Sökning: "hur bildas kol"

Visar resultat 21 - 25 av 30 uppsatser innehållade orden hur bildas kol.

  1. 21. Upgrade of the Graphitization System for 14C AMS Analyses

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Philip Dalsbecker; [2013]
    Nyckelord :14C; AMS; Accelerator mass spectrometry; radiocarbon; vacuum; carbon-14; Physics and Astronomy;

    Sammanfattning : For decades, accelerator mass spectrometry (AMS) has been used for radiocarbon dating. The background of this technique is outlined along with an in-depth look at the graphitization process used to prepare samples for AMS analysis. LÄS MER

  3. 22. Biogasrötning av socker- och foderbetor : Jämförelse av färska, stuklagrade samt ensilerade betor i laboratorieskala

    Magister-uppsats, Sektionen för ekonomi och teknik (SET)

    Författare :Tommy Karlsson; [2012]
    Nyckelord :Biogas; laboratorieskala; sockerbetor; foderbetor; färska; stuklagrade; ensilerade; batchskala; Tommy; Karlsson;

    Sammanfattning : Fossil fuels are affecting our climate negatively and there is a limited amount of them in the world, which leads to the importance of finding alternative fuels. One alternative is biogas, which is produced though a digestion process of different organic materials in a biogasreactor. LÄS MER

  4. 23. Fossil pigments and pigment organelles - colouration in deep time

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Ellinor Martin; [2012]
    Nyckelord :ommochrome; paleobiology; Green Riverformationen; Furformationen; fjädrar; insekter; fossil; ommokrom; paleobiologi; melanin; insect; feather; Fur Formation; Green River Formation.; Earth and Environmental Sciences;

    Sammanfattning : Pigmentation is important in all animals and plants, e.g., for protection against radiation, for signalling and as camouflage. The fossil record contains both colourful bird feathers and insect cuticles. LÄS MER

  5. 24. Charged pion spectra at high pT in pp collisions at (roten ur) S = 900 GeV, measured by the ALICE TPC

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Partikel- och kärnfysik

    Författare :Lene Bryngemark; [2011]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : The ALICE Time Projection Chamber (TPC) is used for tracking and measuring momentum and specific energy loss, dE/dx, of charged particles produced in hadron collisions at the LHC. This Master’s dissertation describes the statistical identification of charged hadrons (pions, kaons and protons) on the relativistic rise (transverse momentum pT > 3 GeV/c) of the dE/dx curve of the ALICE TPC. LÄS MER

  7. 25. Effekter av näringstillförsel på CO2-utbytet på Fäjemyr

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Sandra Persson; [2011]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : During the last century the carbon dioxide, CO2, concentration in our atmosphere has increased because of anthropogenic emissions, mainly from fossil fuel burning. This release of carbon dioxide has caused an increase of the greenhouse effect. LÄS MER