Sökning: "Stefan Wallin"

Visar resultat 6 - 10 av 14 avhandlingar innehållade orden Stefan Wallin.

  1. 6. Marknad och medborgare : - elevers valhandlingar i gymnasieutbildningens integrations- och differentieringsprocesser

    Författare :Stefan Lund; Christer Fritzell; Per Gerrevall; Erik Wallin; Växjö universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; educational reform; school choice; youth; social change; critical dis-course analysis; upper secondary education; Education; Pedagogik; Pedagogik; Pedagogics;

    Sammanfattning : Educational restructuring is an international phenomenon which emphasises a voucher system, upper secondary schools’ local decision-making and pupils’ choices in contrast to previous bureaucratic governing. For this reason upper secondary programmes and courses on offer, together with the pupils’ individual choices, have a direct impact on what could be called the upper-secondary education market. LÄS MER

  3. 7. Periodontitis, carotid calcifications and future cardiovascular diseases in older individuals

    Författare :Viveka Wallin Bengtsson; Stefan Renvert; Högskolan Kristianstad; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : Background. Periodontitis is a chronic inflammatory disease with a microbiological etiology affecting the supporting tissues of the tooth. The disease affects approximately 50% of the adult population. The prevalence of periodontitis increases with age. LÄS MER

  4. 8. Periodontitis, carotid calcifications and future cardiovascular diseases in older individuals

    Författare :Viveca Wallin Bengtsson; Stefan Renvert; Malmö universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Parodontit;

    Sammanfattning : Background. Periodontitis is a chronic inflammatory disease with a microbiological etiology affecting the supporting tissues of the tooth. The disease affects approximately 50% of the adult population. The prevalence of periodontitis increases with age. LÄS MER

  5. 9. Accurate physical and numerical modeling of complex vortex phenomena over delta wings

    Författare :Simone Crippa; Arthur Rizzi; Stefan Wallin; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; computational fluid dynamics; CFD; vortical flow; delta wing; aerodynamics; flow physics; steady; unsteady; Vehicle engineering; Farkostteknik;

    Sammanfattning : With this contribution to the AVT-113/VFE-2 task group it was possible to prove the feasibility of high Reynolds number CFD computations to resolve and thus better understand the peculiar dual vortex system encountered on the VFE-2 blunt leading edge delta wing. Initial investigations into this phenomenon seemed to undermine the hypothesis, that the formation of the inner vortex system relies on the laminar state of the boundary layer at separation onset. LÄS MER

  7. 10. Numerical and modelling aspects of large-eddy and hybrid simulations of turbulent flows

    Författare :Matteo Montecchia; Arne V. Johansson; Gert Brethouwer; Stefan Wallin; Dominic Von Terzi; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulence; wall-bounded flows; large-eddy simulation; SGS modelling; OpenFOAM; hybrid RANS-LES; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : In this study, the explicit algebraic sub-grid scale (SGS) model (EAM) has been extensively validated in wall-resolved large-eddy simulations (LES) of wall-bounded turbulent flows at different Reynolds numbers and a wide range of resolutions. Compared to eddy-viscosity based models, the formulation of the EAM is more consistent with the physics and allows to accurately capture SGS anisotropy,which is relevant especially close to walls. LÄS MER