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  • 1
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract During the Volcanic Island Clastic Apron Project (VICAP), south of the Canary Islands, a total of 700 line-km multichannel seismic profiles were acquired. Two prominent reflectors (A and C) were observed alternately: A is the top of the volcanic apron. C, at a depth of about 5.8 s (two way traveltime twt), can be correlated to reflector R7, a marker dated mid-Miocene (16 Ma) at the DSDP site 397. The deepest reflection (E) in the basin was observed at 8 s (twt), which is an atypical oceanic basement.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Numerische Lösungen für zwei-dimensionale Konvektionsrollen in einer Flüssigkeitsschicht mit unendlicher Prandtlzahl sind gewonnen worden durch Anwendungen der Galerkin-Methode. Es wurden spannungsfreie isotherme Ränder an den Grenzen der horizontalen Flüssigkeitsschicht angenommen. Die Stabilität der stationären Lösungen bezüglich drei-dimensionaler Störungen wurde im Rayleighzahl-Wellenzahl-Raum analysiert. Es wurde gefunden, daß für Rayleighzahlen bis zu einigen Millionen ein Bereich der Wellenzahlα existiert, in dem die Konvektionsrollen stabil sind. Dieses Resultat steht im Gegensatz zu dem wohl bekannten Übergang zu bimodaler Konvektion im Fall der festen Ränder, ist aber im Einklang mit einfachen Betrachtungen über die Stabilität der thermischen Grenzschichten.
    Notes: Abstract Numerical solutions for two-dimensional convection rolls in a fluid layer of infinite Prandtl number are obtained by the Galerkin method. Stress-free, isothermal boundaries are assumed at the horizontal boundaries of the fluid layer. The stability of the steady solutions with respect to three-dimensional disturbances is analyzed in the Rayleigh number-wave number space. It is found that even for Rayleigh numbers as high as several millions there appears to exist a region of the wavenumber α where the convection rolls are stable. This result contrasts with the well known transition to three-dimensional bimodal convection in the presence of no-slip boundaries, but it agrees with simple arguments about the stability of the thermal boundary layers.
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  • 3
    Publication Date: 1992-12-01
    Description: The problem of convection driven by radial buoyancy in a rotating cylindrical annulus with conical end surfaces represents one of the basic models of rotating fluid dynamics with applications to convection in planets and stars. Although only two-dimensional equations govern the flow in the limit of high rotation rates, a surprising variety of different states of motion can be found. In this paper earlier numerical work is extended by the consideration of rigid boundary conditions at the cylindrical walls and by a study of spatially modulated convection. Of particular interest is the case of curved conical end surfaces which appears to promote the formation of separate cylindrical convection layers. © 1992, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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