Sökning: "Anna Andrén"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Anna Andrén.

  1. 1. Degradation of rock and shotcrete due to ice pressure and frost shattering

    Författare :Anna Andrén; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : In recent years the Swedish Rail Administration has observed an increased incidence of shotcrete and rock fall-outs in its tunnels, for which reason it has initiated several research projects, of which the present project entitled "Degradation of rock and shotcrete due to ice pressure and frost shattering" is one. The aim of this licentiate project was to bring together experience and information relating to ice formation and the effect of ice pressure on fault zones, cracks and, in particular, the shotcrete/rock interface. LÄS MER

  3. 2. Freezing Temperature Flows in Railway Tunnels and its Consequence on the Rock Supporting Structure, the Rock and the Reinforcing Elements

    Författare :Anna Andrén; Lars-Olof Dahlström; Erling Nordlund; Lars O Ericsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tunnel; frost penetration; ice formation; freeze-thaw test; frost shattering; temperature measurement; maintenance; degradation of rock and shotcrete; cold climate; Tunnel; köldinträngning; isbildning; frystester; frostsprängning; temperaturmätning; underhåll; nedbrytning av berg och sprutbetong; kallt klimat; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : Water in the surrounding rock mass flows into the tunnel via naturally occurring joints and via cracks caused by the blasting used to excavate the tunnel. The most common method in Sweden to reduce or prevent leakage problems are first and foremost the use of grouting. LÄS MER

  4. 3. Det pedagogiska övervägandet : en uppmärksamhetsinriktande studie i och genom humanvetenskaplig handlingsteori

    Författare :Maria Andrén; Anna-Lena Østern; Högskolan i Gävle; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Pedagogisk metodik;

    Sammanfattning : .... LÄS MER

  5. 4. Gjutningens arenor : Metallhantverkets rumsliga, sociala och politiska organisation i södra Skandinavien under bronsåldern

    Författare :Anna Sörman; Anders Andrén; Alison Klevnäs; Christopher Prescott; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Bronze Age; southern Scandinavia; bronze casting; metalworking; craft production; craft organisation; workshops; social organisation; elite; heterarchy; prestige goods; social reproduction; arkeologi; Archaeology;

    Sammanfattning : Production and use of metalwork in southern Scandinavia during the Bronze Age (1700-500 BC) has above all been attributed to emerging elites. That bronze was a source and medium for social power is evident from its use in socio-political and ritual spheres, the multiple skills and elaborate aesthetics involved in its crafting, and the arenas for influence and control offered by the acquisition of metals through long-distance exchange. LÄS MER

  7. 5. An Archaeology of the Iron Curtain : Material and Metaphor

    Författare :Anna McWilliams; Mats Burström; Anders Andrén; John Schofield; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Archaeology of the contemporary past; Iron Curtain; Cold War; material culture; memory; cultural heritage; Berlin Wall; Austria; Czechoslovakia; Czech Republic; Italy; Slovenia; Yugoslavia; arkeologi; Archaeology; Archaeology subjects;

    Sammanfattning : The Iron Curtain was seen as the divider between East and West in Cold War Europe. The term is closely connected to the Cold War and expressions such as ‘behind the Iron Curtain’ or ‘after the fall of the Iron Curtain’ are common within historical discussions in the second half of the twentieth century. LÄS MER