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  • Other Sources  (2)
  • AIRCRAFT STABILITY AND CONTROL  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • *Carrier Proteins
  • *Cell Cycle Proteins
  • *Tumor Suppressor Proteins
  • Acartia clausi
  • 1995-1999
  • 1990-1994  (2)
  • 1955-1959
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  • 1995-1999
  • 1990-1994  (2)
  • 1955-1959
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  • 1
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    Unknown
    Prediction of forces and moments for hypersonic flight vehicle control effectors (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This research project includes three distinct phases. For completeness, all three phases of the work are briefly described in this report. The goal was to develop methods of predicting flight control forces and moments for hypersonic vehicles which could be used in a preliminary design environment. The first phase included a preliminary assessment of subsonic/supersonic panel methods and hypersonic local flow inclination methods for such predictions. While these findings clearly indicated the usefulness of such methods for conceptual design activities, deficiencies exist in some areas. Thus, a second phase of research was conducted in which a better understanding was sought for the reasons behind the successes and failures of the methods considered, particularly for the cases at hypersonic Mach numbers. This second phase involved using computational fluid dynamics methods to examine the flow fields in detail. Through these detailed predictions, the deficiencies in the simple surface inclination methods were determined. In the third phase of this work, an improvement to the surface inclination methods was developed. This used a novel method for including viscous effects by modifying the geometry to include the viscous/shock layer.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-CR-193033 , NAS 1.26:193033
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    A multi-aperture spectrometer design for the Atmospheric Infrared Sounder (AIRS) (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The baseline multiaperture echelle spectrometer for the Atmospheric IR Sounder (AIRS) is described in terms of design and applications. The functional requirements for the optical design are set forth including the 1-K measurement goal, the 3.4-15.4 spectral bandpass, and the full global coverage twice daily. The multiaperture spectrometer is compared to the cross-dispersed spectrometer, and the multiaperture model is found to permit specific adjustments to the signal-to-noise ratio. The optical design of the spectrometer is described in terms of the focal-plane constraints, the multiaperture pupil-imaging relay, the spectrometer collimator, and the grating format and efficiency. The multiaperture design is found to have a good spectral-response function, and a 1.2 percent signal change is noted for a 95-percent unpolarized scene. The AIRS instrument is illustrated in its deployment configuration and is concluded to be capable of fulfilling the performance requirements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Lens Design Conference; Jun 11, 1990 - Jun 14, 1990; Monterey, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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