Islamic Azad University at North Tehran
Tehran, Iran

Islamic Azad University North Tehran Branch is part of Islamic Azad University. It was founded in 1985 and currently has an enrollment of 18,000 students. The university offers bachelors degrees, masters degrees and Ph.D degrees in 8 Colleges. It is located in Hakimiyeh-Tehran Pars, Tehran. The university, with the score of 2132, is ranked among "Top 5" universities. The educational area of the university is 35 thousand square meters which provides 10 square meters of educational, welfare and sport for student. Wikipedia.

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Tanzadeh J.,Islamic Azad University at Bandar Anzali | Shahrezagamasaei R.,Islamic Azad University at North Tehran
Construction and Building Materials | Year: 2017

Porous Friction Course (PFC) is a hot mix asphalt with coarse-grained and the gap graded aggregate. In porous asphalt, high volume percentage of empty space has a number of advantages, including the creation of proper drainage on the road. On the other hand, the empty space decreases the resistance of the mixtures against rutting compared to mixtures with the dense aggregation. In this study, with the modification of asphalt binder by 4.5 percent of styrene butadiene styrene (SBS) and the amount of 2 and 4 percent of Nano silica and also by adding 0.5 and 1 percent of lime powder and as well as hybrid synthetic fiber to 0.4 and 0.5 percent by weight of asphalt mixtures as filler types, to improve the performance properties of modified porous asphalt mixtures, leading to a reduction in weight loss of asphalt binder and also increase the tensile strength and resistance to rutting. A combination of 0.1 and 0.2 percent of glass fibers with a 0.3 percent of polypropylene fibers, is defined as a type of hybrid fiber. In addition, the least amount of rutting failure occurs in the reinforced porous asphalt, using a combination of 0.2 percent glass fiber and 0.3 percent polypropylene. Also the most appropriate consuming asphalt binder in order to reduce drain down is also equal to 4.5 percent, that for the amount of 4 percent Nano silica in it. Moreover, by adding lime powder content used on the specimens from 0.5 percent to 1 percent, the tensile strength value could be increased about 16.5 percent for reinforced porous asphalt containing 4.5 percent asphalt binder. © 2017 Elsevier Ltd

Fereidooni L.,Islamic Azad University at North Tehran | Mehrpooya M.,University of Tehran
Energy Conversion and Management | Year: 2017

Used waste cooking oil (WCO) or frying oils are being considered as rich sources of economical feedstock for biodiesel production. To carry out the process of trans-esterification of WCO to methyl esters (biodiesel), zeolite/chitosan/KOH composite was used as solid heterogeneous catalysts. The composite was analyzed using Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscope coupled with Energy Dispersive X-ray (SEM-EDX) analysis, and X-ray diffraction (XRD) analysis. It was found that the treatment of the natural zeolite (clinoptilolite zeolite) with KOH significantly decreased its silica content by desilication and increased its K+ content by formation of hydroxylpotaslite. Electrolysis method (EM) is used as an applicable technology for recovery of energy and resources during waste treatment. Theoretically, EM can convert any biodegradable waste into H2, O2, biofuels, as well as other by-products such as glycerol. However, the system efficacy can vary significantly under different circumstances. The conversion of biodiesel from WCO was obtained for 1 wt.% catalyst concentration and alcohol/oil ratio of 1:7 at 40 V in the presence of water as 2 wt.% of the whole solution in 3 h, produced 93% yield. The optimum conversion process was achieved as a result of using co-solvent as acetone. Fourier Transform Infrared (FT-IR) and Viscosity characterization were used the assessing techniques for detection of WCO and biodiesel. © 2017 Elsevier Ltd

Rad M.A.,Islamic Azad University at North Tehran | Khoshalhan F.,K. N. Toosi University of Technology | Glock C.H.,TU Darmstadt
Computers and Industrial Engineering | Year: 2014

This paper develops a model of an integrated vendor-buyer supply chain with imperfect production and shortages. We assume that market demand is sensitive to the buyer's selling price and thus study combined operations and pricing decisions in the supply chain. We first derive the expected profit per unit of time using the well-known renewal-reward theorem, and then maximize profit for the cases of independent and joint optimization. Numerical examples and a sensitivity analysis are provided to illustrate the proposed models. The results indicate that coordination and backordering improve the total expected profit of the system, and that both measures become more important for the supply chain as the price sensitivity of demand increases. Furthermore, the coordinated supply chain often prefers to perform inspection at the vendor, who is more familiar with the product and its deficiencies than the buyer in many cases. © 2014 Elsevier Ltd. All rights reserved.

Sohrabi M.R.,Islamic Azad University at North Tehran | Matbouie Z.,Islamic Azad University at Darab | Asgharinezhad A.A.,Shahid Beheshti University | Dehghani A.,Iran University of Science and Technology
Microchimica Acta | Year: 2013

We describe a novel magnetic metal-organic framework (MOF) for the preconcentration of Cd(II) and Pb(II) ions. The MOF was prepared from the Fe3O4-pyridine conjugate and the copper(II) complex of trimesic acid. The MOF was characterized by IR spectroscopy, elemental analysis, SEM and XRD. A Box-Behnken design through response surface methodology and experimental design was used to identify the optimal parameters for preconcentration. Extraction time, amount of magnetic MOF and pH value were found to be critical factors for uptake, while type, volume, concentration of eluent, and elution time are critical in the elution step. The ions were then determined by FAAS. The limits of detection are 0.2 and 1.1 μg L-1 for Cd(II), and Pb(II) ions, respectively, relative standard deviations are <4.5% (for five replicates at 50 μg L-1 of Cd(II) and Pb(II) ions), and the enrichment capacity of the MOF is at around 190 mg g-1 for both ions which is higher than the conventional Fe3O4-pyridine material. The magnetic MOF was successfully applied to the rapid extraction of trace quantities of Cd(II) and Pb(II) ions in fish, sediment, and water samples. © 2013 Springer-Verlag Wien.

Sohrabi M.R.,Islamic Azad University at North Tehran | Ghavami M.,Islamic Azad University at North Tehran
Desalination | Year: 2010

The degradation of diazo Direct Yellow 12 dye (Chrysophenine G) was studied by using photocatalytic oxidation (UV/semiconductor). The influence of various parameters, including the type of catalyst, the presence of H2O2, initial pH of the solution and the catalyst loading on the degradation process were investigated. The photocatalysts were TiO2, ZnO, Fe2O3 and SnO2. In addition, the effects of several cations (Cu2+, Al3+, Cr3+, and Sn4+) and anions (BiO3-, SO4 2-, and CN-) were examined in UV/TiO2 system. The results obtained showed that acidic pH is proper for the photocatalytic removal of Direct Yellow 12. In optimum pH, the degradation of dye was completely performed in UV/TiO2 system but other catalysts did not show any significant photodegradation of the dye. However, the addition of H2O2 to the heterogeneous system activated these catalysts. After 90 min of reaction, the order of photocatalytic activity of various photocatalysts was: UV/H2O2/TiO2 > UV/H2O2/Fe2O3 > UV/H2O2/ZnO > UV/H2O2/SnO2. © 2009 Elsevier B.V. All rights reserved.

Hasheminejad M.,Agricultural Biotechnology Research Institute of Iran | Tabatabaei M.,Agricultural Biotechnology Research Institute of Iran | Mansourpanah Y.,Lorestan University | far M.K.,Iran Renewable Energy Organization SUNA | Javani A.,Islamic Azad University at North Tehran
Bioresource Technology | Year: 2011

In recent years biodiesel has drawn considerable amount of attention as a clean and renewable fuel. Biodiesel is produced from renewable sources such as vegetable oils and animal fat mainly through catalytic or non-catalytic transesterification method as well as supercritical method. However, as a consequence of disadvantages of these methods, the production cost increases dramatically. This article summarizes different biodiesel production methods with a focus on their advantages and disadvantages. The downstream and upstream strategies such as using waste cooking oils, application of non-edible plant oils, plant genetic engineering, using membrane separation technology for biodiesel production, separation and purification, application of crude glycerin as an energy supplement for ruminants, glycerin ultra-purification and their consequent roles in economizing the production process are fully discussed in this article. © 2010 Elsevier Ltd.

Sohrabi M.R.,Islamic Azad University at North Tehran
Microchimica Acta | Year: 2014

A novel type of porous metal-organic framework (MOF) was obtained from thiol-modified silica nanoparticles and the copper(II) complex of trimesic acid. It is shown that this nanocomposite is well suitable for the preconcentration of Hg(II) ions. The nanocomposite was characterized by Fourier transfer infrared spectroscopy, X-ray powder diffraction, energy-dispersive X-ray diffraction and scanning electron microscopy. The effects of pH value, sorption time, elution time, the volume and concentration of eluent were investigated. Equilibrium isotherms were studied, and four models were applied to analyze the equilibrium adsorption data. The results revealed that the adsorption process obeyed the Langmuir model. The maximum monolayer capacity and the Langmuir constant are 210 mg g-1 and 0.273 L mg-1, respectively. The new MOF-based nanocomposite is shown to be an efficient and selective sorbent for Hg(II). Under the optimal conditions, the limit of detection is 20 pg mL-1 of Hg(II), and the relative standard deviation is <7.2 % (for n = 3). The sorbent was successfully applied to the rapid extraction of Hg(II) ions from fish, sediment, and water samples. [Figure not available: see fulltext.] © 2013 Springer-Verlag Wien.

Pirkarami A.,Islamic Azad University at North Tehran | Olya M.E.,Iran Institute for Color Science and Technology | Yousefi Limaee N.,Iran Institute for Color Science and Technology
Progress in Organic Coatings | Year: 2013

This study is a report on the photo electro adsorption (PEA) decolorization of a mixture of three azo dyes, i.e., Acid Red 88 (AR88), Acid Blue 92 (AB92), and Acid Orange 2 (AO2) with polyaniline-modified electrode as a conductive polymer. Aniline was electropolymerized on steel electrode by being immersed in a solution containing HClO4 as the supporting electrolyte and NaClO4 as the dopant. This modified electrode was then used in a non-continuous reactor using UV irradiation for the decolorization of azo dyes. To obtain the best conditions for high decolorization efficiency, experiments were carried out at different operational conditions, including initial dye concentration, pH, and bias potential. The morphology of polyaniline film was analyzed by scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectrum was obtained to characterize polyaniline and dyes. Energy consumption was calculated to be 3.6 kWh/m3 after 36 min of treatment process. Maximum removal of 96% was achieved for the mixture of AR88, AB92, and AO2 in aqueous solution at pH 5, initial dye concentration of 30 mg L -1, and bias potential of 1.3 V after 40 min of PEA process. The results indicate that the PEA process could be effectively applied to the removal of industrial effluents. © 2013 Elsevier B.V. All rights reserved.

Meratizaman M.,K. N. Toosi University of Technology | Monadizadeh S.,Islamic Azad University at North Tehran | Amidpour M.,K. N. Toosi University of Technology
Desalination | Year: 2014

One of the most favorable thermal desalination methods used widely today is Multiple Effects Distillation (MED). Thermal nature of MED process causes the integration of a desalination unit with a high temperature power cycle like gas turbine. The improvement in energy efficiency is obtained as a result of this combination. One of the high temperature power cycles which has cogeneration opportunities is Solid Oxide Fuel Cell-Gas Turbine (SOFC-GT). Integration of MED with SOFC-GT power cycle in 300-1000. kW (size of SOFC) is considered in this article. The exhausted heat of SOFC-GT power cycle is used in Heat Recovery Steam Generator (HRSG) to produce a required motive steam for the desalination unit. Simulation, parametric studies and an economic analysis of the small scale MED unit in combination with SOFC-GT power cycle are carried out to investigate the system performance. Economic analyses are applied based on the Annualized Cost of System method. Results show that the combination of MED with the SOFC-GT power cycle makes the system more economic. It shows that in greater gas prices (more than 0.07 US$ per normal cubic meter), the increment in the number of effect has a remarkable influence to decrease the period of return. © 2014 Elsevier B.V.

Khazaeli S.,Southern Illinois University at Edwardsville | Nezamabadi N.,Southern Illinois University at Edwardsville | Rabani M.,Islamic Azad University at North Tehran | Panahi H.A.,Islamic Azad University at Central Tehran
Microchemical Journal | Year: 2013

In this work, Amberlite XAD-4 functionalized with salicylic acid through an azo linkage (NN) was synthesized and used as a new chelating resin for preconcentration of Pb(II), Cu(II), Ni(II), Co(II), and Zn(II) in water samples. The resin was characterized by scanning electron microscopy, elemental analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Determination of the metal ions was carried out by flame atomic absorption spectrophotometry. Metal ion sorption equilibria were reached within 30min. The preconcentraion factor was 50 for a 500mL sample. The sorbed metal ions were eluted by 10mL of 0.5M HNO 3 within 10min with the desorption recovery of ≥90%. This new method gave a good accuracy in batch system as indicated by the recovery of ≥93% for the extraction of all metal ions and R.S.D. less than 1.4% (n=5). The detection limits for Pb(II), Cu(II), Ni(II), Co(II) and Zn(II) were 0.15, 0.18, 0.18, 0.21, and 0.19μgL -1, respectively. © 2012 Elsevier B.V.

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