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  • 1
    Electronic Resource
    Electronic Resource
    Motion parallax is used to control postural sway during walking (1996)
    Springer
    Experimental brain research 111 (1996), S. 271-282 
    Details
    ISSN: 1432-1106
    Keywords: Balance ; Locomotion ; Motion parallax ; Postural control and sway ; Vision ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Three experiments tested the hypothesis that postural sway during locomotion is visually regulated by motion parallax as well as optical expansion. Oscillating displays of three-dimensional scenes were presented to participants walking on a treadmill, while postural sway was recorded. Displays simulated: (a) a cloud, in which parallax and expansion are congruent, (b) a hallway, (c) the side walls of the hallway, (d) a ground surface, (e) a wall, (f) the wall with a central hole, (g) a hall farther from the observer, and (h) a wall farther from the observer. In contrast to previous results with a hallway, responses with the cloud were isotropic and directionally specific. The other displays demonstrated that motion parallax was more effective than simple horizontal flow in eliciting lateral sway. These results are consistent with the hypothesis that adaptive control of sway during walking is based on congruent expansion and parallax in natural environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227304
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  • 2
    Electronic Resource
    Electronic Resource
    Aerial Remote Sensing of Carbonate Terranes in Shelby County, Alabama (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 11 (1973), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Remotely-sensed data are being used by the Geological Survey of Alabama in the study of subsidence and collapse problems in several carbonate terranes. Active areas in Shelby County, Alabama, have been delineated by on-the-ground inspection and by use of airborne remote sensors. These active terranes present formidable problems to those who presently live in the area as well as to those who will be involved in the future development of this region; therefore, techniques must be found that can be used to predict subsidence and collapse.Study of a 70-square-mile test area in the county indicates that aerial infrared photography, thermography, and side-looking airborne radar (SLAR) imagery can be used for (1) locating, inventorying, and monitoring sinkholes; (2) predicting potential collapses; (3) mapping fracture traces, lineaments, regional geologic structure, and alignment of sinkholes; and (4) assisting general project planning. Tremendous time and effort can be saved by using remote-sensing techniques because large areas can be examined in a very short period of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1973.tb02988.x
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  • 3
    Electronic Resource
    Electronic Resource
    RETENTION BASIN FAILURES IN CARBONATE TERRANES (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 10 (1974), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Sinkholes and subsidence in areas subject to dewatering of carbonate formations have been documented in several geologic and hydrologic investigations. Excessive ground-water pumpage has been cited as a causative factor in areas of increased sinkhole activity. Subsurface erosion of unconsolidated materials underlain by carbonate rocks is one cause of the collapses. Infiltrating water from retention basins may cause subsurface erosion and eventual failure by collapse of the structure. The resulting ground-water contamination would be great as the pollutants spread throughout the solution-cavity system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1974.tb00537.x
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  • 4
    Electronic Resource
    Electronic Resource
    A serine/threonine kinase gene defective in Peutz–Jeghers syndrome (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 184-187 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Studies of hereditary cancer syndromes have contributed greatly to our understanding of molecular events involved in tumorigenesis. Here we investigate the molecular background of the Peutz–Jeghers syndrome, (PJS), a rare hereditary disease in which there is predisposition to benign and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/34432
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  • 5
    Electronic Resource
    Electronic Resource
    Observation of two charge states of ruthenium in PbTiO3 single crystals (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5865-5868 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two charge states are observed for Ru in doped PbTiO3 crystals using electron paramagnetic resonance (EPR). The two paramagnetic charge states are +3 and +5. The g tensors for the Ru3+ and Ru5+ defects were found to be near axial: g(parallel)(approximately-equal-to)1.155 and g⊥(approximately-equal-to)2.188 for the Ru3+ center and ge(parallel)(approximately-equal-to)2.0045 and ge⊥(approximately-equal-to)3.959 for the Ru5+ center. Analysis of the EPR spectra by crystal field theory indicates that the Ru3+ ions are in tetragonally distorted (elongated) octahedral sites, strongly suggesting that they substitute for the central Ti4+ ions in the perovskite lattice. Analysis of the Ru5+ EPR spectra indicate that this defect is also in an octahedral site with a very large zero field splitting parameter. The results suggest that both Ru3+ and Ru5+ can substitute for Ti4+ in the perovskite lattice with self-compensation. Last, it is found that optical illumination of the crystals with band-gap light at low temperatures decreases the density of both Ru centers. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359167
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  • 6
    Electronic Resource
    Electronic Resource
    Carbonization of Coal Evaluation of Effects of Rate of Heating and of Maximum Temperature on Pyrolysis of a Coking Coal (1935)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 27 (1935), S. 72-77 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50301a017
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  • 7
    Electronic Resource
    Electronic Resource
    Carbonization of Coal Effects of Variation of Rate of Heating during the Carbonization of a Typical Coking Coal (1935)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 27 (1935), S. 1350-1354 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50311a029
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  • 8
    Electronic Resource
    Electronic Resource
    Structural identification of the silicon and nitrogen dangling-bond centers in amorphous silicon nitride (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 346-354 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the observation of both silicon and nitrogen paramagnetic defect centers using X-band and Q-band electron spin resonance microwave excitation frequencies. By using two different microwave frequencies along with a computer analysis of the resonance lineshapes, we have been able to confirm and extend earlier observations regarding the chemical identity of these paramagnetic defects. Specifically, we provide additional evidence that the silicon dangling bond, i.e., K center, is an unpaired electron on a silicon atom bonded to three nitrogen atoms in stoichiometric silicon nitride. We further demonstrate that the g tensor of the K center exhibits very little anisotropy and that the lineshape is broadened primarily by hyperfine interactions of the nitrogens bonded to the silicon atom. We also confirm that the recently observed nitrogen dangling-bond resonance in silicon nitride is indeed due to a hyperfine interaction with a nitrogen nucleus. This improved understanding of these two important paramagnetic defects may be of importance in eliminating or perhaps exploiting their chemical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350280
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  • 9
    Electronic Resource
    Electronic Resource
    Fundamental differences between thick and thin oxides subjected to high electric fields (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4305-4308 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We observe atomic scale differences in the response of thin and thick oxides subjected to high electric fields. In stressed thick oxides, we observe the generation of a "trivalent silicon'' trapped hole center, termed E'; in stressed thin oxides no E' centers were detected. We believe that our results indicate the absence of impact ionization in stressed thin oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339110
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  • 10
    Electronic Resource
    Electronic Resource
    Shallow Pb3+ hole traps in lead zirconate titanate ferroelectrics (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1519-1521 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A combination of electron paramagnetic resonance and band structure calculations is used to show that the Pb2+ ions in lead zirconate titanate materials can act as shallow hole traps to give Pb3+ centers. The Pb3+ centers are created by optical illumination and are found to be metastable at room temperature. Their decay kinetics follow a stretched exponential function which suggests dispersive transport. The traps have the same character as the upper valence band which is formed from the hybridization of Pb s and O p states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110761
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