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  • 1
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    Effects Of Irradiation By Electrons On Two Polyimides (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Polyimides of new class, known as polyetherimides, used for composites and castings. Study undertaken to compare effects of electron radiation, in doses expected for 30-year missions in geosynchronous orbit, on molecular structures and tensile properties of two commercially available polyimides: polypyromellitimide and polyetherimide. Findings helpful in development of new polymers that endure radiation, leading to synthesis of polymers not having methyl groups or other moieties that are sources of hydrogen, inhibiting self-mending. Significance of study for polymer industry relating to structures in outer space considerable.
    Keywords: MATERIALS
    Type: LAR-14309 , NASA Tech Briefs (ISSN 0145-319X); 16; 10; P. 72
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Crustal deformation in the southern Longitudinal Valley area, eastern Taiwan (1992)
    In:  J. Geol. Soc. China, Taipei, Academia Sinica, vol. 35, no. 1-3, pp. 219-230, pp. L13610, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; China
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Space-time correlations of b-values with stress release (1992)
    In:  Pageoph, Luxembourg, Conseil de l'Europe, vol. 139, no. 6, pp. 449-462, pp. 1068, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Seismicity ; Stress ; Stress drop ; Statistical investigations
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Emergency medical operations at Kennedy Space Center in support of space shuttle (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The unique environment of the Kennedy Space Center includes a wide variety of industrial processes culminating in launch and spaceflight. Many are potentially hazardous to the work force and the astronauts. Technology, planning, training, and quality control are utilized to prevent contingencies and expedite response should a contingency occur.
    Keywords: AEROSPACE MEDICINE
    Type: Florida Medical Association, Journal (ISSN 0015-4148); 79; 8; p. 557-561.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Health services at the Kennedy Space Center (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Comprehensive occupational health services are provided to approximately 17,000 workers at the Kennedy Space Center and an additional 6000 on Cape Canaveral Air Force Station. These areas cover about 120,000 acres encompassing part of the Merritt Island Wild Life Refuge and wetlands which are the habitat of numerous endangered and protected species of wildlife. The services provided at the Kennedy Space Center optimally assure a safe and healthy working environment for the employees engaged in the preparation and launching of this country's Space Shuttle and other important space exploration programs.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Florida Medical Association, Journal (ISSN 0015-4148); 79; 8; p. 562-564.
    Format: text
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  • 6
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    The local properties of ocean surface waves by the phase-time method (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A new approach using phase information to view and study the properties of frequency modulation, wave group structures, and wave breaking is presented. The method is applied to ocean wave time series data and a new type of wave group (containing the large 'rogue' waves) is identified. The method also has the capability of broad applications in the analysis of time series data in general.
    Keywords: OCEANOGRAPHY
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 685-688
    Format: text
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  • 7
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    Model flight tests of a spin-resistant trainer configuration (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Powered, radio-controlled flight tests were conducted on a 1/4-scale model of a spin-resistant trainer configuration to determine the stall departure and spin resistance characteristics provided by an outboard wing leading-edge droop modification. The model was instrumented to provide quantitative as well as qualitative information on flight characteristics. Flight test results indicated that the unmodified configuration (wing leading-edge droop off) exhibited an abrupt, uncontrollable roll departure at the stall. With the outboard wing leading-edge droop installed, the modified configuration exhibited flight characteristics that were resistant to stall departure and spin entry. The stall departure and spin resistance characteristics of the modified configuration were demonstrated in flight maneuvers that included idle-power stalls, full-power stalls, sideslip stalls, and accelerated stalls.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Aircraft (ISSN 0021-8669); 29; 5, Se
    Format: text
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  • 8
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    Thermal and ultrasonic evaluation of porosity in composite laminates (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The effects of porosity on damage incurred by low-velocity impact are investigated. Specimens of graphite/epoxy composite were fabricated with various volume fractions of voids. The void fraction was independently determined using optical examination and acid resin digestion methods. Thermal diffusivity and ultrasonic attenuation were measured, and these results were related to the void volume fraction. The relationship between diffusivity and fiber volume fraction was also considered. The slope of the ultrasonic attenuation coefficient was found to increase linearly with void content, and the diffusivity decreased linearly with void volume fraction, after compensation for an approximately linear dependence on the fiber volume fraction.
    Keywords: COMPOSITE MATERIALS
    Type: In: Review of progress in quantitative nondestructive evaluation. Vol. 11B; Proceedings of the 18th Annual Review, Brunswick, ME, July 28-Aug. 2, 1991 (A93-19582 06-38); p. 1555-1562.
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The introduction of spurious models in a hole-coupled Fabry-Perot open resonator (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A hemispherical open resonator has previously been used to make relative comparisons of the surface resistivity of metallic thin-film samples in the submillimeter wavelength region. This resonator is fed from a far-infrared laser via a small coupling hole in the center of the concave spherical mirror. The experimental arrangement, while desirable as a coupling geometry for monitoring weak emissions from the cavity, can lead to the introduction of spurious modes into the cavity. Sources of these modes are identified, and a simple alteration of the experimental apparatus to eliminate such modes is suggested.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 63; 267
    Format: text
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  • 10
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    Quantifying parameters for Bayesian prior assumptions when estimating the probability of failure of software (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Software reliability has become increasingly important, especially in life-critical situations. The ability to measure the results of testing and to quantify software reliability is needed. If this is accomplished, a certain minimum amount of reliability for a piece of software can be specified, and testing and/or other analysis may be done until that minimum number has been attained. There are many models for estimating software reliability. The accuracy of these models has been challenged and many revisions for the models and recalibration techniques have been devised. Of particular interest is the method of estimating the probability of failure of software when no failures have yet occurred in its current version as described by Miller. This model uses black box testing with formulae based on Bayesian estimation. The focus is on three interrelated issues: estimating the probability of failure when testing has revealed no errors; modifying this estimation when the input use distribution does not match the test distribution; and combining the results from random testing with other relevant information to obtain a possibly more accurate estimate of the probability of failure. Obtaining relevant information about the software and combining the results for a better estimate for the Miller model are discussed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Hampton Univ., NASA(American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program 1992 p 136-138 (SEE N93-16760 05-80); Hampton Univ., NASA(
    Format: application/pdf
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