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Tanzadeh J.,Islamic Azad University at Bandar Anzali | Shahrezagamasaei R.,Islamic Azad University at North Tehran
Construction and Building Materials | Year: 2017

Porous Friction Course (PFC) is a hot mix asphalt with coarse-grained and the gap graded aggregate. In porous asphalt, high volume percentage of empty space has a number of advantages, including the creation of proper drainage on the road. On the other hand, the empty space decreases the resistance of the mixtures against rutting compared to mixtures with the dense aggregation. In this study, with the modification of asphalt binder by 4.5 percent of styrene butadiene styrene (SBS) and the amount of 2 and 4 percent of Nano silica and also by adding 0.5 and 1 percent of lime powder and as well as hybrid synthetic fiber to 0.4 and 0.5 percent by weight of asphalt mixtures as filler types, to improve the performance properties of modified porous asphalt mixtures, leading to a reduction in weight loss of asphalt binder and also increase the tensile strength and resistance to rutting. A combination of 0.1 and 0.2 percent of glass fibers with a 0.3 percent of polypropylene fibers, is defined as a type of hybrid fiber. In addition, the least amount of rutting failure occurs in the reinforced porous asphalt, using a combination of 0.2 percent glass fiber and 0.3 percent polypropylene. Also the most appropriate consuming asphalt binder in order to reduce drain down is also equal to 4.5 percent, that for the amount of 4 percent Nano silica in it. Moreover, by adding lime powder content used on the specimens from 0.5 percent to 1 percent, the tensile strength value could be increased about 16.5 percent for reinforced porous asphalt containing 4.5 percent asphalt binder. © 2017 Elsevier Ltd


Asadpour S.H.,Islamic Azad University at Bandar Anzali | Hamedi H.R.,University of Tabriz | Eslami-Majd A.,University of Tabriz | Sahrai M.,University of Tabriz
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2011

The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and control laser fields based on intersubband transitions is investigated. The effect of controlling parameters such as intensity of coupling field and electron tunneling on nonlinear behavior of the system is then discussed. It is shown that the enhanced Kerr nonlinearity with reduced linear and nonlinear absorption can be achieved. © 2011 Elsevier B.V. All rights reserved.


Hamedi H.R.,University of Tabriz | Asadpour S.H.,Islamic Azad University at Bandar Anzali | Sahrai M.,University of Tabriz
Optik | Year: 2013

The linear and nonlinear response of a driven four-level Λ-type atomic system with two fold lower-levels with three driving fields is investigated. It is found that the giant Kerr nonlinearity can be achieved just by tuning the intensity of coupling fields. Maximal Kerr nonlinearity with zero linear and nonlinear absorption enters the EIT window. Also it is found that the relative phase between applied fields can change the Kerr nonlinearity behavior. © 2012 Elsevier GmbH.


Asadpour S.H.,Islamic Azad University at Bandar Anzali | Hamedi H.R.,University of Tabriz
Optical and Quantum Electronics | Year: 2013

A scheme for enhancement of Kerr nonlinearity with vanishing linear and nonlinear absorption in a three-level ladder-configuration n-doped semiconductor quantum well is proposed. It is shown that the Kerr nonlinearity can be controlled and even enhance by the intensity of coupling fields. Also, phase control of Kerr nonlinearity is then discussed. © 2012 Springer Science+Business Media, LLC.


Hossein Asadpour S.,Islamic Azad University at Bandar Anzali | Eslami-Majd A.,University of Tabriz
Journal of Luminescence | Year: 2012

A novel four level atomic configuration is proposed for controlling the optical bistability and transmission coefficient with application on all-optical switching. Two circularly polarized components from a weak linearly-polarized probe beam are interacted separately by two transitions of this medium. A coherent coupling field has derived another atomic transition. It is demonstrated that the transmission coefficient of two orthogonally polarized beams at different frequencies can be achieved by adjusting the magnitude of the external magnetic field. It is found that the threshold of the optical bistability can be controlled by magnitude of the external magnetic field. Also, it is shown that optical bistability can be converted to optical multistability by switching the two orthogonally polarized beams. © 2012 Elsevier B.V.


Hossein Asadpour S.,Islamic Azad University at Bandar Anzali | Reza Hamedi H.,University of Tabriz | Sahrai M.,University of Tabriz
Journal of Luminescence | Year: 2012

Linear and nonlinear response of a four-level N-type atomic system for a weak probe field is investigated. It is demonstrated that the giant Kerr nonlinearity with reduced absorption can be achieved by the spontaneously generated coherence. In addition, the effect of a relative phase between coupling fields on linear and nonlinear absorption as well as Kerr nonlinearity is then discussed. © 2012 Elsevier B.V. All rights reserved.


Asadpour S.H.,Islamic Azad University at Bandar Anzali | Sahrai M.,University of Tabriz | Soltani A.,University of Tabriz | Hamedi H.R.,University of Tabriz
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2012

A novel atom configuration is proposed for a giant Kerr nonlinearity in zero linear and nonlinear probe absorption. It is shown that without coherent control field and just by quantum interference of spontaneous emission, a giant Kerr nonlinearity can be obtained. © 2011 Elsevier B.V. All rights reserved.


Rajabi F.,Islamic Azad University at Bandar Anzali | Ramezani S.,Guilan University
Acta Mechanica Solida Sinica | Year: 2013

A micro scale nonlinear beam model based on strain gradient elasticity is developed. Governing equations of motion and boundary conditions are obtained in a variational framework. As an example, the nonlinear vibration of microbeams is analyzed. In a beam having a thickness to length parameter ratio close to unity, the strain gradient effect on increasing the natural frequency is predominant. By increasing the beam thickness, this effect decreases and geometric nonlinearity plays the main role on increasing the natural frequency. For some specific ratios, both geometric nonlinearity and size effects have a significant role on increasing the natural frequency. © 2013 The Chinese Society of Theoretical and Applied Mechanics.


Babaei H.,Guilan University | Darvizeh A.,Islamic Azad University at Bandar Anzali
Journal of Mechanics of Materials and Structures | Year: 2012

This paper presents an analytical method for determining deflection of fully clamped thin circular plates. The plates are made from a rigid perfectly plastic material and subjected to a transverse localized and uniform blast loading. The essence of the model is to describe the deformation profile with the aid of a zero-order Bessel function and to perform energy analysis. This provides a method for predicting the plastic deformation of circular plates under impulsive loading. It can be also regarded as an attempt to use the energy method for different impulsive loading conditions. Calculations of the cases indicate that the proposed analytical models are based on reasonable assumptions. The solutions obtained are in very good agreement with different sets of experimental results. © 2012 by Mathematical Sciences Publishers.


Rajabi F.,Islamic Azad University at Bandar Anzali | Ramezani S.,Guilan University
Archive of Applied Mechanics | Year: 2012

A microscale nonlinear Bernoulli-Euler beam model on the basis of strain gradient elasticity with surface energy is presented. The von Karman strain tensor is used to capture the effect of geometric nonlinearity. Governing equations of motion and boundary conditions are obtained using Hamilton's principle. In particular, the developed beam model is applicable for the nonlinear vibration analysis of microbeams. By employing a global Galerkin procedure, the ordinary differential equation corresponding to the first mode of nonlinear vibration for a simply supported microbeam is obtained. Numerical investigations show that in a microbeam having a thickness comparable with its material length scale parameter, the strain gradient effect on increasing the beam natural frequency is higher than that of the geometric nonlinearity. By increasing the beam thickness, the strain gradient effect decreases or even diminishes. In this case, geometric nonlinearity plays the main role on increasing the natural frequency of vibration. In addition, it is shown that for beams with some specific thickness-to-length parameter ratios, both geometric nonlinearity and size effect have significant role on increasing the frequency of nonlinear vibration. © 2011 Springer-Verlag.

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