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  • Polymer and Materials Science  (1)
  • local controllability  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Multiple local solutions to nonlinear control processes (1990)
    Springer
    Journal of optimization theory and applications 67 (1990), S. 463-485 
    Details
    ISSN: 1573-2878
    Keywords: Perturbed linear control processes ; Nielsen fixed-point theory ; local controllability ; Leray-Schauder condition ; retractability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We use the topological tool of Nielsen fixed-point theory to study the controllability of perturbed linear control processes whose control space can be reduced to a finite-dimensional one. These methods produce a lower bound on the number of controls that achieve a given target. We concentrate particularly on the case where the perturbation has sublinear growth, and we exhibit examples of multiple controls of various types that are detected by the Nielsen theory method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939645
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  • 2
    Electronic Resource
    Electronic Resource
    In vivo and in vitro aging of orthopedic aluminas (1983)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 17 (1983), S. 395-410 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The flexural strength, microstructure and relative Ca and Si concentration at the surface of two commercial orthopedic aluminas were studied before and after aging up to 52 weeks in simulated body fluids or in subcutaneous implantation in rodents. There was no significant reduction in flexural strength after aging, but there was evidence of Ca and Si dissolution from the external grain boundary surfaces, particularly for specimens aged in demineralized water. No change occurred in the Ca and Si concentrations within the specimen's bulk during either in vivo or in vitro aging.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820170302
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