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  • Key words Animal  (1)
  • PACS: 77.80.Dj; 77.80.Fm; 75.10.Hk; 77.22.Ej  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamic hysteresis for Potts spin system: a Monte Carlo simulation (2000)
    Springer
    Applied physics 70 (2000), S. 113-120 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 77.80.Dj; 77.80.Fm; 75.10.Hk; 77.22.Ej
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A Monte Carlo approach based on the Q-state Potts model is developed to describe and simulate the dynamic hysteresis of Potts spin lattice against periodic time-varying external field E. The dynamic responses of the hysteresis loops against frequency ω of applied field and domain size R are studied. It is revealed that the hysteresis loops for the system energy W, polarization P, and domain wall fraction Π depend considerably on the frequency and domain size. The remnant polarization Pr shows a single-peak pattern as a function of ω. The P-E loop exhibits thin rhomb and fat rhomb patterns at low ω, whereas a tip-smoothed rhomb and roughly elliptical pattern is observed at high ω. The loop area can be scaled with Ω≈ω1/3 at low ω. The frequency dependency of the dynamic hysteresis is explained in terms of a simplified phenomenological model. At very small domain size, the dynamic hysteresis is significantly compressed, predicting the polarization weakening effect at small domain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050022
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  • 2
    Electronic Resource
    Electronic Resource
    Elastic pressure-volume curves of the respiratory system reveal a high tendency to lung collapse in young pigs (1999)
    Springer
    Intensive care medicine 25 (1999), S. 1140-1146 
    Details
    ISSN: 1432-1238
    Keywords: Key words Animal ; Porcine ; Mechanics ; Compliance ; Elastic recoil ; Recruitment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: To study pressure-volume (P/V) curves over a wide pressure and volume range in pigs.¶Design: Dynamic and static P/V curves (Pdyn/V and Pst/V) and compliance of the respiratory system were studied. The effects of recruitment, positive end-expiratory pressure (PEEP) and body position were analysed.¶Setting: Research animal laboratory.¶Materials: Seven anaesthetised, paralysed and ventilated healthy pigs of 21 kg.¶Measurements: P/V curves up to a pressure of about 40 cmH2O were recorded with a computer-controlled ventilator. Pst/V curves were obtained with the static occlusion method and Pdyn/V curves during an insufflation at a low, constant flow rate.¶Results: Pdyn/V recording showed a complex pattern. During the insufflation compliance increased, fell, increased and fell again. A 2nd ¶Pdyn/V recording immediately following the 1st one was displaced towards higher volumes and showed only one maximum of compliance. The difference between the two curves reflected: (1) lung collapse during a period of 5 min of ventilation at zero end-expiratory pressure (ZEEP) following a recruitment manoeuvre, (2) recruitment during the measurement of the 1st Pdyn/V curve. These observations were similar in the supine and in the left lateral position. After ventilation at PEEP, 4 cmH2O, the signs of collapse and recruitment were reduced. It was confirmed that PEEP offers a partial protection against collapse. Pst/V curves showed higher volumes and higher compliance values compared to Pdyn/V curves. This reflects the influence of viscoelastance on Pdyn/V curves.¶Conclusion: The study demonstrates a particularly strong tendency to lung collapse in pigs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001340051026
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    Paper (German National Licenses)
    Fulltext
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