Naderi E.,Razi University |
Narimani H.,Islamic Azad UniversityKermanshah |
Fathi M.,Islamic Azad UniversityKermanshah |
Narimani M.R.,Missouri University of Science and Technology
Applied Soft Computing Journal | Year: 2017
Management and scheduling of reactive power resources is one of the important and prominent problems in power system operation and control. It deals with stable and secure operation of power systems from voltage stability and voltage profile improvement point of views. To this end, a novel Fuzzy Adaptive Heterogeneous Comprehensive-Learning Particle Swarm Optimization (FAHCLPSO) algorithm with enhanced exploration and exploitation processes is proposed to solve the Optimal Reactive Power Dispatch (ORPD) problem. Two different objective functions including active power transmission losses and voltage deviation, which play important roles in power system operation and control, are considered in this paper. In order to authenticate the accuracy and performance of the proposed FAHCLPSO, it applied on three different standard test systems including IEEE 30-bus, IEEE 118-bus and IEEE 354-bus test systems with six, fifty-four and one-hundred-sixty-two generation units, respectively. Finally, outcomes of the proposed algorithm are compared with the results of the original PSO and those in other literatures. The comparison proves the supremacy of the proposed algorithm in solving the complex optimization problem. © 2017 Elsevier B.V.
Kamarian S.,Islamic Azad UniversityKermanshah |
Salim M.,Amirkabir University of Technology |
Dimitri R.,University of Salento |
Tornabene F.,University of Bologna
International Journal of Mechanical Sciences | Year: 2016
In the present work, a free vibration analysis of Carbon Nanotube-Reinforced Composite (CNTRC) conical shells is performed considering the agglomeration effect of Carbon Nanotubes (CNTs). The material properties of the nanocomposite conical shell are estimated employing the Eshelby-Mori-Tanaka approach based on an equivalent fiber assumption. The numerical results are compared with the experimental data available from the literature. The equations of motion are derived based on the First-order Shear Deformation Theory (FSDT). The Generalized Differential Quadrature (GDQ) technique is originally implemented to solve the governing equations of the problem and to obtain the natural frequencies of the structures, since it has proven to be an efficient and accurate numerical tool. A parametric study is herein developed to investigate the influence of some characteristic parameters on the vibrational behavior of the CNTRC conical shell, e.g. the CNTs volume fraction and agglomeration, or the boundary conditions and geometrical parameters like the thickness to radius ratio. Based on results, it is found that agglomeration of CNTs plays a significant role on the natural frequency of the structure. © 2016 Elsevier Ltd. All rights reserved.
TAlu S.,Technical University of Cluj Napoca |
Bramowicz M.,University of Warmia and Mazury |
Kulesza S.,University of Warmia and Mazury |
Ghaderi A.,Islamic Azad UniversityKermanshah |
And 4 more authors.
Journal of Microscopy | Year: 2016
This paper analyses the three-dimensional (3-D) surface texture of growing diamond nanocrystals on Au thin films as catalyst on p-type Si substrate using hot filament chemical vapour deposition (HFCVD). Rutherford backscattering spectrometry (RBS), atomic force microscopy (AFM), Raman, X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were applied also to characterize the 3-D surface texture data in connection with the statistical, and fractal analyses. This type of 3-D morphology allows a deeper understanding of structure/property relationships and surface defects in prepared samples. Our results indicate a promising way for preparing high-quality diamond nanocrystals on Au thin films as catalyst on p-type Si substrate via HFCVD method. © 2016 The Authors Journal of Microscopy © 2016 Royal Microscopical Society
Amirian M.,Islamic Azad UniversityKermanshah |
Karimi G.,Razi UniversityKermanshah |
Lalbakhsh A.,Islamic Azad UniversityKermanshah |
Bayati M.-S.,Razi UniversityKermanshah
Microelectronics Journal | Year: 2015
Abstract A compact differential band pass filter with asymmetric parallel-coupled lines (APCL) and center frequency of 5.6 GHz is proposed in this paper. The APCL suppresses unwanted RFID signals by introducing a fully tunable notched band at 6.8 GHz. By combining the concept of transmission matrix with modal analysis and extracting a novel model for symmetric three parallel coupled lines (SPCL), role of each resonant frequency is clearly explained. Measurement results in the differential mode show a pass band from 3.1 to 8.1 GHz and a wide stop band from 9.1 to 16 GHz with attenuation of more than 20 dB. In addition, S21 in common mode is lower than -10.5 dB over the pass band. © 2015 Elsevier Ltd.
Kahrarian M.,Islamic Azad UniversityKermanshah |
Baltanas R.M.,University of Cordoba, Spain |
Monshizadeh M.R.,Islamic Azad UniversityKermanshah |
Shenavaee M.R.,Islamic Azad UniversityKermanshah
Entomologia Generalis | Year: 2014
In this study, we investigated the fauna of Lepismatidae in different regions of Kermanshah province (Kermanshah, Sar-e-pol-e- Zahab, Paveh and Eslamabad-e-gharb counties) during 2012 and 2013. The specimens were collected by hand or with an entomological aspirator from leaf litter, under rocks and in different parts of the house. Totally 7 species were found, belonging to 5 genera and 3 subfamilies. The species, Ctenolepisma rothschildi, Thermobia aegyptiaca, Allacrotelsa kraepelini and Neoasterolepisma evansi are new records for the fauna of Iran. © 2014 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.
Bagheri G.,Islamic Azad UniversityKermanshah |
Hosseini S.E.,University of Technology Malaysia
Energy Conversion and Management | Year: 2015
Abstract Flame stability and thermal performance of two different heat recirculation micro-combustors (inner reactor heat recirculation (IHR) and outer reactor heat recirculation (OHR)) are investigated using computational fluid dynamics (CFD) and compared together. A two-dimensional steady state CFD model including temperature dependent properties, laminar flow and transport, one step chemical reaction, surface-to-surface radiation, and heat conduction within solid walls has been carried out to assess flame propagation velocity, flame thickness, excess enthalpy, heat loss, and emitter efficiency. It is observed that both cases significantly extend flammability and blow-off limits due to preheating of the reactive mixture. The maximum flame propagation velocities of IHR and OHR in stoichiometric mixture are predicted 160.2 cm/s and 126.1 cm/s, respectively. It is found that super-adiabatic flame temperature takes place when dimensionless excess enthalpy is positive and it is maximum in the stoichiometric equivalence ratio. Heat loss can be varied from 245.8 to 248.6 W for IHR and from 249.6 to 254 W for OHR configuration. Therefore, there is a relative improvement in the Thermal quenching limit of IHR. It is concluded that IHR micro-combustor profoundly affects flame characteristic and stability, but OHR presents a higher range of emitter efficiency. © 2015 Elsevier Ltd.