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  • 1
    Electronic Resource
    Electronic Resource
    The crystal structure of the seramic superconductor of the Y−Ba−Cu−O compounds (1987)
    Springer
    The European physical journal 69 (1987), S. 29-31 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The crystal structure of one phase of superconductor Y−Ba−Cu−O Compound is analysed by RASA-5RP Four-circle single crystal diffractometer. It is found that the crystal is tetragonal with parametersa=3.8614 Å,b=3.8614 Å,C=11.6803 Å. In the crystal structure Ba situates at the Wyckoff (0, 0, 0.3094) position, Y at the special position (0, 0, 0), Cu ions occupy another special position (0.5, 0.5, 0.5) and the Wyckoff position (0.5, 0.5, 0.1391) with some substitution by Y and some Oxygen vacancies surrounding Cu and Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560606
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phase-Space Reconstructions and Stick-Slip (1997)
    Springer
    Nonlinear dynamics 13 (1997), S. 39-57 
    Details
    ISSN: 1573-269X
    Keywords: Phase-space reconstructions ; stick-slip ; method of delays ; friction oscillators ; nonsmooth systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Nonsmooth processes such as stick-slip may introduce problems with phase-space reconstructions. We examine chaotic single-degree-of-freedom stick-slip friction models and use the method of delays to reconstruct the phase space. We illustrate that this reconstruction process can cause pseudo trajectories to collapse in a way that is unlike, yet related to, the dimensional collapse in the original phase-space. As a result, the reconstructed attractor is not topologically similar to the real attractor. Standard dimensioning tools are applied in effort to recognize this situation. The use of additional observables is examined as a possible remedy for the problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008245332549
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Identifying Coulomb and Viscous Friction from Free-Vibration Decrements (1998)
    Springer
    Nonlinear dynamics 16 (1998), S. 337-347 
    Details
    ISSN: 1573-269X
    Keywords: Friction oscillator ; friction estimation ; friction identification ; Coulomb friction ; free vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This study focuses on an algorithm for the simultaneous identification of Coulomb and viscous damping effects from free-vibration decrements in a damped linear single degree-of-freedom (DOF) mass-spring system. Analysis shows that both damping effects can indeed be separated. Numerical study of a combined-damping system demonstrates a perfect match between the simulation parameters and the estimated values. Experimental study includes two types of real systems. The method is applied to an experimental industrial bearing. Experimental results are compared with numerical simulations to illustrate the reliability of this method. An analysis provides conservative bounds on error estimates. An example of the effect of quantization error on the estimations is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008213814102
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    Paper (German National Licenses)
    Fulltext
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