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  • 1
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    Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene (2015)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Polar Research, WILEY-BLACKWELL PUBLISHING, 34, pp. 24964, ISSN: 0800-0395
    Details
    Publication Date: 2016-10-12
    Description: Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing paleoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, due to the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, thus, suggesting enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Orthogonal stagnation flow, a framework for steady extensional flow experiments (1979)
    Springer
    Rheologica acta 18 (1979), S. 323-334 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es werden neue Leitlinien zur Beurteilung von stationären Dehnströmungs-Experimenten vorgeschlagen: Die stationäre orthogonale Staupunktströmung wird als ein Ideal herausgestellt, das man in Experimenten zu erreichen versuchen sollte. Die Kinematik und die Randbedingung für das Spannungsfeld werden für allgemeine Staupunktströmungen hergeleitet und auf zwei Sonderfälle angewendet: die axialsymmetrische und die ebene Staupunktströmung. Der Vergleich dieser idealen Strömung mit wirklichen Experimenten verdeutlicht deren jeweilige Vor- und Nachteile und weist so auf neue Experimente hin. Mehrere neue Experimente werden vorgeschlagen. Die axialsymmetrisch nach außen gerichtete und die ebene Staupunktströmung in Düsen mit geschmierten Wandungen erscheinen besonders erfolgversprechend. Einige vorläufige experimentelle Ergebnisse für die einachsige Dehnströmung einer Polyacrylamidlösung in einer mit Wasser geschmierten Düse werden vorgestellt.
    Notes: Summary A new framework for viewing steady extensional flow is presented: Steady orthogonal stagnation flow is an ideal which one should strive to reach in an actual experiment. The kinematics and the stress boundary conditions are developed for stagnation flow in general and in two special cases: the impingement of two circular streams and of two planar sheets. Contemplating this ideal clarifies the advantages and disadvantages of current experiments, thereby pointing the way towards new experiments; a number are suggested. Axisymmetric (with $$\dot \varepsilon _x $$ 〉 0) and planar stagnation flow within a lubricated die look particularly promising. Some preliminary experimental results are given for uniaxial extension of a polyacrylamide solution in a water lubricated die.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01515825
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene (2015)
    Norwegian Polar Institute
    In:  Polar Research, 34 (24964).
    Details
    Publication Date: 2017-12-19
    Description: Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-Arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing palaeoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, as a result of the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, which suggests enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.3402/polar.v34.24964
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
    facet.materialart.
    Unknown
    Managing cognitive impairment following stroke: protocol for a systematic review of non-randomised controlled studies of psychological interventions (2018)
    BMJ Publishing
    In: BMJ Open
    Details
    Publication Date: 2018-01-12
    Description: Introduction Stroke is one of the primary causes of death and disability worldwide, leaving a considerable proportion of survivors with persistent cognitive and functional deficits. Despite the prevalence of poststroke cognitive impairment, there is no established treatment aimed at improving cognitive function following a stroke. Therefore, the aims of this systematic review are to identify psychological interventions intended to improve poststroke cognitive function and establish their efficacy. Methods and analysis A systematic review of non-randomised controlled studies that investigated the efficacy of psychological interventions aimed at improving cognitive function in stroke survivors will be conducted. Electronic searches will be performed in the PubMed, Embase and PsycINFO databases, the search dating from the beginning of the index to February 2017. Reference lists of all identified relevant articles will be reviewed to identify additional studies not previously identified by the electronic search. Potential grey literature will be reviewed using Google Scholar. Titles and abstracts will be assessed for eligibility by one reviewer, with a random sample of 50% independently double-screened by second reviewers. Any discrepancies will be resolved through discussion, with referral to a third reviewer where necessary. Risk of bias will be assessed with the Risk of Bias in Non-randomized Studies of Interventions tool. Meta-analyses will be performed if studies are sufficiently homogeneous. This review will follow the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. The quality of the evidence regarding cognitive function will be assessed according to the Grading of Recommendations Assessment, Development and Evaluation. Ethics and dissemination This systematic review will collect secondary data only and as such ethical approval is not required. Findings will be disseminated through presentations and peer-reviewed publication. This review will provide information on the effectiveness of psychological interventions for poststroke cognitive impairment, identifying which psychological interventions are effective for improving poststroke cognitive function. PROSPERO registration number CRD42017069714.
    Keywords: Open access, Public health
    Electronic ISSN: 2044-6055
    Topics: Medicine
    Published by BMJ Publishing
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    PAPER CURRENT
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