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  • ASTROPHYSICS  (2.155)
  • AERODYNAMICS  (2.110)
  • AIRCRAFT PROPULSION AND POWER  (1.211)
  • 42.75
  • Biochemistry and Biotechnology
  • FLUID MECHANICS AND HEAT TRANSFER
  • Seismology
  • 1975-1979  (7.669)
Sammlung
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  • 1
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    Unbekannt
    Are foreshocks distinctive? Evidence from the 1966 Parkfield and the 1975 Oroville, California sequences (1979)
    In:  Bull. Seism. Soc. Am., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 69, no. 4, pp. 1027-1038, pp. L09611
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Fore-shocks ; Earthquake ; Discrimination ; Earthquake precursor: prediction research ; Spectrum ; Corner frequency ; Seismology ; Body waves ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    Subduction of the Nazca plate beneath Peru: Evidence from spatial distribution of earthquakes (1979)
    In:  Geophys. J. R. astr. Soc., Warszawa, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 57, no. 1, pp. 537-555, pp. 2121
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Subduction zone ; Seismicity ; Seismology ; South ; America ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Attenuation of P and S waves diffracted around the core (1979)
    In:  Geophys. J. R. astr. Soc., London, Elsevier, vol. 57, no. 8, pp. 353-379, pp. 2083, (ISBN 1-86239-117-3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): earth mantle ; Seismology ; P-waves ; Shear waves ; Q-structure ; Quality factor ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Unbekannt
    P and S waves diffracted around the core and the velocity structure at the base of the mantle (1979)
    In:  Geophys. J. R. astr. Soc., London, Elsevier, vol. 57, no. 8, pp. 381-395, pp. 2083, (ISBN 1-86239-117-3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): earth mantle ; Seismology ; P-waves ; Shear waves ; Q-structure ; Quality factor ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
    facet.materialart.
    Unbekannt
    New Zealand and Antarctic seismology (1979)
    In:  Earthquake Information Bulletin, Münster, Amer. Sc., vol. 11, no. 4, pp. 170-174, pp. 1228, (ISBN 0-471-26610-8)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Review article ; Project report/description
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
    facet.materialart.
    Unbekannt
    A moment magnitude scale (1979)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 84, no. 7055, pp. 2348-2350, pp. B05S07, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Magnitude ; Source parameters ; seismic Moment ; Statistical investigations ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    Unbekannt
    A semi-empirical approach to prediction of long-period ground motions from great earthquakes (1979)
    In:  Bull. Seism. Soc. Am., Amsterdam, Elsevier Scientific Publishing Company, vol. 69, no. 2, pp. 1645-1670, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Strong motions ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
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    Unbekannt
    A review of the 1356 Basel earthquake: Basic data (1979)
    In:  Tectonophys., Bonn, 3-4, vol. 53, no. 10, pp. 325-333, pp. L10306, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Earthquake
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    Unbekannt
    The deep structure of the continents (1979)
    In:  Sci. Am., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 240 , no. 1, pp. 92-107, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Earth model, also for more shallow analyses ! ; Lithosphere ; earth mantle ; SciAm
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 10
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    Unbekannt
    A modified form of the Gutenberg-Richter magnitude-frequency relation (1979)
    In:  Bull. Seism. Soc. Am., Kunming, China, 4, vol. 69, no. 4, pp. 1209-1214, pp. L13613, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Magnitude ; Seismology ; Seismicity ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 11
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    Unbekannt
    Magnitude corrections for attenuation in the upper mantle (1979)
    In:  Geophys. J. R. astr. Soc., Zagreb, 3-4, vol. 57, no. 1, pp. 609-638, pp. B06305, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Attenuation ; Inelastic ; Magnitude ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 12
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    Unbekannt
    Shear velocity structure in the eastern United States from the inversion of surface-wave group and phase velocities (1979)
    In:  Bull. Seism. Soc. Am., Luxembourg, Conseil de l'Europe, vol. 69, no. 1, pp. 1133-1148, pp. L09610, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Shear waves ; Surface waves ; Phase velocity ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 13
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    Unbekannt
    Seismic source theory (1979)
    In:  Rev. Geophys. Space Phys., San Francisco, Schweizerbart'sche Verlagsbuchhandlung, vol. 17, no. B10, pp. 328-336, pp. B10404, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Source ; Seismology ; Review article
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 14
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    Unbekannt
    Structure under Mount Rainier, Washington, inferred from teleseismic body waves (1979)
    In:  J. Geophys. Res., Basel, Elsevier Science Publishers, vol. 84, no. B9, pp. 4749-4762, pp. L15S20, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Teleseismic events ; Seismology ; Volcanology ; Velocity depth profile ; USA ; Geol. aspects ; Body waves ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 15
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    Unbekannt
    Comment on "Dispersion function computations for unlimited frequency values" by Anas Abo Zena (1979)
    In:  Geophys. J. R. astr. Soc., Hannover, Conseil de l'Europe, vol. 59, no. 1, pp. 315-323, pp. L24314, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Dispersion ; Frequency ; Seismology ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 16
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    Unbekannt
    Observations of sPn from Swabian Alb earthquakes at the GRF-Array (1979)
    In:  J. Geophys., Würzburg, Physica-Verlag, vol. 45, no. 1, pp. 337-340, pp. L24313, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): P-waves ; Seismic arrays ; Seismology ; ConvolutionR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 17
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    Unbekannt
    On the relation between seismic moment and stress drop in the presence of stress and strength heterogeneity (1979)
    In:  J. Geophys. Res., San Francisco, Pergamon, vol. 84, no. B5, pp. 2243-2250, pp. B05315, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): seismic Moment ; Stress drop ; Stress ; Strength ; Seismology ; Modelling ; Source parameters ; Inhomogeneity ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 18
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    Unbekannt
    Magnitude corrections for attenuation in the upper mantle (1979)
    In:  Geophys. J. R. astr. Soc., Zagreb, 3-4, vol. 57, no. 5372, pp. 609-638, pp. B06305, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Attenuation ; Magnitude ; Nuclear explosion ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 19
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    Unbekannt
    Studies of seismicity and selected focal mechanisms in Switzerland (1979)
    In:  Schweiz. mineral. petrogr. Mitt., Bonn, 3-4, vol. 59, no. 10, pp. 127-132, pp. L10306, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismicity ; Seismology ; Fault plane solution, focal mechanism ; Muller
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 20
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    Observations relevant to seismic driving stress, stress drop, and efficiency (1979)
    In:  J. Geophys. Res., New York, August, vol. 84, no. 3-4, pp. 2251-2261, pp. 1610, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Stress ; Stress drop ; Energy (of earthquakes) ; Source parameters ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 21
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    Unbekannt
    An integral equation for dynamic elastic response of an isolated 3-D crack (1979)
    In:  Wave Motion, Tulsa, 3-4, vol. 1, no. 13, pp. 187-192, pp. B10303, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Dislocation ; cracks and fractures (.NE. fracturing) ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 22
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    Unbekannt
    Aleutian subduction zone seismicity, volcano-trench separation, and their relation to great thrust-type earthquakes (1979)
    In:  J. Geophys. Res., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 84, no. 5, pp. 4583-4591, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Subduction zone ; Seismology ; Seismicity ; Volcanology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 23
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    Unbekannt
    On the relation between Modified Mercalli intensity and body-wave magnitude (1979)
    In:  Bull. Seism. Soc. Am., Dordrecht, Martinus Nijhoff Publishers, vol. 69, no. 3, pp. 893-909, pp. L11307, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Intensity ; Magnitude ; BSSA ; body wave Magnitude
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 24
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    On the observability of isotropic seismic sources: the July 31, 1970 Colombian earthquake (1979)
    In:  Phys. Earth Plan. Interiors, Kyoto, AGU, vol. 18, no. B1, pp. 176-196, pp. L24302, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Earthquake ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 25
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    Unbekannt
    An in situ velocity study: the Stone Canyon well (1979)
    In:  J. Geophys. Res., Berlin, Pergamon, vol. 84, no. B2, pp. 672-678, pp. B04306, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Velocity ; Seismology ; Earthquake precursor: prediction research ; Earthquake precursor: Vp/Vs anomalies ; JGR ; Body waves
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 26
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    Seismic signal detection and parameter estimation (1979)
    In:  Geophys. Prosp., Luxembourg, Conseil de l'Europe, vol. 27, no. 1, pp. 1-15, pp. 1068, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Detectors ; Seismology ; Statistical investigations ; CoherencyE
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 27
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    Elastic Waves in the Earth (1979)
    Elsevier
    In:  Amsterdam, 490 pp., Elsevier, vol. 11, no. Publ. No. 12, pp. 127, (3-540-43395-3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Textbook of geophysics
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 28
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    Dispersion function computations for unlimited frequency values (1979)
    In:  Geophys. J., vol. 58, no. B11, pp. 91-105
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Layers ; Dispersion ; Frequency ; Synthetic seismograms
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 29
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    Unbekannt
    Determination of geometric and dynamic focal parameters for some strong intermediate earthquakes in the Vrancea region (1979)
    In:  Rev. Roum. Géol., Géophys. et Géogr. - Géophysique, Münster, 3, vol. 23, no. 3-4, pp. 39-49, pp. L12311, (ISBN 0-471-26610-8)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Source parameters ; Seismology ; EUROPROBE (Geol. and Geophys. in eastern Europe)
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 30
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    Unbekannt
    Travel time inversion: A geometrical approach (1979)
    In:  J. Geophys. Res., Berlin, Inst. Electrical & Electronics Engineers, vol. 84, no. 4, pp. 3615-3622, pp. B04307, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Travel time ; Inversion ; Data analysis / ~ processing ; Seismics (controlled source seismology) ; Seismology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 31
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    Unbekannt
    Instantaneous power spectra (1979)
    Naval Ocean Systems Center
    In:  report, San Diego, Naval Ocean Systems Center, vol. 1, no. paper SPWLA 90-C, pp. M1-M4, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Seismics (controlled source seismology) ; Power spectrum ; Spectrum
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 32
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    Unbekannt
    Spektralanalyse seismischer Wellen zur Beschreibung des Scherbruches bei den Erdbeben in Friaul (1979)
    Inst. f. Geophys., Univ. Stuttgart
    In:  Diplomarbeit, Granada, 10-12 June 1999, Inst. f. Geophys., Univ. Stuttgart, vol. 339-350, no. 32, pp. 103-108, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Spectral analysis ; Spectrum ; Earthquake ; Seismology ; Fracture
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 33
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    Numerical modeling of transient wave fields in seismology and seismic prospecting (1979)
    In:  Preprint, Novosibirsk, Air Force Geophysics Laboratory, no. AFGL-TR-87-0230, pp. 103-155
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Modelling ; Seismology ; Seismics (controlled source seismology) ; Wave propagation
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 34
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    Unbekannt
    Dynamic Green's functions for layered media and application to boundary-value problem (1979)
    Univ. Calif.
    In:  Ph.D. Thesis, San Diego, Univ. Calif., vol. 11, no. PEER Utilities Pgm. Rep. 2000/17, 24 pp., pp. 207
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Modelling ; Layers ; Synthetic seismograms ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 35
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    Unbekannt
    Geologische Erdbebenphänomene im Gefolge von Nuklear- und Molecularexplosionen (1979)
    Forschungsinstitut für militärische Bautechnik
    In:  report, Zürich, Forschungsinstitut für militärische Bautechnik, vol. 10, no. FMB 79.10, pp. 2985-3018
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Nuclear explosion ; Seismology ; Buechi ; Buchi
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 36
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    Unbekannt
    Eine anormale Geschwindigkeitsstruktur im oberen Erdmantel unter den Ostalpen, abgeleitet aus teleseismischen Laufzeit Residuen der Stationen Schlegeis und Gräfenberg (1979)
    Ludwig-Maximilians-Universität
    In:  Diplomarbeit, München, Ludwig-Maximilians-Universität, vol. 10, no. 28, pp. 309-314
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Teleseismic events ; Velocity analysis ; earth mantle ; Seismology ; Bruestle ; Brustle
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 37
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    Fault plane solutions using relative amplitudes of P and surface reflections: further studies (1979)
    In:  Geophys. J. R. astr. Soc., Basle, Wiley, vol. 60, no. 5441, pp. 459-487, pp. 1264, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Source ; Seismology ; Fault plane solution, focal mechanism ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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  • 38
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    Die Anwendung von Vorhersagefiltern zur Ereigniserkennung bei digitalen Breitbandseismogrammen (1979)
    Bundesanstalt f. Geowissenschaften und Rohstoffe
    In:  Hannover, Bundesanstalt f. Geowissenschaften und Rohstoffe, vol. 25, no. Publ. No. 12, pp. 95-104, (ISBN: 0-08-043930-6)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Detectors ; Filter- ; Broad-band
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 39
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    Erdbeben (1979)
    Hallwag
    In:  Stuttgart, Hallwag, vol. 30, no. Publ. No. 12, pp. 95-104, (ISBN 0-865-42078-5)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Earthquake ; Seismology ; Textbook of geophysics
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 40
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    CEDAR: An approach to the computer automation of short period local seismic networks (1979)
    Caltech
    In:  Ph.D. Thesis, Pasadena, CA., Caltech, vol. C 560, 183 pp., no. PL-TR-91-2212(I), pp. 79-84, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Detectors ; sta ; Seismology ; Seismic networks ; High frequency ...
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    BIBLIOGRAFIE SEISMOLOGIE
  • 41
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    A first order scattering solution for modeling elastic wave codas. Part 1. The acoustic case (1979)
    In:  Preprint, Beijing, Halliburton Logging Services, vol. C 560, 183 pp., no. PL-TR-91-2212(II), pp. 938-939, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Seismics (controlled source seismology) ; Scattering ; Coda (waves, ~ of seismograms) ; Wave propagation ; Acoustics
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 42
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    Die Bestimmung der seismischen Wellenenergie im Zeitbereich unter Verwendung der digitalen Registrierungen des Seismologischen Zentralobservatoriums Gräfenberg (1979)
    Inst. f. Meteorol. und Geophys., Goethe Univ. Frankfurt
    In:  Diplomarbeit, Roma, Inst. f. Meteorol. und Geophys., Goethe Univ. Frankfurt, vol. C 560, 183 pp., no. 78 (?), pp. 193-210, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Seismic arrays ; Data analysis / ~ processing ; Energy (of earthquakes)
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 43
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    Deep structure of the Earth's crust and upper mantle in the USSR according to geophysical and seismological data (1979)
    Lawrence Livermore National Laboratory
    In:  rept., Livermore, Calif., Lawrence Livermore National Laboratory, vol. 10, no. UCID-18099, pp. 1358-1361, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Review article ; Deep seismic sounding (espec. cont. crust) ; CRUST ; earth mantle ; Seismology ; EUROPROBE (Geol. and Geophys. in eastern Europe)
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  • 44
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    Crustal structure of the western United States (1979)
    U. S. Geol. Surv.
    In:  Prof. Paper, Menlo Park, California, U. S. Geol. Surv., vol. 1034, no. 77-3, pp. 1-74, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Deep seismic sounding (espec. cont. crust) ; Velocity depth profile ; USGS ; USA ; Seismics (controlled source seismology) ; Seismology
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  • 45
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    Surface wave focal mechanisms for eastern North American earthquakes with tectonic implications (1979)
    In:  J. Geophys. Res., Zagreb, Conseil de l'Europe, vol. 84, no. 4, pp. 3543-3552, pp. L02307, (ISSN 0343-5164)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Fault plane solution, focal mechanism ; Surface waves ; Tectonics ; Source ; JGR
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    BIBLIOGRAFIE SEISMOLOGIE
  • 46
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    SH-wave generation by dislocation sources - A numerical study (1979)
    In:  Bull. Seism. Soc. Am., Zagreb, Conseil de l'Europe, vol. 69, no. 4, pp. 1-15, pp. L02307, (ISSN 0343-5164)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Dislocation ; SH waves ; Source ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 47
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    Determination of the seismic design parameters: a stochastic approach (1979)
    Stanford University, California
    In:  Ph.D. Thesis, La Jolla, CA, Stanford University, California, vol. 1034, no. 77-767, pp. 293-297, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Seismology ; Seismic networks ; Seismic arrays ; Statistical investigations
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    BIBLIOGRAFIE SEISMOLOGIE
  • 48
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    HYPOELLIPSE - A computer program for determining local earthquake hypocentral parameters, magnitude, and first motion pattern (1979)
    U. S. Geol. Surv.
    In:  Open-File Report, Houston, U. S. Geol. Surv., vol. C 560, 183 pp., no. 79-431, pp. 1-57, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Source parameters ; Seismology ; Magnitude ; Hypocentral depth ; Location ; software ; USGS
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    BIBLIOGRAFIE SEISMOLOGIE
  • 49
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    Manual of seismological observatory practice (1979)
    NOAA, U. S. Department of Commerce
    In:  report, Houston, NOAA, U. S. Department of Commerce, vol. 10, no. SE-20, pp. 206-209, (ISBN 0 08 042822 3)
    Details
    Publikationsdatum: 1979
    Schlagwort(e): Handbook of geophysics ; Seismology ; Instruments ; BIBTEX?
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  • 50
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    Aircraft Energy Efficiency (ACEE) status report (1979)
    In:  CASI
    Details
    Publikationsdatum: 2009-11-17
    Beschreibung: Fuel efficiency in aeronautics, for fuel conservation in general as well as for its effect on commercial aircraft operating economics is considered. Projects of the Aircraft Energy Efficiency Program related to propulsion are emphasized. These include: (1) engine component improvement, directed at performance improvement and engine diagnostics for prolonged service life; (2) energy efficient engine, directed at proving the technology base for the next generation of turbofan engines; and (3) advanced turboprop, directed at advancing the technology of turboprop powered aircraft to a point suitable for commercial airline service. Progress in these technology areas is reported.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 1-58
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  • 51
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    High-performance-vehicle technology (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: Propulsion needs of high performance military aircraft are discussed. Inlet performance, nozzle performance and cooling, and afterburner performance are covered. It is concluded that nonaxisymmetric nozzles provide cleaner external lines and enhanced maneuverability, but the internal flows are more complex. Swirl afterburners show promise for enhanced performance in the high altitude, low Mach number region.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 445-462
    Format: text
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  • 52
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    Vertical Takeoff and Landing (VTOL) propulsion technology (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Propulsion problems and advanced technology requirements of VTOL aircraft are discussed. Specific topics covered include inlets with high angle of attack capability, rapid thrust modulation fans, and propulsion-system/aircraft-control integration.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 409-444
    Format: text
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  • 53
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    Hypersonic propulsion (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Research on hydrogen fueled scramjet engines for hypersonic flight is reviewed. Component developments, computational methods, and preliminary ground tests of subscale scramjet engine modules at Mach 4 and 7 are emphasized. Airframe integration, structures, and flow diagnostics are also discussed. It is shown that mixed-mode perpendicular and parallel fuel injection controls heat release over a wide Mach range and the fixed geometry inlet gives good performance over a wide range of Mach numbers.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 387-408
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  • 54
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    Control technology (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: An overview of engine control technology is presented with emphasis on gas turbine engine controls. The role of the government, and NASA in particular, in advancing this technology is discussed.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 329-344
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  • 55
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    Supersonic propulsion technology (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Propulsion concepts for commercial supersonic transports are discussed. It is concluded that variable cycle engines, together with advanced supersonic inlets and low noise coannular nozzles, provide good operating performance for both supersonic and subsonic flight. In addition, they are reasonably quiet during takeoff and landing and have acceptable exhaust emissions.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 345-386
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  • 56
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    Mechanical components (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: Research on bearings, gears, seals, and rotor dynamics (specifically high speed balancing and dampers) is presented. The research pertains to problems in both aircraft turbine engines and helicopter transmissions.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 273-308
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  • 57
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    Instrumentation technology (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Some of the efforts made in applying technologically new tools to today's propulsion measurement problems are described. They include: (1) a blade-tip clearance system; (2) a pulsed thermocouple system used to measure gas temperature with a thermocouple at temperatures above the melting point of the thermocouple; (3) an optical technique for measuring blade flutter; (4) a probe for dynamic flow and flow angle measurement; and (5) a laser anemometer system for rapidly mapping the flow profiles between the blades of a rotating compressor.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 309-328
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  • 58
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    Turbomachinery technology (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: A technology assessment of turbomachinery is presented. The design of the fan, compressor, and turbine components for future advanced aircraft engines is discussed. Basic flow characteristics in compressors and turbines and the heat transfer phenomena in cooled turbines are also discussed.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 231-272
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  • 59
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    Computational fluid mechanics of internal flow (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Major solution techniques for internal computational fluid mechanics are discussed and some examples are presented. The major steps involved in developing a large computer code are then discussed.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 187-230
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  • 60
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    Alternative jet aircraft fuels (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: Potential changes in jet aircraft fuel specifications due to shifts in supply and quality of refinery feedstocks are discussed with emphasis on the effects these changes would have on the performance and durability of aircraft engines and fuel systems. Combustion characteristics, fuel thermal stability, and fuel pumpability at low temperature are among the factors considered. Combustor and fuel system technology needs for broad specification fuels are reviewed including prevention of fuel system fouling and fuel system technology for fuels with higher freezing points.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 129-148
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  • 61
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    Materials and structures technology (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: Materials and structures performance limitations, particularly for the hot section of the engine in which these limitations limit the life of components, are considered. Failure modes for components such as blades, vanes, and combustors and how they are affected by the environment for such components are discussed. Methods used to improve the materials used for such components are: (1) application of directional structures to turbine components for high strength at high temperatures; (2) improved coatings to increase oxidation and corrosion resistance; (3) increase strength and stiffness with reduced weight by applying higher specific properties of composite materials; and (4) cost effective processing such as near net shape powder methods applied to disks. Life prediction techniques developed to predict component life accurately in advance of service and progress in improving the intermediate and cold section components of turbine engines are covered.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 149-186
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  • 62
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    Noise reduction (1979)
    In:  CASI
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    Publikationsdatum: 2006-07-16
    Beschreibung: The turbofan engine's noise-producing components are discussed in terms of efficient and economical noise reduction techniques that do not penalize the engine performance or weight significantly. Specific topics covered include fan noise, acoustic suppression, jet noise technology, combustor noise, and aircraft noise prediction.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 85-128
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  • 63
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    Emission reduction (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-16
    Beschreibung: Control of the gaseous pollutant emissions of aircraft engines is considered in terms of the emission standards for six classes of aircraft engines. Emphasis is placed on combustor design concepts to significantly reduce emissions levels and lean-burning techniques to lower flame temperature, to reduce the oxides of nitrogen in the gaseous emissions.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: Aeropropulsion 1979; p 59-84
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  • 64
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    A numerical comparison with an exact solution for the transient response of a cylinder immersed in a fluid (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-07-02
    Beschreibung: The transient response of an elastic cylindrical shell immersed in an acoustic media that is engulfed by a plane wave is determined numerically. The method applies to the USA-STAGS code which utilizes the finite element method for the structural analysis and the doubly asymptotic approximation for the fluid-structure interaction. The calculations are compared to an exact analysis for two separate loading cases: a plane step wave and an exponentially decaying plane wave.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 3; p 23-28
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  • 65
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    Executive summary of Aircraft Icing Specialists Workshop (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: In a period of escalating development costs for new aircraft, there is growing interest in a renewed and coordinated icing research effort to achieve an updating or modernization of each aspect of the technological issues that are involved. This includes the data base, analysis methods, test techniques, and test facilities.
    Schlagwort(e): AERODYNAMICS
    Materialart: Aircraft Icing; p 1-16
    Format: text
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  • 66
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    Precise determination of the distances of galaxies (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: The use of the Space Telescope in the determination of the distances of galaxies is examined. The Space Telescope can check the local extragalactic distance scale to within 10-15 percent. The determination of relative distances of cosmic standard candles, viz. brightest M-supergiants and SNe I in E galaxies, is discussed. The M-supergiants map the velocity field out to v sub o approx. 3000 km s(-1) thus providing a firm basis for the determination of H sub o (global) from local distances, and the possibility to derive precise distances of all nearby field galaxies from their recession velocities. Photometry of the SNe I out to z = 0.5 leads to a direct determination of q sub o via the Hubble diagram, and the form of their light curves offers a fundamental test on the nature of redshifts. Other calculations are discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Marshall Space Flight Center Sci. Res. with the Space Telescope; p 263-293
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  • 67
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    Safety hazard of aircraft icing (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The problem of aircraft icing is reported as well as the type of aircraft affected, the pilots involved, and an identification of the areas where reduction in icing accidents are readily accomplished.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 21-27
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  • 68
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    Requirements for predictions and real-time monitoring for the study of travelling interplanetary phenomena (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Physical processes within quiescent as well as disturbed flows of solar wind plasma, energetic particles, and magnetic and electric fields from the Sun are considered. Specifically, travelling interplanetary phenomena to be studied during the years of the solar maximum of solar cycle 21 are covered. It is noted that predictions, while needed for long range, logistical planning, is secondary to the requirements of synoptic real time monitoring over a wide range of particle energies and spectral bandwidths.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 340-345
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  • 69
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    The problems of cosmology (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Three examples that illustrate the expected role of the Space Telescope in cosmological investigations are described addressing the distribution of globular star clusters, universe expansion, and other classical cosmological problems.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Marshall Space Flight Center Sci. Res. with the Space Telescope; p 295-312
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  • 70
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    The central regions of active galaxies and quasars (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Theories describing the central regions of nonthermal extragalactic sources (radio galaxies, Seyfert nuclei, quasars, etc.) are examined in the light of the experimental possibilities afforded by the Space Telescope. In particular, the theory which proposes the accretion of stars or gas onto a black hole as the explanation of the central engine is discussed. Planned observations directed towards the problem of the mass, size, and structure of the central engine, and the phenomenological questions regarding the general environment of the central engine are outlined.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Marshall Space Flight Center Sci. Res. with the Space Telescope; p 197-214
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  • 71
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    Luminosity functions and evolution of globular clusters (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: The stellar dynamics of globular clusters are addressed in terms of luminosity functions, chemical topics, and dynamical topics
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Marshall Space Flight Center Sci. Res. with the Space Telescope; p 139-150
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  • 72
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    Civil Helicopter icing problems (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The ice capabilities of rotary wing aircraft are examined. Recommendations are given to improve the inadequacies of the weather forecasts pertaining to ice, and to adopt a low maintenance anti-ice system.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 29-30
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  • 73
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    Overview of helicopter ice protection system developments (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: Helicopter ice protection design criteria was developed and technological shortcoming in meeting helicopter mission requirements is that of helicopter rotor blade ice protection. Airframe components are protected using existing technology while the rotor blade protected using the cyclic electrothermal deicing concept.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 39-65
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  • 74
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    A review of the icing situation from the standpoint of general aviation (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: An overview of the present situation in the field of aircraft icing with respect to certification and operation of nontransport category airplanes is given. Problems of definition and inconsistencies are pointed out. Problems in the forecasting and measurement of icing intensities are discussed. The present regulatory environment is examined with respect to its applicability and appropriateness to nontransport airplanes.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 31-38
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  • 75
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    Icing of aircraft Some remarks with an historical slant from a cloud physicist (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: Three areas of interest are commented on: cloud physics, nowcasting, and instrumentation. A comparison is made of what was done 30 years ago to what might be done in light of developments in related areas of cloud physics, weather modification and instrumentation.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 17-19
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  • 76
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    The X-ray spectrum of 3C 273 (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 232
    Format: text
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    Interstellar C2 molecules toward Zeta Persei (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A search for absorption by interstellar C2 molecules, conducted at the (2-0) Phillips band near 8760 A, is reported for three stars. No interstellar absorption is seen in the spectra of 20 Tau and Epsilon Aur, at upper limits of approximately 5 mA and 1 mA, respectively. Toward Zeta Per, however, the R(0), Q(2), and Q(4) lines are detected, and a useful upper limit on the Q(6) line is obtained. The resulting column density, 1.4 x 10 to the 13th to 2.0 x 10 to the 13th per sq cm, and the excitation temperature, T = (78 plus or minus 25) K, show acceptable agreement with an existing theoretical model of the absorbing cloud.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 232
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  • 78
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    Galaxies and gamma-ray astronomy (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The nature of the high-energy spectra of several types of active galaxies and their contribution to the measured diffuse gamma-ray emission between 1 and 150 MeV are considered, using X-ray spectra of active galaxies and SAS 2 data regarding the intensity upper limits to the gamma-ray emission above 35 MeV. It is found that a substantial increase in slope of the photon energy spectrum must occur in the low energy gamma-ray region for Seyfert galaxies, BL Lac objects, and emission line galaxies; the power-law spectra observed in the X-ray range must steepen substantially between 50 keV and 50 MeV. In addition, a cosmological integration shows that Seyfert galaxies, BL Lac objects, and quasars may account for most of the 1-150 MeV diffuse background, even without significant evolution.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 232
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    Magnetic Cepheids (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The role of a magnetic field in the pulsational behavior of classical Cepheids has been studied by computing linearized models of pulsating stellar envelopes pervaded by a well-tangled magnetic field. It is found that the 'pulsational' masses of Cepheids that are implied by the theoretical values of the quantities Q(0), P(1)/P(0), and (possibly) P(2)/P(0) can be brought into line with the large 'evolutionary' masses, if the pressure due to the postulated magnetic field is assumed to be comparable to the thermodynamic pressure everywhere in the pulsating layers. The field strengths that are required - several hundred gauss at the surface and several ten thousand gauss at the base - are quite reasonable from the point of view of the observed magnetic fields in Cepheids. The influence of the magnetic field on the location of the blue edge of the instability strip in the H-R diagram is estimated to be very slight.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 234
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  • 80
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    HEAO 1 observations of the X-ray pulsar 4U 1626-67 (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are reported for an observation of the 7-s pulsar 4U 1626-67 with the A-2 experiment on HEAO 1. The phase-averaged X-ray spectrum between 0.7 and 60 keV is complex, as are the constituent spectra, which change radically as a function of pulse phase. Included in this spectral change is the sudden appearance and subsequent decay of a continuum or emission feature with a mean energy of 19 keV, which contains about one-half the power in this spectral range. Pulse-timing results include a new determination of the pulse period and a factor of 8 reduction in the upper limit for the light travel time for orbital periods between 1 and 7 hours. These findings are discussed and compared with the general nature of pulsar spectra.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 231
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  • 81
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    Statistical equilibrium in cometary C2. II - Swan/Phillips band ratios (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Statistical equilibrium calculations have been made for both the triplet and ground state singlets for C2 in comets, using the exchange rate as a free parameter. The predictions of the results are consistent with optical observations and may be tested definitively by accurate observations of the Phillips and Swan band ratios. Comparison with the one reported observation indicates compatibility with a low exchange rate and resonance fluorescence statistical equilibrium.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 231
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  • 82
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    Pioneer 10 studies of interplanetary shocks at large heliocentric distances (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Pioneer 10 Ames plasma analyzer data collected in the 6.1 to 12.6 AU range of heliocentric distances (November 1974 to April 1977) have been examined for interplanetary shock waves. Eighteen shock signatures have been identified, with four of these being of the reverse type and the remainder the forward type. Sonic Mach numbers in the range from 3 to 10 are estimated for these events.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Geophysical Research Letters; 6; June 197
    Format: text
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  • 83
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    Discovery of two distorted interstellar bubbles (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: During an extensive program of direct imagery of emission nebulae, arcuate structures have been found around two stars. A well-defined shocklike structure is found about the T Orionis variable LL Ori, located to the side of the Orion Nebula. A less extensive shocklike structure is also found about the runaway star Zeta Oph. These structures can be best described in terms of distorted interstellar bubbles. A direct consequence of this interpretation is an independent estimate of the rates of mass loss for these stars.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 23
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  • 84
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    An upper limit for the total energy of relativistic particles contained in the early stages of supernova explosions (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A model is proposed for the emission of X-rays from supernova explosions wherein the thermal distribution of photons from a supernova photosphere is inverse Compton scattered by relativistic electrons within or near the surface of the star. Using this model, upper limits for the number of relativistic electrons and their total energy are established on the basis of upper limits to the observed X-ray luminosity of a supernova during maximum light. These upper limits, in conjunction with radio frequency upper limits obtained by Brown and Marscher, strongly suggest that supernovae do not produce significant numbers of relativistic particles until at least 70 years after the initial outburst. This, in turn, implies that young supernovae cannot account for the radio and X-ray variability of active galactic nuclei and quasars.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 230
    Format: text
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  • 85
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    Numerical solution for perpendicular sonic hydrogen injection into a ducted supersonic airstream (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: This note discusses a computer program being developed to study the flow field near opposing perpendicular fuel injectors in scramjets. The MacCormack time-split, finite difference relaxation technique was used to solve the full two-dimensional compressible Navier-Stokes equations along with energy and species equations. By using this technique, a program was developed to consider the turbulent nonreacting flow of hydrogen and air in a rectangular duct. A damping term, proportional to the second derivative of pressure and temperature, was used to produce a stable solution behind the hydrogen jet in the neighborhood of the recompression shock. A case using actual conditions encountered in current scramjet design was analyzed, with results agreeing qualitatively with experimental observations.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; May 1979
    Format: text
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  • 86
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    Gamma rays from accretion onto rotating black holes (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Ionized matter falling onto an isolated rotating black hole will be heated sufficiently that proton-proton collisions will produce mesons, including neutral pions, which decay into gamma rays. For massive (1000-solar mass) black holes, the resulting gamma-ray luminosity may exceed 10 to the 36th erg/s with a spectrum peaked near 20 MeV.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomy and Astrophysics; 74; 1, Ap; Apr. 197
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  • 87
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    Sporadic mass ejection in red supergiants (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A general mechanism first proposed by Burke (1969) is applied to red supergiants for determining the spin-down rate and angular-momentum loss of rotating stars. This model relies principally on sporadic mass ejection, which is assumed to be the result of turbulent elements accelerating material in cool supergiant atmospheres. Mass is preferentially expelled in the forward direction of rotation, resulting in a rapid loss of angular momentum on time scales of 10,000 to 1 million years in the supergiant evolutionary phase. Such rotational breaking will occur if the turbulent elements have characteristic sizes a few percent of the stellar radius and rms velocities one-third the escape speed of the star. This model predicts the formation of a cool silicate disk or torus around the star because of the preferred expulsion of material near equatorial regions of the supergiant.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 228
    Format: text
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  • 88
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    Absorption models for low-frequency variability in compact radio sources (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The consequences of the most plausible version of the absorption model for low-frequency variability in compact extragalactic radio sources are considered. The general restrictions placed on such a model are determined, and observational tests are suggested that can be used either to support the model or to discriminate among its various versions. It is shown that low-frequency variability in compact radio sources can be successfully explained by a class of models in which the flux is modulated by changes in free-free optical depth within an intervening ionized medium. Two versions of such a model are distinguished, one involving large changes in optical depth and the other, small changes. It is noted that while absorption effects are capable of causing rapid flux and structural variations at centimetric wavelengths, the models predict detailed behavior that is in direct conflict with observational data.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 228
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  • 89
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    Comptonization of X-rays by low-temperature electrons (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A method is described for calculating the spectrum that results from the Compton scattering of a monochromatic source of X-rays by low-temperature electrons, both for initial-value relaxation problems and for steady-state spatial diffusion problems. The method gives an exact solution of the inital-value problem for evolution of the spectrum in an infinite homogeneous medium if Klein-Nishina corrections to the Thomson cross section are neglected. This, together with approximate solutions for problems in which Klein-Nishina corrections are significant and/or spatial diffusion occurs, shows spectral structure near the original photon wavelength that may be used to infer physical conditions in cosmic X-ray sources. Explicit results, shown for examples of time relaxation in an infinite medium and spatial diffusion through a uniform sphere, are compared with results obtained by Monte Carlo calculations and by solving the appropriate Fokker-Planck equation.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 228
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  • 90
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    Numerical solution of compressible viscous flows (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The presented review is concerned with the problem of calculating compressible viscous flows. Basic numerical considerations and problems associated with calculating viscous flows are examined and current numerical approaches toward the solution of the Navier-Stokes equations are discussed. It is pointed out that the numerical solution of the full time-dependent equations for turbulent flow is not practical with present computers. Therefore, turbulence effects must be accounted for by modeling. Developments related to turbulence modeling are described. In connection with a discussion of numerical methods for solving viscous flow equations, attention is given to numerical domains of dependence of typical explicit and implicit methods, the diffusion problem, the convection-diffusion problem, and the split-hybrid method.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
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  • 91
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    Photoneutrino reactions in a superstrong magnetoactive plasma (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The neutrino luminosity due to the photoneutrino process in the presence of a superstrong magnetoactive electron plasma appropriate for neutron stars is computed. The results indicate that for relatively low temperatures, between 100 million and 500 million K, the energy loss rate is significantly reduced both in the low-density regime below about 10 million g/cu cm (by the magnetic field) and in the high-density regime above that value (by plasmon excitations). These effects are temperature dependent, and they are less pronounced when the temperature is in the range from 500 million to 1 billion K.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 227
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  • 92
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    Detection of HC/O-18//plus/ in Sagittarius B2 (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Line emission at 85.1 GHz attributed to the J equals 1-0 rotational transition of the formyl ion HC(O-18)(plus) has been detected in Sgr B2 (OH). The double isotopic ratio (O-16/O-18)/(C-12/C-13) in the formyl ion in Sgr B2 is estimated to be in the range 5-10, hence within a factor 2 of the terrestrial value of 5.5. This determination implies that the C-13/C-12 ratio near the galactic center does not differ greatly from that in local molecular clouds.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 227
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  • 93
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    Galactic distribution models of gamma-ray burst sources (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The log N-log S relationships for several galactic distribution models of gamma-ray burst sources are derived. The resulting curves are substantially different from the galactic curves usually assumed (slope = -1). There is a relatively weak dependence on the radial distribution assumed but a strong dependence on scale height. Available observational data from several experiments appear to rule out both thin disk distributions and extended halo distributions which have a strong radial density dependence. The prospects are good for obtaining self-consistent distribution data from future large-area detectors.
    Schlagwort(e): ASTROPHYSICS
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  • 94
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    Scale covariance and G-varying cosmology. II - Thermodynamics, radiation, and the 3 K background (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Within the framework of a scale-covariant theory of gravitation, a semiclassical description of particles and photons is given. Thermodynamic relations consistent with the modified conservation equations are derived. Application to a system of radiation shows that the observed 3-K background radiation can be interpreted, within the present framework, as a remnant of equilibrium radiation in the past. As the theory postulates a nonstandard coupling between gravitation and electrodynamics, the assumption that Einstein's theory of gravitation is unchanged forces modifications at the atomic level. The use of Minkowskian spacetime in atomic physics is found to be adequate only over small, but not large, time scales compared with the age of the universe. As a result, a relation between energy and the frequency of a free photon is demonstrated. Possible observational consequences of this relation are discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal Supplement Series; 41; Oct. 197
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  • 95
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    Large-scale structure of X-ray clusters of galaxies (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Observations from the A-2 experiment on HEAO-1 are used to search for very large-scale structure (exceeding a degree) in 40 X-ray sources in clusters of galaxies. Significant evidence for extension is found only in the relatively nearby Perseus and Virgo clusters. For the remainder of the sources the results place stringent limits on the flux in any very large component.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Royal Astronomical Society; vol. 189
    Format: text
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  • 96
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    The violent interstellar medium (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Observational evidence for high-velocity and high-temperature interstellar gas is reviewed. The physical processes that characterize this gas are described, including the ionization and emissivity of coronal gas, the behavior and appearance of high-velocity shocks, and interfaces between coronal gas and cooler interstellar gas. Hydrodynamical models for the action of supernova explosions and stellar winds on the interstellar medium are examined, and recent attempts to synthesize all the processes considered into a global model for the interstellar medium are discussed.
    Schlagwort(e): ASTROPHYSICS
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  • 97
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    HEAO 1 observations of 4U1232+07 (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: An analysis of the NRL HEAO 1 observations of the Virgo cluster and 3C 273 has revealed X-ray emission from a region between these two objects. The most satisfactory explanation is the presence of two weak X-ray sources, for which error boxes have been obtained. One source is likely to be the peculiar galaxy IC 3576, suggested by Margon et al. (1972) as the source 2U 1231+07=4U 1232+07. The error box resulting from combining the present observations with the 4U data strengthen the X-ray identification with this extremely interesting galaxy. There are numerous possibilities for the other X-ray source, including the interacting pair of galaxies NGC 4410a and NGC 4410b (NGC 4410a/b).
    Schlagwort(e): ASTROPHYSICS
    Materialart: Nature; 281; Oct. 11
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  • 98
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    VV 5-32-63/64 - The 'supermassive double galaxy' in Abell 1775 revisited (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectroscopy is presented for galaxies in A 1775, the cluster containing VV 5-32-63/64, an apparent double galaxy which has long been considered a gravitationally bound system with supermassive components (10 to the 13th solar masses). However, this model has run afoul of recent radio observations, which detected an extremely long straight radio tail emanating from the eastern galaxy in the pair. The present observations indicate that if both galaxies are members of the same cluster, the cluster radial-velocity dispersion (1522 km/sec) is large enough to account for the velocity difference between the two VV galaxies (1650 km/sec). It is therefore suggested that the VV galaxies are not gravitationally bound and need not be supermassive. The large velocity dispersion measured for A 1775 also strains suggested velocity dispersion vs X-ray luminosity relations for clusters of galaxies, as A 1775 has not yet been detected at X-ray wavelengths.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomical Society of the Pacific; vol. 91
    Format: text
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  • 99
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    Infrared spectroscopy of stars (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: This paper reviews applications of IR techniques in stellar classification, studies of stellar photospheres, elemental and isotopic abundances, and the nature of remnant and ejected matter in near-circumstellar regions. Qualitative IR spectral classification of cool and hot stars is discussed, along with IR spectra of peculiar composite star systems and of obscured stars, and IR characteristics of stellar populations. The use of IR spectroscopy in theoretical modeling of stellar atmospheres is examined, IR indicators of stellar atmospheric composition are described, and contributions of IR spectroscopy to the study of stellar recycling of interstellar matter are summarized. The future of IR astronomy is also considered.
    Schlagwort(e): ASTROPHYSICS
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    Observed properties of interstellar dust (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Recent information on the observed properties of interstellar dust is reviewed, with an attempt made to clarify some of the observational uncertainties associated with obtaining dust parameters. Attention is given to interstellar extinction, the interstellar dust distribution, the dust-to-gas ratio, and light scattering by dust grains. Interstellar polarization is also examined, along with heavy-element depletion in the interstellar medium, thermal emission from interstellar dust grains, diffuse interstellar features, and the composition and origin of interstellar grains.
    Schlagwort(e): ASTROPHYSICS
    Format: text
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