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Träfflista för sökning "LAR1:ltu ;srt2:(1980-1989);srt2:(1984)"

Sökning: LAR1:ltu > (1980-1989) > (1984)

  • Resultat 51-60 av 229
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51.
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52.
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53.
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54.
  • Forssberg, Eric, et al. (författare)
  • Computer-assisted calculations of thermodynamic equilibria in the chalcopyrite-ethyl xanthate system
  • 1984
  • Ingår i: Reagents in the Minerals Industry. - London : The Institution of Mining and Metallurgy. - 0900488786 ; , s. 251-264
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Calculations show that thermodynamic data can be used to construct pulp chemistry models that satisfactorily describe events in mineral pulps. The usefulness of such models can be enhanced by the insertion of kinetic restrictions derived from analyses of mineral pulps from commercial-scale operations. A number of interesting findings concerning the chalcopyrite-ethyl xanthate system are demonstrated. As it is possible to calculate an operating line for any given flotation system, the calculation results can be compared at all times with practical experience and measurements of flotation processes.
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55.
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56.
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57.
  • Fransson, Lennart, et al. (författare)
  • Iskrafter mot bropelare
  • 1984
  • Rapport (övrigt vetenskapligt/konstnärligt)
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58.
  • Fredriksson, Sverker (författare)
  • Hello diquark, goodbye gluon !
  • 1984
  • Ingår i: New Particle Production. - : Editions Frontieres. ; , s. 479-
  • Konferensbidrag (refereegranskat)
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59.
  • Fredriksson, Sverker (författare)
  • Nuclear structure functions and the size of diquarks in nucleons
  • 1984
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 52:9, s. 724-726
  • Tidskriftsartikel (refereegranskat)abstract
    • It is suggested that the observed difference between deep-inelastic structure functions from iron and deuterium targets comes about because two of the quarks in a nucleon are tightly bound in a diquark. It suffices for reproducing the data to assume that the diquark radius is enhanced by 10%-45% in a dense nucleus because of the disturbance from the surrounding nucleons. It is suggested how such a change of the diquark scale could be distinguished from the recently proposed change in the scale of the whole nucleon.
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60.
  • Frietsch, Rudyard (författare)
  • Formation of Mg-bearing magnetite and serpentine in skarn iron ores in northern Sweden
  • 1984
  • Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 106:3, s. 219-230
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper deals with the formation of magnetite in connection with sulphurization and serpentinization of skarn iron ores in Early Proterozoic (1.9 Ga) metasediments and mafic metavolcanics in northern Sweden. The ores contain Ca-Mg and Mg silicates which are characterized by a high Mg/(Mg + Fe) ratio, being mainly higher than 0.8. This feature is possibly due to an original high content of sulphur in the chemically precipitated ore material. During regional metamorphism involving heat transfer and recrystallization there occurred internal reactions. Sulphur reacting with primary, more Fe-rich silicates, gave rise to more Mg-rich silicates and a simultaneous formation of iron sulphides and magnetite. Calculations made on the Stora Sahavaara ore show, however, that the sulphide-silicate reactions could only have attributed to relatively restricted amounts of magnetite. The magnetite of the ores often contains small amounts of magnesium, at maximum 6 weight% Mg. The magnesium-bearing magnetite is mostly associated with serpentine which is an alteration product of olivine, tremolite and diopside. The occurrence of the magnesium-bearing magnetite is attributed to serpentinization which released iron from the silicates, and their high magnesium/iron ratio could in part be related to this process. However, the formation of magnetite in connection with serpentinization is only known in some deposits, and it is therefore plausible that serpentinization, in similarity with the sulphide-silicate reactions, has given rise to restricted amounts of magnetite in comparison to the amount of magnetite (or its precursor) which was deposited as a primary chemical precipitate.
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  • Resultat 51-60 av 229
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