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Sökning: swepub > Johansson Börje > Refereegranskat > Umeå universitet

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1.
  • Belonoshko, Anatoly, et al. (författare)
  • Properties of the fcc Lennard-Jones crystal model at the limit of superheating
  • 2007
  • Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 76:6, s. 064121-
  • Tidskriftsartikel (refereegranskat)abstract
    • The face-centered-cubic (fcc) Lennard-Jones (LJ) model can be considered as a representative model of a simple solid. We investigate the mechanism of melting at the limit of superheating in the fcc LJ solid by means of the procedure recently developed by us [Phys. Rev. B 73, 012201 (2006)]. Insight into the mechanism of melting was gained by studying diffusion and defects in the fcc LJ solid by means of molecular dynamics simulations. We found that the limit of superheating achieved by us is likely to be the highest so far. We also found that the size of the cluster which ignites the melting is very small (down to five to six atoms, depending on the size of the supercell) and closely correlates with the linear size of a supercell when the number of atoms varies between 500 and 13 500.
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  • Johansson, Börje, et al. (författare)
  • Affinities and frictions of trade networks
  • 1994
  • Ingår i: The annals of regional science. - 0570-1864 .- 1432-0592. ; 28:3, s. 243-261
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper formulates a theoretical framework in which the analysis starts with supplier-customer links of micro type. From this we derive aggregate trade links between nodes in a spatial network. It is shown how affinities and barriers shape and influence the establishment of customer links, and how this forms aggregate patterns of flows. The framework is applied to three types of models for determining trade patterns — random discrete choice, information theory and gravity models. Essentially equivalent solutions are derived.
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  • Resultat 1-4 av 4

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