Hamadan, Iran

Bu - Ali Sina University

www.basu.ac.ir
Hamadan, Iran

Buali Sina University, also written Bu-Ali Sina University, is a university in the city of Hamedan in Hamedan province of Iran. The university was first established with the assistance of France in February 1973. It is one of the best universities of Iran. For example, Buali Sina University is in the same class as of Isfahan University of Technology, Tabriz University, and Ferdowsi University of Mashhad. Its most popular, prominent and high quality programs are in the fields of Chemistry, Civil Engineering, Mechanical Engineering, and Agricultural Engineering. Wikipedia.

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Alibeigloo A.,Bu - Ali Sina University
Composite Structures | Year: 2010

Three-dimensional thermo-elastic analysis of functionally graded (FG) rectangular plates with simply supported edges subjected to thermo-mechanical loads are carried out in this paper. The thermo-elastic constants of the plate were assumed to vary exponentially through the thickness, and the Poisson ratio was held constant. Analytical solutions for the temperature, stress and displacement fields are derived by using the Fourier series and state-space method. To verify the accuracy of the present work, a comparison is made with previously published results. The effects of temperature change, applied mechanical load, gradient index, aspect ratio and thickness to length ratio on the behavior of the plate are examined. © 2009 Elsevier Ltd. All rights reserved.


Alibeigloo A.,Bu - Ali Sina University
Composite Structures | Year: 2010

This paper presents analytical solution for functionally graded material (FGM) beams integrated with piezoelectric actuator and sensor under an applied electric field and thermo-mechanical load. In FGM host properties is assumed to vary exponentially in thickness direction and the Poisson's ratio is held constant. The hybrid beam is in a state of plane stress and the piezoelectric is composed of orthotropic materials. The beam is simply supported with the bottom surface traction free and zero temperature. By using of state-space method in thickness direction and Fourier series in longitudinal direction, the solution can be made. To verify the accuracy of the present formulation, numerical results for the simple case is compared with results obtained in the published literature. Finally, effects of FGM index, electromechanical coupling, thickness ratio and thermo-mechanical surface boundary condition on the bending behaviour of beam are investigated. © 2009 Elsevier Ltd. All rights reserved.


We study infinitesimal axisymmetric deformations of a functionally graded shell with piezoelectric layers perfectly bonded to its inner and outer surfaces, and the hybrid structure subjected to thermo-electro-mechanical loads. The material properties of the shell are assumed to be graded in the radial direction according to a power law but Poisson's ratio is assumed to be constant. For simply-supported and grounded edges kept at a constant temperature, the problem is analyzed analytically by assuming a Navier type solution for the governing equations and the state space method for solving the resulting ordinary differential equations. Numerical results are given to illuminate influences of the mechanical and the electrical boundary conditions, the exponent of the power law variation, and the radius to thickness ratio. © 2010 Elsevier Ltd.


Rezaeivala M.,Hamedan University of Technology | Keypour H.,Bu - Ali Sina University
Coordination Chemistry Reviews | Year: 2014

In this paper, there is an attempt to review the developments in the design and synthesis of pyridine containing [1+1] and [2+2] macrocyclic Schiff base ligands, formed by condensations of 2,6-diacylpyridine or 2,6-diformylpyridine and appropriate polyamines, which utilize the templating capability of different metal ions to direct the synthetic pathway. The reduction of the cyclic Schiff bases to their related amine derivatives is also considered since this leads to more flexible ligands capable of structural elaboration through donor groups. Attention is mainly paid to the synthetic and structural aspects of the resulting metal complexes, particularly to the role of the coordination preferences of the different metal ions in directing the synthesis totally or preferentially toward mono-, di- or poly-nuclear entities. The preparation of functionalized ligands, containing pendant arms, capable of promoting rapid complexation and decomplexation and their use in selective metal ion transportation and separation are also paid attention to. Furthermore, a summary of the new approach of these compounds such as mechanically interlocked molecules, catalytic properties and cofactors and artificial metalloenzymes is reviewed. © 2014 Elsevier B.V.


Farahani M.,Bu - Ali Sina University
IEEE Transactions on Power Systems | Year: 2013

This paper proposes an integrated controller to regulate the terminal voltage of generators as well as to mitigate power system oscillations, instead of employing the combination of the conventional power system stabilizer and automatic voltage regulator. This intelligent controller is an online trained self-recurrent wavelet neural network controller (OTSRWNNC). To achieve the aforementioned objectives, two control errors are simultaneously minimized by updating the parameters of OTSRWNNC. In addition, the adaptive learning rates derived by the discrete Lyapunov theory are used to enhance the convergence speed of proposed controller. The proposed controller does not require any identifier to approximate the dynamic of controlled power system, because of its high learning ability. The performance of proposed controller is evaluated on a single-machine infinite-bus power system and two large power systems. Simulation results and comparative studies demonstrate the effectiveness and robustness of proposed controller in stabilizing power systems in a wide range of loading conditions and different disturbances. © 2012 IEEE.


Raoufi D.,Bu - Ali Sina University
Renewable Energy | Year: 2013

In this work, zinc oxide (ZnO) precursor was prepared by precipitation method from zinc nitrate and ammonium carbonate in aqueous solutions. ZnO nanoparticles were synthesized by annealing the precursor at different temperatures. The effect of the annealing temperature on the particle size and photo-luminescence (PL) properties of the synthesized ZnO nanoparticles were studied by XRD, SEM, BET, TG-DTA and PL measurements. The XRD results indicated that the synthesized ZnO nanoparticles had the pure wurtzite structure. It is found that with increasing the annealing temperature the crystalinity and particle size increases as well as the lattice parameters approaches to those of the XRD standard. The studies of the aggregation of the samples were also carried out by comparing SEM micrographs with specific surface measurements and XRD results. Finally, the room temperature PL spectra show UV emission peak in the range of 378.50-379.80 nm, which is close to the bulk ZnO. © 2012 Elsevier Ltd.


Raoufi D.,Bu - Ali Sina University
Journal of Luminescence | Year: 2013

Zinc oxide (ZnO) precursors were produced via a simple precipitation method from zinc nitrate (Zn(NO3)2) and ammonium carbonate ((NH4)2 CO3) in aqueous solutions. ZnO nanoparticles were synthesized by heating the precursor with different pH of reaction medium at different annealing temperatures. The precursors and synthesized ZnO nanoparticles were characterized by XRD, SEM and TG-DTA measurements. The effect of annealing temperature and pH impact on ZnO products with respect to the morphological and photoluminescence (PL) characteristics has been investigated. It is found that the synthesized ZnO nanoparticles have pure wurtzite structure and the average crystallite size increased with increasing annealing temperature. TG-DTA curves of the ZnO precursor indicate that no thermal effect and no further weight loss were observed above the annealing temperature at 450 °C. SEM micrographs reveal that the particle sizes increase with increasing the annealing temperature. Finally, the room temperature PL spectra confirm that irrespective to the pH of the reaction all PL spectra have only a strong UV emission peak, and with increasing the annealing temperature the visible deep level DL emission intensity increased. © 2012 Elsevier B.V. All rights reserved.


Farahani M.,Bu - Ali Sina University
Engineering Applications of Artificial Intelligence | Year: 2013

In order to enhance transient stability in a power system, a new intelligent controller is proposed to control a Static VAR compensator (SVC) located at center of the transmission line. This controller is an online trained wavelet neural network controller (OTWNNC) with adaptive learning rates derived by the Lyapunov stability. During the online control process, the identification of system is not necessary, because of learning ability of the proposed controller. One of the proposed controller features is robustness to different operating conditions and disturbances. The test power system is a two-area two-machine system power. The simulation results show that the oscillations are satisfactorily damped out by the OTWNNC. © 2012 Elsevier Ltd. All rights reserved.


Farahani M.,Bu - Ali Sina University
IET Generation, Transmission and Distribution | Year: 2012

In this study, a static synchronous series compensator (SSSC) is used to damp the subsynchronous oscillation in a power system compensated by the series capacitor. In order to achieve an effective damping, a supplementary subsynchronous damping controller (SSDC) is added to the SSSC. The only input signal for the SSDC is the rotor speed deviation to generate the modulation index for controlling the injected voltage of the voltage-sourced converter (VSC). Also, the chaotic optimisation algorithm is employed to tune the parameter of SSDC. The design objective is to suppress the subsynchronous resonance (SSR) caused by the series capacitor. By using the SSDC, the SSSC connected at the transmission line is able to damp the SSR. The first system of IEEE second benchmark model is used to evaluate the effective of SSDC on the torsional oscillations. The several simulations are used to demonstrate the ability of SSDC in damping the SSR. © 2012 The Institution of Engineering and Technology.


Moradi M.H.,Bu - Ali Sina University | Abedini M.,Bu - Ali Sina University
International Journal of Electrical Power and Energy Systems | Year: 2012

Distributed generation (DG) sources are becoming more prominent in distribution systems due to the incremental demands for electrical energy. Locations and capacities of DG sources have profoundly impacted on the system losses in a distribution network. In this paper, a novel combined genetic algorithm (GA)/particle swarm optimization (PSO) is presented for optimal location and sizing of DG on distribution systems. The objective is to minimize network power losses, better voltage regulation and improve the voltage stability within the frame-work of system operation and security constraints in radial distribution systems. A detailed performance analysis is carried out on 33 and 69 bus systems to demonstrate the effectiveness of the proposed methodology. © 2011 Elsevier Ltd. All rights reserved.

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