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  • 2000-2004  (1)
  • 1990-1994  (1)
  • 1925-1929
  • Overlapping clustering  (1)
  • aquatic plants  (1)
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  • 2000-2004  (1)
  • 1990-1994  (1)
  • 1925-1929
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  • 1
    Electronic Resource
    Electronic Resource
    An alternating combinatorial optimization approach to fitting the INDCLUS and generalized INDCLUS models (1994)
    Springer
    Journal of classification 11 (1994), S. 155-170 
    Details
    ISSN: 1432-1343
    Keywords: Overlapping clustering ; Cluster analysis ; ADCLUS ; INDCLUS ; MAPCLUS ; Separability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper presents a general approach for fitting the ADCLUS (Shepard and Arabie 1979; Arabie, Carroll, DeSarbo, and Wind 1981), INDCLUS (Carroll and Arabie 1983), and potentially a special case of the GENNCLUS (DeSarbo 1982) models. The proposed approach, based largely on a separability property observed for the least squares loss function being optimized, offers increased efficiency and other advantages over existing approaches like MAPCLUS (Arabie and Carroll 1980) for fitting the ADCLUS model, and the INDCLUS method for fitting the INDCLUS model. The new procedure (called “SINDCLUS”) is applied to three sets of empirical data to demonstrate the effectiveness of the SINDCLUS methodology. Finally, some potentially useful extensions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195676
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of the emergent macrophyte Juncus effusus L. on the chemical composition of interstitial water and bacterial productivity (2000)
    Springer
    Biogeochemistry 48 (2000), S. 307-322 
    Details
    ISSN: 1573-515X
    Keywords: aquatic plants ; dissolved organic carbon ; nutrient cycling ; phosphorus ; sediments ; wetlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Release of oxygen from the roots ofaquatic macrophytes into anaerobic sediments canaffect the quantity of interstitial dissolved organicmatter and nutrients that are available to bacteria. Nutrient and dissolved organic carbon (DOC)concentrations were compared between subsurface(interstitial) waters of unvegetated sediments andsediments among stands of the emergent herbaceousmacrophyte Juncus effusus L. in a lotic wetlandecosystem. Concentrations of inorganic nitrogen(NH4 +, NO3 -, and NO2 -)were greater from sediments of the unvegetatedcompared to the vegetated zone. DOC concentrations ofinterstitial waters were greater in sediments of theunvegetated zone both in the winter and springcompared to those from the vegetated zone. AlthoughDOC concentrations in hydrosoils collected from bothzones increased from winter to spring, bacterialproductivity per mg DOC in spring decreased comparedto winter. Greater initial bacterial productivityoccurred on DOM collected from the vegetated comparedto the unvegetated zone in winter samples (days 1 and4), with increased bacterial productivity on samplescollected from the unvegetated zone at the end of thestudy (day 20). Bacterial productivity wassignificantly greater on all sampling days on DOM fromvegetated samples compared to unvegetated samples. In nutrient enrichment experiments, bacterialproductivity was significantly increased (p 〈 0.05)with phosphorus but not nitrogen only amendments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006208213821
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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