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Träfflista för sökning "WFRF:(Robert C) srt2:(1981-1984)"

Sökning: WFRF:(Robert C) > (1981-1984)

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1.
  • Alfvén, Hannes, et al. (författare)
  • Human IQ vs Nuclear IQ
  • 1981
  • Ingår i: Bulletin of the atomic scientists. - : Educational Foundation for Nuclear Science. - 0096-3402 .- 1938-3282. ; 37:1, s. 4-5
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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2.
  • Petersen, Robert C., et al. (författare)
  • Influence of velocity and food availability on catchnet dimensions of Neureclipsis bimaculata (Trichoptera: Polycentropodidae)
  • 1984
  • Ingår i: Holarctic Ecology. - 0105-9327. ; 7:4, s. 380-389
  • Tidskriftsartikel (refereegranskat)abstract
    • Larvae of Neureclipsis bimaculata (Trichoptera: Polycentropodidae) construct elaborate catchnets in lotic habitats to trap small drifting invertebrate prey. Three populations located at two oligotrophic and one eutrophic site were studied in southern Sweden. Measurements were made of larval weight, net size, seston quality and quantity, and stream velocity.Neureclipsis larvae alter their net dimensions in response to both velocity and seston concentration. This was determined by comparing net structure and seston at the three locations. Larvae from the eutrophic, high quality seston site attain a significantly (P < 0.001) heavier instar V dry weight, spin a smaller catchnet, filter a volume of water dependent on body size, and slightly alter their catchnet dimensions with velocity. Larvae from the two oligothrophic sites are significantly smaller than those from the eutrophic site, spin a larger net at comparable velocities, filter a larger volume of water at comparable weights, and alter net dimensions with velocity.Estimates of silk production indicate that the net cost is minimized by spinning a very fine silken strand and by adding silk over a period of time. The cost while large is offset by a large capture rate of prey.The structure of Neureclipsis nets appears to be the result of a trade-off between maximizing food capture and minimizing hydraulic stress on the net.
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3.
  • Sahlin, Nils-Eric, et al. (författare)
  • The role of second-order probabilities in decision making
  • 1983
  • Ingår i: Analysing and Aiding Decision Processes. - 0166-4115. - 9780444865229 ; 14, s. 455-467
  • Bokkapitel (refereegranskat)abstract
    • The importance, legitimacy and role of second-order probabilities are discussed. Two descriptive models of the use of second-order probabilities in decisions are presented. The results of two empirical studies of the effects of second-order probabilities upon the rank orderings of bets are summarized briefly. The bets were of three basic types and involved a wide variety of first- and second-order probabilities as subjectively assessed by the subjects. Support was obtained for the assumption that the majority of subjects make use of the one model or the other. It is suggested that greater attention should be paid to second-order probabilities, both from a normative and descriptive standpoint.
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