Sökning: "Johan Olsson"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden Johan Olsson.

  1. 1. Synthesis of oligosaccharides corresponding to the inner core LPS of Neisseria Meningitidis and mechanistic details in glycosylations using a novel bicyclic N-acetylglucosamine donor

    Författare :Johan Olsson; Stockholms universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 2. U-Pb baddeleyite geochronology of Precambrian mafic dyke swarms and complexes in southern Africa - regional scale extensional events and the origin of the Bushveld Complex

    Författare :Johan Olsson; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; U-Pb TIMS geochronology; geochemistry; baddeleyite; mafic dyke swarms; mantle plume; Bushveld Complex; Kaapvaal Craton; Zimbabwe Craton; Archean; Proterozoic;

    Sammanfattning : Dolerite dykes are formed when iron- and magnesium-rich (mafic) mantle-derived magmas ascend through the lithosphere (upper part of the mantle) and crystallize as ‘hydro-fractures’ within the crust. Dykes may exist in great numbers to form dyke swarms (linear or radiating), which can be linked to time periods of continental break-up, or attempted break-up events, associated with voluminous volcanism. LÄS MER

  4. 3. Computational Road Mechanics - with Emphasis on FE-analysis of Rutting

    Författare :Johan Olsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-linear FEM; multi-layer structure; asphalt concrete; road design; material models; unbound material;

    Sammanfattning : A road is a very complex structure in which a large number of different structural phenomena occur simultaneously that effects its expected lifetime. The structure itself is of a multi-layer type, in which the different layers consist of materials that exhibit vastly different physical behaviors when subjected to various kinds of loads. LÄS MER

  5. 4. Simulation of rutting phenomenon in road surfaces : by the use of FEM and viscoelasticity

    Författare :Johan Olsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  7. 5. Synthesis of Bacterial Oligosaccharides from N. meningitidis and Mechanistic Details of Stereoselective Glycosylations Using a Novel Bicyclic Donor

    Författare :Johan Olsson; Stefan Oscarson; Jeroen Codée; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; oligosaccharide synthesis; heptose; thioglycoside; glycosylation; Neisseria meningitidis; 2; 3-oxazolidinone; Organic chemistry; Organisk kemi; organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis includes two parts. The first part, comprising Chapters 3, 4 and 5, describes the synthesis of bacterial oligosaccharides. In Chapters 3 and 4, the synthesis of branched and phosphorylated oligosaccharide structures corresponding to inner core epitopes of the lipopolysaccharide (LPS) of the Gram-negative bacteria N. LÄS MER