Zanjan, Iran
Zanjan, Iran

The University of Zanjan is located in Zanjan, Iran. It was founded in 1975 and organized in 4 Faculties. It is also counted by Iran's census as a settlement in Zanjanrud-e Bala Rural District, in the Central District of Zanjan County, Zanjan Province, Iran. At the 2006 census, its population was 125, in 36 families. Wikipedia.

Time filter

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Noroozian R.,University of Zanjan | Gharehpetian G.B.,Amirkabir University of Technology
International Journal of Electrical Power and Energy Systems | Year: 2013

In this paper, the combined operation of the active power filter with the photovoltaic generation system has been studied. The proposed system consists of a PV power plant, a DC-DC boost converter, and an active power filter. A novel control strategy for the DC-DC converter has been developed in order to extract the maximum amount of power from PV arrays. Also, a novel control strategy, which is based on generalized instantaneous reactive power theory, has been proposed for the active power filter. The simulation results, based on PSCAD/EMTDC, show that the proposed system can provide the power factor correction, load balancing, harmonic elimination, reactive power compensation and simultaneously inject the maximum power available from the PV array into the grid. © 2012 Elsevier Ltd. All rights reserved.

This paper presents a new recursive terminal sliding mode strategy for tracking control of disturbed chained-form nonholonomic systems whose reference targets are allowed to converge to zero in finite time with an exponential rate. By introducing time-varying coordinate transformation and designing a novel control law, the existence of the sliding mode around the terminal sliding surface is guaranteed. Simulation results are applied on two benchmark examples of chained-form nonholonomic systems: a wheeled mobile robot and an underactuated rigid body. The simulation results show the efficiency of the proposed method in the presence of external disturbances. © 2015, Springer Science+Business Media Dordrecht.

This paper addresses a novel global nonlinear sliding surface to achieve robustness and high performance for a class of uncertain nonlinear systems. Using the Lyapunov stability theorem, exponential stability analysis of the system states is proposed in the linear matrix inequality form. A new control law is designed to guarantee the elimination of the reaching phase and the existence of the sliding mode around the nonlinear surface right from the beginning. Two illustrative simulations are presented to demonstrate the robustness and effectiveness of the introduced design. It is worthwhile noticing that the proposed approach can be applied to a wide variety of uncertain nonlinear control problems. © 2014, Springer Science+Business Media Dordrecht.

This paper presents an approach of achieving high performance and robustness for matched uncertain multi-input multi-output linear systems with external disturbances and multiple state-delays, which are often encountered in practice and are frequently the sources of instability. This scheme is based on composite nonlinear feedback and integral sliding mode control methods. The selection of nonlinear function and the existence of sliding mode are two important issues, which have been addressed. The control law is designed to guarantee the existence of the sliding mode around the nonlinear surface, and the damping ratio of the closed-loop system is increased as the output approaches the set-point. Simulation results are presented to show the effectiveness of the proposed method as a promising way for controlling similar nonlinear systems. © 2014 Springer Science+Business Media Dordrecht.

Rahmani O.,University of Zanjan | Pedram O.,University of Zanjan
International Journal of Engineering Science | Year: 2014

In this study Timoshenko beam theory that applies the size dependent effects in functionally graded material (FGM) beam is discussed. The material properties of FG nanobeams are considered to vary over the thickness based to the power law. The equations of motion according to Eringen nonlocal theory, using Hamilton's principle are derived and a closed-form solution is presented for vibration behavior of the proposed model. The nonlocal elasticity theory contains a material length scale parameter that can apply the size effect in a FG material. The model is verified by comparing the obtained results with benchmark results available in the literature. In following a parametric study is accompanied to examine the effects of the gradient index, length scale parameter and length-to-thickness ratio on the vibration of FGM nanobeams. It is observed that these parameters are vital in investigation of the free vibration of a FG nanobeam. © 2013 Elsevier Ltd. All rights reserved.

In this paper, the composite nonlinear feedback (CNF) method for robust tracking control of multivariable time-delayed systems with input saturation is proposed. By constructing an appropriate Lyapunov-Krasovskii functional and using the linear matrix inequality (LMI) technique, the asymptotic tracking criteria is derived in terms of LMI, which can be solved numerically using the LMI® toolbox of MATLAB. Unlike the previous robust tracking controller design methods, which need restrictive assumptions, less conservative design conditions are obtained using this approach. The proposed CNF-based robust tracking controller improves the transient performance and steady state accuracy simultaneously. Simulation results are included to demonstrate the effectiveness of the proposed method. © 2013 Springer Science+Business Media Dordrecht.

Rahmani O.,University of Zanjan
Acta Physica Polonica A | Year: 2014

In this study, a model based on a nonlocal theory is proposed to study the effect of external loads on the free vibration of nanobeams. The governing equations for the initially pre-stressed beam are obtained by using the Hamilton principle. Analytical solution of vibration is presented using the Eringen nonlocal theory to bring out the effect of the nonlocal behavior on natural frequencies. The performance of the present model is compared with that of others by the presentation of comparative results. It is suggested that the present model can be used as a benchmark in future studies.

Bigdeli M.,University of Zanjan
Physical Review C - Nuclear Physics | Year: 2012

In the present work we study asymmetric nuclear matter in the presence of strong external magnetic fields using the lowest-order constrained variational (LOCV) method with the AV 18 potential and employing a microscopic point of view. According to our results, the induced phase transition to antiferromagnetic states occurs for asymmetric nuclear matter in a strong magnetic field. © 2012 American Physical Society.

The simplification conditions for lattice representation of the PWA control law in the explicit MPC suggested in the aforementioned article are shown, by means of a counterexample, not to be sufficient. In view of this, a modified lemma is proposed in this note for ensuring the sufficiency. © 2012 Elsevier Ltd. All rights reserved.

(Figure presented) A novel and efficient method has been developed for the synthesis of 2,5-disubstituted 1,3,4-oxadiazole derivatives using (N-isocyanimino)triphenylphosphorane, a secondary amine, a carboxylic acid, and an aromatic aldehyde in CH2Cl2 at ambient temperature in high yields without using any catalyst or activation. The procedure provides an alternative method to the synthesis of fully substituted 1,3,4-oxadiazole derivatives. © 2010 American Chemical Society.

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