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  • AIRCRAFT STABILITY AND CONTROL  (4)
  • Acidic deposition  (1)
  • COMMUNICATIONS  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Emergence chronology of brook charr,Salvenus fontinalis, alevins in an acidic stream (1991)
    Springer
    Environmental biology of fishes 31 (1991), S. 25-31 
    Details
    ISSN: 1573-5133
    Keywords: Acidic deposition ; Snowmelt runoff ; Stream pH depressions ; Early life history ; Salmonid fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The emergence chronology of brook charr alevins in the Chikanishing River, Ontario, Canada and the concurrent changes in stream chemistry resulting from acidic snowmelt runoff were examined during the spring, 1986–1988. Emergence patterns were similar among years with the most intense emergence (〉 70%) occurring during the declining stream discharge following the spring flood. This period coincided with stream pH depressions (minimum pH 5.2) in 2 of 3 years, suggesting emergence behaviour frequently subjects the earliest free-swimming life interval of brook charr to episodic acidification events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002155
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Flight-determined aerodynamic derivatives of the AD-1 oblique-wing research airplane (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The AD-1 is a variable-sweep oblique-wing research airplane that exhibits unconventional stability and control characteristics. In this report, flight-determined and predicted stability and control derivatives for the AD-1 airplane are compared. The predictions are based on both wind tunnel and computational results. A final best estimate of derivatives is presented.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2222 , H-1179 , NAS 1.60:2222
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    In-flight total forces, moments and static aeroelastic characteristics of an oblique-wing research airplane (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A low-speed flight investigation has provided total force and moment coefficients and aeroelastic effects for the AD-1 oblique-wing research airplane. The results were interpreted and compared with predictions that were based on wind tunnel data. An assessment has been made of the aeroelastic wing bending design criteria. Lateral-directional trim requirements caused by asymmetry were determined. At angles of attack near stall, flow visualization indicated viscous flow separation and spanwise vortex flow. These effects were also apparent in the force and moment data.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2224 , H-1181 , NAS 1.60:2224
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Reliability analysis of an ultra-reliable fault tolerant control system (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report analyzes the reliability of NASA's Ultra-reliable Fault Tolerant Control System (UFTCS) architecture as it is currently envisioned for helicopter control. The analysis is extended to air transport and spacecraft control using the same computational and voter modules applied within the UFTCS architecture. The system reliability is calculated for several points in the helicopter, air transport, and space flight missions when there are initially 4, 5, and 6 operating channels. Sensitivity analyses are used to explore the effects of sensor failure rates and different system configurations at the 10 hour point of the helicopter mission. These analyses show that the primary limitation to system reliability is the number of flux windings on each flux summer (4 are assumed for the baseline case). Tables of system reliability at the 10 hour point are provided to allow designers to choose a configuration to meet specified reliability goals.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-CR-166594 , NAS 1.26:166594 , REPT-8404-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Nonlinear estimation with quantized measurements - PCM predictive quantization, and data compression (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Nonlinear estimation with quantized measurements and application to pulse code modulation, data compression, and predictive quantization
    Keywords: COMMUNICATIONS
    Type: NASA-CR-97197 , RE-45
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Flight-determined stability and control derivatives for the F-111 Tact research aircraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A flight investigation was conducted to provide a stability and control derivative data base for the F-111 transonic aircraft technology research aircraft. Longitudinal and lateral-directional data were obtained as functions of Mach number, angle of attack, and wing sweep. For selected derivatives, the flight results were correlated with derivatives calculated based on vehicle geometry. The validity of the angle of attack measurement was independently verified at a Mach number of 0.70 for angles of attack between 3 and 10 degrees.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-1350 , H-1004
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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