Sökning: "Vittring"

Visar resultat 11 - 15 av 44 uppsatser innehållade ordet Vittring.

  1. 11. Aeolian and Pedogenic Processes of Loess in Southern England

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Ragna Orbe; [2019]
    Nyckelord :loess; Pegwell Bay; grain size distribution; magnetic susceptibility; past-climate reconstruction; lössavlagringar; Pegwell Bay; partikelstorleks distribution; magnetisk mottaglighet; historisk klimatrekonstruktion;

    Sammanfattning : Loess is an aeolian sediment that can be utilized as a detailed proxy of past climate, since it is one of few sediments that is deposited directly from the atmosphere on land. Investigation of loess deposits can give understanding of past regional and local wind circulation patterns and velocities, atmospheric dustiness, as well as paleo-precipitation and weathering conditions. LÄS MER

  3. 12. Evaluation of influence from matedness on the peak shear strength of natural rock joints

    Uppsats för yrkesexamina på avancerad nivå, KTH/Byggvetenskap

    Författare :Emil Andersson; [2019]
    Nyckelord :Rock joints; Peak shear strength; Matedness; Casagrande et al. criterion; Peak friction angle; Shear strength; Bergssprickor; Maximal skjuvhållfasthet; Passning; Casagrande et al. kriterium; Friktionsvinkel; Skjuvhållfasthet;

    Sammanfattning : In Sweden, the rock mass is commonly used for construction of tunnels and caverns. The rockmass is also used as a foundation for large structures such as bridge abutments and dams. Forthese structures, the understanding of the rock mechanical properties play a key role for reachingan acceptable safety level and minimizing cost. LÄS MER

  4. 13. Bergen såg jag vittra i tidernas lek

    Kandidat-uppsats,

    Författare :Sara Kvarfordt; [2018-09-26]
    Nyckelord :Hällristningar; Vittring; Structure from Motion; Laserskanning; Bronsålder; Norrköping;

    Sammanfattning : In this dissertation, rock art from three rock carving sites, Ekenberg, Himmelstalund and Hageby, in Norrköping are analyzed in search of traces of weathering through digital documentation techniques such as Structure from Motion, laser scanning and photography. Rock art faces threats daily and weathering, which is a natural process that entails the gradual destruction of rock mineral. LÄS MER

  5. 14. Point source carbon capture by porous inorganic carbonates

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

    Författare :Jonas Hultberg; [2018]
    Nyckelord :Carbon capture; Gas separation; Adsorbent; Inorganic carbonates; Point source; Carbon dioxide; Kolavskiljning; Adsorbenter; Oorganiska karbonater; Punktkälla; Koldioxid;

    Sammanfattning : Mesoporous inorganic carbonates (MIC) was synthesized and tested as adsorbents for CO2, using vacuum and temperature swing adsorption. Mesoporous magnesium carbonate (MMC), mesoporous calcium carbonate (MCC) and mesoporous calcium magnesium carbonate (MCMC), all included in MIC, are exceedingly porous with an amorphous structure. LÄS MER

  7. 15. Stratigraphy and pyrite geochemistry of the Lower–Upper Ordovician in the Lerhamn and Fågelsång-3 drill cores, Scania, Sweden

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Fisnik Balija; [2018]
    Nyckelord :Ordovician; shale; drill cores; arsenic; pyrite; heavy metals; Lerhamn; Fågelsång; Scania; Sweden.; Earth and Environmental Sciences;

    Sammanfattning : Arsenik är ett mycket giftigt ämne som finns i berg, mark och grundvatten, och är känt för att orsaka allvarliga hälsoeffekter. Neurologiska skador hos människan inträffar vid koncentrationer så låga som 100 μg/L, medan 1–3 mg/kg kroppsvikt As är en dödlig dos. LÄS MER