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  • 1995-1999  (2)
  • 1905-1909
  • 1900-1904
  • 1995  (2)
  • Emulsion model  (1)
  • HAC  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Assessment of the bio-indicator capacity of aquatic macrophytes using multivariate analysis (1995)
    Springer
    Hydrobiologia 300-301 (1995), S. 115-122 
    Details
    ISSN: 1573-5117
    Keywords: macrophytes ; streams ; PCA ; HAC ; bio-indicator ; water chemistry ; geology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aquatic vegetation of twenty one streams, located at the head of watersheds and representative of the geological diversity of the Lorraine, was analysed with regard to its environmental d escriptors (geology, morphometry and water chemistry). A Principal Components Analysis was carried out on the data (230 stations and 134 variables). using 40 active chemical and morphometrical variables. This procedure was followed by a Hierarchical Ascending Classification for grouping the variables into classes. The analysis of the mesological and chemical structures of the streams indicated the dominance of geochemical parameters compared to pollution parameters. The indicator capacity of several species was revealed, e.g. Scapania undulata for weakly mineralized, oligotrophic waters; Potamogeton pectinatus for eutrophicated waters and Ranunculus fluitans for high nitrate levels. Five species groups characterizing the geology and mineralization as well as the perturbations in the quality of the water or the environment were identified (e.g. pollution, eutrophication, reposition and reshaping).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024453
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Drop deformation during elongational flow in blends of viscoelastic fluids. Small deformation theory and comparison with experimental results (1995)
    Springer
    Rheologica acta 34 (1995), S. 525-533 
    Details
    ISSN: 1435-1528
    Keywords: Emulsion model ; polymer blends ; drop deformation ; elongational flow ; viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The deformation of dispersed droplets in immiscible polymer blends was studied in elongational flow, with an original method based on quenching specimens elongated in the melt. Results for high capillary numbers and different viscosity ratios were compared to the linear theory of viscoelastic emulsions of Palierne. Simple expressions for the drop deformation could be obtained for Maxwell fluids, and the influence of viscoelasticity of matrix and inclusions on the drop deformation process was discussed. With respect to the Newtonian approximation, the description of some experimental data could be improved. However, the predictions of the viscoelastic model appeared to be very sensitive to the choice of relaxation times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712313
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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