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  • 1
    Electronic Resource
    Electronic Resource
    The influence of day and night work on the circadian variations of cardiovascular performance (1982)
    Springer
    European journal of applied physiology 48 (1982), S. 11-23 
    Details
    ISSN: 1439-6327
    Keywords: Cardiac performance ; Circadian rhythm ; Shift work
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Circadian variations of the pre-ejection period, Q-T interval, heart rate and oral temperature at rest and in day and night shift work were investigated. At rest, pronounced circadian variation was found in heart rate, pre-ejection period and Q-T interval. The ratio between Q-T interval and heart rate also shows a distinct circadian variation. When working, the rest rhythms of the variables were obscured. The physiological implications for shift work are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421160
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Robust Stabilization of Discrete-Time Uncertain Nonlinear Systems (1998)
    Springer
    Journal of optimization theory and applications 96 (1998), S. 87-107 
    Details
    ISSN: 1573-2878
    Keywords: H ∞-optimal control ; nonlinear systems ; uncertain systems ; absolute stabilizability ; structured uncertainty ; nonlinear S-procedure ; discrete-time systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper applies a recent result on nonlinear H ∞-optimal control to give a necessary and sufficient condition for the existence of a state feedback controller which absolutely stabilizes a discrete-time uncertain nonlinear system with structured uncertainty. The class of uncertain systems being considered contain uncertainties which satisfy a certain sum constraint. This sum constraint is a nonlinear discrete-time version of the integral quadratic constraint uncertainty description. The main result is established by using a nonlinear S-procedure result, which enables the robust absolute stabilization problem to be converted into a equivalent nonlinear H∞-optimal control problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022611116645
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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