Sökning: "NRA"

Visar resultat 1 - 5 av 13 avhandlingar innehållade ordet NRA.

  1. 1. Morphometry of the Optic Nerve Head as a Diagnostic Tool for Glaucoma

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Camilla Sandberg Melin; Uppsala universitet.; Uppsala universitet.; [2019]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; optic nerve head; ONH; nerve fibers; glaucoma; optical coherence tomography; OCT; Pigment epithelium central limit-inner limit of the retina minimal distance; PIMD; PIMD-2π; Segmental PIMD-2π; confocal scanning laser tomography; HRT; NRA; variation; variability; variance; loss rate; follow-up.;

    Sammanfattning : Glaucoma is a chronic optic nerve head (ONH) disease. Gradual retinal ganglion cell and nerve fiber loss lead to morphological ONH change and visual field defects. Initial loss is often focal. Rate of progression and life expectancy guide treatment. LÄS MER

  2. 2. Low Secondary Electron Yield Carbon Coatings for Electron Cloud Mitigation in Modern Particle Accelerators

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Christina Yin Vallgren; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Raman spectroscopy; NRA; amorphous carbon; secondary electron yield; LIU; X-Ray Photoelectron Spectroscopy; SEY; AFM; electron cloud; SPS dipole magnet;

    Sammanfattning : In order to upgrade the Large Hadron Collider (LHC) performance to be oriented towards higher energies and higher intensities in the future, a series of improvementsof the existing LHC injectors is planned to take place over the next few years. Electron cloud effects are expected to be enhanced and play a central role in limiting theperformance of the machines of the CERN complex. LÄS MER

  3. 3. Ion Beam Analysis - Development and Application of Nuclear Reaction Analysis Methods, in particular at a Nuclear Microprobe

    Detta är en avhandling från Nuclear Physics (Faculty of Science)

    Författare :K Anders Sjöland; [1996]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ION BEAM ANALYSIS; HYDROGEN ANALYSIS; LITHIUM ANALYSIS; BORON ANALYSIS; FLUORINE ANALYSIS; BNCT; PSD; AFFECTIVE DISORDER; STIM; NRA; PIXE; SURFACE BARRIER DETECTORS; pNRA; Kärnfysik; Nuclear physics; DEPTH PROFILING; NUCLEAR MICROPROBE; PILE-UP REJECTION; Fysicumarkivet A:1996:Sjöland;

    Sammanfattning : This thesis treats the development of Ion Beam Analysis (IBA) methods, principally for the analysis of light elements at a nuclear microprobe (NMP). The light elements are in this context defined as those with an atomic number Z of less than approximately 13 (aluminium). The work reported is to a large extent based upon multiparameter methods. LÄS MER

  4. 4. Uptake of and Preference for Nitrate, Ammonium and Amino Acids by Understory Species in Deciduous Forests

    Detta är en avhandling från Plant Ecology, Ecology Building, SE-223 62 Lund

    Författare :Magnus Zätterström; Lund University.; Lunds universitet.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Soil Science; agricultural hydrology; Lantbrukshydrologi; marklära; Fixation of nitrogen; Kvävefixering; Växtekologi; Plant ecology; wild plants.; understory; rhizosphere; preference; oak forests; NRA; nitrification; nitrate; delta15N; 15N; glutamate; glycine; drying-rewetting; amino acids; ammonium;

    Sammanfattning : AbstractThe uptake of different nitrogen forms by understory species was studied in field and laboratory. Species of the understory in deciduous forests have previously been thought to take up and assimilate only inorganic nitrogen sources. LÄS MER

  5. 5. Investigation of lithium and fluorine content in geological materials using Nuclear Reaction Analysis (NRA)

    Detta är en avhandling från Department of Physics, Lund University

    Författare :Nathaly de La Rosa; Lund University.; Lunds universitet.; [2019-10-15]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nuclear reaction analysis NRA ; Geological material; Elemental composition analysis; Ion Beam Analysis IBA ;

    Sammanfattning : This work focuses on the optimization of the Nuclear Reaction Analysis (NRA) technique to determine the content of lithium and fluorine in geological materials. Measuring low concentration of these isotopes is of great relevance in many fields such as geological, astrophysical, biological and material sciences. LÄS MER