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In this thesis existence and uniqueness of limit cycles are shown for a resonant converter, by extending Poincaré-Bendixson theory to non-smooth vector fields. We discuss relevant control theory and the role of simulations.
The main objective in the research described in this thesis was to design and test the use of lean premixed combustion using combustion gas recirculation for gas fuelled Stirling engine combustors. A system using a flame-arrester type of flame-holder to stabilize the flame and an ejector system for the recirculation of combustion gas was designed and tested in the laboratory. The impact of changes
Allt sedan det amerikanska presidentvalet 2016 har det runt om i världen pågått en intensiv diskussion om utländska påverkansoperationer och hur och med vilken framgång främmande makter i det fördolda har sökt påverka demokratiska val, politisk opinion och politiska beslut i olika länder, däribland Sverige. Forskare, debattörer och politiker har särskilt framhållit att den nya informationsteknolog
Trädgårdsgatan is a warm and heartfelt depiction of a divided Helsingborg and Sweden in transition. The play depicts three generations of women and their arduous efforts to deal with every-day life with work, marriage and children in the 1970s, 2000s and 2020s. Almost 50 years separate them, but they are united in their longing for a simpler and better life.At the centre of the story is Birgitta,
The need, for health educational reasons, of obtaining a more adequate understanding of how people think and act in connection with questions of dental health and professional dental care has been emphasized. The present study examines the attitudes and conceptions of adult individuals regarding their own dental health, as well as measures they take to further it. The aim is to elucidate factors t
This doctoral dissertation presents a study of linear radio transmitters based on the combined analog locked loop universal modulator (CALLUM) approach. Linear architectures such as CALLUM are very attractive for power-efficient operations, since they have no fundamental limitations prohibiting a 100% efficiency for all envelope levels, without sacrificing the potential of a linear transmission. T
The aim of the thesis is to contribute to knowledge about experience and perceptions of reading that students at a school of education have, from early reading experiences in childhood, to the encounter with reading in context of their teacher training. The following overarching questions were asked: What aspects of narratives appear to be significant in the students’ reading trajectories? Which a
