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Siadatan A.,Islamic Azad University at West Tehran | Kazemi Karegar H.,Shahid Beheshti University | Najmi V.,Shahid Beheshti University
PECon2010 - 2010 IEEE International Conference on Power and Energy | Year: 2010

The high impedance fault detection in power system is one of the hard works and if the fault does not clear then the power system may get into damage. In this paper a new method for high impedance fault detection is proposed. The proposed method is based on the chaotic and doffing function. The paper will propose the appropriate formula and the setting parameters. The method is applied on a sample distribution network and the simulation results show that the new method properly works. ©2010 IEEE. Source

Siadatan A.,Islamic Azad University at West Tehran | Najmi V.,Shahid Beheshti University | Afjei E.,Shahid Beheshti University
International Review on Modelling and Simulations | Year: 2011

In this paper, a modeling and simulation analysis of two layers 6/4 three phase Switched Reluctance (SR) Machine is carried out. This machine consists of two magnetically dependent stator and rotor layers, where each stator layer includes six salient poles with windings wrapped around them, while the rotor comprises of four salient poles with different arc lengths and no windings. There is a stationary reel, which has the field coils wrapped around it and is placed between the two-stator sets. The distinctive point of this machine is its ability to work in motor and generator modes, which leads to hybrid operation. The mathematical model is carried out to obtain the characteristics of this machine (motor and generator). The torque ripple reduction is done as well by a novel introduced method using Rotor Shifting Method (RST). Furthermore, machine operations as SR motor and generator is simulated by 3D Finite Element Method (FEM). Finally, the mathematical model and simulation results are compared. © 2011 Praise Worthy Prize S.r.l. - All rights reserved. Source

Babaei P.,Islamic Azad University at West Tehran
Proceedings of the 2010 International Conference on Signal and Image Processing, ICSIP 2010 | Year: 2010

This paper proposes an automatic vehicles counting, classification and tracking for identifying Traffic flows in an intersection which is a fundamental task for video surveillance in urban traffic management. In intelligent transportation systems (ITS), especially in field of urban traffic management, intersections monitoring is one of the critical and challenging tasks. Where, objects have different characteristics such as varying velocities, stop and go. Therefore it is necessary to use a hybrid scheme of adaptive background mixture model to learn background model faster and more accurately, instead of using single rate of adaptation, which is not adequate. The main focus of this paper is to analyze activities at intersection in number of traffic zones for counting and classifying vehicles and then tracking to extract traffic flows which assists in regulating traffic lights for using in smart cameras. Traffic zones definition in intersection video, based on trajectories clustering; greatly reduce the time and volume of computation. Smart camera's fundamental purpose is to efficiently reduce the transmission rate and also analyze an intersection scene and report statics and information of interest which is not an image. Ground-truth experiments with urban traffic sequences show that our proposed algorithm is very promising relative to results using other techniques. ©2010 IEEE. Source

Farhadian M.,Iranian Materials and Energy Research Center | Sangpout P.,Iranian Materials and Energy Research Center | Hosseinzadeh G.,Islamic Azad University at West Tehran
Journal of Energy Chemistry | Year: 2015

The shape of nanostructure has important effects on their properties, therefore in this study, we have prepared and characterized three different morphologies of WO3 nanostructures i.e. nanorod, nanosphere and nanoplate for surveying shape effect on their photocatalytic properties toward degradation of Rhodamine B (RhB) dye. Obtained results show that nanoplate WO3 in comparison with others has the best photocatalytic activity. According to SEM, and photocatalytic degradation results, the reason for this behavior is the sharp edges and corners of WO3 nanoplates. Because of their low coordination number, atoms located in the edges and corners of the WO3 nanoplates have more activity, adsorb more RhB and therefore give more photocatalytic activity to the WO3 nanoplates. Using of different scavengers showed that hydroxyl radicals are mainly responsible for photocatalytic activity of WO3 nanoplates and nanospheres but for WO3 nanorods, superoxide radicals are the main photocatalytic degradation agents. © 2015 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences. Published by Elsevier B.V. Source

Gholamzadeh Chofreh A.,Buein Zahra Technical University | Gholamzadeh Chofreh A.,University of Technology Malaysia | Goni F.A.,National University of Malaysia | Klemes J.J.,Pazmany Peter Catholic University | Zeinalnezhad M.,Islamic Azad University at West Tehran
Journal of Cleaner Production | Year: 2016

Sustainability has become a business imperative and every organization needs to respond it. In practicing sustainable organizations, practitioners require to implement Sustainable Enterprise Resource Planning (S-ERP) systems in order to aid them in solving a segregation problem over extended value chain. The concept of the S-ERP system can be adopted from an Enterprise Resource Planning (ERP) system, however, they have distinction in terms of philosophical perspective. S-ERP system adds new dimensions of complexity, including new data types, new sources of data, and new stakeholders. It is more challenging to be implemented successfully than ERP system. Although various software vendors have developed S-ERP software applications, however, the organizations still have a difficulty to implement it due to lack of master plan that provides a holistic approach to implement the system. This problem motivates the researchers to introduce a concept of the S-ERP master plan in this study. Generally, the design of the master plan is developed based on the concept of project management as it can handle complex and complicated projects. The structure of the master plan contains of three essential components: roadmap, framework, and guidelines. These three components are closely interrelated and each of them has its own role in the S-ERP system implementation. An introduction of the S-ERP master plan concept in this paper perhaps would give a bird's eye view to the practitioners about the imperative of the master plan in order to mitigate problems that occur during the S-ERP implementation projects. © 2016 Elsevier Ltd. Source

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