Sökning: "Mats Persson"

Visar resultat 1 - 5 av 47 avhandlingar innehållade orden Mats Persson.

  1. 1. Spectral Computed Tomography with a Photon-Counting Silicon-Strip Detector

    Författare :Mats Persson; Mats Danielsson; Hans Bornefalk; Jiang Hsieh; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Photon-counting; silicon-strip detector; spectral computed tomography; ring artifacts; fluence rate; basis material decomposition; sub-pixel information; Fysik; Physics;

    Sammanfattning : Computed tomography (CT) is a widely used medical imaging modality. By rotating an x-ray tube and an x-ray detector around the patient, a CT scanner is able to measure the x-ray transmission from all directions and form an image of the patient’s interior. LÄS MER

  3. 2. Spectral Photon-Counting Computed Tomography with Silicon Detectors: New Models and Applications

    Författare :Fredrik Grönberg; Mats Danielsson; Mats Persson; Amir Pourmorteza; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photon-counting; spectral computed tomography; material decomposition; pulse pileup; Compton scatter; image formation; fotonräknande; spektral datortomografi; materialbasupdelning; pulsöverlagring; Comptonspridning; bildbildning; Physics; Fysik;

    Sammanfattning : X-ray computed tomography (CT) is a widely used imaging modality that enables visualization of nearly every part of the human body. It is used for diagnosis of disease and injury as well as medical treatment planning. LÄS MER

  4. 3. In good times and in bad Immigrants, Self-employment and Social insurances

    Författare :Mats Persson; Centrum för ekonomisk demografi; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : This thesis analyses self-employment, sickness absence and early retirement pension among immigrants in Sweden. The empirical analysis investigate a period, 1981-2003, characterized by a transformation from high employment and expansion of the welfare state in the 1980s into a state with high unemployment and tightening social insurance systems during in the 1990s, This thesis goes beyond most previous studies in adopting a regional approach, thereby allowing for an analysis of the importance of local and regional labour market conditions. LÄS MER

  5. 4. Inflationary expectations and the natural rate hypothesis

    Författare :Mats Persson; Handelshögskolan i Stockholm; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : During the last decade, as a response to the accelerating inflation and the persistingly high unemployment rates, microeconomic theory has experienced a rapid and fruitful development. One of the most challenging features of modern macro theory has been the emphasis on the role of inflationary expectations, and the hypothesis that unemployment cannot in the long run be reduced below a certain, "natural", rate. LÄS MER

  7. 5. Lessons Learned in Knowledge Managment - the case of construction

    Författare :Mats Persson; Byggproduktion; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Construction technology; Industriell ekonomi; Anläggningsteknik; Quality Management; Project Management; Knowledge Management; Construction sector; Commercial and industrial economics;

    Sammanfattning : The construction sector has been criticised in recent years for being inefficient. The critique involved describes finished buildings as having flaws and there being a lack of interest within the construction sector in assembling knowledge and sharing experience. LÄS MER