Islamic Azad University at Mahshahr
Mahshahr, Iran

Islamic Azad University is a private chain of universities in Iran.Headquartered in Tehran, Iran, the Islamic Azad University was founded in 1982 and has an enrollment of 1.3 million students.The university operates a news agency similar to ANA, named "Azad News Agency".Not relying on government funding, it charges students tuition fees. The certificates issued by this university should be recognized upon evaluation by the Ministry of Science and Higher Education. Masters and doctorate programs are offered by the university. Wikipedia.

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Abdeyazdan M.,Islamic Azad University at Mahshahr
Journal of Supercomputing | Year: 2017

Nowadays, there has been a growing interest in investigating and improving the methods used for resource discovery and access in grid systems, the reason could be the important role of resource exploration methods in determining the quality and performance of grid systems. With the development of grid environments and the increase in the number of resources and geographical distribution, finding new algorithms to discover the required resources at a minimized resource discovery timespan is considered an important task. In this study, by using the intelligent resource discovery model as well as the decentralized method, it is shown that the optimal resource may be searched for reservation and allocation with the least number of visited nodes and the minimum time possible. In order to find the quickest path, the proposed algorithm was optimized using the particle swarm optimization algorithm; then it was compared to the BITMAP and Footprint Resource Discovery Tree, which are among the hierarchical methods of resource discovery. According to the results, the number of visited nodes in the proposed method was found be lower than those of other methods. © 2017 Springer Science+Business Media, LLC

Zoveidavianpoor M.,Islamic Azad University at Mahshahr
Journal of Petroleum Science and Engineering | Year: 2017

Elastic rock properties are of particular importance for development of petroleum reservoirs. This paper demonstrates the adoption of an integrated multi-disciplinary practice workflow for determination of rock elastic properties. Since the availability of reliable sonic wave velocity leads to the improvement of determination of elastic rock properties, a rigorous data mining procedure is established to predict compressional wave velocity (Zoveidavianpoor et al., 2013a, 2013b; Zoveidavianpoor, 2014). Then, two empirical correlations are developed for measurement of shear wave velocity (Vs) and static Young's modulus (Es) and the results were compared with the literature. Correlation coefficients are used as criteria for checking whether the given results are appropriate for the purpose. The proposed framework has been applied successfully to a heterogeneous Middle Eastern carbonate reservoir. The predictions were in excellent agreement with the core data. Also, it was observed that the proposed correlations for Vs and Es provide better estimation when compared with the commonly used correlations in carbonate reservoirs. The results support the robustness of the proposed integrated approach for production decisions in developing a mature heterogeneous carbonate reservoir, which had previously not been possible. © 2017 Elsevier B.V.

Anaraki-Ardakani H.,Islamic Azad University at Mahshahr
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2017

We investigated the potential application of the AlN nanotubes (AlNNTs) in Li-ion batteries by means of the density functional theory calculations. To this aim, the interaction of Li atom and Li+ cation with (3,3), (4,4), (5,5), (6,6), and (7,7) armchair AlNNTs was investigated. By decreasing the curvature of these nanotubes, the HOMO and LUMO levels are shifted to lower and higher energies, thereby enlarging the energy gap. It was found that AlNNTs can produce larger cell voltage in comparison to the carbon nanotubes and may be promising candidate for application in the anode electrode of Li-ion batteries. The calculated cell voltage is in the range of 1.66 to 1.84 V which is significantly increased by increasing the diameter of AlNNTs. The adsorptions of Li and Li+ on the exterior surface of AlNNTs are more favorable than those on its exterior surface. We showed that the interaction of atomic Li with the surface of the AlNNT plays the main rule in determining the cell voltage because of its large dependency on the tube diameter. While the interaction of Li+ is nearly independent of the tube diameter because of the electrostatic nature of the interaction. © 2017 Elsevier B.V.

Peyghan A.A.,Islamic Azad University at Tehran | Noei M.,Islamic Azad University at Mahshahr
Computational Materials Science | Year: 2014

We investigated the electronic sensitivity of a BC2N nanotube to a HF molecule by density functional calculations at B3LYP (augmented with an empirical dispersion term) level of theory. It was found that the HF molecule prefers to be weakly adsorbed on the tube with the adsorption energy of 23.1 kcal/mol and without significant effect on its electronic properties. Al and Si dopings into the wall of the tube increase the reactivity of the tube toward the HF molecule, so that calculated adsorption energies are about 92.8 and 73.0 kcal/mol, respectively. Contrary to the Al doping, the Si doping significantly enhances the electronic sensitivity of the tube to the HF molecule. We believe that Si-doped BC2N nanotube can convert the presence of HF molecules to an electrical signal which will be useful in the detection process. © 2013 Elsevier B.V. All rights reserved.

Jahromi H.J.,Islamic Azad University at Mahshahr | Eskandari K.,Damghan University
Structural Chemistry | Year: 2013

Atomic multipole moments derived from quantum theory of atoms in molecules are used to study halogen bonds in dihalogens (with general formula YX, in which X refers to the halogen directly interacted with the Lewis base) and some molecules containing C-X group. Multipole expansion is used to calculate the electrostatic potential in a vicinity of halogen atom (which is involved in halogen bonding) in terms of atomic monopole, dipole, and quadrupole moments. In all the cases, the zz component of atomic traceless quadrupole moments (where z axis taken along Y-X or C-X bonds) of the halogens plays a stabilizing role in halogen bond formation. The effects of atomic monopole and dipole moments on the formation of a halogen bond in YX molecules depend on Y and X atoms. In Br 2 and Cl2, the monopole moment of halogens is zero and has no contribution in electrostatic potential and hence in halogen bonding, while in ClBr, FBr, and FCl it is positive and therefore stabilize the halogen bonds. On the other hand, the negative sign of dipole moment of X in all the YX molecules weakens the corresponding halogen bonds. In the C-X-containing molecules, monopole and dipole moments of X atom are negative and consequently destabilize the halogen bonds. So, in these molecules the quadrupole moment of X atom is the only electrostatic term which strengthens the halogen bonds. In addition, we found good linear correlations between halogen bonds strength and electrostatic potentials calculated from multipole expansion. © 2012 Springer Science+Business Media New York.

Tabatabaei S.,Islamic Azad University at Mahshahr
Journal of Intelligent and Fuzzy Systems | Year: 2014

This paper suggests a new stochastic framework based on 2 m+1 point estimate method (PEM) to solve the mid-term generation scheduling (SMGS) problem. The new formulation makes use of an adaptive modified bat algorithm and a novel self-adaptive wavelet mutation strategy for the establishment of new robust algorithm for the present problem. In addition, this work improves the modeling process of wind-thermal system in the MGS problem by considering the possible uncertainties when scheduling the generators of power system of the problem. The proposed model can concurrently capture the uncertainty effect of load and wind speed variations. The feasibility and efficiency of the proposed method is examined using two test systems. © 2014 - IOS Press and the authors. All rights reserved.

Amirhashchi H.,Islamic Azad University at Mahshahr
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

Locally rotationally symmetric (L.R.S.) Bianchi type II stiff fluid cosmological model is investigated. To get the deterministic model of the universe, we have assumed a supplementary condition A=Bm between metric potentials A and B, where m is a constant. It is shown that the vacuum energy density Λ is positive and proportional to 1t2. The values of deceleration parameter q, matter-energy density Ωm and dark-energy density ΩΛare found to be in good agreement with the values obtain from 5-years WMAP observations. The predicted value of the jerk parameter is in agreement with the SNLS SNIa and X-ray galaxy cluster distance data but it is not match with the SNIa gold sample data. In general, the model represent accelerating, shearing and non-rotating universe. The physical and geometrical behavior of this model is also discussed. © 2011 Elsevier B.V.

Alavi Fazel S.A.,Islamic Azad University at Mahshahr | Mahboobpour M.,Islamic Azad University at Mahshahr
Experimental Thermal and Fluid Science | Year: 2013

Significant interest in formulation of pool boiling heat transfer in liquid mixtures can be found in the literature. In this article, it is aimed to validate the existing models and correlations specifically for boiling of water/monoethyleneglycol binary solution. In this investigation, boiling heat transfer coefficient, bubble departing diameter, bubble departing frequency and nucleation site density have been experimentally investigated in various concentrations and heat fluxes. The experimental data obtained in this investigation shows that the boiling heat transfer coefficients of the case study are much higher than the predicted values by major existing correlations and models. Furthermore, it is shown that the boiling heat transfer coefficient in mixtures of water/monoethyleneglycol is even higher than the ideal boiling heat transfer coefficient; i.e. inclusion of monoethyleneglycol in water significantly enhances the boiling heat transfer coefficient. We hypothesize that the enhancement in boiling heat transfer coefficient is related to bubble dynamics, which is not directly included in the existing models and correlation. A model is then proposed to predict the boiling heat transfer coefficient in water/monoethyleneglycol solution. Proposed formulation presents significantly improved performance compared to studied methods. © 2013 Elsevier Inc.

Alipour R.,Islamic Azad University at Mahshahr
International Review of Mechanical Engineering | Year: 2011

Because of high ductility, aluminum alloys, have been widely used as an important base of metal forming industries. But the main week point of these alloys is their low strength so in forming them with conventional methods like deep drawing, hydro forming, etc have been always faced with problems like fracture during of forming process. Because of this, recently using of explosive forming method for forming of these plates has been recommended. In this paper free explosive forming of A2024 aluminum alloy is numerically simulated and during it, explosion wave propagation process is studied. Consequences of this simulation can be effective in prediction of quality of production. These consequences are compared with an experimental test and show the superiority of this method to similar methods like hydro forming and deep drawing. © 2011 Praise Worthy Prize S.r.l. - All rights reserved.

Amirhashchi H.,Islamic Azad University at Mahshahr
Research in Astronomy and Astrophysics | Year: 2013

A model of a cloud formed by massive strings is used as a source of Bianchi type II cases. We assume that the expansion (θ) in the model is proportional to the shear (σ). To get an exact solution, we consider the equation of state of the fluid to be in the stiff form. It is found that the bulk viscosity played a very important role in the history of the universe. In the presence of bulk viscosity the particles dominate over strings whereas in the absence of it, strings dominate over the particles, which is not consistent with recent observations. Also we observe that the viscosity causes the expansion of the universe to be accelerating. Our models are evolving from an early decelerating phase to a late time accelerating phase. The physical and geometrical behaviors of these models are discussed. © 2013 National Astronomical Observatories of Chinese Academy of Sciences and IOP Publishing Ltd.

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