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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "Epitaxial growth of RbTiOPO4 films on KTiOPO4 substrates by excimer laser ablation technique'' [J. Appl. Phys. 76, 8215 (1994)] (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5487-5487 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359608
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  • 3
    Electronic Resource
    Electronic Resource
    A Monte–Carlo approach to domain boundary precipitation in binary alloys (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 6582-6587 
    Details
    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
    URL: http://dx.doi.org/10.1063/1.368976
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of oxygen stoichiometry on the electrical property of thin film La0.5Sr0.5CoO3 prepared by pulsed laser deposition (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5560-5565 
    Details
    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
    URL: http://dx.doi.org/10.1063/1.368600
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  • 5
    Electronic Resource
    Electronic Resource
    Frequency response and scaling of hysteresis for ferroelectric Pr(Zr0.52Ti0.48)O3 thin films deposited by laser ablation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5198-5202 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ferroelectric hysteresis response against periodically varying electric field over frequency range of 10−2–105 Hz and amplitude range of 2–45 kV/cm for YBa2Cu3O7 (YBCO)/ Pb(Ti0.48Zr0.52)O3 (PZT)/YBCO thin film capacitors prepared by laser ablation is measured by utilizing the Sawyer–Tower circuit. Given amplitude Δ of the field, the hysteresis area 〈A〉 first grows and then decays as a function of frequency cursive-phi. At low and high ranges of frequency, 〈A〉 can be scaled as 〈A〉∝cursive-phi1/3Δ2/3 and 〈A〉∝cursive-phi−1/3Δ, respectively. It is established that the dynamic hysteresis at the high frequency range for a PZT thin film capacitor does not follow the theoretically predicted scaling law. An empirical scaling law 〈A〉∝cursive-phi1/3(Δ−Δ0)2/3/(1+bcursive-phi2/3Δ−1/3) with Δ0 the critical field and b a constant, is proposed to characterize the frequency and amplitude dependence of the hysteresis area over all the frequency range. In addition, the remnant polarization Pr and coercive field Ec as functions of cursive-phi are investigated, respectively, revealing a single-peaked pattern of both Pr and Ec. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371500
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  • 6
    Electronic Resource
    Electronic Resource
    The large magnetoresistance property of La0.5Sr0.5CoO3−x thin films prepared by pulsed laser deposition (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1047-1049 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality (001) thin film La0.5Sr0.5CoO3−x (LSCO) has been prepared on (001) SrTiO3 substrates by pulsed laser deposition under different oxygen pressures with and without postannealing. C-axis expansion of the LSCO with reducing oxygen pressure was revealed. The electrical resistivity increased over five orders of magnitude when oxygen pressure varied from 1.0 mbar (plus postannealing) to 10−3 mbar. The negative magnetoresistance (n-MR) property as a function of temperature and oxygen pressure was investigated. Linear dependence of the n-MR ratio on magnetic field and temperature was found and significant effect of oxygen stoichiometry on the n-MR was demonstrated. The film prepared at 650 °C and 0.1 mbar oxygen shows a n-MR ratio of −16% at 81 K under a field of only 0.2 T. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122080
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  • 7
    Electronic Resource
    Electronic Resource
    Physical characteristics of band-gap engineered, photovoltaic detectors (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4637-4646 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A comprehensive understanding of the physics of a graded band-gap, photovoltaic detector has been achieved through a full scale finite difference simulation of the semiconductor equations and the Poisson equation in time and space. The results show that three characteristic times, Maxwell's dielectric relaxation time, the electron transit time across a graded device period, and the minority electron lifetime, govern the transient response of the device completely. Varying device parameters to control these characteristic times will enable tailoring of device structures to optimize responsivities for applications requiring picosecond to nanosecond response speeds. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366202
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  • 8
    Electronic Resource
    Electronic Resource
    Instabilities and chaos in optically injected semiconductor lasers (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2780-2782 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have experimentally obtained and theoretically analyzed a systematic map of the various instabilities induced in a semiconductor laser subject to strong optical injection as the amount of optical injection power and frequency detuning is varied. Two distinct islands of chaos have been identified in the injection-locked region. They are separated by regions of period one and period two solutions. Spontaneous emission noise obscures the observation of high periodic orbits. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114591
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  • 9
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition of perovskite La0.5Sr0.5MnO3/La0.7Sr0.3CoO3 multilayers and their magnetotransport properties (1999)
    Springer
    Applied physics 69 (1999), S. S663 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 75.70.Cn; 72.60.Tg; 73.50.Jt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The perovskite La0.5Sr0.5MnO3-δ/La0.7Sr0.3CoO3-δ (LSMO/LSCO) bilayers and LSMO/LSCO/LSMO trilayers are fabricated by pulsed laser deposition and their magnetic and magnetoresistive properties are investigated. The “waist”-like magnetic hysteresis for both the bilayer and trilayer is explained in terms of the inter-layer exchange coupling model based on the large difference in coercivity between LSCO and LSMO layers. The shrink of hysteresis with temperature is attributed to the temperature dependence of the magnetic crystalline anisotropy and conduction band width W. We observe smoothed remnant resistance of the multilayers over a rather wide temperature range (〉100 K), while the magnetoresistance (MR) is not seriously damaged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051500
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition of ZnO as conductive buffer layer of (001)-LiNbO3 thin films (1998)
    Springer
    Applied physics 67 (1998), S. 493-497 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 81.40.-z; 73.50.-h; 78.20.-e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 1 (LO) mode peak at 579 cm-1, indicating oxygen deficiency in the films. Significant dependence of the electrical property for the films on substrate temperature was shown. The I–V relation of the films exhibited non-ohmic behavior. Whereas the films deposited above 500 °C showed a metal-like property, at a lower substrate temperature semiconducting thin films were achieved. The (001)-oriented LiNbO3/ZnO heterostructure was successfully prepared on quartz fused and (001) sapphire plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050809
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