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  • Other Sources  (3)
  • 1985-1989  (3)
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  • 1987  (3)
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  • 1985-1989  (3)
  • 1970-1974
  • 1965-1969
  • 1940-1944
  • 1935-1939
Year
  • 1
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    Using output to evaluate and refine rules in rule-based expert systems (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The techniques described provide an effective tool which knowledge engineers and domain experts can utilize to help in evaluating and refining rules. These techniques have been used successfully as learning mechanisms in a prototype adaptive diagnostic expert system and are applicable to other types of expert systems. The degree to which they constitute complete evaluation/refinement of an expert system depends on the thoroughness of their use.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Marshall Space Flight Center, Third Conference on Artificial Intelligence for Space Applications, Part 1; p 9-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Performance and efficiency evaluation and heat release study of a direct-injection stratified-charge rotary engine (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A computer simulation which models engine performance of the Direct Injection Stratified Charge (DISC) rotary engines was used to study the effect of variations in engine design and operating parameters on engine performance and efficiency of an Outboard Marine Corporation (OMC) experimental rotary combustion engine. Engine pressure data were used in a heat release analysis to study the effects of heat transfer, leakage, and crevice flows. Predicted engine data were compared with experimental test data over a range of engine speeds and loads. An examination of methods to improve the performance of the rotary engine using advanced heat engine concepts such as faster combustion, reduced leakage, and turbocharging is also presented.
    Keywords: MECHANICAL ENGINEERING
    Type: SAE PAPER 870445
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Estimation of instantaneous heat transfer coefficients for a direct-injection stratified-charge rotary engine (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The main objective of this report was to derive equations to estimate heat transfer coefficients in both the combustion chamber and coolant pasage of a rotary engine. This was accomplished by making detailed temperature and pressure measurements in a direct-injection stratified-charge rotary engine under a range of conditions. For each sppecific measurement point, the local physical properties of the fluids were calculated. Then an empirical correlation of the coefficients was derived by using a multiple regression program. This correlation expresses the Nusselt number as a function of the Prandtl number and Reynolds number.
    Keywords: MECHANICAL ENGINEERING
    Type: SAE PAPER 870444
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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