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Sökning: LAR1:ltu > (1980-1989) > (1982) > Konferensbidrag

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  • Berglund, Kris, et al. (författare)
  • Growth of contact nuclei of citric acid monohydrate
  • 1982
  • Ingår i: Nucleation, growth, and impurity effects in crystallization process engineering. - : American Institute of Chemical Engineers. - 0816902267 ; , s. 9-13
  • Konferensbidrag (refereegranskat)
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  • Doe, T.W., et al. (författare)
  • Determination of the state of stress at the Stripa Mine, Sweden
  • 1982
  • Ingår i: Workshop on Hydraulic Fracturing Stress Measurements. - Menlo Park, Calif.
  • Konferensbidrag (refereegranskat)abstract
    • The state of stress at the Stripa Mine has been measured both in a 381-m-deep hole drilled from the surface and in holes drilled from the drifts underground. Hydraulic fracturing and several overcoring methods have been used (Lulea triaxial gauge, CSIRO gauge, USBM gauge, Swedish State Power Board deep-hole Leeman triaxial gauge). Propagation of the hydraulic fractures underground was monitored acoustically in an attempt to determine the location and orientation of the fractures. The results of overcoring and hydraulic fracturing agree well, particularly for the magnitude and orientation of the greatest stress. The hydraulic-fracturing data were interpreted using first-breakdown pressures and tensile-strength values determined using statistical fracture mechanics. Shut-in pressure values were obtained from semi-logarithmic plots of the post-breakdown pressure decay and from reopening the fractures at low pumping rates.
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  • Elfgren, Lennart, et al. (författare)
  • Fatigue of anchor bolts in reinforced concrete foundations
  • 1982
  • Ingår i: Fatigue of Steel and Concrete Structures. - Zürich : International Association for Bridge and Structural Engineering. - 3857480300 ; , s. 463-470
  • Konferensbidrag (refereegranskat)
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  • Jacobson, Bo (författare)
  • A hydrodynamic model of an outer hair cell
  • 1982
  • Ingår i: Proceedings of the 10. annual Northeast Bioengineering Conference. - New York : IEEE Communications Society. ; , s. 273-278
  • Konferensbidrag (refereegranskat)abstract
    • A 10000 times enlarged hydrodynamic model of the outer hair cell stereocila in the inner ear was built. On the model it was possible to measure the force and the force direction for each individual hair as a function of the flow direction and velocity. Measurement were made at the mean flow velocity 10-2 m/s, which is equivalent to a flow velocity in the real ear of about 1 μm/s. The kinematic viscosity of the liquid used in the model was 10000 times higher than the viscosity of perilymph to attain hydrodynamic equality. Two different geometries for the stereocilia pattern were tested. First the force distribution for a W-shaped stereocilia pattern was recorded. This is the stereocilia pattern found in all real ears. It was found that the forces acting on the hairs were very regular and perpendicular to the legs of the W when the flow was directed from the outside of the W. When the flow was reversed, the forces were not reversed, but were much more irregular. This can eventually explain the half wave rectification of the nerve signals. As a second experiment, the force distribution for a V-shaped stereocilia pattern was recorded. Here the forces were irregular both when the flow was directed into the V and when it was directed against the edge of the V
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  • Resultat 1-10 av 33

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