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Adelkhani H.,Plasma Physics and Nuclear Fusion Research School | Nasoodi S.,Shahid Bahonar University of Kerman | Jafari A.H.,Shahid Bahonar University of Kerman
Progress in Organic Coatings | Year: 2014

In this research, silica films were coated onto aluminum sheets using the sol-gel dip-coating method from acidic and basic solutions containing (C 2H5O)4Si, C2H5OH, H 2O, and catalysts. NH3 and HNO3 were used as catalysts in the acidic and basic solutions, respectively. The characteristics of the films were investigated as a function of the sol catalyst, withdrawal rate, and heat treatment temperature. Morphology of the coatings was studied by scanning electron microscopy (SEM). Corrosion behavior of coated and uncoated aluminum sheets was measured in 0.1 M NaCl. Findings indicated that SiO 2 coatings can offer proper protective properties against corrosive environments. Results also showed that conditions used to prepare the coatings significantly affect the morphology and thus, the corrosion protection of the silica films. © 2013 Elsevier B.V. All rights reserved.

Tabatabaeian S.,K. N. Toosi University of Technology | Mirzaei M.,K. N. Toosi University of Technology | Sadighzadeh A.,Plasma Physics and Nuclear Fusion Research School | Damideh V.,Plasma Physics and Nuclear Fusion Research School | And 2 more authors.
Journal of Applied Fluid Mechanics | Year: 2015

In this paper different configurations of plasma actuator for controlling the flow around a circular cylinder made of Quartz were experimentally investigated. Three thin plasma actuator electrodes were flush-mounted on the surface of the cylinder and were connected to a DC high voltage power supply for generation of electrical discharge. Different configurations of plasma actuator were used for this study and pressure distribution experiments showed that the existence of the plasma decreases the pressure coefficient of the cylinder and the variation of the pressure coefficient can change the behavior of the lift and drag coefficient of the cylinder for all configurations. According to the pressure distribution data, two configurations of the plasma actuators made the best influence on the aerodynamic performance and also on the drag reduction.

Adelkhani H.,Plasma Physics and Nuclear Fusion Research School | Didehban K.,Payame Noor University | Hayasi M.,Material Research School
Current Applied Physics | Year: 2013

In this research, polyacrylamide/Ag composite is synthesized and used as an electrode in an electrochemical capacitor (EC). The characterization of the composite is performed by X-ray diffraction, scanning electron microscopy, and cyclic voltammetry methods. The electrochemical characterization is conducted in an electrolytic solution of KOH and an electrolytic solution of Na 2SO4. The capacitance of the polyacrylamide/Ag composite is associated mainly with the reduction/oxidation of Ag. The specific capacitance of the EC using the KOH electrolyte is 950 Fg-1, which is better than the capacitance in the Na2SO4 electrolyte. This behavior is explained by the respective physical characteristics of the two electrolytes. © 2012 Elsevier B.V. All rights reserved.

Rahimi-Rad A.,Islamic Azad University at Sāveh | Alinejad N.,Plasma Physics and Nuclear Fusion Research School
IEEE Transactions on Plasma Science | Year: 2014

A simulation of discharges in Damavand tokamak is presented using a 0-D model. Time evolution of some parameters of tokamak plasma can be calculated by the 0-D model. The 0-D model is applied to the Damavand tokamak with five differential equations. These equations consist of the density conservation equations of the electron and neutral particles, the power balance equation, and the primary and secondary circuit of the ohmic heating transformer (OHT). From the 0-D model, the time evolution of plasma current, the primary current of the OHT, the time evolution of the electron temperature and electron density, and the neutral particle density can be obtained. The results of the simulation were compared with some of the experimental results obtained in the Damavand tokamak. 0018-9456 © 2014 IEEE.

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