Sökning: "Erik Bergström"

Visar resultat 11 - 15 av 31 avhandlingar innehållade orden Erik Bergström.

  1. 11. Phenomenology of Inert Scalar and Supersymmetric Dark Matter

    Författare :Erik Lundström; Joakim Edsjö; Lars Bergström; Michel Tytgat; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Dark matter; inert scalars; supersymmetry; indirect detection; accelerator searches; Physics; Fysik; Astroparticle physics; Astropartikelfysik; Elementary particle physics; Elementarpartikelfysik; teoretisk fysik; Theoretical Physics;

    Sammanfattning : While the dark matter has so far only revealed itself through the gravitational influence it exerts on its surroundings, there are good reasons to believe it is made up by WIMPs – a hypothetical class of heavy elementary particles not encompassed by the Standard Model of particle physics. The Inert Doublet Model constitutes a simple extension of the Standard Model Higgs sector. LÄS MER

  3. 12. Building crystals out of crystals : Synthesis, structure and magnetic properties of iron oxide nanoparticles and self-assembled mesocrystals

    Författare :Erik Wetterskog; Lennart Bergström; Markus Niederberger; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iron oxide; nanoparticle; synthesis; self-assembly; characterization; electron microscopy; scattering; magnetic properties; Materials Chemistry; materialkemi;

    Sammanfattning : This thesis is focused on the fabrication and characterization of self-assembled arrays of magnetic iron oxide (Fe3O4, γ-Fe2O3 and Fe1-xO) nanoparticles. The synthesis of spherical and cubic iron oxide nanocrystals, with sizes between 5 and 30 nm and narrow size distributions, is demonstrated, along with a rigorous morphological characterization of the cubic nanoparticles. LÄS MER

  4. 13. Search for rare neutral two-body channels in the pp annihilation at rest : performed by measurments of high energy γ-rays using a modular NaI(Tl)-spectrometer

    Författare :Lars Adiels; Ingmar Bergström; Erik Johansson; Kungliga Tekniska högskolan; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; fysik; Physics;

    Sammanfattning : .... LÄS MER

  5. 14. Development of Salt-Sensitive Hypertension in Hydronephrosis

    Författare :Mattias Carlström; Erik Persson; Nils Wåhlin; Russell Brown; Göran Bergström; Uppsala universitet; []
    Nyckelord :Physiology; blood pressure; nephrectomy; nitric oxide; oxidative stress; renal function; renin angiotensin system; salt-sensitivity; telemetry; tubuloglomerular feedback; ureteral obstruction; Fysiologi;

    Sammanfattning : Hydronephrosis, due to ureteropelvic junction obstruction, is a common condition in infants with an incidence of approximately 0.5-1%. During the last decade, the surgical management of non-symptomatic hydronephrosis has become more conservative, and the long-term physiological consequences of this new policy are unclear. LÄS MER

  7. 15. Health, Risk-Taking Behavior and Sexuality in Swedish Adolescents

    Författare :Lars I Holmberg; Claes Sundelin; Lars Jacobsson; Dan Hellberg; Erik Bergström; Uppsala universitet; []
    Nyckelord :Pediatrics; unplanned pregnacy; abortion; adolescents; young men; individual support; Outpatient Clinic for Adolescents; Sweden; decision making; grounded theory; health behavior; risk behavior; sexual behavior; vocational program; theoretical program; Pediatrik;

    Sammanfattning : The overall aims of this research were to develop methods of identifying adolescents with unhealthy and/or risk-taking behavior with special reference to sexuality, and to evaluate support measures for young people in need of such interventions. A further aim was to assess strategies for preventing unhealthy and/or risk-taking behavior. LÄS MER