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Journal of Theoretical and Applied Physics (JTAP)

Editor-in-Chief: Davoud Dorranian

Online ISSN: 2251-7235

Print ISSN: 2251-7227

Publishes Bimonthly

Volume 14 (2020)

Issue 3, July 2020

The effect of mixed electric field on characteristic of ozone generation in a DBD plasma source

AbstractIn this paper, we have presented a new power supply structure for ozone generation in a dielectric barrier discharge reactor, so that a high-frequency pulse electric field is applied on the reactor simultaneously with a low-frequency sinusoidal electric field, referred as mixed electric field. In this study, the effect of mixed electric field variation on […]

About dark matter as an emerging entity from elementary energy density fluctuations of a three-dimensional quantum vacuum

AbstractA new suggestive explanation of dark matter as an emerging phenomenon determined by the polarization of a three-dimensional quantum vacuum, i.e., by opportune quantum vacuum energy density fluctuations, associated with processes of manifestation/demanifestation of virtual pairs of particles-antiparticles, in a background characterized by a fluctuating viscosity, is proposed. It is shown that the observed flattening […]

Anti-corrosion properties of stainless steel 304L coated with Mn-based thin film and annealed with nitrogen flux exposed to saline solution under various temperatures

AbstractIn this work the corrosion resistance of stainless steel 304L coated with Mn-based thin film and post annealed with flow of nitrogen at 723 K in 0.6 M NaCl solution is reported. The latter was performed at three different solution temperatures of 293 K, 313 K and 333 K. X-ray diffraction analysis was used to determine the crystallographical structure and […]

Silver nanoparticles dispersed in nematic liquid crystal: an impact on dielectric and electro-optical parameters

AbstractIn the present study, nematic liquid crystal (NLC) 4′-(Octyloxy)-4-biphenylcarbonitrile dispersed with three different concentrations of silver nanoparticles (Ag NPs) is characterized by electro-optical and dielectric spectroscopy method. The dispersion of Ag NPs into NLC material leads to the change in physical parameters such as dielectric permittivity, photoluminescence, threshold voltage, response time and splay elastic constant. […]

Mathematical modeling of tumor growth as a random process

AbstractA model is presented to study the random growth of the number of tumor cells. It contains deterministic growth and therapy terms, as well as a random term. The model is formulated as a Langevin equation and its corresponding Fokker–Planck equation is studied. Three forms for the time-dependence of the therapy are used and the […]

Effect of thickness on characteristics of ZnSe thin film synthesized by vacuum thermal evaporation

AbstractZinc selenide (ZnSe) thin films with various thicknesses were grown on ultrasonically clean glass substrates using vacuum evaporation of 99.99% pure ZnSe powder. Thickness dependence of the structural, optical and electrical properties was thoroughly investigated. X-ray diffraction (XRD) analyses revealed that (110) ZnSe plane is the dominant crystal plane for all the fabricated films. Both […]

Inverse bremsstrahlung absorption in laser-fusion plasma

AbstractInverse bremsstrahlung absorption (IBA) is the most efficient absorption mechanism in laser-fusion plasma. IBA is the process in which an electron absorbs a photon while colliding with an ion or with another electron. IBA of laser energy in homogeneous and unmagnetized plasma has been studied using the Fokker–Planck equation. The isotropic function is considered as […]

A systematic study on chemically deposited cadmium sulfide (CdS) thin film

AbstractIn this work, the conventional chemical bath deposition (CBD) technique and its growth parameters were systematically studied to deposit CdS thin films on the glass substrate. The samples were prepared using a simple aqueous solution containing cadmium sulfate (CdSO4·8H2O), thiourea [SC(NH2)2], ammonium sulfate [(NH4)2SO4] as a source of cadmium, sulfur, and a complexing agent, respectively. […]

Investigating the effect of geometrical asymmetry on conductance and TMR ratio in the ZnO rock salt-based MTJ: a DFT study

AbstractEffects of geometrical asymmetry on spintronic properties of Fe/ZnO/Fe magnetic tunnel junction based on zinc oxide barrier tunnel with rock-salt crystalline structure is studied. Simulations are performed using density functional theory, and substituted layers of C, Mg, Al, Mo, and Ta are used to make geometrically asymmetric structures. The results indicate that this asymmetry has […]

Microstrain and lattice disorder in nanocrystalline titanium dioxide prepared by chemical route and its relation with phase transformation

AbstractThe microstructure of nanocrystalline titanium dioxide (TiO2), synthesized by chemical route, is studied from X-ray peak profile analysis and transmission electron microscopy. The broadening of the X-ray diffraction peaks indicates the presence of small crystallites with a significant amount of disorder. The progression of broadening at lower annealing temperatures, suggests the decrease in the strain […]

Temperature dependence of EXAFS spectra of BCC crystals analyzed based on classical anharmonic correlated Einstein model

AbstractIn this work, the temperature dependence of extended X-ray absorption fine structure (EXAFS) of the body-centered cubic crystals was investigated based on the anharmonic correlated Einstein model using the classical statistical theory. The oscillation of the anharmonic EXAFS spectra presented in terms of the cumulant expansion up to the fourth order. Here, the thermodynamic parameters […]