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  • Hanover, NH : Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory  (3)
  • Ohio  (3)
  • Hanover, NH : U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory  (2)
  • English  (8)
  • French
  • 1980-1984
  • 1965-1969  (8)
  • 1925-1929
  • 1969  (8)
  • 1
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-202-250
    In: Research report
    Description / Table of Contents: CONTENTS: Introduction. - Methods. - Results. - Ground and aerial photography. - Hemispherical photography. - Light quality. - Discussion. - Literature cited. - Abstract.
    Description / Table of Contents: Aerial and ground photographs were taken over a 2-year period of sites in the El Verde rain forest to record the consistency of the vegetational patterns in untreated sites and the changes that occurred following gamma irradiation. Four emulsions were used: panchromatic infrared, false color transparency and color transparency. Densitometry was used to evaluate color film and the vegetation response to 3 months of radiation. The color emulsions provided the sharpest indication of damage to vegetation and the succession following treatment. Hemispherical photography of the canopy was evaluated in terms of a canopy cover index defined as percent of light passing through the negative in a 90-degree cone area. Control stations were remarkably constant in all photography, establishing the stability and slow natural changes in rain forest structure. Spectral light measurements within the forest confirmed the predominance of far red shade light. Compared to similar studies on the chronic irradiated forest at Brookhaven National Laboratory the El Verde results were less distinct.
    Type of Medium: Series available for loan
    Pages: iii, 21 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 250
    Language: English
    Location: AWI Archive
    Branch Library: AWI 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-202-266
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Introduction. - Review of dielectric properties of soils and rocks. - Methods and measurements. - Introduction. - Dispersion. - Experimental procedures. - Introduction. - Apparatus. - Correction for stray fields. - Material. - Results. - The dielectric properties of Na-montmorillonite suspensions as a function of concentration. - The dielectric properties of K-montmorillonite water suspension. - Conclusions. - Outlook. - Literature cited.
    Description / Table of Contents: The dielectric properties of Na- and K- montmorillonite suspensions with concentrations varying from 2.5% to 0.10% by weight were measured at 25°C in the frequency range of 50 Hz to 20 kHz. Effects of electrode polarization were minimized by using the same stainless steel electrodes at different interelectrode distances and a correction was applied to compensate for stray fields. This investigation establishes the fact that the high dielectric constants of clay suspensions at audio frequencies are real and not the result of electrode polarization. The polarization that determines the dispersion is an interfacial phenomenon between the ionic atmosphere and the negatively charged clay particle. The results of this study show that clay suspensions have the same dispersion as soil samples, indicating the probability that the dispersion of wet soils in the frequency range from 50 Hz to 20 kHz is similar for most soils. The actual value of the dielectric constant, however, cannot yet be predicted.
    Type of Medium: Series available for loan
    Pages: iii, 17 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 266
    Language: English
    Branch Library: AWI 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-202-259
    In: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command, 259
    Description / Table of Contents: CONTENTS: Preface. - Introduction. - Previous work. - Study area. - Field procedures. - Results and discussion. - Conclusions. - Literature cited. - Abstract.
    Description / Table of Contents: A modern ice-push ridge on the northwest shore of Gardner Lake in southeastern Connecticut is 0.6 - 1.2 m high and 1.2 - 3.1 m wide. In February and March 1967, the positions of survey stakes placed on the lake ice were measured periodically. During the same period, air and ice temperature and solar radiation intensity were also recorded. Analysis of the data supports the hypothesis that thermal expansion of the lake ice rather than wind action, was the principal cause of ice push. An ice temperature change of approximately 1°C/hr increase for 6 hr was sufficient to induce ice thrust. In a 30-day period, the average net shoreward movement of the surveyed area of the ice surface was 1.0 m. During the 1966-67 winter, approximately 14 m^3 of beach material was reworked and deposited, forming a discontinuous ice-push ridge along 260 m of shoreline.
    Type of Medium: Series available for loan
    Pages: iii, 15 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 259
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
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  • 4
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-202-276
    In: Research report
    Description / Table of Contents: CONTENTS: Introduction. - Test site. - Test procedures. - Equipment. - Unconfined compression tests. - Ring tensile tests. - Test results. - Unconfined compression tests. - Ring tensile tests. - Discussion. - Literature cited. - Appendix A. Calculation of the effect of nonaxial loading of unconfined compression specimens. - Appendix B. Camp Century unconfined compressive strength data at -25C. - Appendix C. Camp Century ring-tensile strength data at -25C. - Appendix D. Unconfined compressive strength of Camp Century vertical snow samples 8.25 in. length, 3.0 in. diam at -25C. - Abstract.
    Description / Table of Contents: The unconfined compressive strengths [Sigma]c and the ring-tensile strengths [Sigma]T of snow and ice specimens from the Inclined Drift at Camp Century, Greenland, were determined. The specimen densities varied over essentially the complete natural density range of polar snow and ice (0.340 to 0.890 g/cm^3). The specimens were loaded rapidly to failure with times varying between 0.2 and 1.4 sec. During loading, head speeds varied between 5.1 and 23.6 cm/min, although during individual tests they were constant. Even the low density specimens failed in the brittle mode. Although a plot of [Sigma]T vs [Gamma] is linear, [Sigma]c vs [Gamma] is clearly nonlinear. This nonlinearity may result from either changes in the level of the internal stress concentrations associated with the voids in the snow or from changes in the ratio (bulk porosity/effective porosity of the failure surface) with density. Both tangent and secant moduli are linear functions of [Gamma]. There is no pronounced change in [Sigma]c with changes in strain rate. A significant increase in [Sigma]T, [Sigma]c and the modulus values was noted at bulk densities greater than 0.830 g/cm^3. This increase is presumably caused by the close-off of the air passages.
    Type of Medium: Series available for loan
    Pages: 35 Seiten , Illustrationen, graphische Darstellungen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 276
    Language: English
    Branch Library: AWI Library
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  • 5
    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-202-267
    In: Research report
    Description / Table of Contents: CONTENTS: Introduction. - Regional variations in density. - Monthly increase in density. - Nomograph to estimate average snow-cover density. - Test and application of the nomograph. - Discussion. - Literature cited. - Appendix A: Observed, weighted snow-cover densities for stations in Table 1.
    Description / Table of Contents: Analysis of snow-cover observations made during November - March at 27 stations in Alaska, Canada and the northern United States for a 2 to 11 year period showed that the average snow density can be classified in four general categories: Category 1 (density 0.20 to 0.23 g/cm^3 ), inland stations reporting light winds; Category 2 (0.24 to 0.27 g/cm^3), stations reporting moderate winds; Category 3 (0.28 to 0.30 g/cm^3), inland and coastal locations with stronger winds; Category 4 (0.32 to 0.36 g/cm^3), cold and windy stations of the Arctic. Skewness coefficients computed for each station showed bias toward lower densities for cat. 1 and 2, and bias toward higher densities for cat. 3 and 4. A nomograph in which the average winter air temperature and wind speed are the independent variables makes it possible to estimate the average snow-cover density for any location in the Arctic, subarctic and North Temperate Zones. A comparison between observed and estimated densities for ten other test stations yielded a correlation coefficient of 0.91 with a standard error of estimate of 0.016 g/cm^3. An average snow density map of North America was drawn and the continent was divided into areas based on the four categories.
    Type of Medium: Series available for loan
    Pages: iii, 21 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 267
    Language: English
    Branch Library: AWI Library
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  • 6
    Call number: SR 90.0081(126)
    In: Reports of the Department of Geodetic Science and Surveying
    Type of Medium: Series available for loan
    Pages: IV, 56 S.
    Series Statement: Report / Department of Geodetic Science, the Ohio State University 126
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 7
    Call number: SR 90.0081(109)
    In: Reports of the Department of Geodetic Science and Surveying
    Type of Medium: Series available for loan
    Pages: II, 16 S.
    Series Statement: Report / Department of Geodetic Science, the Ohio State University 109
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 8
    Call number: SR 90.0081(125)
    In: Reports of the Department of Geodetic Science and Surveying
    Type of Medium: Series available for loan
    Pages: IV, 37 S.
    Series Statement: Report / Department of Geodetic Science, the Ohio State University 125
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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