Sökning: "XRF"

Visar resultat 21 - 25 av 146 uppsatser innehållade ordet XRF.

  1. 21. Water-based Synthesis of Superparamagnetic X-ray Fluorescent Contrast Agents

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Daniel Cortés García; [2022]
    Nyckelord :Nanoparticles; SPIONs; XFCT; co-precipitation.; Nanopartiklar; SPIONs; XFCT; samfällning;

    Sammanfattning : Nowadays, nanomedicine is one of the most important application areas fornanoparticles (NPs), where the design and synthesis of new hybrid nanostructures have attracted much interest, when combining properties and functionalities from different constituents. For example, they have been extensivelyused for dual-mode imaging. LÄS MER

  3. 22. X-Ray Fluorescence of Metal Halide Perovskites

    Kandidat-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Samuel Narciso Silva; [2022]
    Nyckelord :Perovskite; X-ray; Fluorescence; Python; PyMCA; Synchrotron radiation; Physics and Astronomy;

    Sammanfattning : This thesis has the aim to provide a framework for analyzing X-ray fluorescence (XRF) data obtained from German Electron-Synchrotron Group (DESY). The theoretical analysis shows that XRF competes with Auger emission, and works mainly for elements with high atomic number. Here, incident X-rays of 13. LÄS MER

  4. 23. Effect of ash on catalytic activity for passive regeneration of catalytic diesel particulate filter : Evaluation of ash deposition by laboratory ageing

    Master-uppsats, KTH/Kemiteknik

    Författare :Gisela Engström; [2022]
    Nyckelord :Diesel Particulate Filter; Ash deposition; Laboratory Ageing; Catalytic Activity; Passive regeneration;

    Sammanfattning : Askackumulering i dieselpartikelfilter är ett välkänt problem som resulterar i ett förhöjt mottryck och påverkad prestanda hos fordonet. Däremot ges sällan uppmärksamhet åt filtrets katalytiska aktivitet och hur det påverkas vid förekomst av avgasföroreningar. LÄS MER

  5. 24. Elemental variability in tree-rings as indicator for climate change : a case study on beech and oak trees at the Laacher See, Germany

    Master-uppsats, Stockholms universitet/Institutionen för naturgeografi

    Författare :Ann-Kathrin Wild; [2022]
    Nyckelord :trace elements; tree-rings; dendrochemistry; dendroclimatology; ITRAX; Laacher See; mofettes; tree-bark; Quercus sp.; Fagus sp.;

    Sammanfattning : The aim of this study was to contribute to the comprehension of the connection of element uptake in trees at the Laacher See in Germany and climatic parameters on different time scales. Understanding the relationship of certain elements in trees and temperature might enable the assignment of extraordinary high peaks in the elemental concentration, which cannot be explained by temperature, to another process as CO2 degassing of the mofettes, which are relics of the volcanic past of the lake. LÄS MER

  7. 25. Utvärdering av ett portabelt röntgenfluorescens-mätinstrument för mätning av tungmetaller i havsvatten och bottensediment

    M1-uppsats, Högskolan i Gävle/Elektronik

    Författare :Max Tuleborg; [2022]
    Nyckelord :;

    Sammanfattning : 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