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  • American Institute of Physics (AIP)  (2)
  • American Association for the Advancement of Science (AAAS)  (1)
  • 1995-1999  (3)
  • 1999  (3)
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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced charge transport processes in photorefractive Ba0.77Ca0.23TiO3 doped with iron (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6751-6757 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photorefractive barium-calcium titanate crystals with the congruently melting composition (Ba0.77Ca0.23TiO3) doped with iron are annealed in a hydrogen atmosphere at various temperatures. The samples are studied with electron paramagnetic resonance (EPR) and optical absorption, both performed separately as well as simultaneously, before and after illumination. The reduced samples are electron conductive and the charge transport at room temperature is governed by only one level identified by photo-EPR as Fe2+/3+. The optical absorption of Fe2+ is found to be peaked at 1.9 eV. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370189
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dislocation core reconstruction and its effect on dislocation mobility in silicon (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4249-4257 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Through atomistic calculations of kink nucleation and migration in the core of partial dislocations in silicon we demonstrate that symmetry-breaking structural reconstructions will strongly affect dislocation mobility. Core reconstructions give rise to multiple kink species, and, relative to kinks in an unreconstructed dislocation, an increase in kink formation and migration energies. These factors provide additional resistance to dislocation motion which scales with the energy reconstruction. Our results indicate that the observed variations of dislocation mobility in going from elemental to IV–IV, and further to III–V and II–VI zinc-blende semiconductors, can be attributed in part to the weakening of core reconstruction across the series. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371353
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  • 3
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    Wing rotation and the aerodynamic basis of insect flight (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-18
    Description: The enhanced aerodynamic performance of insects results from an interaction of three distinct yet interactive mechanisms: delayed stall, rotational circulation, and wake capture. Delayed stall functions during the translational portions of the stroke, when the wings sweep through the air with a large angle of attack. In contrast, rotational circulation and wake capture generate aerodynamic forces during stroke reversals, when the wings rapidly rotate and change direction. In addition to contributing to the lift required to keep an insect aloft, these two rotational mechanisms provide a potent means by which the animal can modulate the direction and magnitude of flight forces during steering maneuvers. A comprehensive theory incorporating both translational and rotational mechanisms may explain the diverse patterns of wing motion displayed by different species of insects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dickinson, M H -- Lehmann, F O -- Sane, S P -- New York, N.Y. -- Science. 1999 Jun 18;284(5422):1954-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Integrative Biology, University of California, Berkeley, CA 94720, USA. flymannd@socrates.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10373107" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomechanical Phenomena ; Drosophila melanogaster/*physiology ; Flight, Animal/*physiology ; Kinetics ; Models, Biological ; Movement ; Robotics ; Rotation ; Wings, Animal/*physiology
    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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