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

Sökning: LAR1:hh > (1980-1984)

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11.
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12.
  • Moore, R.L., et al. (författare)
  • Superluminal Acceleration in 3C345
  • 1983
  • Ingår i: Nature. - London, United Kingdom : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 306:5938, s. 44-46
  • Tidskriftsartikel (refereegranskat)abstract
    • The superluminal quasar 3C345 has a curved, one-sided jet-like radio structure1,2. Ejected material has been observed travelling at apparent speeds of 13–17c (ref. 3). We report here new observations at 22 GHz which show that the most recently ejected component4 is not moving radially away from the compact radio core, but along a trajectory which could be interpreted as either a curved path originating in the compact core, or a straight line, in which case the origin of ejection is not coincident with the compact radio core. The observations provide evidence of acceleration of this component. © 1983 Nature Publishing Group.
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13.
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14.
  • Romney, J., et al. (författare)
  • The milliarcsecond scale structure of low frequency variable sources
  • 1984
  • Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361 .- 1432-0746. ; 135:2, s. 289-299
  • Tidskriftsartikel (refereegranskat)abstract
    • VLBI observations were performed of 21 radio sources which exhibit low frequency variability. The integrated flux densities, variability indices at 0.4 GHz, optical magnitudes, redshifts, spectral indices at 0.4 GHz, and flux intensities with respect to a reference energy flux are provided. The VLBI data were synthesized from observatories located on different continents around the world. All structures were emitted from compact sources with sizes confined to milliarcsc scales. Nearly half displayed core-jet morphologies, while 28 percent had complex structures and 14 percent had either simple structures or were not resolvable. Further observations are proceeding at 400 mHz to confirm the presence of synchrotron electrons and magnetic fields ejected at relativistic speeds along the line of sight, which has the appearance of superluminal velocities.
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15.
  • Stannard, D., et al. (författare)
  • VLBI Observations of 3C345 at 1.67 GHz
  • 1980
  • Ingår i: Monthly notices of the Royal Astronomical Society. - Oxford : Oxford University Press. - 0035-8711 .- 1365-2966. ; 192:4, s. 555-560
  • Tidskriftsartikel (refereegranskat)abstract
    • VLBI observations of the quasar 3C 345 suggest that the milliarcsec subcomponents in the core have approximately equal intensities at 1.67 GHz. A new compact feature is detected in the inner jet structure at a distance of ∼ 12 m.arcsec from the core. © 1980 Royal Astronomical Society. Provided by the NASA Astrophysics Data System
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16.
  • Werner, Sven, 1952- (författare)
  • The heat load in district heating systems
  • 1984
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis considers the composition of the daily heat load in six Swedish district heating systems supplying heat for space heating and hot water supply. The analysis was performed by bringing together a heat load model and series of daily heat load observations covering periods ranging from five to eleven years.The influences of transient heat transmission, solar gain, and wind infiltration are found to be significant but small. It is shown that a natural self control of water radiators affects the magnitude of these influences when the control systems are incomplete. The annual fraction of each heat load component, the composition of the heat load duration graph, and the long term changes in heat consumption are presented.Furthermore, the heat load composition estimated facilitates future heat load simulations in order to quantify the outcome of various energy conservation measures with respect to reductions in design heat load and annual heat demand.
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  • Resultat 11-16 av 16

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