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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and parameters of new populations of meat-type chickens (1984)
    Springer
    Theoretical and applied genetics 69 (1984), S. 23-30 
    Details
    ISSN: 1432-2242
    Keywords: Meat-type chickens ; Synthetic populations ; Parameters ; Broiler traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sire and dam populations of meat-type chickens were developed at the Animal Research Centre, Ottawa to provide unselected control populations suitable for modern broiler research, estimate genetic parameters of broiler traits, and initiate selection experiments. The populations were synthesized from 16 commercial broiler parent stocks (nine sire and seven dam stocks) during two generations of crossbreeding and one generation of random mating. The estimated genetic contribution per stock to the respective population ranged from 8.3 to 16.7% for autosomal genes, from 5.5 to 17.8% for genes on Z chromosomes, and from 0 to 25.0% for genes on W chromosomes. Genetic differences among the original stocks had not been fully diffused among individuals within the populations at the time parameters were estimated. Consequently, genetic parameter estimates are probably slightly biased. Estimated heritabilities of broiler traits in these populations were generally high, 0.39 to 0.63. Hence, rapid genetic change of these traits is possible. The genetic correlation between 28 to 49 day feed efficiency and corresponding weight gain was 0.69 and between feed efficiency and abdominal fat percentage was -0.68. Increasing body weight gain, improving feed efficiency and reducing abdominal fatness of broilers by selection appears feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262532
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Self-control and political ideology [Psychological and Cognitive Sciences] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-07-08
    Description: Evidence from three studies reveals a critical difference in self-control as a function of political ideology. Specifically, greater endorsement of political conservatism (versus liberalism) was associated with greater attention regulation and task persistence. Moreover, this relationship is shown to stem from varying beliefs in freewill; specifically, the association between political...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 3
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    Curved-flow, rolling-flow, and oscillatory pure-yawing wind-tunnel test methods for determination of dynamic stability derivatives (1981)
    In:  CASI
    Details
    Publication Date: 2011-10-14
    Description: The test capabilities of the Stability Wind Tunnel of the Virginia Polytechnic Institute and State University are described, and calibrations for curved and rolling flow techniques are given. Oscillatory snaking tests to determine pure yawing derivatives are considered. Representative aerodynamic data obtained for a current fighter configuration using the curved and rolling flow techniques are presented. The application of dynamic derivatives obtained in such tests to the analysis of airplane motions in general, and to high angle of attack flight conditions in particular, is discussed.
    Keywords: AERODYNAMICS
    Type: AGARD Dyn. Stability Parameters; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Stability and control characteristics of STOL and V/STOL airplanes (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Stability, control, and handling quality characteristics of STOL and V/STOL airplanes
    Keywords: AIRCRAFT
    Type: PERFORMANCE AND DYN. OF AEROSPACE VEHICLES 1971; P 1-69
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Aerodynamic characteristics at high angles of attack (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An overview is presented of the aerodynamic inputs required for analysis of flight dynamics in the high-angle-of-attack regime wherein large-disturbance, nonlinear effects predominate. An outline of the presentation is presented. The discussion includes: (1) some important fundamental phenomena which determine to a large extent the aerodynamic characteristics of airplanes at high angles of attack; (2) static and dynamic aerodynamic characteristics near the stall; (3) aerodynamics of the spin; (4) test techniques used in stall/spin studies; (5) applications of aerodynamic data to problems in flight dynamics in the stall/spin area; and (6) the outlook for future research in the area.
    Keywords: AERODYNAMICS
    Type: Von Karman Inst. for Fluid Dyn. Aerodyn. Inputs for Probl. in Aircraft Dyn., Vol. 2; 39 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Results of piloted simulator studies of fighter aircraft at high angles of attack (1978)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The experience gained at the NASA Langley Research Center during the application of simulator techniques to high angle of attack flight conditions for several current fighters is discussed. The discussion includes (1) the simulator hardware, (2) requirements for static and dynamic aerodynamic data inputs, (3) evaluation procedures, (4) correlation with flight, and (5) the effects of dynamic stability parameters. Results obtained with the simulator technique have correlated well with flight test experience, resulting in early identification of potential problems, identification of critical flight conditions, and solutions to various deficiencies in stability and control characteristics. Dynamic stability parameters, results indicate that certain parameters can have a large influence on the flying qualities and tactical effectiveness of fighters at high angles of attack.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AGARD Dyn. Stability Parameters; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Stall/spin test techniques used by NASA (1976)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Unique test techniques and facilities are reported which are used to predict the stall/spin characteristics of highly maneuverable military aircraft. Three of the more important test techniques are: (1) flight tests of dynamically scaled models; (2) rotary balance tests; and (3) piloted simulator studies. Recent experience has indicated that the extension of piloted simulation techniques to high angles of attack provides valuable insight as to the spin susceptibility of fighter configurations during representative air combat maneuvers. In addition, use of the technique is an effective method for the development and evaluation of automatic spin prevention concepts.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD Stall(Spin Probl. of Mil. Aircraft; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Applications of dynamic stability parameters to problems in aircraft dynamics (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The application and analysis of dynamic stability parameters were examined. The effects of wing leading edge modifications on the stalling and spinning characteristics of a single engine general aviation research airplane are evaluated. It is illustrated how dynamic stability parameters measured in wind tunnel tests are used to predict the spin resistance of this class of aircraft, and that autorotation criteria are derived from the relationships which exist between static and dynamic aerodynamic characteristics.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AGARD Dyn. Stability Parameters; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Estimation of dynamic stability parameters from drop model flight tests (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The overall remotely piloted drop model operation, descriptions, instrumentation, launch and recovery operations, piloting concept, and parameter identification methods are discussed. Static and dynamic stability derivatives were obtained for an angle attack range from -20 deg to 53 deg. It is indicated that the variations of the estimates with angle of attack are consistent for most of the static derivatives, and the effects of configuration modifications to the model were apparent in the static derivative estimates.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AGARD Dyn. Stability Parameters; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Results of recent NASA studies on spin resistance (1976)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Some of the factors which contribute to good stall/spin characteristics of a current fighter configuration indicate that the design of airframe components for inherent spin resistance is very configuration dependent and that few generalizations can be made. Secondary design features, such as fuselage forebody shape, can have significant effects on stability characteristics at high angles of attack. Recent piloted simulator studies and airplane flight tests have indicated that current automatic control systems can be tailored so as to provide a high degree of spin resistance for some configurations without restrictions to maneuverability. Such systems result in greatly increased pilot confidence and increased tactical effectiveness.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AGARD Stall(Spin Probl. of Mil. Aircraft; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
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