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Sökning: L773:0028 0836 OR L773:1476 4687 > (1980-1989) > (1988)

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  • Hansen, Staffan, et al. (författare)
  • Oxidation Catalysis on YBa2Cu3O6 + x
  • 1988
  • Ingår i: Nature. - Nature Publishing Group. - 0028-0836. ; 334:6178, s. 143-145
  • Tidskriftsartikel (refereegranskat)abstract
    • Mild oxidation catalysts are used to product a wide range industrial chemicals from hydrocarbons, whereas deep oxidation catalysts yield CO2 and are becoming important in the cleaning of emissions from combustion of carbonaceous fuels. Here we report on a catalyst1 that facilitates both mild and deep oxidation of toluene in the presence of molecular oxygen and ammonia. At low partial pressures of O2a YBa2Cu3O6+x catalyst is very active in the formation of benzonitrile, but at higher O2 partial pressures it preferentially catalyses formation of CO2. This sharp transition in product selectivity is reversible and occurs at a defined partial pressure of O2. At transition the bulk compostition of the catalyst is close to YBa2Cu3O6 (x≈0). Increasing the content of lattice oxygen (x > 0) makes the catalyst selective for CO2 formation
  • Zensus, J. A., et al. (författare)
  • The inner radio jet of 3C273
  • 1988
  • Ingår i: Nature. - London : Nature Publishing Group. - 0028-0836. ; 334:6181, s. 410-412
  • Tidskriftsartikel (refereegranskat)abstract
    • Radio maps of 3C273 obtained with very long baseline interferometry (VLBI) have been limited by low dynamic range and poor north-south resolution resulting from the low declination (2°) of this quasar1. Dramatic improvement can now be achieved using larger arrays and antennas in the Southern Hemisphere2,3. A new VLBI map, made at 5 GHz with angular resolution and dynamic range unsurpassed at this frequency for this source, shows a narrow jet extending to a projected distance lproj∼125 h-;1 parsecs from the core. Superluminal motion exists out to at least lproj≈46h-1 parsecs. Successive superluminal components emerge from the core and appear to move on a fixed curved path with similar speeds of about 1 milliarcseconds per year. © 1988 Nature Publishing Group.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
Zensus, J. A. (1)
Bååth, L.B., 1948-, (1)
Andersson, Arne, (1)
Bovin, JO (1)
Hansen, Staffan, (1)
Cohen, M. H. (1)
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Otamiri, J (1)
Nicolson, G. D., (1)
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