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  • 1
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    Seismic evidence for a lower-mantle origin of the Iceland plume (1998)
    In:  Nature, Luxembourg, Inst. Electrical & Electronics Engineers, vol. 395, no. 6697, pp. 62-65, pp. B06303, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Seismology ; hot ; spot ; Plate tectonics ; Surface waves ; Tomography ; Dispersion
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Climate change record in subsurface temperatures: A global perspective (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-09
    Description: Analyses of underground temperature measurements from 358 boreholes in eastern North America, central Europe, southern Africa, and Australia indicate that, in the 20th century, the average surface temperature of Earth has increased by about 0.5 degreesC and that the 20th century has been the warmest of the past five centuries. The subsurface temperatures also indicate that Earth's mean surface temperature has increased by about 1.0 degreesC over the past five centuries. The geothermal data offer an independent confirmation of the unusual character of 20th-century climate that has emerged from recent multiproxy studies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pollack -- Huang -- Shen -- New York, N.Y. -- Science. 1998 Oct 9;282(5387):279-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉H. N. Pollack and S. Huang, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA. P.-Y. Shen, Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9765150" 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
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Mantle discontinuity structure beneath the southern east pacific rise from P-to-S converted phases (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-05
    Description: Receiver functions derived from teleseismic body waves recorded by ocean-bottom seismometers on the southern East Pacific Rise reveal shear waves converted from compressional waves at the mantle discontinuities near 410- and 660-kilometer depth. The thickness of the mantle transition zone between the two discontinuities is normal relative to the global average and indicates that upwelling beneath the southern East Pacific Rise is not associated with an excess temperature in the mantle transition zone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shen -- Sheehan -- Dueker -- de Groot-Hedlin C -- Gilbert -- New York, N.Y. -- Science. 1998 May 22;280(5367):1232-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Y. Shen, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. A. F. Sheehan, K. G. Dueker, H. Gilbert, Cooperative Institute for Research in Environmental Sciences (CIRES), University of.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596570" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Phase velocities of rayleigh waves in the MELT experiment on the east pacific rise (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-05
    Description: The phase velocities of Rayleigh waves increase more rapidly with distance from the East Pacific Rise (EPR) axis than is predicted by models of conductive cooling of the lithosphere. Low velocities near the axis are probably caused by partial melt at depths of 20 to 70 kilometers in a zone several hundred kilometers wide. The lowest velocities are offset to the west of the EPR. Wave propagation is anisotropic; the fast direction is approximately perpendicular to the ridge, parallel to the spreading direction. Anisotropy increases from a minimum near the axis to 3 percent or more on the flanks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forsyth -- Webb -- Dorman -- Shen -- New York, N.Y. -- Science. 1998 May 22;280(5367):1235-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉D. W. Forsyth, Department of Geological Sciences, Brown University, Providence, RI 02912, USA. S. C. Webb and L. M. Dorman, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. Y. Shen, Woods Hole Ocea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596571" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    A population genetic test of selection at the molecular level (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-12-01
    Description: The role of natural selection in molecular evolution has been inferred primarily by rejection of null hypotheses based on neutral theory, rather than by acceptance of specific predictions based on selection. In this report, a population genetic test of a specific prediction for selection on DNA polymorphism is presented. Pyrethroid insecticide use constitutes an experiment for which form of selection and molecular target (voltage-gated sodium channels) are both known. As predicted, differential pyrethroid selection on tobacco budworm populations generated significant geographic heterogeneity in sodium channel marker allele frequencies, compared with arbitrary loci.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor, M F -- Shen, Y -- Kreitman, M E -- New York, N.Y. -- Science. 1995 Dec 1;270(5241):1497-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Entomology, Center for Insect Science, University of Arizona, Tucson 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7491497" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Base Sequence ; *Evolution, Molecular ; *Genes, Insect ; Genetic Markers ; Insecticide Resistance ; Insecticides/pharmacology ; Male ; Molecular Sequence Data ; Moths/*genetics ; Polymorphism, Genetic ; Pyrethrins/pharmacology ; *Selection, Genetic ; Sodium Channels/*genetics ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 6
    Electronic Resource
    Electronic Resource
    Photoacoustic investigation of resonance absorption on corrugated surfaces (1996)
    Springer
    Applied physics 62 (1996), S. 263-268 
    Details
    ISSN: 1432-0630
    Keywords: 78.20. — e ; 41.20. — q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The PhotoAcoustic (PA) method has been used to study the optical resonance absorptions on corrugated surfaces. The resonance absorptions due to the excitations of surface plasmons and guide-waves of corrugated surfaces have been measured experimentally, and the effects of the groove depth and period of the corrugated surface on the absorption curve have been observed. Moreover, the differential method based on the rigorous use of electromagnetic theory is used to calculate the parameters of the grooves and the optical absorptivities of the samples. The theoretical results on the resonance absorption peaks are in good agreement with those of the PA experiments. Then, the parameters of the grooves can be estimated by the PA investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575092
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Excitation of higher harmonics in transient laser gratings by an ablative mechanism (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1640-1642 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser-induced transient gratings were excited at the surface of an aluminum film by picosecond laser pulses. The counterpropagating surface acoustic waves with a fundamental frequency of 70 MHz that were launched were monitored outside the source region by laser probe beam deflection. The second and third harmonics were observed for ablative interaction of the laser radiation with the aluminum surface. A simple model is presented that describes the effects on the basis of nonlinear photoacoustic signal generation at the source due to a nonsinusoidal driving force. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122231
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  • 8
    Electronic Resource
    Electronic Resource
    Large change of the giant magnetoresistance behavior after changing the spacer from Cu to CuMn alloy in Co/spacer/Co structures (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5030-5032 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The giant magnetoresistance (GMR) effects in sandwiched Co/Cu/Co and Co/CuMn/Co structures have been investigated. The GMR oscillates with the spacer thickness for both cases, but is nearly antiphased. With diluted Mn atoms in the Cu spacer, the GMR curve as a function of the magnetic field changes a lot, and the saturation/switching field for GMR can be reduced greatly compared with that in Co/Cu/Co systems. This may indicate one way to obtain a highly sensitive GMR. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370081
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of hydrogen-terminated Si(111) surfaces by sum-frequency surface vibrational spectroscopy (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3357-3359 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sum-frequency surface vibrational spectroscopy was used to characterize H-terminated Si(111) surfaces prepared by different methods. It was found that flash heating of a sample to 1500 K followed by H2 dosing at 900 K yields a surface as good in quality as a wet chemically treated surface. Both surfaces are far superior than that prepared by atomic H adsorption. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125350
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  • 10
    Electronic Resource
    Electronic Resource
    Oxygen-induced amorphous structure of tungsten thin films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2211-2213 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A combination of energy-filtered electron diffraction, electron energy-loss spectroscopy, transmission electron microscopy, and x-ray diffraction are used to establish that oxygen impurities incorporated in tungsten films prepared by magnetron sputtering in the early stage of the deposition play a dominant role in the formation of an amorphous phase. Energy-filtered electron diffraction data collected from a range of amorphous films were Fourier transformed to a reduced density function (RDF) and matched with an amorphous model. The results show that better agreement with the experimental RDF is achieved if the amorphous model consists of a random continuous matrix of clusters with W3O-like symmetry. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124967
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