Islamic Azad University at Buinzahra

www.buiniau.ac.ir
Tehran, Iran
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Nasrollahzadeh M.,University of Qom | Mohammad Sajadi S.,Soran University | Rostami-Vartooni A.,University of Qom | Khalaj M.,Islamic Azad University at Buinzahra
Journal of Molecular Catalysis A: Chemical | Year: 2015

This work reports on the green synthesis of Pd/Fe3O4 nanoparticles using Euphorbia condylocarpa M. biebroot extract as reducing agents and stabilizers and their catalytic applications in ligand- and copper-free Sonogashira and Suzuki coupling reactions. This method has such advantages as high yields, simplemethodology and easy work up. In addition, the catalyst can be recovered by using a magnet and reusedseveral times without significant loss of its catalytic activity. The catalyst was characterized using UVvis,powder XRD, SEM and EDS techniques. © 2014 Elsevier B.V. All rights reserved.


Nasrollahzadeh M.,University of Qom | Sajadi S.M.,Kurdistan Regional Government | Khalaj M.,Islamic Azad University at Buinzahra
RSC Advances | Year: 2014

This paper reports on the biosynthesis of copper nanoparticles (NPs) using extract of the Euphorbia esula L leaves as reductant and stabilizer without any surfactant. The catalytic efficiency of the prepared Cu NPs for the reduction of 4-nitrophenol and ligand-free Ullmann-coupling reaction is discussed. The Cu NPs were characterized with UV-vis, XRD and TEM methods. This method has the advantages of high yields, simple methodology, and elimination of ligand and easy work up. This journal is © the Partner Organisations 2014.


Nasrollahzadeh M.,University of Qom | Maham M.,Islamic Azad University | Ehsani A.,University of Qom | Khalaj M.,Islamic Azad University at Buinzahra
RSC Advances | Year: 2014

This paper reports on the synthesis and use of palladium on nano-magnetite as a magnetically separable catalyst for copper- and ligand-free Songashira and Stille coupling reactions. The catalyst was characterized using powder XRD, SEM, EDS and VSM techniques. This method has the advantages of high yields, simple methodology and easy work-up. Catalytic efficiency remains unaltered even after several repeated cycles. © 2014 the Partner Organisations.


Nasrollahzadeh M.,University of Qom | Enayati M.,University of Qom | Khalaj M.,Islamic Azad University at Buinzahra
RSC Advances | Year: 2014

A new method for the synthesis of N-arylureas and their N-arylation with aryl halides has been developed using copper nanoparticles supported on natural Natrolite zeolite as a reusable heterogeneous catalyst under ligand-free conditions. © 2014 the Partner Organisations.


Mirkhani S.A.,Islamic Azad University at Buinzahra | Gharagheizi F.,Islamic Azad University at Buinzahra
Industrial and Engineering Chemistry Research | Year: 2012

In this study attention was focused on the development of a predictive model for the viscosity of ionic liquids. A large data set of 435 experimental viscosity data points for 293 ionic liquids incorporating 146 cations and 36 anions was applied for the model derivation. A quantitative structure-property relationship (QSPR) approach was employed to develop a linear model. In this study the effects of both anions and cations were considered in the derivation of the model. Genetic function approximation is applied for the model's parameter selection (molecular descriptors) and developing a linear QSPR model. Consequently, a simple linear predictive model was obtained with satisfactory results quantified by the following statistical parameters: absolute average deviations (AAD) of the predicted properties from existing experimental values by the GFA linear equation, 8.77%; squared correlation coefficient, 0.8096; and root mean square, 0.232 cP. © 2012 American Chemical Society.


Gharagheizi F.,Islamic Azad University at Buinzahra
Industrial and Engineering Chemistry Research | Year: 2012

In this study, a new simple three-parameter equation is presented for calculation/prediction of the diffusion coefficient of nonelectrolyte organic compounds in water at infinite dilution. The model variables include three molecular-based descriptors. The model is developed using the genetic function approximation (GFA) method. The GFA is applied to select the parameters of the model from more than 3000 molecular-based parameters. To propose a comprehensive and predictive model, 4728 pure chemical compounds are investigated. Furthermore, several statistical methods are implemented to evaluate the predictive power of the model. The root-mean-square of error and the average relative deviation of the model are approximately equal to 3.13 × 10 -6 cm 2•s -1 and 3.6%. © 2012 American Chemical Society.


Mehdipour I.,Islamic Azad University at Buinzahra | Ghazavi M.,K. N. Toosi University of Technology | Moayed R.Z.,Imam Khomeini International University
Geotextiles and Geomembranes | Year: 2013

Geocell reinforced soil may be used in many areas of geotechnical engineering, however, there is little information on analysis of the behavior of geocell reinforced slopes. Due to the height of the geocell, the geocell-reinforced mattress more likely provides a beam or plate effect than a planar membrane effect. The purpose of this paper is to use beam model to simulate the geocell behavior as a flexible slab foundation which can carry both bending and membrane stresses for stability analysis of geocell reinforced slopes. In addition, the interface resistance between the geocell-soil was considered. The Young's modulus of geocell encased soil was obtained from the elastic modulus of the unreinforced soil and the tensile modulus of the geocell reinforcement using an empirical equation. Parametric studies of geocell reinforced slope are carried out by varying placement depth of the geocell layer, number of geocell layers, vertical spacing between reinforcement layers, length, thickness and Young's modulus of the geocell reinforcement. The influence of slope geometry, shear strength properties and soil compaction on the behavior of geocell reinforced slope is also discussed. The obtained results show that geocell reinforcement acts as a wide slab and thus it can restrain the failure surface from developing and redistribute the loads over a wider area. Therefore, under the geocell placement, the lateral deformation and shear strain values of the slope considerably decrease. Furthermore, the effective placement of geocell reinforcements is found to be between the middle of the slope and the middle of critical failure surface of the unreinforced slope. © 2013 Elsevier Ltd.


Task-specific ionic liquid (TSIL) bearing a sulfonic acid group in imidazolium cation (10 mol %), was found to be an effective catalyst for a Strecker-type reaction in water at room temperature. A wide variety of aldehydes/ketones, amines and TMSCN as cyanide source can be easily transformed into the corresponding α-amino nitriles. The water tolerant catalyst could be recycled five times without loss of any activity. © 2012 Académie des sciences.


Gharagheizi F.,Islamic Azad University at Buinzahra
Fluid Phase Equilibria | Year: 2012

In this study, a new eight-parameter equation is presented for calculation/prediction of the normal boiling vaporization enthalpy of pure chemical compounds. The model variables include seven molecular-based descriptors in addition to the normal boiling point temperature. The model is developed using the Genetic-Algorithm-based Multivariate Linear Regression (GA-MLR) method. The GA-MLR is applied to select the parameters of the model from more than 3000 molecular-based parameters in addition to the normal boiling point. To propose a comprehensive and predictive model, 4879 pure chemical compounds are investigated. Furthermore, several statistical methods are implemented to evaluate the predictive power of the model. The root mean square of error and the average absolute deviation of the model are approximately equal to 1.8. kJ/mol and 2.3%. © 2012 Elsevier B.V.


Choobeh A.K.,Islamic Azad University at Buinzahra
Proceedings - 2013 International Conference on Communication Systems and Network Technologies, CSNT 2013 | Year: 2013

Accurate age estimation is one of the most important issues in human communication. It is essential part of humancomputer interaction. In this paper, an averaging technique is proposed which is able to further improve several individual age estimation algorithms. Both mathematical and experimental proofs show, if the individual age estimators are diverse in error, then to improve the results, we can make the ensemble age estimator using the best selected individual age estimators. © 2013 IEEE.

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