Sökning: "Magnus C Johansson"
Visar resultat 1 - 5 av 15 avhandlingar innehållade orden Magnus C Johansson.
1. Diagnosis of interatrial shunts and the influence of patent foramen ovale on oxygen desaturation in obstructive sleep apnea
Sammanfattning : Patent foramen ovale (PFO) is found in 27% of the population and although mostly asymptomatic, PFO has been associated with e.g. cryptogenic stroke and, rarely, also with oxygen desaturation. PFO and atrial septal defects may nowadays be closed percutaneously without open heart surgery. LÄS MER
2. High pressure and high temperature behavior of TiAlN
Sammanfattning : This licentiate thesis mainly reports about the behavior of arc evaporated TiAlN at high pressures and high temperatures. The extreme conditions have been obtained in metal cutting, multi anvil presses or diamond anvil cells. Several characterization techniques have been used, including x-ray diffraction and transmission electron microscopy. LÄS MER
3. Adjusting to the extreme : Thermal adaptation in a freshwater gastropod
Sammanfattning : Temperature is a ubiquitous force influencing biological processes ranging from cellular responses to life span. The thermal environment for many organisms is predicted to change with globally increasing temperatures and studies conducted in natural systems incorporating various evolutionary forces, such as gene flow, is needed. LÄS MER
4. Catalytic combustion of gasified biomass for gas turbine applications
Sammanfattning : Catalytic combustion is an ultra-low emission technology forgas turbines. In parallel to the ongoing development andcommercialization of catalytic combustors fired by naturalgas,an increasing interest is aimed towards renewables, such asgasified biomass. LÄS MER
5. Phase stability and defect structures in (Ti,Al)N hard coatings
Sammanfattning : This study highlights the role of nitrogen vacancies and defect structures in engineering hard coatings with enhanced phase stability and mechanical properties for high temperature applications. Titanium aluminum nitride (Ti,Al)N based materials in the form of thin coatings has remained as an outstanding choice for protection of metal cutting tools due to its superior oxidation resistance and high-temperature wear resistance. LÄS MER