Sökning: "Ljus spektrum"

Visar resultat 11 - 15 av 28 uppsatser innehållade orden Ljus spektrum.

  1. 11. Chemical composition of giant planet hosts

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Frida Ekstrand; [2017]
    Nyckelord :chemical composition; planet hosts; stellar twins; differential abundance analysis; Physics and Astronomy;

    Sammanfattning : Does the formation of planets give imprints on the chemical composition of the host star? In order to test this theory a differential abundance analysis (i.e. comparing two stars' abundances to each other) was carried out on a few stars with and without known planets, to see if any differences were found. LÄS MER

  3. 12. Evaluation of Amyloid Fibrils as Templates for Photon Upconversion by Sensitized Triplet-Triplet Annihilation

    Kandidat-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Sharon Berkowicz; Helena Olsson; Henrik Broberg; [2017]
    Nyckelord :photon upconversion; sensitized triplet-triplet annihilation; anti-stokes emission; amyloid fibrils; whey protein;

    Sammanfattning : In the face of global warming and shrinking resources of fossil fuels the interest in solar energy has increased in recent years. However, the low energy and cost efficiency of current solar cells has up to this date hindered solar energy from playing a major role on the energy market. LÄS MER

  4. 13. Co-pretreatment of spruce and poplar for ethanol production - Effects of mixed feedstocks on pretreatment and enzymatic hydrolysis efficiency

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Hanna Jovanovic; [2017]
    Nyckelord :Biofuels; Bioethanol; Second generation bioethanol; Poplar; Spruce; Enzymatic hydrolysis; Pretreatment; Lignocellulose; Chemical Engineering; Kemiteknik; Technology and Engineering;

    Sammanfattning : Oil is very important for today’s society and the transportation sector is almost completely dependent on this material. Unfortunately, it affects the level of greenhouse gases negatively which in turn contribute to global warming. LÄS MER

  5. 14. Experimental Implementation of a Fiber Noise Cancellation System for Slow Light Laser Locking

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Partikel- och kärnfysik

    Författare :Alexander Bengtsson; [2017]
    Nyckelord :Optical Fibers; Fiber Noise Cancellation; Laser Stabilization; Slow Light Laser Locking; Technology and Engineering;

    Sammanfattning : An electromagnetic wave propagating through an optical fiber is sensitive to external disturbances, such as mechanical vibrations and temperature and pressure fluctuations, which add phase noise onto the wave. For high-precision frequency-based applications this phase noise has to be removed. LÄS MER

  7. 15. Spatially resolved spectroscopy across HD 189733A using exoplanet transits

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Martin Gustavsson; [2017]
    Nyckelord :stellar atmospheres; solar-type stars; stellar spectroscopy; line profiles; exoplanets; Physics and Astronomy;

    Sammanfattning : For testing three-dimensional (3D) hydrodynamic models of stellar atmospheres, spectroscopy across spatially resolved stellar surfaces with high spectral resolution is desired. 3D models predict center-to-limb changes in asymmetries, shapes, strengths and wavelength positions of spectral line profiles, reflecting the hydrodynamics of the stellar atmosphere. LÄS MER