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    An Investigation on the Effect of Design Parameters on Behabior of Prestressed Ring-Shaped Steel Structures

    , M.Sc. Thesis Sharif University of Technology Dabaghian Torghabeh, Jamal (Author) ; Esmaeil Purestekanchi, Homayoon (Supervisor)
    Abstract
    A tensile-compression ring is derived from the spoke wheel principle. The wheel is one of the greatest inventions in mankind. The use of the wheel has developed through time. Engineers found out that the use of the spoke wheel as a roof structure provides many benefits. With the spoke wheel principle a lightweight, cost-efficient roof structure can be made. In recent years the spoke wheel principle has also been applied for oval shaped roofs in order to increase the application of the principle. An example is the use of the roof structure for football stadia. The problem is that the spoke wheel principle will only work at full extend when its shape is completely circular. The question rises... 

    Design and Modeling of an Improved Passive Viscous Damper Based on the Reduction of the Effects of Brace Flexibility

    , M.Sc. Thesis Sharif University of Technology Kheyri Torghabeh, Farid (Author) ; Ahmadizadeh, Mehdi (Supervisor)
    Abstract
    By comparing the control systems, researcherstypically believe that the active systems of control have better performance than passive ones. However, the high costs and the required technology for their erection and maintenance have limited the use of active control systems. In order to improve the control system performance at lower costs, semi-active control systems were also considered. Their performance is based on creating the desired control force by changing the instrument characteristics.Moreover, recent researches have shown that the improved performance of these instruments in structures compared to passive control systems, are typically due to reducing the flexibility of the... 

    Investigating dynamic response of a buried pipeline in sandy soil layer by 1G shaking table test

    , Article International Journal of Civil Engineering ; Volume 8, Issue 2 , 2010 , Pages 107-124 ; 17350522 (ISSN) Jafarzadeh, F ; Farahi Jahromi, H ; Abazari Torghabeh, E ; Sharif University of Technology
    2010
    Abstract
    Investigating the parameters influencing the behavior of buried pipelines under dynamic loading is of great importance. In this study the soil structure interaction of the pipelines with the surrounding soil was addressed using shaking table tests. Wave propagation along the soil layers was also included in the study. The semi infinite nature of the field was simulated using a laminar shear box. The soil used in the experiments was Babolsar coastal sand (Iran). PVC pipes were used due to their analogy with the field. Eight models were constructed with the first four models having uniform base. In the next models, the non-uniformities of real ground were simulated using a concrete pedestal... 

    Multi-Query Optimization in Distributed Databases Using an Ants Colony-Based Algorithm

    , M.Sc. Thesis Sharif University of Technology Abazari Torghabeh, Reza (Author) ; Mirian Hosseinabadi, Hassan (Supervisor)
    Abstract
    One important problem in query optimization in centralized and decentralized databases is optimizing queries containing common sub-expressions, known as multi-query optimization. In processing these queries, the goal is to process a group of queries together and find a global execution plan with minimum cost for the query set. In most of researches which have approached this problem the focus were on exhaustive algorithms. Since size of the problem space for these algorithms grows exponential with query set size, these approaches are impractical. In this research we have presented six algorithms based on Ant Colony Optimization metaheuristic. We have compared the efficiency of these methods... 

    Management of Different Levels of Frequency Control Reserve Ancillary Services

    , M.Sc. Thesis Sharif University of Technology Taghizadeh Torghabeh, Adel (Author) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
    Abstract
    In most countries Frequency control services as one of the Ancillary services are presented in market scheme. Frequency control are used in different levels to balance generation and demand. Each reserve levels is implemented with specific characteristics and rules. Clearance of energy and one control reserve has some drawbacks so in this thesis we try to clear energy and different reserve levels simultaneously. Each reserve level is determined with special criteria. This criterion in primary reserve is frequency deviation restriction and unit commitment risk in territory reserve that is determined by system operator. In this thesis these two criteria are formulated in linear form and... 

    Global Estimates of Manure and Synthetic Fertilizer Phosphorus Loss in Runoff and the Quantification of Data Uncertainities

    , M.Sc. Thesis Sharif University of Technology Golkar Torghabeh, Mohammad Kian (Author) ; Sheikholeslami, Razi (Supervisor)
    Abstract
    The increasing rate of population and agricultural development over the past few decades has led to a significant rise in the pollution of surface and groundwater. The application of animal and synthetic fertilizers containing phosphorus, which increases the levels of this element in the soil, can be considered one of the factors endangering the environment, especially the quality of surface waters. The transport of phosphorus, which is one of the pollutants in agricultural runoff, can lead to the degradation of aquatic ecosystems and reduce the quality and usability of water resources. Accordingly, various numerical models have been developed to simulate phosphorus loss from the soil. They... 

    Appropriate Methods of River Quality Restoration

    , M.Sc. Thesis Sharif University of Technology Ikani, Nima (Author) ; Hashemian, Jamal (Supervisor)
    Abstract
    The practice of river restoration has grown exponentially over the last several decades. There has been little empirical evaluation of whether restoration projects individually or cumulatively achieve the legally mandated goals of improving the structure and function of rivers. Nutrient reduction through simple methods is the most critical factor. The simplest method, which has minimal financial burden as well as preventing, and reducing the entrance of pollutants into the Chalus River (Mazandaran, in north of Iran), has been selected. The origins of rivers start at a high point and move with a steep. ... 

    Optimal Allocation of the Injection Gas for Gas Lift in one of the Oil Field by using Algorithms

    , M.Sc. Thesis Sharif University of Technology Afsharian Torghabeh, Masoud (Author) ; Masihi, Mohsen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    At the early stages of production, oil reservoirs may have enough energy to push the oil from the reservoir into the wellbore and subsequently from the wellbore to the surface. 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, using some kind of artificial lift method to provide the energy to bring the fluid to the surface, seems to be necessary. Continuous flow gas lift is one of the most common artificial lift methods widely used in the oil industry during which, at appropriate pressure, gas is injected in a suitable depth into the tubing to gasify the oil column, and thus assist the production. Each... 

    Electrochemical Deposition of Co-Mn LDH/Ni-Co-S as an Electrocatalyst for Electrochemical Water Splitting Reactions

    , M.Sc. Thesis Sharif University of Technology Askarzadeh Torghabeh, Mostafa (Author) ; Ghorbani, Mohammad (Supervisor) ; Barati Darband, Ghasem (Co-Supervisor)
    Abstract
    The development of alternative energy sources is a prominent area of scientific research. Hydrogen, with its exceptional energy density, has emerged as a particularly promising candidate among these new energy sources. An effective technique for generating hydrogen is through the electrochemical process of water splitting. To enhance this process, it is crucial to investigate the development of electrocatalysts with high electrocatalytic activity. Among the potential options, sulfides of transition metals show promise. An essential difficulty in electrochemical water splitting is the development of a bifunctional catalyst that is both active and stable for both the hydrogen evolution... 

    Analysis and Optimization of a Two-stage Light Gas Launcher for Shock Consolidation Process

    , M.Sc. Thesis Sharif University of Technology Mohammadi, Mohsen (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Powder metallurgy is one of the most important and most usable methods in industries. Nowadays, many of the specimens are made this way. In this method, after powder compaction stage, because of sintering in high temperature, crystallographical structure of the material changes. This change results in poorer strength than initial powde. In order to avoid change and decrease in powder strength, shock consolidation is used. In this research, because of complication of this phenomenon and final quality of the specimen, shock consolidation of metal powders is investigated and analysed. This phenomenon is modeled, simulated, analysed and optimized mathematically.Various methods are used to create... 

    Assessment of Water and Sewage Facilities of Kish Island and Offering Solutions in Emergency Conditions (A Case Study on Kish Island)

    , M.Sc. Thesis Sharif University of Technology Mojtahedi, Amir (Author) ; Hashemian, Jamal (Supervisor)
    Abstract
    Vulnerability of water and sewage infrastructure in Kish Island survey versus natural and unnatural threats. It is important to know what to do when crisis or unpredicted event occurs in the Island. Decision makers and master managers of the Island, as the main custodians make suitable and effective reactions and decisions so that the impact of threats is reduced to minimum. According to the threats, there are short term and long term solutions. These solutions can be applied when the Island is encountered with crisis  

    Investigating the Reduction of Sewage Sludge Volume in Kish slandRefineries with the Help of Mud Eating Worms

    , M.Sc. Thesis Sharif University of Technology Heidari, Moosa (Author) ; Hashemian, Jamal (Supervisor)
    Abstract
    A major environmental challenge for wastewater treatment in Iran and other countries is the disposal of excess sludge produced during the biological process. This project has been developing and testing a technology that will help to overcome this challenge in Kish Island wastewater plant. Results demonstrate it can perform highly effective treatment of municipal wastewater while producing low levels of sludge.Applicationofvermifiltrationfor treatment of wastewater sludge using the Eiseniafetida earthworm species. The earthworms’ gut acted as a biofilter whereby there was reduction in the sewage wastewater’s solid and liquid organic and inorganic wastes through ingestion and expelling these... 

    The investigation of Odor Producing Factors in Kish Island Refineries and Sewage Collection System

    , M.Sc. Thesis Sharif University of Technology Jamali, Hamid Reza (Author) ; Hashemian, Jamal (Supervisor)
    Abstract
    From the main factors causing an unpleasant odor can refer to indoles, askatels, mercaptans, some volatile organic compounds, sulfide hydrogen, ammonia, and the number of odor-causing compounds, which are also found in the wastewater facilities and sometimes produce unpleasant odors. Meanwhile, ammonia (Pungent and irritating odor) and sulfide hydrogen (colorless poisonous gas with the odor of rotten eggs) can be presented as major factors in sewage odor.
    Several factors are involved in the foul-smelling hydrogen sulfide gas collection system and wastewater treatment. A few of them include numerous sewage pumping stations, selected the appropriate gradient in the collection system,... 

    Synthesis and Investigation of Tribological Properties of Rubber-Based Friction Materials with low Friction Coefficient

    , M.Sc. Thesis Sharif University of Technology Jamal Anaraki, Maryam (Author) ; Shojaei, Akbar (Supervisor)
    Abstract
    Nowadays, replacement of traditional cast iron shoes with composite brake blocks is a main project in railway systems. The main purpose of this replacement is noise reduction( for example by about 10dB for a 100km/h freight train). One of the main sources of noise emission is the rolling sound of the wheel on the rail. The rougher and more out-of-round wheel surface, the greater the noise produced. Cast iron brake shoes, still widely used on freight wagons, make the wheel surface much rougher than composite brake blocks due to the fusing of minute metal particles into the tread surface during braking. It is therefore necessary to replace the current cast iron brake shoe with a synthetic... 

    Design, Analysis and Prototyping of Cylindrical Electropump with Radial Space Limit

    , M.Sc. Thesis Sharif University of Technology Modarressi, Vala (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Inflatable packers are a class of downhole equipments that are used for oilwell pluging operations. To set the packer inside the well, it is necessary to apply hydraulic pressure to it. By using the setting tool and installing an electropump in it, it is possible to transfer the fluid into the packer and supply the required pressure. In this research, an electropump has been designed and built that, firstly, is dimensionally suitable for the conditions of oil wells and, secondly, can have a good performance in the environmental conditions inside the well. This electropump, which can be used in a 2.125-inch setting tool, consists of a brushless direct current motor and a piston pump. To test... 

    Traffic Data Modelling with Gaussian Processes

    , M.Sc. Thesis Sharif University of Technology Jamal Bafrani, Fateme (Author) ; Gholampour, Iman (Supervisor)
    Abstract
    In the transportation industry, one of the most important and fundamental problems is the traffic of vehicles in the transportation roads. This problem is especially seen in large and densely populated cities such as Tehran. If traffic control is not done properly, it can lead to problems such as reduced traffic dynamics, environmental pollution, wasted drivers' time, disorder and loss of energy. If the traffic control is done after creating a traffic problem, it will not bring good results and will have low efficiency. For this reason, optimal traffic management and control has been raised as an important issue, especially in large cities. Predicting traffic flow is one of the important and... 

    Numerical Investigation of Geometrical and Material Parameters Effect on Inflation and Deflation of oil well Inflatable Packers

    , M.Sc. Thesis Sharif University of Technology Eftekhari, Ahmad (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Inflatable packers have a great value in downhole operations due to their unique ability to expand to several times their initial diameter. These type of packers have a sealing element. This element is constructed of thin overlapped sheet metal ribs which are surrounding an inner tube. These overlapped ribs protect inner tube against the extrusion. The outer surface of this element covered by a layer of rubber. The outer elastomeric cover seals the annulus of the casing and isolates the zones in the well. In this study, some of the geometrical and material parameters effects on inflation and deflation of inflatable packers are investigated by numerical method. At first, for this purpose, the... 

    Investigation into the Effect of Material and Geometrical Parameters on Mechanical Behavior of Medical Guidewire

    , M.Sc. Thesis Sharif University of Technology Heidary, Mahdi (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Today, tens of millions of people on the planet suffer from heart disease. For the correct diagnosis and treatment of these diseases, there is a vital need for accurate scientific evidence such as various types of vascular and cardiac imaging. One of the applications of guidewires is in cardiovascular imaging. Of course, in addition to diagnosis, this device is also used in the treatment of disease. It should be noted that about 21 million central vessel catheters are performed annually on heart patients, of which about 16 million are performed using the seldinger method. Reportedly, unfortunately, 5% to 19% of these operations have had side effects and harm to the patient or failure.... 

    Simulation and Investigation of Mechanical Behavior of Non Pneumutic Tires

    , M.Sc. Thesis Sharif University of Technology Dana, Amir (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Due to the relatively high freedom of selection of materials associated with a simple manufacturing method, a nonpneumatic tire (NPT) can be manufactured with low viscoelastic energy loss material. NPTs consisting of flexible spokes and the shear band are still at an early stage of research and development. An optimization study of NPTs’ geometry needs to be conducted, which is the objective of this thesis. Parametric studies and design of experiments (DOE) of an NPT are conducted with a hyper-viscoelastic finite element (FE) model to determine the effects of four design variables on rolling resistance, contact pressure and vertical deflection. Considering vehicle load carrying capacity and... 

    Design, Construction and Experimental Study of Effect of a Pressure Intensifier Device on a Small Scale Reverse Osmosis System

    , M.Sc. Thesis Sharif University of Technology Bolhassani, Mohammad (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Abstract
    Nowadays, water and energy shortage is the main concern of many industries. Every saving that could be done is valuable. In the first step of this project, energy recovery devices that are used in reverse osmosis systems, are reviewed and advantages and disadvantages of each system are investigated. These apparatuses save energy by recovering high-pressure energy from leaving brine and reduce the energy consumption of the device. The main focus of this study is energy consumption of the device that is used for desalination of seawater in reverse osmosis systems and on this basis, different energy recovery devices are compared. According to the investigation, results showed that most of the...