Islamic Azad University at Ashtian
Markazi, Iran
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Rezaiee A.M.,Islamic Azad University at Ashtian | Karimi A.,Islamic Azad University of Arak
Indonesian Journal of Electrical Engineering and Computer Science | Year: 2016

The main purpose of the present study presents a new model of smart dynamically determine the validity and reliability survey of Internet users bank is using Fuzzy C-Mean model. In other words, the aim of this study is to provide a smart system to determine the behavior of Internet users bank is confidence, so that we can fit the points by the customer, providing banking services to defined limits. In terms of method, a descriptive and exploratory data mining is in use. The method of research was descriptive survey and the use of data mining, exploration. The aim of this study is applied. The survey of methods for qualitative and quantitative data. Since the data of the Agricultural Bank documents (bills of transfer, transfer funds transfers, the number of IT users, foundations, etc.) were collected and interviews with experts in the field of electronic banking Agricultural Bank, Agricultural Bank branch target population for were randomly selected. The results showed that the diagnostic accuracy provided structure to determine the acceptable level of confidence in Internet banking is user behavior. © 2016 Institute of Advanced Engineering and Science. All rights reserved.

Farahani H.F.,Islamic Azad University at Ashtian | Farahani H.F.,Islamic Azad University at Central Tehran
Journal of Cleaner Production | Year: 2017

Plug-in electric vehicles are one of the clean technologies that have many advantages to overcome the problems of power systems for instance voltage unbalance in distribution networks. Considering coordinated or uncoordinated charging method, voltage unbalance factor can be improved or worsened. In real applications, most PEVs are connected to residential or commercial networks in the form of single-phase and they can be charged or discharged that leads to voltage unbalance. In this paper, the effect of PEVs on network voltage unbalance is investigated in the form of optimization problem. VUF is minimized as an objective function in different conditions, subject to network security and PEVs constraints, using PSO algorithm. VUF is minimized by optimally selecting the state of PEVs (charging or discharging), PEV point of connection (phase a, b or c) and charging/discharging rating power. Also, the impact of uncoordinated and coordinated charging of PEVs on VUF is evaluated. Besides, the effectiveness of the proposed framework is studied based on an unbalanced three-phase distribution network. Finally, the obtained results show that coordinated charging/discharging of PEVs can significantly improve VUF value. © 2017

Taherahmadi J.,Islamic Azad University at Ashtian | Jafarian M.,Niroo Research Institute | Asefi M.-N.,Islamic Azad University at Ashtian
IET Renewable Power Generation | Year: 2017

In this study, adaptive control is used to damp network subsynchronous oscillations via doubly fed induction generator (DFIG)-based wind turbines. With an increase in wind power penetration in power systems and with regard to the flexible control of wind turbines, the use of wind turbine systems to improve the dynamic stability of power systems has been of significance importance for researchers. One of the important issues in regards to the stability of power systems are the subsynchronous oscillations. Damping subsynchronous oscillations using wind turbines has been studied in various research effort, mainly by adding a supplementary control loop to the control structure of the wind turbine. In most of the studies, this control loop is composed of linear blocks. In this study, adaptive control is used for this purpose. Since adaptive control parameters tend to optimum values in order to obtain optimum control performance, using this controller will help the wind turbines to have positive contribution in network subsynchronous oscillations damping at different wind speeds and system operating points, as shown in this study. It is also shown that this controller has an insignificant effect on the dynamic performance of the wind turbine, itself. © 2016 The Institution of Engineering and Technology.

Ghadiry M.,Islamic Azad University of Arak | Nadi M.,Islamic Azad University at Ashtian | A'Ain A.K.,University of Technology Malaysia
Circuits, Systems, and Signal Processing | Year: 2013

This paper presents a new 8-bit adder circuit, called discrepant low PDP 8-bit adder (DLPA) based on three new full adder cells, which have been designed based on requirements of different positions in each 8-bit adder circuit. In order to design the full adder cells, a new and general method has been proposed aiming to achieve full-swing output and low number of transistors. The proposed adder along with several state-of-the-art adders from the literature have been extensively analyzed and compared together. The results revealed that the power-delay product of DLPA is almost more than 20 % less than that of other compared circuits. © 2012 Springer Science+Business Media, LLC.

Mahdieh M.,Arak University | Yazdani M.,Islamic Azad University at Ashtian | Mahdieh S.,University of Isfahan
Environmental Monitoring and Assessment | Year: 2013

The major objective of this investigation was to evaluate the potential of scented geraniums, Pelargonium roseum, to uptake and accumulate heavy metals nickel (Ni), cadmium (Cd), or lead (Pb). For this, plants were grown in an artificial soil system and exposed to a range of metal concentrations over a 14-day treatment period. Then, metals from the entire biomass were extracted. The results showed that scented geranium plants accumulated in excess of 20,055 mg of Ni kg-1 dry weight (DW) of root and 10,889 mg of Ni kg -1 DW of shoot, and in excess of 86,566 mg of Pb kg-1 DW for roots and 4,416 mg of Pb kg-1 DW for shoots within 14 days. Also, the uptake and accumulation of cadmium in roots of scented geranium plants increased with the exposure at low (250, 500 mg L-1) and medium level (750 mg L-1) followed by a decline at the highest level (1,000 mg L-1). The highest accumulation in roots (31,267 mg kg-1 DW) was observed in 750 mg L-1 cadmium treatment. In the shoots of scented geraniums, the highest amount of metal accumulation (1,957 mg kg -1 DW) was detected at 750 and 1,000 mg L-1 of cadmium in the culture solution. Finally, since the high concentrations of Ni or Pb accumulated in shoots of scented geranium has far exceeded 0.1 % DW and for Cd has far exceeded 0.01 % DW, P. roseum is a new hyperaccumulator species for these metals and can be used in phytoremediation industry. © 2013 The Author(s).

Farahani H.F.,Islamic Azad University at Ashtian | Rashidi F.,Hormozgan University
International Review of Electrical Engineering | Year: 2010

One of the most important problems in power electronic, especially inverters, is its switching. The amplitude of the harmonics can be reduced by using of multilevel inverters. So it leads to decrease of output current total harmonic distortion (THD). In the multilevel current source (MLCSI) the entire harmonics cannot be removed and some of them can be appeared in the output current. This paper presents a novel method in which combination of chops and short circuit pulses are positioned in such a way that lower order harmonics are eliminated selectively besides current magnitude modulation with minimum switching frequency. Generalized equations which show the relationship of various PWM-SHEM parameters to the position of short circuit pulses and the number of chops per 360° are provided and discussed in details. To verify proposed method, a sample multilevel current source inverter has been designed and simulated in PSPICE. © 2010 Praise Worthy Prize S.r.l. - All rights reserved.

Mohammadi-Ivatloo B.,Islamic Azad University at Ashtian | Moradi-Dalvand M.,Islamic Azad University at Ashtian | Rabiee A.,Islamic Azad University at Ashtian
Electric Power Systems Research | Year: 2013

In this paper a novel time varying acceleration coefficients particle swarm optimization (TVAC-PSO) algorithm is implemented to solve combined heat and power economic dispatch (CHPED) problem. The CHPED problem is a challenging non-convex and non-linear optimization problem. The acceleration coefficients in PSO algorithm are varied adaptively during iterations to improve solution quality of original PSO and avoid premature convergence. The effect of valve-point in cost function considered with adding an absolute sinusoidal term to conventional polynomial cost function. The proposed method is applied to five test cases with different characteristics. Also, a new large scale test case considering valve-points effects is proposed in this paper. The obtained results demonstrate the superiority of the proposed method in solving non-convex and constrained CHPED problem. © 2012 Elsevier B.V. All rights reserved.

Moradi-Dalvand M.,Islamic Azad University at Ashtian | Mohammadi-Ivatloo B.,Islamic Azad University at Ashtian | Najafi A.,Islamic Azad University at Ashtian | Rabiee A.,Islamic Azad University at Ashtian
Electric Power Systems Research | Year: 2012

In this paper a new optimization algorithm is applied for solution of non-convex and large scale economic dispatch (ED) problems. A continuous version of quick group search optimizer (QGSO) algorithm is proposed. A more realistic ED formulation with considering valve-points effect, prohibited operating zones, transmission losses and ramp-rate limits is utilized. The performance of the proposed method is verified by implementation on five test systems. Case studies and numerical examples show that the proposed continuous QGSO algorithm has better solution quality comparing with the most of the latest reported algorithms in the literature. © 2012 Elsevier B.V. All rights reserved.

Heydari M.M.,Islamic Azad University | Heydari M.,Islamic Azad University at Ashtian
Archives of Agronomy and Soil Science | Year: 2014

The Penman-Monteith (FAO-56 PM) equation is suggested as the standard method for estimating evapotranspiration (ET0) by the International Irrigation and Drainage Committee and Food and Agriculture Organization (FAO). On the other hand, the Hargreaves-Samani (HS) equation is an alternative method compared with the FAO-56 PM equation. In the present study, the original coefficient C of the HS equation is calibrated based on the FAO-56 PM equation for estimating the reference ET0 from 15 meteorological stations in central Iran (about 170,000 km2) under semiarid and arid conditions. After calibration, the new values for C are ranged from 0.0018 to 0.0037. The mean bias error (MBE), the root mean square error (RMSE), and the ratio of average estimations of ET0 (R) values for all stations are ranged from 0.12 to 5.38, -5.35 to 1.15 mm d-1 and 0.64 to 1.28 for the HS equation and from 0.12 to 2.48, -2.2 to 0.60 mm d-1, and 1.00 to 1.05 for the calibrated Hargreaves-Samani equation (CHS), respectively. Results indicate that the average RMSE and MBE values are decreased by 40% and 66%, respectively. Relationships for calibrating the C coefficient on the basis of annual average of daily temperature range (ΔT) and wind speed (V) are proposed, calibrated, and validated. Hence, the CHS equation can be used for ET0 estimates with acceptable accuracy instead of the FAO-56 PM method. © 2013 © Taylor & Francis.

Heydari M.M.,Islamic Azad University | Heydari M.,Islamic Azad University at Ashtian
Archives of Agronomy and Soil Science | Year: 2014

Reference evapotranspiration (ET0) can be estimated on basis of pan evaporation data (Epan), whose measurements have the advantage of low cost, simplicity of the measuring equipment, simple data interpretation and application as well as suitability for locations with limited availability of meteorological data. Epan values were converted to ET0 using the pan evaporation coefficient (Kpan). In this study, seven common Kpan equations were evaluated for prediction of ET0 in the growing season (April to October) in arid region of Iran. The Cuenca approach was best suited compared to the standard FAO Penman-Monteith method (FAO-56 PM). © 2013 © Taylor & Francis.

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