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1

Monographie ausleihbar

A review of Quaternary investigations in Greenland (1975)

Weidick, Anker

Columbus, Ohio : Ohio State Univ., Research Foundation

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Signatur: AWI P8-05-0095

In: Report

In: Miscellaneous papers

Materialart: Monographie ausleihbar

Seiten: XII, 161 S. + 1 Kt.-Beil.

Serie: Report / Insitute of Polar Studies 55

Zweigbibliothek: AWI Bibliothek

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2

Monographie ausleihbar

Vegetation of the Angmagssalik district Souteast Greenland 3 : epilithic macrolichen communities (1975)

Daniëls, F. J. A.

København : Reitzel

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Signatur: ZSP-553-198,3

In: Meddelelser om Grønland

Materialart: Monographie ausleihbar

Seiten: 32 S. : Ill., Kt.

ISBN: 8742101123

Serie: Meddelelser om Grønland 198,3

Sprache: Englisch

Standort: AWI Lesesaal

Zweigbibliothek: AWI Bibliothek

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3

Schriftenreihen ausleihbar

Geophysikalische Aspekte der ostafrikanischen Grabenzonen (1975)

Wohlenberg, Jürgen

Hannover : Schweizerbart

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Signatur: SR 90.0068(4) ; ZSP-320(E,4)

In: Geologisches Jahrbuch

Materialart: Schriftenreihen ausleihbar

Seiten: 82 S.

Serie: Geologisches Jahrbuch : Reihe E 4

Sprache: Deutsch

Standort: Kompaktmagazin unten

Zweigbibliothek: GFZ Bibliothek

Zweigbibliothek: AWI Bibliothek

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4

Schriftenreihen ausleihbar

Wachstumsverhältnisse von Manganknollen : (Vergleichende Untersuchungen zur Wachstumsrate, Magnetisierung, chemische Zusammensetzung und internen Struktur) (1975)

Heye, Dietrich

Hannover : Schweizerbart

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Signatur: SR 90.0068(5) ; ZSP-320(E,5)

In: Geologisches Jahrbuch

Materialart: Schriftenreihen ausleihbar

Seiten: 122 S.

Serie: Geologisches Jahrbuch : Reihe E 5

Sprache: Deutsch

Standort: Kompaktmagazin unten

Zweigbibliothek: GFZ Bibliothek

Zweigbibliothek: AWI Bibliothek

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5

Schriftenreihen ausleihbar

Möglichkeiten der Erkennung und Erfassung von Meereis mit Hilfe von Satellitenbildern (NOAA-2 VHRR) : mit 10 Tabellen (1975)

Ostheider, Monika

München : Geograph. Buchh.

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Signatur: SR 93.0940(18) ; AWI G10-01-0076

In: Münchener geographische Abhandlungen

Materialart: Schriftenreihen ausleihbar

Seiten: 169 S.

ISBN: 3920397770

Serie: Münchener geographische Abhandlungen 18

Sprache: Deutsch

Standort: Kompaktmagazin unten

Zweigbibliothek: GFZ Bibliothek

Zweigbibliothek: AWI Bibliothek

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6

Schriftenreihen ausleihbar

Biological aspects of terrestrial oil spills : USA CRREL oil research in Alaska, 1970-1974 ; [Final Report] (1975)

Deneke, Frederick J. [VerfasserIn] ; McCown, Brent H. [VerfasserIn] ; Coyne, Patrick I. [VerfasserIn] ; [weitere]

Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory

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Signatur: ZSP-202-346

In: Research report / Cold Regions Research and Engineering Laboratory, 346

Beschreibung / Inhaltsverzeichnis: CONTENTS: Abstract. - Preface. - USA CRREL project and personnel involvement. - Part I. Introduction. - Background. - Literature review. - Part II. CRREL investigations from 1970 - 1974. - Initial literature survey (1970). - Oil detection kit development. - Survey of Cape Simpson, Alaska, natural crude oil seepages (1970). - Haines-Fairbanks military pipeline investigations (1971-1973). - Barrow investigations (1970-1974). - Fairbanks and Fox investigations. - Germination studies. - Physiological studies. - Dispersant studies. - Microbiological investigations. - Field investigations of accidental petroleum losses. - Part III. Recent related literature. - Part IV. Conclusions and recommendations. - USA CRREL reports, publications and presentations on Alaska oil spill research. - Literature cited.

Beschreibung / Inhaltsverzeichnis: Knowledge concerning the biological effects of oil pollution on arctic and subarctic terrestrial ecosystems is limited. USA CRREL research personnel conducted investigations from 1970 through 1974 to expand information in this field. Objectives were to: 1) define the ecosystems most sensitive to the presence of crude oil or its refined products, 2) quantify and understand the injury response, and 3) establish time frames for manifestation of damage and natural restorative processes in arctic and subarctic regions. This was accomplished through: 1) surveys of natural oil seepages and past accidential spills in the Arctic and Subarctic, 2) initiation of controlled oil spills and 3) detailed laboratory investigations. Results demonstrated that terrestrial oil spills will to some degree be detrimental to both arctic and subarctic plant communities. Degree and longevity of damage will be influenced primarily by the magnitude of the spill, season of occurrence and existing soil moisture content. Rapid recovery of plant communities subjected to spills will occur only if root systems remain relatively unaffected. Damage will be more extensive and long-term when root systems are saturated with oil. Effects of damage will be manifested gradually over several seasons being influenced by winter stresses. Variation does exist in plant species susceptibility. Carex aquatilis, a predominant sedge of the arctic, is markedly resistant to crude oil damage. In the taiga Picea mariana is very susceptible. Plant recovery can be enhanced through the application of fertilizer. Fertilization, in addition to its direct effect on plant nutrition, will stimulate microbial decomposition of crude oil.

Materialart: Schriftenreihen ausleihbar

Seiten: vii, 66 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory 346

URL: https://apps.dtic.mil/docs/citations/ADA047365

Sprache: Englisch

Standort: AWI Archiv

Zweigbibliothek: AWI Bibliothek

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7

Schriftenreihen ausleihbar

Brine drainage and initial salt entrapment in sodium chloride ice (1975)

Cox, Gordon F. N. [VerfasserIn] ; Weeks, W. F. [VerfasserIn]

Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory

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Signatur: ZSP-202-345

In: Research report / Cold Regions Research and Engineering Laboratory, 345

Beschreibung / Inhaltsverzeichnis: CONTENTS: Abstract. - Preface. - List of symbols. - Introduction. - Previous work. - Experimental design. - The radioisotope 22Na. - Description of apparatus. - Experimental procedure. - Correction of profiles. - Assumptions. - Decay correction. - Boundary correction. - Error analysis. - Results. - Salinity data. - Temperature data. - Growth velocity. - Discussion. - Brine and ice properties. - Brine salinity. - Brine density. - Brine volume. - Brine latent heat of freezing. - Brine viscosity, specific heat, and thermal conductivity. - Ice properties. - Theoretical brine expulsion model. - Continuity equations. - Thermal energy equation. - Simplified brine expulsion equations. - Brine expulsion in NaCl ice. - Results. - Discussion. - Gravity drainage in NaCl ice. - Application of results to natural sea ice. - Effective distribution coefficient. - Previous work. - Experimental procedure and results. - Conclusions. - Literature cited. - Appendix A: Profile correction data. - Appendix B: Program "correct" and sample output. - Appendix C: Tabulation of salinity data. - Appendix D: Tabulation of profile data. - Appendix E: Time-ice thickness equations (Runs 2 and 3). - Appendix F: Tabulation of distribution coefficient data.

Beschreibung / Inhaltsverzeichnis: To obtain a better understanding of the desalination of natural sea ice, an experimental technique was developed to measure sequential salinity profiles of a growing sodium chloride ice sheet. Using radioactive 22Na as a tracer, it was possible to determine both the concentration and movement of the brine within the ice without destroying the sample. A detailed temperature and growth history of the ice was also maintained so that the variation of the salinity profiles could be properly interpreted. Since the experimental salinity profile represented a smoothed, rather than a true salinity distribution, a deconvolution method was devised to restore the true salinity profile. This was achieved without any significant loss of end points. In all respects, the salinity profiles are similar to those of natural sea ice. They have a characteristic C-shape, and clearly exhibit the effects of brine drainage. Not knowing the rates of brine expulsion or gravity drainage, the variation of the salinity profiles during the period of ice growth could be explained by either process. To determine the relative importance of the desalination mechanisms, a theoretical brine expulsion model was derived and compared to the experimental data. As input for the model, equations describing the variation of some properties of NaCl brine with temperature were derived. These included the brine salinity, viscosity, specific heat, thermal conductivity, and latent heat of freezing. The theoretical brine expulsion model was derived by performing mass and energy balances over a control volume of NaCl ice. A simplified form of the model, when compared to the experimental results, indicated that brine expulsion was only important during the first several hours of ice growth, and later became a minor desalination process relative to gravity drainage which continued to be the dominant mechanism for the remainder of the study period (up to 6 weeks). The rate of gravity drainage was found to be dependent on the brine volume and the temperature gradient of the ice. As either the brine volume or temperature gradient was increased, the rate of change of salinity due to gravity drainage increased. The equation commonly used to calculate the effective distribution coefficient (Weeks and Lofgren 1967) was modified and improved by taking brine drainage into account. An expression was also derived to give the distribution coefficient at very low growth velocities.

Materialart: Schriftenreihen ausleihbar

Seiten: vii, 85 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory 345

URL: https://apps.dtic.mil/docs/citations/ADA021765

Sprache: Englisch

Standort: AWI Archiv

Zweigbibliothek: AWI Bibliothek

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8

Schriftenreihen ausleihbar

Work-hardening and strain rate sensitivity of flow stress in high purity ice single crystals (1975)

Parameswaran, V. R. [VerfasserIn] ; Parameswaran, V. R. [VerfasserIn]

Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory

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Signatur: ZSP-202-342

In: Research report / Cold Regions Research and Engineering Laboratory

Beschreibung / Inhaltsverzeichnis: CONTENTS: Abstract. - Preface. - Introduction. - Experimental procedure. - Results. - Work-hardening effect. - Strain rate sensitivity of flow stress. - Discussion. - Conclusions. - Literature cited.

Beschreibung / Inhaltsverzeichnis: 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.

Materialart: Schriftenreihen ausleihbar

Seiten: iii, 11 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 342

URL: https://usace.contentdm.oclc.org/digital/collection/p266001coll1/id/6203

Sprache: Englisch

Zweigbibliothek: AWI Bibliothek

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9

Schriftenreihen ausleihbar

The chemistry of 700 years of precipitation at DYE 3, Greenland (1975)

Cragin, James H. ; Herron, Michael M. [VerfasserIn] ; Langway, Chester C., Jr. [VerfasserIn]

Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory

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Signatur: ZSP-202-341

In: Research report

Beschreibung / Inhaltsverzeichnis: CONTENTS: Abstract. - Preface. - Introduction. - Samples. - Collection. - Preparation. - Analytical methods. - Cations. - Lead, silicon and aluminum. - Sulfate. - Comparative analyses. - Results and discussion. - Sea salt and terrestrial dust. - Sulfate. - Lead. - Summary and conclusions. - Literature cited. - Appendix A. Concentrations of chemical constituents in Dye 3 snow and ice strata.

Beschreibung / Inhaltsverzeichnis: Concentrations of sodium, potassium, magnesium, calcium, silicon, aluminum, lead and sulfate were measured in surface snow and in individual annual accumulation layers from a 373-m-deep ice core from Dye 3, Greenland, covering the time period from 1232 to 1971 A.D. Average background (pre-1840) concentrations in micrograms/liter are: Na, 12.9 ± 9.3; K, 2.2 ± 2.1; Mg, 1.5 ± 1.0; Ca, 4.8 ± 2.4; Si, 12 ± 6; Al, 3.3 ± 1.4; Pb, 0.07 ± 0.06; and SO4, 56 ± 22. Deviations are due mainly to the variability of the concentrations in the samples deposited over the stated time interval rather than analytical precision. Observed concentrations of sodium, potassium, magnesium, calcium, silicon and aluminum can be adequately explained by relative abundances of these elements in seawater andterrestrial dust. Late 19th century annual ice layers contain twice as much sulfate as pre-1840 deposits, reflecting the increased use of fossil fuels in the Northern Hemisphere. Lead concentrations in post-1955 snow deposits are more than an order of magnitude greater than pre-1840 baseline concentrations and are attributed to smelting and the increased use of lead alkyls in gasoline.

Materialart: Schriftenreihen ausleihbar

Seiten: v, 18 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 341

URL: https://babel.hathitrust.org/cgi/pt?id=uc1.31210025592088&seq=1

Sprache: Englisch

Zweigbibliothek: AWI Bibliothek

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10

Schriftenreihen ausleihbar

The bearing capacity of floating ice plates subjected to static or quasi-static loads : a critical survey (1975)

Kerr, Arnold D. [VerfasserIn]

Hanover, NH : Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory

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Signatur: ZSP-202-333

In: Research report

Beschreibung / Inhaltsverzeichnis: CONTENTS: Preface. - Introduction. - Analogy method. - Method based on the bending theory of elastic plates and the criterion [Sigma]max = [Sigma]f. - Methods based on viscoelastic theories. - Methods based on the yield line theory or limit analysis. - Comparison of analytical and test results. - General remarks. - Effect of bending and shearing forces on deflection of an ice cover. - Determination of Pf(O). - Determination of Pf(t). - Determination of [Sigma]f. - Summary and recommendations. - Literature cited.

Beschreibung / Inhaltsverzeichnis: This report contains a critical survey of the literature on the bearing capacity of floating ice plates. It consists of a discussion of general questions, a critical survey of analytical attempts to determine the bearing capacity of floating ice plates, and a survey of field and laboratory tests on floating ice plates and their relation to the analytical results. The paper concludes with a systematic summary of the results, a discussion of observed shortcomings, and suggestions for needed investigations.

Materialart: Schriftenreihen ausleihbar

Seiten: iv, 43 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 333

URL: http://www.worldcat.org/oclc/1387849

Sprache: Englisch

Zweigbibliothek: AWI Bibliothek

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