Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Calculation of differential and total cross sections for Positrion-Hydrogen impact with second-order Born-Faddeev approximation in excitation channel Calculation of differential and total cross sections for Positrion-Hydrogen impact with second-order Born-Faddeev approximation in excitation channel 123 132 1073 FA R Fathi Journal Article 2019 11 26 In this paper, we have implemented a three-body formalism, where the interaction potential is replaced by the transition matrix, in the excitation channel for the collision of positron and atomic hydrogen. Differential and total cross sections are calculated while the first and second order terms of the FWL (Faddeev-Watson-Lovelace) series in the transition from ground state to the first excited state of atomic hydrogen are included. The impact energy range of to and the scattering angle of the scattered positron in the range of (1-180) degrees are selected. At last, the results are compared with the available theoretical data in the literature In this paper, we have implemented a three-body formalism, where the interaction potential is replaced by the transition matrix, in the excitation channel for the collision of positron and atomic hydrogen. Differential and total cross sections are calculated while the first and second order terms of the FWL (Faddeev-Watson-Lovelace) series in the transition from ground state to the first excited state of atomic hydrogen are included. The impact energy range of to and the scattering angle of the scattered positron in the range of (1-180) degrees are selected. At last, the results are compared with the available theoretical data in the literature three-body impact differential cross Section positron excitation channel Faddeev https://ijpr.iut.ac.ir/article_1073_c63c62ac30a9eb6d78fd85e8ea6fed22.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Extraordinary high spectral sensitivity in surface plasmon resonance sensor by multi-mode sensing scheme formeasuring the thickness of an adsorbed layer of specific refractive index Extraordinary high spectral sensitivity in surface plasmon resonance sensor by multi-mode sensing scheme formeasuring the thickness of an adsorbed layer of specific refractive index 133 138 1074 FA H Mohammadhosseini A Ahmadkhan Kordbacheh M Ghanaatshoar Journal Article 2019 11 26 In this paper surface plasmon resonance sensor is studied by using gold and silver in its structure respectively, also the possibility of extraordinary high spectral sensitivity by using multimode sensing scheme is being investigated in this sensor. It is shown that due to the extraordinary high spectral sensitivity of surface plasmon resonance sensor measuring adsorbate layer thickness could be done effectively In this paper surface plasmon resonance sensor is studied by using gold and silver in its structure respectively, also the possibility of extraordinary high spectral sensitivity by using multimode sensing scheme is being investigated in this sensor. It is shown that due to the extraordinary high spectral sensitivity of surface plasmon resonance sensor measuring adsorbate layer thickness could be done effectively spectral sensitivity surface plasmon resonance sensor multimode sensing scheme https://ijpr.iut.ac.ir/article_1074_878f4351e455c9b65d2b1ebd02c7bc3d.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Engineering photonic band gap in 1D phonic crystals using fresnel coefficients and comparing with the results of transfer matrix meghod Engineering photonic band gap in 1D phonic crystals using fresnel coefficients and comparing with the results of transfer matrix meghod 139 146 1075 FA A Rahmatnezamabad S Roshanentezar H Afkhami B Rahmatnezamabad Journal Article 2019 11 26 In this paper photonic band gaps of 1D photonic crystal are compared by using transfer matrix method and Fresnel coefficients method. In Fresnel coefficients method, the refractive indices of each layer and incidence light angle to the surface are used for calculating Fresnel coefficients, and then the necessary and sufficient condition for a 100% reflection from the surface of double layer dielectrics is applied in such a way that reflection coefficient tends to unity so that photonic band gaps are determined. But in transfer matrix method there are some complications needed for solving quadratic partial differential equations and applying continuity of tangent components of fields and Bloch’s condition, though the results are the same In this paper photonic band gaps of 1D photonic crystal are compared by using transfer matrix method and Fresnel coefficients method. In Fresnel coefficients method, the refractive indices of each layer and incidence light angle to the surface are used for calculating Fresnel coefficients, and then the necessary and sufficient condition for a 100% reflection from the surface of double layer dielectrics is applied in such a way that reflection coefficient tends to unity so that photonic band gaps are determined. But in transfer matrix method there are some complications needed for solving quadratic partial differential equations and applying continuity of tangent components of fields and Bloch’s condition, though the results are the same photonic crystals Fresnel coefficients reflection coefficient transfer matrix band gap https://ijpr.iut.ac.ir/article_1075_1aff252d97e69b3e168353dc5c5f9bcd.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Optical and structural properties of ZnO hexagonal rods prepared by thermal chemical vapor deposition technique Optical and structural properties of ZnO hexagonal rods prepared by thermal chemical vapor deposition technique 148 153 1076 FA A Reyhani M. R Khanlary V Vahedi Journal Article 2019 11 26 In this research, ZnO nanostructure hexagonal pyramid rods with high optical and structural quality were synthesized by the simple thermal chemical vapor deposition of Zn powder without a metal catalyst. Surface morphologies were characterized by scanning electron microscopy (SEM). XRD analyses demonstrated that ZnO hexagonal pyramid rods had a wurtzite structure with the orientation of (002). Investigation of optical properties of samples by photoluminescence spectrum exhibited a sharp UV emission peak at 380nm. The quality and composition of the ZnO pyramid rods were characterized using the Fourier transform infrared spectrum (FTIR) at room temperature. In addition, the growth mechanism of ZnO hexagonal rods is also briefly discussed. In this research, ZnO nanostructure hexagonal pyramid rods with high optical and structural quality were synthesized by the simple thermal chemical vapor deposition of Zn powder without a metal catalyst. Surface morphologies were characterized by scanning electron microscopy (SEM). XRD analyses demonstrated that ZnO hexagonal pyramid rods had a wurtzite structure with the orientation of (002). Investigation of optical properties of samples by photoluminescence spectrum exhibited a sharp UV emission peak at 380nm. The quality and composition of the ZnO pyramid rods were characterized using the Fourier transform infrared spectrum (FTIR) at room temperature. In addition, the growth mechanism of ZnO hexagonal rods is also briefly discussed. zinc oxide nanostructure hexagonal pyramid rods thermal chemical vapor deposition optical and structural properties https://ijpr.iut.ac.ir/article_1076_5f7e621e992c71a340885be904a02388.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Fabrication of polymer Schottky diode with Al-PANI/MWCNT-Au structure Fabrication of polymer Schottky diode with Al-PANI/MWCNT-Au structure 154 160 1077 FA A Hajibadali M Baghaei Nejhad GH Farzi Journal Article 2019 11 26 In this research, Schottky diode with Al-PANI/MWCNT-Au structure was fabricated using spin coating of composite polymer and physical vapor deposition of metals. For this purpose, a thin layer of gold was coated on glass and then composite of polyaniline/multi-walled carbon nanotube was synthesized and spin-coated on gold layer. Finally, a thin layer of aluminum was coated on polymer layer. The current-voltage characteristics of diode were studied and found that I-V curve is nonlinear and nonsymmetrical, showing rectifying behavior. I-V characteristics plotted on a logarithmic scale for Schottky diode showed two distinct power law regions. At lower voltages, the mechanism follows Ohm’s Law and at higher voltages, the mechanism is consistent with space charge limited conduction (SCLC) emission. The parameters extracted from I-V characteristics were also calculated. In this research, Schottky diode with Al-PANI/MWCNT-Au structure was fabricated using spin coating of composite polymer and physical vapor deposition of metals. For this purpose, a thin layer of gold was coated on glass and then composite of polyaniline/multi-walled carbon nanotube was synthesized and spin-coated on gold layer. Finally, a thin layer of aluminum was coated on polymer layer. The current-voltage characteristics of diode were studied and found that I-V curve is nonlinear and nonsymmetrical, showing rectifying behavior. I-V characteristics plotted on a logarithmic scale for Schottky diode showed two distinct power law regions. At lower voltages, the mechanism follows Ohm’s Law and at higher voltages, the mechanism is consistent with space charge limited conduction (SCLC) emission. The parameters extracted from I-V characteristics were also calculated. Schottky diode polyaniline multi-walled carbon nanotube spin coat https://ijpr.iut.ac.ir/article_1077_a71c5a143df24982ac4ae5aa3595b17c.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Investigation of SiO2 thin films dielectric constant using ellipsometry technique Investigation of SiO2 thin films dielectric constant using ellipsometry technique 161 166 1078 FA P Sangpour K Khosravy M Kazemzad Journal Article 2019 11 26 In this paper, we studied the optical behavior of SiO2 thin films prepared via sol-gel route using spin coating deposition from tetraethylorthosilicate (TEOS) as precursor. Thin films were annealed at different temperatures (400-600oC). Absorption edge and band gap of thin layers were measured using UV-Vis spectrophotometery. Optical refractive index and dielectric constant were measured by ellipsometry technique. Based on our atomic force microscopic (AFM) and ellipsometry results, thin layers prepared through this method showed high surface area, and high porosity ranging between 4.9 and 16.9, low density 2 g/cm, and low dielectric constant. The dielectric constant and porosity of layers increased by increasing the temperature due to the changes in surface roughness and particle size. In this paper, we studied the optical behavior of SiO2 thin films prepared via sol-gel route using spin coating deposition from tetraethylorthosilicate (TEOS) as precursor. Thin films were annealed at different temperatures (400-600oC). Absorption edge and band gap of thin layers were measured using UV-Vis spectrophotometery. Optical refractive index and dielectric constant were measured by ellipsometry technique. Based on our atomic force microscopic (AFM) and ellipsometry results, thin layers prepared through this method showed high surface area, and high porosity ranging between 4.9 and 16.9, low density 2 g/cm, and low dielectric constant. The dielectric constant and porosity of layers increased by increasing the temperature due to the changes in surface roughness and particle size. ellipsometry sol - gel dielectric constant SiO2 thin film https://ijpr.iut.ac.ir/article_1078_cbf59822817ea55f04d9681a97fea0bd.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Synchronization of the Kuramoto model on the complex networks with bimodal intrinsic frequency distribution Synchronization of the Kuramoto model on the complex networks with bimodal intrinsic frequency distribution 167 177 1079 FA N Khodadoostan T Malakoutikhah F Shahbazi Journal Article 2019 11 26 In this work, we study the Kuramoto model on scale-free, random and small-world networks with bimodal intrinsic frequency distributions. We consider two models: in one of them, the coupling constant of the ith oscillator is independent of the number of oscillators with which the oscillator interacts, and in the other one the coupling constant is renormalized with the number of oscillators with which the oscillator interacts. For the first model, the time which is required for reaching the stationary state is more than the time which is needed in the second one. Also, for both models the order parameter of the random and scale-free network decreases by increasing the intrinsic frequency with a bimodal distribution. Unlike scale-free and random networks, the order parameter of the small-world network increases by increasing the frequency at first. But later, it decreases and then starts to oscillate. In this work, we study the Kuramoto model on scale-free, random and small-world networks with bimodal intrinsic frequency distributions. We consider two models: in one of them, the coupling constant of the ith oscillator is independent of the number of oscillators with which the oscillator interacts, and in the other one the coupling constant is renormalized with the number of oscillators with which the oscillator interacts. For the first model, the time which is required for reaching the stationary state is more than the time which is needed in the second one. Also, for both models the order parameter of the random and scale-free network decreases by increasing the intrinsic frequency with a bimodal distribution. Unlike scale-free and random networks, the order parameter of the small-world network increases by increasing the frequency at first. But later, it decreases and then starts to oscillate. synchronization the Kuramoto model complex networks scale-Free random and small-world https://ijpr.iut.ac.ir/article_1079_d255d7125673b5cf25981c7980fcc091.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Studying stimulated Raman scattering using relativistic Vlasov equation Studying stimulated Raman scattering using relativistic Vlasov equation 179 186 1080 FA M Sharifi A Parvazian Journal Article 2019 11 26 Backward stimulated Raman scattering using one-dimensional relativistic Vlasov code is investigated. For conditions similar to those of Single-Hot-Spot experiments, the growth and saturation of SRS are studied. Analysis of electron distribution function, longitudinal electrostatic fields, transverse electromagnetic fields, and electron density shows that kinetic effects play an important role in the saturation of this instability. SRS amplifies the longitudinal field amplitude and could trap, accelerate, and preheat the electrons. Backward stimulated Raman scattering using one-dimensional relativistic Vlasov code is investigated. For conditions similar to those of Single-Hot-Spot experiments, the growth and saturation of SRS are studied. Analysis of electron distribution function, longitudinal electrostatic fields, transverse electromagnetic fields, and electron density shows that kinetic effects play an important role in the saturation of this instability. SRS amplifies the longitudinal field amplitude and could trap, accelerate, and preheat the electrons. stimulated Raman scattering Vlasov code electrostatic fields electromagnetic fields https://ijpr.iut.ac.ir/article_1080_1a9dc84dea74215500d74ce31b24c503.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 A study on melting process of perylene using molecular dynamics simulation A study on melting process of perylene using molecular dynamics simulation 187 192 1081 FA M Peyvasteh S Setayeshi M Vaez Zadeh R Afzal Zadeh Journal Article 2019 11 26 Melting process of perylene is investigated using molecular dynamics simulation. Some of thermodynamic properties such as potential energy and transition order parameter are calculated as a function of temperature in the range of 500 K-600 K. These calculations are performed by two different methods in NPT and NVT ensembles. The selected interaction potential is Re-squared and the simulations are performed by LAMMPS (a classic molecular dynamics code). The results show that NPT ensemble is more appropraite for the study of melting process than NVT ensemble and shows a good agreement with experimental melting temperature. Melting process of perylene is investigated using molecular dynamics simulation. Some of thermodynamic properties such as potential energy and transition order parameter are calculated as a function of temperature in the range of 500 K-600 K. These calculations are performed by two different methods in NPT and NVT ensembles. The selected interaction potential is Re-squared and the simulations are performed by LAMMPS (a classic molecular dynamics code). The results show that NPT ensemble is more appropraite for the study of melting process than NVT ensemble and shows a good agreement with experimental melting temperature. molecular dynamics melting order parameter re-squared potential phase transition perylene https://ijpr.iut.ac.ir/article_1081_a1b838900456c72d83f0e4696206a030.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 Description of nuclear many-body interactions within the framework of quantum deformation theory Description of nuclear many-body interactions within the framework of quantum deformation theory 193 199 1082 FA E Yaghoubiopour Journal Article 2019 11 26 A fermion realization of compact symplectic algebra provides a natural framework for studying pairing correlations of many-body interactions in nuclei. Here, we use quantum deformation concept in order to describe pairing correlations in atomic nuclei. While the nondeformed limit of the theory provides a reasonable and overall description of certain nuclear properties and fine structure effects, the results show that the q deformation plays a significant role in understanding higher-order effects in the many-body interactions. A fermion realization of compact symplectic algebra provides a natural framework for studying pairing correlations of many-body interactions in nuclei. Here, we use quantum deformation concept in order to describe pairing correlations in atomic nuclei. While the nondeformed limit of the theory provides a reasonable and overall description of certain nuclear properties and fine structure effects, the results show that the q deformation plays a significant role in understanding higher-order effects in the many-body interactions. quantum deformation theory many-body interactions quantum algebra and nucleonic pairing https://ijpr.iut.ac.ir/article_1082_ff3d96bbcfb99f2220e70de7a7860bfa.pdf
Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 14 2 2019 11 26 A study of the electronic conductance in converting a polyacetylene into polystyrene oligomer A study of the electronic conductance in converting a polyacetylene into polystyrene oligomer 201 206 1083 FA H Rabani M Mardani M Mardani 0000-0002-6268-5311 Y Alipour Journal Article 2019 11 26 In this paper, the electronic conductance of a polyacetylene polymer embedded between two simple chains is studied by using transfer matrix method within the tight-binding and first neighbor approach. Also, by adding benzene molecules to polyacetylene we obtain the system conductance in its conversion to polystyrene polymer. The results show that as the number of benzene molecules in the middle of center system increases the conductance in the tunneling area of polyacetylene improves and this area comes close to the resonance area. In contrast, a part of resonance area tends to transform into polystyrene tunneling zone. In this paper, the electronic conductance of a polyacetylene polymer embedded between two simple chains is studied by using transfer matrix method within the tight-binding and first neighbor approach. Also, by adding benzene molecules to polyacetylene we obtain the system conductance in its conversion to polystyrene polymer. The results show that as the number of benzene molecules in the middle of center system increases the conductance in the tunneling area of polyacetylene improves and this area comes close to the resonance area. In contrast, a part of resonance area tends to transform into polystyrene tunneling zone. tight-binding transfer matrix electronic conductance polyacetylene polystyrene https://ijpr.iut.ac.ir/article_1083_484b5584db8a51d58bd998283079a5d7.pdf