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Träfflista för sökning "WFRF:(Stefanova E.) srt2:(2000-2004)"

Search: WFRF:(Stefanova E.) > (2000-2004)

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1.
  • Stefanova, E. A., et al. (author)
  • Four-quasiparticle alignments in Ge-66
  • 2003
  • In: Acta Physica Polonica B. - 0587-4254 .- 1509-5770. ; 34:4, s. 2237-2240
  • Journal article (peer-reviewed)abstract
    • Above angular momentum 10(+), we found two positive-parity sequences, connected by energetically staggered DeltaI = 1 M1 transitions. The total Routhian surface calculations predict a strong triaxial deformation for them. To our knowledge, this is the first observation of staggered M1 transitions in a deformed four-quasiparticle pi(g(9/2)(2))v(g(9/2)(2)) regime.
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2.
  • Stefanova, E. A., et al. (author)
  • Four-quasiparticle alignments in Ge-66
  • 2003
  • In: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 67:5
  • Journal article (peer-reviewed)abstract
    • The neutron-deficient nucleus Ge-66 was populated at high spin in two experiments using the reaction Ca-40(S-32,alpha2p) at beam energies of 105 and 95 MeV. In the first experiment, a self-supporting Ca-40 target was used, while a gold-backed target of similar thickness was used in the second experiment. gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The level scheme of Ge-66 was extended up to Eapproximate to18 MeV and I-pi=(23(-)). Above angular momentum 10(+), we found two sequences, connected by energetically staggered DeltaI=1 M1 transitions. The total Routhian surface calculations describe Ge-66 at lower spins as a gamma-soft nucleus having a moderate deformation of beta(2)approximate to0.23, while a triaxial deformation is predicted for the band structures above I-pi=10(+). To our knowledge, this is the first observation of staggered M1 transitions in a deformed four-quasiparticle pi(g(9/2)(2))nu(g(9/2)(2)) structure.
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  • Minkova, V., et al. (author)
  • Thermochemical treatment of biomass in a flow of steam or in a mixture of steam and carbon dioxide
  • 2000
  • In: Fuel processing technology. - 0378-3820 .- 1873-7188. ; 62:1, s. 45-52
  • Journal article (peer-reviewed)abstract
    • Simultaneous pyrolysis and gasification of biomass samples of different origin is performed in a flow of steam or in a mixture of steam and carbon dioxide. Wastes from birch wood, olive stones, bagasse, and pellets from straw and Miscanthus are used as feedstock. The raw materials are heated with 10 degrees C/min to 750 degrees C at atmospheric pressure and kept for a period of 2 h at this temperature, Laboratory experimental equipment with a horizontal rotating stainless steel reactor is used. The oxygen-containing functional groups in the solid products (-COOH, =CO and -OH) are determined using the method of Boehm. The results are compared with those obtained in treatment in inert atmosphere as well as with those obtained in a stationary reactor. The rotating pyrolysis reactor seems suitable for production of energy-rich gaseous products and activated carbons.
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