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Sökning: LAR1:ltu > (1980-1989) > (1987) > Naturvetenskap

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1.
  • Aleksandrovski, A. N., et al. (författare)
  • Anomalies of the plastic deformation of solid parahydrogen
  • 1987
  • Ingår i: Soviet Journal of Low Temperature Physics. - 0360-0335. ; 13:10, s. 623-624
  • Tidskriftsartikel (refereegranskat)abstract
    • The work hardening curves σ(ε) of special-purity parahydrogen single crystals are obtained in the temperature range 2-6 °K at very low stresses (σ=5 10 - 2 g/mm2). Our study reveals a number of anomalies, in particular an effect whereby a sample recovers its dimensions after plastic deformation reaching 7%. The work hardening curves of solid neon are also obtained for comparison. The gravity-induced downward flow of parahydrogen single crystals at helium temperatures mentioned in the literature has not been observed.
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2.
  • Das, U.C., et al. (författare)
  • Resistivity and induced polarization responses of arbitarily shaped 3-D bodies in a two-layered Earth
  • 1987
  • Ingår i: Geophysical Prospecting. - : Wiley. - 0016-8025 .- 1365-2478. ; 35:1, s. 98-109
  • Tidskriftsartikel (refereegranskat)abstract
    • Numerical computations using the integral equation method are presented for resistivity and IP responses due to arbitrarily shaped 3‐dimensional bodies in a layered earth. The unknown surface charge density distribution is expressed as the solution of Fredholm's integral equation of the second kind. Use of moment method (with pulse basis function and point‐collocation) yields the matrix equations for the unknowns. The contributions to Green's function are solved (a) analytically for the primary and (b) by convolution for the secondary contributions resulting in a fast algorithm. The further step of computing potential, apparent resistivity, chargeability etc., for any electrode system, is straightforward. Our results show a good agreement with those from finite difference methods and physical tank experiments. The CPU time is only 138 s on a super‐minicomputer for an apparent resistivity pseudo‐section, even with 96 elementary cells as used for discretization. A large number of models for different geological situations were studied; some are presented here.
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  • Fredriksson, Sverker (författare)
  • Diquarks
  • 1987
  • Ingår i: Proceedings. - : Joint Institute for Nuclear Research.
  • Konferensbidrag (refereegranskat)
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  • Hoffmann, F.M., et al. (författare)
  • A FT-IRAS study of the vibrational properties of CO adsorbed on Cu/Ru(001) : II: The dispersion of copper
  • 1987
  • Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 87:3, s. 1857-1865
  • Tidskriftsartikel (refereegranskat)abstract
    • The dispersion of copper adsorbed on a Ru(001) substrate has been investigated by using Fourier transform-infrared reflection absorption spectroscopy (FT-IRAS) and carbon monoxide as a molecular probe. Copper films evaporated at 85 K show a drastically different CO adsorption behavior compared to annealed films and exhibit a variety of adsorption sites. Characteristic C-O stretching frequencies allow us to identify small copper clusters of 1-4 atoms (2138-2123 cm-1), two-dimensional (2120-2110 cm-1) and three-dimensional (2098 cm-1) copper aggregates. After annealing to 250 K copper films at sub- and monolayer coverages form well-ordered small two- and three-dimensional copper aggregates. Formation of the epitaxial monolayer or islands of copper (2082 cm-1) requires a surprizingly mild annealing temperature of 350 K. Further annealing to 540 K results in increasing domain size of the copper islands or annealing of defect sites of the epitaxial monolayer. Multilayer coverages of copper evaporated at 85 K exhibit C-O stretching frequencies found for high-index copper single crystal surfaces, e.g., (211) and (755). This indicates a large number of surface steps and protruding copper atoms associated with rough films. Annealing to 540 K results in a smooth copper layer with preferential (111) orientation (2075 cm-1). The vibrational data presented here for Cu-Ru(001) agree well with previous reports of CO adsorption on copper single crystals, supported or evaporated films, and matrix-isolated clusters. They further allow us to determine the dispersion of supported Cu-Pt and Cu-Ni catalysts from data in the literature.
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  • Resultat 1-10 av 43

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