Sökning: "stress urban"

Visar resultat 1 - 5 av 76 avhandlingar innehållade orden stress urban.

  1. 1. Glutathione during stress in man

    Författare :Urban Fläring; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Glutathione, a tripeptide (gamma-glutamyl, -cysteinyl, -glycine), is quantitatively the most important antioxidant in man, protecting cells from the toxic effects of reactive oxygen species (ROS). These highly reactive molecules cause tissue damage and are produced at high rates during critical illness including sepsis [1-4]. LÄS MER

  3. 2. Adolescent self-reported health in the Umeå region : Associations with behavioral, parental and school factors

    Författare :Karina Nygren; Lennart Nygren; Urban Janlert; Curt Hagquist; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; adolescence; school survey; self-reported health; somatic complaints; stress; norm compliance; parent-adolescent relations; compulsory school; school managers; research utilization; ungdomar; skolenkät; självrapporterad hälsa; somatiska besvär; stress; normföljsamhet; föräldrarelationer; skola; skolområdeschefer; forskningsanvändning;

    Sammanfattning : This thesis consists of a quantitative and a qualitative study. The quantitative study (articles I-III) aimed to examine how self-reported health in adolescence is associated with behavioral, parental, and school factors. Through a survey directed at all adolescents in grades 7-9, data were collected in 2005 in a region in northern Sweden (n=5060). LÄS MER

  4. 3. On Turbulence Modelling for Bilge Vortices: A Test of Eight Models for Three Cases

    Författare :Urban Svennberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wake; turbulence modelling; nonlinear eddy-viscosity model; bilge vortices; ship flow; jet; Navier-Stokes equation; two-equation model; Reynolds stress model; vortex;

    Sammanfattning : This work is a test, in three steps, of turbulence models for the calculation of the flow field around ships. Eight models ranging from k-e and k-w models to a Reynolds-stress model (RSM) are tested. LÄS MER

  5. 4. Tribology at the Cutting Edge : A Study of Material Transfer and Damage Mechanisms in Metal Cutting

    Författare :Julia Lundberg Gerth; Urban Wiklund; Uppsala universitet; []
    Nyckelord :Tribology; Metal cutting; Gear hobbing; Wear; Coating; Residual stress; Material transfer; Steel; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

    Sammanfattning : The vision of this thesis is to improve the metal cutting process, with emphasis on the cutting tool, to enable stable and economical industrial production while using expensive tools such as hobs. The aim is to increase the tribological understanding of the mechanisms operating at a cutting edge and of how these can be controlled using different tool parameters. LÄS MER

  7. 5. Mechanics and tribology of micro- and nanolayered PVD coatings

    Författare :Urban Wiklund; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; materialvetenskap; Materials Science;

    Sammanfattning : Thin coatings produced by physical vapour deposition (PVD) are increasingly applied tomechanical components such as metal cutting tools, forming tools and machine elements.Improved micro- and nanolayered PVD coatings have been studied with respect tomechanical and tribological properties. LÄS MER