Calculation of differential and total cross sections for Positrion-Hydrogen impact with second-order Born-Faddeev approximation in excitation channel
R
Fathi
دانشکده فیزیک، دانشگاه شهید باهنر کرمان، کرمان
author
text
article
2019
per
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
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
123
132
https://ijpr.iut.ac.ir/article_1073_c63c62ac30a9eb6d78fd85e8ea6fed22.pdf
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
H
Mohammadhosseini
. دانشکده فیزیک، دانشگاه علم و صنعت ایران، تهران
author
A
Ahmadkhan Kordbacheh
. دانشکده فیزیک، دانشگاه علم و صنعت ایران، تهران
author
M
Ghanaatshoar
. پژوهشکده لیزر و پلاسما، دانشگاه شهید بهشتی، تهران
author
text
article
2019
per
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
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
133
138
https://ijpr.iut.ac.ir/article_1074_878f4351e455c9b65d2b1ebd02c7bc3d.pdf
Engineering photonic band gap in 1D phonic crystals using fresnel coefficients and comparing with the results of transfer matrix meghod
A
Rahmatnezamabad
دانشکده فیزیک، دانشگاه تبریز، تبریز
author
S
Roshanentezar
دانشکده فیزیک، دانشگاه تبریز، تبریز
author
H
Afkhami
گروه فیزیک، دانشگاه شهید مدنی آذربایجان، تبریز
author
B
Rahmatnezamabad
گروه فیزیک، دانشگاه محقق اردبیلی، اردبیل
author
text
article
2019
per
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
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
139
146
https://ijpr.iut.ac.ir/article_1075_1aff252d97e69b3e168353dc5c5f9bcd.pdf
Optical and structural properties of ZnO hexagonal rods prepared by thermal chemical vapor deposition technique
A
Reyhani
گروه فیزیک، دانشکده علوم پایه، دانشگاه بینالمللی امامخمینی (ره)، قزوین
author
M. R
Khanlary
گروه فیزیک، دانشکده علوم پایه، دانشگاه بینالمللی امامخمینی (ره)، قزوین
author
V
Vahedi
گروه فیزیک، دانشکده علوم پایه، دانشگاه بینالمللی امامخمینی (ره)، قزوین
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
148
153
https://ijpr.iut.ac.ir/article_1076_5f7e621e992c71a340885be904a02388.pdf
Fabrication of polymer Schottky diode with Al-PANI/MWCNT-Au structure
A
Hajibadali
دانشکده مهندسی برق و کامپیوتر، دانشگاه حکیم سبزواری، سبزوار
author
M
Baghaei nejhad
دانشکده مهندسی برق و کامپیوتر، دانشگاه حکیم سبزواری، سبزوار
author
GH
Farzi
گروه مهندسی مواد و پلیمر، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری، سبزوار
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
154
160
https://ijpr.iut.ac.ir/article_1077_a71c5a143df24982ac4ae5aa3595b17c.pdf
Investigation of SiO2 thin films dielectric constant using ellipsometry technique
P
Sangpour
پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج
author
K
Khosravy
پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج
author
M
Kazemzad
پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
161
166
https://ijpr.iut.ac.ir/article_1078_cbf59822817ea55f04d9681a97fea0bd.pdf
Synchronization of the Kuramoto model on the complex networks with bimodal intrinsic frequency distribution
N
Khodadoostan
دانشکده فیزیک، دانشگاه صنعتی اصفهان
author
T
Malakoutikhah
دانشکده فیزیک، دانشگاه صنعتی اصفهان
author
F
Shahbazi
دانشکده فیزیک، دانشگاه صنعتی اصفهان
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
167
177
https://ijpr.iut.ac.ir/article_1079_d255d7125673b5cf25981c7980fcc091.pdf
Studying stimulated Raman scattering using relativistic Vlasov equation
M
Sharifi
دانشکده فیزیک، دانشگاه صنعتی اصفهان
author
A
Parvazian
دانشکده فیزیک، دانشگاه صنعتی اصفهان
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
179
186
https://ijpr.iut.ac.ir/article_1080_1a9dc84dea74215500d74ce31b24c503.pdf
A study on melting process of perylene using molecular dynamics simulation
M
Peyvasteh
گروه فیزیک، دانشگاه صنعتی خواجه نصیرالدین طوسی
author
S
Setayeshi
گروه فیزیک، دانشگاه صنعتی خواجه نصیرالدین طوسی
author
M
Vaez Zadeh
گروه فیزیک، دانشگاه صنعتی خواجه نصیرالدین طوسی
author
R
Afzal Zadeh
گروه فیزیک، دانشگاه صنعتی خواجه نصیرالدین طوسی
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
187
192
https://ijpr.iut.ac.ir/article_1081_a1b838900456c72d83f0e4696206a030.pdf
Description of nuclear many-body interactions within the framework of quantum deformation theory
E
Yaghoubiopour
گروه فیزیک، دانشکده علوم، دانشگاه اصفهان
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
193
199
https://ijpr.iut.ac.ir/article_1082_ff3d96bbcfb99f2220e70de7a7860bfa.pdf
A study of the electronic conductance in converting a polyacetylene into polystyrene oligomer
H
Rabani
گروه فیزیک، دانشکده علوم پایه، دانشگاه شهرکرد، شهرکرد
author
M
Mardani
مرکز پژوهشی فناوری نانو، دانشگاه شهرکرد، شهرکرد
author
M
Mardani
مرکز پژوهشی فناوری نانو، دانشگاه شهرکرد، شهرکرد
author
Y
Alipour
گروه فیزیک، دانشکده علوم پایه، دانشگاه شهرکرد، شهرکرد
author
text
article
2019
per
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.
Iranian Journal of Physics Research
Isfahan University of Technology,
The Physics Society of Iran
1682-6957
14
v.
2
no.
2019
201
206
https://ijpr.iut.ac.ir/article_1083_484b5584db8a51d58bd998283079a5d7.pdf