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  • 1
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    Comparison of the performances of two biotic indices based on the MacroBen database (2009)
    In:  EPIC3Marine Ecology Progress Series 382:, pp. 297-311
    Details
    Publication Date: 2019-07-17
    Description: The pan-European MacroBen database was used to compare the AZTI Marine Biotic Index (AMBI) and the Benthic Quality Index (BQIES), 2 biotic indices which rely on 2 distinct assessments of species sensitivity/tolerance (i.e. AMBI EG and BQI E[S50]0.05) and which up to now have only been compared on restricted data sets. A total of 12 409 stations were selected from the database. This subset (indicator database) was later divided into 4 marine and 1 estuarine subareas. We computed E(S50)0.05 in 643 taxa, which accounted for 91.8% of the total abundances in the whole marine indicator database. AMBI EG and E(S50)0.05 correlated poorly. Marked heterogeneities in E(S50)0.05 between the marine and estuarine North Sea and between the 4 marine subareas suggest that sensitivity/tolerance levels vary among geographical areas. High values of AMBI were always associated with low values of BQIES, which underlines the coherence of these 2 indices in identifying stations with a bad ecological status (ES). Conversely, low values of AMBI were sometimes associated with low values of BQIES resulting in the attribution of a good ES by AMBI and a bad ES by BQIES.This was caused by the dominance of species classified as sensitive by AMBI and tolerant by BQIES. Some of these species are known to be sensitive to natural disturbance, which highlights the tendency of BQIES to automatically classify dominant species as tolerant. Both indices thus present weaknesses in their way of assessing sensitivity/tolerance levels (i.e. existence of a single sensitivity/tolerance list for AMBI and the tight relationship between dominance and tolerance for BQIES). Future studies should focus on the (1) clarification of the sensitivity/tolerance levels of the species identified as problematic, and (2) assessment of the relationships between AMBI EG and E(S50)0.05 within and between combinations of geographical areas and habitats.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    MacroBen integrated database on benthic invertebrates of European continental shelves: a tool for large-scale analysis across Europe (2009)
    In:  EPIC3Marine Ecology Progress Series 382:, pp. 225-238
    Details
    Publication Date: 2019-07-17
    Description: We describe an integrated database on European macrobenthic fauna, developed within the framework of the European Network of Excellence MarBEF, and the data and data integration exercise that provided its content. A total of 44 datasets including 465 354 distribution records from soft-bottom macrobenthic species were uploaded into the relational MacroBen database, corresponding to 22 897 sampled stations from all European seas, and 7203 valid taxa. All taxonomic names were linked to the European Register of Marine Species, which was used as the taxonomic reference to standardise spelling and harmonise synonymy. An interface was created, allowing the user to explore, subselect, export and analyse the data by calculating different indices. Although the sampling techniques and intended use of the datasets varied tremendously, the integrated database proved to be robust, and an important tool for studying and understanding large-scale long-term distributions and abundances of marine benthic life. Crucial in the process was the willingness and the positive data-sharing attitude of the different data contributors. Development of a data policy that is highly aware of sensitivities and ownership issues of data providers was essential in the creation of this goodwill.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese und Eigenschaften einiger höhergliedriger cyclischer Atheracetale (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 204-204 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498297
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  • 4
    Electronic Resource
    Electronic Resource
    Hydroelastische Schwingungen eines schwimmenden Balkens unter einem gleichförmig bewegten Einachsfahrzeug als ebenes Problem (1993)
    Springer
    Archive of applied mechanics 63 (1993), S. 86-100 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract The hydroelastic vibrations of a rectangular beam under the effect of an uniformly moving one axle vehicle will be investigated by normal mode method for the case of two-dimensional potential flow realized by artificial elimination of surface waves aside the beam. In the case of homogeneous beam spanning over a rectangular channel filled with calm water the normal modes are determined considering surface waves only that are able to compensate the volume of the enclosed fluid. An analytical method will be shown to find the vehicle's vertical acceleration governing the response of the system. The presented example of a continuous pontoonbridge crossed by a rolling mass demonstrates the load's way, surface waves and the velocity distribution of the flow.
    Notes: Übersicht Die hydroelastischen Schwingungen eines schwimmenden Rechteckbalkens unter einem gleichförmig bewegten Einachsfahrzeug werden mit Hilfe der Eigenformmethode berechnet für ebene Potentialströmung bei Ausschaltung seitlicher Wellenabstrahlung. Für den Fall des homogenen Balkens auf einem stehenden Gewässer mit rechteckigem Bett werden die Eigenformen bestimmt unter Berücksichtigung des Volumenausgleichs durch die Oberflächenwellen. Der Lösungsweg zur Berechnung der Bahnbeschleunigung des Einachsfahrzeugs wird aufgezeigt, die für die Systemantwort maßgebend ist. Am Beispiel einer kontinuierlichen Pontonbrücke unter einer rollenden Einzelmasse werden die Lastwegkurve, Oberflächenwellen und die Verteilung der Strömungsgeschwindigkeit vorgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788915
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  • 5
    Electronic Resource
    Electronic Resource
    NMR-Untersuchungen an Polyacetalen. 3. Mitt. Sequenzanalyse bei 1,3,5-Trioxan/1,3-Dioxolan-Copolymeren durch13C-NMR-Spektroskopie (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 718-718 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550166
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  • 6
    Electronic Resource
    Electronic Resource
    Polymerisation von makro cyclischen Formalen (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 109-109 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539046
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  • 7
    Electronic Resource
    Electronic Resource
    NMR-Untersuchungen an Polyacetalen 4. Mitt. Sequenzanalyse von Homo- und Copolymeren des 1,3,5-Trioxepans (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 821-821 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01664546
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und eigenschaften einiger höhergliedriger cyclischer ätheracetale (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 3191-3195 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Optimized syntheses of 1,3,6,9-tetraoxacycloundecane (2), 1,3,6,9,12-pentaoxacylotetradecane (3), and 1,3,6,9,12,14,17,20-octaoxacyclodocosane (4) as well as some physical and chemical properties and the proof of structure are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021781202
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  • 9
    Electronic Resource
    Electronic Resource
    1 3C-NMR-Spektroskopie an Polyäthern (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 450-450 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861216
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  • 10
    Electronic Resource
    Electronic Resource
    Blends aus polyvinylchlorid und chloriertem polyäthylen. III. Untersuchungen von dynamischen eigenschaften, schlagzähigkeit, transparenz und fließverhaltenTeil II: Angew. Makromol. Chem. 58/59 (1977) 121. (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 62 (1977), S. 69-84 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The modul of the polymeric two phase system poly(vinylchloride)/chlorinated poly(ethylene) is dependent on manufacturing conditions during melt blending. We have compared experimentally determined moduls of these blends with calculated moduls according to the models of Davies and Nielsen. The calculated moduls are in agreement with morphological findings by electron microscopy. An interpenetrating network of the two phases or a sphere-in-matrix morphology is found dependent on concentration and on manufacturing conditions during melt blending.Optical properties of the modified PVC were determined by light scattering.Correlation of impact properties of these blends with morphological observations confirms the interpenctrating network structure as optimal to achieve good mechanical properties. This morphology has also the lower melt viscosity compared to the spherematrix-morphology. These rheological results are compared with the particle flow of PVC being demonstrated with two samples of emulsion PVC.
    Notes: Moduluntersuchungen am polymeren Zweiphasensystem Polyvinylchlorid/chloriertes Polyäthylen zeigen eine große Abhängigkeit von den Verarbeitungsbedingungen. Die experimentell in Abhängigkeit von der Zusammensetzung ermittelten Moduln dieser Mischungen werden mit nach Davies und Nielsen berechneten Moduln verglichen. Die theoretischen Ansätze zeigen eine gute übereinstimmung mit elektronenmikroskopisch ermittelten Zweiphasenmorphologien, die je nach Verarbeitungsbedingungen und Konzentrationsverhältnissen der beiden Phasen ein Kautschuknetzwerk oder eine kugelförmige Dispergierung der Hart- bzw. Weichphase in der Weich- bzw. Hartmatrix darstellen.Optische Eigenschaften des modifizierten PVC werden mittels Streulicht untersucht.Korrelierung der Kerbschlagzähigkeit mit morphologischen Ergebnissen weist die Netzwerkmorphologies als optimale Verteilung zur Erzielung guter mechanischer Eigenschaften aus. Gleichzeitig zeichnet sich diese Morphologie gegenüber der kugelförmigen Dispergierung der Kautschukphase in der PVC-Hartmatrix durch eine niedrigere Schmelzviskosität aus. Die rheologischen Ergebnisse werden zum Partikelfließen des PVC in Beziehung gesetzt, welches an zwei ausgewählten Emulsions-PVC-Proben demonstriert wird.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050620106
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