Sökning: "Röntgenfluorescens XRF"
Visar resultat 6 - 10 av 17 uppsatser innehållade orden Röntgenfluorescens XRF.
6. Utvärdering av ett portabelt röntgenfluorescens-mätinstrument för mätning av tungmetaller i havsvatten och bottensediment
M1-uppsats, Högskolan i Gävle/ElektronikSammanfattning : Heavy metals are metallic elements with a density of at least 5 g/cm^3. Some heavy metals exist in nature and within organisms naturally, but many heavy metals are poisonous at low concentrations and the amount of heavy metals in nature has increased because of human activity, both in water and on land. LÄS MER
7. Graphene Quantum Dots as Fluorescent and Passivation Agents for Multimodal Bioimaging
Master-uppsats, KTH/Tillämpad fysikSammanfattning : Zero-dimensional graphene (carbon) quantum dots have been drawing attention in bio-related applications since their discovery, especially for their optical properties, chemical stability, and easily modifiable surface. This thesis focuses on the green synthesis of nitrogen-doped graphene quantum dots (GQDs) for dual-mode bioimaging with X-ray fluorescence (XRF) and optical fluorescence. LÄS MER
8. XRF-mätning av tungmetaller i bottensediment under vatten
Kandidat-uppsats, Mittuniversitetet/Institutionen för elektronikkonstruktionSammanfattning : Syftet med denna undersökning har varit att besvara frågan om röntgenfluorescens är en bra metod för att mäta kvicksilver i bottensediment under vatten. Undersökningen har genomförts genom ett fysiskt experiment och kräver någon form av ett röntgenfluorescenssystem. LÄS MER
9. Material characterization of multi-layered Zn-alloy coatings on fasteners : Effects on corrosion resistance, electrical conductivity and friction
Master-uppsats, KTH/MaterialvetenskapSammanfattning : Electroplated zinc-alloy coatings have been used on fasteners in the automotive industry for many years. The coating often consists of three layers: a zinc-alloy layer, a passivation layer and a sealer or top-coat. LÄS MER
10. Influence of Sample Preparation on Portable XRF-analyses of Aeolian Sediments: a Case Study
Master-uppsats, Uppsala universitet/Institutionen för geovetenskaperSammanfattning : The geochemical composition of aeolian sediments like windblown dust particles is of major importance for the exploration of dust origin and weathering conditions. This allows for the reconstruction of dust transport pathways and thus wind directions and palaeoclimate conditions. LÄS MER