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    Proceedings of the first Regional Conference on Magnetic and Superconducting Materials (MSM-99); Tehran, Iran, 27-30 Sept. 1999

    , Book Regional Conference on Magnetic and Superconducting Materials (1st: 1999: Tehran, Iran) ; Akhavan, M ; Jensen, J ; Kitazawa, K
    World Scientific  2000

    Analysis and data-based reconstruction of complex nonlinear dynamical systems : using the methods of stochastic processes

    , Book Rahimi Tabar, M. Reza
    Springer International Publishing  2019
    This book focuses on a central question in the field of complex systems: Given a fluctuating (in time or space), uni- or multi-variant sequentially measured set of experimental data (even noisy data), how should one analyse non-parametrically the data, assess underlying trends, uncover characteristics of the fluctuations (including diffusion and jump contributions), and construct a stochastic evolution equation?
    Here, the term "non-parametrically" exemplifies that all the functions and parameters of the constructed stochastic evolution equation can be determined directly from the measured data.
    The book provides an overview of methods that have been developed for the analysis of... 

    Finite Element Modeling of Cohesive Crack Growth Using Adaptive Mesh Refinement

    , M.Sc. Thesis Sharif University of Technology Majd Ardakani, Keivan (Author) ; Khoei, Amir Reza (Supervisor)
    Under Linear Elastic Fracture Mechanics (LEFM) assumptions, the stress at the crack tip is theoretically infinite. Clearly all materials have a finite strength, thus there will always be a plastified zone around the crack tip. If the size of plastic zone is not small compared to the crack size, then linear elastic assumptions are not applicable and a nonlinear model must be used. This damaged zone is referred to as a plastic zone for metals, and a fracture process zone for cementitious materials and ceramics. In this regard a discrete extrinsic cohesive crack model with bilinear traction separation constitutive law, i.e. softening function, is employed and crack propagation is investigated.... 

    An Integrated Methodology of Life Cycle Assessment and Emergy for Evaluation of Tehran’s Municipal Solid Waste Management System

    , M.Sc. Thesis Sharif University of Technology Falahi Ardakani, Mohammad (Author) ; Avami, Akram (Supervisor)
    By changing the approaches towards the waste management, it is possible to affect the resource depletion. This research is focused on economic and environmental impacts of waste production and treatment. In this research, the municipal solid waste management system have been evaluated by an integrated approach considering the Life cycle assessment and Emergy assessment methods. The integrated method have been used to evaluate the waste management system more fundamentally and analyze some upstream indicators which are related to natural resource scarcity. At first, some scenarios have been developed based on Life cycle assessment containing possible configurations of technologies. Then, an... 

    Development and Application of a Model for Assessing the Sustainability of Energy supply System

    , M.Sc. Thesis Sharif University of Technology Fotouhi Ardakani, Saeedreza (Author) ; Saboohi, Yadollah (Supervisor)
    Depletion of fossil energy reserves and rapid growth of energy demand have been challenging issues in the energy sector. Proper solution of these issues requires development of an integrated and comprehensive approaches. Such conceptual framework could provide an appropriate means for studying energy problems and anlysing the development of efficient technologies which could improve the economic viability and reduce the impact of energy system on the environmental. Therefore, analytical tools need to be developed further and they could be applied for systematic analysis of impact of new energy technologies on the economical efficiency and environmental compatibility of energy... 

    Computational Simulation of the Effect of Breathing Particle Mass and Breathing Frequency on a Human Respiratory System

    , M.Sc. Thesis Sharif University of Technology Goodarzi Ardakani, Vahid (Author) ; Tayyebi Rahni, Mohammad (Supervisor)
    Our surrounding environment is full of particles with different sizes. These suspended particles enter our body through respiration process, which of course has some negative effects. Therefore, it is very important to comprehend the mechanisms and the effective parameters on these particles motion and their deposition inside the human airway. This work numerically investigates the effects of particles mass and breathing frequency on the deposition of particles in human respiratory system. To this end, a realistic 3-D model of human respiratory system geometry, including nostrils, vestibule, nasal cavity, human sinuses, nasopharynx, oropharynx, larynx, trachea, and main bronchus has been... 

    Sustainable Analysis of Unions Uses Axiomatic Design Theory with Focus on European Union

    , M.Sc. Thesis Sharif University of Technology Torbati, Mostafa (Author) ; Malaek, S. M (Supervisor)
    In this project, we examine the stability or sustainability issue in unions, in other words we want to know whether integration in European Union is stable? Countries have positive attitude toward unions and being member in unions is at special priorities. The main reason for countires is improve economy and national Security.
    The main question in this research is modeling European Union with Axiomatic Design Theory and analysis of sustainability based on this theory. This study has attempted to push Axiomatic Design Theroy in the new field of Systems Engineering and also it gives a new and differnet approach to stability.

    A Critical Reading of Russel on Causation

    , M.Sc. Thesis Sharif University of Technology Moulavi Ardakani, Reza (Author) ; Taghavi, Mostafa (Supervisor)
    Causation is one of the most old and difficult problems of Metaphysics which is also important in Science and Philosophy of Science. There are three different views in the Ontology of Causation—Eliminativism, Fundamentalism and Reductionism. Also we know that the Ontology of Causation can be equated with the question of the difference between Causal and Non-Causal series of events, such that the answers to this question are correspondent to the mentioned views: 1)Eliminativism: There is not any difference between those two series and the concept of Causation does not have any objective or external being. 2)Primitivism: There is a difference between them but it can not be explained in any... 

    , M.Sc. Thesis Sharif University of Technology (Author) ; Golshani, M (Supervisor)
    Most of local thinkers ,who were influenced by Western philosophers of science, and have spoken about religious knowledge, have selected experimental science as standard science and Have tried to find a way trough cultural and other non-scientific channels of science to influence the field of human knowledge by religious teaching's .This expert's are generally opposed to positivist’s models of science, but because of the nature of the Western atmosphere that they breathe, consider the experimental science as the main model of knowledge and the experience as the main method of Acquisition of knowledge. Paya is also one of this thinkers who is influenced by Karl Popper's ideas about the... 

    Efficient Implementation of Machine Learning Methods for Resource-Constrained Devices

    , Ph.D. Dissertation Sharif University of Technology Taheri Ardakani, Farhad (Author) ; Bayat Sarmadi, Siavash (Supervisor)
    Nowadays, Machine learning algorithms are used to perform different tasks. Due to the high computational complexity of machine learning methods especially deep learning methods, running these methods efficiently on resource-constrained applications such as the Internet of Things (IoT) is challenging. To address the mentioned limitation, many devices send the raw data to the edge or cloud for classification due to limited computational power. This brings security and privacy issues and increases computational latency and network traffic. Hardware accelerators can be used to overcome this challenge by improving the computational power of the end nodes. Power and energy consumption with... 

    Real-Time Fusion of Asynchronous Data in Distributed Sensor Networks

    , Ph.D. Dissertation Sharif University of Technology Talebi, Hadi (Author) ; Hemmatyar, A. M. Afshin (Supervisor)
    Real-time asynchronous data fusion for high-speed phenomena is an important and challenging task in the sensor networks. Examples of data fusion applications in sensor networks are: managing the traffic of maneuvering airplanes and ground vehicles in airside areas of an airport, traffic management in streets and roads, Driver Assistance Systems, guidance of antiaircraft and antimissile missiles. In all the data fusion applications the estimation of the required variables is necessary.
    In this research two methods are introduced for real-time asynchronous data fusion, especially for track-to-track fusion of high-speed phenomena in sensor networks. The effectiveness and usability of these... 

    Behavioral Modeling and Homogenizing of Materials Containing Rough Crack

    , M.Sc. Thesis Sharif University of Technology Shaker Ardakani, Kamal (Author) ; Mofid, Masoud (Supervisor) ; Khezrzadeh, Hamed (Co-Advisor)
    The present paper proposes a micromechanical damage model for two and three dimensional Representative Volume Element (RVE) with randomly distributed cohesive rough slit-like and penny-shaped micro cracks (Barenblatt-Dugdale type). First, the influence of crack roughness on the crack opening under macro hydrostatic stress state is studied and then the energy release contribution to material damage process is estimated. Considering the fractality of the crack trajectories yields to lower values of the volume crack opening. This will result in lower energy release rate in RVE and higher levels of material resistance. Based on the energy release rate of RVE, the effective material properties... 

    The Role of Driver Distraction in Traffic Accidents

    , M.Sc. Thesis Sharif University of Technology Razi Ardakani, Hesamoddin (Author) ; Kermanshah, Mohammad (Supervisor)
    Traffic accidents are one of the leading causes of death in the world. During the last decade driver distraction played a significant role in occurrence of road crashes. Since the issue is becoming a widespread concern in many countries, the main objective of the present study was to investigate the influence of driver distraction on the various aspects of traffic accidents. In this regard, the data source of reported crashes of the United States of America in year 2010 is used. Three main property of crashes including severity, type, and avoidance maneuver are studied. Analysis of accidents severity by generalized ordered logit model indicated that phone usage and in-vehicle distraction... 

    Light Duty Vehicles' Emission Reduction Potentials in Megacities
    Using New Powertrain Technologies (Case Study: Tehran)

    , M.Sc. Thesis Sharif University of Technology Askariyeh, Mohammad Hashem (Author) ; Erhami, M. (Mohammad) (Supervisor) ; Pourzahedi, H. (Hossein) (Supervisor)
    Tehran is one of the most polluted megacities in the world, and based on different studies, vehicular sources are responsible for most of the criteria pollutant emissions in this city. The number of vehicles on the streets has been increased drastically leading to growing amount of emission and this trend is continuing. In order to reduce the amount of vehicular emission, it is vital to investigate the factors affecting vehicles emission in this city. This could help to find efficient solutions to improve the situation. Hence, a low-cost methodology to estimate the vehicular emissions is developed. In this... 

    Axisymmetric Contact of a Rigid Inclusion Embedded at the Interface of a Piezoelectric Bimaterial

    , M.Sc. Thesis Sharif University of Technology Moeini Ardakani, Sina (Author) ; Mohammadi Shodja, Hossain (Supervisor)
    The axisymmetric contact problem of a rigid inclusion embedded in the piezoelectric biomaterial frictionless interface subjected to simultaneous far-field compression and electric displacement is addressed. With the aid of a robust technique, the coupled governing integral equations of this mixed boundary-value problem are reduced to decoupled Fredholm integral equations with a constraint equation. A useful limiting case for the contact problem of transversely isotropic bimaterials is addressed. The present solution is analytically in agreement with the existing solution for an isotropic bimaterial. Selected numerical results of interest to engineering applications including the radius of... 

    Fusion of Inertial Navigation and Visual Odometry

    , M.Sc. Thesis Sharif University of Technology Aarabi Ardakani, Mohammad Sajjad (Author) ; Sayyadi, Hassan (Supervisor)
    The error of the inertial navigation system increases over time due to the cumulative errors of sensors. Inertial navigation system couples with sensors or other systems to prevent navigation system errors growth. One of the systems that can be used to couple with inertial navigation system is visual odometry. Visual odometry can calculate relative position of the camera at any time and estimate the device path through input images from one camera (Monocular) or multiple cameras (Stereo). Visual odometry algorithms improvements in recent decade cause this system used as real time. In this thesis, DSO algorithm, which is a direct method and monocular approach, couples with an inertial system... 

    Energy Optimization of an Arm with Seven Degrees of Freedom Using Imperialistic Competitive Algorithm (ICA) and Designing an Artificial Neural Network

    , M.Sc. Thesis Sharif University of Technology Abedini, Amin (Author) ; Ahmadian, M.T (Supervisor) ; Asghari, M (Supervisor)
    In recent years, great attention has been devoted to the design of artificial arms. The most crucial problem in such a design is the trajectory of movement. In this paper, a seven degree of freedom arm is modeled and simulated. Also, the optimization method named “Imperialistic Competitive Algorithm” has been modified and better performance of the new version is presented. Energy optimization is performed based on trajectory of the arm with angular velocity, angular acceleration and joint angles using modified imperialistic competitive algorithm (ICA). Considering ICA as a fast optimization algorithm, it would be reasonable to use this algorithm for robotic purposes for online answering. The... 

    Fabrication of Al Based Nanocomposite with Al2O3 and Al3Ti Reinforcements by Mechanical Milling and Press and Sintering (In situ method) and Investigation of Its Wear Behavior

    , M.Sc. Thesis Sharif University of Technology Shabani Nezhad, Parisa (Author) ; Seyed Reihani, M (Supervisor)
    In this study, Aluminium based nanocomposite with Al3Ti and Al2O3 nanoparticles have been elaborated by mechanical alloying. For this purpose, Al and TiO2 powders have been blended with weight ratios of 10, 20 and 30 percents and were milled using a planetary mill. Morphological variations in different timing periods of mechanical milling process was investigated by Scaning Electron Microscopy (SEM) and The optimal times for alloying were determined for each combination. The pure Aluminium and the powder with 10, 20 and 30%wt reinforcement had coax morphology after respectively for 44, 30, 24 and 14 hours. after studing phase transformations by XRD analysis, the final powders were cold...