Islamic Azad University at Naragh

www.iau-naragh.ac.ir
Markazi, Iran
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Ahangaran M.R.,University of Tehran | Dehpahlavani M.,Islamic Azad University at Naragh
International Journal of Pediatrics | Year: 2014

Introduction Family is one of the most important grounds of crime and crime victimization development. The experts, welfare workers, lawyers and sociologists argue that the factor or factors should be identified that provide the kind of conditions under which the individuals abuse, tolerate or accept the crime in order to secure the society, reduce the social harms and finally propose the procedures to reform it. The aim of this study was to investigate the crime victimization of children in the city of Qom, Iran. Methods and Materials A questionnaire was distributed and completed through the interviews with the parents live in Gom city and who have a child or children. The analysis of variance (ANOVA) test was used to compare the family structure with the children' tendency towards criminal behaviors. The questionnaires were analyzed by the SPSS software, version 13. The sample size was 266 individuals. Results The findings of research showed that there is a meaningful inverse relationship among the children' control by their families, the rate of children belonging to their families, family cohesion and tendency towards criminal behavior. In other words, as the above mentioned variables increase, the children' tendency towards criminal behaviors decrease and vice versa (P<0.05). Conclusion The comparison of results showed that the children with separated parents were more inclined to criminal behaviors.


Shabanikia A.,Amirkabir University of Technology | Javanbakht M.,Amirkabir University of Technology | Amoli H.S.,Iranian Research Organization for Science and Technology | Hooshyari K.,Amirkabir University of Technology | And 2 more authors.
Electrochimica Acta | Year: 2015

In this work, perovskite-type SrCeO3 nanoparticles were used for improving the properties of high temperature polybenzimodazole (PBI) based proton exchange membranes. Novel proton conducting membrane nanocomposites were prepared using different amounts of SrCeO3 nanopowders dispersed into by solution casting method.The nanocomposite membranes were studied by using AC impedance spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray and thermo gravimetric analysis. The prepared nanocomposite membranes showed a higher acid uptake, proton conductivity and thermal stability compared with the pure PBI membranes. The highest acid uptake (190%) and proton conductivity (0.105 S/cm at 180 °C and 0% RH) were observed for phosphoric acide-dopped PBI nanocomposite membranes containing 8 wt% of SrCeO3 nanoparticles (PSC8). The PSC8 nanocomposite membranes were tested in a fuel cell and the polarization and power curves were obtained at different temperatures. The PSC8 showed 0.44 W/cm2 power density and 0.88 A/ cm2 current density in 0.5 V at 180°C. The result obtained from our studies shows the enhanced potential of the PSC8 as proton exchange membranes for high temperature proton exchange membrane fuel cells. © 2014 Elsevier Ltd. All rights reserved.


Hooshyari K.,Amirkabir University of Technology | Javanbakht M.,Amirkabir University of Technology | Naji L.,Amirkabir University of Technology | Enhessari M.,Amirkabir University of Technology | Enhessari M.,Islamic Azad University at Naragh
Journal of Membrane Science | Year: 2014

In this study, the preparation and characterization of Nafion/Fe2TiO5 nanocomposite membranes for proton exchange membrane fuel cells (PEMFCs) were investigated. Nafion/Fe2TiO5 nanocomposite membranes were prepared by dispersion of Fe2TiO5 nanoparticles within the pure commercial Nafion membranes. The composition percentage of the nanocomposite membranes and the solvent used for the dispersion of nanoparticles within the membranes were varied in order to study the effect of these variations on the proton conductivity, water uptake and also the thermal stability of the membranes. The nanocomposites membranes were characterized by using thermogravimetric analysis (TGA), scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX) spectroscopy and impedance spectroscopy (IS). The prepared Fe2TiO5 nanocomposite membranes showed a higher water uptake, proton conductivity and thermal stability compared with the pure commercial Nafion membranes. The highest proton conductivity (226mS/cm) was observed for the membranes containing 2wt% of Fe2TiO5 nanoparticles and prepared in de-ionized water (DI) as solvent. © 2013 Elsevier B.V.


Hooshyari K.,Amirkabir University of Technology | Javanbakht M.,Amirkabir University of Technology | Shabanikia A.,Amirkabir University of Technology | Enhessari M.,Amirkabir University of Technology | Enhessari M.,Islamic Azad University at Naragh
Journal of Power Sources | Year: 2015

Novel PBI (polybenzimidazole)-BaZrO3 (PBZ) nanocomposite membranes have been prepared for the high temperature proton exchange membrane (HT-PEM) fuel cells. The results showed that the water uptake, acid doping level and proton conductivity of the PBZ nanocomposite membranes were higher than that of virgin PBI membrane due to the presence of perovskite structure BaZrO3 nanoparticles, which as protonic conductor can perform as a special pathway for hydrogen transport. The proton conductivity of the PBZ nanocomposite membranes with 13 mol phosphoric acid per PBI repeat unit was obtained 125 mS/cm at 180 °C and 5% relative humidity. It was found that the performance of the fuel cells increases by increasing temperature; this was explained by faster reaction kinetic and higher proton conductivity. The power density and current density at 0.5 V 180°C with 5% relative humidity were observed 0.56 W/cm2 and 1.12 A/cm2, respectively for PBZ nanocomposite membranes containing 4 wt% of the nanofillers. The results suggested that PBZ nanocomposite membranes are promising electrolytes for HT-PEM fuel cells with improved proton conductivity. © 2014 Elsevier B.V.


Enhessari M.,Islamic Azad University at Naragh | Ozaee K.,Islamic Azad University at Naragh | Karamali E.,Islamic Azad University at Naragh | Ahmadi M.R.,Vienna University of Technology
International Journal of Polymeric Materials and Polymeric Biomaterials | Year: 2012

Polyimides (PIs) are considered to be one of the most important engineering materials. The nano-particle of barium strontium titanate (BST) with formulation of Ba0.77Sr0.23TiO3 was synthesized by the sol-gel method. In this process, different contents of BST suspensions in polyamic acid (PAA) solution were imidized by heat treatment to form PI/BST nanocomposites. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), simultaneous thermal analysis (STA), scanning electron microscope (SEM), and transmission electron microscopy (TEM) were used to characterize the structure and properties of the obtained nanocomposites. It was found that the BST nanoparticles sized 32-40nm were dispersed homogeneously in the polyimide matrix without aggregation. The Χ potential of PI/BST 33 vol.% was decreased in contrast with that of the pure polyimide. The coefficient of thermal expansion (CTE) of PI/BST 33 vol.% was measured between 36°C and 600°C. CTEs comparison showed about 80% decrease in the CTE value of the nanocomposite in respect to the pure polyimide in a wider temperature range. © 2012 Copyright Taylor and Francis Group, LLC.


Salavati-Niasari M.,University of Kashan | Banaiean-Monfared G.,University of Kashan | Emadi H.,University of Tehran | Enhessari M.,Islamic Azad University at Naragh
Comptes Rendus Chimie | Year: 2013

In current study, nanoparticles of NiS were synthesized by applying microwave radiation. The effect of concentration of sulfur source, reaction time, and power of microwave irradiation on the treatment process was investigated. The morphology, structure, and composition of the as-synthesized nanostructures have been confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Optical properties of asprepared sample were investigated by photoluminescence spectroscopy; the emission peak is at 555.04 nm and shows the blue shift. © 2013 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved.


Khansari A.,Guilan University | Enhessari M.,Islamic Azad University at Naragh | Salavati-Niasari M.,University of Kashan
Journal of Cluster Science | Year: 2013

Nickel oxide nanoparticles have been synthesized by thermal treatment of N,N′-(bis(salicylidene)-ethylene-1,2-diamine)Nickel(II); [Ni(salen)]; as precursor which has been synthesized via two methods: [Ni(salen)] were obtained by solid state reaction in absence solvent and co-precipitation reaction in presence of propanol as solvent, respectively. Nickel oxide nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. © 2013 Springer Science+Business Media New York.


Khodabin M.,Islamic Azad University at Karaj | Maleknejad K.,Islamic Azad University at Karaj | Rostami M.,Islamic Azad University at Naragh | Nouri M.,Islamic Azad University at Karaj
Computers and Mathematics with Applications | Year: 2012

In this paper, we obtain stochastic operational matrix of block pulse functions on interval [0,1) to solve stochastic Volterra-Fredholm integral equations. By using block pulse functions and their stochastic operational matrix of integration, the stochastic Volterra-Fredholm integral equation can be reduced to a linear lower triangular system which can be directly solved by forward substitution. We prove that the rate of convergence is O(h). Furthermore, the results show that the approximate solutions have a good degree of accuracy. © 2012 Elsevier Ltd. All rights reserved.


Roghanian E.,K. N. Toosi University of Technology | Foroughi A.,Islamic Azad University at Naragh
International Journal of Industrial Engineering Computations | Year: 2010

Data Envelopment Analysis (DEA) has been one of the most important tools on measuring the relative efficiency of different similar units such as transportation systems using terminals, airports, etc. In this study, we perform an empirical analysis on Iranian airports based on DEA methods to measure the efficiencies of various airports. One of the primary issues on many traditional DEA methods is that the data are almost always contaminated with noise. We use a DEA method which could handle the uncertainty associated with input and output data. The results of this comprehensive study show that most of the active airlines are practically inefficient and the government could significantly increase the efficiencies of the airports by setting new regulations and rules. © 2010 Growing Science Ltd. All rights reserved.


Enhessari M.,Islamic Azad University at Naragh
Pigment and Resin Technology | Year: 2013

Purpose - Inorganic pigments have been widely investigated due to their chemical stability such as resistance to chemical attacks by acids and alkalis, excellent hardness and high temperature stability. Cr1.3Fe 0.7O3 which is considered as a ceramic nanopigment also seems to be a highly efficient photovoltaic material. The paper aims to discuss these issues. Design/methodology/approach - In this work, the paper reports the synthesis of a novel and high purity Cr1.3Fe0.7O 3 nanopigment via sol-gel process using stearic acid as complexing agent. The method includes formation of an organic precursor with metallic cations homogeneously distributed all over the matrix. Sample characterisations were performed by X-ray diffraction, electron microscopy, UV-vis diffused reflectance spectra and photoluminescence. The transport properties and colour characteristics were also investigated by spectroscopic and technological characterisation of the synthesised nanoparticles. Findings - The prepared nanopigments were uniform in distribution and a spherical morphology with an average size of about 200?nm was observed. Cr1.3Fe 0.7O3 nanoparticles showed a direct band gap value of 2.85?eV and the colour efficiency of the nanopigments evaluated by colourimetric analysis resulted characteristic values of L*=39.96, a*=3.67 and b*=3.12. Originality/value - This method for synthesis of nanopigments is novel and could be employed for various applications in synthesis of wide variety of nanoceramics. Copyright © 2013 Emerald Group Publishing Limited. All rights reserved.

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