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  • 1980-1984  (508)
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Jahr
  • 1
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    Unbekannt
    Mechanics of fold-and-thrust belts and accretionary wedges (1983)
    In:  J. Geophys. Res., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 88, no. 4, pp. 1153-1172, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Tectonics ; Friction ; Rock mechanics ; Fault zone ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    Slip instability and state variable friction laws (1983)
    In:  J. Geophys. Res., Kobe, Dec. 6-11, 1993, The Local Organizing Committee for the CRCM '93, vol. 88, no. B12, pp. 10359-10370, pp. 1517, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Friction ; Fracture ; Modelling ; ductile ; Rheology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Fracture mechanics as applied to hydraulic fracturing stress measurements (1983)
    In:  J. Earthquake Prediction Research, Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 2, no. 4, pp. 33-45, pp. 1517, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Fracture ; Rock mechanics ; Hydraulic fracturing ; Stress ; Stress measurements ; Earthquake precursor: prediction research
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Unbekannt
    Nucleation and growth of strike-slip faults in granite (1983)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 88, no. 3, pp. 555-568, pp. 1006, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Fracture ; Friction ; Stress ; cracks and fractures (.NE. fracturing) ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    Unbekannt
    Petrophysik: Physikalische Eigenschaften von Gesteinen und Mineralen (1983)
    Enke
    In:  Stuttgart, 403 pp., Enke, vol. 4, no. Publ. No. 12, pp. 267, (ISBN 3-534-14102-4)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Textbook of geophysics ; Rock mechanics ; Laboratory measurements ; Physical properties of rocks ; Schoen ; Schon
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
    facet.materialart.
    Unbekannt
    Su di una reciprocità tra deformazioni e distorsioni (1915)
    In:  Lincei Rend., Heidelberg, Elsevier, vol. 24, no. 5, pp. 404-408, pp. 2099, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1915
    Schlagwort(e): Dislocation ; Rock mechanics ; Elasticity
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    Unbekannt
    Sulle distorsioni dei sistemi elastici piani più volte connessi (1915)
    In:  Lincei Rend., Heidelberg, Elsevier, vol. 24, no. 5, pp. 575-576, pp. 2099, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1915
    Schlagwort(e): Dislocation ; Rock mechanics ; Elasticity
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
    facet.materialart.
    Unbekannt
    The phenomena of rupture and flow in solids (1921)
    In:  Phil. Trans. Roy. Soc., London, Dt. Geophys. Ges. e. V., vol. A221, no. B11, pp. 163-198, pp. L06304, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1921
    Schlagwort(e): Rock mechanics ; cracks and fractures (.NE. fracturing) ; Fracture ; Rheology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    Unbekannt
    Constitutive relations for fault slip and earthquake instabilities (1983)
    In:  Pageoph, Luxembourg, Conseil de l'Europe, vol. 121, no. 2, pp. 443-475, pp. 2131, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Friction ; Fracture
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 10
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    Unbekannt
    An evaluation of criteria to deduce the sense of movement in sheared rock (1983)
    In:  Geol. Soc. Am. Bull., Minsk, Polish Geothermal Association, vol. 94, no. 4, pp. 1281-1288, pp. TC5003, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Geol. aspects ; Rock mechanics ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Modelling ; Review article ; GSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 11
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    Unbekannt
    Boundary Element Method in Geomechanics (1983)
    Springer Verlag
    In:  Berlin, Springer Verlag, vol. 4, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN: 0-444-50309-9)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Fracture ; Boundary Element Method ; Elasticity
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 12
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    Unbekannt
    Witterungsverlauf und Ernteertrag in der Kurmark bei den Hauptgetreidearten und Kartoffeln. (1938)
    In:  Landwirtschaftl. Jahrbuch 86:823-924.
    Details
    Publikationsdatum: 1938
    Beschreibung: Erarbeitung einer ausbaufähigen Methode für das Erfassen des Witterungsablaufes; Vergleichen einer Zwölfjahresreihe von Erträgen mit dem Witterungsablauf; bearbeitet wurden Winterroggen, Winterweizen, Wintergerste, Hafer, Sommergerste, Sommerweizen, Kartoffeln KATASTER-BESCHREIBUNG: Zusammenhang Witterung und Ertrag bei Getreide und Kartoffeln KATASTER-DETAIL: Delta Wasserversorgung (Frühjahr) - und Delta Wasserversorgung (Mai, Juni, Juli) +, dann Ertrag (Getreide) +; Delta T (frühe Entwicklungsstadien) -, dann Ertrag (Winterroggen, Hafer) +; Delta T (April) -, dann Ertrag (Hafer) +; Delta Nied (April, Mai) -, dann Ertrag (Winterweizen) +; delta T (Mai) -, dann Ertrag (Winterroggen) +; Delta T +, dann Ertrag (Kartoffel) +; Delta Nied (Juli, August) +, dann Ertrag (Kartoffel) +;
    Schlagwort(e): Brandenburg ; 1924-37 ; Kartoffeln ; Ertrag ; Getreide ; Witterung
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 13
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    Unbekannt
    Niederschlags- und Erntemengen (1915)
    In:  Deut. Landwirtschaflt. Presse 42: 420-421
    Details
    Publikationsdatum: 1915
    Beschreibung: Korrelation der Sommer- und Winterniederschläge (Oktober-März) mit den Erträgen von Sommer- und Winterweizen, Roggen, Hafer, Gerste, Zuckerrüben und Kartoffeln, Winterniederschläge sind entscheidend für die Erträge, aber ertragsrelevanter sind die Sommerniederschläge und hier nicht in der Häufigkei, sondern der Menge im Zusammenspiel mit Temperatur, Sonnenscheindauer etc. KATASTER-BESCHREIBUNG: Beziehung zwischen der Niederschlagshöhe und dem Ertrag verschiedener Kulturen, getrennt für Winter- und Sommerniederschläge als Grafiken KATASTER-DETAIL:
    Schlagwort(e): Schlesien und Sachsen-Anhalt ; 1888-1907 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Getreide ; Korrelationsmethode ; Niederschlag ; Roggen ; Weizen
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 14
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    Unbekannt
    Körner- und Kartoffelerträge auf leichtem Sandboden. (1918)
    In:  Deutsche Landwirtschaftliche Presse 45:287-288.
    Details
    Publikationsdatum: 1918
    Beschreibung: Einfluss des Niederschlages auf die Höhe der Ertrages bei Getreide und Kartoffeln auf leichtem Sandboden KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Brandenburg ; 1910-1917 ; Kartoffeln ; Ertrag ; Niederschlag ; Trockenheit
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 15
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    Unbekannt
    Hat das Wetter einen Einfluss auf die Form der Kartoffelknolle? (1921)
    In:  Die Kartoffel, S. 90
    Details
    Publikationsdatum: 1921
    Beschreibung: Zusammenhang Niederschlag und Wachstum der Kartoffelknolle KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Kartoffeln ; Ertrag ; Niederschlag ; Trockenheit
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 16
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    Unbekannt
    Witterung und Phytophtora. Ursache, Krankheitsbild und Vorbeuge bei Krautfäule (1946)
    In:  Neue Mitteilungen für die Landwirtschaft 1, Heft 7; p.102-103
    Details
    Publikationsdatum: 1946
    Beschreibung: Krankheitsbild, Ursachen und Bekämpfung der Krautfäule werden kurz erörtert. Hierbei wird die Wichtigkeit feuchtwarmer Witterung um ca. 20°C für die Entwicklung des Erregers hervorgehoben. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Deutschland ; 1945 ; Kartoffeln ; Pflanzenkrankheit ; Hackfrüchte
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 17
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    Unbekannt
    Der Einfluss der Witterung auf die Reifezeit usw. (1921)
    In:  Die Kartoffel, Seite 136
    Details
    Publikationsdatum: 1921
    Beschreibung: Zusammenhang zwischen der Witterung und der Reifezeit der Kartoffelknolle KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Kartoffeln ; Ertrag ; Witterung
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 18
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    Unbekannt
    Pflanzliche Schädlinge landwirtschaftlicher Kulturpflanzen. In: Pflanzenschutz und Landwirtschaft - Zwei Vorträge (Herausg.: Wehner, H.) (1921)
    In:  Schriften der oekonomischen Gesellschaft im Freistaat Sachsen 8; No.3; p.1-24
    Details
    Publikationsdatum: 1921
    Beschreibung: Diskussion einiger wichtiger Pflanzenkrankheiten im Ackerbau, wie z.B. Brandkrankheiten verschiedener Kulturen und verschiedenen Kartoffelkrankheiten. Gestützt werden die Anmerkungen von regionalen Beispielen aus Deutschland. Teilweise wird Bezug zum Wetter hergestellt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Deutschland ; 1920-1921 ; Kartoffeln ; Getreide ; Pflanzenkrankheit ; Hackfrüchte
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 19
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    Unbekannt
    The effect of frost and decay upon the starch in potatoes (1918)
    In:  Jour. industr. and engin. Chem. 10; p.725-726
    Details
    Publikationsdatum: 1918
    Beschreibung: Laborversuche zur Untersuchung des Zusammenhangs zwischen Frosteinwirkung und Fäulebefall auf die Speisestärke der Kartoffel KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Schlagwort(e): Labor ; 1916-18 ; Kartoffeln ; Pflanzenkrankheit
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE INKA BB
  • 20
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    Unbekannt
    Stability of steady frictional slipping (1983)
    In:  J. Appl. Mech., Luxembourg, Conseil de l'Europe, vol. 50, no. 2, pp. 343-349, pp. 2131, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rheology ; Inelastic ; Friction ; Rock mechanics ; ductile ; instability
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 21
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    Unbekannt
    Boundary Element Methods in Solid Mechanics. With Application in Rock Mechanics and Geological Engineering (1983)
    Allen & Unwin
    In:  London, Allen & Unwin, vol. 231, no. 3, pp. 2-203, (ISBN 0-470-02298-1)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Fracture ; Boundary Element Method ; Elasticity ; Textbook of physics
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 22
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    Unbekannt
    Elasticity, Fracture and Flow (1983)
    Chapmann & Hall
    In:  London, Chapmann & Hall, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Textbook of geophysics ; Rock mechanics ; Fracture ; Elasticity ; Rheology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 23
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    Unbekannt
    Earthquake frequency distribution and the mechanics of faulting (1983)
    In:  J. Geophys. Res., Kunming, China, D. Reidel Publishing Company, vol. 88, no. 2, pp. 9331-9340, pp. L09303, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Seismicity ; Fracture ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 24
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    Unbekannt
    Numerische Modelle über den Einfluß partieller Schmelze auf elastische, anelastische und elektrische Eigenschaften von Gesteinen mit Anwendung auf Labordaten und die Asthenosphäre (1983)
    Universität Frankfurt/Main
    In:  Berichte des Instituts für Meteorologie und Geophysik, Universität Frankfurt/Main, Universität Frankfurt/Main, vol. 1034, no. 53, pp. 206, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Tectonics ; Earth model, also for more shallow analyses ! ; Velocity analysis ; Electromagnetic methods/phenomena ; Elasticity ; Physical properties of rocks ; earth mantle
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 25
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    Unbekannt
    A fracture mechanics study of experimentally deformed crustal rocks (1983)
    Univ. of London
    In:  Unpublished Ph.D. Thesis, London, Univ. of London, vol. C 560, 183 pp., no. GL-TR-89-0147, pp. 205-211, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Fracture ; Rock mechanics ; Laboratory measurements
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 26
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    Unbekannt
    Fracture toughness evaluation of rocks in the presence of pressurized water at elevated temperatures (1983)
    Martinus Nijhoff Publ.
    In:  Bull., Open-File Rept., Hydraulic Fracturing and Geothermal Energy, Boston, Martinus Nijhoff Publ., vol. IV, no. 1, pp. 291-305, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publikationsdatum: 1983
    Schlagwort(e): Rock mechanics ; Fracture ; Stress ; Hydraulic fracturing ; Geothermics ; ERYBACKI
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 27
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    Report on the Workshop on Intercomparison of Solar UV Irradiance Measurements and Related Instrument Calibration (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: The knowledge of the absolute value of the solar ultraviolet irradiance did not improve very much during the rising phase of the solar cycle 21. The variations associated with the solar rotation period were observed by means of three satellites, namely, the Atmospheric Explorer E (AE-E), Nimbus 7 and the Solar Mesospheric Explorer (SME). Long-term variations related to the solar activity cycle are not well known. Values were deduced during the solar cycle 21 from the AE-E satellite and the rocket program performed by the Laboratory for Atmospheric and Space Physics leading to variations of about a factor of 2 around 150 nm but definitely less than 20 percent beyond 175 nm. Such low level of variation is still masked by the current uncertainties and reproducibility of the observations performed since 1976. The uncertainties of recent observations are reported with their discrepancies. The gaps between the current accuracy goals and the achievements are still very important. The challenge for the next three years is to improve both the accuracy and the precision of future observations at the level of the available irradiance standards and to measure quantitatively long-term variations of the order of a few percent. The main causes of these gaps are identified.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 8; p 45-51
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 28
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    Electrodynamic coupling in magnetically confined stellar X-ray loops (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The solar coronal complex X-ray structure is now known to involve radiation loops that coincide spatially with the magnetic loops confining the radiating plasma. An effort is presently made to identify primary submodels involved in the global coupling between a mechanical energy reservoir of beta value greater than 1 and a contiguous site of X-ray activity whose beta value is lower than 1. The 'dynamo' model invoked establishes a quantitative connection between mechanical driver properties and the dimensions, field strength, and number density distribution of elemental magnetic loops.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 29
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    Two-phase turbine staging (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Two-phase turbines would be useful in Rankine cycles using low-quality or saturated-liquid working fluids. The chief problem is low efficiency due to slip losses in nozzles and due to liquid impact and friction losses in rotors. To raise efficiency, a staging method was tested in which the first stage operated at high speed with low relative liquid velocity, and the second stage recovered the first-stage exit energy. The theoretical efficiency for an experimental turbine operating with Refrigerant-22 was raised from 55 percent to 66 percent, and the measured efficiency was raised from 52 percent to 57 percent.
    Schlagwort(e): MECHANICAL ENGINEERING
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 30
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    DOE/NASA Automotive Stirling Engine Project Overview 83 (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: An overview of the DOE/NASA Automotive Stirling Engine Project is presented. The background and objectives of the project are reviewed. Project activities are described and technical progress and status are presented and assessed. Prospects for achieving the objective 30 percent fuel economy improvement are considered good. The key remaining technology issues are primarily related to life, reliability and cost, such as piston rod seals, and low cost heat exchanges. Previously announced in STAR as N83-27924
    Schlagwort(e): MECHANICAL ENGINEERING
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 31
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    Interpretation of vector magnetograph data including magneto-optic effects. I - Azimuth angle of the transverse field (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: In this paper, the presence of Faraday rotation in measurements of the orientation of a sunspot's transverse magnetic field is investigated. Using observations obtained with the Marshall Space Flight Center's (MSFC) vector magnetograph, the derived vector magnetic field of a simple, symmetric sunspot is used to calculate the degree of Faraday rotation in the azimuth of the transverse field as a function of wavelength from analytical expressions for the Stokes parameters. These results are then compared with the observed rotation of the field's azimuth which is derived from observations at different wavelengths within the Fe I 5250 A spectral line. From these comparisons, it is found: the observed rotation of the azimuth is simulated to a reasonable degree by the theoretical formulations if the line-formation parameter is varied over the sunspot; these variations are substantiated by the line-intensity data; for the MSFC system, Faraday rotation can be neglected for field strengths less than 1800 G and field inclinations greater than 45 deg; to minimize the effects of Faraday rotation in sunspot umbrae, MSFC magnetograph measurements must be made in the far wings of the Zeeman-sensitive spectral line.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 88; 51-64
    Format: text
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    NASA TECHNICAL REPORTS
  • 32
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    Dynamics of a surge observed in the C IV and H alpha lines (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Time sequences of a surge have been obtained in Active Region 2701 during a coordinated SMY program, on October 2nd, 1980, while the MSDP spectrograph operated in H-alpha at the Meudon Solar Tower and the UVSP spectrometer on SMM observed in the 1548 A C IV resonance line. The cold (H-alpha) and hot (C IV) material follow the same channel, and the event lasts about 10 min in both lines. A good correlation is found between H-alpha and C IV velocities; radial velocities along the surge are in the range 40-60 km/s in both cases. The observations are consistent with the hypothesis that a pressure gradient drives the surge. The H-alpha data seem to indicate the presence of a shock wave in the chromosphere, while the C IV quantities (velocities, accelerations) vary on a very short time scale. Their maxima occur at some locations which could be interpreted as 'pinched' zones.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics (ISSN 0004-6361); 127; 2, No; 337-344
    Format: text
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    NASA TECHNICAL REPORTS
  • 33
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    Influence of unbalance on the nonlinear dynamical response and stability of flexible rotor-bearing systems (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: In this paper, some of the effects of unbalance on the nonlinear response and stability of flexible rotor-bearing systems is presented from both a theoretical and experimental standpoint. In a linear system, operating above its stability threshold, the amplitude of motion grows exponentially with time and the orbits become unbounded. In an actual system, this is not necessarily the case. The actual amplitudes of motion may be bounded due to various nonlinear effects in the system. These nonlinear effects cause limit cycles of motion. Nonlinear effects are inherent in fluid film bearings and seals. Other contributors to nonlinear effects are shafts, couplings and foundations. In addition to affecting the threshold of stability, the nonlinear effects can cause jump phenomena to occur at not only the critical speeds, but also at stability onset or restabilization speeds.
    Schlagwort(e): MECHANICAL ENGINEERING
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  • 34
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    Differences in the temporal variations of solar UV flux, 10.7-cm solar radio flux, sunspot number, and Ca-K plage data caused by solar rotation and active region evolution (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Attention is given to two types of temporal variations in the solar UV spectral irradiance caused by solar rotation and active region evolution. It is noted that the first type of dissimilar temporal behavior occurs when concentrations of solar active regions evolve at solar longitudes nearly 180 deg apart. Both the UV observations and modeled UV fluxes based on Ca-K plage data then exhibit pronounced 13-day periodicity, whereas the 10.7-cm solar radio flux and sunspot number exhibit quite dissimilar temporal variations. This type of dissimilarity is related to the modeled UV flux and has a dependence on the solar central meridian distance that is narrower than that for the 10.7-cm radio flux or for sunspot numbers. A second case of marked dissimilarity is seen when major new solar active regions arise and dominate the full-disk fluxes for several rotations. It is found that the strongest peaks in 10.7 cm and sunspot numbers tend to occur on their first rotation, for example, during major dips in the total solar irradiance, whereas the Ca-K plages and UV enhancements peak on the next rotation and then decay more slowly on subsequent rotations.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 88; 9883-988
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  • 35
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    Ceramics potential in automotive powerplants (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The paper addresses the potential that ceramic materials can play an important role in future automotive powerplants - both advanced heat engines and advanced battery systems. A number of related experimental programs are reviewed including ceramics for gasoline and diesel piston engines, gas turbine and Stirling Engines and sodium-sulfur batteries. A strong integrated program to develop ceramics technology is recommended.
    Schlagwort(e): MECHANICAL ENGINEERING
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  • 36
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    The stability of coronal loops - Finite-length and pressure-profile limits (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Results are described from a quickly converging, necessary-and-sufficient, MHD-stability test for coronal-loop models. The primary stabilizing influence arises from magnetic line tying at the photosphere, and this end conditions requires a series expansion of possible loop excitations. The stability boundary is shown to quickly approach a limit as the number of terms increases, providing a critical length for the loop in proportion to its transverse magnetic scale. Several models of force-free-field profiles are tested and the stability behavior of a localized current channel, embedded in an external current-free region, is shown to be superior to that of other, broader, current profiles. Pressure-gradient effects, leading to increased or decreased stability, are shown to be amplified by line tying. Long loops must either conduct low net current, or exhibit an axial-field reversal coexisting with a low-pressure core. The limits on stability depend on the magnetic aspect ratio, the plasma-to-magnetic pressure ratio, and the field orientation at the loop edge. Applications of these results to the structure of coronal loops are described.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 88; 163-177
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  • 37
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    Implications of high-energy neutron observations from solar flares (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The time-dependent flux of high-energy neutrons discovered from the solar flare of 1980 June 21 provides a new technique for determining the total number and energy spectrum of accelerated protons and nuclei at the sun. The implications of these observations on gamma-ray emission, relativistic electron spectrum and number, proton and electron energy contents, and the location of the interaction region are also examined.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 273; L41-L45
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  • 38
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    Fluid motions in the solar chromosphere-corona transition region. IV - Mass motions over sunspot umbrae (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 273; 374-380
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  • 39
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    Solar irradiance variations. II - Analysis of the extreme ultraviolet measurements onboard the Atmosphere Explorer E satellite (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Five of the extreme ultraviolet channels (L-alpha, L-beta, He I, He II, Fe XV) measuring irradiance fluctuations on board the AE-E satellite between 1977 and 1980 have been studied in detail. It is shown that the daily variations correspond very closely to the daily variations in solar radio emission (F10.7), but that the UV data are afflicted with serious and to date unrecognized calibration changes during the period of operation of the instruments. In order to correct for these changes, a statistical analysis is carried out, and a set of corrections to the raw data is suggested. The resulting, now uniform, data are then compared with rocket measurements (L-alpha) and data acquired onboard the AE-C satellite (L-beta). Finally the remaining discrepancies are discussed. After concluding that they are below the overall level of uncertainties, a first-order 10-year run of EUV irradiances derived from F10.7 data is proposed. This estimate includes the ratio of irradiance levels between the maxima of solar cycles 20 and 21 and the intervening minimum.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 88; 9037-905
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  • 40
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    Determining the solar wind speed above active regions using remote radio-wave observations (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A new technique has made it possible to measure the velocity of portions of the solar wind during its flow outward from the sun. This analysis utilizes spacecraft (ISEE-3) observations of radio emission generated in regions of the solar wind associated with solar active regions. By tracking the source of these radio waves over periods of days, it is possible to measure the motion of the emission regions. Evidence of solar wind acceleration during this outward flow, consistent with theoretical models, has also been obtained.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Science (ISSN 0036-8075); 222; 506-508
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  • 41
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    Into mesh lubrication of spur gears with arbitrary offset oil jet. I - For jet velocity less than or equal to gear velocity (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: An analysis was conducted for into mesh oil jet lubrication with an arbitrary offset and inclination angle from the pitch point for the case where the oil jet velocity is equal to or less than pitch line velocity. The analysis includes the case for the oil jet offset from the pitch point in the direction of the pinion and where the oil jet is inclined to intersect the common pitch point. Equations were developed for the minimum oil jet velocity required to impinge on the pinion or gear and the optimum oil jet velocity to obtain the maximum impingement depth.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASME; 713-718
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  • 42
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    Long term technology development program (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: In the Advanced Adiabatic Development program, the following technology were identified as critical: piston development for oil-less, adiabatic engine; positive displacement compounding and charge system; experimental evaluation of the preheat concept; combustion system with positive ignition assist; and ceramic manufacturing technology. Of these five areas, ceramic manufacturing technology is the pacing item, and is already being addressed by several organizations. Therefore the four remaining areas need immediate attention. Since the lead time involved in engine development and production is long, this technology development should be done concurrently with the AAD engine development. A four year program is outlined which will simultaneously study these first four areas. This program requires two test rigs; one single cylinder adiabatic engine; and one multicylinder adiabatic turbocompound engine.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Advan. Automotive Diesel Assessment Program; 7 p
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  • 43
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    A.A.D. engine noise evaluation (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: A critique of the various characteristics of engine design influencing noise and attempts to indicator areas where attention is required to obtain noise acceptable engine for automobiles are discussed. It was concluded that the engine has a potential to be quiet beccause a ion rated speed is chosen. Problems with high gas pressure, the fuel injection pump, and the expander/compressor are discussed.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Cummins Engine Co., Inc. Advan. Automotive Diesel Assessment Program; 29 p
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  • 44
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    Screw expander for light duty diesel engines (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Preliminary selection and sizing of a positive displacement screw compressor-expander subsystem for a light-duty adiabatic diesel engine; development of a mathematical model to describe overall efficiencies for the screw compressor and expander; simulation of operation to establish overall efficiency for a range of design parameters and at given engine operating points; simulation to establish potential net power output at light-duty diesel operating points; analytical determination of mass moments of inertia for the rotors and inertia of the compressor-expander subsystem; and preparation of engineering layout drawings of the compressor and expander are discussed. As a result of this work, it was concluded that the screw compressor and expander designed for light-duty diesel engine applications are viable alternatives to turbo-compound systems, with acceptable efficiencies for both units, and only a moderate effect on the transient response.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Cummins Engine Co., Inc. Advan. Automotive Diesel Assessment Program; 46 p
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  • 45
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    Thermal and mechanical analysis of major components for the advanced adiabatic diesel engine (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The proposed design for the light duty diesel is an in-line four cylinder spark assisted diesel engine mounted transversely in the front of the vehicle. The engine has a one piece cylinder head, with one intake valve and one exhaust valve per cylinder. A flat topped piston is used with a cylindrical combustion chamber recessed into the cylinder head directly under the exhaust valve. A single ceramic insert is cast into the cylinder head to insulate both the combustion chamber and the exhaust port. A similar ceramic insert is cast into the head to insulate the intake port. A ceramic faceplate is pressed into the combustion face of the head to insulate the face of the head from hot combustion gas. The valve seats are machined directly into the ceramic faceplate for the intake valve and into the ceramic exhaust pot insert for the exhaust valve. Additional ceramic applications in the head are the use of ceramic valve guides and ceramic insulated valves. The ceramic valve guides are press fit into the head and are used for increased wear resistance. The ceramic insulated valves are conventional valves with the valve faces plasma spray coated with ceramic for insulation.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Advan. Automotive Diesel Assessment Program; 65 p
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  • 46
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    Advanced automotive diesel engine system study (1983)
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    Publikationsdatum: 2011-08-19
    Beschreibung: A conceptual study of an advanced automotive diesel engine is discussed. The engine concept selected for vehicle installation was a supercharged 1.4 liter, 4 cylinder spark assisted diesel of 14:1 compression ratio. A compounding unit consisting of a Lysholm compressor and expander is connected to the engine crankshaft by a belt drive. The inlet air charge is heated by the expander exhaust gas via a heat exchanger. Four levels of technology achievement on the selected engine concept were evaluated, from state-of-the-art to the ideal case. This resulted in the fuel economy increasing from 53.2 mpg to 81.7 mpg, and the 0-60 mph time decreasing from 17.6 seconds to 10.9 seconds.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Cummins Engine Co., Inc. Advan. Automotive Diesel Assessment Program; 18 p
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  • 47
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    A study of the Armstrong Whitworth swing beam engine for automotive application (1983)
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    Publikationsdatum: 2011-08-19
    Beschreibung: The introduction of ceramics to those parts suffering high thermal loading was successfully demonstrated, and there is no question that the 100 kw (134 hp) naturally aspirated engine of the future will be developed to produce up to 300 kw (402 hp) by the application of turbocharging or its equivalent. However, at the 60 - 80 kw (80 - 107 hp) size needed for the economic automotive engine, scaling down the 300 kw (402 hp) is beset by the laws of scale. The conventional four stroke diesel was not shown to be successful at the small high speed engine size. The opposed piston two stroke engine does not suffer the same laws of scale and engines in the low power range have already been marketed successfully. The half liter/cylinder Armstrong Whitworth Swing Beam Engine is the latest to be designed with the automotive market in mind. Its low noise structure and balanced linkage system coupled with advantages for easy start and potential use of low grade fuels, derived from its variable compression ratio and slow piston motion, qualifies it for the application.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Cummins Engine Co., Inc. Advan. Automotive Diesel Assessment Program; 3 p
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  • 48
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    Roller crosshead analysis (1983)
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    Publikationsdatum: 2011-08-19
    Beschreibung: An analysis of the frictional behavior of a roller crosshead configuration is given. This configuration consists of a piston which carries at the wristpin position a roller of large diameter which can roll on the cylinder liner surfaces. A preliminary assessment is given of whether the roller can roll on the cylinder liner without skidding, and what, if any, are the tribological implications of this approach to a dry lubricated design. The rotational speed of the roller must change during the stroke if it is not to slip on the cylinder liner. The maximum value of angular acceleration occurs at top dead center and bottom dead center. If the traction force on the rim of the roller, which is the product of the normal force due to piston side load and the coefficient of friction, is not sufficient to drive the roller through the necessary angular acceleration, sliding will occur. At 1,000 rpm, it appears that there will be a definite area of slip near each end of the stroke. The length of the area of slip may be of the order of 1/8 inch at each of these points.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Advan. Automotive Diesel Assessment Program; 9 p
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  • 49
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    Advanced Automotive Diesel Assessment Program, executive summary (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The objectives of this analytical study were: to select one advanced automotive diesel engine (AAD) concept which would increase the tank mileage of a 3,000 pound passenger car from the present 35 mpg to at least 52 mpg; to identify long term component research and development work required to bring the selected concept to fruition; and to prepare a development strategy that will bring the selected concept to a prototype testing phase. Cummins Engine Company has completed this study. The selected concept is a 4 stroke cycle, direct injection, spark assisted, advanced adiabatic diesel engine with positive displacement compounding plus expander and part load air preheating. The engine does not use a liquid coolant nor liquid lubricants. It is a 4 cylinder, in-line, 77 mm bore x 77 mm stroke, 1.434 liters displacement engine weighing 300 lb, and rated at 70 BHP at 3000 rpm. Installation dimensions are 621 mm length x 589 mm width x 479 mm height (24.4 inch x 22 inch x 18.9 inch).
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Advan. Automotive Diesel Assessment Program p; 59 p
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  • 50
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    Detailed performance analysis of the A.A.D. - concept B (1983)
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    Publikationsdatum: 2011-08-19
    Beschreibung: New concepts for engine performance improvement are seen through the adoption of heat regeneration techniques; advanced methods to enhance the combustion; and higher efficiency air handling machinery, such as the positive displacement helical screw expander and compressor. Each of these concepts plays a particular role in engine performance improvement. First regeneration has a great potential for achieving higher engine thermal efficiency through the recovery of waste energy. Although the concept itself is not new (this technique is used in the gas turbine), the application to reciprocating internal combustion engines is quite unusual and presents conceptual difficulties. The second important area is better control of the combustion process in terms of heat transfer characteristics, combustion products, and heat release rate. The third area for performance improvement is in the adoption of high efficiency air handling machinery. In particular, positive displacement helical expander and compressor exhibit an extremely high efficiency over a wide range of operating conditions.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Advan. Automotive Diesel Assessment Program; 46 p
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  • 51
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    Hydromagnetic waves, turbulence, and collisionless processes in the interplanetary medium (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: An extended discussion is conducted concerning the origin and evolution of interplanetary hydromagnetic waves and turbulence, and their influence on the large scale dynamics of the solar wind. The solar wind is at present the preeminent medium for the study of hydromagnetic waves and turbulence, providing an opportunity for advancement of understanding of the most fundamental processes of the astrophysical plasmas. All interplanetary fluctuations whose time scale is observed to be greater than 1 sec can be regarded as hydromagnetic fluctuations. It has been found to be simplest, and generally very satisfactory, to model interplanetary variations as fluctuations in an MHD fluid. Attention is given to the classification of wave modes, geometrical hydromagnetics, Alfven wave pressure, rugged invariants, and the kinetic theory of collisionless processes.
    Schlagwort(e): SOLAR PHYSICS
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  • 52
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    Behavior of transition-region lines during impulsive solar flares (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The emissions observed in lines originating in the transition-region plasma, particularly during impulsive flares, are investigated using data collected by the Ultraviolet Spectrometer and Polarimeter on the Solar Maximum Mission. Data concerning lines from ions such as Si II, C IV, Si IV, O V, and Fe XXI are analyzed. Topics examined include the transition region away from sunspots, oscillatory motions above sunspots, the shape of the transition region, the transition region during flares, and O V and Fe XXI during flare flash phases.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0038-0938)
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  • 53
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    Gamma-ray lines and neutrons from solar flares (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The energy spectrum of accelerated protons and nuclei at the site of a limb flare was derived by a technique, using observations of the time dependent flux of high energy neutrons at the earth. This energy spectrum is very similar to the energy spectra of 7 disk flares for which the accelerated particle spectra was previously derived using observations of 4 to 7 MeV to 2.223 MeV fluence ratios. The implied spectra for all of these flares are too steep to produce any significant amount of radiation from pi meson decay. It is suggested that the observed 10 MeV gamma rays from the flare are bremsstrahlung of relativistic electrons. Previously announced in STAR as N83-19695
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0038-0938)
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  • 54
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    A comparison of coronal and interplanetary current sheet inclinations (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The HAO white light K-coronameter observations show that the inclination of the heliospheric current sheet at the base of the corona can be both large (nearly vertical with respect to the solar equator) or small during Cararington rotations 1660 - 1666 and even on a single solar rotation. Voyager 1 and 2 magnetic field observations of crossing of the heliospheric current sheet at distances from the sun of 1.4 and 2.8 AU. Two cases are considered, one in which the corresponding coronameter data indicate a nearly vertical (north-south) current sheet and another in which a nearly horizontal, near equatorial current sheet is indicated. For the crossings of the vertical current sheet, a variance analysis based on hour averages of the magnetic field data gave a minimum variance direction consistent with a steep inclination. The horizontal current sheet was observed by Voyager as a region of mixed polarity and low speeds lasting several days, consistent with multiple crossings of a horizontal but irregular and fluctuating current sheet at 1.4 AU. However, variance analysis of individual current sheet crossings in this interval using 1.92 see averages did not give minimum variance directions consistent with a horizontal current sheet. Previously announced in STAR as N83-31566
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 88; Oct. 1
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  • 55
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    Practical small-scale explosive seam welding (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A small-scale explosive seam welding process has been developed that can significantly contribute to remote metal joining operations under hazardous or inaccessible conditions, such as nuclear reactor repair and assembly of structure in space. This paper describes this explosive seam welding process in terms of joining principles, variables, types of joints created, capabilities, and applications. Very small quantities of explosive in a ribbon configuration are used to create narrow (less than 0.5 inch), long-length, uniform, hermetically sealed joints that exhibit parent metal properties in a wide variety of metals, alloys, and combinations. The practicality of this process has been demonstrated by its current acceptance, as well as its capabilities that are superior in many applications to the universally accepted joining processes, such as mechanical fasteners, fusion and resistance welding, and adhesives. Previously announced in STAR as N83-24896
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: (ISSN 0025-6501)
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  • 56
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    The solar O III spectrum. II - Longer wavelengths, line widths, and the He II Lyman alpha radiation field (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The solar O III spectrum above 900 A is analyzed, including several visible and infrared lines which are important in nebular studies. The dependence of the line intensities on the rate of photoexcitation by He Ly-alpha is determined, and the observability of these lines in the solar spectrum is studied. The impact approximation is employed to calculate the expected line widths of the stronger solar O III lines. The photoexciting field at 304 A calculated from the observed intensities of the O III lines below 900 A (Bhatia et al., 1982) is compared with the field predicted by a recent model (Avrett et al., 1976). It is shown that additional radiation trapping must be present beyond that given by this model.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal Supplement Series (ISSN 0067-0049); 53; Sept
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  • 57
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    Measurements on a shock wave generated by a solar flare (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: It is shown that path-integrated radio-scattering measurements of the solar wind velocity yield higher estimates than those of point measurements. The post-shock speed is determined from radio scattering measurements by selection of the maximum of the radio-scattering deduced from the velocity-time curve, whereas velocity points on the rising edge of the shock underestimate the post-shock gas velocity, and therefore the shock speed. However, it is suggested that large uncertainties reside in using radio techniques for measurements of parameters of the shock wave, and the uncertainties may be large enough to encompass the lower velocity values calculated by a point method of measurement.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature (ISSN 0028-0836); 304; Aug. 25
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  • 58
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    Solar radius change between 1925 and 1979 (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: From an analysis of numerous reports from different locations on the duration of totality of the solar eclipses on January 24, 1925, and February 26, 1979, it is found that the solar radius at the earlier date was 0.5 arcsec (or 375 km) larger than at the later date. The correction to the standard solar radius found for each eclipse is different when different subsets of the observations are used (for example, edge of path of totality timings compared with central timings). This is seen as suggesting the existence of systematic inaccuracies in our knowledge of the lunar figure. The differences between the corrections for both eclipses, however, are very similar for all subsets considered, indicating that changes of the solar size may be reliably inferred despite the existence of the lunar figure errors so long as there is proper consideration of the distribution of the observations. These results are regarded as strong evidence in support of the occurrence of solar radius changes on shorter than evolutionary time scales.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature (ISSN 0028-0836); 304; Aug. 11
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  • 59
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    Solar oscillations with 13-day period (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Reference is made to the solar observations made by Claverie et al. (1982) over a three-month period in the summer of 1981 which show oscillatory velocity with a period of 13.1 days and amplitude of 6.6 m/s. These investigators reject the possibility that they see the Doppler shift from a radial oscillation, because the amplitude is implausibly large. They also do not believe that their signal was induced by solar magnetic fields, since typical mean solar fields are too small. Photo-electric drift-scan measurements of the solar diameter and full-disk magnetograms taken at Kitt Peak National Observatory are examined here for evidence of variations corresponding to the velocity oscillations of the 13.1-day period. An upper limit on radius variations is reported which is a factor of six below the amplitude needed to explain the velocity observations as a radial oscillation. Attention is also given to the possible role of the rotation of large-scale surface magnetic features.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature (ISSN 0028-0836); 304; Aug. 11
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  • 60
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    Formation of the Cl I line at 1351 A in the solar chromosphere (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The formation of the multiplet containing the Cl I 1351 A line is investigated due to the unusual brightness of this line. It is determined that this line is formed via a fluorescence effect driven by the 1335 A line of C II. Non-LTE calculations including this effect are found to agree with the observed line intensity. It is shown that the 1347 and 1363 A lines of Cl I do not benefit from this effect and they are predicted to be approximately 100 times weaker.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 266
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  • 61
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    Observations of solar oscillations of low and intermediate degree (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Measurements are presented of solar velocity oscillations with spherical harmonic degree 1-139 and angular order approximately 0. With an amplitude sensitivity of approximately 2 cm/s, trapped acoustic wave modes of radial orders 2-26 are observed at frequencies between 1.7 and 5.5 mHz. The radial order identifications of low-degree modes previously inferred from theory are confirmed. Only marginal evidence of long-period, gravity-mode oscillations is found.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature; 302; Mar. 3
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  • 62
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    Magnetic canopies in unipolar regions (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Base-height statistics are presented for magnetic canopies in six unipolar magnetic regions which were observed near the limb with the Kitt Peak Vacuum Telescope and Diode Array Magnetograph during the period 25 April-3 July, 1980. As in earlier studies, extensive areas are found to be covered by low-lying canopies.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 87; Aug. 198
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  • 63
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    Corotating pressure waves without fast streams in the solar wind (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Voyager 1 and 2 magnetic field and plasma data are presented which demonstrate the existence of large scale, corotating, non-linear pressure waves between 2 AU and 4 AU that are not accompanied by fast streams. The pressure waves are presumed to be generated by corotating streams near the sun. For two of the three pressure waves that are discussed, the absence of a stream is probably a real, physical effect, viz., a consequence of deceleration of the stream by the associated compression wave. For the third pressure wave, the apparent absence of a stream may be a geometrical effect; it is likely that the stream was at latitudes just above those of the spacecraft, while the associated shocks and compression wave extended over a broader range of latitudes so that they could be observed by the spacecraft. It is suggested that the development of large-scale non-linear pressure waves at the expense of the kinetic energy of streams produces a qualitative change in the solar wind in the outer heliosphere. Within a few AU the quasi-stationary solar wind structure is determined by corotating streams whose structure is determined by the boundary conditions near the sun. Previously announced in STAR as N83-19694
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 88; Aug. 1
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  • 64
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    Microwave and hard X-ray observations of a solar flare with a time resolution better than 100 ms (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Simultaneous microwave and X-ray observations are presented for a solar flare detected on 1980 May 8 starting at 1937 UT. The X-ray observations were made with the Hard X-ray Burst Spectrometer on the Solar Maximum Mission and covered the energy range from 28-490 keV with a time resolution of 10 ms. The microwave observations were made with the 5 and 45 foot antennas at the Itapetinga Radio Obervatory at frequencies of 7 and 22 GHz, with time resolutions of 100 ms and 1 ms respectively. Detailed correlation analysis of the different time profiles of the event show that the major impulsive in the X-ray flux preceded the corresponding microwave peaks at 22 GHz by about 240 ms. For this particular burst the 22 GHz peaks preceded the 7 GHz by about 1.5s. Observed delays of the microwave peaks are too large for a simple electron beam model but they can be reconciled with the speeds of shock waves in a thermal model. Previously announced in STAR as N82-30215
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 84; April 19
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  • 65
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    The isotopic composition of solar flare noble gases (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The relative elemental and isotopic abundances of noble gases provide insights into a number of topics related to the solar system. Neon is in many ways the most diagnostic of the noble gases. The diagnostic character is mainly related to the variation in the relative abundance of the two most abundant neon isotopes, Ne-20 and Ne-22. The available evidence suggests that trapped neon found in meteorites and in lunar samples consists of as many as five isotopically distinct components, including neon A, B, C, D, and E. Neon B has been shown to be due to solar wind neon which has been directly implanted into the material found in a meteorite. It appears that neon E is extrasolar in origin. There exist ambiguities regarding the origins of the remaining three components. The present investigation is concerned with a reexamination of the existing data in an effort to eliminate or at least clarify these ambiguities. It is found that neon C is apparently due to directly implanted, low-energy solar flare neon nuclei.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 266
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  • 66
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    Unified Analysis for Antenna Pointing and Structural Errors. Part 1. Review (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-10
    Beschreibung: A necessary step in the design of a high accuracy microwave antenna system is to establish the signal error budget due to structural, pointing, and environmental parameters. A unified approach in performing error budget analysis as applicable to ground-based microwave antennas of different size and operating frequency is discussed. Major error sources contributing to the resultant deviation in antenna boresighting in pointing and tracking modes and the derivation of the governing equations are presented. Two computer programs (SAMCON and EBAP) were developed in-house, including the antenna servo-control program, as valuable tools in the error budget determination. A list of possible errors giving their relative contributions and levels is presented.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: The Telecommun. and Data Acquisition Rept.; p 40-59
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  • 67
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    The rotational spectrum of g-modes in the sun (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Observations and calculations are presented which strongly suggest that the unique sequence of rotation rates due to g-modes is active in the sun. It is found that all angular harmonics from 1 = 2-11 appear to be resolved, while higher harmonics up to at least 1 = 20 also seem to be active. The extreme narrowness of many of the spectral lines indicates that the g-modes are locked in sets of constant 1 by a local mechanism which excites the modes and possibly regulates the long-term precision of their rotation. These sets act as a system of resonant, or nearly resonant, clocks which impose a degree of periodicity upon solar activity and measure the mean solar interior rotation
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 264
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  • 68
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    Observation of chromospheric evaporation during the Solar Maximum Mission (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A study is presented of the upward motions of part of the soft X-ray emitting plasma using data for flares collected in 1980 by the Bent Crystal Spectrometer and the Hard X-ray Burst Spectrometer on the Solar Maximum Mission satellite. Results show that upward motions of the soft X-ray plasma are temporally associated with the build up of the thermal phase of flares and with the period of energy deposition as indicated by the hard X-ray emission. In addition, it is found that the hardness of the hard X-ray spectrum, the evaporation velocity, and the rate of increase of the gradual phase are correlated. It is also possible that the total electron energy deposited in the chromosphere, the peak emission measure of the evaporating plasma, and the peak emission measure of the thermal coronal plasma may also be correlated.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0038-0938)
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  • 69
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    Conductive flux in the chromosphere derived from line linear polarization observation (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: It is shown that quantitative information on the mechanisms of energy transport which take place in solar flares can be obtained by measurement of impact line polarization. Linear polarization in two chromospheric lines (H-alpha and SI 1437 A) observed in the gradual phase of solar flares was investigated. The polarized electric vector is shown to be directed towards the center of the disk. The relationship between conductive heat flux and linear line polarization is determined using a function which represents the velocity distribution of electrons carrying heat flux. The relationship between linear polarization and heat flux is applied to the observed degree of polarization, which yields the conductive heat flux in the high chromosphere. It is determined that this conductive flux is of the order of magnitude of the total radiation loss in the chromosphere and below, which is also of the order of magnitude of the conductive flux in the transition zone.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0038-0938)
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  • 70
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    Radio blips and hard X-rays in solar flares (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The properties of short, narrow-band spikes occurring in groups at decimetric wavelengths have been extensively analyzed. The bursts, termed blips in the literature, have been found to appear in the impulsive phase of flares. They are associated with hard X-ray emission in 40 percent of all cases with simultaneous coverage. The correspondence between blips and X-ray spikes is generally not one-to-one, blips being more numerous than X-ray spikes. In some cases, however, close correlations between single events have been found. Blips have been discovered to drift in frequency and to decay in time similarly to type III bursts at lower frequency. They also resemble type III bursts in polarization. An analysis of starting frequencies, however, clearly shows that blips and type III bursts belong to different statistical populations. The narrow bandwidth of blips, the major qualitative difference with respect to type III bursts, suggests that blips are the signature of electron beams which either decay rapidly or have a locally enhanced emission due to the presence of some low-frequency wave. Blips have been shown to be an impulsive phase phenomenon occurring at densities of one to three billion per cu cm in the low corona.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 271; Aug. 1
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  • 71
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    Physical conditions in a quiescent prominence derived from UV spectra obtained with the UVSP instrument on the SMM (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A quiescent prominence observed above the north-west limb on November 20, 1980, is analyzed using data obtained with the UV spectrometer and polarimeter (UVSP) on the Solar Maximum Mission (SMM). The spectral data include the lines 1215 A of H1, 1401 A of OIV, 1402 A of SIIV, 1548 A of CIV, 1640 A of HeI, and 1655 A of CI. From an analysis of these lines and their emission patterns, the physical characteristics of the prominence plasma are deduced, and it is suggested that the prominence consisted of flux tubes at various temperatures. In the hotter parts of the plasma the number density reached values of about 3 x 10 to the 11th/cu cm.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 84; April 19
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  • 72
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    Vertical gradients of sunspot magnetic fields (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The results of a Solar Maximum Mission (SMM) guest investigation to determine the vertical gradients of sunspot magnetic fields for the first time from coordinated observations of photospheric and transition-region fields are described. Descriptions are given of both the photospheric vector field of a sunspot, derived from observations using the NASA Marshall Space Flight Center vector magnetograph, and of the line-of-sight component in the transition region, obtained from the SMM Ultraviolet Spectrometer and Polarimeter instrument. On the basis of these data, vertical gradients of the line-of-sight magnetic field component are calculated using three methods. It is found that the vertical gradient of Bz is lower than values from previous studies and that the transition-region field occurs at a height of approximately 4000-6000 km above the photosphere.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 84; April 19
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  • 73
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    Dynamics and spectroscopy of asymmetrically heated coronal loops (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Numerical models of steady flows along coronal magnetic flux tubes of varying cross sectional areas are investigated. The flows are induced by altering the spatial symmetry of the heating. In two cases the flux tube geometry is symmetric about the top of the loop, but the spatial dependence of the heating rate is changed from a symmetric deposition which supports a stationary equilibrium to a time-independent asymmetric deposition. In a third case the volumetric heating rate is uniform, but one half of the loop is larger in volume than the other. The resulting velocity structure varies significantly with changes in the flux tube geometry. Calculations of the ionization balance and line emission for a number of ionization stages of oxygen suggest that heating induced flows may be responsible for the redshifts seen in spectral lines formed in the network at transition region temperatures.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 267
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  • 74
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    Ferrographic and spectrometer oil analysis from a failed gas turbine engine (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An experimental gas turbine engine was destroyed as a result of the combustion of its titanium components. It was concluded that a severe surge may have caused interference between rotating and stationary compressor parts that either directly or indirectly ignited the titanium components. Several engine oil samples (before and after the failure) were analyzed with a Ferrograph, and with plasma, atomic absorption, and emission spectrometers to see if this information would aid in the engine failure diagnosis. The analyses indicated that a lubrication system failure was not a causative factor in the engine failure. Neither an abnormal wear mechanism nor a high level of wear debris was detected in the engine oil sample taken just prior to the test in which the failure occurred. However, low concentrations (0.2 to 0.5 ppm) of titanium were evident in this sample and samples taken earlier. After the failure, higher titanium concentrations (2 ppm) were detected in oil samples taken from different engine locations. Ferrographic analysis indicated that most of the titanium was contained in spherical metallic debris after the failure. The oil analyses eliminated a lubrication system bearing or shaft seal failure as the cause of the engine failure. Previously announced in STAR as N83-12433
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Wear (ISSN 0043-1648); 90; 239-249
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  • 75
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    Microwave signatures from a reconnecting plasma pinch, with application to loop flares (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A calculation is made of microwave signature of a cylindrical plasma pinch undergoing magnetic reconnection, a process which occurs in many astrophysical situations, such as solar flares. Depending on the viewing angle and the average energy of the accelerated electrons, the microwaves from this betatron-like source show various amounts of circular polarization. The degree of polarization is shown to be frequency dependent, and the sense of polarization is sometimes reversed. The power spectrum is predicted to have several interesting properties, which can be compared with high-resolution measurements.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 275; 901-915
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  • 76
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    Effects of core perturbations on the structure of the sun (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The effects of perturbing the inner part of the solar core where the hydrogen abundance has been partially depleted by nuclear burning are investigated. Small regions are mixed within the core and the evolution of the resulting luminosity and radius perturbations is followed. The sensitivity of the solar luminosity and radius to mixing events of different sizes and at different locations in the core is determined and several relationships between the luminosity and radius perturbations are examined to see if the value of one of these perturbations can be inferred from a measurement of the other. It is found that any core perturbation which alters the hydrostatic structures will immediately affect the solar luminosity and radius. The behavior of these perturbations depends on the location of the mixing event within the core. Mixing events cannot produce the decrease in the solar radius without leading to a homogeneous evolution of the solar core and/or to a prohibitively large change in the solar luminosity.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 273; 795-804
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  • 77
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    Si III line ratios in the sun (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: New atomic data for Si III have been used to predict level populations and emission-line intensity ratios for electron densities and temperatures appropriate to the solar transition region. The electron impact collision rates used here are substantially larger than those previously published owing to delineation of the complex resonance structures in the low-energy collision strengths. This together with small changes in the spontaneous radiative rates produces significant changes in the calculated intensity ratios. Generally good agreement is found with observations obtained using the Naval Research Laboratory slit spectrograph aboard Skylab, electron densities from three Si III ratios and from other methods normally agreeing to 0.2 dex or better for a wide variety of solar features. For a fourth ratio, incorporating lines with a wide wavelength separation, the agreement is less satisfactory, possibly owing to uncertainties in the observational data.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 274; 420-428
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  • 78
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    Lines of Fe XII sensitive to coronal electron density (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Lines of Fe XII sensitive to coronal electron density are discussed. The lines appear in solar spectra obtained by the Naval Research Laboratory (NRL) slit spectograph flown on Skylab. These lines are due to transitions between levels of the 3s 2 3p 3 configuration and fall at the wavelengths 1242.03 A, 1349.38 A, 2169.03 A, 2405.71 A, and 2565.99 A. It is shown that the line at 2169.03 A is severely blended by a line of Ni II at heights less than 12 arcsec outside the solar limb. Above 12 arcsec the lines at 2169.03 and 2405.71 A are apparently unblended and can be used to derive electron densities. An average coronal electron pressure of 6 x 10 to the 14th/cu cm K is obtained. However, the emitting path lengths of the Fe XII lines, deduced using the electron densities and absolute intensities, are unrealistically large. The reason for this difficulty is unclear.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 273; 822-828
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    Metal shell technology (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Metallic shells are fabricated for a size range from several millimeters down to less than 500 microns in diameter. The technology, developed at JPL, is based on the hollow-jet instability for the large-shell formation, and in addition, on the Bernoulli's force for the microbubble generation. Various materials were processed into hollow spheres, such as AL1100, tin, lead, and a metallic glass-forming alloy, AuPbSb. They exhibited a range of contrasting solidification behaviors and surface characteristics. Some of their potential applications will be explored in this paper.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: SAMPE Journal (ISSN 0091-1062); 19; 7-11
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  • 80
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    Determination of solar wind elemental abundances from M/Q observations during three periods in 1980 (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Mass spectra in the M/Q range from 2 to 3, provided by a high-resolution mode of the ISEE-3 Plasma Composition Experiment, were evaluated for three selected periods during early 1980. The observed Ne/O ratios are compatible with estimated solar abundance ratios. In two of the three periods, the He/Ne-ratios agree with the Apollo foil results. Freezing-in temperatures for oxygen are similar to those obtained by other groups. Possible reasons for an unexpectedly high flux at M/Q = 2.4 are discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 88; 359-376
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  • 81
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    Thermodynamic analysis of journal bearings operating under steady state loading in laminar regime (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Thermohydrodynamic effects in journal bearings operating under steady load in laminar regime are investigated. An analytical model for the finite and infinitely long journal bearings is formulated. The model includes correction factors for the cavitation effects in the unloaded region of the bearing and the mixing of the recirculating oil and supply oil at the oil inlet. A finite difference computer program is developed to numerically solve the governing equations of the continuity, Reynolds, energy, Laplace heat conduction, and a viscosity-temperature relation simultaneously. The program includes a numerical technique for obtaining an isothermal shaft temperature. The numerical results of temperature distribution and the heat effects on the bearing load carrying capacity agree closely with those of experimental findings. Several different sets of simpler boundary conditions for the energy equation are studied.
    Schlagwort(e): MECHANICAL ENGINEERING
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  • 82
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    Solar flare X-ray spectra from the P78-1 spacecraft (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Results from the high resolution solar X-ray spectrometer experiments on the P78-1 spacecraft are discussed. These results concern physical quantities such as electron temperature and density, turbulence, mass motions, and state of ionization equilibrium, characteristic of the thermal soft X-ray emitting flare plasma, and the time behavior of these quantities during flares. In addition, a brief description of the instruments is given, the plasma diagnostics used in interpreting the spectra are summarized, and the origin of the thermal soft X-ray emitting plasma is discussed in light of the P78-1 results, earlier data, and numerical simulations of magnetic flux tubes heated to solar flare temperatures.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0038-0938)
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  • 83
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    Purely coronal flare-like variations (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Quasiperiodic X-ray, UV, microwave, and metric-wave variations after a solar flare on November 6, 1980 are reported and analyzed, based on observational data from SMM (HXRBS, UVSP, HXIS), GOES-2, the 100-m radiotelescope at Bonn, and the Nancay radioheliograph. The maxima of the 13 brightenings observed are listed and characterized; a comparison is made with a 'normal' flare at 17:26 UT on the same day. The HXIS and UVSP data are discussed in terms of the physical properties, X-ray flux, O V flux, and H-alpha flux. The variations are found to be mainly thermal and purely coronal, with no chromospheric (H-alpha) participation (in contrast to the 17:26 flare). Since strong X-ray emissions were observed which should have involved the chromosphere through magnetic-field-line heat conduction, it is proposed that the variations wre produced ina coronal plasmoid magnetically separate from the chromosphere. A mechanism for the evolution of such a plasmoid from the upper loops of a giant X-ray arch is discussed. An iterative HXIS-image-deconvolution process is presented in an appendix.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 85; June 198
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  • 84
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    Expected intensities of solar forbidden lines emitted from 2p(k) (k = 2, 3, 4) configurations (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Predicted intensities of all significant transitions within the ground configurations of six-, seven-, and eight-electron ions are tabulated for solar conditions, on a common scale. Some applications of the table entries to line identification and emission measure analysis are presented, including proposed Mg VI classifications for the coronal lines 3488.5 A and 3502.5 A.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 85; May 1983
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    Heliospheric magnetic fields and plasmas (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: A survey of the existing literature on heliospheric physics, covering the period 1972-1982, is presented. Attention is given to observations and theories germane to the examination of the heliosphere as a large-scale astrophysical system that is part of the earth's environment. The literature includes data and models for magnetic sectors and the large-scale magnetic field, the large-scale plasma structure, and models and observed variations in the solar wind. Consideration is also devoted to the transient and corotating streams and shocks, the composition of the solar wind, and to MHD turbulence, waves, and discontinuities. More intensive investigations of the region near 1 AU are recommended, particularly to characterize the coronal source of the solar wind. The solar polar mission will be the first to provide radial measurements for comparisons with previous exclusively ecliptic measurements of solar activities.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0034-6853)
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  • 86
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    Evidence for inhomogeneous thermal sources of two similar solar spike events of 1978 May 5 and December 4 (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Two short duration single spike solar events of 1978 May 5 and December 4 exhibit similar time profiles in the microwave and hard X-ray ranges, indicating emission from compact sources. Microwave spectral observations exhibit inhomogeneities present in the source parameters. The existence of fine time structures in the microwave time profiles at 10.4 GHz from Berne are interpreted as a signature of the dynamics of a disturbance traveling through the source at the ion-sound speed. Stereoscopic observations with the hard X-ray detector on the solar orbiter, Helios-2, and the Berne microwave antenna do not indicate any time lag or differences in the time profiles during the impulsive phase. This is taken as evidence for the absence of directionality of emission making beam models unlikely for short duration single spike events. Previously announced in STAR as N83-13047
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 270; July 1
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  • 87
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    The influence of surface dents and grooves on traction in sliding EHD point contacts (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Changes in traction, caused by dents and grooves on a highly polished ball, are investigated as these defects approach and go through sliding elastohydrodynamic point contacts. The contacts are formed with the ball loading against a transparent disk. The ball and thus the topographical features are held stationary at various locations in the vicinity and within the contact while the disk is rotating. These topographical features can cause substantial changes in the traction when compared to traction obtained with smooth surfaces. Previously announced in STAR as N82-32734
    Schlagwort(e): MECHANICAL ENGINEERING
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  • 88
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    Plastic deformation and wear process at a surface during unlubricated sliding (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The plastic deformation and wear of a 304 stainless steel surface sliding against an aluminum oxide rider with a spherical surface (the radius of curvature: 1.3 cm) were observed by using scanning electron and optical microscopes. Experiments were conducted in a vacuum of one million Pa and in an environment of fifty thousandth Pa of chlorine gas at 25 C. The load was 500 grams and the sliding velocity was 0.5 centimeter per second. The deformed surface layer which accumulates and develops successively is left behind the rider, and step shaped proturbances are developed even after single pass sliding under both environmental conditions. A fully developed surface layer is gradually torn off leaving a characteristic pattern. The mechanism for tearing away of the surface layer from the contact area and sliding track contour is explained assuming the simplified process of material removal based on the adhesion theory for the wear of materials. Previously announced in STAR as N82-32735
    Schlagwort(e): MECHANICAL ENGINEERING
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  • 89
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    Fluid motions in the solar chromosphere-corona transition region. III - Active region flows from wide slit Dopplergrams (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Large-scale velocity patterns observed in C IV in active regions show close correspondence with photospheric magnetic field patterns. In a large majority of cases, magnetic neutral lines show blueshift on their sun center side and redshift on their limbward side. The large-scale flow is consistent with widespread loop structure having downflow in both legs of the loops. Studies of individual bright loops, confirm that the flow is downward in most cases. However, an important subset of loops show flow from one end of the loop to the other.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 15
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  • 90
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    Atomic calculations for the Fe XX X-ray lines (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The atomic data presented here and in Bhatia and Mason (1980) allow the calculation of theoretical intensity ratios for all the EUV, UV, and X-ray lines from Fe XX. Tabulations are presently given for the transitions between levels in the 2s2 2p3, 2s2 2p2 3s, and 2s2 2p2 3d configurations of Fe(19+), and electron collision strengths are calculated by means of the 'distorted wave' approximation. In addition to the theoretical X-ray line intensity ratios, new spectral line identifications from a solar flare are presented.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138); 52; April 19
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  • 91
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    Atomic calculations for Ca XVII - UV and X-ray lines (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Doschek et al. (1977) have pointed out the importance of the Ca XVII UV lines as an electron density diagnostic. Energy levels, transition probabilities, and collision strengths, are presently obtained for the 2s2, 2s 2p, 2p2, 2s 3s, 2s 3p, and 2s 3d configurations of Ca XVII, and the theoretical intensity ratios for the UV and X-ray lines are compared with observed intensities in solar flare spectra. Inconsistencies are indicated in the analysis of UV data, and discrepancies between observed and theoretical intensity ratios indicate that further studies are required. New identifications are suggested in the X-ray wavelength region.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138); 52; April 19
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  • 92
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    Conductive flux in flaring solar chromospheres deduced from the linear polarization observations (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 119; 2, Ma; Mar. 198
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  • 93
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    Models of the formation of the solar nebula (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Protostellar cloud collapse and solar nebula formation models indicate that the size of the nebula produced will be larger in terms of both gas centrifugal balance R(CF) and collapse time diffusion length R(V). From this, it can be deduced that low mass nebulas are produced if (R(V)/R(CF))-squared is much greater than unity, while nebulas result for values lower than approximately unity. The total angular momentum value distinguishes most current models of the solar nebula. Analytic expressions for the surface density, nebular mass flux and photospheric temperature distributions during the formation stage are presented for simple modes illustrating and general properties of growing protostellar disks.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Icarus; 53; Jan. 198
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  • 94
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    Multiple transonic solutions with a new class of shock transitions in steady isothermal solar and stellar winds (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: It is shown that a new class of shock transitions arises in the transonic solutions of the steady isothermal solar wind equations when momentum deposition and/or nonradial flow tube divergence give rise to multiple critical points in the flow. These shock transitions between critical solutions occur for a certain range of the parameters which characterize the momentum deposition function. The isothermal wind equations allow multiple transonic solutions in the presence of such shock transitions, yielding a continuous solution passing through an inner critical point and solutions involving a shock transition between critical solutions. It is determined that these multiple transonic solutions have the same flow speed at the base but different supersonic flow speeds at infinity. It is found that the nonradial flow tube divergence and momentum addition are equivalent, which gives rise to multiple critical points and hence to multiple transonic solutions with shock transitions. In addition, the physical relevance of these properties are examined for astrophysical systems such as the inner solar wind, flows in extragalactic jets, and accretion discs.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 88; Mar. 1
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  • 95
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    Facular influences on the apparent solar shape (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The problem of the influence of faculae on apparent solar shape is examined in light of general facular contrast models. The diagonal components of the oblateness signal from the faculae observed are calculated, and it is found that the faculae can contribute a signal whose time dependence is similar to that of the Dicke and Goldenberg (1967) oblateness signal, allowing an acceptable fit to the oblateness measurements for a facular contrast within the range of acceptable values.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature; 301; Jan. 13
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  • 96
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    Numerical simulations of loops heated to solar flare temperatures. I - Gasdynamics. II - X-ray and UV spectroscopy (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The NRL's Dynamic Flux Tube Model is used to numerically simulate the dynamic response of a coronal magnetic loop to an energy input of the order encountered in solar flares. The coronal plasma is heated by the deposition of flare energy at the top of the loop to more than 10 million K, yielding a conduction front that moves toward the chromosphere, where the plasma is heated by the large downward conductive flux and ablates upward to the coronal part of the loop at velocities of a few hundred km/sec. The conduction front simultaneously produces chromospheric ablation and compresses the material ahead of it. With the aid of compressional instabilities, the compressed plasma grows throughout the flare heating phase, presenting a possible source of the flare optical continuum emission which is correlated with soft X-ray radiation. The observational consequences of rapidly heated loop gas dynamic processes are discussed. In the second part of this presentation, the dynamical calculation results previously obtained are used to predict the spectral line intensities, profiles and wavelengths of several X-ray lines and the UV line of Fe XXI at 1354.1 A. Three different viewing orientations of the loop are considered.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 265
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  • 97
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    Impact linear polarization observed in a UV chromospheric line during a solar flare (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 265
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  • 98
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    Simultaneous ultraviolet line and hard X-ray bursts in the impulsive phase of solar flares (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 265
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  • 99
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    Fluid motions in the solar chromosphere-corona transition region. I - Line widths and Doppler shifts for C IV (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Schlagwort(e): SOLAR PHYSICS
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  • 100
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    Progress and problems in the theory of type III solar radio emission (1983)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The experimental and theoretical status of type III solar radio emission is considered in detail. Very recent developments which are relevant to the underlying plasma physics are emphasized. In particular, the identity of the submegahertz emissions as fundamental, or second harmonic, the degree of correlation between emissivities, electron streams, and plasma (Langmuir) waves, paradoxes concerned with the time-ordering of these phenomena, and the role of background density irregularities and ion-acoustic turbulence in the solar wind, are discussed. From the theoretical point of view, the current picture of the underlying Langmuir turbulence, including such effects as the interaction between Langmuir waves and stream electrons, induced scatter off ions, and strong turbulence effects such as modulational instability and soliton collapse, is discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics (ISSN 0038-0938); 89; 403-442
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