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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);hsvcat:1"

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

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1.
  • Gustavsson, Jan, et al. (författare)
  • A submultiplicative function
  • 1989
  • Ingår i: Indagationes mathematicae (Proceedings). - : Elsevier BV. - 1385-7258. ; 92:4, s. 435-442
  • Tidskriftsartikel (refereegranskat)
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  • Widenfalk, Lennart, et al. (författare)
  • A multidisciplinary investigation of the Notträsk Gabbro, northern Sweden
  • 1985
  • Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 107:2, s. 109-126
  • Tidskriftsartikel (refereegranskat)abstract
    • The differentiated, sulfide-bearing gabbro near the city of Boden in northern Sweden has been investigated in order to get a plausible model for its formation, shape and age. The gabbro is associated with a major fault system along which several intrusive bodies occur. The largest of these has been traversed by a gravimetric, magnetometric and geological profile. The investigated intrusion is undeformed and oval-shaped and covers some 20 km2. The outer parts of the body consist of a norite in contact with older meatasediments and granites of varying age. Inside the norite occurs a magnetite-rich gabbro, which forms a ring around the centre of the massif, which in turn consists of leucogabbro-olivine gabbro. Fe, Ti and K are low in the centre where Mg and Cr have their highest contents. Impregnations of sulfides and a massive pyrrhotite vein with some 1 % Ni are located in the norite. A number of intrusion models have been tested by computer modelling combining gravimetric and magnetic field data. The most probable model seems to be a funnel-shaped body pointing downwards. The different gabbro types dip steeply inwards indicating vertical zones rather than horizontal. Palaeomagnetic measurements show that the intrusion has a similar orientation of magnetization as other gabbros of the Haparanda series in northern Sweden (1800-1900 Ga, Rb-Sr). Furthermore, the pole distributions show that the rock cooled slowly, which may indicate that the present outcrop is a deep part of an eroded intrusion. The massif is supposed to have been formed by a diapiric re-emplacement of primary horizontal cumulates formed in the sequence olivine gabbro-leucogabbro-magnetite-bearing gabbro-norite.
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  • 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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  • Aleksandrovskii, A. N., et al. (författare)
  • Thermal expansion of solid parahydrogen at helium temperatures
  • 1989
  • Ingår i: Soviet Journal of Low Temperature Physics. - 0360-0335. ; 15:8, s. 492-493
  • Tidskriftsartikel (refereegranskat)abstract
    • Thermal expansion of solid parahydrogen is investigated in the temperature range from 0.9 to 5 K. The content of the orthomodification in parahydrogen is 0.13 at. %, and that of nonhydrogen impurities is less than 2 10 - 3 at. %. No anisotropy in thermal expansion was observed within the experimental error. The temperature dependence of the linear expansion coefficient can be described by the expression α=1.82 10 - 7 T3. The obtained values of α are in good agreement with the available data on compressibility and ([partial derivate]p/[partial derivate]T)V. The Grüneisen coefficient is γ=3αV/CV`T=2.00 ± 0.25.
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