through magnetic nanojunctions

Performance of lead iodide nuclear radiation detectors with the introduction of rare earth elements

Influence of iodine on the electrical properties of magnesium phthalocyanines thin film devices

A new approach to the use of EMMRS: Ionic Mobility MR Spectroscopy (IMMRS)

Dynamics of two quantum entangled particles interacting with a potential barrier in an EPR experiment

Transient properties of a bistable kinetic model with quantum corrections

Changes of thermal, mechanical and magnetic properties of an amorphous Fe₈₀Cr₅B₁₅ alloy during magnetic and structural phase transitions

The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

Optical properties of Quantum Disks: Real density matrix approach

Influence of ion bombardment on the photoluminescence response of embedded CdS nanoparticles

Multivariate statistical approaches as applied to environmental physics studies

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