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  • ASTRONOMY  (3)
  • AIRCRAFT STABILITY AND CONTROL  (2)
  • SPACE RADIATION  (2)
  • STRUCTURAL MECHANICS  (2)
  • 2000-2004
  • 1980-1984  (9)
  • 1945-1949
  • 1
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    The ultraviolet astronomy mission: Columbus (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An ultraviolet astronomy mission (Columbus) is described. It exploits the spectral region between 900 and 1200A, which is extremely rich in containing the Lyman lines of hydrogen and deuterium and the Lyman band of their molecules, together with the resonance lines of many important ions. High resolving power and high sensitivity provide a unique capability for studying the brightest members of neighboring galaxies, the HeI and HeII absorption systems in quasars out to a red shift of 2, and the halos of intervening galaxies. Complementary focal plane instruments are planned in order to allow observations to longer (2000A) and shorter (100A) wavelengths. This wide coverage embraces the resonance lines of all the cosmically abundant elements and a wide range of temperature zones up to 100 million K.
    Keywords: ASTRONOMY
    Type: ESA 4th European IUE Conf.; p 483-487
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Three-dimensional Stress Analysis Using the Boundary Element Method (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The boundary element method is to be extended (as part of the NASA Inelastic Analysis Methods program) to the three-dimensional stress analysis of gas turbine engine hot section components. The analytical basis of the method (as developed in elasticity) is outlined, its numerical implementation is summarized, and the approaches to be followed in extending the method to include inelastic material response indicated.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center Nonlinear Struct. Anal.; p 149-160
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    NASA TECHNICAL REPORTS
  • 3
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    A note on the statistics of early-type close binaries (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A degree of contact index (I sub c) is defined, and its frequency diagram is given for 16 early-type close binaries. The objective is to determine whether the numbers of such systems are continuous or discontinuous across marginal contact. Data for four of the systems (TU Mus, V499 Sco, Delta Pic, and SZ Cam) derive from new photometric analyses, the results of which are also given. Present results indicate that there is continuity in frequency across marginal contact, although it would be desirable to include more binaries as further observations become available. It is noted that the only two systems in the bin of largest I sub c are known to be in the rapid phase of mass transfer.
    Keywords: ASTRONOMY
    Type: Astrophysics and Space Science; 76; 1, Ma; May 1981
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    NASA TECHNICAL REPORTS
  • 4
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    Observations of a weak gamma ray burst, A0535 plus 26, NP0532 and solar flare events by a balloon-borne detector array (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations of a cosmic gamma ray burst of about 10 to the -6 erg/sq cm, pulsed emission profiles of A0535 plus 26 and NP0532, and two solar flare events are reported for several energy intervals in 45-500 keV. The measurements were made with a NaI (Tl) detector array flown on a balloon to 4 g/sq cm residual atmosphere from Palestine, Texas Oct. 6-8, 1980 for 28 hours. The detector is a prototype of the Burst and Transient Source Experiment to be flown on the Gamma Ray Observatory.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
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    NASA TECHNICAL REPORTS
  • 5
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    Flight test experience with high-alpha control system techniques on the F-14 airplane (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved handling qualities of fighter aircraft at high angles of attack can be provided by various stability and control augmentation techniques. NASA and the U.S. Navy are conducting a joint flight demonstration of these techniques on an F-14 airplane. This paper reports on the flight test experience with a newly designed lateral-directional control system which suppresses such high angle of attack handling qualities problems as roll reversal, wing rock, and directional divergence while simultaneously improving departure/spin resistance. The technique of integrating a piloted simulation into the flight program was used extensively in this program. This technique had not been applied previously to high angle of attack testing and required the development of a valid model to simulate the test airplane at extremely high angles of attack.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AIAA PAPER 81-2505 , Flight Testing Conference; Nov 11, 1981 - Nov 13, 1981; Las Vegas, NV
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  • 6
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    3-D inelastic analysis methods for hot section components (base program) (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A 3-D inelastic analysis methods program consists of a series of computer codes embodying a progression of mathematical models (mechanics of materials, special finite element, boundary element) for streamlined analysis of combustor liners, turbine blades, and turbine vanes. These models address the effects of high temperatures and thermal/mechanical loadings on the local (stress/strain) and global (dynamics, buckling) structural behavior of the three selected components. These models are used to solve 3-D inelastic problems using linear approximations in the sense that stresses/strains and temperatures in generic modeling regions are linear functions of the spatial coordinates, and solution increments for load, temperature and/or time are extrapolated linearly from previous information. Three linear formulation computer codes, referred to as MOMM (Mechanics of Materials Model), MHOST (MARC-Hot Section Technology), and BEST (Boundary Element Stress Technology), were developed and are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-174700 , NAS 1.26:174700 , PWA-5940-19 , ASR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A Summery of an In-flight Evaluation of Control System Pure Time Delays During Landing Using the F-8 DFBW Airplane (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An in-flight investigation of the effect of pure time delays on low L/D space shuttle type landing tasks was undertaken. The results indicate that the sensitivity of the pilot ratings to changes in pure time delay in pitch is strongly affected by the task and only slightly affected by changes in control system augmentation mode. Low L/D spot landings from a lateral offset were twice as sensitive to pure time delay as normal low L/D landings. For comparison purposes, formation flying was also investigated, and was found to be less sensitive to time delay than the landing tasks.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AIAA PAPER 80-1626 , Atmospheric Flight Mechanics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA
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    NASA TECHNICAL REPORTS
  • 8
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    The Burst and Transient Source Experiment for the Gamma-Ray Observatory (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Burst and Transient Source Experiment (BATSE) is a highly sensitive, all-sky monitor for the Gamma-Ray Observatory (GRO). The eight scintillation detector modules of BATSE are positioned around the GRO spacecraft to provide a uniform view of the entire sky above the horizon. Each module is 20 in. in diameter, 0.5 in. thick and operates in the energy range from 40 to 600 keV. Rough burst locations can be derived from the relative counting rates of the detectors; longer-lived (greater than 100 min) transient sources can be detected and located by earth occultations. The data system contains mass memory to allow storage of large amounts of burst data in short time intervals. Data are sorted onboard in various ways into programmable energy, time and detector domains. Details of the design and capabilities of the BATSE are presented.
    Keywords: ASTRONOMY
    Type: Gamma ray transients and related astrophysical phenomena; Workshop; Aug 05, 1981 - Aug 08, 1981; La Jolla, CA
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    NASA TECHNICAL REPORTS
  • 9
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    Observations of a gamma-ray burst and other sources with a large-area, balloon-borne detector (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations of a weak cosmic gamma ray burst of integrated intensity 2 x 10 to the -6th erg/sq cm, two solar flare events, and pulsed emission profiles of A0535+26 and NP0532 are reported for several energy intervals in the energy range from 45 to 520 keV. The measurements were made with a NaI(Tl) detector array flown on a balloon to 4 g/sq cm residual atmosphere from Palestine, Texas, on October 6-8, 1980, for 28 hours. The detector is a prototype of the Burst and Transient Source Experiment (BATSE) to be flown on the Gamma-Ray Observatory (GRO).
    Keywords: SPACE RADIATION
    Type: Gamma ray transients and related astrophysical phenomena; Workshop; Aug 05, 1981 - Aug 08, 1981; La Jolla, CA
    Format: text
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    NASA TECHNICAL REPORTS
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