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  • Compaction  (1)
  • Polymer and Materials Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Burrowing ability of the earthworm Aporrectodea longa limited by soil compaction and water potential (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 48-51 
    Details
    ISSN: 1432-0789
    Keywords: Earthworm ; Cast ; Compaction ; Water potential ; Aporrectodea longa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Adult earthworms (Aporrectodea longa) were maintained for 199 days in soil columns (h=30 cm; ø=10 cm) where the water potential ranged from -7 to-65 kPa and compaction from 50 to 350 kPa. The weight of casts on the soil surface was measured at the end of two periods of activity (spring and autumn). Cast production increased with bulk density, but the activity of earthworms was limited both by the mechanical strength of the soil and by decreasing water potential. The results obtained in the laboratory conditions of this study were consistent with field observations on casting and burrowing activities. The effects of water potential and soil compaction on these activities were estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335834
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  • 2
    Electronic Resource
    Electronic Resource
    Permeationsuntersuchungen an stabilisierten Schaumlamellen (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 426-431 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The time-dependence of the permeation of methanol vapour through tenside-alginate foam lamels was determined by measuring the permeation, diffusion and solubility coefficients. Steady-state transport was found to occur only within narrow time limits. The agreement of calculated and experimental relationships between the coefficients suggest solution diffusion as proposed by BARRER. The transport mechanism can be explained by the place exchange theory and by the cluster theory according to LUCK.
    Notes: Für Tensid/Alginat-Schaumlamellen wurde der Durchtritt von Methanoldampf an Hand der Permeations-, Diffusions-und Löslichkeitskoeffizienten in Abhängigkeit von der Zeit ermittelt. Stationäre Transportzustände existieren nur in engen Zeitintervallen. Aus der Übereinstimmung zwischen den berechneten und experimentell ermittelten Koeffizienten-Beziehungen wird auf eine Lösungsdiffusion nach BARRER geschlossen. Der Transportmechanismus kann auf der Grundlage der Platzwechseltheorie sowie der Cluster-Theorie nach LUCK gedeutet wurden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300710
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    Paper (German National Licenses)
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