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  • 1
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 154 (1988), S. 895-901 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 205 (1994), S. 443-457 
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3539-3541 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental measurements and a single-mode analysis of a quantum-well laser diode subject to strong optical injection are combined to demonstrate that the diode follows a period-doubling route to chaos. All laser parameters used in this model, including the influence of spontaneous emission noise, were experimentally determined based on the four-wave mixing technique. The transition to chaos can be used to reduce the uncertainty in the value of the linewidth enhancement factor.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 8215-8217 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transparent single-phase rubidium titanyl phosphate (RTP) films having excellent crystalline properties have been deposited by excimer laser ablation method on (001)- and (010)-oriented potassium titanyl phosphate (KTP) substrates, respectively. X-ray θ-2θ scans and pole figures showed that the laser-ablated RTP films grew epitaxially on, and had exactly the same orientations of, the underlying KTP substrates. X-ray photoelectron spectroscopy analysis revealed that the RTP films prepared with this method are nearly stoichiometric. It appears to be possible to use these films as waveguides having sharp waveguide/substrate interfaces. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 6582-6587 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte–Carlo approach on the second phase precipitation in polycrystalline binary alloys is developed. The approach starts from the kinetic spin-exchange Ising model and the Q-state Potts model, and a coupling algorithm for simulation of both phase precipitation and domain growth is developed. The simulation on a simplified system with slow domain boundary migration reveals precipitation phenomena on the domain boundaries. The effect of domain boundaries on the morphology and kinetics of the second phase precipitates is investigated. It is shown that the scaling concept and the Lifshitz–Slyozov–Wagner law are broken in the present system. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5560-5565 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A measurement of electrical conductivity and Hall effect has been made for thin film La0.5Sr0.5CoO3−δ (LSCO) prepared on (001) SrTiO3 substrates by pulsed laser deposition under reduced oxygen pressures. A considerable effect of oxygen stoichiometry on electrical resistivity of LSCO thin films has been observed. The semiconducting behavior was observed as long as the sample was slightly oxygen deficient. The Hall effect measurements revealed a change ranging from four to six orders of magnitude in the carrier density, from 1019 to 1015 cm−3 at room temperature, and 1020–1012 cm−3 at ∼80 K for the films prepared inbetween 1 bar and 1 μbar O2. A chemical equilibrium approach of the interaction between oxygen vacancies and hole carriers was used to explain the measured data. The results were compared with the microstructural measurements, yielding an empirical relation between the lattice expansion along c-axis and oxygen vacancies for LSCO films. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2587-2589 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The phase and amplitude characteristics of nearly degenerate four-wave mixing in a semiconductor laser are studied. The experimental data can be quantitatively understood with a theoretical analysis in terms of the phase and amplitude modulations caused by mixing between the optical fields in the injected laser.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3570-3576 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements are presented of electron heat transport with non-Maxwellian (flattopped) distributions due to inverse bremsstrahlung absorption of intense microwaves in the University of California at Davis Aurora II device [Rogers et al., Phys. Fluids B 1, 741 (1989)]. The plasma is created by pulsed discharge in a cylindrical vacuum chamber with surface magnets arranged to create a density gradient. The ionization fraction (∼1%) is high enough that charged particle collisions are strongly dominant in the afterglow plasma. A short microwave pulse (∼2 μs) heats a region of the afterglow plasma (ne/ncr≤0.5) creating a steep axial (LT∼1–10λei) temperature gradient. Langmuir probes are used to measure the relaxation of the heat front after the microwave pulse. Time and space resolved measurements show that the isotropic component of the electron velocity distribution is flat topped (∼exp[−(v/vm)m], m(approximately-greater-than)2) in agreement with Fokker–Planck calculations using the measured density profile. Classical heat transport theory is not valid both because the isotropic component of the electron velocity distribution is flattopped and the temperature gradients are very steep.
    Type of Medium: Electronic Resource
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