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  • 1
    Publication Date: 2020-02-12
    Description: The southern Hikurangi Subduction Margin is characterized by significant accretion with predicted high rates of fluid expulsion. Bottom simulating reflections (BSRs) are widespread on this margin, predominantly occurring beneath thrust ridges. We present seismic data across the Porangahau Ridge on the outer accretionary wedge. The data show high-amplitude reflections above the regional BSR level. Based on polarity and reflection strength, we interpret these reflections as being caused by free gas. We propose that the presence of gas above the regional level of BSRs indicates local upwarping of the base of gas hydrate stability caused by advective heatflow from upward migrating fluids, although we cannot entirely rule out alternative processes. Simplified modelling of the increase of the thermal gradient associated with fluid flow suggests that funnelling of upward migrating fluids beneath low-permeability slope basins into the Porangahau Ridge would not lead to the pronounced thermal anomaly inferred from upwarping of the base of gas hydrate stability. Focussing of fluid flow is predicted to take place deep in the accretionary wedge and/or the underthrust sediments. Above the high-amplitude reflections, sediment reflectivity is low. A lack of lateral continuity of reflections suggests that reflectivity is lost because of a destruction of sediment layering from deformation rather than gas-hydrate-related amplitude blanking. Structural permeability from fracturing of sediments during deformation may facilitate fluid expulsion on the ridge. A gap in the BSR in the southern part of the study area may be caused by a loss of gas during fluid expulsion. We speculate that gaps in otherwise continuous BSRs that are observed beneath some thrusts on the Hikurangi Margin may be characteristic of other locations experiencing focussed fluid expulsion.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 35 (1966), S. 521-558 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 23 (1969), S. 539-578 
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
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    Unknown
    Ithaca, N.Y. : Periodicals Archive Online (PAO)
    Industrial and Labor Relations Review. 22:3 (1969:Apr.) 475 
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 23 (1967), S. 146-147 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'application de courants vibrés sinusoidaux au travers du crâne chez le chien fit varier la quantité des acides gras du plasma, de la glucose du sang et la pression artérielle. L'application d'un courant de 30 mA provoque une faible augmentation des acides gras du plasma, sans augmentation de la pression artérielle.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 11 (1968), S. 413-426 
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 7 (1967), S. 441-446 
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The early experimental work of Clark and Wood with regard to von Kármán's theory on the effect of material flow and fracture at high strain rates has led to many controversial issues on these effects. Interest has been greatly revived in recent years because of the increased emphasis on such high-velocity forming processes as explosive and capacitor discharge. Considerable new work has been performed by Ling-Temco-Vought, Inc., for the Air Force, the results of which are presented in this paper. Data have been accumulated on tensile and compression specimens, spherical bulging and cylindrical bulging for a wide variety of materials. This high-speed information has been generated with the use of a special projectile impact machine and special presses utilizing various combinations of explosive and capacitor-discharge energy, with strain rates to 101/sec. The effect of velocity on ductility is discussed for total strain distribution, uniform strain, double necking and critical impact velocity. The modes of failure for various part shapes are presented and related to the forming velocity.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 4 (1968), S. 277-285 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé Ce rapport decrit le developpement d'une nouvelle methode d'essai des materiaux en tension hydrostatique, qui consiste a faconner une eprouvette de forme spherique et a la coller au centre d'un cube constituant support, et qui est soumis a des sollicitations de traction sur chacune de ses faces. On choisit le materiau du cube de telle sorte que la rupture se produise d'abord dans l'eprouvette du materiaux a essayer; le recours a la theorie de l'elasticite permet d'estimer Fetat de tensions dans celle-ci. La rupture est detectee par les deplacements des aretes du cube. Bien que, jusqu'a present, les resultats obtenus sur du platre dentaire fragile Waient conduit qu'a des conclusions fragmentaires, la technique utilisee semble prometteuse pour ses developpements futurs.
    Abstract: Zusammenfassung Die Artikel beschreibt die Entwicklung einer neuen Methode zur Materialprufung mittels hydrostatischer Spannungen, wobei ein spharisch gekrummeter Prufling im Zentrum eines als Matrixmaterial dienenden Wurfels angebracht wird and die Spannungen an den Wurfelseiten angreifen. Die Materialien werden derart ausgewahlt, dass ein Bruch zuerst im Prufmaterial auftritt, dessen Span nungsbeanspruchung aus der Elastizitatstheorie abgeschatzt werden kann. Ein Bruchauftreten wird durch die Kantenverschiebungen der Wurfelflachen festgestellt. Obwohl die Ergebnisse fur sproden Zahngips bis heute noch nicht uberzeugend waren, scheint eine Weiterentwicklung dieser Methode vielversprechend zu sein.
    Notes: Abstract Thes report describes the development of a new method for testing materials in hydrostatic tension using a spherical specimen of the test material bonded into the center of a cube of matrix material which has tensile loads applied to the faces of the cube. The materials are chosen such that failure first occurs in the test material, in which the stress can be estimated by elastic theory. Failure is detected from edge displacements of the cube face. While the results for brittle dental plaster have been inconclusive to date, further development of the technique appears promising.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 1968-09-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
    Publication Date: 1969-10-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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