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  • 1975-1979  (84,780)
  • 1950-1954  (12,162)
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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
    Monograph available for loan
    Monograph available for loan
    Berlin : Verl. Technik
    Call number: O 2559
    Type of Medium: Monograph available for loan
    Pages: 251 S.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 4
    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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  • 5
    Monograph available for loan
    Monograph available for loan
    WASHINGTON,D.C. : ENVIRONMENTAL DATA SERVICE
    Call number: MOP 43951 / Mitte
    Type of Medium: Monograph available for loan
    Pages: II, 47 S.
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 6
    Monograph available for loan
    Monograph available for loan
    Helsinki : Suomalainen Tiedeakatemia
    Associated volumes
    Call number: AWI G3-99-0042
    In: Annales Academiae Scientiarum Fennicae
    Type of Medium: Monograph available for loan
    Pages: 71 S. : Ill.
    ISBN: 9514103084
    Series Statement: Annales Academiae Scientiarum Fennicae : A 127
    Branch Library: AWI Library
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  • 7
    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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  • 8
    Monograph available for loan
    Monograph available for loan
    Washington, DC : Center for Experiment Design and Data Analysis, Environmental Data Service
    Associated volumes
    Call number: MOP Per 334/A(13)
    In: NOAA technical report
    Type of Medium: Monograph available for loan
    Pages: IV, 40 S.
    Series Statement: NOAA technical report : EDS 13
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 9
    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-202-334
    In: Research report
    Description / Table of Contents: CONTENTS: Abstract. - Preface. - List of symbols and associated dimensions. - Introduction and purpose. - Site characteristics. - Outline of study scheme. - Analysis. - Heat conduction to the drill hole. - Heat transfer between conduit wall and coolant. - Heat transfer between surface pipe and air. - Total heat extraction process. - Example calculations. - Estimate of basal water thickness and flow rates. - Summary of investigations of multiple-hole. - Literature cited.
    Description / Table of Contents: A scheme for cooling the lower portion of the edge of the Greenland ice sheet, which abuts a potential mining operation, is examined. The magnitude of cooling which may be accomplished by drilling a series of holes about the periphery of the mine site is determined as a function of hole size, spacing and time. Refrigeration is accomplished by pumping a coolant downhole in a central pipe, then uphole in an annulus between the pipe and hole wall, and then through a thin-walled pipe exposed to the surface climate above the ice sheet. It was found possible to achieve a temperature change in the ice of the order of -1°C with hole spacings and pumping requirements which are considered reasonable. Other effects are briefly examined and include an estimate of the basal water thickness and flow rates.
    Type of Medium: Series available for loan
    Pages: vii, 19 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 334
    Language: English
    Branch Library: AWI Library
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  • 10
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0001(1009-A)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: III, 12 S. + 1 pl.
    Series Statement: U.S. Geological Survey bulletin 1009-A
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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