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farshi-taghavi--mahdis
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Design and Optimization of Carbon Capture System from Exhaust Gases in the Process Industries
, M.Sc. Thesis Sharif University of Technology ; Rashtchian, Davood (Supervisor) ; Seif, Shayan (Co-Supervisor)
Abstract
Carbon dioxide is one of the main geenhouse gases emitted from factories as well as transportation vehicles that adversely affect the atmosphere and cause global warming. Among the proposed solutions to reduce carbon dioxide in the atmosphere, carbon dioxide separation would be the most viable medium-term approach. However, the high cost of carbon dioxide separation prevents the development of carbon dioxide absorption technologies. Therefore, it seems that integrating separation and production processes is the most efficient way to save energy and reduce carbon emissions. This method decrease a high proportion of the energy consumption in upstream operations (carbon dioxide removal,...
A memory efficient algorithm for multi-dimensional wavelet transform based on lifting
, Article 2003 IEEE International Conference on Accoustics, Speech, and Signal Processing, Hong Kong, 6 April 2003 through 10 April 2003 ; Volume 6 , 2003 , Pages 401-404 ; 15206149 (ISSN) ; Kasaei, S ; Sharif University of Technology
2003
Abstract
Conventional implementation of multi-dimensional wavelet transform (e.g. 3-D wavelet) requires whether a high amount of "in access" memory or a continual access to slow memory of a processor which makes it infeasible for most applications. In this paper, we proposed a novel algorithm for computation of an n-D discrete wavelet transform (DWT) based on lifting scheme. In addition to benefits of lifting scheme (which causes a major reduction in computational complexity and performs the total computations in time domain), our real-time approach computes the coefficients for all kinds of 1st and 2 nd generation wavelets with short delay and optimized utilization of the slow and fast memories of a...
Spinodal liquid phase separation enabling dissimilar resistance spot welding of immiscible iron and copper alloy system
, Article Science and Technology of Welding and Joining ; Volume 28, Issue 2 , 2023 , Pages 98-107 ; 13621718 (ISSN) ; Pouranvari, M ; Sharif University of Technology
Taylor and Francis Ltd
2023
Abstract
The heat un-balance and the immiscibility of the Cu and Fe alloy system are the key challenges during Cu/Fe resistance spot welding. Utilising electrodes of different geometries enabled the formation of a mixed Cu–Fe fusion zone. It is identified that despite the immiscibility of Cu and Fe in the solid-state, metastable liquid phase separation enables a metallurgical joining between Cu and Fe. The liquid phase spinodal decomposition led to the formation of an ultra-fine interconnected network of Cu-rich and Fe-rich phases in the fusion zone. The higher hardness of the fusion zone compared to the base metals, the susceptibility to solidification cracking, and the electrode indentation in the...
Feyerabend’s Point of View on Scientific Progress
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
Feyarabend’s philosophy of science is against method and rule such that he believes that “anything goes”. However, he sometimes applies the term “progress”. Reviewing his publications shows that from his point of view, progress is qualitative and relative. So, unlike other philosophers of science Feyarabend ignores the clarification of the concept; subsequently, his applications of the term “progress” are somewhat ambiguous. However, by studying his philosophy, one may realize what should be done to achieve progress in any sense. The affirmative aspect of Feyerabend’s philosophy, while highlights the social and ethical elements, considering his humanitarian outlook as well as his special...
On Feenberg’s Alternative Thinking About Virtual Space Technologies
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
Cultural and social problems in the modern age have motivated many thinkers to analyze modernity. Some of them have tried to solve these problems and, if possible, prevent their occurrence in the future. Proposed solutions are mostly dystopian, i.e. by being disappointed, they think the only possible way to overcome these problems is to annihilate modern civilization, or they pursue a passive approach; i.e. they have accepted the problems of modernity but only seek a way to mitigate its challenges. Among these, solutions which try to make use of the capacities of the modern civilization, especially emerging technologies, are really scarce. These approaches seek to realize (and make...
APIS’ Evolution Comprehension Via Analyzing the Q&As in the Stack Overflow Website
, M.Sc. Thesis Sharif University of Technology ; Heydarnoori, Abbas (Supervisor)
Abstract
Client applications are often developed with the help of software frameworks in order to reduce the development costs and to increase the software quality. However, frameworks may evolve to add new features or to fix bugs, and thus, their APIs may change at the same time. Nevertheless, these API changes can cause the client applications to not work properly. New frameworks typically use the deprecation mechanism to reduce this effect, but their documents often do not provide sufficient information. Consequently, deprecated APIs usages remain unresolved in client applications. To tackle this issue, we introduce ARFES (Automated Recommender of Framework Evolution Solutions) that provides...
Has "The Work and Technology Course" in the Elementary School and Guidance School Paid Enough Attention to Improve Technological Thinking?
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
It has been five years since the new education system was started, according to which fundamental changes have been applied to school text books. The mentioned changes in the text books are based on “the fundamental transformation document” and “Iran’s national educational curriculum”. In “Iran’s national educational curriculum”, eleven fields concerning pedagogy and learning are explicitly mentioned; one of these eleven fields is “training and learning work and technology”. One of the merits which has been stressed in this field, is “technological thinking”. Nowadays, methods of extending and reinforcing the technological thinking have come to be the subject of investigations in many...
The concept of Social Ethics and Its Relation to the Politics from Hobbes Point of View
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
In this thesis, I study the concept of social ethics from a modern point of view. What I call modernity, is the fundamental philosophical revolution happened in the sixteenth and seventeenth centuries in Europe, this period is called “Enlightenment”, what I assume is from Machiavelli to Kant. One of the most important philosophers belongs to this enlightenment period is Thomas Hobbes, a Scottish philosopher whose main book “Leviathan” is well-known as the basis of the modern politics. Modern politics makes sense against classical one, founded by Aristotle in a book mentioned under the same title. What Hobbes describes as society based on public interests etc. is in a different point of view...
Religious Science: Comparison of Golshani's and Javadi Amoli's Views
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
Religious science, its nature, possibility, and the mechanism of achievement have come to the fore in recent years. In this thesis, Javadi Amoli’s and Golshani’s theories are compared in this respect. Javadi Amoli begins by situating the reason, and certain knowledge as its product, in the architecture of religious knowledge. Since this kind of knowledge unveils divine action, Amoli counts it as already divine in nature. Therefore, there would be no conflict between science and religion in principle, unless atheist scientists insist on drawing non-empirical conclusions from sciences. Other conflicts too are superficial and resolvable. Amoli sees the fault of current sciences, which should be...
Solving the P-Center Problem under Uncertainty
, M.Sc. Thesis Sharif University of Technology ; Shavandi, Hassan (Supervisor)
Abstract
Facility location decisions play a prominent role in strategic planning of many firms, companies and governmental organizations. Since in many real-world facility location problems, the data are subject to uncertainty, in this thesis, we consider the P-center problem under uncertainty of demand nodes. Using Bertsimas and Sim approach, we modeled the problem as a linear optimization model. Furthermore, we develop a tabu search algorithm to solve the problem. Finally we designed some experiments to adjust the parameters of tabu search algorithm. We presented the numerical result accordingly
Explaining the Concept of Civilization by using Theory of Constructive Perceptions with Emphasis on Knowledge and Technology as Components of Civilization
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
The purpose of writing this thesis is to arrive at the concept of civilization. And in this process, using the constructive perception. My approach in constructive perception is different with approach of Allameh tabatabaei in constructive perception. In first chapter defining constructive perception as the perception that mind by analogy between two consepts makes the non-real relations and attributes it deliberated to the reality (the parties). Meanwhile, should have been constructive perception is the intermediary that stimulation our sense abut reality. These feelings can be tenderness or hatred or fear and hope and ... . In the second chapter we will show that the use of technology...
Welding Metallurgy and Welding Feasibility of Low-Carbon Steel and Pure Copper in Resistance Spot Welding Process
, M.Sc. Thesis Sharif University of Technology ; Pouranvari, Majid (Supervisor)
Abstract
With the expansion of industry, steel to copper joints applications in heat and electricity transmission equipment have increased. Steel has better mechanical properties and weldability and lower prices, and copper has better thermal and electrical conductivity properties; because of that, this dissimilar joint fits needs such as cost reduction and high efficiency. This study has parametrically investigated the feasibility of dissimilar welding of these metals using the resistance spot welding process.This study conducts three phases. In the first phase, low carbon steel and copper were directly welded, and it was found that the mechanical properties of the joint were affected by physical...
The Study of the Steric and Electronic Effects on n → π* Interactions in a Series of New Rhenium (I)Tricarbonyl Complexes
, Ph.D. Dissertation Sharif University of Technology ; Kia, Reza (Supervisor)
Abstract
In this research, synthesis, structural and theoretical studies of new rhenium (I) tricarbonyl complexes with general formula, [Re(CO)3(NN)X] in which NN´ is chelating bidentate diimine ligand and X = Perrhenate, NO2 and ONO ligands were studied. The synthesized complexes were characterized by 1H-NMR, FT-IR and ESI-mass spectroscopic methods and their solid state structures were determined by X-ray diffraction analysis. Crystal structure determination by single-crystal X-ray diffraction allows us to fully examine the intramolecular and intermolecular interactions. The energy of different n → π* interactions also was investigated. Since three carbonyl groups are present in these complexes, we...
Electronic and transport properties of monolayer graphene defected by one and two carbon ad-dimers
, Article Applied Physics A: Materials Science and Processing ; Vol. 116, issue. 4 , 2014 , p. 2057-2063 ; Moravvej-Farshi, M. K ; Faez, R ; Sharif University of Technology
2014
Abstract
Using density functional theory combined with non-equilibrium Green's function method, we have investigated the electronic and transport properties of graphenes defected by one and two carbon ad-dimers (CADs), placed parallel to the graphene lattice. Addition of these CADs to graphenes creates 3D paired pentagon-heptagon defects (3D-PPHDs). The band structure, density of states (DOS), quantum conductance, projected DOS, as well as the current-voltage characteristic per graphene super-cells containing each type of 3D-PPHD are calculated. The local strain introduced to graphene by 3D-PPHDs forces the C-bonds in the dimers to hybridize in sp 3-like rather than sp 2-like orbitals, creating...
Role of 3D-paired pentagon-heptagon defects in electronic and transport properties of zigzag graphene nanoribbons
, Article Applied Physics A: Materials Science and Processing ; Volume 116, Issue 1 , July , 2014 , Pages 295-301 ; ISSN: 09478396 ; Moravvej Farshi, M. K ; Faez, R ; Sharif University of Technology
2014
Abstract
Electronic and transport properties of 11 zigzag graphene nanoribbons (11-z-GNRs) with two types of 3D-paired pentagon-heptagon defects (3D-PPHDs) are studied using density functional theory combined with non-equilibrium Green's function method. The C ad-dimers that have been introduced to z-GNRs to form these 3D-PPHDs have induced local strains forcing the C-bonds in the ad-dimers to hybridize in sp3-like rather than sp2-like orbitals. Such transformations that cause extra electrons to accumulate around the 3D-PPHDs are responsible for the variations in the electronic and transport properties of the defected z-GNRs. Density of states (DOS) for 11-z-GNRs containing either type of 3D-PPHDs,...
Evaluation of efficiency in zinc recovery from waste materials
, Article 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium, San Diego, CA, 27 August 2006 through 31 August 2006 ; Volume 1 , 2006 , Pages 445-452 ; 0873396332 (ISBN); 9780873396332 (ISBN) ; Halali, M ; Sharif University of Technology
2006
Abstract
In this report, the efficacy of different factors such as temperature of reaction, time of reaction and depth of bed are investigated in a process of recovery of zinc oxide from zinc ore concentration residues in a fluidized bed furnace. Under optimum conditions, there was more than 93.5% zinc oxide in products
Studies on recycling of zinc-containing waste
, Article REWAS'04 - Global Symposium on Recycling, Waste Treatment and Clean Technology, Madrid, 26 September 2004 through 29 September 2004 ; 2005 , Pages 2797-2799 ; 8495520060 (ISBN) ; Halali, M ; Sharif University of Technology
2005
Abstract
In this report, the possibility of recovering zinc oxide from zinc containing wastes, also the effect of temperature, time and depth of bed on recycling has been studied. Zinc oxide with a purity of 93.5% was obtained
Iterative multiuser receiver for coded MC-FH multiple access systems in the presence of partial-band interference
, Article 2004 IEEE 60th Vehicular Technology Conference, VTC2004-Fall: Wireless Technologies for Global Security, Los Angeles, CA, 26 September 2004 through 29 September 2004 ; Volume 60, Issue 3 , 2004 , Pages 1899-1903 ; 15502252 (ISSN) ; Nasiri Kenari, M ; Sharif University of Technology
2004
Abstract
In this paper, we consider an iterative multiuser receiver for the coded MC-FH system, first introduced in [4], in the presence of partial-band interference. The structure of the receiver consists of two principal parts: multiuser soft input soft output (SISO) detector and SISO channel decoder. When the channel is under the attack of jamming, for optimum detection we propose to add a jamming estimator to multiuser SISO detector. So, the new SISO multiuser detector consists of multiuser likelihood calculator (MULC) and iterative jamming estimator (JE). The numerical results show that the proposed receiver works quite well compared to the ideal receiver which has the perfect channel state...
Examination and Critique of Susan George’s Ideas Concerning the Relation of Religion and Technology
, M.Sc. Thesis Sharif University of Technology ; Taghavi, Mostafa (Supervisor)
Abstract
This article investigate about Susan George’s ideas concerning the relation of religion and technology and examine her point of view. George, searches synergy between religion and technology and tries to develop basis of artificial intelligence by religion. She provide answers to some philosophical concerns about technology through religion and tries to prove that technological morality needs religion. We show that some of her Assumptions is not through her conclusions. George, notices to the help of technology to religion for providing a new expression. We examine her clams about relation between technology and Islam