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  • 1
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    Dynamics of an expanding circular fault (1976)
    In:  Bull. Seism. Soc. Am., San Francisco, Pergamon, vol. 66, no. 5496, pp. 639-666, pp. B05315, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): SModelling ; Source mechanics ; Source ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
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    An analysis of tidal strain observations from the United States of America II. The inhomogeneous tide (1976)
    In:  Bull. Seism. Soc. Am., San Francisco, Pergamon, vol. 66, no. 6, pp. 1821-1846, pp. 1246
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Earth tides ; TIDES ; Inhomogeneity ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
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    The mechanics of locating earthquakes (1976)
    In:  Bull. Seism. Soc. Am., Tulsa, 3-4, vol. 66, no. 3-4, pp. 173-187, pp. B09405, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Seismology ; Location ; AUD ; Hypocenter determination ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Time-domain determination of earthquake fault parameters from short-period P-waves (1976)
    In:  Bull. Seism. Soc. Am., Roma, Polish Geothermal Association, vol. 66, no. 2, pp. 1459-1484, pp. B05406, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): High frequency ... ; Data analysis / ~ processing ; Fault plane solution, focal mechanism ; Seismology ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    Responsibilities in earthquake prediction (1976)
    In:  Bulletin of the Seismological Society of America, Tokyo, Am. Geophys. Union, vol. 66, no. 6, pp. 2069-2074, pp. 8043
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Earthquake precursor: prediction research ; ethics ; Seismology ; society ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
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    The effect of tectonic stress release on explosion P-wave signatures (1976)
    In:  Bull. Seism. Soc. Am., Hannover, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 66, no. 40, pp. 1441-1457, pp. L08305
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Nuclear explosion ; Stress ; P-waves ; Seismology ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    Seismicity of northern Anatolia (1976)
    In:  Bull. Seism. Soc. Am., London, Geological Society, vol. 66, no. 3, pp. 843-868, pp. L24307, (ISBN 1-86239-117-3)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Seismicity ; Turkey ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
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    Simplified procedures for estimating the fundamental period of a soil profile (1976)
    In:  Bull. Seism. Soc. Am., Amsterdam, Academic Press (Elsevier), vol. 66, no. 4, pp. 1293-1321, pp. 2486, (ISBN 1-86239-117-3)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Site amplification ; Spectrum ; method ; noksp ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    A two-dimensional analysis of surface deformation due to dip-slip faulting (1976)
    In:  Bull. Seism. Soc. Am., Heidelberg, 1, vol. 66, no. 4-5, pp. 667-675, pp. B01401, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Elasticity ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 10
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    Scaling relations for earthquake source parameters and magnitudes (1976)
    In:  Bull. Seism. Soc. Am., Regensburg, Inst. Electrical & Electronics Engineers, vol. 66, no. 3, pp. 1501-1523, pp. TC5001, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Source parameters ; Magnitude ; Source ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 11
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    Body force equivalents for stress-drop seismic sources (1976)
    In:  Bull. Seism. Soc. Am., Regensburg, Inst. Electrical & Electronics Engineers, vol. 66, no. 3, pp. 1801-1804, pp. TC5001, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Body waves ; Stress drop ; Elasticity ; Seismology ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 12
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    Abnormal seismology (1976)
    In:  Bull. Seism. Soc. Am., Warszawa, Elsevier, vol. 66, no. 1, pp. 617-623, pp. 2091, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Seismology ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 13
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    Inversion of the body waves from the Borrego Mountain earthquake to the source mechanism (1976)
    In:  Bull. Seism. Soc. Am., Hannover, FU Berlin, vol. 66, no. 3, pp. 1485-1499, pp. 5091692, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Inversion ; Body waves ; Earthquake ; Source ; Source parameters ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 14
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    Seismic characteristics of southeast Missouri as indicated by a regional telemetered microearthquake array (1976)
    In:  Bull. Seism. Soc. Am., Houston, Akademie-Verlag, vol. 66, no. 6, pp. 1953-1964, pp. L08310, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Seismology ; Teleseismic events ; Seismic arrays ; Schafer ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 15
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    A portable digital seismic recorder with event recording capability (1976)
    In:  Bull. Seism. Soc. Am., New York, Scientific American, vol. 66, no. Nov., pp. 979-985, pp. B10302, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Seismology ; Instruments ; Detectors ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 16
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    Preliminary empirical model for scaling Fourier amplitude spectra of strong ground acceleration in terms of earthquake magnitude, source-to-station distance and recording site conditions (1976)
    In:  Bull. Seism. Soc. Am., Warszawa, EGS, vol. 66, no. 4, pp. 1343-1373, pp. 1089, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Site amplification ; Earthquake engineering, engineering seismology ; Spectrum ; Strong motions ; Magnitude ; Attenuation ; Modelling ; noksp ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 17
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    Automatic seismic array and network detection (1976)
    In:  Bull. Seism. Soc. Am., Hannover, Elsevier, vol. 66, no. 4, pp. 1375-1380, pp. L15S14, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): Detectors ; Data analysis / ~ processing ; ARRAY ; Seismic networks ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 18
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    A computer program for the application Zoeppritz's amplitude equations and Knott's energy equations (1976)
    In:  Bull. Seism. Soc. Am., Corvallis, x + 406 pp., Oregon State University Press, vol. 66, no. 1, pp. 1881-1885, pp. L13610, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1976
    Schlagwort(e): EDV ; Energy (of earthquakes) ; Amplitude ; Data analysis / ~ processing ; Reflectivity ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 19
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    Computer simulation of screw dislocation in aluminum (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: The atomic structure in a 110 screw dislocation core for aluminum is obtained by computer simulation. The lattice statics technique is employed since it entails no artificially imposed elastic boundary around the defect. The interatomic potential has no adjustable parameters and was derived from pseudopotential theory. The resulting atomic displacements were allowed to relax in all three dimensions.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 137-146
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  • 20
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    A critical review of the effects of mean and combined stresses on fatigue limit of metals (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: The effects of mean and combined stresses on the fatigue limit of metals are critically reexamined. Data are presented which contradict the widely used fatigue limit analyses.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 51-65
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  • 21
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    Macroscopic aspects of interfacial reactions (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: The extent of interdiffusion and formation of new phases is determined by the constitution diagram of the alloy system, the interdiffusion coefficients of the phases present, and the thermal conditions (temperature and time) associated with the bonding process and/or subsequent use of the bonded structure. In many instance, the kinetics of interdiffusion and phase formation can be predicted from known parameters using numerical methods and computer techniques. Predictions are compared with experimentally determined parameters for a variety of metallurgical alloy systems.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 15-35
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  • 22
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    Microscopic aspects of interfacial reactions in diffusion bonding processes (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: Microscopic aspects of interfacial reactions are discussed, such as interdiffusion, formation of intermetallic phases, generation and annihilation of lattice defects, effect of temperature, grain size, etc., which normally occur in diffusion bonding processes. Relationships between properties and microstructure in thin film couples are examined utilizing a unique combination of contact resistance measurements and characterization by transmission electron microscopy.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 3-35
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  • 23
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    Gamma rays, cosmic rays and galactic structure (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: Working primarily from the recent SAS-2 observations of galactic gamma rays, the relation of these observations to the large scale distribution of cosmic rays and interstellar gas in the galaxy is reviewed and reexamined. Starting with a discussion of production rates, the case for pion decay being the predominant production mechanism in the galactic disk above 100 MeV is reestablished and it is also pointed out that Compton gamma rays can be a significant source. To facilitate discussion, the concepts of four distinct galactic regions are defined, viz. the nebulodisk, ectodisk, radiodisk and exodisk. Bremsstrahlung and pion decay gamma rays are associated with the first two (primarily the first) regions, and Compton gamma rays and synchrotron radiation are associated with the latter two regions. On a large scale, the cosmic rays, interstellar gas (primarily H2 clouds in the inner galaxy) and gamma ray emissivity all peak in a region between 5 and 6 kpc from the galactic center. This correlation is related to correlation with other population I phenomena and is discussed in terms of the density wave concept of galactic structure. The singular nature of the HI distribution appears to follow the supernova remnant and pulsar distributions in the galaxy.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 357-391
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  • 24
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    The non-thermal radiation in the galaxy (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The distribution of nonthermal emissivity with height z above the galactic plane is examined. The main result is that recent observations of the distribution of brightness at intermediate latitudes in the galaxy and of the edge-on spiral galaxy NGC 891 indicate that the emissivity extends to heights of several kpc perpendicular to the plane. The relationship between the nonthermal emissivity and the neutral gas is also studied. In several galaxies the angular distributions of neutral hydrogen and nonthermal emission are roughly coextensive and show similar features such as spiral structure. If radio galaxies and normal galaxies with strong nuclear radio sources are excluded, there appears to be a proportionality between their total HI content and their nonthermal radio luminosity.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 206-221
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  • 25
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    Gamma rays and supernova explosions (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The detection of gamma rays from supernovae will provide interesting tests of current theory. Some current ideas on the expected gamma ray flux, as modified by recent theoretical results are reviewed.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 289-298
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  • 26
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    COS-B observations of localised sources of gamma-ray emission (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: In October 1975 the high energy gamma ray flux from the Vela pulsar was measured by COS-B to be 1.6 to 2.1 times higher than the flux measured by SAS-2 in 1973. The existence is confirmed of a second region of enhanced radiation in the galactic anticenter in addition to that from the Crab pulsar.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 45A-51
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  • 27
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    SAS-2 galactic gamma ray results, 1 (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: Continuing analysis of the data from the SAS-2 high energy gamma-ray experiment has produced an improved picture of the sky at photon energies above 35 MeV. On a large scale, the diffuse emission from the galactic plane is the dominant feature observed by SAS-2. This galactic plane emission is most intense between galactic longitude 310 and 45 deg, corresponding to a region within 7kpc of the galactic center. Within the high-intensity region, SAS-2 observes peaks around galactic longitudes 315 deg, 330 deg, 345 deg, 0 deg, and 35 deg. These peaks appear to be correlated with such galactic features and components as molecular hydrogen, atomic hydrogen, magnetic fields, cosmic ray concentrations, and photon fields.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 1-11C
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  • 28
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    Extreme ultraviolet survey experiment MA-083 (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: A grazing incidence telescope sensitive to radiation in the 5- to 100-nanometer band was flown in the Apollo service module. On 10 nighttime revolutions, the command and service module was maneuvered to point the instrument at 30 different stellar targets for periods of 1 to 20 minutes, thus constituting the first sensitive search for extreme ultraviolet radiation from nonsolar sources. Several hours of supplementary data were also obtained during nighttime orbits when other experiments in the scientific instrument module bay were operating. Preliminary analysis of a small fraction of the total data indicates the definite detection of a strong source of extreme ultraviolet radiation during observations made during revolution 109. The source is located in Coma Berencies. The suggested optical identification is the white dwarf HZ 43. If this association is correct, the star has the highest temperature of any known white dwarf. Regardless of the optical identification, however, this object is the first nonsolar source to be detected in the extreme ultraviolet band.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Lyndon B. Johnson Space Center Apollo-Soyuz Test Project; 16 p
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  • 29
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    Cosmic X-ray observations with OSO-8 (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: The GSFC Cosmic X-ray Spectroscopy experiment aboard OSO-8 has operated successfully since launch providing spectral and temporal data on X-ray sources in tha energy range 2-60 keV. Analysis of quick look data shows a variety of spectral features, some stable, others variable, which will increase understanding of the nature of individual sources. In particular, observed emission and absorption features that can be attributed to iron will result in abundance measures of this important element in sources such as some X-ray binaries, the supernova remnant Cas A, and the nucleus of the galaxy Cen A.
    Schlagwort(e): SPACE RADIATION
    Materialart: X-ray Binaries; p 67-79
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  • 30
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    Monotectic and syntectic alloys experiment MA-044 (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The flight test furnace run of the monotectic and syntectic alloys experiment was successfully performed during the Apollo Soyuz Test Project mission. All three experiment cartridges were returned intact. A second ground based test was conducted after the mission to provide one g samples with an equivalent thermal history. The examinations of all flight and ground based cartridges and ampoules have been completed. Encouraging results have been obtained in the preliminary analysis of one flight aluminum antimonide sample as compared to ground based and prototype test counterparts. In terms of reduction of the unwanted second phase, the low g sample shows a homogeneity improvement by a factor of 5 to 20. Preliminary examination of one lead zinc flight sample shows a dispersion of lead in the zinc matrix. However, complete homogenization of the material did not occur. A thermal analysis of flight data shows that the average soak temperature for the head zinc ampoules was 20 C lower than planned but 35 C above the published consolute temperature..
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Apollo-Soyuz Test Project; 25 p
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  • 31
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    Cosmic ray propagation and containment (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: The cosmic rays, an active gaseous component of the disk of the galaxy, are considered along with their propagation and containment as a part of the general dynamics of the disk. The sources of cosmic rays are a matter of speculation. The disk is inflated by the cosmic ray gas pressure comparable to the magnetic pressure, but the rate of inflation is unknown. The time spent by the individual cosmic ray particles in the disk is inversely proportional to the cosmic ray production rate. It is evident from the decay of Be(1c) that the cosmic rays circulate through a volume of space perhaps ten times the thickness of the gaseous disk, suggesting a magnetic halo extending out approximately 1 kpc from either face of the disk. The cosmic rays may be responsible for the halo by inflating the magnetic fields of the disk. Extension of the fields to 1 kpc would imply a high production rate and short life of cosmic rays in the dense gaseous disk of the galaxy.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 320-340
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  • 32
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    Low and medium energy galactic gamma-ray observations (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: Observation of 0.2-100 MeV diffuse gamma radiation emitted from the Galaxy can provide information on the intensities of 5-50 MeV/nucleon cosmic-rays and 50 MeV electrons in interstellar space. Recent measurements of gamma-rays emitted from the galactic center region provide evidence for a diffuse continuum between 10 and 100 MeV. The intensities of the recently reported nuclear line gamma rays, also observed in the direction of the galactic center, require the presence of intense fluxes of low-energy cosmic-rays in the inner Galaxy if the gamma-rays are produced on a galactic scale. Current detection techniques for 0.1-100 MeV gamma-ray measurements are summarized and their capabilities for measuring the diffuse galactic emission are evaluated.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center. The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 65-83
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  • 33
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    Crystal activation experiment MA-151 (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: The crystal activation experiment consisted of two sample packages that were flown in the command module and returned to earth for analysis of the radioactivity induced in them during the flight. The objective of the experiment was to define the background caused by detector activation that interferes when gamma radiation is measured in the 0.02- to 10-megaelectronvolt range from earth orbit. Preliminary results show that the activation of the NaI(Tl) crystal was a factor of 3 below that from a similar measurement on Apollo 17. The identification of certain species and the level of activation observed show an important contribution from the interactions of thermal and energetic neutrons produced as secondaries in the spacecraft. That the activation was reduced by only a factor of 3 compared with the Apollo 17 experiment, despite the geomagnetically shielded orbit, possibly indicates more efficient secondary neutron production by the more energetic cosmic rays.
    Schlagwort(e): SPACE RADIATION
    Materialart: Apollo-Soyuz Test Project; 10 p
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  • 34
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    Gamma rays and large scale galactic structure (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: Many theoretical models were developed in an attempt to explain the spatial structure in the observed emission which results from interactions of energetic cosmic rays with the interstellar gas. The peaks in the observed distribution are remarkably well correlated with longitudes corresponding to tangential directions to known spiral arm features. Based on theoretical and experimental arguments, it is assumed that on the scale of galactic arms the cosmic rays are more intense where the mass of the gas to which they are coupled is greatest. Refining this model with the results of recent surveys of the interstellar gas, a good fit to the observations is obtained whether the cosmic rays are confined to the spiral arms in the disk or are more evenly confined as in a flat halo model.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 341-354
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  • 35
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    The time structure of the gamma-ray emission from the Crab and Vela pulsars (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: High resolution data on the pulsed gamma ray emission from the Crab and Vela pulsars are presented. The light curves of these two pulsars at gamma ray energies show striking similarities.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 52-64
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  • 36
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    Preliminary Results from the European Space Agency's COS-B satellite for gamma-ray astronomy (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The COS-B satellite carries a single experiment, capable of detecting gamma rays with energies greater than 30 MeV. Its objectives are to study the spatial, energy, and time characteristics of high energy radiation of galactic and extragalactic origin. The capability to search for gamma ray pulsations is enhanced by the inclusion in the payload of a proportional counter sensitive to X-rays of 2-12 Kev. The experiment was calibrated using particle accelerators. The results of these measurements are presented and the performance of the system in orbit is discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 23-38
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  • 37
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    Soft X-ray observation experiment MA-048 (1976)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: The Apollo Soyuz Test Project Soft X-ray Experiment was designed to observe celestial X-ray sources in the energy range from 0.1 to 10 kiloelectronvolts. The instrument that was used in the experiment obtained energy and fast timing data to characterize both the spectrum and the variability of known X-ray sources. Data were obtained on approximately 12 sources. During the mission, the instrument developed an intermittent high voltage discharge problem that resulted in the loss of approximately 75 percent of the anticipated data, including the scans intended for mapping of the low energy diffuse X-ray background.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Lyndon B. Johnson Space Center Apollo-Soyuz Test Project; 11 p
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  • 38
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    SAS-2 galactic gamma ray results. 2. Localized sources (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: Gamma-ray emission was detected from the radio pulsars PSR1818-04 and PSR1747-46, in addition to the previously reported gamma-ray emission from the Crab and Vela pulsars. Since the Crab pulsar is the only one observed in the optical and X-ray bands, these gamma-ray observations suggest a uniquely gamma-ray phenomenon occurring in a fraction of the radio pulsars. Using distance estimates it is found that PSR1818-04 has a gamma-ray luminosity comparable to that of the Crab pulsar, while the luminosities of PSR1747-46 and the Vela pulsar are approximately an order of magnitude lower. This survey of SAS-2 data for pulsar correlations has also yielded upper limits to gamma-ray luminosity for 71 other radio pulsars.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 12-22
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  • 39
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    COS-B observations of the high energy gamma radiation from the galactic disc (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: During the first months of operation, COS-B has observed galactic high energy gamma rays from the galactic disc. In the galactic center and Vela regions the disc emission distribution was measured. From these data the existence of a local ( 1 kpc) and a distant ( 3 kpc) emitting region is apparent in the general direction of the inner galaxy.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center The Galaxy and Galactic Gamma Rays; p 39-44
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  • 40
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    Interstellar helium flow experiment MA-088 (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The Apollo Soyuz Test Project Interstellar Helium Glow Experiment (MA-088) studied the motion of helium in the local interstellar medium as that medium passed through the solar system to determine several poorly known properties of the local interstellar gas. The instrument used was a photometer sensitive to two solar extreme ultraviolet spectral lines that are resonantly scattered by helium gas. The instrument surveyed the entire celestial sphere during a series of slow, rolling maneuvers by the Apollo spacecraft. The equipment operated properly, and usable data were obtained.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Lyndon B. Johnson Space Center Apollo-Soyuz Test Project; 15 p
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  • 41
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    On onsagers principle, dislocation motion and hydrogen embrittlement (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: Onsager's reciprocal relationships from the linear theory of irreversible thermodynamics are applied to hydrogen - dislocation interactions. Existing experimental evidence shows that dislocation motion causes localized hydrogen accumulation; thus, from the Onsager principle, localized hydrogen accumulations will affect dislocation motion and therefore the properties of metals and alloys exposed to hydrogen environments.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 77-84
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  • 42
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    Whence cometh /and goeth/ Jupiter's high energy electrons (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Jupiter's decimetric emission is universally identified as synchrotron radiation from about 10 MeV electrons. These electrons radiate away their energy in a few months and hence must be continuously replaced. A theory in which electrons are injected at Jupiter's magnetopause and radially diffuse toward the planetary surface, gaining energy in the process is summarized. The radial diffusion coefficient in the inner magnetosphere is determined. This diffusion coefficient, which also holds for protons, is sufficiently small that the inner Galilean satellites can wipe out large fractions of the incoming proton and electron fluxes. The reduction of the proton flux is extremely important to the survival of the Pioneer experimental payloads.
    Schlagwort(e): SPACE RADIATION
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  • 43
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    Stress rupture resistance (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Principles underlying the design of metallic systems for stress rupture resistance are outlined by considering the specific case studies of cobalt- and nickel-base superalloys. Ways in which superalloys can be designed for high stress rupture resistance are discussed. In describing the alloying procedures, the strengthening mechanisms involved and methods of avoiding phases detrimental to stress rupture resistance are identified. New processing techniques such as controlled solidification, prealloyed powder processing, and autoclave heat treatments are described as further means of achieving increased stress rupture resistance in superalloy and other systems.
    Schlagwort(e): METALLIC MATERIALS
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  • 44
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    Metal powder reactions in ball milling (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: On milling chromium powder in three metal chlorides and either chromium or nickel powders in ten organic liquids representative of nine different functional groups, the powders always reacted with the liquids and became contaminated with elements from them. The milled powders had specific surface areas ranging from 0.14 to 37 sq m/g, and the total contamination with elements from the milling liquid ranged from 0.01 to 56 wt%. In most milling runs, compounds resulting from substitution, addition, or elimination reactions formed in or from the milling liquid, and in most runs with organic liquids H2, CH4, and CO2 were generated.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: I & EC - Industrial and Engineering Chemistry; vol. 15
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  • 45
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    Scintillating plastic fibers as light pipes for a cosmic ray hodoscope: Feasibility calculations and measured attenuation characteristics (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A candidate hodoscope uses arrays of scintillator fibers, followed by an image intensifier and imaging system such as that proposed for the X-ray shadowgraph. A literature search was performed to ascertain the experience of other workers with hodoscopes using this or similar principles. Calculations were performed to determine the feasibility of candidate systems and some laboratory experiments were performed to attempt to check these numbers.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Specific Light Output of Cesium Iodide Crystals; p 45-58
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  • 46
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    Discussion of 'Unusual potential drop during the application of the electrical potential method in a fracture mechanics test' by V. Bachmann and D. Munz (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Journal of Testing and Evaluation; 4; Nov. 197
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  • 47
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    Dissolution kinetics of small amounts of oxygen in tantalum alloy T-111 and internal oxide displacement reactions during annealing (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Oxygen was added to T-111 (Ta-8W-2Hf, wt. %) at 820 and 990 C at an oxygen pressure of about 0.0003 torr. The technique employed permitted predetermined and reproducible doping of T-111 up to 3.0 at. % oxygen. Based on the temperature dependence of the doping reaction, it is concluded that the initial rates of oxygen pickup are probably controlled by solution of oxygen into the T-111 lattice. Although hafnium oxides are more stable than those of tantalum or tungsten, analyses of extracted residues indicate that the latter oxides predominate in the as-doped specimens, presumably because of the higher concentrations of tantalum and tungsten in the alloy. However, high-temperature annealing promotes gettering of dissolved oxygen and of other oxides to form hafnium oxides. Small amounts of tantalum and tungsten oxides were still present after high-temperature annealing. Tungsten oxide (WO3) volatilizes slightly from the surface of T-111 at 990 C. The vaporization of WO3 has no apparent affect on the doping reaction.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Oxidation of Metals; 10; Oct. 197
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  • 48
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    Monitoring crack extension in fracture toughness tests by ultrasonics (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: An ultrasonic method was used to observe the onset of crack extension and to monitor continued crack growth in fracture toughness specimens during three-point bend tests. A 20-MHz transducer was used with commercially available equipment to detect average crack extension less than 0.09 mm. The material tested was a 300-grade maraging steel in the annealed condition. A crack extension resistance curve was developed to demonstrate the usefulness of the ultrasonic method for minimizing the number of tests required to generate such curves.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Journal of Testing and Evaluation; 4; Nov. 197
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  • 49
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    Alloy softening in binary iron solid solutions (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An experimental study was conducted to determine whether alloy softening in Fe alloys is dependent on electron concentration and to provide a direct comparison of alloy softening and hardening in several binary Fe alloy systems having the same processing history. Alloy additions to Fe included the elements in the Periods 4-6 and the Groups IV-VIII with the exception of technetium. A total of 19 alloy systems was investigated, and hardness testing was the primary means of evaluation. Testing was carried out at four temperatures over a homologous temperature range of 0.043-0.227 times the absolute melting temperature of unalloyed Fe. Major conclusions are that the atomic radius ratio of solute-to-Fe is the key factor in controlling low-temperature hardness of the binary Fe alloys and that alloy softening rates at 77 K and alloy hardening rates at 411 K are correlated with this atomic radius ratio for 15 of the binary alloy systems. Mechanisms of alloy softening and hardening are proposed.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Journal of the Less-Common Metals; 48; Aug. 197
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  • 50
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    Local and large scale galactic gamma-ray emission (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A study of the gas-to-dust ratio suggests that interstellar reddening may provide an accurate way of assessing column densities in various directions in the Galaxy. A gamma ray intensity of 7.25 x 10 to the -5th E sub B-V photon/sq cm/s/sterad is predicted for regions of the Galaxy where the medium cosmic ray density is equal to that observed close to the sun. It is found that in the longitude range of about 0-180 degrees, the large scale cosmic ray distribution producing the gamma rays follows that of extreme population I stars put in evidence by giant H II regions, and that of molecular hydrogen traced by carbon monoxide emission. The gamma-ray production exhibits a maximum at R roughly equal to 5 kpc, and practically vanishes at R not less than 11 kpc, beyond the location of the outermost H II regions.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astronomy and Astrophysics; 50; 2, Ju; July 197
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  • 51
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    Electrons in a closed galaxy model of cosmic rays (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper considers the consistency of positrons and electrons with a propagation model in which the cosmic rays are stopped by nuclear collisions or energy losses before they can escape from the Galaxy (the closed-galaxy model). The fact that no inconsistency is found between the predictions and the data implies that the protons which produce the positrons by nuclear reactions could have their origin in a large number of distant sources, as opposed to the heavier nuclei which in this model come from a more limited set of sources. The closed-galaxy model predicts steep electron and positron spectra at high energies. None of these are inconsistent with present measurements; but future measurements of the spectrum of high-energy positrons could provide a definite test for the model. The closed-galaxy model also predicts that the interstellar electron intensity below a few GeV is larger than that implied by other models. The consequence of this result is that electron bremsstrahlung is responsible for about 50% of the galactic gamma-ray emission at photon energies greater than 100 MeV
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysics and Space Science; 45; Nov. 197
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  • 52
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    Growth kinetics of gamma-prime precipitates in a directionally solidified eutectic, gamma/gamma-prime-delta (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A directionally solidified eutectic alloy (DSEA), of those viewed as potential candidates for the next generation of aircraft gas turbine blade materials, is studied for the gamma-prime growth kinetics, in the system Ni-Nb-Cr-Al, specifically: Ni-20 w/o Nb-6 w/o Cr-2.5 w/o Al gamma/gamma-prime-delta DSEA. Heat treatment, polishing and etching, and preparation for electron micrography are described, and the size distribution of gamma-prime phase following various anneals is plotted, along with gamma-prime growth kinetics in this specific DSEA, and the cube of gamma-prime particle size vs anneal time. Activation energies and coarsening kinetics are studied.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; Aug. 197
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  • 53
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    Large area ion chambers for a high energy cosmic ray experiment (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: High resolution measurement of the iron group nuclei was performed with the intention of determining individual abundances in the cosmic ray flux at the earth of particles with z = 22 to 30. Of the three types of dE/dx detectors used in the experiment, pulse ion chambers, Cerenkov radiators and scintillators, the first has the best z resolution over a wide range of particle z and energy. The plastic scintillators define the particle acceptance cone of the telescope while the Cerenkov detector aids in rejection of low energy particle background and measurement of particle velocity.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Specific Light Output of Cesium Iodide Crystals; p 1-44
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  • 54
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    Corrosion of oxygen-doped tantalum by lithium (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The increase in the penetration of tantalum by liquid lithium with increasing oxygen content of tantalum results from the ability of lithium to extract oxygen from tantalum oxides and/or from regions of high oxygen concentrations, accompanied by the creation of minute channels. At low oxygen concentration, oxides are present primarily at the grain boundaries and the lithium penetration is primarily intergranular. At high oxygen concentration, oxides and/or regions of high oxygen concentration are present both at the grain boundaries and within the grains; lithium penetration is both intergranular and transgranular. For a specific oxygen concentration, the severity of corrosion decreases with increasing temperature because (1) the oxygen solubility increases with temperature, decreasing the number of oxide particles and/or regions of high oxygen concentration, and (2) the diffusivity of oxygen in tantalum increases, allowing more rapid oxygen removal at the tantalum lithium interface.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Corrosion Science; 16; 1976
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  • 55
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    Measurement of the primary cosmic electron spectrum from 10 to about 250 GeV (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The intensity and energy spectrum of primary cosmic electrons from 10 to about 250 GeV have been studied by using balloon-borne detectors. The detectors were large-area ionization calorimeters which sampled showering particles frequently and demonstrated an energy resolution of about 7% in calibration tests. On one of the flights a time-of-flight system and detectors to sample the lateral properties of showers were used to examine and to test background rejection. The results of the balloon flights from Alamogordo, N. Mex., in 1970 and Cape Girardeau, Mo., in 1972 indicated that the primary cosmic ray electron differential energy spectrum exhibits no change of slope in the energy range measured and is well represented by a power law. The results indicate that the cosmic electron spectrum is steeper than the cosmic ray proton spectrum. It is shown that these data are consistent with the leakage lifetime model for the propagation of cosmic electrons in the galaxy, although other more complex models cannot be excluded on the basis of these data.
    Schlagwort(e): SPACE RADIATION
    Materialart: Journal of Geophysical Research; 81; Aug. 1
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  • 56
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    A literature review and inventory of the effects of environment on the fatigue behavior of metals (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The current state of knowledge of the effects of gas environments (at atmospheric pressure and below) on the fatigue behavior of metals is reviewed. Among the topics considered are the mechanisms proposed to explain the differences observed in the fatigue behavior of vacuum- and air-tested specimens, the effects of environment on the surface topography of fatigue cycled specimens, the effect of environment on the various phases of the fatigue phenomenon, the effect of prolonged exposure to vacuum on fatigue life, the variation of fatigue life with decreasing gas pressure, and gas evolution during fatigue cycling. Analysis of the findings of this review indicates that hydrogen embrittlement is primarily responsible for decreased fatigue resistance in humid environments, and that dislocations move more easily during tests in vacuum than during test in air. It was found that fatigue cracks generally initiated and propagated more rapidly in air than in vacuum. Prolonged exposure to vacuum does not adversely affect fatigue resistance. The variation of fatigue life with decreasing gas pressure is sometimes stepped and sometimes continuous.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Engineering Fracture Mechanics; 8; 2, 19; 1976
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  • 57
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    Solar modulation and a galactic origin for the anomalous component observed in low-energy cosmic rays (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The current theory of solar modulation can be used to argue that the cosmic-ray component at low energies, which is observed to have an anomalous composition, is not of galactic origin, i.e., it is not a component of the galactic cosmic-ray flux. The current theory predicts, from quite general considerations, that an unreasonably large intensity of cosmic rays, by many orders of magnitude, would be required in the interstellar medium to account for the observed fluxes. Conceivably, the current modulation theory could be modified so that only reasonable interstellar fluxes are predicted. One such modification involves an unusual scheme for particle diffusion in the interplanetary medium. Particles are assumed to diffuse not as a result of their own motion among small-scale irregularities in the magnetic field, but rather in a process in which they are trapped between time-varying constrictions in the large-scale field.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 206; May 15
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  • 58
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    Effect of adsorbed films on friction of Al2O3-metal systems (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The kinetic friction of polycrystalline Al2O3 sliding on Cu, Ni, and Fe in ultrahigh vacuum was studied as a function of the surface chemistry of the metal. Clean metal surfaces were exposed to O2, Cl2, C2H4, and C2H3Cl, and the change in friction due to the adsorbed species was observed. Auger electron spectroscopy assessed the elemental composition of the metal surface. It was found that the systems exposed to Cl2 exhibited low friction, interpreted as the van der Waals force between the Al2O3 and metal chloride. The generation of metal oxide by oxygen exposures resulted in an increase in friction, interpreted as due to strong interfacial bonds established by reaction of metal oxide with Al2O3 to form the complex oxide (spinel). The only effect of C2H4 was to increase the friction of the Fe system, but C2H3Cl exposures decreases friction in both Ni and Fe systems, indicating the dominance of the chlorine over the ethylene complex on the surface
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Journal of Applied Physics; 47; June 197
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  • 59
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    Photonuclear interactions of ultrahigh energy cosmic rays and their astrophysical consequences (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Results are presented for detailed Monte Carlo calculations of the interaction histories of ultrahigh-energy cosmic-ray nuclei with intergalactic radiation fields, using improved estimates of these fields and empirical determinations of photonuclear cross sections, including multinuclear disintegrations for nuclei up to Fe-56. Intergalactic and galactic energy-loss rates and nucleon-loss rates for nuclei up to Fe-56 are also given. Astrophysical implications are discussed in terms of expected features in the cosmic-ray spectrum between 10 to the 18th and 10 to the 21st power eV for the universal and supercluster origin hypotheses. The results of these calculations indicate that ultrahigh-energy cosmic rays cannot be universal in origin regardless of whether they are protons or nuclei. Both the supercluster and galactic origin hypotheses, however, are possible regardless of nuclear composition.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 205; Apr. 15
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  • 60
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    Thermal expansion in the Ni-Cr-Al and Co-Cr-Al systems to 1200 C determined by high-temperature X-ray diffraction (1976)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; May 1976
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  • 61
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    A film-rupture model of hydrogen-induced, slow crack growth in acicular alpha-beta titanium (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A study has been conducted of the terrace-like fracture morphology of gaseous hydrogen-induced crack growth in acicular alpha-beta titanium alloys in terms of specimen configuration, magnitude of applied stress intensity, test temperature, and hydrogen pressure. Although the overall appearance of the terrace structure remained essentially unchanged, a distinguishable variation is found in the size of the individual terrace steps, and step size is found to be inversely dependent upon the rate of hydrogen-induced slow crack growth. This inverse relationship is independent of all the variables investigated. These observations are quantitatively discussed in terms of the formation and growth of a thin hydride film along the alpha-beta boundaries and a qualitative model for hydrogen-induced slow crack growth is presented, based on the film-rupture model of stress corrosion cracking.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; May 1976
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  • 62
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    Observations on the relationship of structure to the mechanical properties of thin TD-NiCr sheet (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A study of the relationship between structure and mechanical properties of thin TD-NiCr sheet indicated that the elevated temperature tensile, stress-rupture, and creep strength properties are dependent on grain aspect ratio and sheet thickness. In general, the strength properties increase with increasing grain aspect ratio and sheet thickness. Tensile testing revealed an absence of ductility at elevated temperatures (not less than 1144 K). Significant creep damage as determined by subsequent tensile testing at room temperature occurs after very small amounts (less than 0.1%) of prior creep deformation over the temperature range 1144-1477 K. A threshold stress for creep appears to exist. Creep exposure below the threshold stress at T not less than 1366 K results in almost full retention of room temperature tensile properties.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; May 1976
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  • 63
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    Three-dimensional interplanetary stream magnetism and energetic particle motion (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Cosmic rays interact with mesoscale configurations of the interplanetary magnetic field. A technique is presented for calculating such configurations in the inner solar system, which are due to streams and source conditions near the sun, and maps of magnetic field are constructed for some plausible stream and source conditions. One effect of these mesoscale configurations on galactic cosmic rays is shown to be an out-of-the-ecliptic gradient drift sufficient to explain Forbush decreases. The effects on solar energetic particles include small polar drifts due to the field gradients and a possibly large modification of the time-intensity profiles and anisotropy characteristics due to the formation of mirror configurations in space. If a diffusion model is applicable to solar particles, the true diffusion coefficient will be masked by the effects of streams. A conceptual model which incorporates these ideas and those of several other models is presented.
    Schlagwort(e): SPACE RADIATION
    Materialart: Journal of Geophysical Research; 81; May 1
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  • 64
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    Composition effects on mechanical properties of HfC-strengthened molybdenum alloys (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The mechanical properties of swaged rod thermomechanically processed from arc-melted Mo-2Re-Hf-C alloys containing as much as 0.9 mol pct HfC have been evaluated. The low temperature ductilities of these alloys were not influenced by the amount of HfC present but by the amount of Hf in excess of stoichiometry. Maximum ductility occurred at 0.2 to 0.3 at. pct excess Hf. At 0.3 to 0.5 mol pct HfC, alloy strength varied directly with the Mo content of extracted carbide particles, both decreasing as the amount of excess Hf increased. Additions of 2 at. pct Re had little effect on strength or ductility. Tensile and creep strengths of Mo-2Re-0.7Hf-0.5C alloy equaled or exceeded those of other high strength Mo alloys.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; Mar. 197
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  • 65
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    Shear strength of metal-sapphire contacts (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The shear strength of polycrystalline Ag, Cu, Ni, and Fe contacts on clean (0001) sapphire has been studied in ultrahigh vacuum. Both clean metal surfaces and surfaces exposed to O2, Cl2, and C2H4 were used. The results indicate that there are two sources of strength of Al2O3-metal contacts: an intrinsic one that depends on the particular clean metal in contact with Al2O3 and an additional one due to intermediate films. The shear strength of the clean metal contacts correlated directly with the free energy of oxide formation for the lowest metal oxide, in accord with the hypothesis that a chemical bond is formed between metal cations and oxygen anions in the sapphire surface. Contacts formed by metals exposed to chlorine exhibited uniformly low shear strength indicative of van der Waals bonding between chlorinated metal surfaces and sapphire. Contacts formed by metals exposed to oxygen exhibited enhanced shear strength, in accord with the hypothesis that an intermediate oxide layer increases interfacial strength.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Journal of Applied Physics; 47; Mar. 197
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  • 66
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    The interplanetary acceleration of energetic nucleons (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Corotating proton and electron streams are the dominant type of low-energy (i.e., 0.1-10 MeV per nucleon) particle event observed at 1 AU. The radial dependence of these events has been studied between 1 and 4 AU using essentially identical low-energy detector systems on IMP-7, Pioneer-10, and Pioneer-11. It had been expected that at a given energy, the intensity of these streams would decrease rapidly with heliocentric distance due to the effects of interplanetary adiabatic deceleration. Instead, it is observed that from event to event, the intensity either remains roughly constant or increases significantly (more than an order of magnitude) between 1 and 4 AU. It appears that interplanetary acceleration processes are the most plausible explanation. Several possible acceleration models are discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 203; Feb. 1
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  • 67
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    Determination of the surface composition of binary alloys by auger electron spectroscopy: The gold-silver and gold-tin systems (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Polycrystalline Au-Ag alloy foils of a wide range of composition were cleaned and equilibrated in ultra high vacuum. Using two different types of energy analyzers for comparison, the intensities of the Auger emission from transitions at several energies were measured and normalized to those of pure Au and Ag. A model developed to describe the intensity of Auger emission was applied to the intensities and the surface monolayer compositions of the alloys were thus determined. The Auger data were consistent with enrichment of Ag in the surface monolayer.
    Schlagwort(e): METALLIC MATERIALS
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  • 68
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    Powder metallurgical components from lunar metal (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Lunar Science Inst., Abstracts of Papers Presented at a Special Session of the Seventh Annual Lunar Science Conference on Utilization of Lunar Materials and Expertise for Large Scale Operations in Space; p 120-123
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  • 69
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    Design of equipment for vapor phase processing of metals (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Lunar Science Inst., Abstracts of Papers Presented at a Special Session of the Seventh Annual Lunar Science Conference on Utilization of Lunar Materials and Expertise for Large Scale Operations in Space; p 110-113
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  • 70
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    Evaluation of clad scintillating light pipes (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Arrays of fibers made of scintillating material were used as position-sensitive detectors or hodoscopes for beam-finding at ion accelerators. Experiments were made with alpha's from an Am241 source incident upon one end of the fiber, the other end being viewed with a photomultiplier tube. The scintillation light was not detected in any of the fibers tested beyond about 5 cm. The effective useful lengths for detection of relativistic heavy ions were given.
    Schlagwort(e): SPACE RADIATION
    Materialart: The Specific Light Output of Cesium Iodide Crystals; p 59-63
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  • 71
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    Significance of medium-energy gamma-ray astronomy in the study of cosmic rays (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The paper examines the medium-energy (about 10-30 MeV) galactic gamma-ray radiation from primary and secondary electrons and calculates the expected gamma-ray distribution for the specific model of Bignami et al. (1975) on the assumption that the cosmic rays are correlated with the matter on the scale of galactic arms. The energy spectrum typical of regions near the galactic center indicates a dramatic shift from a predominantly cosmic-ray nucleonic mechanism at higher energies to a cosmic-ray electron mechanism at the lower energies. This provides a most important and direct means of probing the cosmic-ray electrons as a function of galactic position by making gamma-ray observations in the few to 40 MeV energy range. Medium-energy gamma-ray astronomy is shown to be a valuable tool in galactic research.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 208; Aug. 15
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  • 72
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    Aeroacoustics: Jet noise, combustion and core engine noise (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The papers in this volume deal essentially with the question whether the amplification of noise is due to the jet noise phenomenon or perhaps an interaction of airframe and core engine noise. In the area of jet noise suppression, various promising suppressor concepts are examined. The swirling flow jet noise suppressor is shown to provide significant noise reduction with minimal thrust losses. Progress in the aircraft engine core noise problem is reflected by seven research-type papers. Two possible mechanisms are seen to be responsible for core noise. One is the direct noise radiated from the turbulent combustion in the primary combuster and transmitted through the turbine, passing out the nozzle into the far field. The other mechanism is the noise that is emitted from hot spots being convected through the turbine. Which of these mechanisms (or perhaps both mechanisms) is responsible for core noise, and what are the coupling mechanisms of core engine noise and jet noise are the questions confronting researchers.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
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  • 73
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    Advances in gamma-ray burst astronomy (1976)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The paper reviews the current status of observational research into the highly puzzling problem of cosmic gamma-ray bursts. Up to now there is no convincing temporal or spatial correlation with any known celestial processes or objects. The typical burst source strength is somewhere between 10 to the 26th power ergs and 10 to the 52nd power ergs. A list of 39 confirmed and 9 unconfirmed cosmic gamma-ray bursts observed by satellite is given, showing times of occurrence and in some cases, the size in erg per square centimeter. Several approaches to the problem of source object identification are discussed: (1) accumulation of observation statistics with their present poor resolution and research for correlative phenomena, (2) mapping out celestial source distributions with moderate resolution in order to search for galactic or other anisotropies in direction or to look for repeating source regions, and (3) very high-accuracy localization of the source directions of one or several bursts in order to pinpoint a tiny fraction of the celestial sphere for correlative radio, optical and X-ray studies. Planned future instrumentation for deep space probes and multiple-balloon studies is described.
    Schlagwort(e): SPACE RADIATION
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  • 74
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    A nonlinear theory of cosmic-ray pitch-angle diffusion in homogeneous magnetostatic turbulence (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A plasma strong turbulence, weak coupling, theory is applied to the problem of cosmic-ray pitch-angle scattering in magnetostatic turbulence. The theory used is a rigorous generalization of Weinstock's 'resonance broadening' theory and contains no ad hoc approximations. A detailed calculation is presented for a model of 'slab' turbulence with an exponential correlation function. The results agree well with numerical simulations. The rigidity dependence of the pitch-angle scattering coefficient differs from that found by previous researchers. The differences result from an inadequate treatment of particle trajectories near 90 deg pitch angle in earlier work.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 204; Mar. 15
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  • 75
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    Cosmic-ray positron and negatron spectra between 20 and 800 MeV measured in 1974 (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The flux density of cosmic-ray positrons and electrons was measured by a balloon-borne spark chamber magnetic spectrometer in two flights in an attempt to study the solar modulation of galactic cosmic rays. The total electron flux was found to be about 0.03/cu m/s/sr/MeV between 70 and 800 MeV and to increase toward lower energies, while the positron flux decreased sharply toward lower energies from about 0.008/cu m/s/sr/MeV at 650 MeV and only upper limits were obtained for positrons below 200 MeV. At energies above 180 MeV, the spherically symmetrical Fokker-Planck equation with a diffusion coefficient proportional to the particle rigidity provided a reasonable fit to both positron and total electron data, while at energies below 180 MeV, the data were consistent with a continuation of the same diffusion coefficient and local source of electrons, or a change in the diffusion coefficient to a constant value.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 204; Mar. 15
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  • 76
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    Ionising flux of cosmic background radiation (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The indirect method of estimating the diffuse metagalactic flux of ionizing radiation proposed by Sunyaev (1969) is reconsidered in the light of further studies of the interaction of this radiation with galactic gas. An upper limit is derived for the intensity of the metagalactic background radiation to which the neutral interstellar medium is exposed. This limit on the ionizing radiation flux severely restricts the emission from a galactic corona containing gas in the temperature range 100,000 to 1,000,000 K. An upper limit of 10 to the 29.2 erg/sec/Hz is obtained for the mean luminosity radiated by a quasar in the energy band 40-170 eV. The 21-cm observations examined indicate that further than about 30 kpc from the center of the galaxy self-shielding by H II is possible only when the critical metagalactic ionizing flux is not exceeded.
    Schlagwort(e): SPACE RADIATION
    Materialart: Nature; 260; Apr. 8
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  • 77
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    Solar-cosmic-ray variability (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Schlagwort(e): SPACE RADIATION
    Materialart: Lunar Science Inst., Abstracts of Papers Presented at a Special Session of the Seventh Annual Lunar Science Conference on Utilization of Lunar Materials and Expertise for Large Scale Operations in Space; p 81-86
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  • 78
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    Turbofan compressor dynamics during afterburner transients (1976)
    In:  CASI
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    Publikationsdatum: 2017-10-02
    Beschreibung: The effects of afterburner light-off and shut-down transients on the compressor stability are investigated. The reported experimental results are based on detailed high response pressure and temperature measurements on the TF30-P-3 turbofan engine. The tests were performed in an altitude test chamber simulating high altitude engine operation. It is shown that during both types of transients, flow breaks down in the forward part of the fan bypass duct. At a sufficiently low engine inlet pressure this resulted in a compressor stall. Complete flow breakdown within the compressor was preceded by a rotating stall. At some locations in the compressor, rotating stall cells initially extended only through part of the blade span. For the shutdown transient the time between first and last detected occurrence of rotating stall is related to the flow Reynolds number. An attempt was made to deduce the number and speed of propagation of rotating stall cells.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: AGARD Unsteady Phenomena in Turbomachinery; 12 p
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  • 79
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    Assessment of Variable-Cycle Engines for Supersonic Transports (1976)
    In:  CASI
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    Publikationsdatum: 2017-10-02
    Beschreibung: Propulsion systems are evaluated in terms of relative aircraft range for a fixed payload and takeoff gross weight with a design cruise Mach number of 2.7. In order to put the performance of these engines in perspective, a comparison of these engines and the former U.S. SST engine is made with an idealized variable cycle engine whose performance at all operating points matches that of an optimized point design cycle within specified limits. Range comparisons are made with and without noise level constraints to determine the influence of noise upon cycle selection. The critical areas requiring new or improved technology for each cycle are delineated.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: AGARD Variable Geometry and Multicycle Eng.; 19 p
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  • 80
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    Fabrication and evaluation of advanced titanium and composite structural panels (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Advanced manufacturing methods for titanium and composite material structures are being developed and evaluated. The focus for the manufacturing effort is the fabrication of full-scale structural panels which replace an existing shear panel on the upper wing surface of the NASA YF-12 aircraft. The program involves design, fabrication, ground testing, and Mach 3 flight service of full-scale structural panels and laboratory testing of representative structural element specimens.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Proc. of the SCAR Conf., Pt. 2,; 15 p
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  • 81
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    New advancements in titanium technology and their cost and weight benefits (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: A process that combines both the superplastic and diffusion bonding properties of metal into one concurrent operation is being developed. Estimates using this technology have indicated that this combined process will result in cost savings up to 70 percent when compared to conventional construction methods, while also saving weight. Many structural forms are possible including sandwich structures made by expanding face sheets and core against die forms. The classic difficulties normally associated with fabricating sandwich structures, such as parts fit-up, close tolerances, adhesive or braze alloy strength, do not exist with this technique. The total potential of Rockwell's patented new processes is limited only by the ingenuity of the designer and is expected to affect significantly future airplane concepts and criteria.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: NASA. Langley Res. Center Proc. of the SCAR Conf., Pt. 2,; 26 p
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  • 82
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    Fatigue of titanium alloys in a supersonic-cruise airplane environment (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The test programs conducted by several aerospace companies and NASA, summarized in this paper, studied several titanium materials previously identified as having high potential for application to supersonic cruise airplane structures. These studies demonstrate that the temperature (560 K) by itself produced no significant degradation of the materials. However, the fatigue resistance of titanium-alloy structures, in which thermal and loading effects are combined, has been studied insufficiently. The predominant topic for future study of fatigue problems in Mach 3 structures should be the influences of thermal stress particularly, the effects of thermal stress on failure location.
    Schlagwort(e): METALLIC MATERIALS
    Materialart: Proc. of the SCAR Conf., Pt. 2,; 18 p
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  • 83
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    Considerations of high altitude emissions (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The status of the Federal Aviation Administration's High Altitude Pollution Program is described which was instituted to develop the detailed quantitative information needed to judge whether or not regulatory action to limit such exhaust emissions would be necessary. The complexities of this question and the nature and magnitude of uncertainties still present in our scientific understanding of the potential interactions between aircraft exhaust emissions and stratospheric ozone and climate are reviewed. The direction and scope of future Federal and international activities are described.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Langley Res. Center Proc. of the SCAR Conf., Pt. 2,; 10 p
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  • 84
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    Technology for controlling emissions of oxides of nitrogen from supersonic cruise aircraft (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Various experiments are sponsored and conducted by NASA to explore the potential of advanced combustion techniques for controlling aircraft engine emissions into the upper atmosphere. Of particular concern are the oxide of nitrogen (NOx) emissions into the stratosphere. The experiments utilize a wide variety of approaches varying from advanced combustor concepts to fundamental flame tube experiments. Results are presented which indicate that substantial reductions in cruise NOx emissions should be achievable in future aircraft engines. A major NASA program is described which focuses the many fundamental experiments into a planned evolution and demonstration of the prevaporized-premixed combustion technique in a full-scale engine.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Pt. 2,; 22 p
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  • 85
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    Composite materials research in support of supersonic propulsion systems (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Two engine components, fan blades and exhaust systems, were selected for composite materials development efforts in support of the supersonic cruise aircraft research (SCAR) engine program. The materials selected were boron/aluminum for fan blades and silicon carbide/superalloy sheet for the exhaust system. The current status of the research into applying these two composite materials to SCAR engines is reviewed.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Part 1; p 457-468
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  • 86
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    YF-12 propulsion research program and results (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The objectives and status of the propulsion program, along with the results acquired in the various technology areas, are discussed. The instrumentation requirements for and experience with flight testing the propulsion systems at high supersonic cruise are reported. Propulsion system performance differences between wind tunnel and flight are given. The effects of high frequency flow fluctuations (transients) on the stability of the propulsion system are described, and shock position control is evaluated.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Part 1; p 417-456
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  • 87
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    Control of propulsion systems for supersonic cruise aircraft (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The propulsion control requirements of supersonic aircraft are presented. Integration of inlet, engine, and airframe controls is discussed. The application of recent control theory developments to propulsion control design is described. Control component designs for achieving reliable, responsive propulsion control are also discussed.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Part 1; p 399-415
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  • 88
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    Supersonic cruise inlets for variable-cycle engines (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The performance of candidate supersonic cruise inlets is reviewed and the aerodynamic installation penalties for each type are defined. The main characteristics that affect the airflow schedules of variable cycle engines are defined. These schedules are compared with the airflow schedules of the candidate inlets, and appropriate inlets are matched to the variable-cycle engine characteristics. Auxiliary inlets are also considered.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Part 1; p 387-397
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  • 89
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    Variable stream control engine concept for advanced supersonic aircraft: Features and benefits (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The Variable Stream Control Engine is studied for advanced supersonic cruise aircraft. Significant environmental and performance improvements relative to first generation supersonic turbojet engines are cited. Two separate flow streams, each with independent burner and nozzle systems are incorporated within the engine. By unique control of the exhaust temperatures and velocities in two coannular streams, significant reduction in jet noise is obtained.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Langley Res. Center Proc. of the SCAR Conf., Part 1; p 341-352
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  • 90
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    Advanced Supersonic Technology Study: Engine Program Summary. Supersonic Propulsion: 1971 to 1976 (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Sustained supersonic cruise propulsion systems for military applications are studied. The J79-5 in the Mach 2 B-58; YJ93 in the Mach 3.0 B-70 and the current F101 in the B-1, are all examples of military propulsion systems and airplanes operated at sustained supersonic cruise speeds. The Mach 2.7 B2707 transport powered by GE4 turbojet engines was the only non-military, sustained supersonic cruise vehicle intended for commercial passenger service.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA Proc. of the SCAR Conf., Part 1; p 353-370
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  • 91
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    Component test program for variable-cycle engines (1976)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Variable cycle engine (VCE) concepts for a supersonic cruise aircraft were studied. These VCE concepts incorporate unique critical components and flow path arrangements that provide good performance at both supersonic and subsonic cruise and appear to be economically and environmentally viable. Certain technologies were identified as critical to the successful development of these engine concepts and require considerable development and testing. The feasibility and readiness of the most critical VCE technologies, was assessed, a VCE component test program was initiated. The variable stream control engine (VSCE) component test program, tested and evaluated an efficient low emission duct burner and a quiet coannular ejector nozzle at the rear of a rematched F100 engine.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Proc. of the SCAR Conf., Part 1; p 371-385
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  • 92
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    Review of measurement and testing problems (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The exhaust emission test was designed to measure hydrocarbons, carbon monoxide, and oxides of nitrogen concentrations and determine mass emissions through calculations during a simulated aircraft landing-takeoff cycle. The calculations required to convert exhaust emission concentrations (raw emission measurements) into mass emissions were emphasized.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 357-378
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 93
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    Review of measurement and testing problems (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Good instrumentation was required to obtain reliable and repeatable baseline data. Problems that were encountered in developing such a total system were: (1) accurate airflow measurement, (2) precise fuel flow measurement, and (3) the instrumentation used for pollutant measurement was susceptible to frequent malfunctions. Span gas quality had a significant effect on emissions test results. The Spindt method was used in the piston aircraft emissions program. The Spindt method provided a comparative computational procedure for fuel/air ratio based on measured emissions concentrations.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 337-356
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 94
    facet.materialart.
    Unbekannt
    Summary of the general aviation manufacturers' position on aircraft piston engine emissions (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The General Aviation Manufacturers recommended that the EPA rescind the aircraft piston engine emissions regulations currently on the books. The reason was the very small emission reduction potential and the very poor benefit-cost ratio involved in this form of emission reduction. The limited resources of this industry can far better be devoted to items of much greater benefit to the citizens of this country - reducing noise, improving fuel efficiency (which will incidently reduce exhaust emissions), and improving the safety, operational, and economic aspects of aircraft, all far greater contributions to our total national transportation system.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 329-336
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 95
    facet.materialart.
    Unbekannt
    Alternative general-aircraft engines (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The most promising alternative engine (or engines) for application to general aircraft in the post-1985 time period was defined, and the level of technology was cited to the point where confident development of a new engine can begin early in the 1980's. Low emissions, multifuel capability, and fuel economy were emphasized. Six alternative propulsion concepts were considered to be viable candidates for future general-aircraft application: the advanced spark-ignition piston, rotary combustion, two- and four-stroke diesel, Stirling, and gas turbine engines.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aircraft Piston Eng. Exhaust Emissions Symp.; p 315-328
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 96
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    Unbekannt
    Emissions and new technology programs for conventional spark-ignition aircraft engines (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A long-range technology plan in support of general aviation engines was formulated and is being implemented at the Lewis Research Center. The overall program was described, and that part of the program that represents the in-house effort at Lewis was presented in detail. Three areas of government and industry effort involving conventional general-aviation piston engines were part of a coordinated overall plan: (1) FAA/NASA joint program, (2) NASA contract exhaust emissions pollution reduction program, and (3) NASA in-house emissions reduction and new technology program.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aircraft Piston Eng. Exhaust Emissions Symp.; p 295-314
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 97
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    Future development programs (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The emission problem or source points were defined and new materials, hardware, or operational procedures were developed to exercise the trends defined by the data collected. The programs to reduce the emission output of aircraft powerplants were listed. Continued establishment of baseline emissions for various engine models, continued characterization of effect of production tolerances on emissions, carbureted engine development and flight tests, and cylinder cooling/fin design programs were several of the programs investigated.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 283-294
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 98
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    Unbekannt
    Avco Lycoming/NASA contract status (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The standards promulgated by the Environmental Protection Agency (EPA) for carbon monoxide (CO), unburned hydrocarbon (HC), and oxides-of-nitrogen (NOx) emissions were the basis in a study of ways to reduce emissions from aircraft piston engines. A variable valve timing system, ultrasonic fuel atomization, and ignition system changes were postulated.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 255-274
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 99
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    Unbekannt
    Introduction to NASA contracts (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The NASA Lewis Research Center issued requests for proposal to Avco Lycoming and Teledyne Continental Motors for a contractual effort to establish and demonstrate engine modifications to reduce exhaust emissions safely with minimum adverse effects on cost, weight, and fuel economy. The secondary objective was reducing fuel consumption.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aircraft Piston Eng. Exhaust Emissions Symp.; p 225-226
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 100
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    Unbekannt
    Future development programs (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A company program was planned which has a main drive to develop those emission reduction concepts that have the promise of earliest success. These programs were proposed in an attempt to enhance existing engine systems, exploiting their potential for emission reduction as far as is compatible with retaining the well established features in them that are well understood and in current production. The intended programs identified in the area of new concepts were: (1) upgrading the TCM fuel system, (2) evaluation of accelerator pump, (3) reduced cooling requirement, and (4) variable spark timing.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: NASA. Lewis Res. Center Aircraft Piston Eng. Exhaust Emissions Symp.; p 275-282
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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