Hegel's ontology of power : the structure of social domination in capitalism

, Book Abazari, Arash

Cambridge University Press 2020

Developing a Continuous Location Routing Model and Providing a Hybrid Algorithm Based on Automatic Clustering

, M.Sc. Thesis Sharif University of Technology Sarabi, Ali (Author) ; Najafi, Mehdi (Supervisor)

Abstract

Generally, the costs of logistics and distribution are included in the significant share of the product price. Hence, choosing appropriate decisions and reducing these costs can have an important effect in reducing the price of products and services, increasing the competitiveness of enterprises. One of the most important measures, in order to achieve this goal, is to integrate location of distribution centers and the routing paths of goods. That how these decisions are made in the networks and discrete problems seriously has been taken into consideration but in continuous areas due to the complexity has not been studied a lot by scholars. In this study, we try to develop a model for...

Design and simulation of new soft-switched three-port half bridge converter with extended zvs range

, Article 27th Iranian Conference on Electrical Engineering, ICEE 2019, 30 April 2019 through 2 May 2019 ; 2019 , Pages 602-608 ; 9781728115085 (ISBN) Alipour Sarabi, R ; Jahani, M ; Oraee, H ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2019

Abstract

Multi-port converters (MPC), used in multi-input/multi-output power electronic systems have low cost, low weight and low mass integrated control system. Besides these converters offer bidirectional and isolated ports, which are inevitable in some applications. Three-Port Half Bridge Converters (TPHBC) are the ones which have the lowest component count. But these converters suffer from a low Zero Voltage Switching (ZVS) range that is lost in medium to low load powers. Low ZVS range cause low efficiency, especially in low output powers. In this paper a modified Pulse Width Modulation (PWM) technique is introduced to increase the ZVS range of main switches which results higher efficiency and...

Parametric Studies on the FEM Analysis of Foam Core Sandwich Panels with Holes

, M.Sc. Thesis Sharif University of Technology Vakilazad Sarabi, Ali (Author) ; Mofid, Masoud (Supervisor)

Abstract

The aim of the work presented in this thesis is deal with some of the aspects in the FEM analysis of sandwich panels containing holes which comprised with foam core. It is a new topic in this field; so the activities that have been done about this case are poor with respect to its performances in engineering. The main emphasis is placed on the treatment of the foam core since the core often is the weakest part of the sandwich and therefore in many ways governs the capacity and lifetime of the whole sandwich structure. Because of increasing application including construction, aircraft and transportation, marine and etc., different load conditions are considered for the analysis and...

Development of a three-dimensional magnetic equivalent circuit model for axial flux machines

, Article IEEE Transactions on Industrial Electronics ; Volume 67, Issue 7 , 2020 , Pages 5758-5767 Alipour-Sarabi, R ; Nasiri Gheidari, Z ; Oraee, H ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2020

Abstract

Numerical and analytical methods are two methods to evaluate the performance of electrical machines. This article provides a comparison between numerical and analytical methods. Electrical machine software typically uses numerical methods to solve the electromagnetic equations. On the other hand, analytical methods are faster and more intuitive. A general analytical modeling technique to evaluate the performance of axial flux machines including but not limited to wound rotor resolvers is presented here. The proposed model is based on the actual three-dimensional (3-D) magnetic equivalent circuit (MEC). The accuracy of the proposed model depends on the number of radial layers in the...

Slotless disk type resolver: a solution to improve the accuracy of multi-speed wound rotor resolvers

, Article IEEE Transactions on Transportation Electrification ; 2021 ; 23327782 (ISSN) Moheyseni, A ; Nasiri Gheidari, Z ; Alipour Sarabi, R ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2021

Abstract

A common solution for increasing the accuracy of wound-rotor (WR) resolvers is to increase the number of poles. To achieve a compact design, fractional slot concentrated winding is used for multi-pole WR resolvers. However, employing such windings leads to rich sub-harmonics in the induced voltages. To suppress these undesirable sub-harmonics, multi-layer windings with appropriate shifting angle between the layers is suggested. However, the said shifting angle is limited by the slot pitch so that the capability of the multi-layer winding is not utilized fully. To overcome the mentioned deficiency a slotless disk type configuration is proposed in this paper. Then, an optimization based on the...

Slotless disk type resolver: a solution to improve the accuracy of multi-speed wound rotor resolvers

, Article IEEE Transactions on Transportation Electrification ; Volume 8, Issue 1 , 2022 , Pages 1493-1500 ; 23327782 (ISSN) Moheyseni, A ; Nasiri Gheidari, Z ; Alipour Sarabi, R ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2022

Abstract

A common solution for increasing the accuracy of wound-rotor (WR) resolvers is to increase the number of poles. To achieve a compact design, fractional slot concentrated winding (FSCW) is used for multi-pole WR resolvers. However, employing such windings leads to rich sub-harmonics in the induced voltages. To suppress these undesirable sub-harmonics, multi-layer windings with an appropriate shifting angle between the layers are suggested. However, the said shifting angle is limited by the slot pitch so that the capability of the multi-layer winding is not utilized fully. To overcome the mentioned deficiency, a slotless disk type configuration is proposed in this article. Then, an...

About Space Time

, M.Sc. Thesis Sharif University of Technology Naderi, Mojtaba (Author) ; Rastegar, Arash (Supervisor)

Abstract

Einstein's general theory of relativity is an admirable successful and unifier geometrical modeling among concepts of space, time and gravity. This theory along with special theory of relativity made a massive change in our physical view and this, especially in its historical context, has deep and interesting consequences in man's philosophical viewpoint which can be studied. Some parts of this thesis relates to these consequences. Some of these interesting consequences may be hidden by computional or mathematical viewpoint and often these equations do not contain enough intuition. in one part, we provide a formulizatin of Einstein's equaion that is intuitional which can be translated in...

Tropical Algebraic Geometry

, M.Sc. Thesis Sharif University of Technology Yaghmayi, Keyvan (Author) ; Rastegar, Arash (Supervisor)

Abstract

Tropical algebraic geometry is a fairly new branch in geometry which is called so in honor of Brazilian mathematician Imre Simon who was pioneer of this field.The set equipped with the addition and multiplication is a semifield.Algebraic geometry objects like algebraic varieties can be defined over.Polynomials and rational functions are defined over.The functions that they define are piecewise linear and concave functions and the set of points where they are nonlinear is a tropical variety which is a concave polyhedral. Thus, tropical algebraic geometry is a piecewise linear version of algebraic geometry.Another approach to tropical algebraic geometry comes back to the works of Russian...

Evaluating the Effect of Crumb Rubber on the Fracture Properties of Asphaltic Materials Using a Standardized Composite

, M.Sc. Thesis Sharif University of Technology Ghanbari, Amir (Author) ; Motamed, Arash (Supervisor)

Abstract

Fatigue cracking has a major impact on the performance of flexible pavements. Many test methods have been established to evaluate and estimate the fatigue life of asphaltic materials. Most of these test methods cannot successfully examine the fatigue properties of asphaltic materials. Recent studies demonstrate that using a standardized composite, which consists of glass beads and asphalt binder, can simulate the stress states that binder experiences in the field. This research used standardized composite to investigate the effect of crumb rubber on the fracture properties of asphaltic materials. To validate the test results, the authors conducted fracture tests on the Fine Aggregate Matrix...

Novel View Synthesis Using Light Field Camera

, M.Sc. Thesis Sharif University of Technology Bemana, Mojtaba (Author) ; Amini, Arash (Supervisor)

Abstract

In the last two decades, novel view synthesis has become increasingly important in the movie and game industries. The new generated views correspond to virtual viewpoints, where no real camera has taken snapshot. Depending on the amount of available information from the scene, different approaches have been proposed to create novel views. If the depth information is available, then by knowing camera relative motion, novel views can be constructed. The conventional cameras only record the intensity of the captured scene, and discard the depth information. In the recent concept of light field cameras, by locating an array of micro-lenses between the camera sensor and the main lens, one can...

Developing a New Method to Evaluate and Quality Control of Chip Seal

, M.Sc. Thesis Sharif University of Technology Jahi, Hamed (Author) ; Motamed, Arash (Supervisor)

Abstract

Chip seal is one of the most economical pavement maintenance practice that extends pavement life. To ensure chip seal good performance several quality control methods have been developed. However, most of these methods are qualitative and only measure the stone loss under a certain number on loading. This research developed a new method for quality control of chip seal, based on the assumption that characteristics of the bond between chips and pavement surface play a key role in chip seal performance. To validate this test method, the authors used a wheel track loading test. The results from this research clearly showed that the characteristics of the bond between chips and pavement surface...

Investigating the Effect of Various Additives on the Curing Time of Chip Seal and Chip Seal Treatments in Different Climate Conditions.

, M.Sc. Thesis Sharif University of Technology Sadeghi, Amir (Author) ; Motamed, Arash (Supervisor)

Abstract

Recently, a new method to investigate chip seal performance has developed by a research team at Sharif University of Technology. This study investigates the effect of various additives such as CRM, SBR Latex, Hydrated Lime and Ordinary Portland Cement (OPC), on the curing time of chip seal by this method. In addition, the chip seal treatments were investigated in different climate conditions like Wet and Wet-Freeze zones. The overall performance of mixture specimens evaluated using creep loading test. In fact, the bonding properties between aggregates and surface of Hot Mix Asphalt measured. The test results were analyzed by using of the work and time parameters. These parameters were...

Brandom’s Conception of Trust

, M.Sc. Thesis Sharif University of Technology Razzaghi, Ashkan (Author) ; Abazari, Arash (Supervisor)

Abstract

A Spirit of Trust results from Brandom's thirty-year effort to give a pragmatistic reading of Hegel's Phenomenology of Spirit. In A Spirit of Trust, Brandom reformulates Hegel's arguments in the language of contemporary Analytical Philosophy and gives a unique interpretation of Hegel's key concepts. In this Thesis, we will examine one of its key concepts, namely, Trust; We will pursue the following questions: First, What is Trust? And what is its connection to other aspects of Brandom's philosophy? Second, How does Trust help us in overcoming Alienation? Third, Are Confession and Forgiveness, which are the constitutive concepts of Trust, psychologistic or normative? Fourth, What is the...

Design of Stress Absorbing Membrane Interlayer (Sami) and Overlay to Reduce Reflective Cracking

, M.Sc. Thesis Sharif University of Technology Taheri, Amir (Author) ; Motamed, Arash (Supervisor)

Abstract

Cracks or construction joints in an overlayed pavement can propagate into the overlay over time due to various factors, the most important of which are traffic and temperature loading, and cause premature failure of pavement. This propagated cracks are called reflective cracks and the phenomenon of crack propagation into the overlay is called reflective cracking. Use of stress-absorbing membrane interlayers (SAMI) is one of the ways can reduce the occurrence of reflective cracking and/or delay it. One of the most common SAMIs is an asphalt mixture consists of bitumen and aggregate layed down between the old and the veneer layers. The function of the SAMI depends on several factors such as...

An Investigation on the Effect of Filler Type and Content on the Performance of Asphaltic Materials

, M.Sc. Thesis Sharif University of Technology Hamidi, Arman (Author) ; Motamed, Arash (Supervisor)

Abstract

The objective of this research is evaluating the effect of filler type and content on the characteristics of asphaltic materials. The properties of the asphalt mixture are greatly influenced by its components. As asphalt mixtures are composed of two prominent components, aggregates and binder, the change in type and contents of these materials may lead to altering the performance of asphalt mixtures. Aggregates in the asphalt mixtures are categorized into three groups based on their particle sizes: coarse aggregate, fine aggregate and mineral filler. The effect of filler on the characteristics of asphalt mixtures can be examined by changing the type and content of filler and holding the...

The Analysis of HDR Video Reconstruction Methods

, M.Sc. Thesis Sharif University of Technology Ghaffari, Mahdi (Author) ; Amini, Arash (Supervisor)

Abstract

The conventional cameras and displays do not have the ability to record and display the full brightness of the world around us. These deficiencies have led to the development of methods known as High Dynamic Range Imaging. Most of the work done in this field falls into two groups: compression of the light range and its expansion. In compression, the brightness range is intended to display content with a high dynamic range in simple displays. But the goal of expanding the brightness range is to reconstruct HDR content from a low dynamic range one. In addition to the above classification, this field is also categorized based on the type of content (image or video). In this study, the...

Investigating Different Crumb Rubber Modification Methods in Cold Mix Asphalts

, M.Sc. Thesis Sharif University of Technology Daneshvar, Dana (Author) ; Motamed, Arash (Supervisor)

Abstract

Studies have shown that use of crumb rubber additive can improve the mechanical and performance properties of hot mix asphalts. Nowadays, different methods are used for adding crumb rubber to asphalt mixtures. However, no comprehensive research has been done to investigate the effects of these different methods in cold mix asphalts. In this research, different crumb rubber modification methods were evaluated to compare their effects on cold mix asphalts’ performance. In this regard, various crumb rubber modification methods, such as pre blending crumb rubber into the asphalt before emulsification, post blending crumb rubber into the prepared asphalt emulsion and blending crumb rubber with...

Scene Reconstruction Using Light Field Camera

, M.Sc. Thesis Sharif University of Technology Mollakhani, Arman (Author) ; Amini, Arash (Supervisor)

Abstract

Nowadays in movie and photography industry, scene reconstruction is of high importance. Capturing data containing the depth information of the scene can help us achieve this goal more easily. Ordinary Cameras do not record depth information of the scene so they can’t ease our task. In 2005, some Stanford Researchers, inspired by Adelson’s work, were able to build the first camera that captures depth information. They called it the light filed camera. In these cameras an array of microlenses is inserted below the main lens. By doing this the camera is able to capture the rays’ intensities and their directions in space too. With this kind of information, we are able to obtain the depth of a...

Graph Learning on Images using Kron-Reduction

, M.Sc. Thesis Sharif University of Technology Eini, Mohammad (Author) ; Amini, Arash (Supervisor)

Abstract

In this project, we are going to face the problem of learning a graph on images with big sizes which has many applications in image processing like image segmentation. There are two main obstacles to doing so. One is the fact that the task of graph learning becomes immensely time-consuming when we have a large number of nodes. The other is the memory shortage since most computers do not have rams with big capacities, which is a requirement when the number of nodes is too high. We are going to suggest two suboptimal solutions for finding a sparse graph on images with respect to smoothness criteria on the Laplacian matrix of the acquired graph and reduce the time needed for this task. Then we...