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  • SPACE RADIATION  (8)
  • STRUCTURAL MECHANICS  (5)
  • AIRCRAFT STABILITY AND CONTROL  (2)
  • 2000-2004
  • 1985-1989  (9)
  • 1980-1984  (6)
  • 1945-1949
  • 1
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    Observation of a strong gamma-ray burst on the Spacelab 2 mission (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The observation of MeV gamma radiation from a burst on August 5, 1985 is reported. The burst was dominated by a single peak about 2 s wide, with softer, lower-level emission lasting about 20 s anywhere in the burst in any energy range. In the energy range from about 560 keV to about 10 MeV, the burst peaked about 0.3 s before the peak at lower energies. Radiation in the 10-16 MeV energy range was detected about 3 s before the lower-energy radiation, with roughly the same pulse width. This radiation was not detected during the main part of the burst. The energy of this burst in the range above 1 MeV was a significant fraction of the total burst energy, confirming earlier SMM results. If the appearance of high-energy photons prior to those at low energies is a ubiquitous feature of bursts or a class of bursts, current theoretical models may require considerable revision.
    Keywords: SPACE RADIATION
    Type: Advances in Space Research (ISSN 0273-1177); 6; 4, 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The frequency of weak gamma-ray bursts (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A search for weak gamma-ray bursts was conducted using a sensitive balloon-borne detector. One burst was detected in 64 hr of observation. The upper limit to the burst rate is 2300 bursts/yr above 6 x 10 to the -7th ergs/sq cm for simple spatial distribution models. Comparison with satellite results indicates that the slope of the log N-log S curve can be no steeper than -1 between 10 to the -4th and 10 to the -6th ergs/sq cm. A detailed procedure for calculating detector sensitivity to bursts is provided.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 479-485
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    3-D inelastic analysis methods for hot section components. Volume 2: Advanced special functions models (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This Annual Status Report presents the results of work performed during the third year of the 3-D Inelastic Analysis Methods for Hot Sections Components program (NASA Contract NAS3-23697). The objective of the program is to produce a series of computer codes that permit more accurate and efficient three-dimensional analyses of selected hot section components, i.e., combustor liners, turbine blades, and turbine vanes. The computer codes embody a progression of mathematical models and are streamlined to take advantage of geometrical features, loading conditions, and forms of material response that distinguish each group of selected components.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-179517 , NAS 1.26:179517 , PWA-5940-46-VOL-2
    Format: application/pdf
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  • 4
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    On 3-D inelastic analysis methods for hot section components (base program) (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 3-D Inelastic Analysis Method program is described. This program consists of a series of new computer codes embodying a progression of mathematical models (mechanics of materials, special finite element, boundary element) for streamlined analysis of: (1) combustor liners, (2) turbine blades, and (3) 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. Three computer codes, referred to as MOMM (Mechanics of Materials Model), MHOST (Marc-Hot Section Technology), and BEST (Boundary Element Stress Technology), have been developed and are briefly described in this report.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-175060 , NAS 1.26:175060 , ASR-2 , PWA-5940-36
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    NASA TECHNICAL REPORTS
  • 5
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    Stress analysis of gas turbine engine structures using the boundary element method (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The theory of the boundary element method is briefly reviewed with particular reference to the feasibility of elastic and inelastic three-dimensional stress analysis of complex structures characteristic of gas turbine engine components. Particular requirements of gas turbine analysis are defined, and examples of the use of a boundary element code designed for the three-dimensional stress analysis of turbine components are presented. It is shown that the general-purpose boundary element code can accurately and efficiently analyze many of the gas turbine engine structures.
    Keywords: STRUCTURAL MECHANICS
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  • 6
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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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  • 7
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    Capabilities of the GRO/BATSE for monitoring of discrete sources (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Although the Burst and Transient Source Experiment (BATSE) to be flown on the Gamma Ray Observatory has as its primary objective the detection of gamma ray bursts, its uncollimated design will enable it to serve a unique function as an all-sky monitor for bright hard X-ray and low-energy gamma ray sources. Pulsating sources may be detected by conventional techniques such as summed-epoch and Fourier analyses. The BATSE will, in addition, be able to use Earth occultation in an unprecedented way to monitor sufficiently bright sources as often as several times per day over approx. 85% of the sky. Estimates of the expected BATSE sensitivity using both of these techniques are presented.
    Keywords: SPACE RADIATION
    Type: OG-9.2-16 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 351-354; NASA-CP-2376-VOL-3
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  • 8
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    Gamma-ray burst spectroscopy capabilities of the BATSE/GRO experiment (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A scintillation spectrometer is included in each of the eight BATSE/GRO detector modules, resulting in all-sky coverage for gamma-ray bursts. The scientific motivation, design and capabilities of these spectrometers for performing spectral observations over a wide range of gamma-ray energies and burst intensities are described.
    Keywords: SPACE RADIATION
    Type: OG-9.2-15 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 347-350; NASA-CP-2376-VOL-3
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  • 9
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    Burst and Transient Source Experiment (BATSE) for the Gamma Ray Observatory (GRO) (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Burst and Transient Source Experiment (BATSE) on the Gamma Ray Observatory (GRO) is expected to provide new and better observational data on bursts to test current and future models of burst sources. These data will include: (1) the celestial distribution of hundreds of burst sources over the life of the mission, (2) burst locations within several degrees, within 2 days after their occurrence, (3) observations of weaker bursts and better observations of short timescale fluctuations and spectral variations, (4) observations by a single experiment over a much larger energy range than previously available, and (5) more sensitive measurements of the spectral features which have been observed in many bursts. This paper briefly describes the GRO mission, the BATSE instrumentation and the burst observational capabilities.
    Keywords: SPACE RADIATION
    Type: OG-9.2-14 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 343-346; NASA-CP-2376-VOL-3
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  • 10
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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
    Format: text
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