Sökning: "Johan Jönsson"
Visar resultat 1 - 5 av 21 avhandlingar innehållade orden Johan Jönsson.
1. Slag/Metal Metallurgy in Iron and Steel Melts
Sammanfattning : In this work, the metal and slag phase mixing in three steps of a ladle refining operation of steel melts and for an oxygen balance during cooling of cast iron melts have been studied at two Swedish steel plants and at two Swedish cast iron foundries, respectively. In order to predict the oxygen activity in the steel bulk in equilibrium with the top slag as well as in metal droplets in the top slag in equilibrium with the top slag, three slag models were used. LÄS MER
2. New concepts and techniques for quantification and trace analysis by gas chromatography
Sammanfattning : In the first part of this thesis, strategies for avoiding systematic errors when quantifying the main components in mixtures of solvents has been developed (paper I). It is shown that variations in density caused by variations in sample composition and/or volume contraction need to be taken into account. In this way, quantification can be improved. LÄS MER
3. A Probabilistic Approach to Non-Markovian Impulse Control
Sammanfattning : This thesis treats mathematical considerations that arise in relation to certain stochastic optimal control problems, in particular of switching and impulse type. Both of these problems are extensions of the well-known optimal stopping problem. LÄS MER
4. High precision Ac susceptibility : a probe to exchange bias, and flux creep in high-Tcmaterials
Sammanfattning : .... LÄS MER
5. Moisture Induced Stresses in Timber Structures
Sammanfattning : Wood is a hygroscopic material; always striving to reach equilibrium with the surrounding air, and consequently the moisture content is different in different climate conditions. The strength of wood is directly dependent on the moisture content, lower moisture content leads to increasing strength. LÄS MER