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Rasht, Iran

Arabani M.,Guilan University
Construction and Building Materials | Year: 2011

The stiffness modulus is one of the most important parameters for the prediction of pavement strength against dynamic loads. Previous research indicated that glass can reduce the construction costs of asphalt concrete pavements while providing better dynamic behaviour because of its unique properties. In this research, the behaviour of Hot Mix Asphalt (HMA) in different temperature conditions depending on the variation of the admixture contents and the gradation of the aggregates will be evaluated. Afterwards, for the first time, models for the prediction of the stiffness modulus of waste glass-asphalt in terms of three different parameters including temperature, percentage of additives and the aggregate gradation will be presented. The results of this research are indicative of an improvement in the dynamic behaviour of glass-asphalt mixture in comparison with conventional HMA mixtures. © 2010 Elsevier Ltd. All rights reserved. Source


3-Methyl-1-sulfonic acid imidazolium hydrogen sulfate has been used as an acidic task-specific ionic liquid for Pechmann condensation reaction. The coumarin products could simply be separated and the ionic liquid could be recycled and reused several times without noticeable decrease in the catalytic activity. © 2012 The Royal Society of Chemistry. Source


A simple and convenient procedure for the synthesis of xanthene derivatives is described through a one-pot condensation of 2-naphthol {2- hydroxynaphthalene-1,4-dione or the mixture of 2-naphthol and 2-hydroxynaphthalene-1,4-dione} with aryl aldehydes in the presence of poly(4-vinylpyridinium)hydrogen sulfate as an efficient, cheap, easily synthesised and eco-friendly catalyst under solvent-free conditions. Further, the catalyst can be reused and recovered several times without any variations in the yield of the product. This journal is © 2012 The Royal Society of Chemistry. Source


A simple and convenient procedure for the synthesis of 14-aryl-14H- dibenzo[a,j]xanthenes is described through a one-pot condensation of 2-naphthol with aryl aldehydes in the presence of poly(4-vinylpyridinium)hydrogen sulfate as an efficient, cheap, readily synthesized and eco-friendly catalyst in a solvent free media using conventional heating and ultrasound irradiation. © 2011 Elsevier B.V. All rights reserved. Source


Karami A.,Guilan University
International Journal of Electrical Power and Energy Systems | Year: 2011

This paper proposes a methodology for estimating a normalized power system transient stability margin (ΔV n) using multi-layered perceptron (MLP) neural network with a fast training approach. The nonlinear mapping relation between the ΔV n and operating conditions of the power system is established using the MLP neural network. The potential energy boundary surface (PEBS) method along with a time-domain simulation technique is used to obtain the training set of the neural network. Results on the New England 10-machine 39-bus system demonstrate that the proposed method provides a fast and accurate tool to evaluate online power system transient stability with acceptable accuracy. In addition, based on the examination of generators rotor angles after faults, a method is presented to select the power system operating conditions that most effect the ΔVn for each fault. © 2011 Elsevier Ltd. All rights reserved. Source

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