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  • English  (318)
  • German  (12)
  • 2005-2009  (190)
  • 1975-1979  (140)
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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
    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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  • 3
    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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  • 4
    Unknown
    Amsterdam ; Boston : Elsevier
    Keywords: DDC 514.74 ; LC QA614 ; Global analysis (Mathematics) ; Mathematical physics
    Pages: Online-Ressource (xii, 1229 pages)
    Edition: 1st ed
    ISBN: 9780444528339
    Language: English
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  • 5
    Description / Table of Contents: The Palaeoproterozoic era (2500–1600 Ma) was a critical period of Earth history, with dynamic evolution from the deep planetary interior to its surface environment. Several lines of geological evidence suggest the existence of at least one pre-Rodinia supercontinent, named Nuna or Columbia, which formed near the end of Palaeoproterozoic time. Prior to this assembly, there may have been an older supercontinent (Kenorland) or perhaps only independently drifting supercratons. The tectonic records of amalgamation and dispersal of these ancient landmasses provide a framework that links processes of the deep Earth with those of its fluid envelope. The sixteen papers in this volume present reviews and new analytical data that span the geological record of Palaeoproterozoic Earth and provide a current picture of Palaeoproterozoic research. The volume provides a useful reference book for students and professional geoscientists interested in this important period of global evolution.
    Pages: Online-Ressource (362 Seiten)
    ISBN: 9781862392830
    Language: English
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  • 6
    Series available for loan
    Series available for loan
    Hanover, N.H. : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-202-350
    In: Research report / Cold Regions Research and Engineering Laboratory, 350
    Type of Medium: Series available for loan
    Pages: iv, 27 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 350
    Language: English
    Note: CONTENTS: Abstract. - Preface. - Introduction. - Sample preparation. - Apparatus and testing procedure. - Test results. - Uniaxial strength. - Initial tangent and 50% strength moduli. - Specific energy. - Discussion. - Testing method. - Compressive strength. - Tensile strength. - Ductile and brittle fracture.. - Initial tangent and 50% stress moduli. - Specific energy. - Conclusions and recommendations. - References. - Appendix A: Description of soil and calculations. - Appendix B: Description of the LVDT and averaging circuits. - Appendix C: Determination of strain in the neck section of a dumbbell specimen.
    Location: AWI Archive
    Branch Library: AWI Library
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  • 7
    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-202-333
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Introduction. - Analogy method. - Method based on the bending theory of elastic plates and the criterion [Sigma]max = [Sigma]f. - Methods based on viscoelastic theories. - Methods based on the yield line theory or limit analysis. - Comparison of analytical and test results. - General remarks. - Effect of bending and shearing forces on deflection of an ice cover. - Determination of Pf(O). - Determination of Pf(t). - Determination of [Sigma]f. - Summary and recommendations. - Literature cited.
    Description / Table of Contents: This report contains a critical survey of the literature on the bearing capacity of floating ice plates. It consists of a discussion of general questions, a critical survey of analytical attempts to determine the bearing capacity of floating ice plates, and a survey of field and laboratory tests on floating ice plates and their relation to the analytical results. The paper concludes with a systematic summary of the results, a discussion of observed shortcomings, and suggestions for needed investigations.
    Type of Medium: Series available for loan
    Pages: iv, 43 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 333
    Language: English
    Branch Library: AWI Library
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  • 8
    Call number: SR 90.0001(1405-B)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: IV, B-20 S.
    Series Statement: U.S. Geological Survey bulletin 1405-B
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 9
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0001(1433)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: IV, 41 S. + 1 pl.
    Series Statement: U.S. Geological Survey bulletin 1433
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 10
    Call number: SR 90.0001(1417)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: III, 78 S.
    Series Statement: U.S. Geological Survey bulletin 1417
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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