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  • Metabolic systems  (2)
  • AIRCRAFT PROPULSION AND POWER  (1)
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Compartmental modelling based on methionine tolerance test data: a case study (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 223-229 
    Details
    ISSN: 1741-0444
    Keywords: Metabolic systems ; Modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A case study illustrates the application of systems theory to the analysis of data from nonrepeatable experiments with relatively few data points. The specific problem considered is the compartmental modelling in the human of the metabolic pathways of orally-administered methionine using tolerance test data. Attention is restricted to linear models, and concentrates on the determination of parsimonious structures (i.e. with as few parameters as possible) and their physiological interpretation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440933
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Adequacy of measurements in compartmental modelling of metabolic systems (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 216-222 
    Details
    ISSN: 1741-0444
    Keywords: Metabolic systems ; Modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The adequacy of present-day measurement techniques for the compartmental modelling of metabolic systems is investigated using numerical examples and analysis of experimentally-obtained plasma clearance curves. It is concluded that the model parameters obtained are often of questionable accuracy. The situation can be improved by careful monitoring of experimental conditions and judicious spacing of data points on the response curve, but the work shows a clear need for a continuous (or semicontinuous) method of monitoring plasma concentration. To resolve ambiguities between models equally plausible on physiological grounds, it is necessary to monitor the dynamics of internal variables, for example, of the concentration in the liver (which is nowadays possible noninvasively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440932
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Unknown
    Variable mixer propulsion cycle (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A design technique, method and apparatus are delineated for controlling the bypass gas stream pressure and varying the bypass ratio of a mixed flow gas turbine engine in order to achieve improved performance. The disclosed embodiments each include a mixing device for combining the core and bypass gas streams. The variable area mixing device permits the static pressures of the core and bypass streams to be balanced prior to mixing at widely varying bypass stream pressure levels. The mixed flow gas turbine engine therefore operates efficiently over a wide range of bypass ratios and the dynamic pressure of the bypass stream is maintained at a level which will keep the engine inlet airflow matched to an optimum design level throughout a wide range of engine thrust settings.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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