Sökning: "Tomas Ekström"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Tomas Ekström.

  1. 1. Passive house renovation of Swedish single-family houses from the 1960s and 1970s : Evaluation of cost-effective renovation packages

    Författare :Tomas Ekström; Energi och ByggnadsDesign; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Single-family houses (SFHs) constructed between 1961 and 1980 account for approximately one-third of the total energy use, 31 TWh, for space heating and domestic hot water in Swedish SFHs. These are responsible for about 40 percent of the total energy use in all buildings. LÄS MER

  2. 2. Leaching of concrete : experiments and modelling

    Författare :Tomas Ekström; Avdelningen för Byggnadsmaterial; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; betongdammar; urlakning; dammar; beständighet; skador; laboratorieförsök; beräkningsmetoder; simulering; beräkningsmodeller;

    Sammanfattning : Many concrete dams, and other concrete structures within the hydropower industry are old and in a more or less severe state of degradation. Leaching is, together with freeze-thaw, the most common degradation problem in Swedish hydraulic concrete structures. LÄS MER

  3. 3. Leaching of concrete : the leaching process and its effects

    Författare :Tomas Ekström; Avdelningen för Byggnadsmaterial; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; material technology; water permeability.; concrete dams; byggnadsteknik; building construction; leaching; materiallära; materialteknik;

    Sammanfattning : The present report presents an experimental study of leaching of concrete caused by water percolating through the concrete, or by diffusion from concrete to external water in contact. An apparatus was designed and constructed in which de-ionised water could be forced, by external pressure, through a number of concrete specimens of differing characteristics. LÄS MER

  4. 4. Studies on the terminal reactions of dolichol biosynthesis in rat liver

    Författare :Tomas Ekström; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 5. The influence of biogenic organic compounds on cloud formation

    Författare :Sanna Ekström; Barbara Nozière; Tomas Alsberg; Hans-Christen Hansson; Ernest Weingartner; Stockholms universitet; []
    Nyckelord :biogenic; aerosol; CCN; water-soluble; microorganisms; surfactant; organosulfate; NATURAL SCIENCES; NATURVETENSKAP; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Aerosols and clouds provide the largest uncertainty in the atmospheric radiation budget. The main focus of this thesis was to investigate the ability of organic compounds in aerosol particles to form clouds, and more specifically those emitted by living organisms. LÄS MER