OICC PRESS On validity of paraxial theory for super-Gaussian laser beams propagating in a plasma Volume 11 (2017) Issue 3, August 2017 2022 12 26 On validity of paraxial theory for super-Gaussian laser beams propagating in a plasma 10.1007/s40094-017-0262-z EN Journal Article 2022 12 26 AbstractIn the present paper, we have investigated a situation where a high intensity laser beam passes through a gas and ionizes this gas by tunnel ionization. Here the electric field of the laser provides a sufficient velocity to the electrons to surpass the Coulomb barrier of the atom. Owing to the ionization the plasma density enhances which affects the laser beam propagation. The use of paraxial ray approximation theory for the present case of super-Gaussian lasers reveals the self-focusing of the beams and frequency upshifting. The predicted self-focusing of the laser beams is contrary to the expected outcome of defocusing of these beams in the plasma, indicating that the paraxial theory may not be valid for the case of super-Gaussian lasers even for the inclusion of most of the near axis region in the theory.

OICC PRESS Water treatment by the AC gliding arc air plasma Volume 11 (2017) Issue 3, August 2017 2022 12 26 Water treatment by the AC gliding arc air plasma 10.1007/s40094-017-0254-z EN Journal Article 2022 12 26 AbstractIn this study, the effects of gliding arc (G Arc) plasma system on the treatment of water have been investigated experimentally. An AC power supply of 15 kV potential difference at 50 Hz frequency was employed to generate plasma. Plasma density and temperature were measured using spectroscopic method. The water was contaminated with staphylococcus aureus (Gram-positive) and salmonella bacteria (Gram-negative), and Penicillium (mold fungus) individually. pH, hydrogen peroxide, and nitride contents of treated water were measured after plasma treatment. Decontamination of treated water was determined using colony counting method. Results indicate that G Arc plasma is a powerful and green tool to decontaminate water without producing any byproducts.

OICC PRESS Low-frequency shock waves in a magnetized superthermal dusty plasma Volume 11 (2017) Issue 3, August 2017 2022 12 26 Low-frequency shock waves in a magnetized superthermal dusty plasma 10.1007/s40094-017-0260-1 EN Journal Article 2022 12 26 AbstractThe characteristics of low-frequency shocks in a magnetized dusty plasma comprising of negatively charged dust fluid, kappa-distributed electrons and ions have been investigated. Using the reductive perturbation method, the nonlinear Korteweg de–Vries–Burgers (KdV–B) equation which governs the dynamics of the dust acoustic (DA) shock waves is derived. The characteristics of shock structures are studied under the influence of various plasma parameters, viz. superthermality of ions, magnetic field, electron-to-dust-density ratio, kinematic viscosity, ion-to-electron-temperature ratio and obliqueness. The combined effects of these physical parameters significantly influence the characteristics of DA shock structures. It is observed that only negative potential shocks exist in a plasma environment comprising of dust fluid and superthermal electrons and ions such as that of Saturn’s magnetosphere.

OICC PRESS Formulation of atomic positions and carbon–carbon bond length in armchair graphene nanoribbons: an ab initio study Volume 11 (2017) Issue 3, August 2017 2022 12 26 Formulation of atomic positions and carbon–carbon bond length in armchair graphene nanoribbons: an ab initio study 10.1007/s40094-017-0261-0 EN Journal Article 2022 12 26 AbstractIn this paper, we investigate the atomic positions of single layer armchair graphene nanoribbon for two cases, with and without hydrogen-passivate edges, accurately and propose a formula which either removes the need of structural relaxation generally or decreases its time extremely (up to seven times). We also propose a general pattern (hyperbolic) for these positions. On the other hand, we show that edge effect influences several atoms near the edge not just one. These results can be used in software, which compute atomic positions and can increase their efficiency. In addition, we prove that the C–C bond distance depends on dimer number and differs in length and width directions, especially for narrow AGNRs. The maximum value of these differences is about 0.017 Å.

OICC PRESS Effect of gamma ray on optical characteristics of (PMMA/PS) polymer blends Volume 11 (2017) Issue 3, August 2017 2022 12 26 Effect of gamma ray on optical characteristics of (PMMA/PS) polymer blends 10.1007/s40094-017-0259-7 EN Journal Article 2022 12 26 AbstractGamma ray effect has been worked out on PMMA/PS blends at different concentrations. The optical constants such as the absorption coefficient, refractive index are calculated, and optical energy gap (direct/indirect) has been studied before and after irradiation. Transmittance, absorbance, and reflectance spectra of pure and blends polymers are investigated.

OICC PRESS Thermodynamics of charged rotating solutions in Brans–Dicke gravity with Born–Infeld field Volume 11 (2017) Issue 3, August 2017 2022 12 26 Thermodynamics of charged rotating solutions in Brans–Dicke gravity with Born–Infeld field 10.1007/s40094-017-0258-8 EN Journal Article 2022 12 26 AbstractWe derive new exact charged rotating solutions of (n+1)documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$(n+1)$$end{document}-dimensional Brans–Dicke theory in the presence of Born–Infeld field and investigated their properties. Because of the coupling between scalar field and curvature, the field equations cannot to be solved directly. Using a new conformal transformation, which transforms the Einstein-dilaton–Born–Infeld gravity Lagrangian to the Brans–Dicke–Born–Infeld gravity one, the field equations are solved. We also compute temperature, charge, mass, electric potential, and entropy; entropy, however, does not obey the area law. These quantities are invariant under conformal transformation and satisfy the first law of thermodynamics.

OICC PRESS Amplitude modulation of three-dimensional low-frequency solitary waves in a magnetized dusty superthermal plasma Volume 11 (2017) Issue 3, August 2017 2022 12 26 Amplitude modulation of three-dimensional low-frequency solitary waves in a magnetized dusty superthermal plasma 10.1007/s40094-017-0255-y EN Journal Article 2022 12 26 AbstractThe amplitude modulation of three-dimensional (3D) dust ion-acoustic wave (DIAW) packets is studied in a collisionless magnetized plasma with inertial positive ions, superthermal electrons and negatively charged immobile dust grains. By using the reductive perturbation technique, a 3D-nonlinear Schrödinger equation is derived, which governs the slow modulation of DIAW packets. The latter are found to be stable in the low-frequency (ωomega _{ ext {c}}$$end{document}, and the modulational instability is related to the modulational obliqueness (θ)documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$( heta )$$end{document}. Here, ω(ωc)documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$omega ~(omega _{ ext {c}})$$end{document} is the nondimensional wave (ion-cyclotron) frequency. It is shown that the superthermal parameter κdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$kappa$$end{document}, the frequency ωcdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$omega _{ ext {c}}$$end{document} as well as the charged dust impurity (0

OICC PRESS The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system Volume 11 (2017) Issue 3, August 2017 2022 12 26 The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system 10.1007/s40094-017-0256-x EN Journal Article 2022 12 26 AbstractIn the present paper, our aims are the investigation of the effects of the spray parameters of the aluminum-coated layer on the microstructure and mechanical properties. For this purpose, we use the self-generated atmospheric plasma spray system for coating of aluminum on the carbon steel substrate to protect it against corrosion degradation. This system allows us to achieve the best choice for parameters. In this paper, the effects of spray distance and argon flow rate on the characteristics of aluminum coating are investigated. To obtain the results, the analyses are used such as X-ray diffraction, scanning electron microscope, micro hardness of the coating by Vickers method, and adhesion strength behaviors by pull-off test. The results show that the porosity increases with increasing distance. This phenomenon reduces the hardness and adhesion, which is clearly evident in our results. The other important conclusion is that, if the gas flow rate increases, the porosity decreases. It is shown that the best adhesion strength is obtained at the special value of the spraying distance.

OICC PRESS Negative and positive dust grain effect on the modulation instability of an intense laser propagating in a hot magnetoplasma Volume 11 (2017) Issue 3, August 2017 2022 12 26 Negative and positive dust grain effect on the modulation instability of an intense laser propagating in a hot magnetoplasma 10.1007/s40094-017-0263-y EN Journal Article 2022 12 26 AbstractThe modulation instability of intense circularly polarized laser beam in hot magnetized dusty plasma is studied. A nonlinear equation describing the interaction of laser with dusty plasma in the quasi-neutral approximation is derived. The effect of negative and positive dust grains on the laser modulation growth rate is studied. It is shown that the existence of positive dust grains instead of ions can substantially improve the modulation growth rate.

OICC PRESS Effects of various applied voltages on physical properties of TiO2 nanotubes by anodization method Volume 11 (2017) Issue 3, August 2017 2022 12 26 Effects of various applied voltages on physical properties of TiO2 nanotubes by anodization method 10.1007/s40094-017-0257-9 EN Journal Article 2022 12 26 AbstractThree steps anodization process is used to synthesize highly ordered and uniform multilayered titanium oxide (TiO2) nanotubes and effect of different anodization voltages are studied on their physical properties such as structural, morphological and optical. The crystalized structure of the synthesized tubes is investigated by X-ray diffractometer analysis. To study the morphology of the tubes, field emission scanning electron microscopy is used, which showed that the wall thicknesses and the diameters of the tubes are affected by the different anodization voltages. Moreover, optical studies performed by diffuse reflection spectra suggested that band gap of the TiO2 nanotubes are also changed by applying different anodization voltages. In this study using physical investigations, an optimum anodization voltage is obtained to synthesize the uniform crystalized TiO2 nanotubes with suitable diameter, wall thickness and optical properties.