Time filter

Source Type

Tehran, Iran

University of Applied Science and Technology is a university administrated by Ministry of Science, Research and Technology with various branches all over the Provinces of Iran.This university helps to increase skill level of employed personnel in various sectors of economic field and graduates of higher education and professional skills that are lacking in administrative. Wikipedia.

Mousavi-Sabet H.,Guilan University | Anvarifar H.,University of Applied Science and Technology of Iran
Folia Zoologica | Year: 2013

A 13-landmark morphometric system was used for 617 specimens to investigate the hypothesis of species differentiation among Cobitis keyvani, Cobitis faridpaki and an unknown Cobitis sp. population from the River Babolrud in the southern Caspian Sea basin. Univariate analysis of variance showed significant differences among the means of the three groups for 41 out of 78 standardized morphometric measurements. In discriminant function analysis, the overall assignment of individuals into their original groups was 58.0 %. The proportions of individuals correctly classified into their original groups were 58.1 %, 64.7 % and 44.1 % for Cobitis sp., C. faridpaki and C. keyvani, respectively. Principal component analysis (PCA) and canonical variates analysis (CVA) confirmed the significant difference among these populations (λ de Wilks = 0.42, P = 0). The CVA scatter plot showed 617 specimens grouped into three distinct areas with some overlap. Clustering based on Euclidean distances among the groups of centroids using an UPGMA indicated segregation of the three populations into two distinct clusters: Cobitis sp. and C. faridpaki in one group and C. keyani in other group. Also the unknown population of spined loach from the River Babolrud was recognized as C. faridpaki and the river as a new habitat for the species.

Choobi M.S.,University of Applied Science and Technology of Iran
Journal of Strain Analysis for Engineering Design | Year: 2013

Welding-induced distortions are one of the major problems frequently encountered in industry. Different geometrical and welding process parameters are believed to influence distortions. One of the most common types of distortions frequently observed in butt-welded plates is angular distortion. In this study, the effect of geometrical parameters on angular distortions in butt-welded plates has been investigated numerically and experimentally. A comprehensive study has been performed, and several cases with different plate lengths, widths and thicknesses have been studied. Distortions have been predicted by three-dimensional thermo-elastic-plastic finite element simulation. The finite element results have been verified by a series of experimental measurements for temperatures and angular distortions. The results of this study revealed that plate thickness, length and width influence the magnitude and mode of distortions greatly. The results revealed that decreasing the plate thickness or increasing the weld length results in higher and nonlinear angular distortions. Increasing the plate width has an adverse effect and reduces the angular distortion. In addition, the thickness of the plate has a key role on distortion behavior and can lead to buckling in thin plates. © IMechE 2013.

Akhgar M.R.,Islamic Azad University at Kerman | Salari M.,Islamic Azad University at Kerman | Zamani H.,University of Applied Science and Technology of Iran
Journal of Solid State Electrochemistry | Year: 2011

The redox response of a modified carbon nanotube paste electrode of ferrocenedicarboxylic acid was investigated. Cyclic voltammetry, differential pulse voltammetry, and chronoamperometry were used to investigate the electrochemical behavior of levodopa (LD) at modified electrode. Under the optimized conditions (pH 5.0), the modified electrode showed high electrocatalytic activity toward LD oxidation; the overpotential for the oxidation of LD was decreased by more than 190 mV, and the corresponding peak current increased significantly. Differential pulse voltammetric peak currents of LD increased linearly with its concentrations at the range of 0.04 to 1,100 μM, and the detection limit (3σ) was determined to be 12 nM. The diffusion coefficient ({D = 9.2 × 10 -6cm 2 and transfer coefficient (α=0.49) of LD were also determined. Mixture of LD, NADH, and tryptophan (TRP) can be separated from one another by differential pulse voltammetry. These conditions are sufficient to allow determination of LD, NADH, and TRP both individually and simultaneously. The modified electrode showed good reproducibility, remarkable long-term stability, and especially good surface renewability by simple mechanical polishing. The results showed that this electrode could be used as an electrochemical sensor for determination of LD, NADH, and TRP in real samples such as urine and water samples. © 2010 Springer-Verlag.

Mohammadzadeh I.,University of Applied Science and Technology of Iran | Sheibani H.,Shahid Bahonar University of Kerman
Chinese Chemical Letters | Year: 2012

In this investigation a new strategy involves the one-pot, three-component reaction of malononitrile, salycilaldehyde and phenol derivatives in the presence of high surface area of MgO is extended to the formation of chromeno[3,4-c]chromene derivatives in good to excellent yields in a short reaction time. Also, the three component reactions of an aldehyde such as salycilaldehyde and ketones with malononitril for the formation of chromeno[3,4-c]pyridines are investigated. © 2012 Iman Mohammadzadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

Torabizadeh M.A.,University of Applied Science and Technology of Iran
Indian Journal of Engineering and Materials Sciences | Year: 2013

Composite materials are subjected to low temperatures in service and this has induced the need for a proper knowledge of low temperature behavior of composites. Most of the research in this field is focused on applying different types of loading and laminated configurations. This paper discusses the experimental study on the tensile, compressive and in-plane shear behavior of unidirectional (UD) glass fiber reinforced polymeric composite under static and low temperature loading conditions. Since UD composite is the basic building block of a composite structure and can be used to make general laminates. In order to fully characterize UD laminate, several experimental tests are performed using an environmental test chamber and a universal testing machine. Thermo-mechanical loads are applied to glass/epoxy unidirectional laminates at room temperature (25°C), -20°C and -60°C. The results of the present study indicate that low temperatures have a significant effect on composite failure mode. It is also found that the strength and modulus of UD composites both increased with decreasing the temperature in all cases including tensile, compressive and shear loads. On the other hand, the results show that strain to failure decreased by decreasing the temperature.

Discover hidden collaborations