Search for dissertations about: "modes"
Showing result 21 - 25 of 1544 swedish dissertations containing the word modes.
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21. Drift and Mirror Modes in Magnetized Plasmas
Abstract : Low frequency plasma instabilities driven by plasma inhomogeneity and velocity anisotropies are major candidates for the explanation of various phenomena observed in fusion and space plasmas. For low-β fusion plasma, the influence of plasma rotation and finite ion temperature on the structure and the type of toroidal drift eigenmodes in tokamaks is investigated rigorously, including the effects induced by the toroidal geometry such as the coupling mode, the radial variation of plasma rotation velocity and the magnetic shear. READ MORE
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22. Optimization Methods for Robust Control with Application to Resistive Wall Modes in Tokamaks
Abstract : In many research areas physical systems are described by mathematical models. We focus here on systems that are regulated by a controller, typically realized by software, whose design involves certain parameters. READ MORE
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23. Modelling optical systematics for current and next-generation CMB experiments : Facilitating the quest for primordial B-modes
Abstract : The polarization of the Cosmic Microwave Background (CMB) is at the centre of attention of the cosmological community, as the observable possibly offers a view of primordial gravitational waves. This effort faces two key challenges. READ MORE
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24. Architectural prototypes : modes of design development and architectural practice
Abstract : This licentiate thesis is design driven, partly based on case studies in the form of experimental design projects developed mainly within the research and design collective Krets. It constitutes the first half of a PhD project that studies new technologies and techniques within design processes and the production of architecture, especially in relation to collaborative models. READ MORE
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25. Online power transformer diagnostics using multiple modes of microwave radiation
Abstract : In the present thesis, we propose and investigate a new approach to diagnose the effects of the various degradation mechanisms, including thermal degradation at hot spots, winding deformations due to the mechanical forces from short circuit currents, partial discharges due to local electric field surges, and increased moisture levels in the cellulose insulation due to decomposition, that affect electric power transformers during their normal operation in an electric power grid.Although the proposed diagnostics method can in principle be used to detect various degradation mechanisms mentioned above, we focus in the present thesis on mechanical deformations of transformer winding structures. READ MORE