Sökning: "fossil plant remains"

Hittade 5 avhandlingar innehållade orden fossil plant remains.

  1. 1. On plant food in the Scandinavian peninsula in Early Medieval times

    Författare :Ann-Marie Hansson; Delwen Samuel Nesbitt; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; plant food; fossil plant remains; carbonized prehistoric bread; symbolic use of plant food; Scandinavia; Early Medieval Period; Archaeological Science; laborativ arkeologi;

    Sammanfattning : .... LÄS MER

  3. 2. Early land plant spores from the Paleozoic of Sweden – taxonomy, stratigraphy and paleoenvironments

    Författare :Kristina Mehlqvist; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spores; early land plants; taxonomy; stratigraphy; biostratigraphy; Silurian;

    Sammanfattning : The Silurian through earliest Devonian, between ca 444 and 412 million years ago, was characterized by significant changes in global climate and environment. At that time, plants and animals had begun to expand the colonization of previous relatively desolate terrestrial landscape. LÄS MER

  4. 3. Biogas in Sweden - Opportunities and challenges from a systems perspective

    Författare :Mikael Lantz; Miljö- och energisystem; []
    Nyckelord :Biogas; Policy Instruments; Techno-economic assessments; Environmental assessments;

    Sammanfattning : Addressing today’s challenges of reducing our dependence on fossil fuels and related emissions of greenhouse gases requires measures such as increased energy efficiency and replacement of fossil energy carriers with renewable ones. Biogas is one of the fastest growing renewable energy sources in the world and the overarching purpose of the research presented in this doctoral thesis is to explore the prospects of an increased production and utilization of biogas in a Swedish context. LÄS MER

  5. 4. Urbanised Nature in the Past : Site formation and Environmental Developement in Two Swedish Towns, AD 1200-1800

    Författare :Jens Heimdahl; Ann-Marie Robertsson; Jane Sidell; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Urban stratigraphy; environmental reconstruction; site formation; geoarchaeology; dark earth; macrofossil analysis; Quaternary geology; Kvartärgeologi;

    Sammanfattning : In order to explore site formations and reconstruct environmental development in Medieval and Post-Medieval towns, urban occupational strata in Norrköping and Karlstad were studied according to biostratigraphy, sedimentology and pedology. New field procedures including continuous pilot sampling, parallel archaeological and geological stratigraphic interpretation, and on-site analysis of plant macrofossils were developed and applied at archaeological excavations in both towns. LÄS MER

  7. 5. High-Temperature Corrosion in Waste-Fired Boilers: Insights into material selection for fluidized bed heat exchangers and the corrosivity of PbCl2

    Författare :Hampus Lindmark; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Water Walls; High-Temperature Corrosion; Superheaters; PbCl2;

    Sammanfattning : The replacement of fossil fuels with waste-derived fuels for heat and electricity production has gained significant momentum in the European Union (EU), especially in the wake of the implementation of stricter waste management directives and the pursuit of ambitious climate goals. Combustion of waste, however, leads to the formation of a complex and highly corrosive flue gas that cause severe corrosion on important boiler equipment. LÄS MER