Sökning: "ice growth"

Visar resultat 21 - 25 av 71 avhandlingar innehållade orden ice growth.

  1. 21. 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

  3. 22. Essays on Economic Modeling of Climate Change

    Författare :Gustav Engström; John Hassler; Michael Hoel; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; climate change; economic growth; energy balance models; sustainability; Economics; nationalekonomi;

    Sammanfattning : Structural change in a two-sector model of the climate and the economy introduces issues concerning substitutability among goods in a two-sector economic growth model where emissions from fossil fuels give rise to a climate externality. Substitution is modeled using a CES-production function where the intermediate inputs differ only in their technologies and the way they are affected by the climate externality. LÄS MER

  4. 23. Frost-induced deterioration of concrete in hydraulic structures : Interactions between water absorption, leaching and frost action

    Författare :MARTIN ROSENQVIST; Avdelningen för Byggnadsmaterial; []
    Nyckelord :Vattenbyggnader; Dammar; Betong; Cement; Vattenabsorption; Vattenmättnadsgrad; Nedbrytning; Frostbeständighet; Spjälkning; Makroskopisk islinsbildning; Urlakning; Synergi; Hydraulic structures; Dams; Concrete; Cement; Water absorption; Degree of saturation; Deterioration; Frost resistance; Spalling; Macroscopic ice lens growth; Leaching; Synergy;

    Sammanfattning : Frost deterioration of concrete can result in severe consequences to the safety, durability and functionality of a structure since it impairs the strength of the concrete. Frost damage may occur to structures that are in contact with water and subjected to frost action. LÄS MER

  5. 24. Sjötransporter och regional omvandling : Regleringen av den norrländska vintersjöfarten 1940-1975

    Författare :Martin Eriksson; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Norrland; Sweden; winter shipping; ice-breakers; decision-making; institutional framework; regulation; Economic history; Ekonomisk historia;

    Sammanfattning : This licentiate thesis investigates the decision-making process behind the regulation of winter shipping along the coast of the northern part of Sweden, the Norrland region, in the period 1940-1975. The licentiate thesis examines two aspects of this decision-making process. LÄS MER

  7. 25. Traumatic high-load injuries in the adolescent spine. Clinical, radiological and experimental studies

    Författare :Adad Baranto; Göteborgs universitet; []
    Nyckelord :Adolescence; athletes; spinal loading; back pain; disc degeneration; growth zone; intervertebral disc; MRI; nucleus pulposus; porcine spine; radiography; spine; vertebral endplate;

    Sammanfattning : Background: Disc degeneration and other radiological abnormalities are highly frequent among young athletes in sports with great demands on the back. It has also been reported that athletes with these abnormalities have more back pain than other athletes and non-athletes. LÄS MER