Sökning: "x-rays: general"

Visar resultat 1 - 5 av 23 avhandlingar innehållade orden x-rays: general.

  1. 1. Model catalysts studied by x-rays, visible and infrared light

    Författare :Stefano Albertin; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High Energy Surface X-ray Diffraction; X-ray Photoelectron Spectroscopy; oxidation; Pd 100 ; PdO; Ir 100 ; IrO2; in-situ; operando; Surface Optical Reflectance;

    Sammanfattning : This work is focused on the study of transition metal model catalysts for gas-phase heterogeneous catalysis, studied with light-based in-situ and operando techniques.Metallic model catalysts, such as Palladium (Pd) and Iridium (Ir) single crystals and in minor part deposited Rhodium (Rh), were studied using a combination of x-ray and non x-ray techniques. LÄS MER

  3. 2. 1D to 3D Magnetism in Quantum Materials: A study by Muons, Neutrons & X-rays

    Författare :Ola Kenji Forslund; Martin Månsson; Robert Kiefl; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; muon; magnetism; scattering; quantum materials; Material and Nano Physics; Material- och nanofysik;

    Sammanfattning : A collection of works stretching from low- to three-dimensional magnetism are presented, studied mostly through muon spin rotation, relaxation and resonance (µ +SR). The theoretical background of this technique is outlined in Chapter 2, which introduces the subject from the muon particle as an astro[1]nomical particle to how they are produced here on Earth. LÄS MER

  4. 3. Progression of periodontitis and influence of periodontal bacteria on release of inflammatory markers in Swedish adults

    Författare :Stella Airila-Månsson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Periodontal diseases; questionnaires; x-rays; disease progression; periodontal pathogens; gingival crevicular fluid; inflammation mediators; matrix metalloproteinases;

    Sammanfattning : Periodontitis is a common infectious disease worldwide. An estimated 15-35% of the adult population in industrialized countries suffers from this multifactorial disease. The percentage of people affected by periodontal disease increases with age, reaching a peak at the age of 5060 years. LÄS MER

  5. 4. Development and Applications of a Laser-Wakefield X-ray Source

    Författare :Isabel Gallardo Gonzalez; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser-wakefield acceleration; betatron radiation; ionization-induced trapping; direct laser acceleration; laser-wakefield merging; warm dense matter; phase-contrast imaging; Fysicumarkivet A:2018:Gallardo;

    Sammanfattning : In laser-wakefield acceleration (LWFA), a femtosecond laser pulse is tightly focused in a gas to intensities exceeding 1018 W/cm2 . The laser radiation ionizes the medium and excites a plasma wave that travels behind the laser pulse. LÄS MER

  7. 5. Flourescence properties of trendy molecules studied with synchrotron radiation

    Författare :Gemma Vall-Llosera; Elisabeth Rachlew-Källne; Ahmed Al-Khalili; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning : This thesis summarises the experimental results on molecular spectroscopy of gas phase molecules using synchrotron radiation in the UV- VUV and soft-X rays regions. The results of applying Photon Induced Fluorescence Spectroscopy (PIFS) to D2, H2S, H2O and pyrimidine are presented and discussed. LÄS MER