OICC PRESS An experimental study of thermal diffusivity of Au nanoparticles: effects of concentration particle size Volume 10 (2016) Issue 4 2022 12 26 An experimental study of thermal diffusivity of Au nanoparticles: effects of concentration particle size 10.1007/s40094-016-0224-x EN Journal Article 2022 12 26 AbstractIn this article, Au nanoparticles in polyvinylpyrrolidone (PVP) solution were prepared by gamma radiation at different concentrations. The solutions were irradiated at doses of 50 kGy for making different sizes. The average sizes of particle in the prepared samples were measured using the nanophox machine. A dual-beam mode-mismatched thermal lens (TL) method was used to investigate the effect of thermal diffusivity of samples. The TL measurement was carried out using a green diode laser (wavelength 532 nm, 60 mW) and a He–Ne laser (wavelength 632.8 nm, 0.5 mW) for excitation source and probe beam, respectively. The results showed that the thermal diffusivity of samples enhances with the growth of particle size and density of solutions. This increment can be attributed to phonon scattering at interface of particles–liquid and contact between the nanoparticles and surrounded liquid.

OICC PRESS Dyes extracted from Trigonella seeds as photosensitizers for dye-sensitized solar cells Volume 10 (2016) Issue 4 2022 12 26 Dyes extracted from Trigonella seeds as photosensitizers for dye-sensitized solar cells 10.1007/s40094-016-0225-9 EN Journal Article 2022 12 26 AbstractIn this paper, the extract of Trigonella seeds was used as sensitizer for dye-sensitized solar cells (DSSCs). The natural dye was extracted from the seeds using water and alcohol as solvents for the raw material. The UV–Vis absorption spectra of Trigonella extract solution and dye adsorbed on TiO2 film were measured. DSSCs sensitized by Trigonella extracted using water as a solvent exhibited better performance with efficiency of 0.215 %. The performance of the fabricated DSSCs was attempted to enhance by acid treatment of the FTO substrates with HNO3, H3PO4, and H2SO4. Electrochemical impedance spectroscopy of the fabricated cells was also carried out.

OICC PRESS A study on dust acoustic traveling wave solutions and quasiperiodic route to chaos in nonthermal magnetoplasmas Volume 10 (2016) Issue 4 2022 12 26 A study on dust acoustic traveling wave solutions and quasiperiodic route to chaos in nonthermal magnetoplasmas 10.1007/s40094-016-0226-8 EN Journal Article 2022 12 26 AbstractBifurcations and chaotic behaviors of dust acoustic traveling waves in magnetoplasmas with nonthermal ions featuring Cairns–Tsallis distribution is investigated on the framework of the further modified Kadomtsev–Petviashili (FMKP) equation. The FMKP equation is derived employing the reductive perturbation technique (RPT). Bifurcations of dust acoustic traveling waves of the FMKP equation is presented. Using the bifurcation theory of planar dynamical systems, two new analytical traveling wave solutions for solitary and periodic waves are derived depending on the parameters α,α1,q,ldocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$alpha , alpha _1, q, l$$end{document} and U. Considering an external periodic perturbation, the chaotic behavior of dust acoustic traveling waves is investigated through quasiperiodic route to chaos. The parameter q significantly affects the chaotic behavior of the perturbed FMKP equation.

OICC PRESS Impact of gain compression factor on modulation characteristics of InGaAs/GaAs self-assembled quantum dot lasers Volume 10 (2016) Issue 4 2022 12 26 Impact of gain compression factor on modulation characteristics of InGaAs/GaAs self-assembled quantum dot lasers 10.1007/s40094-016-0227-7 EN Journal Article 2022 12 26 AbstractThis paper investigates the influence of gain compression factor on the modulation response of InGaAs/GaAs self-assembled quantum dot laser based on rate equations. For different gain compression factors the output power-current characteristics, light emissions of quantum dot laser have been simulated and effect of gain compression factor changes on quantum dot laser is illustrated. Also, small and large-signal response of quantum dot lasers is studied and the impact of the gain compression factor is presented. It explains that increase of gain compression factor, decreases small-signal modulation characteristics, nevertheless, improves large-signal response of quantum dot lasers. It helps to generate better laser signal quality, higher eye and smaller jitter. The large-signal behavior of a laser diode determines its capability for digital data transfer. The modulation speed of quantum dot lasers is of specific importance if such lasers are considered for optical communication systems.

OICC PRESS Korteweg–deVries–Burgers (KdVB) equation in a five component cometary plasma with kappa described electrons and ions Volume 10 (2016) Issue 4 2022 12 26 Korteweg–deVries–Burgers (KdVB) equation in a five component cometary plasma with kappa described electrons and ions 10.1007/s40094-016-0228-6 EN Journal Article 2022 12 26 AbstractWe investigate the existence of ion-acoustic shock waves in a five component cometary plasma consisting of positively and negatively charged oxygen ions, kappa described hydrogen ions, hot solar electrons, and slightly colder cometary electrons. The KdVB equation has been derived for the system, and its solution plotted for different kappa values, oxygen ion densities, as well as the temperature ratios for the ions. It is found that the amplitude of the shock wave decreases with increasing kappa values. The strength of the shock profile decreases with increasing temperatures of the positively charged oxygen ions and densities of negatively charged oxygen ions.

OICC PRESS Multi-dimensional instability of dust-ion-acoustic solitary structure with opposite polarity ions and non-thermal electrons Volume 10 (2016) Issue 4 2022 12 26 Multi-dimensional instability of dust-ion-acoustic solitary structure with opposite polarity ions and non-thermal electrons 10.1007/s40094-016-0229-5 EN Journal Article 2022 12 26 AbstractAn attempt has been made to study the multi-dimensional instability of dust-ion-acoustic (DIA) solitary waves (SWs) in magnetized multi-ion plasmas containing opposite polarity ions, opposite polarity dusts and non-thermal electrons. First of all, we have derived Zakharov-Kuznetsov (ZK) equation to study the DIA SWs in this case using reductive perturbation method as well as its solution. Small-k perturbation technique was employed to find out the instability criterion and growth rate of such a wave which can give a guideline in understanding the space and laboratory plasmas, situated in the D-region of the Earth’s ionosphere, mesosphere, and solar photosphere, as well as the microelectronics plasma processing reactors.

OICC PRESS DFT study of hydrogen fluoride and sulfur trioxide interactions on the surface of Pt-decorated graphene Volume 10 (2016) Issue 4 2022 12 26 DFT study of hydrogen fluoride and sulfur trioxide interactions on the surface of Pt-decorated graphene 10.1007/s40094-016-0230-z EN Journal Article 2022 12 26 AbstractIn this study, we investigate the adsorption properties of hydrogen florid (HF) and sulfur trioxide (SO3) on the surface of platinum decorated graphene (PtG) using density functional theory. We found one optimized configuration for HF and two ones for SO3 upon adsorption on the surface of PtG. Our result show significant adsorption on PtG with calculated energy adsorption of −73.6 (−54.2 BSSE) kJ/mol for HF at its only position and −172.4 (−144.8 BSSE) and −62.7 (−53.7 BSSE) kJ/mol for SO3 at its two positions; P1 and P2, respectively), whereas there is weak physisorption of these analytes on pristine graphene (PG). Results of charge analyses reveled interesting net charge transfer; while the direction of charge is from HF to PtG, reverse direction is found for SO3 for its two configurations. To deep understand the concept of adsorption properties, we used orbital analyses including density of states for interaction of mentioned analytes on the surface of PtG.

OICC PRESS Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation Volume 10 (2016) Issue 4 2022 12 26 Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation 10.1007/s40094-016-0231-y EN Journal Article 2022 12 26 AbstractAn approach for frequency stabilization of an ambience-isolated internal-mirror He–Ne laser (632.8 nm) utilizing temperature control of the laser tube with Peltier thermoelectric coolers is demonstrated. Measurements indicate that there are an optimal temperature (23 °C) and an optimal discharge current (5.5 mA) of laser tube for which the laser light power is separately maximized. To prevent the effect of fluctuation of discharge current on the laser stability, an adjustable current source is designed and fabricated so that the current is set to be optimal (5.50 ± 0.01 mA). To isolate the laser tube from the environment, the laser metallic box connected to two Peltier thermoelectric coolers is surrounded by two thermal and acoustic insulator shells. The laser has two longitudinal modes very often. Any change in the frequency of longitudinal modes at the optimal temperature is monitored by sampling the difference of longitudinal modes’ intensities. Therefore, using a feedback mechanism, the current of thermoelectric coolers is so controlled that the frequency of modes stays constant on the gain profile of the laser. The frequency stability is measured equal to 1.17 × 10−9 (∼2700×) for less than 1 min and 2.57 × 10−9 (∼1200×) for more than 1 h.

OICC PRESS Solutions of Morse potential with position-dependent mass by Laplace transform Volume 10 (2016) Issue 4 2022 12 26 Solutions of Morse potential with position-dependent mass by Laplace transform 10.1007/s40094-016-0232-x EN Journal Article 2022 12 26 AbstractIn the framework of the position-dependent mass quantum mechanics, the three dimensional Schrödinger equation is studied by applying the Laplace transforms combining with the point canonical transforms. For the potential analogues to Morse potential and via the Pekeris approximation, we introduce the general solutions appropriate for any kind of position dependent mass profile which obeys a key condition. For a specific position-dependent mass profile, the bound state solutions are obtained through an analytical form. The constant mass solutions are also relived.

OICC PRESS Application of poloidal beta and plasma internal inductance in determination of input power time of Damavand tokamak Volume 10 (2016) Issue 4 2022 12 26 Application of poloidal beta and plasma internal inductance in determination of input power time of Damavand tokamak 10.1007/s40094-016-0233-9 EN Journal Article 2022 12 26 AbstractIn this study, magnetic measurement of poloidal fields were used to determine poloidal beta and plasma internal inductance of Damavand tokamak combination of poloidal beta and plasma internal inductance (βp+li2documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ eta _p+dfrac{l_i}{2}$$end{document}), known as Shafranov parameter, was obtained experimentally in terms of normal and tangential components of the magnetic field. Plasma internal inductance and poloidal beta were obtained using parametrization method based on analytical solution of Grad-Shafranov equation (GSE) and compared with parabolic-like profile of toroidal current density approach for determination of the plasma internal inductance. Finding evolution of βp+li2documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ eta _p+dfrac{l_i}{2}$$end{document} and plasma internal inductance. Finding poloidal beta (Shafranov parameter and internal inductance) and using energy balance equation, thermal energy and energy confinement were determined qualitatively in terms of poloidal beta during a regular discharge of Damavand tokamak.