Sökning: "low-temperatures"

Visar resultat 1 - 5 av 291 avhandlingar innehållade ordet low-temperatures.

  1. 1. Anaerobic digestion of crop residues at low temperatures

    Författare :Irene Bohn; Bioteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bioteknik; Biotechnology; kontroll av utsläpp; Miljöteknik; Environmental technology; pollution control; methanogens; low temperature; crop residues; Anaerobic digestion; farm-scale digestion; fluorescence in situ hybridization;

    Sammanfattning : Biogas is a renewable source of energy. Residues from agriculture contain considerable energy potential and are suitable substrates for biogas production, but in Sweden the utilization of these residues is low. The economic feasibility of biogas production in general is low, and only limited subsidies are provided by the state. LÄS MER

  3. 2. Experimental investigations of specific heat at low temperatures

    Författare :Kari Marklund; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 3. Design and Construction of Low-Temperature Scanning Tunnelling Microscope for Spectroscopy

    Författare :Joakim Lindahl; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mechanical properties; thermophysical properties; stepper motor; ultra-high vacuum; inertial-mass; low temperatures; scanning tunneling microscopy; optical propertie; Fysik; Semiconductory physics; Physics; scanning tunneling luminescence; local probe; photon emission; local carrier injection; Halvledarfysik; Fysicumarkivet A:1998:Lindahl;

    Sammanfattning : This thesis discusses some of the fundamental requirements needed to be fulfilled when constructing a low temperature scanning tunnelling microscope (STM). Three different designs, two non-vacuum and one ultra-high vacuum (UHV), based on either inertial-mass or novel stepper motor principles are presented. LÄS MER

  5. 4. Thermo-Mechanical Behaviour of Refrigerated Caverns in Hard Rock

    Författare :Rune Glamheden; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; thermal deformation; rock caverns; igneous rocks; thermal properties; underground storage; low temperatures; refrigeration; thermal strain;

    Sammanfattning : For almost 4 decades, underground caverns in hard rock have been used to store liquefied petroleum gases (LPG) and refrigerated products, such as foods and chemicals. The design of such facilities has, however, been founded on relatively limited knowledge of the reaction of rock masses to cooling. LÄS MER

  7. 5. Kinetics and mechanisms of alkali feldspar dissolution at low temperatures

    Författare :Peter Schweda; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER