Bandar-e Bushehr, Iran

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Hajiraissi R.,Islamic Azad University at Bushehr | Parvinzadeh M.,Islamic Azad University at Tehran
Applied Surface Science | Year: 2011

Influence of nanosilica on surface properties of poly(butylene terephthalate) was investigated by the use of Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), contact angle measurement (CAM), scanning electron microscopy (SEM) and reflectance spectroscopy (RS). FTIR results indicated that surface groups of silica have some interfacial interactions and bonding with carboxyl or hydroxyl end groups of PBT chains. AFM and SEM figures of the resultant nanocomposites illustrated increased surface roughness compared to pure PBT. Optical properties of nanocomposite films were finally determined by the aid of reflectance spectrophotometer. © 2011 Elsevier B.V. All rights reserved.

Sedaghatjoo Z.,Islamic Azad University at Bushehr | Adibi H.,Amirkabir University of Technology
Engineering Analysis with Boundary Elements | Year: 2012

In this paper, a new method is applied to deal with domain integrals of boundary element method (BEM). In fact we focus to convert the domain integrals into boundary integrals for non-homogenous Laplace, Helmholtz and advection diffusion equations in two dimensional BEM. The transformation presented in this paper is based on divergence theorem. In addition, we prove the efficiency of method mathematically when the domain integrals are weakly singular. Numerical results are presented to verify the validity of this method for different geometries. Numerical implementation is done for the constant BEM, which can be implemented easily. To verify the new scheme, some test problems have been designed at end of the paper. The numerical results generally show that the new scheme has good accuracy with regards to other popular schemes. © 2012 Elsevier Ltd. All rights reserved.

Afkhami A.,Bu - Ali Sina University | Soltani-Felehgari F.,Bu - Ali Sina University | Madrakian T.,Bu - Ali Sina University | Ghaedi H.,Islamic Azad University at Bushehr
Biosensors and Bioelectronics | Year: 2014

In this paper, a highly sensitive and selective voltammetric sensor for the determination of nitrite is proposed. We described a fast and easy method for the fabrication of gold nanoparticles/multi-walled carbon nanotube/carbon paste electrode (GNPs /MWCPE) by one-step electrodeposition under controlled potential, the whole procedure takes only several minutes. Scanning electron microscopy (SEM) image demonstrated that the gold nanoparticles deposited on MWCNTs/CPE were uniform, with an average size of 30nm. By combining the benefits of GNPs/MWCNTs and CPE, the resulted modified electrode exhibited outstanding electrocatalytic activity in terms of nitrite oxidation by giving much higher peak currents than those found for the unmodified CPE and also the MWCNTs-modified electrode. The effect of various experimental parameters on the voltammetric response of nitrite was investigated. At the optimum conditions the sensor has a linear response in the 0.05-250.0μmolL-1 concentration range, a very good detection sensitivity (0.4177μALμmol-1), and a low detection limit of 1×10-2μmolL-1 of nitrite. Most common ions and many environmental organic pollutants do not interfere. The proposed chemically modified electrode was used to the determination of NO2 - in several foodstuffs and water samples and the results were found to be consistent with the values obtained by the Griess protocol. © 2013 Elsevier B.V.

Khalili G.,Islamic Azad University at Bushehr
Synthetic Communications | Year: 2013

A synthesis of functionalized N-arylsulfonyl pyrazoles from the multicomponent reaction of arylsulfonyl hydrazones and dialkyl acetylenedicarboxylates in the presence nucleophilic compounds such as pyridine, isoquinoline, or triphenylphosphine, in good yields, is described. © Taylor & Francis Group, LLC.

Stable derivatives of N-alkyl sulfonyl hydrazone were obtained in excellent yields from the reaction between electron-deficient acetylenic ester compounds and sulfonyl hydrazones in the presence of trialkylphosphites in dichloromethan at room temperature. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] © 2013 Copyright Taylor and Francis Group, LLC.

A regioselective method for the synthesis of (E)-3-[2-(arylmethylene)-1- (arylsulfonyl)hydrazino]-2-propenoates is described. The reaction takes place between arylsulfonyl hydrazones and alkyl propiolates in the presence of triphenylphosphine as the catalyst. © 2012 Elsevier Ltd. All rights reserved.

Khalili G.,Islamic Azad University at Bushehr
Molecular Diversity | Year: 2016

Abstract: Sulfenylchloride intermediates generated from the reaction of aryl thiols with N-chlorosuccinimide were trapped by 6-amino uracil derivatives to yield 6-amino-5-(arylthio)-pyrimidine-2,4(1H,3H)-dione compounds at room temperature. Graphical Abstract: [Figure not available: see fulltext.] © 2016 Springer International Publishing Switzerland

This research is aimed at predicting erosion and sedimentation in the Ghareh Aghach Basin in the central part of Iran using Erosion Potential Model (EPM) models incorporated into Geographic Information System (GIS) software. This basin has an area of about 8955 hectares. The region has a range of vegetation, geological, soil texture and land use types. The basin was subdivided into 5 sub-basins. Data required for this study were collected in part through published reports, whilst the remaining was derived by feld surveys. Necessary maps in EPM models were prepared in Autocad-2006 medium and were transported to IILWIS, after some revision. After constructing topologies for all polygons, we entered weightings for all layers within the Arc-View software. Combinations of all layers were managed thereafter. Coeffcient of each factor was determined, and erosion intensity coeffcient (Z) was calculated. Four layers for EPM model were combined to develop the fnal layer of erosion and sedimentation. The results of the EPM model for homogenous and uniform sampling units showed that 0.19% (16.7 ha) of the total watershed area were classifed as class I of erosion category with very low sedimentation and 15.1% (1352 ha) were classifed as class II of erosion category with low sedimentation and 41.3% (3699 ha) were classifed as class III of erosion category with medium sedimentation and 13.2% (1175 ha) were classifed as class IV of erosion category with high sedimentation and fnally 30.2% (2711 ha) were classifed at class V of erosion category with very high sedimentation, respectively. The result of comparing erosion and sediment values using an EPM model with measured values showed that no signifcant difference was observed between the estimated and measured values (P, 0.05). © the author(s), publisher and licensee Libertas Academica Ltd.

Khalili G.,Islamic Azad University at Bushehr
Journal of Sulfur Chemistry | Year: 2013

Protonation of the reactive intermediates produced in the reaction between sodium arylsulfinates and two equiv. of dialkyl acetylenedicarboxylates in DMF, by H2O lead to substituted (1E,3E)-1-(arylsulfonyl)-1,3-butadiene-1,2,3,4- tetracarboxylates in moderate yields. A regioselective method for the synthesis of alkyl (E)-3-(arylsulfonyl)-2-propenoates is described. These reactions provide a useful synthetic route to highly functionalized 1,3-butadienes and 2-propenoates. © 2013 Copyright Taylor and Francis Group, LLC.

Mallaki M.,Islamic Azad University at Bushehr | Fatehi R.,Persian Gulf University
Renewable Energy | Year: 2014

Date palm trees (Phoenix dactylifera L.) produce approximately 40kg of burnable waste including dried leaves, spathes, sheaths, and petioles annually. In this paper, the potential of date palm waste as a bioenergy source has been investigated. As a sample project, a power plant has been preliminary designed to simultaneously generate electrical power using a steam Rankine cycle and distilled water by the thermal desalination of seawater using a multiple effect evaporator. The results indicated that a small plant in Bushehr Province in southern Iran which burns 140,000 tons of waste annually can produce approximately 62GWh of electricity in conjunction with 2.27 million tons of distilled water. This production is equivalent to 75GWhe/year. Environmental assessments revealed that the use of this amount of biomass leads to a net green-house gas (GHG) reduction of 40,500tCO2/year. © 2013 Elsevier Ltd.

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