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  • 2010-2014  (854)
  • 1975-1979  (116)
  • 1945-1949  (4)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Paris : L'Harmattan
    Call number: AWI P5-14-0014 ; AWI P5-14-0013
    Description / Table of Contents: Contents: Preface: The Arctic and the Configuration of the Stars / Alain Faure. - Introduction: The Arctic, Innovative Thinking for a New Region? / Cécile Pelaudeix. - Towards an ice-free Arctic Ocean? / Jérôme Weiss. - Iggiagruk is my Inupiaq name / William l. Iggiagruk Hensley. - Canadian Arctic Security and ClimateChange: Going Beyond a Traditional Security Approach / Heather N. NicolInuit. - Governance in a Changing Environment: a Scientific or a Political Project? / Cécile Pelaudeix. - Indigenous peoples of Russia as political actors / Natalie Novik. - Sustainable Development and the Greening of Sovereignty in the Canadian Arctic / Paule Halley & Marie-Eve Mercier. - Continental Shelves and Maritime Boundaries in the Arctic: the New Cold War Will Not Take Place / Frédéric Lasserre. - Towards a Common Polar NavigationCode: when the Antarctic and the Arctic Converge / Anne Choquet. - Economic activities in the Arctic Ocean: Universal, Regional and National Regulation / Alexander N. Vylegzhanin. - Northern Geopolitics in Flux: From a frontier mentality to peaceful cooperation / Lassi Heininen. - International and Regional Regulation of the Arctic: is there a role for theEuropean Union? / Clive Archer. - Concluding Remarks: The New Mediterranean / Robert Howell Griffiths.
    Description / Table of Contents: The Arctic region is undergoing dramatic transformation. Rapid change due to climate warming is currently affecting the Arctic more than any other region in the world: the permafrost is melting, glaciers are receding, the sea ice is shrinking. With the melting of ice, the circumpolar region is subject to increasing forces of globalization, and navigation through the Northwest and the Northeast passages is rapidly emerging as a practical and commercial proposition. Moreover, the Arctic may be home to 30 per cent of the planet's undiscovered natural gas reserves and 13 per cent of its undiscovered oil. "What holds the Arctic together?" The emphasis here is on convergence, rather than divergence, the Arctic's centrality not its eccentricity. The contributions gathered together in this book all address essential questions posed by geophysicists, political scientists, jurists, geographers and historians. How can science calculate and assess the scale of change in this geographic space, in particular concerning the melting of ice? To what extent are the native populations listened to and act as active participants in decision-making concerning the Arctic? In the context of post-Cold War international and regional cooperation, what is the present state of Arctic governance? How are the Arctic States themselves cooperating in facing the challenges that lie ahead? Are existing juridical arrangements adequate? What role in the Arctic can be played by actors such as the European Union? To what extent are other powerful countries, such as the Asian giants, taking a direct interest in the development of the Arctic?
    Type of Medium: Monograph available for loan
    Pages: 193 S. : Ill., graph. Darst., Kt.
    ISBN: 9782296992191
    Series Statement: Logiques politiques
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 2
  • 3
    Publication Date: 2010-07-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 4
    Publication Date: 2020-02-12
    Description: The southern Hikurangi Subduction Margin is characterized by significant accretion with predicted high rates of fluid expulsion. Bottom simulating reflections (BSRs) are widespread on this margin, predominantly occurring beneath thrust ridges. We present seismic data across the Porangahau Ridge on the outer accretionary wedge. The data show high-amplitude reflections above the regional BSR level. Based on polarity and reflection strength, we interpret these reflections as being caused by free gas. We propose that the presence of gas above the regional level of BSRs indicates local upwarping of the base of gas hydrate stability caused by advective heatflow from upward migrating fluids, although we cannot entirely rule out alternative processes. Simplified modelling of the increase of the thermal gradient associated with fluid flow suggests that funnelling of upward migrating fluids beneath low-permeability slope basins into the Porangahau Ridge would not lead to the pronounced thermal anomaly inferred from upwarping of the base of gas hydrate stability. Focussing of fluid flow is predicted to take place deep in the accretionary wedge and/or the underthrust sediments. Above the high-amplitude reflections, sediment reflectivity is low. A lack of lateral continuity of reflections suggests that reflectivity is lost because of a destruction of sediment layering from deformation rather than gas-hydrate-related amplitude blanking. Structural permeability from fracturing of sediments during deformation may facilitate fluid expulsion on the ridge. A gap in the BSR in the southern part of the study area may be caused by a loss of gas during fluid expulsion. We speculate that gaps in otherwise continuous BSRs that are observed beneath some thrusts on the Hikurangi Margin may be characteristic of other locations experiencing focussed fluid expulsion.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 10 (1976), S. 1002-1005 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 26 (1979), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The isotopic composition of strontium in surface water in continental basins is determined primarily by the geology of the basin and to a lesser extent by climatic conditions. Consequently, the 87Sr/86Sr ratios of brines in such basins can change only as a result of changes in the geology or climate. This principle of isotope geology was studied by analysis of a suite of non-marine carbonate rocks from the Flagstaff Formation (Palaeocene-Eocene) of Utah. The samples were collected from a section in Fairview Canyon of Sanpete County. They include both limestone and dolomite and were selected to have low non-carbonate residues. The concentrations of strontium in calcites averages 383 ± 128 p.p.m., while those of dolomites increase from 354 ± 74 p.p.m. in the lower 43 m of section to a maximum of 2259 p.p.m. higher up. The increase in the strontium content of dolomite is interpreted as evidence for a change from steady-state to progressively more evaporitic conditions. Two dolomites have isotopic compositions of oxygen expressed as δ18O = -2.75‰ (relative to the PDB standard) and are enriched in 18O relative to two calcites whose average δ18O value is -9.9‰. The 87Sr/86Sr ratios of the carbonate minerals range from 0.70890 to 0.71260. These values are clearly greater than the 87Sr/86Sr ratio of marine carbonates of Early Eocene age which is 0.70744. The variation of the 87Sr/86Sr ratio in this section of the Flagstaff Formation is real and reflects the occurrence of geological events which changed the isotopic composition of Sr entering Lake Flagstaff. The non-carbonate fractions of six carbonate rocks and one sandstone fit a straight line on the strontium mixing diagram in co-ordinates of initial 87Sr/86Sr and 1/Sr concentration. These results suggest that the isotopic composition of strontium in Lake Flagstaff may have been modulated by periodic input of volcanogenic detritus of felsic composition.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 25 (1978), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The 87Sr/86Sr ratios and strontium concentrations for thirty-three samples of marine carbonate rocks of Middle Triassic to Early Jurassic age have been determined. The samples were collected from four measured sections in the areas of Val Camonica in northern Italy. The strontium concentrations vary from 40 to 7000 ppm. Most of the samples are calcitic limestones containing less than 10% of non-carbonate residues. Dolomitic samples and those containing appreciable non-carbonate residues have significantly diminished strontium concentrations. 87Sr/86Sr ratios of the carbonate phases of these rocks appear to be unaffected by dolomitization and by the presence of non-carbonate minerals. The average 87Sr/86Sr ratios of the formations vary systematically in a stratigraphic sense. The ratio increased from Early Anisian to Early-Middle Ladinian, declined during Late Ladinian and Carnian, rose again during the Norian and then declined throughout the Late Norian (Rhaetian), Hettangian, Sinemurian and Pliens-bachian ages. The average 87Sr/86Sr ratios, relative to 0.7080 for the Eimer and Amend standard, are: Anisian: 0.70805 ± 00019; Early Ladinian: 0.7085 ± 0.00038; Late Ladinian: 0.70791 ± 0.00013; Carnian: 0.70776 ± 0.00015; Norian and Rhaetian: 0.70791 ± 0.00014; Hettangian: 0.70762 ± 0.00021; Sinemurian: 0.7070 ± 0.00038; Pliensbachian: 0.7070 ± 0.00015. These variations reflect changes in the isotopic composition of Sr entering the oceans in early Mesozoic time due to varying rates of weathering and erosion of young volcanic rocks (low 87Sr/86Sr) and old granitic rocks (high 87Sr/86Sr). The data presented in this report contribute to a growing body of information regarding the changes that have occurred in the 87Sr/86Sr ratio of the oceans in Phanerozoic time.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 400-401 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The unit-cell parameters and indexed powder patterns are reported for the title compounds. Both these compounds are new; they crystallize in the triclinic system.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 366-367 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The title compound crystallizes in the triclinic system. The unit-cell data are a = 5.961 (6), b = 8.641 (9), c = 10.752 (7) Å, α = 94.95 (8), β = 88.38 (9), γ = 109.66 (8)°, Z = 2: Dm = 2.08, Dx = 2.10 g cm−3. The indexed powder pattern is given.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 493-494 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The copper(II) methanesulphonate tetrahydrate and zinc(II) methanesulphonate tetrahydrate are both new compounds which crystallize in monoclinic space group P21/c. Their unit-cell parameters and indexed powder patterns are given.
    Type of Medium: Electronic Resource
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