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  • 32.70.Fw  (1)
  • Circulation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopy and dynamics of neutral atoms in superfluid helium (1995)
    Springer
    The European physical journal 98 (1995), S. 353-357 
    Details
    ISSN: 1434-6036
    Keywords: 32.30.Jc ; 32.70.Fw ; 67.40.Yv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optical spectra and radiative lifetimes of neutral atoms in superfluid helium have been studied. The absorption and emission spectra of Ag, Mg, Yb, Al, Ga, and In were found to exhibit shifts and broadening typical of atoms residing in microscopic He bubbles, showing that this type of trapping is fairly general. The radiative lifetimes measured for these atoms are close to the free space values, indicating that the surrounding bubble hardly perturbs the electronic orbitals during photo emission. One exception observed in Sr is discussed, where competing autoionization substantially decreases the lifetime of a high excited triplet state. A transient non-bubble state with sharp, free atom like spectra is seen during the first few μs after dispersion for many atomic species. The dynamics of this state are unusual, with for example very short radiative lifetimes measured for light alkali atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338404
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Physiological and psychological indices of fatigue during static contractions (1983)
    Springer
    European journal of applied physiology 50 (1983), S. 179-193 
    Details
    ISSN: 1439-6327
    Keywords: Static exercise ; Fatigue ; Electromyography ; Circulation ; Perceived effort
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The development of fatigue and the relationship between psychological and physiological indices of fatigue were studied in a group of 18 male subjects during static contractions. Exercise was performed as a static elbow flexion at 25% MVC. Heart rate (HR), intraarterial blood pressure (BP) and surface EMG [mean amplitude (MA) and central frequency (CF)] were studied during contractions sustained until exhaustion. The amount of effort expended (relative to total exhaustion) and the rating of perceived pain were recorded following contractions interrupted after 20, 30 ⋯ 80, and 100% of endurance time. HR, BP and EMG amplitude responses were similar to those previously recorded. The decline in CF occurred in two phases, possibly related to a change in motor unit recruitment after the initial 70% of endurance time. The subjects overestimated the amount of effort expended and thus underestimated their endurance capacity. The best correlation between perceived effort and physiological responses was obtained using blood pressure data, whereas changes in EMG data did not parallell the psychological responses. It is concluded that the perception of effort during a static contraction is produced through a complex process, in which several influences of peripheral and central origin are integrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422157
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    Paper (German National Licenses)
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