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behdarvandan--nazanin
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Investigation into Circular Steel Tubes with Pitting Corrosion under Axial Compression and Bending Moment
, M.Sc. Thesis Sharif University of Technology ; Moazezi Mehretehran, Alireza (Supervisor)
Abstract
In this research the behavior of Circular Steel Tubes (CSTs) with corrosion under axial force and bending have been studied. There are several factors leading to corrosion in steel structures, especially marine structures that results in strength reduction of whole structure. Steel tubes are widely used in construction of on-shore and off-shore structures such as, oil rigs and platforms, oil and gas transmission lines. Current study focus on strength reduction of steel tubes with “pitting corrosion”. To this end numerical analyses using finite element software, Abaqus, have been performed. Therefore, utilizing verified models, the simultaneous effect of bending, axial load and corrosion on...
Investigation and Study of Microstructure, Dielectric and Non-ohmic Properties of tin and Cobalt Oxide Systems Co-Doped with Electron Donor and Acceptor Elements
, M.Sc. Thesis Sharif University of Technology ; Nemati, Ali (Supervisor) ; Maleki Shahraki, Mohammad (Supervisor)
Abstract
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...