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  • Cascade arcs  (1)
  • diatoms  (1)
  • meiobenthos  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Description of a flowing cascade arc plasma (1990)
    Springer
    Plasma chemistry and plasma processing 10 (1990), S. 531-551 
    Details
    ISSN: 1572-8986
    Schlagwort(e): Cascade arcs ; flowing plasmas ; nonequilibrium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Technik allgemein
    Notizen: Abstract The plasma in a cascaded arc in argon with flow is studied both experimentally and theoretically. The plasma pressure has been measured as a function of axial position in the are channel with a Baratron pressure transducer. The electron density and the electron temperature have been determined as a function of axial position using Hβ-Stark broadening and line-continuum emissivity ratio, respectively. Comparison of the gas pressure measurements with an equilibrium model suggests that the /low is laminar. A one-dimensional nonequilibrium model based on the electron- and heavy-particle number balances and the heavy-particle energy balance is presented. The measured axial profiles of the electron density agree well with the model predictions, especially in the most upstream part of the arc channel. The plasma is strongly ionizing. Temperature equilibration takes about 20 mm of arc length, depending on the argon flow.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01447263
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  • 2
    Digitale Medien
    Digitale Medien
    Diatom assemblages in surface sediments along the east coast of Lake Tanganyika (2000)
    Springer
    Hydrobiologia 436 (2000), S. 59-71 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Lake Tanganyika ; surface sediments ; diatoms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Surface sediment diatoms from the east coast of Lake Tanganyika were analysed using ordination and classification techniques, and compared with assemblages previously described from the northern part of the lake. Grain-size analyses were performed on subsamples. Four groups of diatom assemblages were recognised. The first group clusters samples taken in the north, far from the Rusizi river mouth. The second group comprises samples taken on silty sediment along the Tanzanian coast, including one sample taken near the mouth of the Malagarazi river and those from the northernmost part of the lake. The third group comprises surface sediments along the Burundian coast (near Ramba and Magara), and the fourth is characterised by epipsammic taxa. A sample taken near the central arm of the Malagarazi river is included in the latter group. The impact of small rivers on the diatom assemblages in the surface sediments is restricted to the mouth area.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026533804130
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  • 3
    Digitale Medien
    Digitale Medien
    The meiobenthos of five mangrove vegetation types in Gazi Bay, Kenya (1992)
    Springer
    Hydrobiologia 247 (1992), S. 99-108 
    Details
    ISSN: 1573-5117
    Schlagwort(e): meiobenthos ; mangroves ; distribution ; Kenya
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The vertical distribution of meiofauna in the sediments ofAvicennia marina,Bruguiera gymnorrhiza,Ceriops tagal,Rhizophora mucronata andSonneratia alba at Gazi Bay (Kenya), is described. Seventeen taxa were observed, with highest densities in the sediments ofBruguiera (6707 ind. 10 cm−2), followed byRhizophora (3998 ind. 10 cm−2),Avicennia (3442 ind. 10 cm−2),Sonneratia (2889 ind. 10 cm−2) andCeriops (1976 ind. 10 cm−2). Nematodes accounted for up to 95% of total densities; other common taxa were copepods, turbellarians, oligochaetes, polychaetes, ostracods and rotifers. High densities occurred to about 20 cm depth in the sediment. EspeciallyCeriops sediments show still high densities of nematodes (342 ind. 10 cm−2) and copepods (11 ind. 10 cm−2) in the deepest layer (15–22 cm). Particle size and oxygen conditions were major factors influencing meiobenthic distribution;Uca burrows had a major impact on distribution and abundance of meiofauna.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00008208
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