Islamic Azad University at Marvdasht

www.miau.ac.ir/
Marv Dasht, Iran
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Aghajamali A.,Islamic Azad University at Marvdasht
Applied Optics | Year: 2016

This study theoretically investigates the transmittance properties of a one-dimensional photonic crystal containing magnetized cold plasma and high-temperature superconductor materials. The cutoff frequency, as a function of the magnetic field, electron density of the plasma layer, and temperature, will be investigated. The results illustrate that the temperature, electron density, and variations of the magnetic field affect the cutoff frequency. In addition, the shift trend in the cutoff frequency proves to be dependent on the polarization due to the presence of polarization-dependent magnetized cold plasma. Moreover, in temperature-dependent transmittance, weak oscillation and intensity can be seen at higher temperatures, which is in sharp contrast to low-temperature superconductor-dielectric structures. The proposed structure could certainly provide helpful information for the design of new types of antennas, reflectors, and high-pass filters at microwave frequency. © 2016 Optical Society of America.


Razmkhah H.,Islamic Azad University at Marvdasht
Water Resources Management | Year: 2017

This study compares Severity-Duration-Frequency (SDF) curves (SDFs) of stream flow drought derived from threshold level methods. For this purpose hydrological drought of Roudzard river basin was investigated, based on run theory. Daily runoff data of Mashin hydrometery station (1970–2012) assessed using 70% (Q70), 90% (Q90) of mean daily and 70% of monthly average runoff (monthly) as threshold level methods. Time series of the annual maxima values of duration and volume deficit showed similar trend of increase and decreasing in different thresholds. SDFs were prepared, classifying drought durations to four intervals and fitting statistical distribution to each one. Resulted SDFs showed that, in each period, increasing of duration resulted to increased value of the volume deficit with a non-linear trend while duration and severities from the threshold levels were different. Drought deficit-volume increasing rate was also different in each class of duration-interval. For the additional analysis, the duration-frequency and deficit-frequency curves were also prepared to quantify the extent of drought duration and deficit more. SDFs developed in this study can be used to quantify water deficit for natural stream and reservoir. They could be an effective tool to identify multivariate hydrological drought using severity, duration and frequency. © 2017 Springer Science+Business Media Dordrecht


Saadat H.,Islamic Azad University at Marvdasht
International Journal of Theoretical Physics | Year: 2011

In this article we investigate the relation between the temperature and density of the dark energy. We find that the temperature of the dark universe is proportional to the inverse of dark energy density. Also we discuss some values of the important parameters of the theory. © 2010 Springer Science+Business Media, LLC.


Saadat H.,Islamic Azad University at Marvdasht
International Journal of Theoretical Physics | Year: 2011

In this article we consider the cosmological model based on the holographic dark energy. We study dark energy density in Universe with arbitrary spatially curvature described by the Friedmann-Robertson-Walker metric. We use Chevallier-Polarski-Linder parametrization to specify dark energy density. © 2011 Springer Science+Business Media, LLC.


Esfandiari N.,Islamic Azad University at Marvdasht
Journal of Supercritical Fluids | Year: 2015

The solubility and bioavailability of pharmaceutical compounds are increased via size reduction. The conventional size reduction methods have some disadvantages. The pharmaceutical micronization with supercritical fluids (SCFs) techniques has been proposed. These methods overcome the disadvantages of conventional methods. Therefore, in this work, literature data analysis on the supercritical fluid micronization has been reviewed. The SC carbon dioxide is usually proposed. Micronization with supercritical fluids is classified based on the role of supercritical fluid in a process. Application of these methods for the pharmaceutical micronization has attracted interest in recent year because the micronized particles with narrow particle size distribution and no organic solvent are produced. These methods are rapid expansion of supercritical solutions (RESS) process, gas antisolvent (GAS) process, supercritical antisolvent (SAS) process, solution enhanced dispersion by supercritical (SEDS) process, aerosol solvent extraction system (ASES), supercritical fluid extraction of emulsions (SFEE), and particle from gas saturated solution (PGSS) process. © 2015 Elsevier B.V. All rights reserved.


Saadat H.,Islamic Azad University at Marvdasht
International Journal of Theoretical Physics | Year: 2012

In this paper we consider FRW bulk viscous cosmology in arbitrary space curvature. We extend recent work to the case of non-flat universe in arbitrary space dimension. We obtain Hubble expansion parameter for special cases and study bulk viscous coefficient and deceleration parameter. © 2011 Springer Science+Business Media, LLC.


Saadat H.,Islamic Azad University at Marvdasht
International Journal of Theoretical Physics | Year: 2012

In this paper, we consider holographic Ricci dark energy model, and by using general relativity equations obtain time-dependent density of the Universe. We show that the resulting density in independent of space curvature. © 2011 Springer Science+Business Media, LLC.


Bahmani-Firouzi B.,Islamic Azad University at Marvdasht | Azizipanah-Abarghooee R.,Islamic Azad University at Marvdasht
International Journal of Electrical Power and Energy Systems | Year: 2014

In recent years, due to large integration of Renewable Energy Sources (RESs) like wind turbine and photovoltaic unit into the Micro-Grid (MG), the necessity of Battery Energy Storage (BES) has increased dramatically. The BES has several benefits and advantages in the MG-based applications such as short term power supply, power quality improvement, facilitating integration of RES, ancillary service and arbitrage. This paper presents the cost-based formulation to determine the optimal size of the BES in the operation management of MG. Also, some restrictions, i.e. power capacity of Distributed Generators (DGs), power and energy capacity of BES, charge/discharge efficiency of BES, operating reserve and load demand satisfaction should be considered as well. The suggested problem is a complicated optimization problem, the complexity of which is increased by considering the above constraints. Therefore, a robust and strong optimization algorithm is required to solve it. Herein, this paper proposes a new evolutionary technique named improved bat algorithm that is used for developing corrective strategies and to perform least cost dispatches. The performance of the approach is evaluated by one grid-connected low voltage MG where the optimal size of BES is determined professionally. © 2013 Elsevier Ltd. All rights reserved.


Saadat H.,Islamic Azad University at Marvdasht
International Journal of Theoretical Physics | Year: 2012

In this paper we consider holographic dark energy model with interaction in the flat space-time with non-zero cosmological constant. We calculate cosmic scale factor and Hubble expansion parameter by using the time-dependent dark energy density. Then, we obtain phenomenological interaction between holographic dark energy and matter. We fixed our solution by using the observational data. © 2012 Springer Science+Business Media, LLC.


Azizipanah-Abarghooee R.,Islamic Azad University at Marvdasht
International Journal of Electrical Power and Energy Systems | Year: 2013

This paper presents a novel approach to depict the practical constraints of generator units such as reserve constraints, prohibited operating zones and valve-point effects in the optimal dynamic dispatch problem. Determining the power generation output of units at minimum total fuel cost a dynamic environment with ramp rate limits to satisfy load demand and transmission losses is too complicated and has a lot of local optima in its search space. In addition, the proposed problem has a non-linear, non-convex, non-smooth, multi-modal, non-separable, and non-differentiable nature. In order to overcome above problems a new hybrid technique, based on bacterial foraging and simplified swarm optimization algorithms combined with a new mutation operator and opposition-based initialization is proposed to restraint the premature convergence of the solutions. Therefore, the bacteria in chemo-tactic procedure are moved in short or long steps as well as swimming movements. Furthermore, to increase the diversity of the solution of the search space a novel self-adaptive mutation strategy which profits from four mutation rules is implemented. For more validation the simulation results are applied on four small, medium and large scale systems with 5-unit, 10-unit, 30-unit and 100-unit and compared with those of other methods in the area. © 2013 Elsevier Ltd. All rights reserved.

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