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Träfflista för sökning "WFRF:(Luca R) srt2:(2000-2004)"

Sökning: WFRF:(Luca R) > (2000-2004)

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1.
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2.
  • Carbone, V, et al. (författare)
  • To what extent can dynamical models describe statistical features of turbulent flows?
  • 2002
  • Ingår i: Europhysics letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 58:3, s. 349-355
  • Tidskriftsartikel (refereegranskat)abstract
    • Statistical features of "bursty" behaviour in charged and neutral fluid turbulence are compared to statistics of intermittent events in a GOY shell model, and avalanches in different models of Self-Organized Criticality (SOC). It is found that inter-burst times show a power law distribution for turbulent samples and for the shell model, a property which is shared only in a particular case of the running sandpile model. The breakdown of self-similarity generated by isolated events observed in the turbulent samples is well reproduced by the shell model, while it is absent in all SOC models considered. On this base, we conclude that SOC models are not adequate to mimic fluid turbulence, while the GOY shell model constitutes a better candidate to describe the gross features of turbulence.
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4.
  • Cornwall, L. A., et al. (författare)
  • Authentication and authorization mechanisms for multi-domain grid environments
  • 2004
  • Ingår i: Journal of Grid Computing. - : Springer Science and Business Media LLC. - 1570-7873 .- 1572-9184. ; 2:4, s. 301-311
  • Tidskriftsartikel (refereegranskat)abstract
    • This article discusses the authentication and the authorization aspects of security in grid environments spanning multiple administrative domains. Achievements in these areas are presented using the EU DataGrid project as an example implementation. It also gives an outlook on future directions of development.
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5.
  • Gorini, Giuseppe, et al. (författare)
  • Neutron Emission from Beam-Injected Fast Tritons in JET Plasmas with Reversed or Monotonic Magnetic Shear.
  • 2004
  • Ingår i: 31st EPS Conference on Plasma Physics. ; , s. 4-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The neutron emission from fast tritons in plasmas with different magnetic shearconfigurations has been investigated in a dedicated experiment on JET. Short pulses ofneutral beam injection were used to deposit fast tritons in deuterium plasmas. By comparingthe measured neutron yield with predictions based on DT reaction calculations, fast tritonlosses can be assessed. The latter are expected to be very low according to neoclassicalpredictions based on Fokker-Planck simulation [1]. Much larger “anomalous” beam-ionlosses (up to 40%) have been reported in TFTR experiments for plasma conditions withreversed magnetic shear [2]. The TFTR experiments indicated an excess DT rate in thesimulation and, to a lesser extent, in the DD rate and plasma stored energy. This wasinterpreted as anomalous beam-ion loss associated with reverse shear due to an unidentifiedloss mechanism. Evidence of a similar effect was searched for in the JET experimentsreported in this paper.
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6.
  • Sorriso-Valvo, Luca, et al. (författare)
  • Intermittency in plasma turbulence
  • 2001
  • Ingår i: Planetary and Space Science. - 0032-0633 .- 1873-5088. ; 49:12, s. 1193-1200
  • Tidskriftsartikel (refereegranskat)
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  • Resultat 1-6 av 6

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