Islamic Azad University at Lahijan
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.

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Fazeli R.,Islamic Azad University at Lahijan
Optics Letters | Year: 2016

Detailed calculations show that we can control and enhance x-ray line emission in the so-called water-window wavelength region using laser irradiated nano-porous or foamlike targets. The effects of target porosity on the non-LTE plasma ionization are studied to obtain optimum conditions for maximum narrowband line emission. Results show that for specified irradiation conditions, the population of emitting ions can be significantly improved using a target with optimum initial mass density. In such conditions, an efficient line x ray can be emitted from the created plasma making it a suitable flash point source for highcontrast x-ray imaging of living samples. © 2016 Optical Society of America.

Fazeli R.,Islamic Azad University at Lahijan
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2017

Enhancement of the soft X-ray emission including free–free, free–bound and bound–bound emissions from Au nano-porous targets irradiated by single and double laser pulses is studied through numerical simulations. Laser pulses of duration 2 ns are used in calculations considering different prepulse intensities and a fixed intensity of 1013 Wcm−2 for the main pulse. The effects of prepulse intensity and time separation between laser pulses are studied for targets of different porosities. Results show that the X-ray yield can be enhanced significantly by a nano-porous target having optimum initial density. Such enhancement can be more improved when double laser pulses with appropriate delay time and intensities irradiate nano-porous targets. It is shown that the enhancement will be reduced when the prepulse intensity is greater than a specific value. © 2016 Elsevier B.V.

Mahboub V.,Islamic Azad University at Lahijan | Sharifi M.A.,University of Tehran
Journal of Geodesy | Year: 2013

A weighted total least-squares (WTLS) approach with linear and quadratic constraints is developed. This method is according to the traditional Lagrange approach to optimize the target function of this problem. The WTLS and constrained total least-squares (CTLS) approach had been distinctively investigated, however, these two problems have not been simultaneously considered yet; furthermore, among the contributions on the CTLS problem, only Schaffrin and Felus considered linear and quadratic constraints together; nevertheless, in many practical examples, some elements of the design/coefficient matrix are fixed and should not be modified and this approach cannot deal with these cases. The main necessity of this research appears after the desirable property of the WTLS approach in preserving the structure of the design matrix was proven by Mahboub. In other words, currently, the WTLS approach is one of the most efficient methods for solving the so-called errors-in-variables model and an attempt for equipping it with constraints seems necessary. Also it is demonstrated that the additional constraints have a 'regularization role' for ill-conditioned problems and the unconstrained solution suffers from ill-conditioning effects which give it an added advantage over the unconstrained WTLS algorithm. Four geodetic applications indicate the significant of this problem in the presence of colored and white noise in the data. © 2012 Springer-Verlag Berlin Heidelberg.

Mehdipour S.H.,Islamic Azad University at Lahijan
Astrophysics and Space Science | Year: 2013

We study some features of entropic force approach in the presence of a noncommutative Schwarzschild-deSitter black hole. In this setup, there exists a similarity between the small and large scales. There are two finite cut-off in very short and long distances wherein the force and energy graph stop abruptly at those scales. We find that the existence of a deSitter core around the origin, induced by noncommutativity, in addition to a standard deSitter background at large scale may lead to a violation of the equivalence principle. Finally in order to directly observe the finite cut-off at short-scale gravity, caused by noncommutativity quantum fluctuations, we derive an effective gravitational constant. © 2013 Springer Science+Business Media Dordrecht.

Mehdipour S.H.,Islamic Azad University at Lahijan
International Journal of Modern Physics A | Year: 2010

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.

Mahboub V.,Islamic Azad University at Lahijan
Studia Geophysica et Geodaetica | Year: 2014

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.

Moradi-e-Rufchahi E.O.,Islamic Azad University at Lahijan
Chinese Chemical Letters | Year: 2010

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.

Mehdipour S.H.,Islamic Azad University at Lahijan
Astrophysics and Space Science | Year: 2014

We present some well-known energy-momentum complexes and evaluate the gravitational energy associated with static spherically symmetric spacetimes. In fact, the energy distribution of the aforementioned gravitational background that is contained in a two-sphere of radius r shows that a test particle situated at a finite distance r experiences the gravitational field of the effective gravitational mass. In addition, we apply Verlinde's entropic gravity to find the emergent gravitational energy on static spherically symmetric screens. In this setup, we find that the energy distribution in the prescription of Møller is similar to the energy derived from the emergent gravity, while other prescriptions give the different results. This result may confirm the argument of Lessner who argues that Møller's definition of energy is a powerful concept of energy in General Relativity. © 2014 Springer Science+Business Media Dordrecht.

Mehdipour S.H.,Islamic Azad University at Lahijan
Canadian Journal of Physics | Year: 2012

Using the noncommutative geometry inspired Vaidya metric obtained in terms of coordinate coherent states and also utilizing the generalized uncertainty principle (GUP), we show that the nonthermal nature of the Hawking spectrum leads to Planck-scale nonthermal correlations between emitted modes of evaporation. Our analysis thus exhibits that owing to self-gravitational effects plus noncommutativity and GUP influences, information can emerge in the form of Planck-scale correlated emissions from the black hole. © 2012 Published by NRC Research Press.

Mehdipour S.H.,Islamic Azad University at Lahijan
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

In the context of a noncommutative model of coordinate coherent states, we present a Schwarzschild-like metric for a Vaidya solution instead of the standard Eddington-Finkelstein metric. This leads to the appearance of an exact (t-r) dependent case of the metric. We analyze the resulting metric in three possible causal structures. In this setup, we find a zero remnant mass in the long-time limit, i.e. an instable black hole remnant. We also study the tunneling process across the quantum horizon of such a Vaidya black hole. The tunneling probability including the time-dependent part is obtained by using the tunneling method proposed by Parikh and Wilczek in terms of the noncommutative parameter σ. After that, we calculate the entropy associated to this noncommutative black hole solution. However, the corrections are fundamentally trifling; one could respect this as a consequence of quantum inspection at the level of semiclassical quantum gravity. © 2010 The American Physical Society.

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