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  • 1
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    In:  Geophys. J. Int., Warszawa, Elsevier, vol. 118, no. 1-2, pp. 693-706, pp. 1960, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Location ; Seismology ; Hypocentral depth ; Data analysis / ~ processing ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Unbekannt
    In:  Terra Nova, Potsdam, ZIPE, vol. 6, no. 6979, pp. 291-300, pp. 2501, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Earthquake ; Tectonics
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Unbekannt
    In:  Geologie en Mijnbouw, Potsdam, ZIPE, vol. 73, no. 6979, pp. 181-197, pp. 2501, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Earthquake ; Source parameters ; Magnitude ; Seismology ; Fault plane solution, focal mechanism ; Location ; Tectonics
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Unbekannt
    In:  Phys. Earth Plan. Int., Warszawa, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 85, no. 1-3, pp. 293-318, pp. B05310, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Source ; SH waves ; Earthquake ; Inversion ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Unbekannt
    In:  Phys. Earth Plan. Int., Bonn, Pergamon, vol. 82, no. 4, pp. 271-276, pp. 2018, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1994
    Schlagwort(e): Quality factor ; FractureT ; Attenuation ; Seismology ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Berlin, Schweizerbart'sche Verlagsbuchhandlung, vol. 75, no. 48, pp. 563, pp. L07302, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): CMB ; Geothermics ; earth Core ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Unbekannt
    In:  J. Geophys. Res., London, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 99, no. 1, pp. 11859-11877, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): Volcanology ; Non-linear effects ; Fluids ; Dynamic ; Seismology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Unbekannt
    In:  Geophys. J. Int., London, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 117, no. 4, pp. 345-364, pp. B02206, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): Stress ; Seismicity ; Modelling ; Seismology ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Unbekannt
    In:  Ann. Rev. Earth Planet. Sci., Amsterdam, Elsevier Scientific Publishing Company, vol. 22, no. 50, pp. 207-237, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): Review article ; Seismology ; Source ; ANREV
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Unbekannt
    In:  Geophys. Res. Lett., Luxembourg, Conseil de l'Europe, vol. 21, no. 1, pp. 9-12, pp. L24312, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Moment tensor ; Fault plane solution, focal mechanism ; Seismology ; Wave form analysis ; Inversion ; GRL ; 7215 ; Seismology ; Earthquake ; parameters ; 7255 ; Surface ; waves ; and ; free ; oscillations ; nokms
    Standort Signatur Erwartet Verfügbarkeit
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  • 11
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    Unbekannt
    In:  Geophys. Res. Lett., Basel, Elsevier Science Publishers, vol. 21(14), no. B3, pp. 1491-1494, pp. B03304, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; China ; GRL
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
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    Unbekannt
    In:  J. Volc. Geoth. Res., Basel, Elsevier Science Publishers, vol. 62, no. B11, pp. 137-151, pp. 2519, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Volcanology ; Location ; Fluids
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
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    Unbekannt
    In:  Bull. Seism. Soc. Am., Chengdu, Sichuan, China, 4, vol. 84(2), no. B3, pp. 307-323, pp. 1334, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
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    Unbekannt
    In:  J. Geophys. Res., New York, 1-2, vol. 99, no. 19, pp. 2591-2600, pp. 2554, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Waves ; Wave propagation ; Non-linear effects ; Seismology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
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    Unbekannt
    In:  J. Geophys. Res., New York, August, vol. 99/B7, no. 3, pp. 13655-13665, pp. B05S05, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; China ; Seismology ; earth mantle ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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  • 16
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    Unbekannt
    In:  Tectonophys., Kalamazoo, Michigan 49001, The Upjohn Company, vol. 233, no. 4, pp. 253-264, pp. L09603, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Location ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
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    Unbekannt
    In:  Seismological Res. Lett., L'wiw, Inst. f. Theoret. Geodäsie, vol. 65 (1), no. 4, pp. 20, pp. B01408, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; Conference abstr. ; SRL
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
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    Unbekannt
    In:  Phys. Earth Plan. Int., Luxembourg, Conseil de l'Europe, vol. 83, no. 5, pp. 41-56, pp. L20305, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Source parameters ; Low frequency ... ; Data analysis / ~ processing ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
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    Unbekannt
    In:  Geophys. J. Int., Stuttgart, Schweizerbart'sche Verlagsbuchhandlung, vol. 118, no. 11/12, pp. 802-807, pp. L08309, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): Inhomogeneity ; Seismology ; Travel time ; Vertical seismic profiling ; Borehole geophys. ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
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    Unbekannt
    In:  Geophys. J. Int., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 117, no. 44, pp. 591-609, pp. L12S09, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; RMS ; Lg-waves ; Nuclear explosion ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 21
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    Unbekannt
    In:  J. Geophys. Res., Chengdu, Sichuan, China, 4, vol. 99, no. B3, pp. 11705-11722, pp. 1334, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Fault zone ; Seismology ; Waves ; Channel waves ; Earthquake ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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  • 22
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    Unbekannt
    In:  Geophys. J. Int., Hannover, Conseil de l'Europe, vol. 119, no. 1, pp. 783-790, pp. L24314, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Anisotropy ; Seismology ; Stefansson ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 23
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Paris, Conseil de l'Europe, vol. 75, no. 13, pp. 150f., 154, pp. L01306, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Project report/description ; OBS ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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  • 24
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    Unbekannt
    In:  Tectonophys., Washington, D.C., American Geophysical Union, vol. 231, no. 3, pp. 311-323, pp. L08304, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Fault plane solution, focal mechanism ; Seismology ; Earthquake catalog
    Standort Signatur Erwartet Verfügbarkeit
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  • 25
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    Unbekannt
    In:  DGG Mittlg., L'wiw, 3-4, vol. 211, no. 4, pp. 53-54, pp. L24312, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Proceedings of a conference ; Geodesy ; Gravimetry, Gravitation ; Seismology ; Earthquake precursor: prediction research ; Kumpel
    Standort Signatur Erwartet Verfügbarkeit
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  • 26
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    Unbekannt
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 99, no. 1, pp. 15457-15467, pp. L24312, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Moment tensor ; Seismology ; Source mechanics ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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  • 27
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    Unbekannt
    In:  GSA Today, Tulsa, 450 pp.; 2nd modified and expanded ed., Society of Exploration Geophysics, vol. 4, no. 5, pp. 129, 132-134, pp. B12408, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Real time earthquake monitoring ; Seismology ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Fracture
    Standort Signatur Erwartet Verfügbarkeit
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  • 28
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    Unbekannt
    In:  Rev. Geophys., Paris, Conseil de l'Europe, vol. 32, no. 1-2, pp. 115-137, pp. L01306, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; ConvolutionE ; GeodesyY ; Tomography ; Review article
    Standort Signatur Erwartet Verfügbarkeit
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  • 29
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    Unbekannt
    In:  Bull. Seism. Soc. Am., vol. 84, no. 3-4, pp. 724-734
    Publikationsdatum: 1994
    Schlagwort(e): Local earthquakes ; Source ; Seismology ; Earthquake ; Source parameters ; multiple ; ruptures ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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  • 30
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    Unbekannt
    In:  Geologie en Mijnbouw, Bonn, Inst. f. Theoret. Geodäsie, vol. 73, no. 2, pp. 199-214
    Publikationsdatum: 1994
    Schlagwort(e): Fault plane solution, focal mechanism ; Source parameters ; Earthquake ; Aftershocks ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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  • 31
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    Unbekannt
    In:  Geophys. J. Int., Luxembourg, Conseil de l'Europe, vol. 119, no. 2, pp. 574-594, pp. 1892
    Publikationsdatum: 1994
    Schlagwort(e): Velocity depth profile ; Teleseismic events ; Seismology ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 32
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., San Francisco, Pergamon, vol. 75, no. 20, pp. 225, pp. 1246
    Publikationsdatum: 1994
    Schlagwort(e): SEDI ; Seismic networks ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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  • 33
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    Unbekannt
    In:  Geophys. J. Int., Warszawa, Elsevier, vol. 118, no. 1-2, pp. 680-692, pp. 1960, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Location ; Seismology ; Data analysis / ~ processing ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 34
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    Unbekannt
    In:  Geophys. J. Int., Leipzig, 3-4, vol. 116, no. 1, pp. 663-672, pp. L19606, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Source parameters ; Seismology ; Earthquake ; Inversion ; Surface waves ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 35
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    Unbekannt
    In:  Earth planet. Sci. Lett., Potsdam, ZIPE, vol. 121, no. 4, pp. 385-403, pp. 2156, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Geothermics ; earth mantle ; Tomography ; Seismology ; Mineralogy ; Modelling ; Cadek
    Standort Signatur Erwartet Verfügbarkeit
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  • 36
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    Unbekannt
    In:  DGG Mittlg., Warszawa, Conseil de l'Europe, vol. 5, no. 1-2, pp. 10-19, pp. 1095, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Project report/description ; Stress ; Geothermics ; Seismology ; Laboratory measurements ; Cermak
    Standort Signatur Erwartet Verfügbarkeit
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  • 37
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    Unbekannt
    In:  Annali di Geofisica, Roma, Publicazioni dell'Istituto Nazionale di Geofisica, vol. 37, no. 3, pp. V, pp. B09304, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Proceedings of a conference ; Nuclear explosion ; Seismology ; Data analysis / ~ processing ; Detectors ; Discrimination ; Magnitude ; Location
    Standort Signatur Erwartet Verfügbarkeit
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  • 38
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    Unbekannt
    In:  J. Volc. Geoth. Res., Roma, Publicazioni dell'Istituto Nazionale di Geofisica, vol. 62, no. 2, pp. 467-496, pp. B04102, (ISBN: 0-12-018847-3)
    Publikationsdatum: 1994
    Schlagwort(e): Earthquake precursor: prediction research ; Volcanology ; Seismology ; Earthquake precursor: statistical anal. of seismicity
    Standort Signatur Erwartet Verfügbarkeit
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  • 39
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    Unbekannt
    In:  Geologie en Mijnbouw, Stockholm, Wissenschaftliche Buchgesellschaft, vol. 4, no. E53, pp. 1-4, pp. L11308, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Stress ; Fault plane solution, focal mechanism ; Seismology ; rifting ; Conference abstr.
    Standort Signatur Erwartet Verfügbarkeit
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  • 40
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    In:  Tectonophys., Oslo, Wiley, vol. 237, no. 35, pp. 73-86, pp. B08303, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Fault plane solution, focal mechanism ; Seismology ; Rognvaldsson
    Standort Signatur Erwartet Verfügbarkeit
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  • 41
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    Unbekannt
    In:  Phys. Earth Plan. Int., Oslo, Wiley, vol. 84, no. 23, pp. 179-192, pp. L02304, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Inelastic ; Low frequency ... ; Surface waves ; Attenuation ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 42
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    Unbekannt
    In:  Science, Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 263, no. 1-2, pp. 1105-1111, pp. 1019, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Plate tectonics ; ConvolutionE ; Anisotropy ; Seismology ; earth mantle
    Standort Signatur Erwartet Verfügbarkeit
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  • 43
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    Unbekannt
    In:  Geophys. J. Int., Hokkaido University, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 117, no. 1-4, pp. 487-494, pp. 8038, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Scattering ; Seismology ; ConvolutionR ; Body waves ; Coda (waves, ~ of seismograms) ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 44
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    Unbekannt
    In:  J. Volc. Geoth. Res., Hokkaido University, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 63, no. 105, pp. 111-128, pp. 2339, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Volcanology ; Seismology ; Seismicity
    Standort Signatur Erwartet Verfügbarkeit
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  • 45
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    Unbekannt
    In:  Natural Hazards, Stuttgart, Ferdinand Enke Verlag, vol. 10, no. 2, pp. 275-296, pp. L07611, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Site amplification ; Earthquake engineering, engineering seismology ; Seismology ; Modelling ; Statistical investigations ; NATHAZ ; SRICHWALSKI
    Standort Signatur Erwartet Verfügbarkeit
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  • 46
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    Unbekannt
    In:  Geophysical Journal International, Stuttgart, Ferdinand Enke Verlag, vol. 119, no. 2, pp. 31-43, pp. L07611, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Earthquake ; Modelling ; Statistical investigations ; High frequency ... ; Strong motions ; Seismology ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 47
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    Unbekannt
    In:  Phys. Earth Plan. Int., Luxembourg, Deutsche Geophys. Gesellschaft, vol. 85, no. B11, pp. 265-272, pp. B11307, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Stress drop ; Seismology ; PEPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 48
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Luxembourg, Inst. Electrical & Electronics Engineers, vol. 75, no. 39, pp. 449, pp. B06303, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Surface waves ; Review article
    Standort Signatur Erwartet Verfügbarkeit
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  • 49
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    Unbekannt
    In:  J. Volc. Geoth. Res., Würzburg, Pergamon, vol. 62, no. 49, pp. 153-182, pp. B05S01, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Volcanology
    Standort Signatur Erwartet Verfügbarkeit
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  • 50
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    In:  Eos, Trans., Am. Geophys. Un., Berlin, Pergamon, vol. 75, no. 10, pp. 117, pp. B04306, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Attenuation
    Standort Signatur Erwartet Verfügbarkeit
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  • 51
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    In:  Geophys. Res. Letters, Veldhoven, Kluwer, vol. 21, no. 6, pp. 457-460, pp. 2141, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; earth mantle ; Seismology ; Seismic networks ; GRL
    Standort Signatur Erwartet Verfügbarkeit
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  • 52
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    In:  Eos, Trans., Am. Geophys. Un., Leipzig, Akad. Nauk SSSR, vol. 75, no. 28, pp. 313, pp. B01308, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Nuclear explosion ; CTBT ; Seismology ; Detectors
    Standort Signatur Erwartet Verfügbarkeit
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  • 53
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    In:  Bull. Seism. Res., Kunming, China, D. Reidel Publishing Company, vol. 17, no. B11, pp. 30-39, pp. L09303, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Seismicity ; Earthquake precursor: statistical anal. of seismicity
    Standort Signatur Erwartet Verfügbarkeit
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  • 54
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    American Geophysical Union
    In:  London, American Geophysical Union, vol. 1, no. 3, pp. 632 pp., (ISBN-10: 1-84628-053-2, ISBN-13:978-1-84628-053-5, eISBN 1-84628-054-0, xx + 591 pp. + CD-ROM)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; GeodesyY ; Synthetic seismograms
    Standort Signatur Erwartet Verfügbarkeit
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  • 55
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    Unbekannt
    In:  Bull. Seism. Soc. Am., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 84, no. 2, pp. 359-365, pp. L09611
    Publikationsdatum: 1994
    Beschreibung: A prototype early warning system to provide San Francisco and Oakland, California a few tens-of-seconds warning of incoming strong ground shaking from already-occurred M = or 〉 3.7 aftershocks of the magnitude 7.1 17 October 1989 Loma Prieta earthquake was operational on 28 October 1989. The prototype system consisted of ground motion sensors in the epicentral area, a central receiver, a radio repeater, and radio receivers. One of the radio receivers provided about 20 sec of warning before shaking from the M 4.5 Loma Prieta aftershock that occurred on 2 November 1989 at 0550 UTC. In its first 6 months of operation, the system generated triggers for all 12 M 〉 3.7 aftershocks for which trigger documentation is preserved. Because the prototype system demonstrated that potentially useful warnings of strong shaking from aftershocks are feasible, the USGS has completed a portable early warning system for aftershocks that can be deployed anywhere. One of the radio receivers was deployed at the California Department of Transportation (CALTransformations) headquarters at the damaged Cypress Street section of the I-880 freeway in Oakland, California on 28 October 1989 and provided about 20 sec ..., did not trigger on any M〈or=3.6 aftershocks, and produced one false trigger as a result of a now-corrected single point of failure design flaw.
    Schlagwort(e): Seismology ; Early warning systems (earthquakes, volcanic eruptions, tsunamis etc.) ; Aftershocks ; Detectors ; Location ; Magnitude ; Instruments ; Source parameters ; Strong motions ; Seismometer ; BSSA ; San ; Francisco ; Oakland ; California ; Loma ; Prieta ; ground ; motion ; sensors ; epicentral ; area ; central ; receiver ; radio ; repeater ; radio ; receivers ; California ; Department ; of ; Transportation ; headquarters ; CALTransformations ; I-880 ; freeway ; triggers ; prototype ; system ; USA
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  • 56
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    In:  J. Volc. Geoth. Res., Luxembourg, Am. Soc. Mech. Eng., vol. 61, no. 8, pp. 239-251, pp. L12311, (ISBN 0-471-26610-8)
    Publikationsdatum: 1994
    Schlagwort(e): Seismicity ; Volcanology ; Seismology ; Waves
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  • 57
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    Unbekannt
    In:  Pageoph, Luxembourg, Am. Soc. Mech. Eng., vol. 143, no. 1-2, pp. 513-536, pp. 2099, (ISBN 0-471-26610-8)
    Publikationsdatum: 1994
    Schlagwort(e): Wave propagation ; Synthetic seismograms ; Modelling ; Site amplification ; Seismology ; Fah ; Faeh
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  • 58
    facet.materialart.
    Unbekannt
    In:  Bull. Seism. Soc. Am., Luxembourg, Am. Soc. Mech. Eng., vol. 84, no. 1-2, pp. 383-399, pp. 2099, (ISBN 0-471-26610-8)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Strong motions ; Site amplification ; Modelling ; Synthetic seismograms ; combination ; BSSA ; Fah ; Faeh ; Zahradnik
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  • 59
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    Unbekannt
    In:  Bull. Seism. Soc. Am., Heidelberg, 1, vol. 84, no. 4-5, pp. 646-659, pp. B01401, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1994
    Schlagwort(e): Source ; Seismology ; Earthquake ; Global Positioning System ; southern ; California ; BSSA
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  • 60
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    In:  Science, Klagenfurt, Nuclear Technology Publ., vol. 264, no. 2, pp. 804-809, pp. L14312, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Source ; Fault plane solution, focal mechanism ; CLVD ; nokms
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  • 61
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    In:  J. Geophys. Res., Bonn, Pergamon, vol. 99, no. 4, pp. 11723-11730, pp. 2018, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1994
    Schlagwort(e): Nuclear explosion ; DeconvolutionP ; Magnitude ; Energy (of earthquakes) ; Source ; Seismology ; Detectors ; JGR
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  • 62
    facet.materialart.
    Unbekannt
    In:  J. Geophys. Res., Luxembourg, Am. Soc. Mech. Eng., vol. 99, no. 6, pp. 11643-11662, pp. L12311, (ISBN 0-471-26610-8)
    Publikationsdatum: 1994
    Schlagwort(e): Body waves ; Surface waves ; Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity ; Seismology ; Waves ; JGR ; Earthquake
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  • 63
    facet.materialart.
    Unbekannt
    In:  Earth planet. Sci. Lett., Kleinmachnow, Dt. Geophys. Ges. e. V., vol. 122, no. 6, pp. 89-101, pp. B05401, (ISBN: 0534351875, 2nd edition)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Earth model, also for more shallow analyses ! ; Subduction zone ; phase ; transition
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  • 64
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    Unbekannt
    In:  Geophys. J. Int., Kyoto, AGU, vol. 116, no. 1, pp. 673-682, pp. L07305, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Source parameters ; Seismology ; Earthquake ; Spectrum ; Body waves ; Seismic networks ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 65
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    Unbekannt
    In:  Bull. Seism. Soc. Am., Basle, Wiley, vol. 84, no. 1, pp. 1169-1183, pp. 1264, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Three dimensional ; Scattering ; Seismology ; Two-dimensional ; BSSA ; Sanchez
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  • 66
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    Unbekannt
    In:  Geophys. Res. Lett., Luxembourg, Conseil de l'Europe, vol. 21(14), no. 28, pp. 1507-1510, pp. 2131, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Review article ; plume ; Seismology ; earth mantle ; Volcanology ; ConvolutionE ; GRL
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  • 67
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    In:  Phys. Earth Plan. Int., Minsk, Polish Geothermal Association, vol. 82, no. 7, pp. 1-7, pp. L24309, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Seismicity ; Moment tensor ; Filter- ; PEPI
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  • 68
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    Unbekannt
    In:  Geophys. J. Int., Dordrecht, National Academy of Sciences of the USA, vol. 119, no. 5-6, pp. 949-963, pp. TC5003, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; Shear waves ; GJI
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  • 69
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    In:  J. Geophys. Int., Stockholm, Wissenschaftliche Buchgesellschaft, vol. 119, no. E53, pp. 402-420, pp. L11308, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; earth mantle ; rifting
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  • 70
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    Unbekannt
    In:  Geophys. J. Int., Luxembourg, National Academy of Sciences of the USA, vol. 119, no. 2, pp. 260-268, pp. B05311, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Earthquake ; Source ; Aftershocks ; GJI
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  • 71
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    Unbekannt
    In:  Phys. Earth Plan. Int., Luxembourg, Lawrence Livermore National Laboratory, vol. 86, no. 1-2, pp. 5-24, pp. B05311, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; GeodesyY ; GeodesyY ; PEPI
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  • 72
    facet.materialart.
    Unbekannt
    In:  Bull. Seism. Res., Washington, D.C., AGU, vol. 17, no. 1-4, pp. 46-55, pp. B05204, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): China ; Earthquake ; Seismology ; Crustal deformation (cf. Earthquake precursor: deformation or strain)
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  • 73
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    In:  Geophys. J. Int., Taipei, AGU, vol. 118, no. 6, pp. 57-74, pp. B05403, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Travel time ; Amplitude ; Seismology ; Seismic arrays ; GJI
    Standort Signatur Erwartet Verfügbarkeit
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  • 74
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    Unbekannt
    In:  J. Phys. Earth, Reykjavík, Icelandic Meteorological Office, Ministry for the Environment, University of Iceland, vol. 42, no. 5694, pp. 425-437, pp. 2212, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Fracture ; Elasticity ; Seismology ; Elasticity theory of dislocations ; JPE
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  • 75
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Hannover, Polish Geothermal Association, vol. 75, no. 22, pp. 249, pp. 1051, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Earthquake precursor: prediction research ; Review article ; ENDNOTE?
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  • 76
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    In:  Geophys. J. Int., Washington, D.C., AGU, vol. 118, no. 11, pp. 20-30, pp. 1047, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Source ; Seismology ; Fault plane solution, focal mechanism ; Moment tensor ; GJI
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  • 77
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Leyden, Noordhoff International Publishing, vol. 75, no. 24, pp. 265, pp. B04306, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Nuclear explosion ; CTBT ; Seismology ; Detectors
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  • 78
    facet.materialart.
    Unbekannt
    In:  Bull. Seism. Soc. Am., Hannover, D. Reidel Publishing Company, vol. 84, no. 4, pp. 974-1002, pp. L09303, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; scaling ; Source parameters ; Magnitude ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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  • 79
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    Unbekannt
    In:  Bull. Seism. Soc. Am., Kunming, China, 3-4, vol. 84, no. 3, pp. 91-104, pp. B05301, (ISSN: 1340-4202)
    Publikationsdatum: 1994
    Schlagwort(e): Seismology ; Source parameters ; Location ; Broad-band ; Inversion ; BSSA
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  • 80
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    Blackwell Scientific Publications
    In:  736 pp., Blackwell Scientific Publications, vol. 5, no. XVI:, pp. 227-235, (ISBN 0632036990)
    Publikationsdatum: 1994
    Schlagwort(e): Handbook of geophysics ; Handbook of geology ; Seismics (controlled source seismology) ; Plate tectonics ; Seismology ; Gravimetry, Gravitation
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  • 81
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    Inst. f. Meteorol. und Geophys., Univ. Frankfurt am Main, 124 pp.
    In:  Diploma Thesis, Calgary, Inst. f. Meteorol. und Geophys., Univ. Frankfurt am Main, 124 pp., vol. C 560, 183 pp., no. 78-694, pp. 1-113, (ISBN 3-933346-037)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; Seismic networks
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  • 82
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    Unbekannt
    In:  Eos, Trans., Am. Geophys. Un., Luxembourg, Conseil de l'Europe, vol. 75, no. 28, pp. 313, pp. 1484, (ISSN 0343-5164)
    Publikationsdatum: 1994
    Schlagwort(e): Volcanology ; Seismology ; Bruestle ; Brustle
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  • 83
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    Unbekannt
    In:  Geophys. J. Int., Luxembourg, Conseil de l'Europe, vol. 119, no. 6, pp. 561-573, pp. 1484, (ISSN 0343-5164)
    Publikationsdatum: 1994
    Schlagwort(e): AnisotropyS ; Seismology ; Shear waves ; GJI
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  • 84
    Publikationsdatum: 2011-08-24
    Beschreibung: 3C-SiC (beta-SiC) and 6H-SiC p-n junction diodes have been fabricated in regions of both 3C-SiC and 6H-SiC epitaxial layers which were grown side-by-side on low-tilt-angle 6H-SiC substrates via a chemical vapor deposition (CVD) process. Several runs of diodes exhibiting state-of-the-art electrical characteristics were produced, and performance characteristics were measured and compared as a function of doping, temperature, and polytype. The first 3C-SiC diodes which rectify to reverse voltages in excess of 300 V were characterized, representing a six-fold blocking voltage improvement over experimental 3C-SiC diodes produced by previous techniques. When placed under sufficient forward bias, the 3C-SiC diodes emit significantly bright green-yellow light while the 6H-SiC diodes emit in the blue-violet. The 6H-SiC p-n junction diodes represent the first reported high-quality 6H-SiC devices to be grown by CVD on very low-tilt-angle (less than 0.5 deg off the (0001) silicon face) 6H substrates. The reverse leakage current of a 200 micron diameter circular device at 1100 V reverse bias was less than 20 nA at room temperature, and excellent rectification characteristics were demonstrated at the peak characterization temperature of 400 C.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Electron Devices (ISSN 0018-9383); 41; 5; p. 826-835
    Format: text
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  • 85
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: An important aspect of an ASIC (Application Specific Integrated Circuit) design process is verification. The design must not only be functionally accurate, but it must also maintain the correct timing. After a circuit has been laid out, one can utilize the Back Annotation (BA) method to simulate the design and obtain an accurate estimate of performance. However, this can lead to major design changes. It is therefore preferable to eliminate potential problems early in this process. IFA, the Intelligent Front Annotation program, assists in verifying the timing of the ASIC early in the design process. Many difficulties can arise during ASIC design. In a synchronous design, both long path and short path problems can be present. In modern ASIC technologies, the delay through a gate is very dependent on loading. This loading has two main components, the capacitance of the gates being driven and the capacitance of the metal tracks (wires). When using GaAs gate arrays, the metal line capacitance is often the dominating factor. Additionally, the RC delay through the wire itself is significant in sub-micron technologies. Since the wire lengths are unknown before place and route of the entire chip, this would seem to postpone any realistic timing verification until towards the end of the design process, obviously an undesirable situation. The IFA program estimates the delays in an ASIC before layout. Currently the program is designed for Vitesse GaAs gate arrays and, for input, requires the expansion file which is output by the program GED; however, the algorithm is appropriate for many different ASIC types and CAE platforms. IFA is especially useful for devices whose delay is extremely dependent on the interconnection wiring. It estimates the length of the interconnects using information supplied by the user and information in the netlist. The resulting wire lengths are also used to constrain the Place and Route program, ensuring reasonable results. IFA takes locality into account to give a better estimate of wire length, as well as known factors such as fanout and drive. Although the exact location of a cell is not known, an estimate of the wire length can be calculated from the location of the net in the ASIC design structure hierarchy. The length of each net is estimated using the IFA program. This length is then used to run timing analysis or simulation on the design using IFA estimated delay values and to define constraints for Place and Route. Place and Route will use the constraints as limiting values, along with the floor-plan information, to assist the placement. The IFA program has been successfully used in the design of three 350K gate GaAs chips. IFA is written in C language for Sun series computers running SunOS. It is designed to accept input files which are generated by the program GED (CADENCE Design Systems, Inc.; San Jose, CA; 408-943-1234). Sample executables for Sun4 series computers are provided with the distribution medium. IFA requires 32M of RAM for execution. The standard distribution medium is a .25 inch streaming magnetic tape cartridge in UNIX tar format. Documentation is included in the price of the program. IFA was developed in 1992 and is a copyrighted work with all copyright vested in NASA.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-19025
    Format: text
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  • 86
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: A computerized interactive harness engineering program has been developed to provide an inexpensive, interactive system which is designed for learning and using an engineering approach to interconnection systems. PCACE is basically a database system that stores information as files of individual connectors and handles wiring information in circuit groups stored as records. This directly emulates the typical manual engineering methods of data handling, thus making the user interface to the program very natural. Data files can be created, viewed, manipulated, or printed in real time. The printed ouput is in a form ready for use by fabrication and engineering personnel. PCACE also contains a wide variety of error-checking routines including connector contact checks during hardcopy generation. The user may edit existing harness data files or create new files. In creating a new file, the user is given the opportunity to insert all the connector and harness boiler plate data which would be part of a normal connector wiring diagram. This data includes the following: 1) connector reference designator, 2) connector part number, 3) backshell part number, 4) cable reference designator, 5) cable part number, 6) drawing revision, 7) relevant notes, 8) standard wire gauge, and 9) maximum circuit count. Any item except the maximum circuit count may be left blank, and any item may be changed at a later time. Once a file is created and organized, the user is directed to the main menu and has access to the file boiler plate, the circuit wiring records, and the wiring records index list. The organization of a file is such that record zero contains the connector/cable boiler plate, and all other records contain circuit wiring data. Each wiring record will handle a circuit with as many as nine wires in the interface. The record stores the circuit name and wire count and the following data for each wire: 1) wire identifier, 2) contact, 3) splice, 4) wire gauge if different from standard, 5) wire/group type, 6) wire destination, and 7) note number. The PCACE record structure allows for a wide variety of wiring forms using splices and shields, yet retains sufficient structure to maintain ease of use. PCACE is written in TURBO Pascal 3.0 and has been implemented on IBM PC, XT, and AT systems under DOS 3.1 with a memory of 512K of 8 bit bytes, two floppy disk drives, an RGB monitor, and a printer with ASCII control characters. PCACE was originally developed in 1983, and the IBM version was released in 1986.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-17006
    Format: text
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  • 87
    Publikationsdatum: 2011-08-24
    Beschreibung: The LOOP computer program was written to simulate the Automatic Frequency Control (AFC) subsystem of a Differential Minimum Shift Keying (DMSK) receiver with a bit rate of 2400 baud. The AFC simulated by LOOP is a first order loop configuration with a first order R-C filter. NASA has been investigating the concept of mobile communications based on low-cost, low-power terminals linked via geostationary satellites. Studies have indicated that low bit rate transmission is suitable for this application, particularly from the frequency and power conservation point of view. A bit rate of 2400 BPS is attractive due to its applicability to the linear predictive coding of speech. Input to LOOP includes the following: 1) the initial frequency error; 2) the double-sided loop noise bandwidth; 3) the filter time constants; 4) the amount of intersymbol interference; and 5) the bit energy to noise spectral density. LOOP output includes: 1) the bit number and the frequency error of that bit; 2) the computed mean of the frequency error; and 3) the standard deviation of the frequency error. LOOP is written in MS SuperSoft FORTRAN 77 for interactive execution and has been implemented on an IBM PC operating under PC DOS with a memory requirement of approximately 40K of 8 bit bytes. This program was developed in 1986.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-16800
    Format: text
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  • 88
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: Accurate computer modeling of passive circular or rectangular waveguide components is often required during the design phase for optimizing frequency response and/or determining the tolerance required on components in order to meet radio frequency specifications. RWGSCAT/CWGSCAT is capable of modeling both types of waveguide components. The Scattering Matrix Program for Circular Waveguide Junctions, CWGSCAT, computes the scattering matrix for a circular waveguide. This includes a dual mode horn and certain types of corrugated horns. RWGSCAT, Rectangular WaveGuide junction SCATtering program, solves for the scattering properties of a rectangular waveguide device, such as a smooth or corrugated rectangular horn, step transformer, or filter. RWGSCAT and CWGSCAT are also available separately as NPO-19091 and NPO-18708, respectively. Many circular waveguide devices can be represented either exactly or approximately as a series of circular waveguide sections which have a common center. In addition, smooth tapers and horns of arbitrary profile may be approximated by a series of small steps. Devices that may be analyzed in this fashion include a simple waveguide step discontinuity, such as that used in a dual mode horn, a stepped matching section, or a corrugated waveguide section with constant varying slot depth. CWGSCAT will accurately predict the reflection and transmission characteristics of such devices, taking into account higher order mode excitation if it occurs as well as multiple reflections and stored energy at each discontinuity. For large devices, with respect to a wavelength where many modes may propagate, the reflection and transmission properties may be required for a higher order mode or series of modes exciting the device. Such interactions are represented best by defining a scattering matrix for the device. The matrix can be determined by using mode matching at each discontinuity present. The results for individual discontinuities are then cascaded to get the matrix for the entire device. Frequently, rectangular waveguide components may be represented either exactly or approximately as a number of different size rectangular waveguides which are connected in series. RWGSCAT will model such devices and accurately predict the reflection and transmission characteristics, taking into account higher order (other than dominant TE 10) mode excitation if it occurs, as well as multiple reflections and stored energy at each discontinuity. For devices which are large with respect to the wavelength of operation, the characteristics of the device may be required for computing a higher order mode or a number of higher order modes exciting the device. Such interactions can be represented by defining a scattering matrix for each discontinuity in the device, and then cascading the individual scattering matrices in order to determine the scattering matrix for the overall device. The individual matrices are obtained using the mode matching method. RWGSCAT and CWGSCAT are written in FORTRAN 77 for IBM PC series and compatible computers running MS-DOS. They have been successfully compiled and implemented using Lahey FORTRAN 77 under MS-DOS. Sample MS-DOS executables and sample input data files are provided on the distribution media. RWGSCAT requires 377K of RAM for execution. CWGSCAT requires 355K of RAM for execution. The standard distribution medium for this program is a set of two 5.25 inch 360K MS-DOS format diskettes. The contents of the diskettes are compressed using the PKWARE archiving tools. The utility to unarchive the files, PKUNZIP.EXE, is included. An electronic copy of the documentation is included on the distribution medium in LaTEX format. RWGSCAT was developed in 1993. CWGSCAT was developed in 1987, and this version was released in 1991. RWGSCAT and CWGSCAT are copyrighted works with all copyrights vested in NASA.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: COS-10045
    Format: text
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  • 89
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: Resistivity of a Thin Film Deposited on a Conductive Substrate is a computer program developed to aid in the solution of the class of problems where resistivity measurements are needed for a substance deposited on a substrate of higher resistivity than the deposited layer. One of the ways in which a semiconductor material is characterized is by measurement of its resistivity. In the development of silicon carbide (SiC) for use as a semiconductor material for high temperature applications, it became necessary to measure the resistivity of the thin SiC film while it was still attached to the silicon upon which it had been grown epitaxially. The problem is that the presence of the silicon substrate will introduce error in the measured resistivity of the SiC. This program assumes that the resistivity of a thin film of conducting material deposited on another layer of conducting material is measured using the four-point probe. Using the four-point probe measurements, this program calculates the "true" resistivity of the deposited layer on a substrate of finite and different resistivity. Starting from basic principles, an expression for the ratio of measured voltage difference to injected current is developed. This expression involves the probe spacing, relative thicknesses of the layers, and the substrate resistivity as parameters, as well as the unknown resistivity of the deposited layer. The unknown resistivity can be found by iteratively evaluating the theoretical expression. This must be done numerically. The program is written in FORTRAN 77 and targeted for use on an IBM PC or compatible. It can be modified for use on any machine with a FORTRAN 77 compiler. It requires 46K of memory and has been implemented under MS-DOS 3.2.1. The program was developed in 1986.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: LEW-14389
    Format: text
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  • 90
    Publikationsdatum: 2011-08-24
    Beschreibung: Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) was developed to calculate the electromagnetic interaction between elements of an antenna array of circular apertures with specified aperture field distributions. The field distributions were assumed to be a superposition of the modes which could exist in a circular waveguide. Various external media were included to provide flexibility of use, for example, the flexibility to determine the effects of dielectric covers (i.e., thermal protection system tiles) upon the impedance of aperture type antennas. The impedance and radiation characteristics of planar array antennas depend upon the mutual interaction between all the elements of the array. These interactions are influenced by several parameters (e.g., the array grid geometry, the geometry and excitation of each array element, the medium outside the array, and the internal network feeding the array.) For the class of array antenna whose radiating elements consist of small holes in a flat conducting plate, the electromagnetic problem can be divided into two parts, the internal and the external. In solving the external problem for an array of circular apertures, CWG will compute the mutual interaction between various combinations of circular modal distributions and apertures. CWG computes the mutual coupling between various modes assumed to exist in circular apertures that are located in a flat conducting plane of infinite dimensions. The apertures can radiate into free space, a homogeneous medium, a multilayered region or a reflecting surface. These apertures are assumed to be excited by one or more modes corresponding to the modal distributions in circular waveguides of the same cross sections as the apertures. The apertures may be of different sizes and also of different polarizations. However, the program assumes that each aperture field contains the same modal distributions, and calculates the complex scattering matrix between all mode and aperture combinations. The scattering matrix can then be used to determine the complex modal field amplitudes for each aperture with a specified array excitation. CWG is written in VAX FORTRAN for DEC VAX series computers running VMS (LAR-15236) and IBM PC series and compatible computers running MS-DOS (LAR-15226). It requires 360K of RAM for execution. To compile the source code for the PC version, the NDP Fortran compiler and linker will be required; however, the distribution medium for the PC version of CWG includes a sample MS-DOS executable which was created using NDP Fortran with the -vms compiler option. The standard distribution medium for the PC version of CWG is a 3.5 inch 1.44Mb MS-DOS format diskette. The standard distribution medium for the VAX version of CWG is a 1600 BPI 9~track magnetic tape in DEC VAX BACKUP format. The VAX version is also available on a TK50 tape cartridge in DEC VAX BACKUP format. Both machine versions of CWG include an electronic version of the documentation in Microsoft Word for Windows format. CWG was developed in 1993 and is a copyrighted work with all copyright vested in NASA.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: LAR-15236
    Format: text
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  • 91
    Publikationsdatum: 2011-08-24
    Beschreibung: Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) was developed to calculate the electromagnetic interaction between elements of an antenna array of circular apertures with specified aperture field distributions. The field distributions were assumed to be a superposition of the modes which could exist in a circular waveguide. Various external media were included to provide flexibility of use, for example, the flexibility to determine the effects of dielectric covers (i.e., thermal protection system tiles) upon the impedance of aperture type antennas. The impedance and radiation characteristics of planar array antennas depend upon the mutual interaction between all the elements of the array. These interactions are influenced by several parameters (e.g., the array grid geometry, the geometry and excitation of each array element, the medium outside the array, and the internal network feeding the array.) For the class of array antenna whose radiating elements consist of small holes in a flat conducting plate, the electromagnetic problem can be divided into two parts, the internal and the external. In solving the external problem for an array of circular apertures, CWG will compute the mutual interaction between various combinations of circular modal distributions and apertures. CWG computes the mutual coupling between various modes assumed to exist in circular apertures that are located in a flat conducting plane of infinite dimensions. The apertures can radiate into free space, a homogeneous medium, a multilayered region or a reflecting surface. These apertures are assumed to be excited by one or more modes corresponding to the modal distributions in circular waveguides of the same cross sections as the apertures. The apertures may be of different sizes and also of different polarizations. However, the program assumes that each aperture field contains the same modal distributions, and calculates the complex scattering matrix between all mode and aperture combinations. The scattering matrix can then be used to determine the complex modal field amplitudes for each aperture with a specified array excitation. CWG is written in VAX FORTRAN for DEC VAX series computers running VMS (LAR-15236) and IBM PC series and compatible computers running MS-DOS (LAR-15226). It requires 360K of RAM for execution. To compile the source code for the PC version, the NDP Fortran compiler and linker will be required; however, the distribution medium for the PC version of CWG includes a sample MS-DOS executable which was created using NDP Fortran with the -vms compiler option. The standard distribution medium for the PC version of CWG is a 3.5 inch 1.44Mb MS-DOS format diskette. The standard distribution medium for the VAX version of CWG is a 1600 BPI 9~track magnetic tape in DEC VAX BACKUP format. The VAX version is also available on a TK50 tape cartridge in DEC VAX BACKUP format. Both machine versions of CWG include an electronic version of the documentation in Microsoft Word for Windows format. CWG was developed in 1993 and is a copyrighted work with all copyright vested in NASA.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: LAR-15226
    Format: text
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  • 92
    facet.materialart.
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: This paper describes how expansions in leaky (or improper) modes may be used to represent the continuous spectrum in an open radiating waveguide. The technique requires a thorough knowledge of the life history of the improper modes as they migrate from improper to proper Riemann surfaces. The method is illustrated by finding the electric field resulting from an impulsively forced current located in the free space above a grounded dielectric slab.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 42; 3; p. 340-346
    Format: text
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  • 93
    facet.materialart.
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    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: ROTRAN1 is a computer program to calculate the impedance and current gain of a simple transformer. Inputs to the program are primary resistance, primary inductance, secondary (load) resistance, secondary inductance, and mutual inductance. ROTRAN1 was written in BASICA for execution on the IBM PC personal computer. It was written in 1986.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-17697
    Format: text
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  • 94
    facet.materialart.
    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: Accurate computer modeling of passive circular waveguide components is often required during the design phase for optimizing frequency response and/or determining the tolerance required on components in order to meet radio frequency specifications. Many circular waveguide devices can be represented either exactly or approximately as a series of circular waveguide sections which have a common center. In addition, smooth tapers and horns of arbitrary profile may be approximated by a series of small steps. The Scattering Matrix Program for Circular Waveguide Junctions, CWGSCAT, computes the scattering matrix for a series of circular waveguide sections. These sections must possess the same center, but the radius and length of each section is completely arbitrary. Devices that may be analyzed include a simple waveguide step discontinuity, such as that used in a dual mode horn, a stepped matching section, or a corrugated waveguide section with constant varying slot depth. Certain types of corrugated horns may also be analyzed with this program. The model used will accurately predict the reflection and transmission characteristics of such devices, taking into account higher order mode excitation if it occurs as well as multiple reflections and stored energy at each discontinuity. For large devices, with respect to a wavelength where many modes may propagate, the reflection and transmission properties may be required for a higher order mode or series of modes exciting the device. Such interactions are represented best by defining a scattering matrix for the device. The matrix can be determined by using mode matching at each discontinuity present. The results for individual discontinuities are then cascaded to get the matrix for the entire device. CWGSCAT is written in FORTRAN to run on IBM PC series computers and compatibles running MS-DOS. It requires 355K of RAM. The standard distribution medium is a 5.25 inch 360K MS-DOS format diskette. CWGSCAT was developed in 1987, and this version was released in 1991. This program is a copyrighted work with all copyright vested in NASA. IBM is a registered trademark of International Business Machines. MS-DOS is a registered trademark of Microsoft Corporation.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-18708
    Format: text
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  • 95
    facet.materialart.
    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: In order to optimize frequency response and determine the tolerances required to meet RF specifications, accurate computer modeling of passive rectangular waveguide components is often required. Many rectangular waveguide components may be represented either exactly or approximately as a number of different size rectangular waveguides which are connected in series. RWGSCAT, Rectangular WaveGuide junction SCATtering program, solves for the scattering properties of a waveguide device. This device must consist of a number of rectangular waveguide sections of different cross sectional area which are connected in series. Devices which fall into this category include step transformers, filters, and smooth or corrugated rectangular horns. RWGSCAT will model such devices and accurately predict the reflection and transmission characteristics, taking into account higher order (other than dominant TE 10) mode excitation if it occurs, as well as multiple reflections and stored energy at each discontinuity. For devices which are large with respect to the wavelength of operation, the characteristics of the device may be required for computing a higher order mode or a number of higher order modes exciting the device. Such interactions can be represented by defining a scattering matrix for each discontinuity in the device, and then cascading the individual scattering matrices in order to determine the scattering matrix for the overall device. The individual matrices are obtained using the mode matching method. RWGSCAT is written in FORTRAN 77 for IBM PC series and compatible computers running MS-DOS. It has been successfully compiled and implemented using Lahey FORTRAN 77 under MS-DOS. A sample MS-DOS executable is provided on the distribution medium. It requires 377K of RAM for execution. Sample input data is also provided on the distribution medium. The standard distribution medium for this program is one 5.25 inch 360K MS-DOS format diskette. The contents of the diskette are compressed using the PKWARE archiving tools. The utility to unarchive the files, PKUNZIP.EXE, is included. An electronic copy of the documentation is included on the distribution medium in LaTEX format. RWGSCAT is also offered as a bundle with a related program, CWGSCAT (Scattering Matrix Program for Circular WaveGuide Junctions). Please see the abstract for RWGSCAT/CWGSCAT (COS-10045) for information about the bundled package. RWGSCAT was developed in 1993 and is a copyrighted work with all copyright vested in NASA.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-19091
    Format: text
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  • 96
    facet.materialart.
    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2011-08-24
    Beschreibung: DFACS is an interactive multi-user computer-aided engineering tool for system level electrical integration and cabling engineering. The purpose of the program is to provide the engineering community with a centralized database for entering and accessing system functional definitions, subsystem and instrument-end circuit pinout details, and harnessing data. The primary objective is to provide an instantaneous single point of information interchange, thus avoiding error-prone, time-consuming, and costly multiple-path data shuttling. The DFACS program, which is centered around a single database, has built-in menus that provide easy data input and access for all involved system, subsystem, and cabling personnel. The DFACS program allows parallel design of circuit data sheets and harness drawings. It also recombines raw information to automatically generate various project documents and drawings including the Circuit Data Sheet Index, the Electrical Interface Circuits List, Assembly and Equipment Lists, Electrical Ground Tree, Connector List, Cable Tree, Cabling Electrical Interface and Harness Drawings, Circuit Data Sheets, and ECR List of Affected Interfaces/Assemblies. Real time automatic production of harness drawings and circuit data sheets from the same data reservoir ensures instant system and cabling engineering design harmony. DFACS also contains automatic wire routing procedures and extensive error checking routines designed to minimize the possibility of engineering error. DFACS is designed to run on DEC VAX series computers under VMS using Version 6.3/01 of INGRES QUEL/OSL, a relational database system which is available through Relational Technology, Inc. The program is available in VAX BACKUP format on a 1600 BPI 9-track magnetic tape (standard media) or a TK50 tape cartridge. DFACS was developed in 1987 and last updated in 1990. DFACS is a copyrighted work with all copyright vested in NASA. DEC, VAX and VMS are trademarks of Digital Equipment Corporation. INGRES QUEL/OSL is a trademark of Relational Technology, Inc.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NPO-18408
    Format: text
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  • 97
    Publikationsdatum: 2013-08-31
    Beschreibung: A feasibility study is presented concerning an application of a superconducting linear synchronous motor (LSM) to a large-scale rocket launcher, whose acceleration guide tube of LSM armature windings is constructed 1,500 meters under the ground. The rocket is released from the linear launcher just after it gets to a peak speed of about 900 kilometers per hour, and it flies out of the guide tube to obtain the speed of 700 kilometers per hour at the height of 100 meters above ground. The linear launcher is brought to a stop at the ground surface for a very short time of 5 seconds by a quick control of deceleration. Very large current variations in the single-layer windings of the LSM armature, which are produced at the higher speed region of 600 to 900 kilometers per hour, are controlled successfully by adopting the double-layer windings. The proposed control method makes the rocket launcher ascend stably in the superconducting LSM system, controlling the Coriolis force.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Langley Research Center, Second International Symposium on Magnetic Suspension Technology, Part 2; p 607-621
    Format: application/pdf
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  • 98
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2013-08-31
    Beschreibung: A state-of-the-art instrumentation amplifier capable of being used with most types of transducers has been developed at the Kennedy Space Center. This Universal Signal Conditioning Amplifier (USCA) can eliminate costly measurement setup item and troubleshooting, improve system reliability and provide more accurate data than conventional amplifiers. The USCA can configure itself for maximum resolution and accuracy based on information read from a RAM chip attached to each transducer. Excitation voltages or current are also automatically configured. The amplifier uses both analog and digital state-of-the-art technology with analog-to-digital conversion performed in the early stages in order to minimize errors introduced by offset and gain drifts in the analog components. A dynamic temperature compensation scheme has been designed to achieve and maintain 12-bit accuracy of the amplifier from 0 to 70 C. The digital signal processing section allows the implementation of digital filters up to 511th order. The amplifier can also perform real-time linearizations up to fourth order while processing data at a rate of 23.438 kS/s. Both digital and analog outputs are available from the amplifier.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA, Washington, Technology 2003: The Fourth National Technology Transfer Conference and Exposition, Volume 2; p 342-348
    Format: application/pdf
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  • 99
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2013-08-31
    Beschreibung: The insulation testing and analysis consists of: identifying and prioritizing NASA wiring requirements; selecting candidate wiring constructions; developing test matrix and formulating test program; managing, coordinating, and conducting tests; and analyzing and documenting data, establishing guidelines and recommendations.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Lewis Research Center, Second NASA Workshop on Wiring for Space Applications; p 105-108
    Format: application/pdf
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  • 100
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2013-08-31
    Beschreibung: The topics are presented in viewgraph form and include the following: wiring responsibilities; purpose of the program; measurement of program effectiveness; results; and summary.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Lewis Research Center, Second NASA Workshop on Wiring for Space Applications; p 59-61
    Format: application/pdf
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