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...

Multivariable control of transmitted vibrations to the seat model of the human body

, Article International Journal of Industrial Ergonomics ; Volume 56 , 2016 , Pages 69-83 ; 01698141 (ISSN) Askarzadeh, Z ; Moradi, H ; Sharif University of Technology

Elsevier 2016

Abstract

Advanced control techniques are required for the vibrations suppression of the seated human body in different places like automotive and public transportation lines. In this paper, an active multivariable control strategy is applied to a seated human body model and results are simulated and examined via MATLAB. Dynamic equations of the model are derived using Lagrange method and they are linearized around the equilibrium point of the system. After assessing the deficiencies of the previous models and control strategies proposed for the human body, an active control method is presented based on pole placement analysis. This control strategy is designed for a realistic model of the human body...

Simulation of Trench Effect on Fatigue life of SCR near Touch Down Zone

, M.Sc. Thesis Sharif University of Technology Askarzadeh, Alireza (Author) ; Raie, Mohammad (Supervisor)

Abstract

Gas and oil reservoirs on Caspian Sea made Engineers to choose suitable riser for conveying oil and gas. Steel catenary riser is one of the best choices for deep and ultra-deep water. Although these kinds of risers show very good resistance on buckling but cyclic loads made them to fail by fatigue damage. Two sensitive points regarding to fatigue damage are Hang off point and touch down point. Fatigue damage on TDP is related to soil properties. Because of the cyclic movement of the riser a trench would shape on seabed. In this research, based on Finite element analysis, the effect of trench on fatigue life of SCR would be analyzed

Computational Design of a Novel Inhibitor based on Natural Biomolecules for Heat Shock Protein 90 (HSP90)

, M.Sc. Thesis Sharif University of Technology Bavafa Torghabeh, Alireza (Author) ; Fattahi, Alireza (Supervisor)

Abstract

In this study, the primary focus was on designing a novel drug scaffold aimed at inhibiting the HSP90 enzyme—an enzyme that, unlike many others, is intrinsically active and does not require upstream regulators for its function. This characteristic has made HSP90 a crucial therapeutic target in the treatment of various cancers and certain viral diseases. Recent studies have shown that the overactivity of this enzyme contributes to signaling pathways involved in cell proliferation, survival, and migration, and that its inhibition can arrest the growth of cancer cells.
To develop an effective compound for the specific inhibition of HSP90’s active site, a thorough examination of...

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...

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...

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...

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...

Periodic solutions for a semi-ratio-dependent predator-prey dynamical system with a class of functional responses on time scales

, Article Discrete and Continuous Dynamical Systems - Series B ; Volume 9, Issue 2 , 2008 , Pages 267-279 ; 15313492 (ISSN) Mostafa, F ; Hesaaraki, M ; Sharif University of Technology

2008

Abstract

In this paper we explore the existence of periodic solutions of a nonautonomous semi-ratio-dependent predator-prey dynamical system with functional responses on time scales. To illustrate the utility of this work, we should mention that, in our results this system with a large class of monotone functional responses, always has at least one periodic solution. For instance, this system with some celebrated functional responses such as Holling type-II (or Michaelis-Menten), Holling type-III, Ivlev, mx (Holling type I), sigmoidal [e.g., Real and mx2/((A + x)(B +x))] and some other monotone functions, has always at least one ω-periodic solution. Besides, for some well-known functional responses...

Modified Load Scheduling Using Smart Meters

, M.Sc. Thesis Sharif University of Technology Bahrami, Shahab (Author) ; Parniani, Mostafa (Supervisor)

Abstract

Implementation of various incentive-based demand response strategies has great potential to decrease peak load growth and customer electricity bill cost. Using advanced metering and automatic demand management makes it possible to optimize energy consumption, to reduce grid loss, and to release generation capacities for the sake of providing sustainable electricity supply, and reducing electricity bills for the customers. With these objectives, this thesis examines the previously suggested load scheduling programs in both residential and industrial sectors, and proposes new practical strategies for load management. This thesis has mainly focuses on three subdivisions of load management...

The Analysis of Total Productive Maintenance Based on Computerized Maintenance Management System

, M.Sc. Thesis Sharif University of Technology Behshad, Amir (Author) ; mostafavi, mostafa (Supervisor)

Abstract

The main purpose of this thesis is to analyze the total productive maintenance based on computerized maintenance management system. At first, a detailed study on total productive maintenance is performed and then the requirements of this maintenance strategy are specified. Also, a computerized maintenance management system is defined which can help total productive maintenance to reach to its requirements. Finally, a conceptual model and entity-relationship model for computerized maintenance management system data base has been created

Study of HVDC Transmission for Offshore Wind Farms Based on Voltage Source Converters

, M.Sc. Thesis Sharif University of Technology Safaeian, Reza (Author) ; Parniani, Mostafa (Supervisor)

Abstract

In this thesis, DC transmission of offshore wind farms is studied thoroughly. Various system configurations that are introduced in the literatures are discussed and their control scheme for normal conditions and grid faults are studied. Then, the HVDC transmission based on voltage source converter, located between a local offshore ac grid and the onshore ac system is investigated as the most practical choice. The HVDC linke circuit elements are calculated and the control strategies of the offshore and onshore converters are introduced. DFIGs are considered to be the best choice for the offshore wind turbine generators. Then, the system is simulated and the frequency of the offshore grid is...

Feasibility Study of Producing Active Pharmaceutical Ingredient from Conceptual Process to Mass Production-Case Study

, M.Sc. Thesis Sharif University of Technology Tavakoli, Meysam (Author) ; Mostafavi, Mostafa (Supervisor)

Abstract

The main aim of this thesis is to develop the technical knowledge of designing and making active ingredients of domestically produced drugs, decreasing the costs, independency in producing these products, and checking outflow of currency. It also aims to reduce the financial challenges of patients who have to pay huge amounts for such drugs. Conducting research in the field of reverse engineering and using its definition, and attempt in made to get knowledge into the stages of product development process, to determine the technical standards associated with each stage, to recognize how knowledge is shared during this process, and to present some methods of establishing the infrastructure...

Performance Improvement of Maximum Power Point Tracker in Grid-Connected Photovoltaic Systems

, M.Sc. Thesis Sharif University of Technology Mohammadian, Hossein (Author) ; Parniani, Mostafa (Supervisor)

Abstract

Increase in growing concerns over environmental pollution and depletion of fossil fuel resources motivate the need for cleaner energy technologies and stimulate research in facilitating renewable energy systems. In recent years, photovoltaic systems have attracted great attention since they remove the need for energy storage systems and intermediate processess for energy conversion. However, high capital cost, low efficiency and low energy density per area of these systems, as compared with other technologies hinder its industrial use. To surmount these bottlenecks and improve technical performance of PV systems, it is crucial to optimize configuration of convertor connection and to improve...

Coordinated Voltage Control of Power Systems in Normal and Emergency Operation States

, Ph.D. Dissertation Sharif University of Technology Rabiee, Abbas (Author) ; Parniani, Mostafa (Supervisor)

Abstract

One of the main objectives in operating a power system is to maintain the system voltage properly to avoid equipment damage and transfer power efficiently. Automatic control of transmission network voltage provides significant improvements in security, quality and efficiency of power system operation. This thesis investigates coordinated voltage control of power systems in normal, alert and emergency states. The aim is to propose a comprehensive framework for real-time operation of practical power systems, ensuring secure operation of the system in the normal state and after occurrence of sever contingencies.
At the first, a new coordinated voltage control scheme is proposed to ensure...

The Analysis of Knowledge Management, Dimensions and Implementation Methods-Case study: Sardsaz Khodro Ind. Co

, M.Sc. Thesis Sharif University of Technology Saghafian, Hamideh (Author) ; Mostafavi, Mostafa (Supervisor)

Abstract

Today, organizations are surrounded by basic and continuous changes such as declining organizational resources, reduction of the production cycles, and the need for rapid adaption. Those organizations remain competitive while maintaining their productivity, that have following characteristics: accurately plan and assess their knowledge resources, create and absorb beneficial knowledge, store and organize their knowledge, disseminate knowledge to needed areas, and use knowledge in practice and decision making, to improve their products/services as well as their performance. Therefore, the human capital has been considered as knowledge owners and the most important organizational resource, on...

Feyerabend’s Point of View on Scientific Progress

, M.Sc. Thesis Sharif University of Technology Yazdani, Homa (Author) ; 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...