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- Lundqvist, Anna, et al.
(författare)
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Neuropsychological Aspects of Driving After Brain Lesion: Simulator Study and On-Road Driving
- 1997
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Ingår i: Applied neuropsychology. - : Informa UK Limited. - 0908-4282 .- 1532-4826. ; 4:4, s. 220-230
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Tidskriftsartikel (refereegranskat)abstract
- 29 patients with brain lesion and 29 matched controls completed a neuropsychological test battery to assess perceptual, cognitive, and executive functioning and were tested on driving performance in a simulator and actual road conditions. The patients were socially well recovered with a high rate of employment. Patients performed significantly worse than controls on the test battery, especially on executive and cognitive functions. Patients drove as well as controls in predictable situations in the advanced simulator used In unpredictable situations, patients demonstrated longer reaction time (RT) and safety margins, as well as difficulties in allocating processing resources to a secondary task. Patients showed significantly less attention, worse traffic behavior, and less risk awareness when driving in real traffic. 41% of the patients did not pass the driving test. The neuropsychological test battery was factor analyzed into 4 factors: executive capacity, cognitive capacity, automatic attentional capacity, and simple perceptual-motor capacity. The second factor was the most significant, with a simultaneous capacity test predicting driving performance with 78% confidence.
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- Lundqvist, Björn, et al.
(författare)
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Cutoff of the vortex-glass behavior in Tl(2)Ba(2)CaCu(2)O(8+delta) superconducting thin films
- 1998
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 58:10, s. 6580-6584
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Tidskriftsartikel (refereegranskat)abstract
- The vortex dynamics of a Tl(2)Ba(2)CaCu(2)O(8+delta) thin film has been measured by electrical resistivity and I-V characteristics. The temperature T*(B) defined from a vortex-glass analysis of the resistivity in the vortex liquid state using the Vogel-Fulcher relation is shown to be consistent with a vortex-glass-like scaling of the I-V characteristics in the high dissipation regime. Below T*, there is however a significant temperature range in which the flux creep does not vanish at low currents. This suggests that the transition into a glassy vortex state is cut off at some length scale.
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- Lundqvist, Björn, et al.
(författare)
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Empirical scaling of the vortex glass line above 1T for high-T(c) superconductors of varying anisotropy
- 1998
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 57:22, s. 14064-14067
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Tidskriftsartikel (refereegranskat)abstract
- The resistive transition into a glassy vortex state in oxygen-deficient YBa(2)CU(3)O(7-delta) twinned single crystals of varying anisotropy gamma (8.7 less than or equal to gamma less than or equal to 35) has been studied with an applied magnetic field along the crystallographic c axis. For B greater than or similar to 1T, the glass. line is well described by the empirical relation B(g)=B(o)[(1 -T/T(c))/(T/T(c))](alpha), where alpha approximate to 1 and B(o) approximate to 1.85 Phi(o)/(gamma d)(2). The successful fit to this relation both below and above an alleged crossover in the solid vortex state has important consequences for the H-T phase diagram of high-temperature superconductors.
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- Lundqvist, Björn, et al.
(författare)
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Vortex dynamics in a thin film of Tl2Ba2CuO6
- 1999
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Ingår i: Journal of Low Temperature Physics. - 0022-2291 .- 1573-7357. ; 117:5-6, s. 1441-1445
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Tidskriftsartikel (refereegranskat)abstract
- The vortex dynamics in a Tl2Ba2CuO6 (Tl-2201) thin film with a critical temperature T-c = 80.8 K has been studied by electrical resistivity measurements for magnetic fields 0 less than or equal to B less than or equal to 12 T. The vortex glass line, as determined from the disappearance of linear resistivity, was found to be well described by B-g (T) = B-0[(1 - T/T-c)/(T/T-c)(alpha), with B-0 approximate to 0.65 T and alpha approximate to 1.9. The glass line of Tl-2201 is observed to be located below the one of Tl2Ba2CaCu2O8+delta (Tl-2212) in a magnetic phase diagram based on a reduced temperature scale T/T-c, thus suggesting a higher anisotropy for Tl-2201.
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- Lundqvist, Björn, et al.
(författare)
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Vortex dynamics in different magnetic field directions of untwinned YBa2Cu3O7-delta single crystals
- 1996
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Ingår i: Czechoslovak Journal of Physics. - 0011-4626 .- 1572-9486. ; 46:Suppl. 3, s. 1705-1706
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Tidskriftsartikel (refereegranskat)abstract
- Current-Voltage (I-V) characteristics have been measured on an untwinned single crystal of YBa2Cu3O7-delta with the current along the b-axis and with the applied magnetic field along various crystallographic axes. Measurements with the magnetic field in the ab-plane resulted in a different qualitative behaviour of the I-V characteristics than for the field applied along the c-axis.
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- Lundqvist, Björn, et al.
(författare)
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Vortex dynamics in oxygen deficient single crystals of YBa2Cu3O7-delta
- 1997
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Ingår i: Physica. C, Superconductivity. - 0921-4534 .- 1873-2143. ; 282, s. 1959-1960
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Tidskriftsartikel (refereegranskat)abstract
- In YBa2Cu3O7-delta (YBCO), oxygen deficiencies in the CuO chains change the coupling between the charge carriers in adjacent superconducting CuO2 planes and thereby the electrical anisotropy, gamma=(m(c)/m(ab))(1/2). Such crystals therefore provide a simple test system for systematic studies of the influence of anisotropy on vortex dynamics. We have studied the vortex glass transition of YBCO single crystals with delta in the range of 0.07 to 0.27, corresponding to gamma between 9 and 18, for magnetic fields 0
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