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shahidi--narges
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Synthesis and Characterization of Vanadium (IV)-SNO & ONO Tridentate Schiff-Base Complexes and Their Applications in Sulfide and Alcohol Oxidation in Ionic Liquid Media
, M.Sc. Thesis Sharif University of Technology ; Bagherzadeh, Mojtaba (Supervisor)
Abstract
In recent years, application of transition metal biphasic catalytic systems for different reactions is an area of intense research activity. Among these reactions, oxidation of sulfides to sulfoxides and sulfones due to their importance as an intermediate in synthesis of organic compounds is a center of interest. Also, the catalytic conversion of alcohols to the corresponding aldehydes or ketones is a fundamental transformation in both laboratory and industrial synthetic chemistry. From environmental perspectives, the development of new catalytic oxidation systems with molecular oxygen as green oxidant is particularly attractive. In recent years, ionic liquids have been extensively studied...
Agent-based Programming and it's Application Using GOAL
,
M.Sc. Thesis
Sharif University of Technology
;
Ramezanian, Rasoul
(Supervisor)
Abstract
With the significant advances in software engineering and developing complicated systems, it’s important to investigate the interaction between systems. Agentoriented software engineering is a new paradigm for developing distributed intelligent systems. Agent technology currently plays an important role in complex software development. The underlying paradigm offers a large repertoire of original concepts, architectures, interaction protocols, and methodologies for the analysis and the specification of complex systems built as Multi-Agent Systems (MAS). Several efforts, originating from academia, industry, and several standardisation consortium, have been made in order to provide new tools,...
Auto-selection of space-time Interest Points for Action Recognition
Application in Fisherposes Method
,
M.Sc. Thesis
Sharif University of Technology
;
Mohammadzadeh, Narges Hoda
(Supervisor)
Abstract
In this project, a novel action recognition method, named Fisherposes, is proposed, which is improved by several space-time (spatio-temporal) methods afterwards. The proposed method utilizes skeleton data obtained from Kinect sensor. First, pre-processing is performed in which the scales of bodies are canceled and the skeletons become aligned in order to make the method robust to location, orientation, and scale of people. In Fisherposes method, every action is defined as a sequence of body poses. Using the training samples for the poses, a Fisher subspace is created which we name it Fisherposes. Moreover, a novel distance measuring function, named regularized Mahalanobis distance, is...
Seismic Performance Assessment of Highway Bridges According to Method D2 of FHWA 2006 Manual
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
Following inadequate performance of bridges during the past earthquakes, serious attention has been drawn to evaluation of seismic vulnerability of existing bridges and retrofit measures. This research surveys seismic performance of existing bridges according to the latest manual for seismic rehabilitation of highway bridges in America (FHWA2006). This manual introduces six different methods which vary considerably in sophistication, rigor and applicability. This research is based on method D2 (Nonlinear Static Procedure or Pushover Method) in which the seismic demands are determined by elastic methods such as multi-mode response spectrum, or elastic time history method and capacity...
Investigations of Cooling Process and Edge Effects in Sheet Metal Forming by using the Line Heating Technique
, M.Sc. Thesis Sharif University of Technology ; Assempour, Ahmad (Supervisor)
Abstract
Sheet metals are widely used in different industries such as ship building and pressure vessels. In these industries, One important problem is Line Heating Forming. This method needs simple initial equipment and is economically advantageous.In this research heat transfer between gas torch and plate, cooling effects and edge effects are studied more precise. Impingement jet model is used to simulate effect of heat source (flame) and cooling air on plate. The temperature distribution in sheet metal due to the rates of cooling air and heated gas (flame) are calculated by using commercial engineering software, Fluent. Then, the computed temperature field by FLUENT is fed into the ANSYS FEM...
Null Controllability and Stabilizability of Compressible Navier-stokes System in One Dimension
, M.Sc. Thesis Sharif University of Technology ; Hesaraki, Mahmoud (Supervisor)
Abstract
In this thesis we study the exponential stabilization of the one dimensional compressible Navier-Stokes system, in a bounded interval locally around a constant steady state by a localized distributed control acting only in the velocity equation. In fact this is an analysis of a paper that published by Shirshendu Chowdhury, Debayan Maity, Mithily Ramaswamy and Jean-Pierre Raymond in Journal of Differential Equations. We determine a linear feedback law able to stabilize a nonlinear transformed system. Coming back to the original nonlinear system, we obtain a nonlinear feedback law able to stabilize locally this nonlinear system. The result is providing feedback control laws stabilizing...
Investigating Sex Preferences in Iran
, M.Sc. Thesis Sharif University of Technology ; Fatemi, Farshad (Supervisor)
Abstract
The question of whether sex preferences are present in a certain country has long been of interest for economists and demographers. This study first investigates the existence of these preferences among Iranian parents. Next, if any preference are present, it turns to the task of inferring the quality of the observed preferences. There are two widely used methods for addressing these issues in the literature. The first method is to estimate a Logit model which relates the probability of a mother giving birth to a new child, to the sexes of her previous children. The second one is to estimate a Proportional Hazard model in order to investigate the relationship of the time interval between...
Segmented Reconfigurable Bus for SoCs
, M.Sc. Thesis Sharif University of Technology ; Sarbazi Azad, Hamid (Supervisor)
Abstract
Advance in VLSI integration level has realized multi-core system-on-chip. For inter-IP communication on-chip network is proposed as a substitute for simple interconnects such as bus fabrics and expensive point-to-point links. Although onchip networks have some superiorities over simple interconnects, but they need more of real estate resource. Although buses are not scalable, they are still popular for their simple communication mechanism. There are so many proposed mechanisms to make buses more scalable and more popular. Most of them try to change bus structure by segmenting and using reconfigurable methods. In this thesis, we explore buses delay by considering the number of component in a...
Heterogeneous interconnect for low-power snoop-based chip multiprocessors
, Article Journal of Low Power Electronics ; Volume 8, Issue 5 , 2012 , Pages 624-635 ; 15461998 (ISSN) ; Shafiee, A ; Baniasadi, A ; Sharif University of Technology
2012
Abstract
In this work we propose using heterogeneous interconnects in power-aware chip multiprocessors (also referred to as Helia). Helia improves energy efficiency in snoop-based chip multiprocessors as it eliminates unnecessary activities in both interconnect and cache. This is achieved by using innovative snoop filtering mechanisms coupled with wire management techniques. Our optimizations rely on the observation that a high percentage of cache mismatches could be detected by utilizing a small subset but highly informative portion of the tag bits. Helia comes in two variations: source-based (S-Helia) and destination-based (D-Helia). S-Helia relies on a global snapshot of remote caches collected in...
Topological Indices in Discreat Dynamical Systems and Application
, M.Sc. Thesis Sharif University of Technology ; Razvan, Mohammad Reza (Supervisor)
Abstract
In order to generalize the Morse Index for fixed points of a flow, Conley introduced an invariant for isolated invariant sets under a flow which is known as Conley Index.However a similar generalization in discrete dynamical systems is more difficult. Category theory, shape theory and algebraic topology have been used in the generalization. In this thesis we propose a construction of Conley index for discrete dynamical systems, which goes along Conley lines as long as it was possible, but certain modifications has been done for convenience. After introducing the index, we will consider some applications: the generalized Morse inequalities and the Morse decomposition. At the end we will...
Effect of electron irradiation on polypropylene films
, Article Plasma Science and Technology ; Volume 13, Issue 2 , 2011 , Pages 194-196 ; 10090630 (ISSN) ; Wiener, J ; Ghoranneviss, M ; Anvari, A ; Sharif University of Technology
2011
Abstract
Effects of both electron beam irradiation on the properties of polypropylene (PP) films and the irradiation on the different layers of a multilayer PP film are studied. A Fourier transform infrared spectroscope was used to investigate the chemical structure of the films. The results showed that the chemical properties of the first layer were improved, that is, more functional groups responsible for dye ability and hydrophilicity of the film were produced on its surface, while noticeable improvement was not detected on the surface of other layers. This was also confirmed by testing the dye ability of the layers. However, the results obtained by atomic force microscopy showed that the electron...
Estimation of current-induced pile groups scour using a rule-based method
, Article Journal of Hydroinformatics ; Volume 15, Issue 2 , September , 2013 , Pages 516-528 ; 14647141 (ISSN) ; Etemad-Shahidi, A ; Ataie-Ashtiani, B ; Sharif University of Technology
2013
Abstract
Scour phenomenon around piles could endanger the stability of the structures placed on them. Therefore, an accurate estimation of the scour depth around piles is very important for engineers. Due to the complexity of the interaction between the current, seabed and pile group; prediction of the scour depth is a difficult task and the available empirical formulas have limited accuracy. Recently, soft computing methods such as artificial neural networks (ANN) and adaptive neuro-fuzzy inference system (ANFIS) have been used for the prediction of the scour depth. However, these methods do not give enough insight into the generated models and are not as easy to use as the empirical formulas. In...
Efficient method for oxidation of ketones to esters with 4-aminoperoxybenzoic acid supported on silica gel
, Article Synthetic Communications ; Volume 38, Issue 12 , 2008 , Pages 2037-2042 ; 00397911 (ISSN) ; Hashemi, M. M ; Shahidi Zandi, M ; Sharif University of Technology
2008
Abstract
4-Aminoperoxybenzoic acid supported on silica gel was found to be a versatile and efficient oxidant for the oxidation of ketones to esters. Copyright © Taylor & Francis Group, LLC
Numerical Study and Sensitivity Analysis of a Flowmeter Based on a Fluidic Oscillator
, M.Sc. Thesis Sharif University of Technology ; Ebrahimi, Abbas (Supervisor) ; Ghamkhar, Kamran (Co-Supervisor)
Abstract
In this thesis, the flow behavior in a fluidic oscillator-based flowmeter is investigated using two-dimensional numerical simulations and experimental tests. The primary objective of this study is to analyze the effect of geometrical parameters and flow conditions on the performance of the fluidic oscillator and to determine the relationships between key parameters such as oscillation frequency, oscillation amplitude, pressure drop, and the standard deviation of the Strouhal number. The numerical simulations are conducted using the Unsteady Reynolds-Averaged Navier-Stokes (URANS) model and the finite volume method, with the k−ω SST turbulence model applied for flow modeling. The computations...
Analysis of People Appearance Variation in Multi-Camera Networks
, M.Sc. Thesis Sharif University of Technology ; Behroozi, Hamid (Supervisor) ; Mohammadzadeh, Narges Hoda (Co-Supervisor)
Abstract
Analysis of people appearance variation in multi-camera networks for person re-identification or person retrieval is a very challenging problem due to the many intra-class variations between different cameras. Like any problem in the field of machine vision, it is generally divided into two parts. The first part is feature extraction and the second part is feature matching for person retrieval. So far, various methods have been proposed for the extraction of discriminative features, which are generally divided into three categories: stripe-based, patch-based, and body-based methods. However, methods based on stripes, although simpler, have performed better due to their greater compatibility...
Software Product Line Testing Optimization Based on Regression Test Techniques
, M.Sc. Thesis Sharif University of Technology ; Mirian Hosseinabadi, Hassan (Supervisor)
Abstract
A software product line is a set of products with common features. The design of this set is such that the core assets that are common features between products are implemented only once. All products in the product line use the core assets to reduce development costs. The number of products that can be produced in a software product line is exponential to the number of capabilities in the core assets and the set is very large, so the cost of testing the software product line will be very high. In the software product line testing, various methods have been provided to reduce costs, among which we can mention product prioritization and regression test techniques. In prioritization, the...
Optimization of Gas Allocation to a Group of Wells in Gas Lift
, M.Sc. Thesis Sharif University of Technology ; Ghotbi, Siroos (Supervisor) ; Amin Shahidi, Babak (Supervisor)
Abstract
When the reservoir energy is too low for the well to flow, or the production rate desired is greater than the reservoir energy can deliver, it becomes necessary to put the well on some form of artificial lift to provide the energy to bring the fluid to the surface. Continuous flow gas lift is one of the most common artificial lift methods widely used in the oil industry. In continuous gas lift, gas at high-pressure is injected in a suitable depth into the tubing, to gasify the oil column, and thus facilitate the production. Every well has an optimal gas lift operating point at which it will produce the most fluid. Ideally, if there is no restriction in the total amount of gas available,...
Plasma effects on anti-felting properties of wool fabrics
, Article Surface and Coatings Technology ; Volume 205, Issue SUPPL. 1 , December , 2010 , Pages S349-S354 ; 02578972 (ISSN) ; Rashidi, A ; Ghoranneviss, M ; Anvari, A ; Wiener, J ; Sharif University of Technology
2010
Abstract
Low temperature plasma (LTP) is nowadays an intensively investigated superficial treatment of wool. In this work we have investigated the effect of LTP on wool fabric under different conditions. The effect of the position of samples inside the reactor and the kind of gases used as discharge medium has been also investigated. The results show that not only the topography of the surface is modified but also the chemical composition of the surface. It is shown that the hydrophilicity of the samples and also their shrink resistance and anti-felting behavior have improved significantly under LTP treatment. The results show that the shrinkage of 30.1% for untreated samples has reduced to about...
Modeling and optimization of an elliptical shape ultrasonic motor using combination of finite element method and design of experiments
, Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 12 November 2010 through 18 November 2010, Vancouver, BC ; Volume 8, Issue PARTS A AND B , 2010 , Pages 491-496 ; 9780791844458 (ISBN) ; Akbari, J ; Shahidi, A. R ; Darki, A. A ; Sharif University of Technology
2010
Abstract
Standing-wave ultrasonic motors are a modern class of positioning systems, which are used to deliver a high precision linear or rotary motion with an unlimited stroke. The design process should be performed through an effective optimization algorithm in order to guaranty proper and efficient function of these motors. An optimization method of ultrasonic motors is proposed based on the combination of finite element method and factorial design as a design of experiments in this study. The results show the ability of this method in optimal design of ultrasonic motors especially those which have a complex structure and multi modes operation principle
Aluminum coatings on cotton fabrics with low temperature plasma of argon and oxygen
, Article Surface and Coatings Technology ; Volume 201, Issue 9-11 SPEC. ISS , 2007 , Pages 5646-5650 ; 02578972 (ISSN) ; Ghoranneviss, M ; Moazzenchi, B ; Anvari, A ; Rashidi, A ; Sharif University of Technology
2007
Abstract
In this article, we have studied the properties (especially water repellency) of cotton coated by a thin layer of aluminum. The process has been performed in a low temperature plasma medium, using a magnetron sputtering device. We have also investigated the effect of different gases such as argon and oxygen as the discharge medium on the properties of the obtained samples. The results which are exposure time dependent show a good repellent property for 30 min of treating in argon medium under the condition of our experiment. However, when O2 is used in the system, the cotton property changes to become hydrophilic of which the factor decreases as we increase the time of treating. © 2006...