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Articles by A. Safari
Total Records ( 3 ) for A. Safari
  S.B. Mortazavi , A. Safari , A. Khavanin , A. Kazemnejad , S.M. Moazzeni and Abbas Rezaee
  Increasing applications of microwave radiation are of great concern with regard to public health. Several studies have been conducted detect effects of microwave exposure genetic material leading to negative or questionable results. The Micronucleus (MN) assay which is proved to be a useful method for detection of radiation exposure- induced cytogenetic damage was used in present study to investigate the genotoxic effect of microwave and toluene alone and in combination in balb/c lymphocytes. The electromagnetic field with two frequencies (980, 950 MHz, 200 KHz Mod), 5 w and 500 ppm Toluene applied for two weeks. Microwave irradiation had no significant effect on frequency of micronucleus induced, but exposure of animals to toluene alone and in combination with microwave have significantly increased the induced micronucleus (p <0.05). Indeed combination exposure of microwave and toluene showed higher rate of micronucleus in comparison with toluene alone. This study indicated that microwave radiation can not induce any significant cytogenetic effects but, in combination with toluene could show synergistic effect.
  R. Jahani , A. Safari , J. Olamaei and H.A. Shayanfar
  This study presents a hybrid genetic and particle swarm optimization algorithms to seek the optimal number and location of FACTS devices in a power system. Unified Power Flow Controller (UPFC) has great flexibility that can control the active and reactive power flow and bus voltages, simultaneously. Decoupled model of the UPFC is applied to maximize the system loadability subject to the transmission line capacity limits and specified voltage level. Optimal placement of UPFC in power system by Hybrid of GA and PSO Algorithm (HGAPSO) algorithm, it leads to a flat voltage profile and increased stability and capacity of the power transmission in lines. At the end, the proof is performed by simulating and testing the 14 bus network and placement of the UPFC appropriately. The results show that the steady state performance of power system can be effectively enhanced due to the optimal location and parameters of the UPFC.
  H. Shayeghi , H.A. Shayanfar and A. Safari
  In this study, optimal tuning of the Thyristor Controlled Series Capacitor (TCSC) damping controller in a multi-machine power system is proposed using Theta-Particle Swarm Optimization (θ-PSO) technique. The design problem was converted to an optimization problem with the time domain-based objective function for a wide range of operating conditions. The effectiveness of the proposed controller is demonstrated on a multi-machine power system through the nonlinear time-domain simulation and some performance indices studies in comparison with the PSO based damping controller. The results analysis revealed that the tuned θ-PSO based TCSC damping controller using the proposed method has an excellent capability in damping power system inter area and local oscillations in comparison with designed Classical PSO (CPSO) based TCSC controller and enhances greatly the dynamic stability of the power system.
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