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  • 2020-2023  (2)
  • 1960-1964  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Eine Schnellmethode zur Untersuchung der Lösungsgeschwindigkeit der Metalle in korrodierenden Lösungen (1962)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 13 (1962), S. 665-666 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: A rapid method for examining the dissolving rate of metals in corroding solutionsThe aqueous corrosion solution is applied to the metal surface to be investigated by means of a porous carrier, e. g. filter paper. After a certain reaction time, the carrier is removed and the quantity of metal dissolved is determined by means of a special polarographic method. Owing to the high sensitivity of the detection method and the very small volume of liquid, it is possible to determine the concentration of the dissolved metals after a very short time already.
    Notes: Die wäßrige Korrosionslösung wird mit einem porösen Träger - z. B. Filtrierpapier - auf die zu untersuchende Metallfläche gebracht. Nach einer gewissen Einwirkungszeit wird der Träger abgehoben und das gelöste Metall mit Hilfe einer speziellen polarographischen Methode bestimmt. Die hohe Empfindlichkeit der Detektormethode und das sehr kleine Flüssigkeitsvolumen gestatten nach sehr kurzer Zeit die Konzentration des gelösten Metalls zu bestimmen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19620131102
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    Paper (German National Licenses)
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  • 2
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    A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector (2022)
    In:  Geoscientific Model Development
    Details
    Publication Date: 2022-07-20
    Description: Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a single model forced with limited scenario-driven projections of future climate for a relatively small number of lakes. As a result, our understanding of the effects of climate change on lakes is fragmentary, based on scattered studies using different data sources and modelling protocols, and mainly focused on individual lakes or lake regions. This has precluded identification of the main impacts of climate change on lakes at global and regional scales and has likely contributed to the lack of lake water quality considerations in policy-relevant documents, such as the Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC). Here, we describe a simulation protocol developed by the Lake Sector of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) for simulating climate change impacts on lakes using an ensemble of lake models and climate change scenarios. The protocol prescribes lake simulations driven by climate forcing from gridded observations and different Earth system models under various Representative Greenhouse Gas Concentration Pathways, all consistently bias-corrected on a 0.5° × 0.5° global grid. In ISIMIP phase 2, 11 lake models were forced with these data to project the thermal structure of 62 well-studied lakes where data were available for calibration under historical conditions, and for nearly 17,500 lakes using uncalibrated models and forcing data from the global grid where lakes are present. In ISIMIP phase 3, this approach was expanded to consider more lakes, more models, and more processes. The ISIMIP Lake Sector is the largest international effort to project future water temperature, thermal structure, and ice phenology of lakes at local and global scales and paves the way for future simulations of the impacts of climate change on water quality and biogeochemistry in lakes.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Investigation of Different Trench Geometries for Optimized Bedding of Buried Power Cables (2022)
    In:  Abstracts
    Details
    Publication Date: 2022-12-05
    Description: For an efficient integration of renewable energies, many transmission lines of the electrical power grid have to be extended or newly built. Besides the common overhead transmission lines, an increasing proportion of these grid expansions is conducted using underground power cables.During the operation of buried cable systems, the mechanical and thermal properties of the cable's surroundings need to meet certain requirements. To avoid insulation faults in the cables due to overheating, the ampacity is limited by specific conductor temperatures and the thermal energy resulting from the electric losses during transmission needs to be reliably dissipated. Thus, the actual performance of a buried power cable system depends strongly on the thermal properties of the cable bedding materials and soil.In practice, buried power cable lines typically require the use of cable trenches. The pre-existing soil from the cable trench is usually replaced by sand or artificial fluidized backfill materials with well-known material properties, which may differ from the properties of the surrounding soil. Thus, heterogeneous structures are created in the shallow subsurface, which affect the heat and water transport around the power cables. With an installation depth of 0.5 - 2.5 m, the cables are typically located in the vadose zone, where the thermal properties of the bedding are affected by the varying water content by up to one order of magnitude. Therefore, precise knowledge of the influence of size and geometry of the cable trench on the water distribution around the cable is crucial for an adequate assessment of the cable's ampacity ratings.Within the scope of our research, the influence of cable trench geometry and size on heat and mass transfer around buried power cables were investigated with a coupled approach of laboratory experiments and numerical modeling.
    Type: info:eu-repo/semantics/conferenceObject
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