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  • Chemical Engineering
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  • Physics
  • 2000-2004  (4)
  • 1980-1984
  • 1945-1949
  • 2002  (4)
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  • 2000-2004  (4)
  • 1980-1984
  • 1945-1949
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  • 1
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    Unbekannt
    In:  J. Geophys. Res., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 107, no. B10, pp. ECV 6-1-ECV 6-17, pp. 2223, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publikationsdatum: 2002
    Beschreibung: We use laboratory experiments and numerical models to quantify the effects of dike interaction on the focusing of magma as it ascends in the upper mantle. Laboratory experiments involve injecting buoyant fluid into the base of a tank filled with solidified gelatin. When we initiate two dikes parallel to each other, but separated by a horizontal distance x, they tend to merge as they ascend. This behavior is also predicted by numerical models of two-dimensional dikes. The key parameters that control the maximum horizontal separation x c over which dikes will intersect are dike driving pressures, dike head lengths L (i.e., the length over which driving pressure is large), and the difference between the principal stresses of the remote stress field. When the remote differential stress is small compared to the dike driving pressure, two dikes of equal driving pressure and length will intersect over distances of x c ? L. This distance decreases with increasing remote differential stress. We quantify the effects on magma transport from a broad lateral distribution of magma using numerical simulations of multiple-dike interaction. When the average dike spacing prior to interaction is within ?3 L and remote differential stresses are insignificant, dike interaction can focus magma over horizontal distances many times L but at least ?6 L. Dike interaction can focus magma in the asthenosphere beneath mid-ocean ridges for low mantle viscosities (?10 19 Pa s) and if dikes initiate with average separations of a few hundred meters, or less. Such focusing is predicted to grow dikes of increasing magma flux approaching lateral separations of a kilometer.
    Schlagwort(e): Fluids ; Plate tectonics ; ascent ; sheeted ; dykes ; Modelling ; JGR ; 8434 ; Volcanology: ; Magma ; migration ; 8145 ; Tectonophysics: ; Physics ; of ; magma ; and ; magma ; bodies ; 8120 ; Dynamics ; of ; lithosphere ; and ; mantle--general ; 3035 ; Marine ; Geology ; and ; Geophysics: ; Midocean ; ridge ; processes
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2002-10-09
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Radny, Marian W -- New York, N.Y. -- Science. 2002 Oct 4;298(5591):59; author reply 59.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12365438" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Body Constitution ; Body Weight ; *Carnivora/anatomy & histology/metabolism ; *Ecosystem ; *Food ; Physical Phenomena ; Physics ; Population Density
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2002-03-16
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eisner, Thomas -- Berenbaum, May -- New York, N.Y. -- Science. 2002 Mar 15;295(5562):1973.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11896239" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biochemical Phenomena ; *Biochemistry ; *Biological Factors/chemistry ; *Biology ; Chemical Phenomena ; Chemistry ; *Ecology ; Ecosystem ; *Molecular Biology ; Research Support as Topic ; United States
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2002-03-30
    Beschreibung: Beyond molecular chemistry based on the covalent bond, supramolecular chemistry aims at developing highly complex chemical systems from components interacting through noncovalent intermolecular forces. Over the past quarter century, supramolecular chemistry has grown into a major field and has fueled numerous developments at the interfaces with biology and physics. Some of the conceptual advances and future challenges are profiled here.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lehn, Jean-Marie -- New York, N.Y. -- Science. 2002 Mar 29;295(5564):2400-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Science et d'Ingenierie Supramoleculaires (ISIS), Universite Louis Pasteur, 67000 Strasbourg, and College de France, 75005 Paris, France. lehn@chimie.u-strasbg.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11923524" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Biology ; Chemical Phenomena ; *Chemistry ; Chemistry, Physical ; Molecular Structure ; Nanotechnology ; Physical Phenomena ; Physicochemical Phenomena ; Physics ; *Polymers/chemistry
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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