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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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.

Malekpour A.R.,Islamic Azad University | Tabatabaei S.,Islamic Azad University at Mahshahr | Niknam T.,Islamic Azad University at Marvdasht
Renewable Energy | Year: 2012

Deregulation and restructuring in power systems, the ever-increasing demand for electricity, and concerns about the environment are the major driving forces for using Renewable Energy Sources (RES). Recently, Wind Farms (WFs) and Fuel Cell Power Plants (FCPPs) have gained great interest by Distribution Companies (DisCos) as the most common RES. In fact, the connection of enormous RES to existing distribution networks has changed the operation of distribution systems. It also affects the Volt/Var control problem, which is one of the most important schemes in distribution networks. Due to the intermittent characteristics of WFs, distribution systems should be analyzed using probabilistic approaches rather than deterministic ones. Therefore, this paper presents a new algorithm for the multi-objective probabilistic Volt/Var control problem in distribution systems including RES. In this regard, a probabilistic load flow based on Point Estimate Method (PEM) is used to consider the effect of uncertainty in electrical power production of WFs as well as load demands. The objective functions, which are investigated here, are the total cost of power generated by WFs, FCPPs and the grid; the total electrical energy losses and the total emission produced by WFs, FCPPs and DisCos. Moreover, a new optimization algorithm based on Improved Shuffled Frog Leaping Algorithm (ISFLA) is proposed to determine the best operating point for the active and reactive power generated by WFs and FCPPs, reactive power values of capacitors, and transformers' tap positions for the next day. Using the fuzzy optimization method and max-min operator, DisCos can find solutions for different objective functions, which are optimal from economical, operational and environmental perspectives. Finally, a practical 85-bus distribution test system is used to investigate the feasibility and effectiveness of the proposed method. © 2011 Elsevier Ltd.

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.

Sarafraz M.M.,Islamic Azad University at Mahshahr | Peyghambarzadeh S.M.,Islamic Azad University at Mahshahr
International Communications in Heat and Mass Transfer | Year: 2012

In this paper, large number of experiments has been performed on saturated pool boiling heat transfer to three different dilute binary mixtures at various heat fluxes (up to 100kW/m 2) and five different concentrations (1-5vol.% of heavier component). The test mixtures include water/glycerol, water/mono-ethylene glycol (MEG), and water/di-ethylene glycol (DEG). The effects of the main operating parameters such as heat flux, concentration, and bubble dynamics on the pool boiling heat transfer coefficient are also investigated. Furthermore, it is shown that physical properties of the mixtures have a considerable effect on the prediction of pool boiling heat transfer coefficients using the available correlations. In almost all of the existing correlations, some physical properties are strongly involved which can be estimated using different thermodynamic models. These models for the calculation of specific heat, density, heat of vaporization, and surface tension do not give exactly similar results and consequently, the heat transfer coefficient obtained from a specified predictive correlation can be tolerated according to the method used for the calculation of the physical properties. This point is usually ignored by investigators and they compare their experimental data with the correlations without reporting which thermodynamic models have to be used for the calculation of the physical properties. In this study, the prediction of Schlünder correlation has been compared with the present experimental data. Results show that the prediction ability of the Schlünder correlation is strongly dependent on the method used for the estimation of the required physical properties. © 2012 Elsevier Ltd.

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.

Sarafraz M.M.,Islamic Azad University at Mahshahr | Peyghambarzadeh S.M.,Islamic Azad University at Mahshahr
Experimental Thermal and Fluid Science | Year: 2013

Experimental studies on subcooled nucleate flow boiling heat transfer of dilute water-diethylene glycol (DEG) mixtures inside a vertical annulus have been conducted. The experimental apparatus provides the particular conditions to investigate the influence of heat flux, flow velocity, degree of subcooling, and concentration of mixture on heat transfer coefficient in both the convection and nucleate boiling regimes. Results reveal that increasing heat flux causes the single phase heat transfer coefficient increases slightly until the incipience of bubble formation. Then, the flow boiling heat transfer coefficient dramatically increases when heat flux increases. Increasing the flow velocity increases the flow boiling heat transfer coefficient. Contrary to the expectations; little increase in the heat transfer coefficient is clearly observed in both of the convective and the nucleate boiling regimes when small amount of DEG was added to the mixture. In addition, liquid inlet temperature to the annulus significantly influences the inception heat flux such that increasing the inlet temperature decreases the inception heat flux. © 2013.

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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