Sharif Digital Repository

In recent years, there are continuous researches on replacing new dielectrics with suitable dielectric properties (including high dielectric coefficient, low loss factor, high breakdown voltage, and high nonlinear coefficient simultaneously). One of these new materials is co-doped titanium oxide with donor and acceptor of electron, which in spite of having high dielectric coefficient and low loss factor. it has low breakdown voltage and researches on improving the disadvantages of this dielectric are ongoing. Due to the structural similarities between tin oxide and titanium oxide, the tin oxide can be an interesting system for studying and improving disadvantages in this field. In this study... 

There is a growing demand for efficient treatment plans which can deal with high loading of organic pollutant, considering the population growth in communities. Our country is going toward industrialization; hence, it requires more effective and efficient treatment plans as well as innovative ones. Moving Bed Biological Reactors are accounted amongst appropriate methods in removing various pollutant which has been used in recent decades. In regard to increasing demand for new treatment plans, one of the options can be upgrading of existing activated sludge systems. Two bioreactors with 10 liter volume each in parallel lines were used in this work. One of them was a regular MBBR as a blank... 

Ship maneuverability is so important from different aspects. According to the regulations of International Maritime Organization (IMO), every vessel has to meet the minimum requirements of mentioned rules. Consequently, prediction of ship maneuverability in early stages of ship design has become to one of the most necessary steps for shipbuilding and design companies. There are a variety of options in order to prediction of maneuverability of vessels, for instance, one important way is Free running model tests which is capable of direct calculation of the required parameters, provided if some certain conditions are met. In this work, firstly, an introduction to the importance of vessel... 

Navigation in various systems for land, air and sea movement has been of special importance for a long time. Determining the location, direction, speed and acceleration of moving has been a vital issue for mankind and it is also a basic prerequisite for starting the control process. Various methods have been used for this problem, the most important of which is the global positioning system. This method is satellite-based and any user from any part of the world can perform positioning. But in some places, such as tunnels or crowded places in the city, where it is not possible to send a signal, other methods are used. Also, in order to reduce errors, we can use the inertial navigation system... 

Advancements in solar powered systems bring about the possibility for today’s transportation systems to be operated and driven by such a clean and renewable source of energy. The challenging point of this combination is to draw high power levels from such a low power density source of energy. As a result, employing an efficient power storage and management system becomes inventible. The subjects of this research are to design a grid connected system and evaluate its performance and feasibility in a real application (Tehran- Mehrshahr surface train – Tehran 5th Metro Line). The task includes sixteen pairs of DC transmission lines which are powered by CIGS solar module technology and four... 

In this thesis, performance bounds for the optimal control of discrete-time LTI plants are proposed. Results of stable plants with relative degree but no finite nonminimum-phase zero that have been done in the literature, are reported. According to model-matching problem and Nehari’s Theorem for finding performance bound in discrete-time, an algorithm in seven steps is posed. Meanwhile by using of presented algorithm, a case of nonminimum phase stable plants and several cases of unstable plants for finding performance bound is studied. By using of Matlab, A program for performance bound in plants with no poles Nor zeros on the unit circle is presented.

 

According to current trend of energy production and consumption in the world, economic problems in various countries and too many eco-system disorders in which created by an unsustainable trend in development, recently, the concept of “sustainability” and in the following “sustainable development” has been featured by scientists, researchers and policy makers in different scientific disciplines specially energy system engineering. Therefore exact recognition of unsustainability of local and global energy supply and demand system is very essential. In this research after selection of five energy indicators for sustainable development by Delphi and MCDM methods, future perspective of Iranian... 

The transportation sector is the largest oil consumer sector in the world. Iran is no exception to this, and the transportation sector, especially road transport, has a large share of oil and energy consumption in Iran. Diesel supply security in The road transport system has been implemented but it has not been properly managed for gasoline, as the country has been an importer of gasoline for many years and large cities suffering the pollution caused by light duty vehicles. Analyze the transportion of light duty vehicle by the game theory method can detect the barriers to reducing fuel consumption. For this purpose, the main Actors affecting the transport of light duty vehicles - people,... 

Fillet welds are widely used in steel construction due to their high strength and economy. In the joints used in construction, eccentricity loads in complex weld stress. The current research involves 72 bending specimens and 16 torsion specimens being modeled to study different design code relationships regarding the plastic properties of welds. In line with an even comprehensive study, the previous experimental programs in this field have been added to the modeling results.Reliability analysis has been applied to examine code relationships more precisely. The analysis involved examination of various uncertainties which showed that applying elastic methods proves more conservative than other... 

Sanctions are one of the most important variables influencing Iran's domestic and international decision-making and have had many effects on Iran's economy and politics in recent years. Iran's ability to influence the oil market and harm the interests of the sanctioning countries in this market raises the question of whether such a capability could affect the outcome of sanctions and lead to the withdrawal of those sanctioning countries. A theoretical examination of the issue of sanctions using game theory shows that if the sanctioned country is not able to retaliate in areas other than the disputed issue, the sanctions game may not reach an equilibrium in which the sanctions are lifted but... 

The Iran-China 25-year Cooperation Program on the further economic development particularly energy area signed on 27 March 2021 by Iran, which suffered from many years of political and economic isolation and China, the second global economy. Energy transition is an essential issue in both country's energy systems which calls for a medium energy carrier that will be the natural gas. China is seeking for new natural gas resources in order to achieve its ambitious net-zero goals and Iran has targeted 50% reduction in its energy intensity. The necessity of supplying the natural gas for Pakistan and China through the CPEC (China-Pakistan Economic Corridor) by Iran is an important criterion in the...