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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-202-69
    In: Research report / Cold Regions Research and Engineering Laboratory, 69
    Description / Table of Contents: Summary: The relations between rate of snow accumulation, snow density, snow age, and depth below the surface are formulated in terms of a compactive viscosity factor, which is assumed to be a function of only density and temperature, with parameters which will vary with the snow-type sequences of different climatic areas of high polar glaciers. The theory could be useful in an analysis of the data obtained from the large number of snow pits in Greenland, Ellesmere Island,and Antarctica.
    Type of Medium: Series available for loan
    Pages: iv, 8 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 69
    Language: English
    Note: CONTENTS Preface Summary Introduction The Sorge depth-density curve Generalization for time-variable rate of accumulation Path of a particle on the surface y=B(h,t) Effect of temperature Computational procedure Densification under high loads References
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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-202-66
    In: Research report / Cold Regions Research and Engineering Laboratory, 66
    Description / Table of Contents: Summary: A simple theory is proposed for crack formation and development by soil desiccation on the basis of laboratory experiments utilizing soil samples (Bloomington till) with max particle size of 1 mm diam. held in flat wooden containers. The crack pattern is more dependent on the thickness of the soil sample than on temperature or humidity. Some effect is caused also by differences in the bottom material of the containers. The area of cells made by crack patterns has a log normal size distribution. Total length of cracks decreases with increase in sample thickness. The number of sides of cells also depends on the thickness. Cracking was found to begin from the center of the soil layer and to propagate to the surface or bottom with non-uniform speed.
    Type of Medium: Series available for loan
    Pages: vi, 48, A4 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 66
    Language: English
    Note: CONTENTS Preface Summary Introduction Soil material Soil Preparation of the soil material Containers Temperature and humidity of the air Moisture content and dry density of the soil Experimental procedures and results General procedures Definition of the characteristics of cracking of soil Cracking moisture content Size of cells made by cracking of the soil Length of cracks Number of sides of cells Development of cracks Additional experiments Interfacial fracture markings Method of auxilliary tests on physical properties of the soil Elastic constants of the soil Shrinkage of soil due to desiccation Tests of the adhesion between the soil and the bottom material Results of auxiliary tests Elastic constants of the soil Free shrinkage process of the soil due to desiccation Adhesion between the soil and glass or wood Mechanism of crack formation due to the desiccation of soil Geometric interpretation Mechanical interpretation Conclusions References Appendix: Table of experiments
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  • 3
    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-202-60
    In: Research report / Cold Regions Research and Engineering Laboratory, 60
    Description / Table of Contents: Summary: This report presents numerical results on the feasibility study of the use of in-ice cooling for a power plant. As a result of this type of arrangement, a water pond under ice is formed. The pond size as a function of time for various operating conditions has been computed. The associated problems such as water temperature, power consumption, etc., are also studied.
    Type of Medium: Series available for loan
    Pages: iv, 17, A6 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 60
    Language: English
    Note: CONTENTS Preface Summary Introduction Open-loop system Method of analysis Time dependence of pond size Temperature of water in the pond Effect of inlet water temperature Effect of convection duct Power consumption for circulation of cooling water Condlusions Closed-loop system Method of analysis Time dependence of pond size Flow conditions of glycol solutions inside coil Discussion and conclusions References Appendix: Examples of calculations
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  • 4
    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-202-59
    In: Research report / Cold Regions Research and Engineering Laboratory, 59
    Description / Table of Contents: Summary: The deflection expression of an infinite plate subjected to a concentrated force is used with the "method of images" to obtain solutions for 6 plates with simply supported edges. The semi-infinite plate, the wedge-shaped plate, and its special case, the rectangular corner plate, are solved in closed form; and the infinite strip, the semi-infinite strip, and the rectangular plate are solved as rapidly convergent series. Behavior under a concentrated force is studied in more detail for the semi-infinite plate and the rectangular corner plate. Relationships for obtaining bending moments, shear forces and reaction distributions as well as derivatives of the kei-function with respect to 𝗋 and 𝛳 are given in the appendices.
    Type of Medium: Series available for loan
    Pages: iv, 12, [2] Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 59
    Language: English
    Note: CONTENTS Preface Introduction and statement of the problem Solution of the boundary value problems for simply supported boundaries Semi-infinite plate Wedge-shaped plate Rectangular corner plate Infinite strip Semi-infinite strip Rectangular plate Remarks on the problem of arbitrary load distribution References Appendix A Appendix B
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  • 5
    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-202-61
    In: Research report / Cold Regions Research and Engineering Laboratory, 61
    Description / Table of Contents: Summary: The results of experiments on the bonding of polished and microtomed surfaces of bubble-free ice samples at -5°C with various loads are reported. Only a small part of the available surface area appeared to be bonded, this area increasing with the bonding load. Surfaces apposed immediately after preparation showed an appreciably higher force of separation than those joined after a time interval. The force of separation for surfaces placed together at 0% relative humidity was higher than that at 100% relative humidity. A simplified theory of bonding of irregular ice surfaces is formulated in the appendix. The calculations are based on the assumption of a distribution of small ice cylinders of equal cross sections but different heights located on a non-deformable plate. The cylinders are deformed by a constant force which is applied by another completely non-deformable flat plate. The deformation as a function of force and time and the force of separation as a function of load are derived, assuming that the distribution of heights is given by a box distribution (i.e., frequency of heights is constant).
    Type of Medium: Series available for loan
    Pages: iv, 6, A4 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 61
    Language: English
    Note: CONTENTS Preface Summary Introduction Materials Apparatus and procedure Results Discussion References Appendix: Compression of an assembly of cylinders
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  • 6
    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-202-62
    In: Research report / Cold Regions Research and Engineering Laboratory, 62
    Description / Table of Contents: Summary: Adhesive strength of ice for the systems ice/stainless steel and ice/optically flat fused quartz has been investigated as a function of surface roughness of steel surfaces and rates of shear for steel and quartz. The adhesive strength decreases with decreasing roughness of steel surfaces and the force vs time curves for smooth steel plates resemble those of two solids sliding over each other with a liquid layer sandwiched between them. This is particularly so in the case of quartz. The adhesive strength as a function of rate of shear is linear both for ice/stainless steel and ice/quartz; however, there are indications of yield values. The experimental results are in agreement with the assumption of a liquidlike layer on ice. Ratios of viscosity coefficient to the thickness of the layer have been evaluated for both systems and viscosity coefficients are estimated. The importance of interfacial free energy considerations is pointed out.
    Type of Medium: Series available for loan
    Pages: iii, 10 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 62
    Language: English
    Note: CONTENTS Preface Summary Introduction Experimental Materials Apparatus Experimental results Ice/metal interface Ice/quartz interface Discussion References
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  • 7
    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-202-63
    In: Research report / Cold Regions Research and Engineering Laboratory, 63
    Description / Table of Contents: Summary: Experiments have been carried out on the plastic deformation of thick-walled snow-ice cylinders under hydrostatic pressure as a function of pressure and temperature. At constant circumferential stress and temperature the natural strain rate of closure is a constant. This constant varies with the circumferential stress according to a sine function and is exponentially dependent on temperature with an energy of activation of 14.1 kcal/mole at an average circumferential stress of 3.1 kg/cm^2. The mechanism of the plastic flow is in agreement with a mechanism proposed previously, that is, flow between grain boundaries takes place.
    Type of Medium: Series available for loan
    Pages: iv, 7 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 63
    Language: English
    Note: CONTENTS Preface Summary Experimental Materials Apparatus Experimental results Deformation under constant hydrostatic pressure Deformation as a function of hydrostatic pressure Deformation as a function of temperature at constant pressure Discussion References
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  • 8
    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-202-67
    In: Research report / Cold Regions Research and Engineering Laboratory, 67
    Description / Table of Contents: Summary: The temperature distribution in snow subjected to gamma radiation from an operating nuclear reactor is analyzed mathematically, assuming that the effect of radiation is equivalent to a continuous heat source, the intensity of which is a function of the radial distance from the reactor. Steady-state solutions are derived for two cases: when the radial distance is 13 ft and when it is 19.1 ft. The results indicate that the temperature of the snow in certain regions in the several feet immediately below the foundation will exceed the design limit of 20°F. Increasing the shielding of the reactor will reduce the intensity of the radiation and snow temperature. Other possible ways to reduce the snow temperature include the use of refrigeration coils and the forcing of the atmospheric air through the snow.
    Type of Medium: Series available for loan
    Pages: iii, 4 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 67
    Language: English
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  • 9
    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-202-64
    In: Research report / Cold Regions Research and Engineering Laboratory, 64
    Description / Table of Contents: Summary: The distribution of temperature throughout an idealized ice cap is studied. The idealized ice cap is considered as one with a constant growth rate, without internal movement, subject to a linear climatic change and to a constant geothermal influx. The problem is treated as a Stefan-type problem and the solution is obtained by the principle of superposition. The results indicate that the temperature at the base of the ice cap rises with time and eventually would reach the melting point of the ice. Under such conditions, it is concluded that the ice cap is not resting on a permafrost base as suggested by previous investigation.
    Type of Medium: Series available for loan
    Pages: iv, 8 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 64
    Language: English
    Note: CONTENTS Preface Summary Introduction Mathematical development Method of solution Discussion of results Base temperature Minimum temperature Effect of rate of growth Effect of geothermal influx Comparison with observed results References
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  • 10
    Unknown
    Cambridge : Cambridge Univ. Press
    Keywords: Risiko ; Psychologie ; Risikoverhalten
    Pages: Online-Ressource (XIV, 368 S.) , graph. Darst.
    Edition: 2. ed.
    Edition: Online-Ausg. 2014
    ISBN: 9781139061933 (ebook) , 9781107017016 (print; hardback) , 9781107602700 (print; paperback)
    Language: English
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