Time filter

Source Type

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.

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.

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.

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.

Asiaei M.,Islamic Azad University at Karaj | Solati J.,Islamic Azad University at Karaj | Salari A.-A.,Islamic Azad University at North Tehran
Developmental Psychobiology | Year: 2011

Growing evidence suggests that early life events are critical determinants for disorders later in life. According to a comprehensive number of epidemiological/animal studies, exposure to lipopolysaccharide, causes alteration in pro-inflammatory cytokine levels, hypothalamic-pituitary-adrenal functioning and the hormonal system which may contribute to behavioral and neurological injuries. In this study we investigated the effects of lipopolysaccharide administration on physiological parameters in pregnant dams and their male offspring aged 9 weeks. In gestational Day 10, pregnant mice were injected intrapritoneally with Salmonella enterica lipopolysaccharide to model prenatal exposure to infection. The following results were obtained for offspring from dams stressed during pregnancy: (a) reduced anxiety-related behavior in the elevated plus maze; (b) reduced food and water intake; (c) reduced body weight from birth up to postnatal Day 40. The observed data provide experimental evidence showing that prenatal stress can have complex and long-lasting physiological/behavioral consequences in offspring. © 2011 Wiley Periodicals, Inc.

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.

Discover hidden collaborations