Islamic Azad University at Bandar Anzali

www.bandaranzaliiau.ac.ir
Bandar-e Anzali, Iran
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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


Sahmani S.,Islamic Azad University at Bandar Anzali | Fattahi A.M.,Islamic Azad University at Tabriz
Computer Methods in Applied Mechanics and Engineering | Year: 2017

In comparison with semiconducting carbon structures, the metallic carbon exhibits more novel properties due to their high density of states as well as superconductivity. As a result, prediction of mechanical properties associated with three-dimensional (3D) carbon structures is very attractive. In this paper, the size-dependent nonlinear uniaxial instability of 3D metallic carbon nanosheets containing interlocking hexagonal carbon bonds is investigated based on a novel calibrated nonlocal anisotropic plate model. To accomplish this purpose, Eringen's nonlocal continuum elasticity is incorporated to an exponential shear deformation plate theory. To extract the proper value of nonlocal parameter, the critical buckling loads and associated postbuckling equilibrium curves obtained by the established size-dependent plate model are compared with those of molecular dynamics (MD) simulations corresponding to various nanosheet side lengths and different boundary conditions. It is displayed that the calibrated nonlocal plate model with the proposed proper value of nonlocal parameter equal to 1.12 nm for fully simply supported edge supports and 1.26 nm for fully clamped edge supports has a very good capability to anticipate accurately both of the buckling and postbuckling characteristics of the uniaxially loaded 3D metallic carbon nanosheets. © 2017 Elsevier B.V.


Sahmani S.,Islamic Azad University at Bandar Anzali | Fattahi A.M.,Islamic Azad University at Tabriz
Acta Mechanica | Year: 2017

The nonlinear buckling of thin shell-type structures is sensitive to the initial geometric imperfection. In this study, the imperfection sensitivity of the nonlinear instability of cylindrical nanopanels made of functionally graded material (FGM) is addressed including surface elasticity, aiming to present a background for axial postbuckling behavior of imperfect FGM nanopanels. The material properties are supposed to be graded across the panel thickness in accordance with a simple power law function of the volume fractions of the silicon and aluminum constituents with considering the physical neutral plane position. The non-classical governing differential equations are constructed and then they are deduced to boundary layer-type ones. Afterward, a perturbation-based solution methodology is employed to extract explicit expressions for the size-dependent postbuckling equilibrium paths of FGM nanopanels with and without initial geometric imperfection and corresponding to various panel thicknesses, geometrical parameters, temperature changes and material property gradient indexes. It is displayed that through reduction of the surface elasticity effects for thicker FGM nanopanels, the influence of the initial geometric imperfection on the minimum load of the postbuckling regime increases. This pattern is more significant for FGM nanopanels with a lower value of the material gradient index. © 2017 Springer-Verlag GmbH Austria


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.


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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