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  • 1
    Series available for loan
    Series available for loan
    Wilmette, Ill. : Snow Ice and Permafrost Research Establishment, Corps of Engineers, U.S. Army
    Associated volumes
    Call number: ZSP-202-53
    In: Research report / Cold Regions Research and Engineering Laboratory, 53
    Description / Table of Contents: Summary: The results of investigations on the structural changes of Greenland snow during age-hardening in the first 49 hr after ejection by a Peter snow miller from a trench 4.7 ft deep are reported, and the method of study is described. The samples of snow were taken at various distances from the trench 1, 3, 14, 25, and 49 hr after deposition, and their changes were studied as a function of time and distance from the trench. The porosity remained constant at an average of 50 ± 3%. The number of grains/cm^2 decreased with time and increased with distance from the trench because of the different speeds of sedimentation and wind sifting. The mean grain cross-section showed a similar dependence. The relative length of grain boundaries increased with time and slightly with distance from the trench, while the mean length of new grain-to-grain boundaries increased with age and decreased with distance from the trench. The mean number of adjacent grains per grain vs. relative length of grain boundaries showed a linear relation. A slight increase of new boundaries with increasing number of neighbors was also observed. Suggestions for a precise study of the age-hardening process of snow are made.
    Type of Medium: Series available for loan
    Pages: v, 15, A5 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 53
    Language: English
    Note: CONTENTS Preface Summary Methods of testing Sampling Preparation of samples Preparation of structure pictures Results Influence of time and place Porosity Number of grains/cm2 Mean grain cross section Relative length of grain boundaries (KM ratio) Mean number of adjacent grains per grain Number of new boundaries/cm 2 Mean length of new grain-to-grain boundaries Some interrelations of the structure data Structure of a 1-yr old Peter snow Suggestions for an exact study of the age-hardening process of snow References Appendix: Structure pictures
    Location: AWI Archive
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Wilmette, Ill. : Snow Ice and Permafrost Research Establishment, Corps of Engineers, U.S. Army
    Associated volumes
    Call number: ZSP-202-42
    In: Research report / Cold Regions Research and Engineering Laboratory, 42
    Description / Table of Contents: Summary: The results of petrofabric studies in the laboratory on five samples of high-density snow collected in 1954 and 1955 at depths of 8.0, 15.5, 23.0, 34.2, and 46.3 m in a pit at Site 2 are reported. The porosity of the samples, the number of grains/cm^2, the mean number of adjacent grains per grain, the mean grain cross section, the size distribution of grain cross sections, and the orientation of c-axes were determined from enlarged photomicrographs of thin sections, using reflected light and transmitted polarized light. The number of adjacent grains per grain, the ratio of free to occupied grain surface, and the sphericity clearly depended on porosity and on each other. There was no strong relation between these data and the number of grains/cm^2. Hence, the structure of high density snow can be satisfactorily described by the porosity and the number of grains/cm^2 . Conclusions from a two-dimensional thin section can be applied to a spatial sample only if the sample is isotropic by strata.
    Type of Medium: Series available for loan
    Pages: iv, 24 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 42
    Language: English
    Note: CONTENTS Page Preface Summary Introduction Methods of preparation Measurements of structural properties Measurements on homogeneity and isotropy Results Structure data Orientation of c-axes Analysis of the distribution of the orientation of c-axes Preferred directions of the fabric Distribution of grain cross sections Size and shape of the counting areas Interrelations of the structure, data Conclusions Recommendations for further studies References
    Location: AWI Archive
    Branch Library: AWI Library
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 4 (1954), S. 193-202 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1954-01-01
    Print ISSN: 0041-3763
    Electronic ISSN: 1438-1168
    Topics: Geosciences
    Published by Springer
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