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Rasht, Iran

Islamic Azad University of Lahijan is a campus of Islamic Azad University system in Iran.The university was established in 1988 by some professors of Tehran University of Medical science include Dr. Mir Mozafar Maysoumi who was the first President of the university.So far 16000 students graduated from university. Wikipedia.

Abdolahzadeh Ziabari A.,Islamic Azad University at Lahijan | Rozati S.M.,Guilan University
Physica B: Condensed Matter

Contribution of band edge nonparabolicity to the charge carrier transport in degenerate n-type zinc oxide thin films has been investigated theoretically in order to understand the fundamental aspects of electron scattering in such thin films regardless of precise details of the preparation procedure. To conduct this, the theoretical evaluated results have been compared to the experimental values taken from literatures. The results indicate that the nonparabolicity (introducing through effective mass of charge carriers) has a strong effect on the total mobility of carriers in zinc oxide films so that a satisfactory agreement with experimental data is fulfilled. The dependence of nonparabolicity on bandgap shift is also discussed. Studying the optoelectronic properties of numerous moderately and heavily doped samples revealed that their optical bandgap has lower blueshift than the theoretical value obtained from the well-known Burstein-Moss effect. So, the observed bandgap shift was dependent on the carrier concentration and the total shift of bandgap was evaluated by combining the Burstein-Moss and bandgap narrowing effects. Two different cases were also examined; parabolic and nonparabolic (modified) Burstein-Moss effects. The results show that the modified Burstein-Moss effect leads to great agreement with experimental data. © 2012 Elsevier B.V. Source

Moradi-e-Rufchahi E.O.,Islamic Azad University at Lahijan
Chinese Chemical Letters

In this study, 6-chloro-4-hydroxy-2-quinolone and 6-flouro-4-hydroxy-2-quinolone were synthesized from corresponding dianilides. These compounds were coupled with some diazotized aromatic amines to give the corresponding azo disperse dyes. The structures of the quinolone derivatives and new azo dyes were confirmed by UV-vis, FT-IR, 1H NMR and elemental analysis. © 2010 Enayat O'llah Moradi-e-Rufchahi. Source

Mehdipour S.H.,Islamic Azad University at Lahijan
International Journal of Modern Physics A

We apply the tunneling process of charged massive particles through the quantum horizon of a ReissnerNordström black hole in a new noncommutative gravity scenario. In this model, the tunneling amplitude on account of noncommutativity influences in the context of coordinate coherent states is modified. Our calculation points out that the emission rate satisfies the first law of black hole thermodynamics and is consistent with an underlying unitary theory. © 2010 World Scientific Publishing Company. Source

Mahboub V.,Islamic Azad University at Lahijan
Studia Geophysica et Geodaetica

A method for variance component estimation (VCE) in errors-in-variables (EIV) models is proposed, which leads to a novel rigorous total least-squares (TLS) approach. To achieve a realistic estimation of parameters, knowledge about the stochastic model, in addition to the functional model, is required. For an EIV model, the existing TLS techniques either do not consider the stochastic model at all or assume approximate models such as those with only one variance component. In contrast to such TLS techniques, the proposed method considers an unknown structure for the stochastic model in the adjustment of an EIV model. It simultaneously predicts the stochastic model and estimates the unknown parameters of the functional model. Moreover the method shows how an EIV model can support the Gauss-Helmert model in some cases. To make the VCE theory into EIV model more applicable, two simplified algorithms are also proposed. The proposed methods can be applied to linear regression and datum transformation. We apply these methods to these examples. In particular a 3-D non-linear close to identical similarity transformation is performed. Two simulation studies besides an experimental example give insight into the efficiency of the algorithms. © 2013 Institute of Geophysics of the ASCR, v.v.i. Source

Abdolahzadeh Ziabari A.,Islamic Azad University at Lahijan | Ghodsi F.E.,Guilan University
Journal of Luminescence

Cu doped CdS nanocrystalline thin films were prepared by the sol-gel dip-coating method incorporated in polyethyleneglycol matrix. After heat treatment in air at 250 and 350 C, the prepared thin films were investigated by studying their structural, morphological, compositional, optical (linear and nonlinear) and photoluminescence properties. X-ray diffraction (XRD) results suggest that the samples are polycrystalline in nature with hexagonal crystal structure and the average grain size is in the range of 15-19 nm. The surface morphology of the films was examined by scanning electron microscopy (SEM). The results showed that the films consist of nanocrystalline grains included in the clusters with uniform coverage of the substrate surface. To examine the chemical composition of the films, the X-ray photoelectron spectra (XPS) of the composite films were measured. It was found that the transmittance and the band gap decreased totally as the Cu concentration/annealing temperature increased. The refractive index of the films was studied and the related dispersion was discussed in terms of the Wemple-Didomenico single oscillator model. The third-order nonlinear polarizability of the films was estimated through a semi-empirical relation based on single oscillator model and the results showed that the prepared films are proper to use as optical switch. For photoluminescence (PL) study, 200 and 365 nm excitation wavelengths were examined and compared together. The intensities of emission peaks for the prepared thin films varied with Cu doping/annealing temperature and the behaviors of different band peaks were discussed with giving reasons. © 2013 Elsevier B.V. All rights reserved. Source

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