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  • 1
    Call number: AWI G4-92-0251
    In: Developments in hydrobiology
    Description / Table of Contents: Contents: Preface / by W. F. Vincent and J. C. Ellis-Evans. - RIVERS AND STREAMS Filamentous green algae in freshwater streams on SignyIsland, Antarctica / by I. Hawes. - The effects of nutrient limitation and stream discharge on the epilithic microbial community in an oligotrophic Arctic stream / by M. A. Hullar and J. R. Vestal. - Microbial communities in southern Victoria Landstreams (Antarctica) I. Photosynthesis / by C. Howard-Williams and W. F. Vincent. - Microbial communities in southern Victoria Landstreams (Antarctica) II. The effects of low temperature / by W. F. Vincent and C. Howard-Williams. - Nitrogen dynamics in two antarctic streams / by C. Howard-Williams, J. C. Priscu and W. F. Vincent. - Benthic algal biomass and productivity in high subarctic streams, Alaska / by J. D. LaPerriere, E. E. Van Nieuwenhuyse and P. R. Anderson. - Broadscale patterns in the distribution of aquatic and terrestrial vegetation at three ice-free regions on Ross Island, Antarctica / by P. A. Broady. - Community structure of benthic invertebrates in interior Alaskan (USA) streams and rivers / by M. W. Oswood. - Variability of macroinvertebrate community composition in an arctic and subarctic stream / by M. C. Miller and J. R. Stout. - Geochemical processes in the Lake Fryxell Basin (Victoria Land, Antarctica) / by W. J. Green, T. J. Gardner, T. G. Ferdelman, M. P. Angle, L. C. Varner and P. Nixon. - LAKES AND PONDS. - Some aspects of iron cycling in maritime antarctic lakes / by J. C. Ellis-Evans and E. C. G. Lemon. - Nitrogen cycling in Arctic lakes and ponds / by V. Alexander, S. C. Whalen and K. M. Klingensmith. - Photon dependence of inorganic nitrogen transport by phytoplankton in perennially ice-covered Antarctic lakes / by J. C. Priscu. - Patterns of energy storage in Pseudoboeckella poppei (Crustacea, Copepoda) from two contrasting lakes on SignyIsland, Antarctica / by A. Clarke, J. C. Ellis-Evans, M. W. Sanders and L. J. Holmes. - Tundra ponds of the Yukon Delta, Alaska, and their macroinvertebrate communities / by J. A. Maciolek. - Vertical distributions of a planktonic harpacticoid and a calanoid (Copepoda) in a meromictic Antarctic lake / by I. A. E. Bayly and D. Eslake. - Physico-chemical characteristics and origin of hypersaline meromictic Lake Garrow in the Canadian High Arctic / by M. Ouellet, M. Dickman, M. Bisson and P. Page. - Meromixis in an Antarctic fjord; a precursor to meromictic lakes on an isostatically rising coastline / by J. B. Gallagher, H. R. Burton and G. E. Calf. - Chemical characteristics of pond waters in the Labyrinth of southern Victoria Land, Antarctica / by T. Torii, S. Nakaya, O. Matsubaya, G. I. Matsumoto, N. Masuda, T. Kawano and H. Murayama. - Biogeochemical study of organic substances in Antarctic lakes / by G. I. Matsumoto. - Vertical distribution of organic constituents in an Antarctic lake: Lake Fryxell by G. I. Matsumoto, K. Watanuki and T. Torrii. - Perennially ice-covered Lake Hoare, Antarctica: physical environment, biology, and sedimentation by R. A. Wharton Jr, G. M. Simmons Jr and C. P. McKay. - Geographical index. - Map index.
    Description / Table of Contents: Scientific interest in the Antarctic continues to accelerate and limnological research in the area is expanding accordingly. Continued commercial exploitation of mineral resources in the Arctic and the potential for similar developments in the Antarctic have heightened environmental concern and the need for ecological information. This volume brings together limnologists from both polar zones to draw attention to the distinctive features that high latitude aquatic ecosystems have in common, and to the marked contrasts between and within each zone. Twenty-two papers encompass a broad range of new research including the unique geochemistries, insect and zooplankton dynamics, algal community structure and growth characteristics, and microbial ecology of high latitude lakes and rivers. The volume will be a reference source for limnologists and other environmental scientists with an interest in high latitude waters, and for those involved in environmental impact assessments in Antarctica or the Arctic.
    Type of Medium: Monograph available for loan
    Pages: 322 S. : graph. Darst.
    ISBN: 9061936608
    Series Statement: Developments in hydrobiology 49
    Branch Library: AWI Library
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  • 2
    Call number: MOP Per 301/C(20)
    In: CSIRO Division of Atmospheric Research technical paper
    Type of Medium: Monograph available for loan
    Pages: 31 S. : graph. Darst.
    ISBN: 0643051112
    Series Statement: CSIRO Division of Atmospheric Research technical paper 20
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Boston [u.a.] : Little, Brown
    Call number: O 4540
    Type of Medium: Monograph available for loan
    Pages: 477 S. : Ill.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Microsystem technologies 3 (1997), S. 145-154 
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract  In recent years, developments in the micro electronics industry have focused on semiconductors and semiconductor processes. However, microcircuit assembly technologies have lagged chip development. This has spurred research in interconnection and packaging creating many new technologies and enhancing integration. These new microelectronic technologies are enabling micro systems, and resulting in products, from portable work stations to advanced automotive electronics. This evolution of technology has also created the need to reexamine how we achieve a reliable system. Clearly, in highly competitive marketplaces, reliability is a key element in achieving successful products. To achieve a reliable product in a cost effective manner, “upstream problem solving” must be employed which focuses on root cause of failure. This paper provides an overview of the reliability assessment process needed to achieve effective microsystem development. A case study of reliability in a complex multi-chip module is presented which includes an assessment of the stochastic nature of via fatigue by applying Monte Carlo simulations.
    Type of Medium: Electronic Resource
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  • 5
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    Unknown
    Geological Society, London
    In:  EPIC3Atlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient, Geological Society, London, Memoirs 46, London, Geological Society, London, pp. 263-264
    Publication Date: 2017-06-01
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 6
    Publication Date: 2016-07-08
    Description: The marine sedimentary record in Kejser Franz Joseph Fjord and on the East Greenland continental margin contains a history of Late Quaternary glaciation and sedimentation. Evidence suggests that a middle-shelf moraine represents the maximum shelfward extent of the Greenland Ice Sheet during the last glacial maximum. On the upper slope, coarse-grained sediments are derived from the release of significant quantities of iceberg-rafted debris (IRD) and subsequent remobilization by subaqueous mass-flows. The middle-lower slope is characterized by hemipelagic sedimentation with lower quantities of IRD (dropstone mud and sandy mud), punctuated episodically by deposition of diamicton and graded sand/gravel facies by subaqueous debris flows and turbidity currents derived from the mass failure of upper slope sediments. The downslope decrease of IRD reflects either the action of the East Greenland Current (EGC) confining icebergs to the upper slope, or to the more ice-proximal setting of the upper slope relative to the LGM ice margin. Sediment gravity flows on the slope are likely to have fed into the East Greenland channel system, contributing to its formation in conjunction with the cascade of dense brines down the slope following sea-ice formation across the shelf.Deglaciation commenced after 15 300 14C years , as indicated by meltwater-derived light oxygen isotope ratios. An abrupt decrease in both IRD deposition and delivery of coarse-grained debris to the slope at this time supports ice recession, with icebergs confined to the shelf by the EGC. Glacier ice had abandoned the middle shelf before 13 000 14C years with ice loss through iceberg calving and deposition of diamicton. Continued retreat of glacier-ice from the inner shelf and through the fjord is marked by a transition from subglacial till/bedrock in acoustic records, to ice-proximal meltwater-derived laminated mud to ice-distal bioturbated mud. Ice abandoned the inner shelf before 9100 14C years and probably stabilized in Fosters Bugt at 10 000 14C years . Distinct oxygen isotope minima on the inner shelf indicate meltwater production during ice retreat. The outer fjord was free of ice before 7440 14C years . Glacier retreat through the mid-outer fjord was punctuated by topographically-controlled stillstands where ice-proximal sediment was fed into fjord basins. The dominance of fine-grained, commonly laminated facies during deglaciation supports ablation-controlled, ice-mass loss.Glacimarine sedimentation within the Holocene middle-outer fjord system is dominated by sediment gravity flow and suspension settling from meltwater plumes. Suspension sediments comprise mainly mud facies indicating significant meltwater-deposition that overwhelms debris release from icebergs in this East Greenland fjord system. The relatively widespread occurrence of fine-grained lithofacies in East Greenland fjords suggests that meltwater sedimentation can be significant in polar glacimarine environments. The ice-distal continental margin is characterized by meltwater sedimentation in the inner shelf deep, iceberg scouring over shallow shelf regions, winnowing and erosion by the East Greenland Current on the middle-outer shelf, and hemipelagic sedimentation on the continental slope.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 7
    Publication Date: 2018-08-10
    Description: Marine geoscience data indicate that during the Last Glacial Maximum (LGM) grounded ice extended to the shelf edge along most, if not all, of the 2500 km-long continental margin from the northern Antarctic Peninsula to the Amundsen Sea. Past extent of grounded ice is indicated by swath bathymetry data from the outer parts of cross-shelf troughs, which reveal relict elongated subglacial bedforms. The bedforms show that the troughs were paths of fast-flowing (streaming) ice. Geomorphological evidence regarding the nature of ice flow over intervening outer shelf banks has been erased through pervasive post-glacial ploughing by icebergs. However, seismic profiles across the banks reveal widespread shelf edge progradation and numerous glacial unconformities that indicate grounded ice has extended across them many times during the Pleistocene, and before. Subglacial tills in the outer parts of shelf troughs are overlain by up to 2 m of postglacial sediments, which are no older than the LGM in any core yet dated. A layer of soft, intermediate shear strength (12¬25 kPa) till, interpreted as deformation till, underlies the postglacial sediments in cores in the troughs. These observations are consistent with the interpretation that streaming ice extended along the troughs during the LGM, but the duration of such flow, and whether or not it spanned the entire period when ice extended to the outer shelf remains undetermined.To determine when, and how rapidly, ice retreated from the continental shelf, ages of core samples from near the base of postglacial sediments in several troughs have been determined by AMS radiocarbon dating. Samples to constrain glacial retreat have been taken from either the base of muds deposited in seasonally open-marine conditions similar to today, or underlying sandy muds interpreted as having been deposited close to the grounding line. Modern sea-floor sediments on some parts of the margin contain sufficient calcareous microfossils for dating to constrain the local marine 14C reservoir correction. However, even where they occur, contents of planktonic foraminifera decrease downcore, and most deglaciation ages have been obtained from acid insoluble organic material (AIOM). In some areas these ages are significantly affected by reworked fossil carbon, as shown by apparent ages from AIOM in modern sea-floor sediments that range up to ~6000 years. Thus radiocarbon results from this margin must be treated with caution and there is a clear need for development of alternative dating methods.Notwithstanding these uncertainties, deglaciation ages obtained thus far suggest variable retreat histories along the margin. Results from the Antarctic Peninsula shelf and Amundsen Sea embayment suggest relatively rapid post-LGM ice retreat from the outer and middle shelf, followed by slower Holocene retreat to the present day ice margin. However, initial results from the Bellingshausen Sea (Belgica Trough) suggest a slower, progressive retreat commencing about 25 ka (corrected radiocarbon years). These results show that local factors are important in controlling the rate of ice retreat, and this needs to be taken into account in numerical models that attempt to predict the dynamic behaviour of large ice sheets.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
    Publication Date: 2014-11-08
    Description: The North-East Greenland ice stream reaches about 700 km inland and drains a major part of the Greenland ice sheet via marine terminating glaciers at the western edge of the North-East Greenland Continental Shelf (NEGCS). Previous studies suggested that, during full-glacial periods, the ice sheet only extended to the inner shelf and did not reach further to the east. Based on radiocarbon dating data it was hypothesized that the Greenland Ice Sheet reached onto the middle shelf or even the shelf edge. An advance at least to the middle shelf at about 79.5 to 80.5° N was later demonstrated by two studies using new high-resolution swath bathymetric data that showed seafloor features, including mega-scale glacial lineations and retreat moraines, indicating past ice stream activity. These data, however, only provided a fragmented picture of the behaviour of this North-East sector of the Greenland ice sheet, with the majority of the NEGCS area unmapped. Now, we have newly processed bathymetric data from R/V Polarstern that was acquired in the area of the NEGCS from 76° to 81° N throughout the last 25 years. In addition we include processed data collected by other institutions. In total, swath bathymetric data from 26 cruises has been investigated for glacigenic seafloor features. All glacigenic seafloor features have been mapped to provide a holistic overview of the area. We present the current stage of our investigation. It shows that glacial activity on the NEGCS was far more intense than previously estimated and that the ice sheet extended even further offshore.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
    Publication Date: 2018-08-10
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 2 (1963), S. 372-375 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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