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Träfflista för sökning "WFRF:(Jonsson J. J.) srt2:(1990-1994)"

Sökning: WFRF:(Jonsson J. J.) > (1990-1994)

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  • Ahlstrom, R., et al. (författare)
  • School children's preferences for food combinations
  • 1990
  • Ingår i: Food Quality and Preference. - 0950-3293 .- 1873-6343. ; 2:3, s. 155-165
  • Tidskriftsartikel (refereegranskat)abstract
    • Students from the 4th, 8th and 11th grades (N = 177) expressed their opinions as to which foodstuffs belong together in a meal. They did this by selecting and grouping cards that depicted the names and pictures of 25 foodstuffs typically offered in their school lunches. Subjects were allowed to create up to 10 different meals under one of four instructions. The cards were dispensed from a specially designed box that could hold single or multiple copies of each food item. Younger students created significantly more meals with few components than did the older students. The types of foodstuffs selected and their groupings were highly similar across grades and for both boys and girls. The meals tended to correspond to those actually available in the school lunch program, but more than 50% of the creations were unique in that each of them was produced by one or two students. These findings suggest that school nutritionists and administrators should strive for maximum variety in their lunch menus. © 1991.
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9.
  • Bengtsson, G. J, et al. (författare)
  • Time-resolved Spectroscopic Studies of the 7p 2p States of Neutral Silver Following Vuv Excitation
  • 1991
  • Ingår i: Zeitschrift für Physik D Atoms, Molecules and Clusters. - 0178-7683. ; 22:1, s. 437-439
  • Tidskriftsartikel (refereegranskat)abstract
    • The radiative lifetimes of the 7 p2P3/2, 1/2 states of silver and the hyperfine structure of the 7 p2P3/2 state have been measured using pulsed laser excitation and direct observation of the induced fluorescence light decay. In order to excite this doublet, VUV radiation at 185 nm was applied, as generated by frequency tripling and anti-Stokes Raman shifting of the output of a Nd: YAG laser pumped dye laser. The lifetimes were found to be tau = 255(20) ns and tau = 285(25) ns for the J = 3/2 state and J = 1/2 state, respectively. The hyperfine structure of the 7 p2P3/2 state was measured by the quantum beat method. The magnetic dipole interaction constant for the Ag-107 isotope was found to be a = - 4.5(2) MHZ.
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  • Carlsson, J, et al. (författare)
  • Large Multiconfigurational Hartree-fock Calculations On the Hyperfine-structure Constants of the Li-7 2s 2s and 2p 2p States
  • 1992
  • Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 46:5, s. 2420-2425
  • Tidskriftsartikel (refereegranskat)abstract
    • Accurate hyperfine-structure parameters for the ground and first excited states of lithium are reported. Hyperfine parameters are calculated from multiconfiguration Hartree-Fock (MCHF) wave functions using a recently written hyperfine-structure program, being a part of the MCHF Atomic Structure Package. Convergence of the hyperfine-structure parameters is studied as the active set of orbitals is increased. The relativistic, finite-nuclear-size, and finite-nuclear-mass-corrected values of the magnetic hyperfine-structure constants of the 2s S-2(1/2) and 2p P-2(1/2,3/2) states of Li-7 were determined to be A1/2=401.70 MHz and A1/2=45.94 MHz, A3/2=3.098 MHz, respectively. The final values are compared with experiments and with the most reliable theoretical values obtained with other methods.
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