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  • 1
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    In:  J. Geophys. Res., Chengdu, Sichuan, China, 4, vol. 71, no. 18 , pp. 4333-4339, pp. 2027, (ISSN: 1340-4202)
    Publication Date: 1966
    Keywords: Seismology ; Nuclear explosion ; Surface waves ; JGR
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  • 2
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    In:  J. Geophys. Res., Chengdu, Sichuan, China, 4, vol. 74, no. 6, pp. 1575-1590, pp. 2027, (ISSN: 1340-4202)
    Publication Date: 1969
    Keywords: Seismology ; Nuclear explosion ; Surface waves ; JGR
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  • 3
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    Birkhäuser
    In:  Basel, 516 pp., Birkhäuser, vol. 7, no. Publ. No. 12, pp. 127, (1-4020-4233-7 (hc), 1-4020-4234-5 (sc), X + 413 p.)
    Publication Date: 1998
    Keywords: Seismology ; Anisotropy ; GeodesyY ; Plate tectonics ; Textbook of geophysics ; Babuska
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  • 4
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    In:  J. Geophys. Res., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment, University of Iceland, vol. 76, no. 11, pp. 2716-2729, pp. L05306, (ISSN: 1340-4202)
    Publication Date: 1971
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  • 5
    Publication Date: 1990-04-27
    Description: Crystals of MgSiO(3) perovskite synthesized at high pressures and temperatures have orthorhombic symmetry under ambient conditions. Examination by transmission electron microscopy shows that the microstructure of crystals synthesized at 26 gigapascals and 1600 degrees C is dominated by a large number of twin domains that are related by reflection operations with respect to {112} and {110} planes. These twins may be associated with the transformations of MgSiO(3) perovskite from the cubic to tetragonal and tetragonal to orthorhombic phases, respectively, upon decreasing pressure and temperature. These observations suggest that under the experimental synthesis conditions, and perhaps in the earth's lower mantle, the stable phase of MgSiO(3) might have the cubic perovskite structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Y -- Guyot, F -- Yeganeh-Haeri, A -- Liebermann, R C -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):468-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17815597" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 1991-01-25
    Description: Results from in situ x-ray diffraction experiments with a DIA-type cubic anvil apparatus (SAM 85) reveal that MgSiO(3) perovskite transforms from the orthorhombic Pbnm symmetry to another perovskite-type structure above 600 kelvin (K) at pressures of 7.3 gigapascals; the apparent volume increase across the transition is 0.7%. Unit-cell volume increased linearly with temperature, both below (1.44 x 10(-5) K(-1)) and above (1.55 x 10(-5) K(-1)) the transition. These results indicate that the physical properties measured on the Pbnm phase should be used with great caution because they may not be applicable to the earth's lower mantle. A density analysis based on the new data yields an iron content of 10.4 weight percent for a pyrolite composition under conditions corresponding to the lower mantle. All current equation-of-state data are compatible with constant chemical composition in the upper and lower mantle; thus, these data imply that a chemically layered mantle is unnecessary, and whole-mantle convection is possible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Y -- Weidner, D J -- Liebermann, R C -- Liu, X -- Ko, J -- Vaughan, M T -- Zhao, Y -- Yeganeh-Haeri, A -- Pacalo, R E -- New York, N.Y. -- Science. 1991 Jan 25;251(4992):410-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775105" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 1996-05-17
    Description: Ultrasonic interferometric measurements, developed for polycrystalline samples in a multi-anvil apparatus, were extended to single-crystal samples of San Carlos olivine and forsterite. The elastic moduli, C22 and C55 of San Carlos olivine and C55 of pure forsterite, were measured to about 13 gigapascals. These data on C22 for San Carlos olivine and C55 for forsterite are consistent with earlier measurements and extrapolations. The C55 for San Carlos olivine increases linearly as a function of increasing pressure, unlike the earlier nonlinear behavior observed at high pressure with impulsive stimulated scattering techniques.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen -- Li -- Liebermann -- New York, N.Y. -- Science. 1996 May 17;272(5264):979-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for High Pressure Research, Department of Earth and Space Sciences, State University of New York, Stony Brook, NY 11794, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662581" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-01-24
    Description: San Carlos olivine crystals under laboratory conditions of 26 gigapascals and 973 to 1473 kelvin (conditions typical of subducted slabs at a depth of 720 kilometers) for periods of a few minutes to 19 hours transformed to the phase assemblage of perovskite and magnesiowustite in two stages: (i) the oxygen sublattice transformed into a cubic close-packed lattice, forming a metastable spinelloid, and (ii) at higher temperatures or longer run durations, this spinelloid broke down to perovskite and magnesiowustite by redistributing silicon and magnesium while maintaining the general oxygen framework. The breakdown was characterized by a blocking temperature of 1000 kelvin, below which olivine remained metastable, and by rapid kinetics once the reaction was activated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang -- Martinez I -- Guyot -- Liebermann -- New York, N.Y. -- Science. 1997 Jan 24;275(5299):510-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for High Pressure Research and Mineral Physics Institute, State University of New York, Stony Brook, NY 11794-2100, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8999790" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1998-06-25
    Description: The cross pressure (P) and temperature (T) dependence of the elastic moduli (Cij) of single-crystal samples of periclase (MgO) from acoustic wave travel times was measured with ultrasonic interferometry: partial differential2C11/ partial differentialP partial differentialT = (-1.3 +/- 0.4) x 10(-3) per kelvin; partial differential2C110/ partial differentialP partial differentialT = (1. 7 +/- 0.7) x 10(-3) per kelvin; and partial differential2C44/ partial differentialP partial differentialT = (-0.2 +/- 0.3) x 10(-3) per kelvin. The elastic anisotropy of MgO decreases with increasing pressure at ambient temperature, but then increases as temperature is increased at high pressure. An assumption of zero cross pressure and temperature derivatives for the elastic moduli underestimates the elastic anisotropy and overestimates the acoustic velocities of MgO at the extrapolated high-pressure and high-temperature conditions of Earth's mantle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen -- Liebermann -- Weidner -- New York, N.Y. -- Science. 1998 Jun 19;280(5371):1913-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉G. Chen, Center for High Pressure Research and Mineral Physics Institute, State University of New York (SUNY), Stony Brook, NY 11794, USA. R. C. Liebermann and D. J. Weidner, Center for High Pressure Research and Department of Geoscience.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9632384" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1998-07-31
    Description: Simultaneous sound velocity measurements and x-ray diffraction studies were made on wadsleyite (beta-Mg2SiO4) to 7 gigapascals and 873 kelvin. The calculated adiabatic bulk (K) and shear (G) moduli yield K (at room conditions) = 172(2) gigapascals, dK/dP = 4.2(1), and dK/dT = -0.012(1) gigapascals per kelvin, and G (at room conditions) = 113(1) gigapascals, dG/dP = 1.5(1), and dG/dT = -0. 017(1) gigapascals per kelvin, respectively. The data imply that the P and S wave velocity contrasts between olivine and wadsleyite require an olivine amount of 38 to 39 percent in the upper mantle to satisfy the observed 410-kilometer discontinuity, but 55 to 60 percent to account for the velocity increase through the transition zone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li -- Liebermann -- Weidner -- New York, N.Y. -- Science. 1998 Jul 31;281(5377):675-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉B. Li, Center for High Pressure Research and Mineral Physics Institute, State University of New York, Stony Brook, NY 11794-2100, USA. R. C. Liebermann and D. J. Weidner, Center for High Pressure Research and Department of Geosciences, State.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9685255" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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