ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Books  (24)
  • 2005-2009
  • 1995-1999  (7)
  • 1990-1994  (17)
  • AWI Archive  (24)
Collection
  • Books  (24)
Language
Years
Year
Branch Library
  • 1
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-95/11
    In: CRREL Report, 95-11
    Description / Table of Contents: A pavement joint seal prevents the passage of liquids into the pavement base and the intrusion of solids into the joint. The primary mechanical requirements of a pavement seal are that it respond elastically or viscoelastically to any movement of the joint without failure and that it withstand indentation of hard objects like rocks. Because pavement joint movements and seal deformations can be large, elastomeric sealants are often used to form seals. Winter conditions are recognized as the most critical for a seal because of the possibility that failure stresses will be reached as the joint opens to a maximum and the material stiffens in response to the temperature reduction. This report reviews the specific problems and requirements that cold climates create for the performance of elastomeric seals. Emphasis is placed on the material response behavior that can lead to failure of a seal. In an attempt to clarity the mechanics of sealant and seal performance associated with low-temperature pavement applications and to address the issue of low-temperature stiffening That should be a dominant factor in the selection of a sealant, this report presents background information on the formulation and mechanical properties of elastomeric seal materials and the structural behavior of field-molded joint and crack seals.
    Type of Medium: Series available for loan
    Pages: iv, 20 Seiten , Illustrationen
    Series Statement: CRREL Report 95-11
    Language: English
    Note: CONTENTS Page Preface Introduction Elastomers and sealant formulations Mechanical behavior of sealants Phenomenological behavior of rubbers and elastomers Hyperelastic constitutive model Examples of sealant behavior Mechanical response of seals Basic structural geometry and loading configurations of seals Conventional performance testing for studying the load and deformation response of joint and crack seals Response of seals to joint movements Summary and recommendations Literature cited Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-93/9
    In: CRREL Report, 93-9
    Description / Table of Contents: Traction on winter surfaces was measured using three test vehicles, each designed to measure traction for a different purpose: vehicle mobility research (CRREL Instrumented Vehicle), commercial tire testing (Uniroyal- Goodrich traction tester), and airport runway safety (Saab friction tester). The traction measured with each method is comparable, but there are systematic differences due to the effects of the surface material and the test and analysis technique. This comparison serves as the fundamental basis for collaboration between the various traction testing communities and illustrates the need for well documented test procedures and data analysis as a standard for traction testing and evaluation.
    Type of Medium: Series available for loan
    Pages: iii, 21 Seiten , Illustrationen
    Series Statement: CRREL Report 93-9
    Language: English
    Note: CONTENTS Preface Introduction Traction test methods Saab friction tester Uniroyal-Goodrich traction tester CRREL Instrumented Vehicle Surfaces tested Reporting results and terminology Factors influencing traction Results Traction curves for each surface Traction coefficients Conclusion Literature cited Appendix A: Vehicle instrumentation and samples of graphic output Appendix B: Comparison of measured traction coefficients with published andpredicted values Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Call number: AWI SCAR-AR-19-92813
    In: National report to SCAR on Antarctic scientific activities for the years ... and planned program for ... : progress report, 41
    Type of Medium: Series available for loan
    Pages: 25 Seiten
    Series Statement: National report to SCAR on Antarctic scientific activities for the years ... and planned program for ... : progress report 41
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Call number: AWI SCAR-IT-19-92821
    In: Italy antarctic research report to SCAR, June-1999
    Type of Medium: Series available for loan
    Pages: 15, V Seiten
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-92/17
    In: CRREL Report, 92-17
    Description / Table of Contents: The CRREL Instrumented Vehicle (CIV), shear annulus, direct shear, andtriaxial compression devices were used to characterize the strength ofthawed and thawing soil. These strength values can be used in simpletraction models to predict the tractive performance of vehicles. Strength was evaluated in terms of the parameters c' and Φ' based on the Mohr-Coulomb failure criterion. It is proposed here that an instrumented vehicle is best suited for terrain characterization for mobility studies because the conditions created by a tire slipping on a soil surface are exactly duplicated. The c' and Φ' values from the shear annulus were found to overpredict traction because of the low normal stress applied by the annulus and the curved nature of the failure envelope. Of all the tests, the direct shear test yielded the highest Φ' value, most likely because the test was run at a slow deformation rate under drained conditions. The triaxial test results were the most similar to those from the vehicle. All test methods show Φ' increasingwith soil moisture up to the liquid limit of the soil and then decreasing. As measured with the vehicle, was also found to be strongly influenced by the thaw depth.
    Type of Medium: Series available for loan
    Pages: 17 Seiten , Illustrationen
    Series Statement: CRREL Report 92-17
    Language: English
    Note: CONTENTS Introduction Objective Background Strength measurement techniques Triaxial compression Direct shear Shear annulus device CRREL Instrumented Vehicle Discussion Comparison of methods Influence of soil conditions Traction prediction Conclusions References Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Call number: ZSP-201-93/11
    In: CRREL Report, 93-11
    Description / Table of Contents: A laboratory study of the behavior of snow under shock wave loading and unloading conditions was conducted using a 200-mm-diameter gas gun to generate loading waves in snow samples with initial densities of 100 to 520 kg m-3 at temperatures of -2 to -23 deg C. Stress levels were 2 to 40 MPa. The response of snow to shock wave loading was measured as a function of distance from the impact plane using embedded stress gauges. Large impedance differences between snow and the stress gauges produced complex stress histories. A finite element model, along with a simple analytical model of the experiment, was used to interpret the stress histories. Snow deformation was not affected by initial temperature, but was found to be rate dependent. The initial density of the snow determined its pressure-deformation path. The pressure needed to compact snow to a specific final density increases with decreasing initial density. The release moduli increased nonlinearly from 50 MPa at a snow pressure of about 15 MPa to 2700 MPa at a snow pressure of about 40 MPa.
    Type of Medium: Series available for loan
    Pages: iii, 150 Seiten , Illustrationen
    Series Statement: CRREL Report 93-11
    Language: English
    Note: CONTENTS Preface Introduction Experimental equipment and methods Gas gun Snow target assembly Data acquisition Experimental procedure Measured data Stress histories Snow characterization Data analysis Recommendations Experimental methods Experimental needs Summary Literature cited Appendix A : Stress-time data plots Appendix B: Tabulated stress-time data Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Call number: ZSP-201-94/12
    In: CRREL Report, 94-12
    Description / Table of Contents: Subsurface radar was used to profile ice and snow conditions on the Ross Ice Shelf at McMurdo Station, Antarctica, during mid-January 1993. Deconvolution and migration were often used to improve vertical resolution and spatial imaging. Profiles at a pulse center frequency of 400 MHz along the 3.2-km-long Pegasus ice runway show many low-density horizons above 9 m depth that are up to 30 m long. They are associated with air bubbles included during refreezing of meltwater and are interpreted as layers between a few and tens of centimeters thick. There is a strong reflecting horizon at about 9 m depth that is probably from brine intrusion as it is continuous with the intrusion into the snow to the east. Diffraction asymptotes give a dielectric constant near 3.2 for material above the brine level, a value that implies near-solid ice. Profiles at 100 MHz along the road between Pegasus runway and Williams Field in the accumulation zone show snow features such as layer deformation and intrusive brine layers that both abruptly and gradually change in depth. A single profile at a relic solid waste dump at Williams Field detected buried debris and ice within the upper 7 m. A survey of a suspected fuel spill shows some local disturbances near the center, but no excavation was done to verify the findings. Profiles traversing the sewage sumps at Williams Field outline the extent of the sewage deposition, and give depths to contaminated snow that closely agree with observation. Despite variability in dielectric properties, single-layer migration effectively improves the resolution of subsurface conditions. Recommendations are made for future surveys.
    Type of Medium: Series available for loan
    Pages: iv, 29 Seiten , Illustrationen
    Series Statement: CRREL Report 94-12
    Language: English
    Note: CONTENTS Preface Introduction Radar equipment General operation Antennas Waveforms and phase polarity Antenna directivity Field procedures and data processing Field procedures Data recording Data processing Site location Results Pegasus runway Access road from Williams Field to Pegasus runway Williams Field Summary and conclusions Literature cited Appendix A: Airborne profile of a portion of the access road Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Call number: ZSP-SCAR-701
    Type of Medium: Series available for loan
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Call number: ZSP-201-90/9
    In: CRREL Report, 90-9
    Description / Table of Contents: In 1986, a mobility model was developed for predicting the traction and motion resistance of both wheeled and tracked vehicles on shallow snow, and a winter field season was dedicated to gathering mobility data for a diverse family of vehicles (including four on wheels and three tracked) to validate the model. The original version of the model, SSM 1.0, used the Mohr-Coulomb shear failure equation from soil mechanics to predict gross traction. This required input of the snow strength parameters c and ȹ. Motion resistance is predicted by calculating the amount of work done by the tire in compacting snow and only requires snow depth and density values as input snow properties. Some effort was expended in determining an easy and reliable method of obtaining snow strength established from past instrumented vehicle test results. Historically, shear annulus apparati have been used to obtain Mohr-Coulomb strength parameters. A comparison of snow strength obtained via these three methods (shear annulus, instrumented vehicle, calculated from initial density using the relationship in SSM 1.0) for individual snow covers showed no agreement. SSM 1.0 assumed that snow strength parameters for mobility prediction were a function of initial snow density; however, traction is developed in the compacted snow under the driving element, whose strength properties bore little relation to those of the initial snow. It appears that the shear strength of the compacted snow is essentially a constant for all of the vehicles and snow covers tested here. Based on this finding, a new traction algorithm was developed, resulting in the creation of a second generation model, SSM 2.0. This algorithm predicts gross traction, on the average for the vehicles tested, within 7% of the measured value. Motion resistance prediction remains unchanged in SSM 2.0. This quantity is still not predicted with a desirable level of accuracy.
    Type of Medium: Series available for loan
    Pages: v, 72 Seiten , Illustrationen
    Series Statement: CRREL Report 90-9
    Language: English
    Note: CONTENTS Preface Nomenclature Introduction Background Field experiments Test location and test sites Test vehicles Test procedures Results CIV traction and motion resistance Wheels/trackcs vehicles traction and motion resistance Shear annulus device Accuracy and limitations of data Snow conditons Analysis Determination of snow strength parameters Traction analysis Traction model predictions Resistance analysis Resistance model predictions Conclusions and recommendations Literature cited Appendix A: Shallow snow mobility model, version 1.0 Appendix B: Test vehicle data Appendix C : Selected test data Appendix D : Snow data Appendix E: Shallow snow mobility model code, version 2.0 Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-91/5
    In: CRREL Report, 91-5
    Description / Table of Contents: An analysis of the National Science Foundation's surface vehicle fleet in Antarctica is reported on here. Surface vehicle needs have been determined through interviews of vehicle users, managers and maintainers, and from direct on-site observation. An ideal grouping of vehicle categories is proposed that will address current needs and provide flexibility for the future. Ultimately, recommendations for streamlining and modernizing the NSF Antarctic vehicle fleet are made. Cargo transportation over snow was identified as being in a crisis state. Personnel movement functions for all but traversing are performed adequately at this time, although there is much room for improvement. Brands and models must be selected for some categories of recommended vehicle types. This will naturally follow a more in-depth analysis of candidates and discussions with NSF vehicle managers. A purchasing plan, including a time table, budget, and desired sequence of replacement, must then be formulated and executed.
    Type of Medium: Series available for loan
    Pages: v, 71 Seiten , Illustrationen
    Series Statement: CRREL Report 91-5
    Language: English
    Note: CONTENTS Preface Executive summary Introduction Regional divisions Zone A - rock and ice roads Zone B - local ice Zone C - traverse Zone D - ice edge Zone E - remote field site Zone F - inland station Current transportation needs in Antarctica Future transportation needs Transportation analysis Personnel transport Cargo transport Summary of analysis Recommendations for changes to U.S. vehicle fleet Conclusions and summary of findings Literature cited Appendix A: Age distribution of NSF surface vehicles Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 11
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-91/12
    In: CRREL Report, 91-12
    Description / Table of Contents: Field trials using a man-portable Geonics, Ltd., EM31 electromagnetic induction sounding instrument, with a plug-in data processing module, for the remote measurement of sea ice thickness, are discussed. The processing module was made by Flow Research Inc., to directly measure sea ice thickness and show the result in a numerical display. The EM31-processing module system was capable of estimating ice thickness within 10% of the true value for ice from about 0.7 to 3.5 m thick, the oldest undeformed ice in the study area. However, since seawater under the Arctic pack ice has a relatively uniform conductivity (2.5 + or - 0.05 S/m), a simplified method, which can be used for estimating sea ice thickness using jet an EM31 instrument, is discussed. It uses only the EM31's conductivity measurement, is easy to put into use and does not rely on theoretically derived look-up tables or phasor diagrams, which may not be accurate for the conditions of the area.
    Type of Medium: Series available for loan
    Pages: iv, 23 Seiten , Illustrationen
    Series Statement: CRREL Report 91-12
    Language: English
    Note: CONTENTS Preface Introduction EM 31 Sounding concepts Previous EMI studies Beaufort Sea field trials EM 31 Conductivity reading versus sea ice thickness General comments Literature cited Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 12
    Call number: ZSP-312-1997,1
    In: Geografija i prirodnye resursy, 1/1997
    Type of Medium: Series available for loan
    Pages: 203 Seiten , Illustrationen
    ISSN: 0206-1619
    Series Statement: Geografija i prirodnye resursy 1/1997
    Language: Russian
    Note: Contents: Natural-resource regionalization of Russia / I. L. Savelyeva. - Ecological substantiation of land improvement in Russia / V. M. Ivonin. - Soil and geochemical mapping for purposes of environment conservation / A. D. Abalakov, E. G. Nechaeva, A. I. Schetnikov. - Equiplains and equiplainazation in the mountains of South Siberia / L. N. Ivanovsky. - Environmental control. - Changes of natural conditions under the influence of reservoirs / Yu. B. Trzhtsinsky, E. A. Kozyreva, O. A. Mazayeva. - Consequences of Severomuisky tunnel construction / L. L. Shabynin. - On heavy metals content in glaciers of Katunsky Ridge / A. A. Bondarovich. - Changes of mercury concentration in natural objects of the ecosystem of Kureiskoye Reservoir / L. M. Sorokovikova, L. D. Andrulaitis, V. M. Domysheva. - Nature management in the Baikal Basin. - Dam lakes of the East Siberia rifts' floor: the evidence from the past and likelyhood in the future / A. A. Kulchitsky, T. M. Skovitina, G. F. Ufimtsev. - Changes of state of the South Baikal Shelf under the influence of drainage waters from the Baikal Pulp and Paper Mill (BPPM) / E. I. Grosheva, R. P. Loseva, N. I. Kchotilovitch, G. N. Voronskaya, G. V. Belyavtseva, N. P. Melchakova, E. V. Shisiareva. - Patterns of structure and development of mountain landscapes of Pribaikalye (on the example of Baikal Ridge) / V. M. Plyusnin. - Geomorfological processes of the Priolkhonye in Holocene / S. A. Makarov. - Regional problems of nature studying and using the natural resources. - Special features of river bends in variuos natural environments (on the example of rivers Vychegda, Tchulym, Viluyi) / A. S. Zavadsky, L. N. Nikitina, R. S. Chalov. - The relief of and contemporary exogenic processes in the basins of Tsipa Branch (North-West of Zabaikalye) / V. B. Vyrkin. - Loose deposits and exogenic processes on the watershed of rivers Kaya and Irkut / D. D. Perevoznikov. - Quaternary volcanic ash in landscapes of Northern Priochotye / A. A. Galanin, O. P. Galanina. - Dynamics of landscape-climatic turns in the PriYenisei part of Kasskaya Plain in Holocene / A. D. Koshkarov, V. L. Koshkarova. - Consentration of microelements, and its season changes in conditions of PriokskoTerrasny biosphere nature reserve / S. V. Litkens. - Development and allocation of productive forces. - Restoration of sea bottom ecosystems (ecologic-economical aspect) / V. V. Zharikov, B. V. Preobrazhensky. - An assessment of territorial ecological balance in the Krasnoyarsk industrial-urban agglomeration / A. E. Miroshnikov, T. P. Strimzha, O. V. Antsiferova, N. A. Kochneva, S. V. Maksimova. - Traditional culture as base of sustainable development of indigenous people of the North / D. D. Mangataeva, G. Fondale. - Techniques of scientific studies. - Principles and methods of desighning ecologic-geographical maps using satellite imagery / B. L. Kochurov, N. N. Malakhova. - Nature-ecological assessment of urban environmental quality / T. I. Konovalova, I. E. Trofimova. - Some approaches to assessment of climate resources / L. B. Bashalkhanova. - An appraisement of thunderstorms and fire danger in forests of the left bank of River Yenisei / V. A. Ivanov, G. A. Ivanova. - Experimental creation of an artificial dune on the sandy shore of the Black Sea / Yu. D. Shuisky, G. V. Vykhovanets. - Geography abroad. - Heavy metals in bio-objects of fresh water ecosystems of Japan / P. V. Ivashov, S. E. Sirotsky. - Maunder minimum of solar activity in the evolution of natural environment of Eastern Mongolia / V. P. Chichagov. - Reviews. - Conception of sustainable development in the Irkutsk Region / Yu. P. Michailov. - Integrational potential of Geography / A. P. Chechel. - State of landscapes: the book on detailed researches in Priladozhie / V. A. Snytko. - Chronicles. - Geoinformation technologies in the environmental mapping: the International Conference in Irkutsk / A. R. Batuev, V. A. Chervyakov. - The simposium in Poland: eolian processes and shapes of the relief / T. Schipek, G. N. Martyanova, V. A. Snytko. - Geographical scientific conferences in Smolensk / V. B. Pozdeev. - Anniversaries. - On the 75-th anniversary of Aleksey Alexandrovitch Nedeshev. , In kyrillischer Schrift
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 13
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-95/1
    In: CRREL Report, 95-1
    Description / Table of Contents: This report annotates the cold regions mobility prediction routines included in the CAMMS/ALBE mobility models. It further explains the development of the algorithms that are used in these models to describe the interaction of a vehicle with terrain that has been affected by cold weather. The following terrain conditions are discussed: undisturbed snow (shallow and deep); disturbed snow (moderately trafficked and hard packed); ice; and thawing soils. Several combinations of substrates are also considered. A stand-alone computer model is included.
    Type of Medium: Series available for loan
    Pages: v, 72 Seiten , Illustrationen
    Series Statement: CRREL Report 95-1
    Language: English
    Note: CONTENTS Page Preface Nomenclature Introduction Background Shallow snow Undisturbed snow on a firm substrate Undisturbed snow on a soft substrate Undisturbed snow over ice Disturbed, processed and packed snow Deep snow Ice Freezing or thawing ground conditions Bearing capacity of freezing ground Effect of thawing conditions on vehicle performance Speed made good Internal motion resistance Slopes Summary and recornmendations Literature cited Appendix A: Cold Regions Mobility Model CRM-1.F Appendix B: FORTRAN code using NRMM/CAMMS variables and format Appendix C: Traction coefficients on packed snow Appendix D: NRMM checkout data Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 14
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-93/3
    In: CRREL Report, 93-3
    Description / Table of Contents: Results are presented of a study to determine appropriate methods of flow modification for mitigating ice jam formation in navigable rivers. Based on a review of alternative methods for flow modification, it is concluded that for many rivers, especially large ones, the most appropriate method involves controlled ice-cover formation through the regulation of river flow. Flow discharge and stages would be regulated by controlling the flow releases from reservoirs and flow stages at river dams, such that optimal flow conditions prevail for rapid formation, and subsequent maintenance, of an accumulation ice cover over river reaches in which potentially large amounts of frazil ice may grow. Accumulation covers would be formed of frazil ice pans and floes and, if appropriate, broken ice conveyed from upstream. Existing dams, augmented where needed by navigable ice booms, could serve as retention structures for the development of accumulation covers. A preliminary indication of the feasibility of this method for controlling ice-cover formation on stage-regulated pools of the Ohio River is assessed through the use of a numerical model that simulates ice-cover formation from frazil ice. It is found that this approach holds promise for mitigating jam occurrence, although its implementation necessarily entails management of flow through major portions of the Ohio River. The results of the study are, to a limited extent, generalized to other rivers.
    Type of Medium: Series available for loan
    Pages: v, 58 Seiten , Illustrationen
    Series Statement: CRREL Report 93-3
    Language: English
    Note: CONTENTS Preface Nomenclature Introduction Background Scope of the study Control of river ice formation Control methods Controlled ice-cover formation for the upper Ohio River Numerical simulation of ice-cover formation Flow profile Water temperature variation Frazil ice growth Ice-cover progression Thermal growth of ice cover Numerical results Illustration of simulated ice-:over formation Ice-cover formation in the Hannibal and Montgomery pools Generalized results Conclusions and recommendations Literature cited Appendix A: Expression for coefficients Appendix B: Listing of computer program
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 15
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-94/5
    In: CRREL Report, 94-5
    Description / Table of Contents: A three-dimensional theory is derived to describe the temporal behavior of gravity currents of cohesionless granular media, in an attempt to model the motion of dense, flow-type snow avalanches, ice and rock slides. A mohr-Coulomb yield criterion is assumed to describe the constitutive behavior of the material, and the basal bed friction is described similarly by a Coulomb type of friction. A drag term is included in order to model the occurrence of flow regimes where boundary drag becomes non-negligible. Data from laboratory simulations are compared to a series of numerical studies based on the aforementioned theory. A nondimensional, depth and width averaged form of the theory is considered. A Lagrangian finite difference scheme is then applied to numerically model some limiting cases of the governing equations. Two different numerical models are developed, tested and compared to experimental values. The results indicate that the model can account for flow transitions by inclusion of the drag term when the initial inclination angle is large enough to affect boundary drag. Furthermore, the temporal and spatial evolution of the granulate and final runout position can be predicted to values well within the experimental error.
    Type of Medium: Series available for loan
    Pages: iv, 29 Seiten , Illustrationen
    Series Statement: CRREL Report 94-5
    Language: English
    Note: CONTENTS Preface Nomenclature Introduction Mathematical formulation Limiting cases of the governing equations Nondimensionalization scheme Numerical solutions and comparison to experiments Unconstrained Coulomb flow model with constant bed friction Unconstrained Coulomb flow with boundary drag term Conclusions and remarks Literature cited Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 16
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-95/7
    In: CRREL Report, 95-7
    Description / Table of Contents: Before vehicle mobility in snow can be reliably predicted, a complete understanding of motion resistance in snow is required. This report examines several aspects of wheeled vehicle motion resistance using results obtained with the CRREL instrumented vehicle. Resistances of leading and trailing tires are examined. Limited data are presented for undercarriage drag, and third and fourth wheel passes in the same rut are initially analyzed, as is how snow deforms around a wheel. For the CRREL instrumented vehicle, a trailing tire has a resistance coefficient of about 0.017 for snow depths less than about 22cm. For deeper snow, the disruption of the snowpack caused by a preceding wheel causes snow to fall into the rut, resulting in higher trailing tire coefficients. For larger vehicles, which in some cases have trailing tires carrying larger loads than preceding tires, the trailing tire coefficients are on the order of 0.048 and 0.025 for second and third trailing wheels respectively. Since there are no trailing tire data available for these larger vehicles, these values are based on nonlinear regression analysis, which includes a prediction of the leading tire resistance. The results and observations of this study are applied in a reanalysis of the towed resistance data obtained during the U.S. Army's Wheels vs. Tracks study. An improved algorithm is presented for predicting wheeled vehicle motion resistance caused by snow.
    Type of Medium: Series available for loan
    Pages: v, 39 Seiten , Illustrationen
    Series Statement: CRREL Report 95-7
    Language: English
    Note: CONTENTS Page Preface Nomenclature Introduction Experimental procedure Results and analysis Leading tire resistance Trailing tire resistance Deep snow Undercarriage drag Multiple passes Shallow snow resistance model Summary Literature cited Appendix A: Snow data Appendix B: Observations of snow deformation by a wheel Appendix C: Wheeled vehicle motion resistance data Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 17
    Call number: ZSP-SCAR-570-16
    In: National Antarctic Research Report to SCAR, No. 16
    Type of Medium: Series available for loan
    Pages: 99 Seiten , Illustrationen
    ISSN: 0179-0072
    Series Statement: National Antarctic Research Report to SCAR 16
    Language: English
    Note: CONTENTS: I. National Committee for Antarctic Research, and National Operating Body. - II. Map of Stations. - Ill. Permanent Observatories, Regular Observations and Long-term Monitoring. - IV. Report on Highlights of Science Activities from Previous Reporting Period (1 Oct. 93 - 31 March 94). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - V. List of Permits and Rationale for Entry into SPAs and SSSIs. - VI. Prospectus of Planned Activities for Coming Reporting Period (1 April 94 - 31 March 95). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VII. Future Activities Planned & Funded (beyond 31 March 95). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VIII. Bibliography. - IX. List of Principal Investigators and Responsible Authorities.
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 18
    Call number: ZSP-SCAR-570-14
    In: National Antarctic Research Report to SCAR, No. 14
    Type of Medium: Series available for loan
    Pages: 133 Seiten , Illustrationen
    ISSN: 0179-0072
    Series Statement: National Antarctic Research Report to SCAR 14
    Language: English
    Note: CONTENTS: I. National Committee for Antarctic Research, and National Operating Body. - II. Map of Stations. - Ill. Permanent Observatories, Regular Observations and Long-term Monitoring. - IV. Report on Highlights of Science Activities from Previous Reporting Period (1 Oct. 91 - 31 March 92). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - V. List of Permits and Rationale for Entry into SPAs and SSSIs. - VI. Prospectus of Planned Activities for Coming Reporting Period (1 April 92 - 31 March 93). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VII. Future Activities Planned & Funded (beyond 31 March 93). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VIII. Bibliography. - IX. List of Principal Investigators and Responsible Authorities.
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 19
    Call number: ZSP-SCAR-570-13
    In: National Antarctic Research Report to SCAR, No. 13
    Type of Medium: Series available for loan
    Pages: 123 Seiten , Illustrationen
    ISSN: 0179-0072
    Series Statement: National Antarctic Research Report to SCAR 13
    Language: English
    Note: CONTENTS: I. National Committee for Antarctic Research, and National Operating Body. - II. Map of Stations. - Ill. Permanent Observatories, Regular Observations and Long-term Monitoring. - IV. Report on Highlights of Science Activities from Previous Reporting Period (1 Oct. 90 - 31 March 91). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - V. List of Permits and Rationale for Entry into SPAs and SSSIs. - VI. Prospectus of Planned Activities for Coming Reporting Period (1 April 91 - 31 March 92). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VII. Future Activities Planned & Funded (beyond 31 March 92). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences (incl. Marine Chemistry). - VIII. Bibliography. - IX. List of Principal Investigators and Responsible Authorities.
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 20
    Call number: ZSP-SCAR-570-12
    In: National Antarctic Research Report to SCAR, No. 12
    Type of Medium: Series available for loan
    Pages: 83 Seiten , Illustrationen
    ISSN: 0179-0072
    Series Statement: National Antarctic Research Report to SCAR 12
    Language: English
    Note: Beilage unter dem Titel: SCAR : Wissenschaftliches Komitee für Antarktisforschung , Beilage unter dem Titel: Deutsche Mitglieder in SCAR-Gruppen = German members in SCAR Groups , Beilage unter dem Titel: Corrigendum / German Antarctic Research Report to SCAR, No. 12 - 1990 , Beilage unter dem Titel: SCAR Bulletin : No. 99, October 1990 ; Stations of SCAR nations operating in the Antarctic, winter 1990 , CONTENTS: I. National Committee for Antarctic Research, and National Operating Organization/Agency. - II. Map of Stations. - Ill. Permanent Observatories, Regular Observations and Long-term Monitoring. - IV. Report on Highlights of Science Activities from Previous Reporting Period (1 Oct. 89 - 31 March 90). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences. - V. List of Permits and Rationale for Entry into SPAs and SSSIs. - VI. Prospectus of Planned Activities for Coming Reporting Period (1 April 90 - 31 March 91). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences. - VII. Future Activities Planned & Funded (beyond 31 March 91). - A. Biology. - B. Geodesy & Geographic Information. - C. Geology. - D. Solid Earth Geophysics. - E. Glaciology. - F. Human Biology & Medicine. - G. Atmospheric Sciences. - H. Logistics. - I. Ocean Physical Sciences. - VIII. Bibliography. - IX. List of Principal Investigators and Responsible Authorities.
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 21
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-95/14
    In: CRREL Report, 95-14
    Description / Table of Contents: Current protocols for decontaminating devices used to sample groundwater for organic contaminants are re­viewed. Most of the methods given by regulatory agencies provide little scientific evidence that justify the recommended protocols. In addition, only a few studies that actually compared various decontamination proto­cols could be found in the open literature, and those studies were limited in their scope. Various approaches for decontamination and criteria that are important in determining how effectively a surface could be decontami­nated are discussed.
    Type of Medium: Series available for loan
    Pages: iii, 15 Seiten , Illustrationen
    Series Statement: CRREL Report 95-14
    Language: English
    Note: CONTENTS Preface Introduction Sorption and desorption of organic contaminants Decontamination methods Aqueous cleaning methods Cleaning or rinsing with organic solvents Chemical neutralization methods Current protocols to decontaminate groundwater sampling devices Variations in methodology Special instructions for cleaning pumps Effectiveness of various decontamination methods Low-temperature considerations Conclusions Literature cited
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 22
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-91/15
    In: CRREL Report, 91-15
    Description / Table of Contents: An overview is presented of recent activities and results in the use of commercially available short-pulse UHF radar for surveying ice conditions on freshwater bodies. Improvements in radar systems have made it possible to increase ice thickness resolution by as much as one third relative to that in past attempts, and some new signal processing approaches shown here may offer an order of magnitude improvement. Results from airborne surveying are shown in which the varieties of ice character are reflected. Given the lack of ground coupling, one can rely upon a reasonably well-defined wavelet structure for enhanced signal processing and interpretation possibilities. An algorithm is presented that locates returns from interfaces in the presence of noise for a non-minimum delay wavelet. The method performs a simple inversion in the frequency domain, enhanced by a time dependent weight designed to recognize the shape of the wavelet amplitude and phase spectra. Thin ice layers are resolved down to a few centimeters and are distinguished from an ice free condition by means of a matched filter system designed to recognize the interference pattern from parallel interfaces close to one another. The effects and constraints imposed by water layers on wet ice are discussed, as are general attenuation, sloping bottom, and critical angle effects in deeper water. In closing, observations on the problems and prospects of this sort of surveying are offered.
    Type of Medium: Series available for loan
    Pages: v, 31 Seiten , Illustrationen
    Series Statement: CRREL Report 91-15
    Language: English
    Note: Contents Preface Nomenclature Introduction Field surveys Methods and paraphernalia Results Sloping bottom effects and critical angle phenomena Deconvolution and thin layers Well-separated echoes Thin ice layers Thin layers of water Observations Literature cited Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 23
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-92/14
    In: CRREL Report, 92-14
    Description / Table of Contents: Large ice jams on the Salmon River have reached Salmon, Idaho, and resulted in major flood damage during 16 winters since the winter of 1936-37. Two recent ice jams, in February 1982 and January 1984, caused flooding that resulted in damages of $1 million and $1.8 million respectively. A detailed analysis of the winter air temperature records from 1936-37 through 1991-92 revealed a strong relationship between the duration and intensity of severe cold periods, the air temperature record prior to the severe cold periods, and the occurrence of ice jams reaching the city of Salmon that result in flooding. A threshold condition is identified from which the probability of icejams reaching the city can be determined from inspection of forecasted air temperatures. It was found that once an icejam reaches the city, average daily air temperatures of approximately 18 deg F are necessary to keep the jam in place. The effects of discharge on ice thickness, and therefore ice jam length, are shown to be minor and no relation could be found in this study. An ice control structure located upstream of the city of Salmon appears to be helping to alleviate ice-jam flooding.
    Type of Medium: Series available for loan
    Pages: iv, 18 Seiten , Illustrationen
    Series Statement: CRREL Report 92-14
    Language: English
    Note: CONTENTS Preface Conversion factors Introduction Data sources and analysis Air temperature records Air temperature curves Air temperature record analysis Discharge records Results Phase 1 Phase 2 Phase 3 Effects of discharge Salmon River ice control Conclusions Literature cited Abstract
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 24
    Series available for loan
    Series available for loan
    Berlin : Nationalkomitee für Geodäsie und Geophysik bei der Akademie der Wissenschaften der DDR
    Associated volumes
    Call number: Q 2434(15) ; MOP Per 581(1/15) ; ZSP-319/A-15
    In: Geodätische und Geophysikalische Veröffentlichungen : Reihe 1, Heft 15
    In: Antarctic research / edited by H.-J. Paech, D. Fritzsche, Vol. 1
    Type of Medium: Series available for loan
    Pages: 280 Seiten , Illustrationen
    ISSN: 0533-7577
    Series Statement: Geodätische und Geophysikalische Veröffentlichungen : Reihe 1 15
    Language: English
    Note: Contents: Volume I Earth Sciences. - Geological research of the German Democratic Republic in Antarcitca - a review / J. Hofrnann ; H.-J. Paech ; D. Fritzsche. - Structural evolution of the Ross Sea depression and the adjacent Transantarctic Mountains (Abstract) / F. Tessensohn. - Evolutionary types of sedimentary basins of the continental margin, Antarctica (Abstract) / V. V. Traube. - Age determination on detrital zircons of West Antarctica - A contribution to the reconstruction of Gondwana / W. P. Loske ; H. Miller. - Geological relations between Queen Maud Land, East Antarctica and South India / W. Stackebrandt. - The Proterozoic evolution of New Schwabenland and its correlation with the southern part of Africa (Abstract) / K. Weber ; N. Arndt ; J. Jacobs ; M. Peters. - Stratigraphy, metamorphism and nappe-tectonics in the Shackleton Range (Antarctica) / W. Buggisch ; G. Kleinschmid t; H. Kreuzer ; S. Krumm. - Comments on 'Stratigraphy, metamorphics and nappetectonics in the Shackleton Range (Antarctica)' by Buggisch, W. et al. / H.-J. Paech. - The Lambert Rift development in East Antarctica - a review (Abstract) / J. Hofmann. - Sedimentological investigations in Permian deposits of the Beaver Lake area (Prince Charles Mts., East Antarctica) - First results / M. Mann. - Contributions to the geology of the south eastern Antarctic Peninsula (Abstract) / K.-P. Stanek ; W. Weber ; K. Rank ; K. Hahne. - Geological history of western Queen Maud Land / H.-J. Paech ; A. A. Laiba ; O. G. Shulyatin. - Late Proterozoic microbiota from the Turnpike Bluff Group, Shackleton Range (Abstract) / B. Weber. - Proterozoic fossil content in the Ahlmarmryggen Group, western Queen Maud Land: first preliminary results / B. Weber ; H.-J. Paech. - Geological evolution of the Schirmacher Oasis inclusively surrounding nunataks and the Central Wohlthat Massif (Abstract) / H. Kämpf et al. - Geological setting of the nunataks area south of the Schirmacher Oasis, Central Queen Maud Land / H.-U.Wetzel ; W. Stackebrandt ; K. Hahne. - Mineralizations in Central Queen Maud Land (Abstract) / H. Kämpf et al. - The petrographic characteristics of metamorphics in Queen Maud Land / G. Andrehs ; K. Adam. - Geochemical studies of tillites and boulders in Central Queen Maud Land (Abstract) / K. Hahne et al. - Oxygen isotope geochemistry of pegmatites from a high-grade metamorphic terrain (Schirmacher Oasis, East Antarctica): Preliminary results / Yu. A. Borshchevskiy et al. - Geodetical activities in the vicinity of the Georg Forster Station - Continuation of geodetic research tradition of the GDR in Antarctica / R. Dietrich ; R. Frey ; W. Korth. - Polar lights above the GDR Antarctic station "Georg Forster" (Abstract) / A. Grafe ; C. Kopsch. - Geomagnetical survey of the Schirmacher Oasis and its surroundings / St. Wagner ; C. Kopsch. - Effective offline-processing of complex geomagnetic and ionospheric data / St. Wagner ; V. Strecke. - A new measuring system for registration of geophysical signals on "Georg Forster" based on a 16-bit-multiprocessor structure (Abstract) / R.Rochlitzer Geomagnetic measuring techniques in Antarctica, both in field and stationary operation / C.Kopsch. - Atmospheric Sciences. - Antarctic research on the atmosphere and solar-terrestrial physics / M. J. Rycroft. - The polar ozone depletion in spring as a response to lower stratospheric changes in dynamics and chemistry / H. Gernandt ; P. Gloede. - Ground based aerosol optical thickness measurements in Antarctica from 1984/85 to 1988/89 / U. Leiterer ; A. Herber. - Some problems of the Atmospheric circulation over Antarctica / V. I. Zachariev. - Some results of middle atmosphere research Antarctica, Molodoshnaya station (Abstract) / I. N. Ivanova ; G. A. Kokin ; E. V. Lysenko et al.
    Location: MOP - must be ordered
    Location: AWI Archive
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...