Sökning: "deoxygenation"

Visar resultat 1 - 5 av 12 uppsatser innehållade ordet deoxygenation.

  1. 1. Desalination of Archaeological Iron Objects in Vacuum

    Master-uppsats, Göteborgs universitet/Institutionen för kulturvård

    Författare :Aleksi Pienimäki; [2023-12-13]
    Nyckelord :Archaeological iron; desalination; vacuum;

    Sammanfattning : This work investigates the efficiency of commercially available vacuum containers as a physical deoxygenation method for desalination solutions for archaeological iron. Other factors are investigated as well, such as the effect of cleaning the objects of their corrosion crusts before treatment and drying them between subsequent treatment baths. LÄS MER

  3. 2. Response of foraminifera Ammonia confertitesta (T6) to ocean acidification, warming, and deoxygenation - An experimental approach

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Elsa Muller; [2023]
    Nyckelord :Acidification; Warming; Deoxygenation; Foraminifera; Ammonia confertitesta T6 ; Culture Experiment; Trace elements; Earth and Environmental Sciences;

    Sammanfattning : Ocean acidification, warmer temperatures, and the expansion of hypoxic zones in coastal areas are direct consequences of the increase in anthropogenic activities. However, so far, the combined effects of these stressors on calcium carbonate-secreting marine microorganisms - foraminifera are complex and poorly understood. LÄS MER

  4. 3. Records of environmental change and sedimentation processes over the last century in a Baltic coastal inlet

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Hanna Nilsson; [2019]
    Nyckelord :Baltic Sea; eutrophication; coastal areas; archipelago; laminated sediments; nutrient inputs; carbon and nitrogen content; biogenic silica; sedimentation; environmental impact; marine geology; Earth and Environmental Sciences;

    Sammanfattning : The marine ecosystem in the Baltic Sea is affected by multiple stress factors, e.g. eutrophication and deoxygenation, overfishing and anthropogenic pollution. Here we evaluate the short-term trends of dissolved oxygen in bottom waters and changes in the primary productivity within a coastal inlet in the Baltic Sea. LÄS MER

  5. 4. Oxygenation conducted in low temperature clean water

    Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

    Författare :Elin Rosén; Andreas Abdelki; Beyar Abdulla; Alan Bugurcu; Mahmoud El Nabelsi; [2019]
    Nyckelord :;

    Sammanfattning : Aeration tests were conducted under non-standard conditions with clean tap water in various temperatures below 20 °C, with the aim of studying changes that may occur. An initial deoxygenation of 0.8 litre water was performed with sodium sulfite and a cobalt catalyst pre-dissolved in water, in order to bind already present dissolved oxygen. LÄS MER

  7. 5. Catalytic Upgrading of Fast Pyrolysis Bio-oil Using Zeolites

    Master-uppsats, KTH/Kraft- och värmeteknologi

    Författare :Elena Wikberg; [2019]
    Nyckelord :;

    Sammanfattning : Fast pyrolysis bio-oil is considered as a possible source for production of liquid bio-fuels and bio-chemicals enabling the necessary transition to a renewable energy system. In this Master’s thesis work the upgrading of fast pyrolysis bio-oils with Fluid Catalytic Cracking (FCC) conversion process at industrially relevant conditions is studied using Fluid Catalytic Cracking Micro Activity Test (FCC MAT) unit at RISE ETC in Piteå, Sweden. LÄS MER