X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Cold Regions Research and Engineering Laboratory 〈Hanover, NH〉
  • 1
    Buch
    Buch
    Determination of cation exchange capacity of earth materials using a radiotracer technique (1970)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ123371
    Umfang: iii, 12 Seiten , Illustrationen
    Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 283
    Inhalt: CONTENTS: Introduction. - Determination of CEC of earth materials using isotopic exchange. - Determination of CEC of earth materials using isotopic labeling. - Appendix: Procedure for determination of CEC of earth materials by isotopic labeling.
    Inhalt: Two radiochemical methods were investigated for determining the cation exchange capacity of earth materials having a wide range in physicochemical properties. The first method attempted was unsuccessful but involved determination of the radioactivity of a 22Na-NaOAc solution in isotopic equilibrium with a Na+-saturated mineral phase. The logic of this method is presented in order to illustrate principles of isotopic exchange in mineral systems. The method finally adopted is based upon determination of the radioactivity of a salt-free, Na+-saturated mineral sample prepared using a radioactive NaOAc solution with a known 22Na-NaOAc composition. This method is less time-consuming and more accurate than the conventional ammonium acetate method for cation exchange capacity determinations.
    Anmerkung: MAB0014.001: ZSP-202-283 , Online frei verfügbar
    In: Research report
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: http://www.worldcat.org/oclc/5975372
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 2
    Buch
    Buch
    Gamma-ray spectra of resonance neutron irradiated earth materials (1970)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ123364
    Umfang: iii, 27 Seiten , Illustrationen
    Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 289
    Inhalt: CONTENTS: Introduction. - Materials and methods. - Materials. - Methods. - Results and discussion. - Literature cited. - Appendix A.
    Inhalt: Clay mineral and soil samples were subjected to neutron activation analysis in order to identify and measure the abundances of trace elements having radionuclides with long half-lives. After exposure of cadmium-shielded samples to neutrons for a period of five days, the gamma radiation associated with the decay of the resulting radionuclides was observed using a high resolution Ge(Li) detector. Trace elements identified without prior chemical separation using the gross gamma-ray spectra included Fe, Zn, Ti, Ni, Co, Cr, Sr, Ba, Ca, La, Eu, Tb, Hf, Ta, Th, and U. It should be possible to determine quantitatively the amount of each of these elements. This is a considerable improvement over the number of elements determined in soils previously by activation analysis without destructive chemical treatments.
    Anmerkung: MAB0014.001: ZSP-202-289 , Online frei verfügbar
    In: Research report
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: http://www.worldcat.org/oclc/5974517
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 3
    Buch
    Buch
    Work-hardening and strain rate sensitivity of flow stress in high purity ice single crystals (1975)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ122938
    Umfang: iii, 11 Seiten , Illustrationen
    Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 342
    Inhalt: CONTENTS: Abstract. - Preface. - Introduction. - Experimental procedure. - Results. - Work-hardening effect. - Strain rate sensitivity of flow stress. - Discussion. - Conclusions. - Literature cited.
    Inhalt: Single crystals of high purity ice deformed by uniaxial compression on an Instron machine showed remarkable work-hardening after about 8% strain. By changing the strain rate during compression tests in the plastic region of the stress-strain curve, an apparent activation volume V* and a dislocation mobility exponent m were calculated from the strain rate sensitivity of flow stress. The large work-hardening and the rapid increase in the value of m beyond about 10% strain indicate that the plastic flow in this region is controlled by dislocation intersections and nonconservative motion of jogs.
    Anmerkung: MAB0014.001: ZSP-202-342 , Online frei verfügbar
    In: Research report / Cold Regions Research and Engineering Laboratory
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://usace.contentdm.oclc.org/digital/collection/p266001coll1/id/6203
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 4
    Buch
    Buch
    Defensive works of subarctic snow (1977)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20191029155757
    Umfang: vi, 23 Seiten , Illustrationen
    Serie: CRREL Report 77-6
    Inhalt: It has been reported that small arms projectiles are inherently unstable in snow and that snow has an unexpectedly high ability to stop them and other fast-moving projectiles. Field tests showed that the typical subarctic snow of interior Alaska can be used effectively to provide protection from both rifle and machine gun fire. The undisturbed snow had an average density of 0.18 g/cu. cm., but simple processing, such as shoveling, increased the density to around 0.34 g/cu. cm. Further processing increased the density to above o.40 g/cm3 but densities much above that value were difficult to obtain with simple hand equipment. Tests of the M16 rifle and M60 and M2HB machine guns showed that bullet penetration was inversely related to density - the higher the density the lower the bullet penetration. Design values for the three weapons were determined. A number of types of snow trenches and structures were designed and tested. They were found to provide good protection, in part since bullets showed a strong tendency to ricochet from the snow surface when striking it at a low angle. Burlap bags were filled with snow to revet structures and worked very well. Several types of Russian defensive works of snow were tested but proved unsuitable in the light, weak subarctic snow. The times required for troops to build several types of structures using only shovels and scoops were recorded.
    Anmerkung: CONTENTS Abstract Preface Summary Background Objectives Subarctic snow General Snow processing Construction productivity Shovel capacity Snow piles Bullet behavior and penetration in snow Test procedure M16 M60 ball M60 tracers .50 caliber Tumbling Bullet deformation and breakage Design penetration values Defensive works of snow Revetments Snow bags The snow trench The hardened snow trench Breastworks and bunkers Evaluation of foreign technology Russian expedient snow trenches Snow blocks and block structures The snow arch An expedient shelter Conclusions Recommendations Literature cited
    In: CRREL Report, 77-6
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://hdl.handle.net/11681/9486
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 5
    Buch
    Buch
    Studies of the age hardening of processed snow (1962)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20210120153233
    Umfang: iv, 12 Seiten , Illustrationen
    Serie: Research report / Cold Regions Research and Engineering Laboratory 99
    Inhalt: Summary: A study of how age hardening affects the various mechanical properties of processed snow was made. A description of how the age hardening process is affected by the variables of density, temperature, grain size, and shape is given. An empirical equation relating creep rate to stress, age, and density was obtained. The study also shows that the various mechanical properties are related to age by an exponential function.
    Anmerkung: CONTENTS Preface Summary Introduction Experimental facilities Experimental in-place measurements Density and homogeneity of processed snow Ram hardness Temperature measurements Mechanical properties Unconfined compressive strength Stress-strain relationships in unconfined compress ion Creep in unconfined compression Tensile strength Discussion of results References
    In: Research report / Cold Regions Research and Engineering Laboratory, 99
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://hdl.handle.net/11681/5900
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 6
    Buch
    Buch
    Model for avalanches in three spatial dimensions : comparison of theory to experiments (1994)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20190905155151
    Umfang: iv, 29 Seiten , Illustrationen
    Serie: CRREL Report 94-5
    Inhalt: 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.
    Anmerkung: 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
    In: CRREL Report, 94-5
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://apps.dtic.mil/dtic/tr/fulltext/u2/a283989.pdf
    URL: https://hdl.handle.net/11681/9396
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 7
    Buch
    Buch
    Roof leaks in cold regions : school at Chevak, Alaska (1980)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20200929101314
    Umfang: iv, 12 Seiten , Illustrationen
    Serie: CRREL Report 80-11
    Inhalt: Four types of roof leaks occurred at a new school building in Chevak, Alaska: 1) blowing snow entered the roof through eave vents and then melted, 2) slush and ice in roof valleys caused meltwater to overflow the valley flash­ing and run into the building, 3) water entered at a roof/wall intersection and 4) in many areas water entered through gaps in the sloping plywood deck. Sealing the eave vents made it impossible for blowing snow to enter the roof at the eaves. Electric heat tapes eliminated the valley icing problem. Missing flashing was responsible for the roof/wall intersection leaks. The absence of a vapor barrier in the roof was the cause of many leaks. We recom­mended that the roof be repaired from the exterior by removing component elements down to the plywood deck,installing an adhered continuous vapor barrier and reassembling the roof. An alternative roof cladding of compos­ition shingles was discussed as was conversion to a “cold roof.” The roof was repaired and modified following our recommendations, and problems appear to have been solved.
    Anmerkung: CONTENTS Abstract Preface Conversion factors Introduction Description of school Roof problems Snow infiltration leaks Valley leaks Intersection leaks Condensation leaks Tests to verify the cause of condensation leaks Eliminating the condensation leaks Recommendations for eliminating condensation leaks Repairing existing roof An alternative roof cladding The "cold roof" alternative Repairs and modifications Summary and conclusions
    In: CRREL Report, 80-11
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://cdm16021.contentdm.oclc.org/digital/collection/p266001coll1/id/6434
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 8
    Buch
    Buch
    Quantitative data from a patterned ground site over permafrost (1965)
    Hanover, NH : Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZBV026646590
    Umfang: VI, 76 Seiten , Illustrationen
    Serie: Research report / Cold Regions Research and Engineering Laboratory 96
    Inhalt: Techniques were established by which quantitative data can be obtained from patterned ground features. The field work was carried out during the summers of 1954 and 1955 near Camp Tuto, Greenland. The investigation site is described, and extensive data are presented. The soil materials composing the patterned ground features were found to be of common mineralogy, grain size distribution, and plasticity. The chemical nature of the soils does not contribute to feature formation; it is the mechanical processes acting on these materials that are important. A sharp rise in the soil water content in the form of ice was consistently noted when passing through the base of the active layer into the present permafrost. A net heave occurred at both feature center and border locations, The magnitude of the heave is about 0.05 ft for the centers and 0.03 ft for the borders. Feature age was estimated to be about 150 yr. Vertical sorting occurs over the entire depth of the active layer but radial sorting is confined to the upper 2 ft. Groundwater flow occurs mostly through the feature borders, and incoming radiation has an important effect on the progression of the frost line. The progression of thaw is very rapid and, by the end of summer, the thaw penetration is greatest under the feature centers.
    Anmerkung: CONTENTS Preface Summary Introduction Site of investigation Selection of study area General information about site and vicinity Accumulation and initial evaluation of data Feature 1 - preliminary study (raised center feature) Feature 2 - bench mark excavation - preliminary soils study (depressed center feature) Feature 3 - cobble orientation study Feature 4 - precise movement survey Feature 5 - radial comparison studies Feature 6 - moisture content survey Feature 7 - temperature and heat flow study (depressed center feature) Feature 8 - temperature and heat flow study (raised center feature) Feature 9 - ground water table studies Features 10 and 11 - permafrost table survey (depressed and raised center features) Combined analysis of data Sharp rise in water content at frost table Estimate of heave since deposition Study of heave measurements Consideration of feature formation time Soil grain size distribution within features Conclusions Recommendations for future work in this or similar patterned ground study areas Heave and ground-ice accumulation Solifluction ground flow Incoming radiation and soil albedo References Appendix A: General. study of heat budget of the active layer
    In: Research report / Cold Regions Research and Engineering Laboratory, 96
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://hdl.handle.net/11681/22899
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 9
    Buch
    Buch
    Physical and structural characteristics of Weddel Sea pack ice (1987)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20190717115151
    Umfang: iv, 80 Seiten , Illustrationen
    Serie: CRREL Report 87-14
    Inhalt: During February and March 1980 the physical properties of Weddell Sea pack ice were investigated via core drilling of 66 floes located along the transect of 600 nautical miles from 64°S to 74°S latitude at roughly 40°W longitude. These studies revealed widespread frazil ice in amounts not known to exist in Arctic sea ice of comparable age and thickness. It is estimated from structure studies of 62 of the 66 floes that 54% of the total ice production of the Weddell Sea is generated as frazil. The disposition and exceptional thickness of the frazil show that mechanisms other than surface turbulence effects are involved and imply that the circulation and structure of the water in the upper levels of the Weddell Sea are significantly different from those in the Arctic basin. Salinities of both first-year and multi-year floes are notably higher than those of their Arctic counterparts because summer surface melting is rare or absent in the Weddell Sea; in the Arctic, downward percolating meltwater flushes through the ice and lowers its salinity. Fluorescence was evaluated as a means of revealing biological activity in Weddell Sea pack ice. It proved useful as an index of combined living and dead material in the ice, but measurements failed to establish any consistent relationship between fluorescence and salinity as suggested be earlier work in the Weddell Sea.
    Anmerkung: CONTENTS Preface Introduction Sea ice structure and classification Logistics and field operations Analytical techniques Crystalline structure Fluorescence Results Salinity Crystalline structure Fluorescence Description of selected floes Conclusions Literature cited Appendix A: Floe descriptions
    In: CRREL Report, 87-14
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://apps.dtic.mil/docs/citations/ADA188189
    URL: https://hdl.handle.net/11681/9036
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
  • 10
    Buch
    Buch
    Comparison of soil freezing curve and soil water curve data for Windsor sandy loam (1988)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Dazugehörige Titel
    Details
    UID:
    kobvindex_GFZ20190724154444
    Umfang: iii, 42 Seiten , Illustrationen
    Serie: CRREL Report 88-16
    Inhalt: Unfrozen water content as a function of temperature was measured in the laboratory using nuclear magnetic resonance (NMR) for a Windsor sandy loam soil. The data were related to previously measured soil moisture retention data through the modified Clapeyron equation with suitable adjustment for surface tension. The results show the usefulness of extending the soil freezing curve to temperatures only slightly below freezing and the soil water curve to very great suction.
    Anmerkung: CONTENTS Abstract Preface Introduction Soil variable ø SWC and SFC similarity Mathematical representation of SWC and SFC data NMR measurement of unfrozen water content Characterization of SWC Discussion Conclusions Literature cited Appendix A: Soil freezing curve data Appendix B: Error analysis Appendix C: Soil water curve data
    In: CRREL Report, 88-16
    Sprache: Englisch
    Schlagwort(e): Forschungsbericht
    URL: https://apps.dtic.mil/dtic/tr/fulltext/u2/a202365.pdf
    URL: https://hdl.handle.net/11681/9072
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Buch
    Wissenschaftspark Albert Einstein get availability status
Nichts oder nicht das Richtige gefunden? Bitte überprüfen Sie Ihre Suchanfrage oder benutzen Sie den Fernleihindex.
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie auf den KOBV Seiten zum Datenschutz