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Now showing items 71-80 of 89
Preprint
Creation and merging of ontology top-levels
(2003)
We provide a new method for systematically structuring the top-down level of ontologies. It is based on an interactive, top-down knowledge acquisition process, which assures that the knowledge engineer considers all possible cases while avoiding redundant acquisition. The method is suited especially for creating/merging the top part(s) of the ontologies, where high accuracy is required, and for supporting the merging of two (or more) ontologies on that level.
Teil eines Buches
Kulturlandschaft genießen - Natur im Kontext der Ernährungskultur
(Bundesamt für NaturschutzBfN-Schr.-Vertrieb im Landwirtschaftsverl., 2003)
Wie leben Menschen? Welche Lebensmittel konsumieren sie? Und: Welches Verständnis von Natur und Ernährungskultur spiegelt sich darin wider? Fragen, denen der vorliegende Beitrag unter der Überschrift "Kulturlandschaft genießen - Natur im Kontext der Ernährungskultur" nachgeht. Besondere Beachtung finden dabei die, durch einen Wandel der Lebensstile implizierten Veränderungen im Alltagshandeln der Bevölkerung Deutschlands. Auch werden Möglichkeiten einer Sensibilisierung für frische, naturbelassene Lebensmittel und ...
Aufsatz
Computational aspects of the symmetric eigenvalue problem of second order tensors
(Institut für Mechanik, Otto-von-Guericke-Universität Magdeburg, 2003)
Dissertation
Polarization and correlation phenomena in the radiative electron capture by bare highly-charged ions
(2003)
In dieser Arbeit wird die Wechselwirkung zwischen einem Photon und einem Elektron im starken
Coulombfeld eines Atomkerns am Beispiel des radiativen Elektroneneinfangs beim Stoß hochgeladener
Teilchen untersucht. In den letzten Jahren wurde dieser Ladungsaustauschprozess insbesondere
für relativistische Ion–Atom–Stöße sowohl experimentell als auch theoretisch ausführlich erforscht. In Zentrum standen dabei haupsächlich die totalen und differentiellen Wirkungsquerschnitte.
In neuerer Zeit werden vermehrt Spin– und ...
Aufsatz
Phosphorus placement an acid arenosols of the West African Sahel
(2003)
Phosphorus (P) deficiency is a major constraint to pearl millet (Pennisetum glaucum L.) growth on acid sandy soils of the West African Sahel. To develop cost-effective fertilization strategies for cash poor farmers, experiments with pearl millet were conducted in southwestern Niger. Treatments comprised single superphosphate hill-placed at rates of 1, 3, 5 or 7 kg P ha^−1 factorially combined with broadcast P at a rate of 13 kg ha^−1. Nitrogen was applied as calcium ammonium nitrate at rates of 30 and 45 kg ha^−1. ...
Aufsatz
Changes in amino acid enantiomers and microbial performance in soils from a subtropical mountain oasis in Oman abandoned for different periods
(2003)
An important feature of maintaining the agricultural stability in millennia-old mountain oases of northern Oman is the temporary abandonment of terraces. To analyse the effects of a fallow period on soil microbial performance, i.e. microbial activity and microbial biomass, samples of eight terrace soils abandoned for different periods were collected in situ, assigned to four fallow age classes and incubated for 30 days in the laboratory after rewetting. The younger fallow age classes of 1 and 5 years were based on ...
Aufsatz
Cereal/legume rotation effects on rhizosphere bacterial community structure in West African soils
(2003)
The increased use of cereal/legume crop rotation has been advocated as a strategy to increase cereal yields of subsistence farmers in West Africa, and is believed to promote changes in the rhizosphere that enhance early plant growth. In this study we investigated the microbial diversity of the rhizoplane from seedlings grown in two soils previously planted to cereal or legume from experimental plots in Gaya, Niger, and Kaboli, Togo. Soils from these legume rotation and continuous cereal plots were placed into containers ...
Aufsatz
Vegetation changes in a river oasis on the southern rim of the Taklamakan Desert in China between 1956 and 2000
(2003-11-26)
The indigenous vegetation surrounding the river oases on the southern rim of the Taklamakan Desert has drastically diminished due to overexploitation as a source of fodder, timber and fuel for the human population. The change in the spatial extent of landscape forms and vegetation types around the Qira oasis was analyzed by comparing SPOT satellite images from 1998 with aerial photographs from 1956. The analysis was supplemented by field surveys in 1999 and 2000. The study is part of a joint Chinese-European project ...
Aufsatz
Buchkultur im geistlichen Beziehungsnetz
(Baumgärtner, Ingrid (Hrsg.), 2003)