Sökning: "sapphire"

Visar resultat 1 - 5 av 22 uppsatser innehållade ordet sapphire.

  1. 1. Gas in Scattering Media Absorption Spectroscopy in Large Geometries: Towards Monitoring Oxygen in Adult Lungs

    Master-uppsats, Lunds universitet/Förbränningsfysik; Lunds universitet/Fysiska institutionen

    Författare :Anna Brandt; [2022]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : GAs in Scattering Media Absorption Spectroscopy (GASMAS) is a technique to study free gas inside strongly scattering bulk-materials. GASMAS is successful in safely measuring oxygen in lungs of neonates, with low-power tuneable diode-laser spectroscopy at 760 nm. LÄS MER

  3. 2. Multi-spectral X-ray imaging with a laser-plasma accelerator

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Andrea Angella; [2022]
    Nyckelord :Multi-spectral imaging; single-photon counting; X-ray absorption spectroscopy; XAS; LWFA; laser-wakefield acceleration; K-edge; imaging; metal-detection algorithm; Physics and Astronomy;

    Sammanfattning : This master thesis focuses on the creation of an algorithm to perform multispectral imaging of a metallic target using X-rays. The generation of an ultrashort high-power low-divergent X-ray beam is performed by means of a Ti:Sapphire laser driven wake-field plasma accelerator. LÄS MER

  4. 3. A study of optical and structural properties of spin-coated V2O3 thin films on sapphire substrates

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Jennifer Silander; [2022]
    Nyckelord :Optical properties; transmittance; FTIR spectrometry; scanning electron microscopy; x-ray diffraction; metal-insulator transition; crystalline material; sol-gel; spin-coating; vanadium oxide; infrared light;

    Sammanfattning : Many transition metal oxides exhibit a Metal-Insulator Transition (MIT). This is an interesting phenomenon where the material undergoes a structural phase transition, and the electronic charge is redistributed in the crystal lattice. LÄS MER

  5. 4. Characterisation of GaN HEMTs on Different Substrates for Power Electronics Applications

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Hithiksha Krishna Murthy; [2022]
    Nyckelord :Gallium nitrate; High Mobility Electron Transistor; Silicon carbide; Silicon; Sapphire; substrates; power electronics;

    Sammanfattning : GaN-based High Electron Mobility Transistors (HEMT) are appealing because of their large breakdown field, high saturation velocity, and superior thermal conductivity. They work at high temperature without much degradation. HEMTs have a few drawbacks despite many positives. The cost of developing GaN HEMTs on a native substrate is high. LÄS MER

  7. 5. Method for interfacial energy determination of gold nanoparticles on solid surfaces

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Fasta tillståndets fysik

    Författare :Mikaela Petersson; [2020]
    Nyckelord :Nanoparticles; sintering; interfacial energies; Young s equation; contact angle; Au; Si; silica; Sapphire; Al2O3; SEM; AFM; TEM; FFT; Science General;

    Sammanfattning : The high surface-to-volume ratio of nanoparticles (NPs) makes them an interesting source for scientific research. How interfacial energies interplay between such a small structure and a solid bulk surface, are important because of the versatile applications NPs regard. LÄS MER