Journal of Theoretical and Applied Physics (JTAP)Medical equipment bio-capability processes using the atmospheric plasma-sprayed titanium coatingVolume 12 (2018)Issue 1, March and April 201820231117Medical equipment bio-capability processes using the atmospheric plasma-sprayed titanium coating10.1007/s40094-017-0269-5ENF.RezaeiPlasma Physics Research Center, Science and research branch, Islamic Azad University, Tehran, IranShahroozSavizPlasma Physics Research Center, Science and research branch, Islamic Azad University, Tehran, Iran0000-0001-5874-3761Journal Article20231117AbstractAntibacterial surfaces such as titanium coatings are able to have capability in the human body environment. In this study, titanium coatings are deposited on the 316 stainless steel substrates by a handmade plasma spray system. Some mechanical, chemical properties and microstructure of the created titanium layer are determined to evaluate the quality of coating. The XRD, SEM, adhesion tests from cross cut and corrosion test by potentiodynamic are used. During the different stages, some of the parameters are changed in different samples to achieve the best quality in the coating. It is shown that by increasing the spray time, the production of nanoparticles begins. On the other hand, the best layers are created when the spray main gas flow rate has a certain amount.Journal of Theoretical and Applied Physics (JTAP)Theoretical and experimental investigation of the magnetic properties of polyvinylidene fluoride and magnetite nanoparticles-based nanocompositesVolume 12 (2018)Issue 1, March and April 201820231117Theoretical and experimental investigation of the magnetic properties of polyvinylidene fluoride and magnetite nanoparticles-based nanocomposites10.1007/s40094-018-0282-3ENM.A. RamazanovBaku State University, Z. Khalilov Str. 23, AZ 1148, Baku, AzerbaijanA.M. MaharramovBaku State University, Z. Khalilov Str. 23, AZ 1148, Baku, AzerbaijanR.A. Ali-zadaInstitute of Physics, National Academy of Sciences of Azerbaijan, Pr. H. Javid 131, Baku, AzerbaijanH.A. ShirinovaBaku State University, Z. Khalilov Str. 23, AZ 1148, Baku, AzerbaijanF.V. HajiyevaBaku State University, Z. Khalilov Str. 23, AZ 1148, Baku, AzerbaijanJournal Article20231117AbstractIn the present study, the effect of size distribution of magnetite nanoparticles in a PVDF matrix on the magnetic properties of PVDF + Fe3O4 nanocomposites was experimentally and theoretically investigated. The size distribution of nanoparticles in polymer matrix and morphology of the nanocomposites were studied by the means of scanning electron microscopy and atomic force microscopy. It was found that when the Fe3O4 nanoparticles are introduced into the polymer matrix, their coagulation takes place. The increase in the size of the particles depends on their concentration in the polymer matrix, the type of polymer (polar, non-polar, its viscosity, etc.), reaction temperatures, etc. In addition, when Fe3O4 nanoparticles are introduced into the polymer network, the oxidation of the surface layer of particles occurs and the magnetic size decreases. Consequently, the reduced magnetic properties may also be observed. The hysteresis loops have been recorded in small magnetic field range. It was found that the magnetic hysteresis parameters depend on the size and concentration of Fe3O4 nanoparticles. Theoretical calculations were compared with experimental results obtained from M(H) measurements. The reasons of differences between theoretical and experimental results have been explained.Journal of Theoretical and Applied Physics (JTAP)Effect of silver thickness on structural, optical and morphological properties of nanocrystalline Ag/NiO thin filmsVolume 12 (2018)Issue 1, March and April 201820231117Effect of silver thickness on structural, optical and morphological properties of nanocrystalline Ag/NiO thin films10.1007/s40094-018-0275-2ENS.JaliliDepartment of Physics, Karaj Branch, Islamic Azad University, Karaj, IranF.HajakbariDepartment of Physics, Karaj Branch, Islamic Azad University, Karaj, IranA.HojabriDepartment of Physics, Karaj Branch, Islamic Azad University, Karaj, IranJournal Article20231117AbstractSilver (Ag) nanolayers were deposited on nickel oxide (NiO) thin films by DC magnetron sputtering. The thickness of Ag layers was in range of 20–80 nm by variation of deposition time between 10 and 40 s. X-ray diffraction results showed that the crystalline properties of the Ag/NiO films improved by increasing the Ag film thickness. Also, atomic force microscopy and field emission scanning electron microscopy images demonstrated that the surface morphology of the films was highly affected by film thickness. The film thickness and the size of particles change by elevating the Ag deposition times. The composition of films was determined by Rutherford back scattering spectroscopy. The transmission of light was gradually reduced by augmentation of Ag films thickness. Furthermore; the optical band gap of the films was also calculated from the transmittance spectra.Journal of Theoretical and Applied Physics (JTAP)Theoretical relation between halo current-plasma energy displacement/deformation in EASTVolume 12 (2018)Issue 1, March and April 201820231117Theoretical relation between halo current-plasma energy displacement/deformation in EAST10.1007/s40094-018-0276-1ENShahabUd-Din KhanNational Tokamak Fusion Program, Pakistan Atomic Energy Commission (PAEC), Islamabad, 3329, PakistanSalahUd-Din KhanSustainable Energy Technologies Center, King Saud University, P.O.Box 800, Riyadh, 11421, Kingdom of Saudi ArabiaYuntaoSongInstitute of Plasma Physics, Chinese Academy of Sciences, P.O.Box 1126, Hefei, 230031, Anhui, People’s Republic of ChinaChenDalongInstitute of Plasma Physics, Chinese Academy of Sciences, P.O.Box 1126, Hefei, 230031, Anhui, People’s Republic of ChinaJournal Article20231117AbstractIn this paper, theoretical model for calculating halo current has been developed. This work attained novelty as no theoretical calculations for halo current has been reported so far. This is the first time to use theoretical approach. The research started by calculating points for plasma energy in terms of poloidal and toroidal magnetic field orientations. While calculating these points, it was extended to calculate halo current and to developed theoretical model. Two cases were considered for analyzing the plasma energy when flows down/upward to the diverter. Poloidal as well as toroidal movement of plasma energy was investigated and mathematical formulations were designed as well. Two conducting points with respect to (R, Z) were calculated for halo current calculations and derivations. However, at first, halo current was established on the outer plate in clockwise direction. The maximum generation of halo current was estimated to be about 0.4 times of the plasma current. A Matlab program has been developed to calculate halo current and plasma energy calculation points. The main objective of the research was to establish theoretical relation with experimental results so as to precautionary evaluate the plasma behavior in any Tokamak.Journal of Theoretical and Applied Physics (JTAP)Increased germination and growth rates of pea and Zucchini seed by FSG plasmaVolume 12 (2018)Issue 1, March and April 201820231117Increased germination and growth rates of pea and Zucchini seed by FSG plasma10.1007/s40094-018-0280-5ENShohrehKhatamiPlasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, IranArashAhmadiniaYoung Researchers and Elite Club, Science and Research Branch, Islamic Azad University, Tehran, IranJournal Article20231117AbstractRecently, cold atmospheric plasma (CAP) with the unique bio-disinfection features is used in various fields of industry, medicine, and agriculture. The main objectives of this work were to design FSG plasma (a semi-automatic device) and investigate the effect of the cold plasma in the enhancement of the Pea and Zucchini seed germination. Plasma irradiation time was studied to obtain a proper condition for the germination enhancement of seeds. The growth rate was calculated by measuring length of root and stem and dry weight of plants treated by plasma. To investigate drought resistance of plants, all treated and untreated samples were kept in darkness without water for 48 h. From the experimental results, it could be confirmed both drought resistance and germination of seedlings increased after plasma was applied to seeds at 30 s, while seeds treated whiten 60 s showed a decrease in both germination rate and seedling growth.Journal of Theoretical and Applied Physics (JTAP)Effect of dust on tilted electrostatic resistive instability in a Hall thrusterVolume 12 (2018)Issue 1, March and April 201820231117Effect of dust on tilted electrostatic resistive instability in a Hall thruster10.1007/s40094-018-0278-zENJasvendraTyagiSukhmanderSinghPlasma waves and electric propulsion laboratory, Department of Physics Central University of Rajasthan, Ajmer, Rajasthan-305817, India0000-0002-6761-1303HitendraK. MalikPlasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India0000-0002-9432-8140Journal Article20231117AbstractEffect of negatively charged dust on resistive instability corresponding to the electrostatic wave is investigated in a Hall thruster plasma when this purely azimuthal wave is tilted and strong axial component of wave vector is developed. Analytical calculations are done to obtain the relevant dispersion equation, which is solved numerically to investigate the growth rate of the instability. The magnitude of the growth rate in the plasma having dust particles is found to be much smaller than the case of pure plasma. However, the instability grows faster for the increasing dust density and the higher charge on the dust particles. The higher magnetic field is also found to support the instability.Journal of Theoretical and Applied Physics (JTAP)Studying the non-thermal plasma jet characteristics and application on bacterial decontaminationVolume 12 (2018)Issue 1, March and April 201820231117Studying the non-thermal plasma jet characteristics and application on bacterial decontamination10.1007/s40094-018-0279-yENAliF. Al-rawafDepartment of Physics, College of Science, University of Kerbala, Karbala, IraqFadhilKhaddam FulifulDepartment of Physics, College of Science, University of Kerbala, Karbala, IraqMohammedK. KhalafCenter of Applied Physics, Ministry of Science and Technology, Baghdad, IraqHusham.K. OudahCenter of Environment and Water, Ministry of Science and Technology, Baghdad, IraqJournal Article20231117AbstractNon-thermal atmospheric-pressure plasma jet represents an excellent approach for the decontamination of bacteria. In this paper, we want to improve and characterize a non-thermal plasma jet to employ it in processes of sterilization. The electrical characteristics was studied to describe the discharge of the plasma jet and the development of plasma plume has been characterized as a function of helium flow rate. Optical emission spectroscopy was employed to detect the active species inside the plasma plume. The inactivation efficiency of non-thermal plasma jet was evaluated against Staphylococcus aureus bacteria by measuring the diameter of inhibition zone and the number of surviving cells. The results presented that the plasma plume temperature was lower than 34 ∘documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$^circ$$end{document}C at a flow rate of 4 slm, which will not cause damage to living tissues. The diameter of inhibition zone is directly extended with increased exposure time. We confirmed that the inactivation mechanism was unaffected by UV irradiation. In addition, we concluded that the major reasons for the inactivation process of bacteria is because of the action of the reactive oxygen and nitrogen species which formed from ambient air, while the charged particles played a minor role in the inactivation process.Journal of Theoretical and Applied Physics (JTAP)Time-dependent one-dimensional simulation of atmospheric dielectric barrier discharge in N2/O2/H2O using COMSOL MultiphysicsVolume 12 (2018)Issue 1, March and April 201820231117Time-dependent one-dimensional simulation of atmospheric dielectric barrier discharge in N2/O2/H2O using COMSOL Multiphysics10.1007/s40094-018-0281-4ENFarshadSohbatzadehDepartment of Atomic and Molecular Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar, IranHamedSoltaniDepartment of Atomic and Molecular Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar, IranJournal Article20231117AbstractThe results of time-dependent one-dimensional modelling of a dielectric barrier discharge (DBD) in a nitrogen–oxygen–water vapor mixture at atmospheric pressure are presented. The voltage–current characteristics curves and the production of active species are studied. The discharge is driven by a sinusoidal alternating high voltage–power supply at 30 kV with frequency of 27 kHz. The electrodes and the dielectric are assumed to be copper and quartz, respectively. The current discharge consists of an electrical breakdown that occurs in each half-period. A detailed description of the electron attachment and detachment processes, surface charge accumulation, charged species recombination, conversion of negative and positive ions, ion production and losses, excitations and dissociations of molecules are taken into account. Time-dependent one-dimensional electron density, electric field, electric potential, electron temperature, densities of reactive oxygen species (ROS) and reactive nitrogen species (RNS) such as: O, O−, O+, O2-documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ { ext{O}}_{2}^{ - } $$end{document}, O2+documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ { ext{O}}_{2}^{ + } $$end{document}, O3, N,N2+documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ { ext{N}}, { ext{N}}_{2}^{ + } $$end{document}, N2s and N2-documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ { ext{N}}_{2}^{ - } $$end{document} are simulated versus time across the gas gap. The results of this work could be used in plasma-based pollutant degradation devices.Journal of Theoretical and Applied Physics (JTAP)Study of electromagnetic solitons excited by different profile pulsesVolume 12 (2018)Issue 1, March and April 201820231117Study of electromagnetic solitons excited by different profile pulses10.1007/s40094-018-0284-1ENAparnaSharmaPlasma Waves and Particle Acceleration Laboratory, Indian Institute of Technology Delhi, New Delhi 110016, IndiaHitendraK. MalikPlasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India0000-0002-9432-8140HarishKumarDepartment of Mathematics, IIT Delhi, New Delhi 110016, IndiaJournal Article20231117AbstractIn the present paper, we see the effect of shapes of perturbing pulses on the evolution of electromagnetic solitons in a plasma having nonrelativistic ions and electrons. For this, we make use of IMEX scheme in our simulations, which is an invariant scheme for the two-fluid plasma flow equations. In particular, the impact of ion-to-electron mass ratio, electron-to-ion temperature ratio and the width of perturbing pulse is examined on the phase velocity, peak amplitude and width of the solitons.Journal of Theoretical and Applied Physics (JTAP)Linear and nonlinear behavior in single-ring resonatorsVolume 12 (2018)Issue 1, March and April 201820231117Linear and nonlinear behavior in single-ring resonators10.1007/s40094-018-0285-0ENAbdolkarimAfroozehDepartment of Engineering, University of Larestan, Lar, IranJournal Article20231117AbstractThis study has been focused on the linear and nonlinear behavior and investigative in single-ring resonator. Optical fiber ring resonators have great interest due to different applications, especially in communication, secured communication, slow light, fast light and light storage in optical buffers. There are many proposed applications of optical ring resonators. Optical fiber ring resonators can be readily constructed from standard optical fiber components, which allow their properties to be studied in a systematic manner. In this paper, we describe our studies of the optical transmission, intensity, shift phase and group delay characteristics of a family of such devices. In this case, Gaussian beam has been used as an input pulse inside to microring resonators. In this paper, transmission, intensity, shift phase and group delay characteristics of device have been investigated. It has been compared together in different coupling coefficients in frame of linear and nonlinear.