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  • 1
    Call number: SR 90.0008(78-8)
    In: Paper
    Type of Medium: Series available for loan
    Pages: 27 S.
    ISBN: 0660100622
    Series Statement: Paper / Geological Survey of Canada 78-8
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: MOP 44026 / Mitte
    Type of Medium: Monograph available for loan
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Series available for loan
    Series available for loan
    Hanover, NH : Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory,
    Associated volumes
    Call number: ZSP-202-329
    In: Research report
    Description / Table of Contents: CONTENTS: General Introduction. - Part I. Spatial and temporal variations in sea ice deformatfon. - Introduction. - Approach. - Site location and data collection procedures. - Data analysis. - Strain results. - Comparison of mesoscale deformation with macroscale deformation. - Nature of the ice pack rotation. - Conciusion. - Literature cited. - Part Il. Comparison of mesoscale strain measurements with linear drift theory predictions. - Introduction. - List of symbols. - Linear drift equations. - Ice drift solutions. - Comparison of theory with mesoscale measurements. - A more general linear constitutive law. - Conclusions. - Literature cited. - Appendix Relative magnitudes of differential drift forces. - Abstract.
    Description / Table of Contents: Measurements of mesoscale sea ice deformation over a region approximately 20 km in diameter were made over a five-week period in the spring of 1972 at the main AIDJEX camp in the Beaufort Sea. They have been analyzed to determine nonlinearities in the ice velocity field (due to the discrete small-scale nature of the ice pack), as well as a continuum mode of deformation represented by a least squares strain rate tensor and vorticity. The deformation rate time series between Julian day 88 and 113 exhibited net areal changes as large as 3% and deformation rates up to 0.16% per hour. In the principal axis coordinate system, the strain rate typically exhibited a much larger compression (or extension) along one axis than along the other. Persistent cycles at ~12-hour wavelengths were observed in the divergence rate. A comparison of the average residual error with the average strain rate magnitude indicated that strains measured on a scale of 10 km or greater can serve as a valid measure of the continuum motion of the sea ice. This conclusion is also substantiated by a comparison between the mesoscale deformation, and macroscale deformation measured over a ~100-km-diameter region. Vorticity calculations indicate that at low temporal frequencies ( 〈 0.04 hr^-1 ) the whole mesoscale array rotates essentially as an entity and consequently the low frequency vorticity can accurately be estimated from the rotation of a single floe. (Part I) A comparison of mesoscale strain measurements with the atmospheric pressure field and the wind velocity field indicated that the ice divergence rate and vorticity followed the local pressure and wind divergence with significant correlation. For low atmospheric pressures and converging winds, the divergence rate was negative with the vorticity being counterclockwise. The inverse behavior was observed for high pressures and diverging winds. This behavior agreed with predictions based upon the infinite boundary solution of a linearized drift theory in the absence of gradient current effects and using the constitutive law proposed by Glen for pack ice. The best least squares values of the constitutive law parameters [Eta] and [Zeta] were found to be given by ~10^12 kg sec^-1. Using typical divergence rates, these values yielded compressive stresses of the magnitude of 10^5 N m^-1, which are similar to values suggested by the Parmerter and Coon ridge model. In general, the infinite boundary solution of the linear drift equation indicates that in a low pressure region that is reasonably localized in space, the ice would be expected to converge for high compactness (winter) and diverge for low compactness (summer). Calculations were also carried out using a more general linear viscoelastic constitutive law that includes memory effects and that includes a generalized Hooke's law as well as the Glen law as special cases. A best fit of this more general calculation with strain measurements indicates, overall, a better agreement with viscous behavior than with elastic behavior, with the frequency behavior of the estimated "viscosities" similar to the Glen law behavior at temporal frequencies less than ~0.01 hr^-1 (Part II)
    Type of Medium: Series available for loan
    Pages: v, 37 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 329
    Language: English
    Branch Library: AWI Library
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  • 4
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0001(1192)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: VII, 154 S. + 7 pl.
    Series Statement: U.S. Geological Survey bulletin 1192
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0001(1199-H)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: III, H-10 S. + 1 pl.
    Series Statement: U.S. Geological Survey bulletin 1199-H
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 6
    Call number: SR 90.0008(74-17)
    In: Paper
    Type of Medium: Series available for loan
    Pages: V, 44 S. + 3 pl.
    Series Statement: Paper / Geological Survey of Canada 74-17
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 7
    Call number: SR 90.0008(65-26)
    In: Paper
    Type of Medium: Series available for loan
    Pages: 11 S.
    Series Statement: Paper / Geological Survey of Canada 65-26
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 8
    Description / Table of Contents: The supercontinent-cycle hypothesis attributes planetary-scale episodic tectonic events to an intrinsic self-organizing mode of mantle convection, governed by the buoyancy of continental lithosphere that resists subduction during the closure of old ocean basins, and the consequent reorganization of mantle convection cells leading to the opening of new ocean basins. Characteristic timescales of the cycle are typically 500 to 700 million years. Proposed spatial patterns of cyclicity range from hemispheric (introversion) to antipodal (extroversion), to precisely between those end members (orthoversion). Advances in our understanding can arise from theoretical or numerical modelling, primary data acquisition relevant to continental reconstructions, and spatiotemporal correlations between plate kinematics, geodynamic events and palaeoenvironmental history. The palaeogeographic record of supercontinental tectonics on Earth is still under development. The contributions in this Special Publication provide snapshots in time of these investigations and indicate that Earth's palaeogeographic record incorporates elements of all three end-member spatial patterns.
    Pages: Online-Ressource (297 Seiten)
    ISBN: 9781862397330
    Language: English
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  • 9
    Description / Table of Contents: Microbial carbonates (microbialites) are remarkable sedimentary deposits. They have the longest geological range of any type of biogenic limestones, form in the greatest range of different sedimentary environments, oxygenated the Earth's atmosphere and produce and, furthermore, store large volumes of hydrocarbons. This Special Publication provides significant contributions at a pivotal time in our understanding of microbial carbonates when their economic importance has become established and the results of many research programmes are coming to fruition. It is the first book to focus on the economic aspects of microbialites and in particular the giant pre-salt discoveries offshore Brazil. The volume contains papers on the processes involved in the formation of both ancient and modern microbialites and the diversity of style in microbial carbonate build-ups. Structures and fabrics from both marine and non-marine settings are discussed from throughout the geological record.
    Pages: Online-Ressource (VII, 308 Seiten)
    ISBN: 9781862397279
    Language: English
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  • 10
    Monograph available for loan
    London : Geological Society
    Associated volumes
    Call number: 9/M 07.0421(455)
    In: Geological Society Special Publication
    Description / Table of Contents: Pterosaurs, the first vertebrates to evolve powered flight, are undergoing a long-running scientific renaissance that has seen sustained, and even elevated interest, from several generations of palaeontologists. These incredible reptiles are known from every continent, flew the Mesozoic skies for at least 160 million years, diversified into more than a dozen major clades and well over 100 species, and included the largest flying animals of all time. This volume brings together leading pterosaur researchers from around the globe to discuss new and cutting-edge research into various aspects of pterosaur palaeobiology and presents diverse papers to deliver new insights on flying reptile palaeoecology, flight, ontogeny, skeletal and soft-tissue anatomy, temporal and spatial distribution and evolution, as well as revisions of their taxonomy and interrelationships.
    Type of Medium: Monograph available for loan
    Pages: 238 Seiten , Illustrationen
    ISBN: 9781786203175
    Series Statement: Geological Society Special Publication 455
    URL: Cover
    Language: English
    Note: New perspectives on pterosaur palaeobiology , Pterosaurs in Mesozoic food webs: a review of fossil evidence , Using three-dimensional, digital models of pterosaur skulls for the investigation of their relative bite forces and feeding styles , Pelvic musculature of Vectidraco daisymorrisae and consequences for pterosaur locomotion , Inferring the properties of the pterosaur wing membrane , Waves of bone deposition on the rostrum of the pterosaur Pteranodon , Neonate morphology and development in pterosaurs: evidence from a Ctenochasmatid embryo from the Early Cretaceous of Argentina , Short note on a new anurognathid pterosaur with evidence of perching behaviour from Jianchang of Liaoning Province, China , Pterosaur material from the uppermost Jurassic of the uppermost Morrison Formation, Breakfast Bench Facies, Como Bluff, Wyoming, including a pterosaur with pneumatized femora , The taxonomy and phylogeny of Diopecephalus kochi (Wagner, 1837) and ‘Germanodactylus rhamphastinus’ (Wagner, 1851) , A taxonomic revision of Noripterus complicidens and Asian members of the Dsungaripteridae , Topotype specimens probably attributable to the giant azhdarchid pterosaur Arambourgiania philadelphiae (Arambourg 1959) , The pterosaur assemblage of the Oxford Clay Formation (Jurassic, Callovian–Oxfordian) from the UK , Systematic reassessment of the first Jurassic pterosaur from Thailand , A large pterodactyloid pterosaur from the Late Cretaceous Ferron Sandstone of Utah , Cervical vertebrae of an enigmatic pterosaur from the Crato Formation (Lower Cretaceous, Araripe Basin, NE Brazil) , A wing metacarpal from Italy and its implications for latest Cretaceous pterosaur diversity , A new pterosaur specimen from the Upper Tunbridge Wells Sand Formation (Cretaceous, Valanginian) of southern England and a review of Lonchodectes sagittirostris (Owen 1874) , Online version
    Location: Reading room
    Branch Library: GFZ Library
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