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  • 550 - Earth sciences  (9)
  • Chemistry  (2)
  • methane  (1)
  • 74.20
  • 2010-2014  (10)
  • 1955-1959  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Zur Morphologie der Gefriertrocknung (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 197-198 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Gefriertrocknung von Lösungen fadenförmiger und kugelförmiger Hochpolymerer, niedermolekularer Zucker und sogar anorganischer Salze wurden Gerüststrukturen von teilweise bemerkenswerter Festigkeit erhalten. Das makroskopische Bild der Trockensubstanzen wird bei allen Stoffgruppen durch die Textur des ausfrierenden Lösungsmittels bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19570690603
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zur problematik der ermittlung von viskositätszahlen aus strukturviskosen lösungen. (Viskositätsmessungen an nativen dextranen) (1956)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 18 (1956), S. 422-430 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Solutions of extremely high molecular dextrans show such pronounced deviations from Newtonian behaviour, even in the range of low concentrations, that the determination of shear-independent intrinsic viscosities in the usual manner does not succeed. The rheological behaviour of such dextran solutions is described and methods of evaluation are discussed, which permit the elimination of the effect of rate of shear upon the intrinsic viscosity. Effects of thixotropy are mentioned.
    Notes: Lösungen sehr hochmolekularer Dextrane zeigen noch im Bereich kleiner Konzentrationen so starke Abweichungen vom Newton schen Verhalten, daß die Ermittlung schubspannungsunabhängiger Viskositätszahlen auf dem üblichen Wege nicht mehr gelingt. Das Fließverhalten solcher Dextranlösungen wird beschrieben, und es werden Auswertungsverfahren diskutiert, die bei derartigen Systemen den Einfluß der Scherbeanspruchung auf die Viskositätszahl zu eliminieren gestatten. Auf Thixotropieerscheinungen bei solchen Lösungen wird hingewiesen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1956.020180137
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  • 3
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    The European land and inland water CO2, CO, CH4 and N2O balance between 2001 and 2005 (2013)
    Copernicus Publications
    Details
    Publication Date: 2021-01-11
    Description: Globally, terrestrial ecosystems have absorbed about 30% of anthropogenic greenhouse gas emissions over the period 2000–2007 and inter-hemispheric gradients indicate that a significant fraction of terrestrial carbon sequestration must be north of the Equator. We present a compilation of the CO2, CO, CH4 and N2O balances of Europe following a dual constraint approach in which (1) a landbased balance derived mainly from ecosystem carbon inventories and (2) a land-based balance derived from flux measurements are compared to (3) the atmospheric data-based balance derived from inversions constrained by measurements of atmospheric GHG (greenhouse gas) concentrations. Good agreement between the GHG balances based on fluxes (1294±545 Tg C in CO2-eq yr−1), inventories (1299±200 Tg C in CO2-eq yr−1) and inversions (1210±405 Tg C in CO2-eq yr−1) increases our confidence that the processes underlying the European GHG budget are well understood and reasonably sampled. However, the uncertainty remains large and largely lacks formal estimates. Given that European net land to atmosphere exchanges are determined by a few dominant fluxes, the uncertainty of these key components needs to be formally estimated before efforts could be made to reduce the overall uncertainty. The net land-to-atmosphere flux is a net source for CO2, CO, CH4 and N2O, because the anthropogenic emissions by far exceed the biogenic sink strength. The dual-constraint approach confirmed that the European biogenic sink removes as much as 205±72 Tg C yr−1 from fossil fuel burning from the atmosphere. However, This C is being sequestered in both terrestrial and inland aquatic ecosystems. If the C-cost for ecosystem management is taken into account, the net uptake of ecosystems is estimated to decrease by 45% but still indicates substantial C-sequestration. However, when the balance is extended from CO2 towards the main GHGs, C-uptake by terrestrial and aquatic ecosystems is offset by emissions of non-CO2 GHGs. As such, the European ecosystems are unlikely to contribute to mitigating the effects of climate change.
    Description: Published
    Description: 3357–3380
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: JCR Journal
    Description: restricted
    Keywords: carbon dioxide ; methane ; soil ; ecosystems ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Airborne Eddy Covariance Measurements of Northern Wetland Methane Emissions (2012)
    In:  IPY 2012 Conference 'From Knowledge to Action' (Montréal 2012)
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-Arctic Wetlands (2012)
    In:  Geophysical Research Abstracts Vol. 14, EGU2012-2382, 2012
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 6
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    Quantification of methane emission rates from coal mine ventilation shafts using airborne remote sensing data (2013)
    In:  Atmospheric Measurement Techniques
    Details
    Publication Date: 2020-02-12
    Description: The quantification of emissions of the greenhouse gas methane is essential for attributing the roles of anthropogenic activity and natural phenomena in global climate change. Our current measurement systems and networks, whilst having improved during the last decades, are deficient in many respects. For example, the emissions from localised and point sources such as landfills or fossil fuel exploration sites are not readily assessed. A tool developed to better understand point sources of the greenhouse gases carbon dioxide and methane is the optical remote sensing instrument MAMAP (Methane airborne MAPper), operated from aircraft. After a recent instrument modification, retrievals of the column-averaged dry air mole fractions for methane XCH4 (or for carbon dioxide XCO2) derived from MAMAP data have a precision of about 0.4% or better and thus can be used to infer emission rate estimates using an optimal estimation inverse Gaussian plume model or a simple integral approach. CH4 emissions from two coal mine ventilation shafts in western Germany surveyed during the AIRMETH 2011 measurement campaign are used as examples to demonstrate and assess the value of MAMAP data for quantifying CH4 from point sources. While the knowledge of the wind is an important input parameter in the retrieval of emissions from point sources and is generally extracted from models, additional information from a turbulence probe operated on-board the same aircraft was utilised to enhance the quality of the emission estimates. Although flight patterns were optimised for remote sensing measurements, data from an in situ analyser for CH4 were found to be in good agreement with retrieved dry columns of CH4 from MAMAP and could be used to investigate and refine underlying assumptions for the inversion procedures. With respect to the total emissions of the mine at the time of the overflight, the inferred emission rate of 50.4 kt CH4 yr−1 has a difference of less than 1% compared to officially reported values by the mine operators, while the uncertainty, which reflects variability of the sources and conditions as well as random and systematic errors, is about ±13.5%.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 7
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    The German Young Geoscientists Group - promoting exchange and information among the next generation of geoscientists (2011)
    In:  Geophysical Research Abstracts, 13, EGU2011-11312, 2011
    Details
    Publication Date: 2020-02-12
    Description: The group „Young geoscientists” of the Senate Commission for Joint Geoscientific Research (Geokommisson, www.geokommission.de) of the German Research Foundation (DFG), is dedicated towards the development of the working environment, workforce and scientific outcome of the next generation of geoscientists in Germany. Geoscientific research – basic as, well as applied – provides crucial contributions for mastering the economic, environmental and societal challenges of the near and medium-term future. Politics and society call for immediate answers, while geoscientific phenomena are complex and act on a large range of temporal and spatial scales. These demands, together with increases mobility requirements, lead to increasing pressure especially on young geoscientists. In this situation the main goals of the group “Young geoscientists” are: • Promotion of networking among young geoscientists • Information about science policy developments, funding opportunities and other relevant matters • Representing the interests of young scientists towards (science)-policy makers The dynamic development of geoscientific research, particularly collaborations across traditional disciplines, as well as in increasing demands from public and policy, calls for a continuous integration of young scientists. We promote this process by organizing round-table discussions, e.g. on “Guaranteeing good scientific praxis” or on “Hot topics and research funding”, by communicating information via the internet and by identifying structural deficiencies that might hinder the advancement of the geosciences and reporting them to decision makers. In this context, we are looking for: • European or international collaborators • Young geoscientists wishing to participate in / contribute to our activities • Suggestions on how to improve working conditions of the young and advancing geoscientists Personal contact and details on the work of the „Young geoscientists” can be found at this poster presentation. More information can also be found on www.geonachwuchs.de or contact Dr. Ingo Sasgen, sasgen@gfz-potsdam.de
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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  • 8
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    Variability of methane fluxes over high latitude permafrost wetlands (2013)
    In:  Geophysical Research Abstracts Vol. 15, EGU2013-12914, 2013
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 9
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    Airborne eddy covariance measurements of methane over mid-latitude and sub-Arctic wetlands (2011)
    In:  AGU 2011 Fall Meeting (San Francisco 2011)
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 10
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    Dynamische Erde - Zukunftsaufgaben der Geowissenschaften : Strategieschrift (2010)
    Senatskommission für geowissenschaftliche Gemeinschaftsforschung der Deutschen Forschungsgemeinschaft
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/book
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