Filtyp
It is commonly believed that we live in a culture that is increasingly permeated by visual images. One category of images that we encounter everyday in different media, and that constitutes a large and growing part of media content, is advertisements. Advertisements also have a specific purpose and the images represent, make meaning of, and convey sentiments about phenomena. In this dissertation,
This doctoral thesis treats three issues in control engineering related to relay feedback and multivariable control systems. Linear systems with relay feedback is the first topic. Such systems are shown to exhibit several interesting behaviors. It is proved that there exist multiple fast relay switches if and only if the sign of the first non-vanishing Markov parameter of the linear system is pos
A major aim initially was to create a forum for reflective dialogue on the preschool professions and how it is experienced on a daily basis, so as to be able to investigate how members of the preschool staff construct their professional subject. The following are major questions that were posed: How do preschool staff members talk about themselves, their profession and their work? In what way does
The objective of this thesis is to study the application of ventilation in schools buildings. A number of studies of the application of different forms of ventilation are presented. The main part of the thesis focuses on window opening in a classroom. Analytical models for calculation of the air change caused by window airing are proposed. The models are intended to be a tool for designers and occ
Sierra Leone is a small country with rich mineral resources such as diamonds, bauxite, gold and iron ore. Other resources include fishing, forestry and fertile agricultural land, which enable people to farm without any sophisticated methods of mechanization. Nevertheless, with all its wealth in resources, the country is relatively poor and is one of the least developed countries in the Sub-Saharan
The modeling work developed in this thesis can be divided in two main areas of investigations: autoignition related to spark ignition engine and combustion and emissions formation in relation to diesel engines. A first version of a detailed kinetics engine simulation program, extended to handle full cycle calculations, was employed in order to demonstrate the strong effect that nitric oxide from
Diesel engine developers are facing major challenges when meeting future demands on NOx and particulate emissions. The exhausts after treatment systems are rapidly improving and the technologies available in a few years will be capable of cutting emission levels close to the demanded levels. However, in order to reach the low emissions required in a long-lasting, cost effective way, the potential
The effect of duration of ischaemia on final infarct size is well established in animal studies, but not fully evaluated in humans. Delayed contrast-enhanced magnetic resonance imaging (DE-MRI) can be used to distinguish between viable and non-viable myocardium and thus to quantify infarct size. We therefore used DE-MRI to investigate how duration of ischaemia affects final infarct size normalized
This thesis deals with models of flat plate collectors, transparent insulation and efficiency factors. An equation for the energy output from a glazed flat plate collector is derived by modelling the collector efficiency factor, F´ as the sum of a constant and a temperature dependent part. An alternative way of testing a flat plate collector, based on this model, is suggested. A complete set of a
The central issue discussed in this thesis is the “essayistic mode”, which is usually described as a set of themes and characterization of the traditional written essay. In our more digitalized world today, it has been argued that some of these essayistic traits could be identified in other types of media, for example in essay films. Since the beginning of the 1990th century the capacity of essay
Svenska gymnasieskolan har under de senaste decennierna genomgått ett antal reformer som har gjort det lättare för friskolor att etablera sig samt givit elever möjlighet att fritt välja och byta skola. Detta, kombinerat med en minskning av antalet gymnasieelever, har lett till en konkurrenssituation där skolorna måste marknadsföra sig för att vinna elever. Skolan har under de senaste decennierna b
Studiens syfte var att undersöka fem svenska soldaters upplevelser av offensiv krigsföring under sin tjänstgöring i Afghanistan. I fokus låg deras hantering av mental belastning och deras behov av stöd före, under och efter insats. Halvstrukturerade intervjuer genomfördes med fem soldater som under 6 månaders tid hade tjänstgjort i Afghanistan mellan åren 2009-2012. Intervjuerna analyserades med T
The process of firms entering and exiting the market has since Schumpeter’s introduction of the concept of creative destruction been a subject of interest for economists aiming to determine what drives economic growth. However, limited availability of data has long been a hindrance to such ambitions and it is not until recent decades that empirical studies on the role of firm dynamics for economic
One of the most invasive choices a democratic society can make is to amend its constitution. Despite the fact that Sweden and Denmark are frequently described as having very similar democracies, the two nations have made different decisions about how these changes should be carried out. The purpose of this essay is to compare and contrast Sweden's and Denmark's constitutional amendment pro
