Sökning: "ring comparison"

Visar resultat 1 - 5 av 45 avhandlingar innehållade orden ring comparison.

  1. 1. Fabry-Pérot based refractometry : development of a transportable refractometer for assessment of gas pressure

    Författare :Clayton Forssén; Ove Axner; Isak Silander; Martin Zelan; Leslie Pendrill; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fabry-pérot; refractometry; optical resonator; transportable; pressure standard; gamor; pressure; metrology; ring comparison; si; pascal; quantumpascal; fysik; Physics;

    Sammanfattning : A unified description of physical phenomena through measurement science is one of the foundational pillars in a global society. The International System of Units (SI) is the most widely used system of units and since its redefinition in 2019, all units encompassed by it are based on fundamental physical constants. LÄS MER

  3. 2. Summer Climate Variability during the Past 1200 Years in Central Scandinavia – A Tree-Ring Perspective

    Författare :Peng Zhang; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Central Scandinavia; climate variability; dendroclimatology; maximum latewood density; Medieval Climate Anomaly; model-proxy data comparison; Pinus sylvestris L.; temperature; tree-ring width;

    Sammanfattning : To set the current 20th century warming in a long-term context, significant efforts have been made to reconstruct hemispheric-to-global temperatures beyond the instrumental period. Tree-rings, which have annual resolution and can be precisely dated, have been widely used to infer past climate variability. LÄS MER

  4. 3. Mitral Ring Motion in Assessment of Left Ventricular Function

    Författare :Birger Wandt; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : The motion of the mitral ring was studied with M-mode echocardiography using the apical four- and two-chamber views.With the purpose of obtaining adequate reference materials for mitral ring motion, 70 healthy subjects were studied. LÄS MER

  5. 4. Modelling ineffective erythropoiesis in myelodysplastic syndromes with ring sideroblasts

    Författare :Edda María Elvarsdóttir; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Myelodysplastic syndromes with ring sideroblast (MDS-RS) is a clonal hematological malignancy characterized by accumulation of iron filled erythroblasts called ring sideroblasts in the bone marrow, and recurrent somatic mutations in the splicing factor gene SF3B1. The disease mainly affects elderly individuals, causing severe anemia in patients for which no curative treatment exists. LÄS MER

  7. 5. Electron - Ion Recombination Studies of Astrophysically Relevant Ions : Storage Ring and Electron Beam Ion Trap Based Measurements

    Författare :Istvan Orban; Reinhold Schuch; Yaming Zou; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; atomic processes; electron-ion recombination; plasma; Physics; Fysik; fysik; Physics;

    Sammanfattning : This thesis contains experimental work that was performed at two state-of-the art devices for electron-ion collision physics, at a heavy-ion storage ring and at an Electron Beam Ion Trap. As a result, absolute recombination rate coefficients for H-like Si, He-like Si, Be-like Si, and Na-like Si, as well as Be-like Ne, Na-like S and Na-like Ar are reported over a wide energy range from μeV to keV. LÄS MER