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Visar resultat 1 - 5 av 18 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Analyzing Synthetic Spider Silk-based Diffraction Grids for the Sunshade Project

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Johanna D'Ciofalo Khodaverdian; Amira Karlsson; [2023]
    Nyckelord :Sunshade project; Diffraction grating; Artificial spider silk; Climate change; Geoengineering;

    Sammanfattning : To mitigate climate change a proposed space-based geoengineering solutionis to screen off solar irradiance by placing a membrane in between the Earthand the Sun. The feasibility of such a project largely depends on minimizingthe mass of the shading screen and as an extension to the Sunshade projectthis thesis investigated how such a low-mass membrane could be designed. LÄS MER

  3. 2. Utvärdering av metod för beräkning av teoretiska sprickvidder för bestämning av tätningsresultat

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Adela Toranian; [2022]
    Nyckelord :Injektering; Inläckage; Srickzon; Deformationszon; Reologi; Bruk; Skärmgeometri; Injekteringskoncept; Grundvatten; Tätning;

    Sammanfattning : When constructing a tunnel, the main challenges are geotechnical and hydrogeological. In the working process the aim in tunneling is to secure the rock mass by sealing the mass before blasting. This is done by grouting. LÄS MER

  4. 3. Dual-polarized geodesic lens in sub-THz

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

    Författare :Wenfu Fu; [2022]
    Nyckelord :beam scanning; dual polarization; fully metallic; geodesic lens; Luneburg lens antenna; THz; strålskanning; korspolarisering; fullt metallisk; geodetisk lins; Luneburg linsantenn; THz;

    Sammanfattning : In the sub-THz frequency range, the geodesic lens can realize low losses and beam scanning capability with high gain and high aperture efficiency due to its fully metallic property and rotational symmetry. Therefore, in high-frequency applications, a geodesic lens is considered a more promising solution in comparison to phased arrays or other beamforming techniques. LÄS MER

  5. 4. Linker substitution in ZIF-8 and its effect on the selective uptake of the greenhouse gases CH4, CO2 and SF6

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Nanoteknologi och funktionella material

    Författare :Daniel Hedbom; [2021]
    Nyckelord :ZIF-8 hybridization; Porous materials; GHG capture;

    Sammanfattning : In this master thesis project, attempts were made to synthesize, pore size tailor, and characterize ZIF-8 and several mixed-linker ZIF structures to improve capture of the greenhouse gasses CH4, CO2, and SF6. Three experimental linkers, 2-methylbenzimidazole, 2-aminobenzimidazole, and 5-nitrobenzimidazole were chosen to gradually substitute 2-methylimidazole as the linker in ZIF-8. LÄS MER

  7. 5. Numerical and experimental analysis of fluid flow in fracture replicas with variable aperture

    Master-uppsats, Stockholms universitet/Institutionen för naturgeografi

    Författare :Brandon Stock; [2020]
    Nyckelord :;

    Sammanfattning : Flow in fractured rocks has been intensively studied in the last decades, in part due to plans in manycountries to site repositories for high level nuclear waster in deep geologic formations. All investigated crystalline rocks have been found to be fractured and the majority of water flows through these fractures andfracture zones. LÄS MER