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  • Other Sources  (259)
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  • 1
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    The Design of the UNIXus-2®s0d Operating System (1986)
    Prentice-Hall Intern.
    In:  London, Prentice-Hall Intern., vol. A 744, pp. 6322, (Hardbound, ISBN: 0-12-065604-3, 320 pp.)
    Details
    Publication Date: 1986
    Keywords: Handbook of informatics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Correction of sideslip-induced static pressure errors in flight-test measurements (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 29; 114-117
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    NASA TECHNICAL REPORTS
  • 3
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    Attitude control with realization of linear error dynamics (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: An attitude control law is derived to realize linear unforced error dynamics with the attitude error defined in terms of rotation group algebra (rather than vector algebra). Euler parameters are used in the rotational dynamics model because they are globally nonsingular, but only the minimal three Euler parameters are used in the error dynamics model because they have no nonlinear mathematical constraints to prevent the realization of linear error dynamics. The control law is singular only when the attitude error angle is exactly pi rad about any eigenaxis, and a simple intuitive modification at the singularity allows the control law to be used globally. The forced error dynamics are nonlinear but stable. Numerical simulation tests show that the control law performs robustly for both initial attitude acquisition and attitude control.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 16; 1; p. 182-189.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An interdisciplinary field study of the energy and water fluxes in the atmosphere-biosphere system over semiarid rangelands - Description and some preliminary results (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: GEOSCIENCES (GENERAL)
    Type: American Meteorological Society, Bulletin (ISSN 0003-0007); 72; 1683-170
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    NASA TECHNICAL REPORTS
  • 5
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    Direct inversion of rigid-body rotational dynamics (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The global linearization (inversion) of rigid-body rotational dynamics is reviewed, and representations in terms of quaternions and direction cosines are compared. Certain properties common to quaternions and direction cosines that make their use preferable to Euler angles and that simplify the inversion procedure are described. Applications of the inversion procedure for state estimation and attitude control are discussed. To avoid complexities caused by aerodynamics, an example of direct inversion for linear feedback control of spacecraft attitude is given.
    Keywords: CYBERNETICS
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    NASA TECHNICAL REPORTS
  • 6
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    Angle-of-attack estimation for analysis of CAT encounters (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Recent studies of clear-air turbulence (CAT) encounters involving wide-body airliners have been based upon flight-path wind estimates made by analyzing digital flight-data-recorder (DFDR) records and radar records. Such estimates require a time history of the aircraft angle of attack, a record that is not usually included in the DFDR measurement set. This paper describes a method for reconstructing angle of attack that utilizes available flight record and aircraft-specific information associated with an aerodynamic model of the lift coefficient. Results from two wide-body incidents in which vane measurements of angle of attack were recorded show good agreement between measured and calculated time histories. This research has been performed in cooperation with the National Transportation Safety Board to provide a better understanding of the CAT phenomenon.
    Keywords: AIRCRAFT STABILITY AND CONTROL
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    NASA TECHNICAL REPORTS
  • 7
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    Angle-of-attack estimation for analysis of wind shear encounters (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Journal of Aircraft (ISSN 0021-8669); 24; 789-792
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    NASA TECHNICAL REPORTS
  • 8
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    New CO and HCN sources associated with IRAS carbon stars (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Emission of CO and HCN was detected in 22 out of a sample of 53 IRAS sources classified as unidentified carbon-rich objects. The sample was selected according to the presence of the silicon carbide feature as revealed by low-resolution spectra. The molecular line widths indicate that the CO and HCN emission arises from the circumstellar envelopes of very highly evolved stars undergoing mass loss. The visible stars tend to be deficient in CO as compared with unidentified sources. Most the detected CO and HCN IRAS stars are distinct and thick-shelled objects, but their infrared and CO luminosities are similar to those of IRC + 102156 AFGL and IRC-CO evolved stars. The 12 micron flux seems to be a good indicator of the distance, hence a guide for molecular searches.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 180; 1-2,
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    NASA TECHNICAL REPORTS
  • 9
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    Recursive inversion of externally defined linear systems by FIR filters (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The approximate inversion of an internally unknown linear system, given by its impulse response sequence, by an inverse system having a finite impulse response, is considered. The recursive least-squares procedure is shown to have an exact initialization, based on the triangular Toeplitz structure of the matrix involved. The proposed approach also suggests solutions to the problem of system identification and compensation.
    Keywords: CYBERNETICS
    Type: IEEE Transactions on Automatic Control (ISSN 0018-9286); 34; 635-637
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    NASA TECHNICAL REPORTS
  • 10
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    Analysis of the nature and cause of turbulence upset using airline flight records (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The development and application of methods for determining aircraft motions and related winds, using data normally recorded during airline flight operations, are described. The methods are being developed, in cooperation with the National Transportation Safety Board, to aid in the analysis and understanding of circumstances associated with aircraft accidents or incidents. Data from a recent DC-10 encounter with severe, high-altitude turbulence are used to illustrate the methods. The analysis of this encounter shows the turbulence to be a series of equally spaced horizontal swirls known as 'cat's eyes' vortices. The use of flight-data analysis methods to identify this type of turbulence phenomenon is presented for the first time.
    Keywords: AIR TRANSPORTATION AND SAFETY
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    NASA TECHNICAL REPORTS
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