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  • 1
    Series available for loan
    Series available for loan
    Hanover, NH : U. S. Cold Regions Res. and Eng. Laboratory
    Associated volumes
    Call number: ZSP-201-78/28
    In: CRREL Report, 78-28
    Type of Medium: Series available for loan
    Pages: x, 112 S. : Ill., Kt.
    Series Statement: CRREL Report 78-28
    Language: English
    Note: CONTENTS Abstract Preface Conversion factors Introduction Descriptions of road test sections Test equipment and procedures Field repetitive plate bearing tests Data analysis General Layered-elastic analysis of the pavement systems Statistical analysis Flexural analysis Summary and conclusions Literature cited Appendix A: Resilient surface deflections for the test points ILLUSTRATIONS Figure Test sites, Maine Cross sections of road test sections CRREL Mobile Repetitive Plate Bearing test vehicle Typical load pulses generated by the RPB apparatus Interior view of the RPB test vehicle 66. Instrumentation installed in test vehicle Adjusting a linear variable differential transformer before start of test Schematic of recorded output of the load cell and an LVDT mounted ono the load plate Measured resilient deflection profile for test point 2 at Peru Resilient modulus of asphalt pavement as a function of temperature Dimensionless deflection profiles for asphalt stabilized base test section at Peru Average dimensionless deflection profiles for various cross section Permanent surface deflections during testing as a function of thenumber of load applications for Peru test points 3, 5 and 5A TABLES Table Typical resilient surface deflection tests Resilient moduli from Chevron Program Variation in resilient modulus of pavement base, subbase andsubgrade materials Resilient stiffness es for various pavement sections
    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-202-331
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Introduction. - An overview of the model structure and operation. - Operation of subroutines. - TSTART. - FOMO. - REAWEA. - SEARCH. - STEMP. - TUNPIC. - Development history of the simulator. - The simulation of snow fence effects. - Urbanization and meltout. - Conclusion. - Literature cited. - Appendix A: Mathematical notation. - Appendix B: Computerprogram. - Abstract.
    Description / Table of Contents: An annual snow-soil simulator for Arctic tundra was developed using coupled models of surface equilibrium temperature and substrate thermal diffusion. Snow ripening, melt and accumulation are modeled in the simulator which is forced with daily weather data. The simulator predicts that a snow fence array capable of producing drift deeper than 4.2 meters will initiate a permanent snowfield at Barrow, Alaska. Such a man-induced snowfield could serve as a reliable source of fresh water for Barrow and similar villages in the North Slope region of Alaska. Further analysis indicated that albedo reduction due to dust fall, snow removal, etc., is dominant over aerodynamic effects in producing the early spring meltout observed at Barrow Village.
    Type of Medium: Series available for loan
    Pages: iv, 18 S. : Ill., graph. Darst.
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 331
    Branch Library: AWI Library
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  • 3
    Call number: ZSP-201-82/37
    In: CRREL Report, 82-37
    Description / Table of Contents: This report presents a Landsat-derived land cover map of the northwest portion of the Arctic National Wildlife Refuge, Alaska. The report is divided into two parts. The first is devoted to the land cover map with detailed descriptions of the mapping methods and legend. The second part is a description of the study area. The classification system used for the maps is an improvement over existing methods of describing tundra vegetation. It is a comprehensive method of nomenclature that consistently applies the same criteria for all vegetation units. It is applicable for large- and small-scale mapping and is suitable for describing vegetation complexes, which are common in the patterned-ground terrain of the Alaskan Arctic. The system is applicable to Landsat-derived land cover classifications. The description of the study area focuses on five primary terrain types: flat thaw-lake plains, hilly coastal plains, foothills, mountainous terrain, and river flood plains. Topography, landforms, soils and vegetation are described for each terrain type. The report also contains area summaries for the Landsat-derived map categories. The area summaries are generated for the five terrain types and for the 89 townships within the study areas. Two land cover maps at 1:250,000 are included.
    Type of Medium: Series available for loan
    Pages: 68 Seiten , Illustrationen, 2 Karten
    Series Statement: CRREL Report 82-37
    Language: English
    Note: CONTENTS Abstract Preface Foreword Introduction A land cover map of the ANWR study area Legend development Mapping method Results Discussion Description of the ANWR study area General description Description of specific terrain types Conclusions Literature cited Appendix A: Descriptions of Landsat land cover categories for ANWR Appendix B: Area summaries Appendix C: Aproximate equivalent units in several systems of land cover, wetland and vegetation classifications used in northern Alaska Appendix D: Soil taxonomy Appendix E: Summary of principal Landsat land cover categories within the terrain types of the ANWR study area
    Location: AWI Archive
    Branch Library: AWI Library
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  • 4
    Publication Date: 2013-08-31
    Description: A shock-related separation of a turbulent boundary layer has been studied and documented. The flow was that of an axisymmetric turbulent boundary layer over a 5.02-cm-diam cylinder that was aligned with the wind tunnel axis. The boundary layer was compressed by a 30 deg half-angle conical flare, with the cone axis inclined at an angle alpha to the cylinder axis. Nominal test conditions were P sub tau equals 1.7 atm and M sub infinity equals 2.85. Measurements were confined to the upper-symmetry, phi equals 0 deg, plane. Data are presented for the cases of alpha equal to 0. 5. and 10 deg and include mean surface pressures, streamwise and normal mean velocities, kinematic turbulent stresses and kinetic energies, as well as reverse-flow intermittencies. All data are given in tabular form; pressures, streamwise velocities, turbulent shear stresses, and kinetic energies are also presented graphically.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: A-88211 , NASA-TM-101008 , NAS 1.15:101008
    Format: application/pdf
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  • 5
    Publication Date: 2013-08-31
    Description: Shock-wave unsteadiness was observed in rapidly compressed supersonic turbulent boundary layer flows with significant separation. A Mach 2.85 shock-wave/turbulent boundary layer flow was set up over a series of cylinder-flare bodies in the High Reynolds Number Channel 1. The transition from fully attached to fully separated flow was studied using axisymmetric flares with increasing compression angles. In the second phase, the 30 deg flare was inclined relative to the cylinder axis, so that the effect on a separated flow of increasing 3 dimensionality could be observed. Two 3-D separated cases are examined. A simple conditional sampling technique is applied to the data to group them according to an associated shock position. Mean velocities and turbulent kinetic energies, computed from the conditionally samples data, are compared to those from the unsorted data and to computed values. Three basic questions were addressed: can conditional sampling be used to provide snapshots of the flow; are averaged turbulence quantities dominated by the bimodal nature of the interaction; and is the shock unsteadiness really important to computational accuracy.
    Keywords: AERODYNAMICS
    Type: NASA-TM-89224 , NAS 1.15:89224
    Format: application/pdf
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  • 6
    Publication Date: 2018-12-01
    Description: Mean-velocity and turbulence measurements obtained by two-component laser Doppler velocimetry are presented, together with numerical predictions, for the shock-related separation of a turbulent boundary layer at Mach 2.85. The basic geometry, a 30 deg half-angle flare mounted on a long cylinder, is made three-dimensional by tipping the flare at an angle of attack, alpha. The separation length and general upstream influence increase with alpha. A recirculating vortex in the separated zone becomes stronger as three-dimensionality increases. A large-scale unsteadiness of the separation shock wave and surrounding flowfields grows in amplitude with alpha, and appears to strongly influence the amplification of turbulence correlations ahead of detachment. Scaling of the streamwise coordinate by separation length causes two-dimensional and three-dimensional data profiles on the cylinder to collapse for most measured quantities.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-0553
    Format: text
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  • 7
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 26; 52-56
    Format: text
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  • 8
    Publication Date: 2019-07-12
    Description: Report documents surface and flow-field measurements of two- and three-dimensional, shock-separated, turbulent boundary layers. Data tabulated to facilitate comparison with other measurements and computations. Shows shock-interaction shadowgraph and oil-flow pattern for each angle. Plotted profiles given for pressures, velocities, Reynolds stresses, and turbulent kinetic energies.
    Keywords: MECHANICS
    Type: ARC-12298 , NASA Tech Briefs (ISSN 0145-319X); 14; 11; P. 78
    Format: text
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  • 9
    Publication Date: 2019-07-13
    Description: Shock-wave unsteadiness was observed in rapidly compressed supersonic turbulent boundary layer flows with significant separation. A Mach 2.85 shock-wave/turbulent boundary layer flow was set up over a series of cylinder-flare bodies in the High Reynolds Number Channel 1. The transition from fully attached to fully separated flow was studied using axisymmetric flares with increasing compression angles. In the second phase, the 30-deg flare was inclined relative to the cylinder axis, so that the effect on a separated flow of increasing three-dimensionality could be observed. Two 3-D separated cases are examined. A simple conditional sampling technique is applied to the data to group them according to an associated shock position. Mean velocities and turbulent kinetic energies, computed from the conditionally sampled data, are compared to those from the unsorted data and to computed values. Three basic questions were addressed: can conditional sampling be used to provide snapshots of the flow; are averaged turbulence quantities dominated by the bimodal nature of the interaction; and is the shock unsteadiness really important to computational accuracy.
    Keywords: AERODYNAMICS
    Type: Intl. Symposium on Transport Phenomena in Turbulent Flows: Theory, Experiment, and Numerical Simulation; Oct. 1987; Tokyo; Japan
    Format: text
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  • 10
    ISSN: 0300-9629
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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