Amirkabir University of Technology , formerly called the Tehran Polytechnic, is a public research university located in Tehran, Iran. AUT is one of the most prestigious universities, and the first established technical university in Iran, referred to as "Mother of Industrial Universities".The university was first founded by Habib Nafisi in 1958 and then developed by Dr. Mohammad Ali Mojtahedi, during the reign of the Pahlavi dynasty. Originally named the Tehran Polytechnic, it began its activities with five engineering departments. Six months before the victory of 1979 Iranian Revolution, Tehran Polytechnic was renamed after the famed Iranian prime minister Amir Kabir . With its expansion, the university now boasts fifteen science and engineering departments, and two other affiliated centers, located in Bandar Abbas and Mahshahr. There are currently around 9,100 students enrolled in the undergraduate and graduate programs. AUT has 480 full-time academic faculty members and 550 administrative employees. This gives AUT the highest staff-to-student ratio among the country's universities. The executive branch consists of four departments which receive active participation from various councils in planning and administering affairs.AUT has signed mutual agreements with international universities for research and educational collaboration. There is a joint program between AUT and the University of Birmingham.AUT is one of the leading universities in E-Learning systems in Iran which has begun its activities in 2004.Amirkabir University is the pioneer of sustainable development in Iran and established the AUT's Office of Sustainability on July 2011. The activities of the Office of Sustainability contribute to AUT's campus by reducing energy consumption, costs, and emissions, and also student coursework, volunteer opportunities for students, as well as research and education academic activities on sustainable development. Wikipedia.
Ahmadlou M.,Amirkabir University of Technology |
Adeli H.,Ohio State University
NeuroImage | Year: 2011
Analysis of structure of the brain functional connectivity (SBFC) is a fundamental issue for understanding of the brain cognition as well as the pathology of brain disorders. Analysis of communities among sub-parts of a system is increasingly used for social, ecological, and other networks. This paper presents a new methodology for investigation of the SBFC and understanding of the brain based on graph theory and community pattern analysis of functional connectivity graph of the brain obtained from encephalograms (EEGs). The methodology consists of three main parts: fuzzy synchronization likelihood (FSL), community partitioning, and decisions based on partitions. As an example application, the methodology is applied to analysis of brain of patients with attention deficit/hyperactivity disorder (ADHD) and the problem of discrimination of ADHD EEGs from healthy (non-ADHD) EEGs. © 2011.
Montazer M.,Amirkabir University of Technology |
Pakdel E.,Islamic Azad University at Tehran
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2011
The consumption of titanium dioxide in today's world is on the increase. As the most popular nano substance, TiO 2 is used in various industries notably in the textile industry. More and more recently, through a synergistic combination of photocatalytic features of nanoparticles, fabrics with novel properties are produced. Self-cleaning and stability against UV rays as well as chemical media, to name but a few, are among new prominent properties, obtained on textiles. A common subject reported in most studies has been the diverse approaches to immobilize the nanoparticles on the surface of fabrics. Wool is among common textile materials that have undergone numerous processes to be modified. This review intends to bring to light different aspects of application of nano titanium dioxide in the textile industry especially on wool, and also presents a concise overview on the rigorous pieces of research conducted in this realm. © 2011 Elsevier B.V.
Amirkabir University of Technology and National Science Foundation | Date: 2015-05-26
The embodiments herein provide a self-excited contact less Hybrid Electromagnetic Braking (HEB) system provided with a both Permanent Magnetic (PM) type ECB and electrically excited windings type ECB. The HEB system has an Eddy Current Brake (ECB) and a Regenerative Brake (RB) with two outer rotors and a common internal stator. The rotor assembly of the RB is coupled to the same shaft on which the ECB rotor is mounted. The RB collects an input mechanical power from the shaft to supply electrical power to ECB windings through a power electronic interface module. A controller measures the system conditions to send a control signal to the power electronic interface module to control a power flow from RB to ECB. The ECB and RB develops two braking torques on the shaft to initiate a braking action in the vehicle.
Zare Y.,Amirkabir University of Technology
Waste Management | Year: 2013
Currently, the growing consumption of polymer products creates the large quantities of waste materials resulting in public concern in the environment and people life. Nanotechnology is assumed the important technology in the current century. Recently, many researchers have tried to develop this new science for polymer recycling. In this article, the application of different nanofillers in the recycled polymers such as PET, PP, HDPE, PVC, etc. and the attributed composites and blends is studied. The morphological, mechanical, rheological and thermal properties of prepared nanocomposites as well as the future challenges are extensively discussed. The present article determines the current status of nanotechnology in the polymer recycling which guide the future studies in this attractive field. © 2012 Elsevier Ltd.
Kowsari E.,Amirkabir University of Technology
Journal of Nanoparticle Research | Year: 2011
Nanosheet-based microspheres of ZnO with hierarchical structures, hollow prism, and coralline-like ZnO nanostructures were successfully prepared by ultrasonic irradiation in acidic ionic liquids (AILs). The hollow spherical is made up of many thin petals, the thickness of which is only about 90 nm. In the presence of AIL2, the one prepared at a frequency of 40 kHz is a mixture of nanofibers with diameters ranging from less than 30 nm to about 100 nm. ZnO nanostructure (with AIL1) reveals lozenge-shape hollow prism structures. The products were hollow prism structure covered with some nanometric-size nanoparticles. The average size of the nanoparticles is in the range of 40-80 nm. It is found that the ultrasonic irradiation time, ultrasonic frequency, and the AILs influence the growth mechanism and optical properties of ZnO nanostructures. Producing Zno nanostructures by different traditional methods (e.g., hydrothermal method) requires basic media. These methods are not economical and environmentally friendly in many industrial processes. In so doing, a critical problem has been the point that, normally, a high concentration of base causes reactor metal corrosion. This is a simple and low-cost method, which can be expected to be applied in industry in the future. Also, importantly, the structures synthesized in this experiment can indicate a new way to construct nanodevices by self-organization in one step. © 2011 Springer Science+Business Media B.V.
Rahbar-Ranji A.,Amirkabir University of Technology
Ocean Engineering | Year: 2012
Corrosion is one of the time dependent detrimental phenomena which reduces strength of structures and leads to catastrophic failures. All rules and regulations concerning strength of corroded plates are based on uniform thickness reduction. To estimate residual strength of corroded structures, typically a much higher level of accuracy is required, since, the actual corroded plate has irregular surfaces. There is little study on strength analysis of corroded plate with irregular surfaces especially as a function of corrosion parameters. It is the main aim of present work to study ultimate strength of corroded steel plates with irregular surfaces under in-plane compression. Nonlinear finite element method is employed to determine ultimate strength of corroded steel plates with irregular surfaces. Comparing the results with ultimate strength of corroded plates with uniform thickness, a reduction factor is introduced. Having done this, ultimate strength of corroded plates could be evaluated easily as a function of corrosion conditions. © 2012 Elsevier Ltd.
Taleei A.,Amirkabir University of Technology |
Dehghan M.,Amirkabir University of Technology
Computer Methods in Applied Mechanics and Engineering | Year: 2014
In recent years, there have been extensive efforts to find the numerical methods for solving problems with interface. The main idea of this work is to introduce an efficient truly meshless method based on the weak form for interface problems. The proposed method combines the direct meshless local Petrov-Galerkin method with the visibility criterion technique to solve the interface problems. It is well-known in the classical meshless local Petrov-Galerkin method, the numerical integration of local weak form based on the moving least squares shape function is computationally expensive. The direct meshless local Petrov-Galerkin method is a newly developed modification of the meshless local Petrov-Galerkin method that any linear functional of moving least squares approximation will be only done on its basis functions. It is done by using a generalized moving least squares approximation, when approximating a test functional in terms of nodes without employing shape functions. The direct meshless local Petrov-Galerkin method can be a very attractive scheme for computer modeling and simulation of problems in engineering and sciences, as it significantly uses less computational time in comparison with the classical meshless local Petrov-Galerkin method. To create the appropriate generalized moving least squares approximation in the vicinity of an interface, we choose the visibility criterion technique that modifies the support of the weight (or kernel) function. This technique, by truncating the support of the weight function, ignores the nodes on the other side of the interface and leads to a simple and efficient computational procedure for the solution of closed interface problems. In the proposed method, the essential boundary conditions and the jump conditions are directly imposed by substituting the corresponding terms in the system of equations. Also, the Heaviside step function is applied as the test function in the weak form on the local subdomains. Some numerical tests are given including weak and strong discontinuities in the Poisson interface problem. To demonstrate the application of these problems, linearized Poisson-Boltzmann and linear elasticity problems with two phases are studied. The proposed method is compared with analytical solution and the meshless local Petrov-Galerkin method on several test problems taken from the literature. The numerical results confirm the effectiveness of the proposed method for the interface problems and also provide significant savings in computational time rather than the classical meshless local Petrov-Galerkin method. © 2014 Elsevier B.V.
Zare Y.,Amirkabir University of Technology |
Garmabi H.,Amirkabir University of Technology
Polymer Reviews | Year: 2014
The development of simulation techniques is more crucial to establish the structure-processing-properties relationship for design and optimization of advanced nanocomposites. In this work, the attempts made for the simulation of modulus in polymer/carbon nanotube (CNT) reinforced nanocomposites and the future challenges are discussed. The simulating techniques including micromechanics and multiscale models are extensively analyzed. It is concluded that the multiscale and other new techniques should be developed to cover the wide range of time and length scales, from quantum structure (a few atoms) to macroscopic structure (many domains), to introduce a useful tool for the simulation of modulus. A comprehensive modeling of modulus requires much knowledge in many fields such as polymer, mechanics, and mathematics. © Taylor & Francis Group, LLC.
Zare Y.,Amirkabir University of Technology
International Journal of Adhesion and Adhesives | Year: 2014
In this paper, various micromechanics models are applied to evaluate the interfacial characteristics between the matrix and the nanofiller phases in shape memory polymer nanocomposites (SMPNs). The models analyze the interfacial adhesion by yield strength and tensile modulus of several SMPNs from literature. In addition, the effect of interfacial adhesion on the shape memory behavior of SMPNs is discussed. All calculated parameters by modeling process demonstrate an acceptable interfacial bonding in the reported SMPNs. It is confirmed that the SMPNs, which show a good shape memory behavior, include a strong adhesion at the polymer-nanofiller interface. © 2014 Elsevier Ltd.
Moghassemi S.,Amirkabir University of Technology |
Hadjizadeh A.,Amirkabir University of Technology
Journal of Controlled Release | Year: 2014
The field of nanochemistry research has shown a great progress in the developing of novel nanocarriers as potential drug delivery systems. Niosome is a class of molecular cluster formed by self-association of non-ionic surfactants in an aqueous phase. The unique structure of niosome presents an effective novel drug delivery system (NDDS) with ability of loading both hydrophilic and lipophilic drugs. Numerous research articles have been published in scientific journals, reporting valuable results of individual case studies in this context. However, surveying and discussing the recent, rapidly growing reported studies along with their theoretical principals is required for the fully understanding and exploring the great potential of this approach. To this aim, we have provided an illustrated and comprehensive study from the view of a supramolecular chemist, interested in the synthesizing and studying chemical aggregates on the nanoscale for the development of nanotechnological clusters including niosomes. First, a connectional review of the molecular structure and physicochemical properties of niosome forming non-ionic surfactants and additive agents have been discussed. Second, a systematic survey of niosome preparation and loading methods, administration routes, characterization of niosomes, their toxicity studies and mechanism of drug release; used in recent articles have been performed. © 2014 Elsevier B.V.