@misc{SchmeisserIrmscherWagner, author = {Schmeißer, Dieter and Irmscher, Klaus and Wagner, Gerd}, title = {Photoelectron spectra of Al dopants in 4H-SiC}, series = {Materials Science \& Engineering B}, volume = {102}, journal = {Materials Science \& Engineering B}, number = {1-3}, issn = {0921-5107}, pages = {284 -- 288}, abstract = {Al-doped 4H-SiC epitaxial layers were grown in a hot-wall chemical vapor deposition (CVD) system on commercial 4H-SiC substrates (CREE). The incorporation of Aluminum has been studied in the concentration range from 2*1014cm-3 up to 3*1020cm-3. Epitaxial layers with doping concentration NA-ND> 1019cm-3 were studied by HV-TEM and synchrotron radiation investigations. In the concentration range from 1*1019cm-3 to 3*1020 cm-3, measured by SIMS and Hall investigations, no Aluminum precipitation were detected in the grown layers. For SiC samples with an Al concentration of 1020cm-3 we have been able to detect the Al2p photoemission signal. The Al2p signal is recorded through the oxide layer (thickness of about 0.4nm), it has a main contribution at a binding energy of 73eV which corresponds to the energy typical for elemental Al0. In spectra excited with higher photon energies the sampled photoelectrons originate from deeper layers. In these data we notice an additional shoulder in the Al2p signal at around 71eV. The evidence of two contributions is attributed to the fact that Al is incorporated at different lattice sites. As the latter data represent more bulk like properties we argue that Al in the bulk SiC occupies both, substitutional lattice sites and interstitial sites while in the surface near regions Al is found only at substitutional lattice sites.}, language = {en} } @incollection{WagnerAntoniouTabet, author = {Wagner, Gerd and Antoniou, Grigoris and Tabet, Said}, title = {The Abstract Syntax of RuleML - Towards a General Web Rule Language}, language = {en} } @incollection{GuizzardiWagnerHerre, author = {Guizzardi, Giancarlo and Wagner, Gerd and Herre, Heinrich}, title = {On the foundations of UML as an ontology representation language}, series = {Engineering knowledge in the age of the semantic web, 14th international conference, proceedings, EKAW 2004, Whittlebury Hall, UK, October 5 - 8, 2004}, booktitle = {Engineering knowledge in the age of the semantic web, 14th international conference, proceedings, EKAW 2004, Whittlebury Hall, UK, October 5 - 8, 2004}, editor = {Motta, Enrico}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {3-540-23340-7}, pages = {47 -- 62}, language = {en} } @incollection{GuizzardiWagner, author = {Guizzardi, Giancarlo and Wagner, Gerd}, title = {Towards Ontological Foundations for Agent Modelling Concepts using the Unified Foundational Ontology (UFO)}, series = {Agent oriented information systems, 6th international bi-conference workshop, revised selected papers, AOIS 2004, Riga, Latvia, June 8, 2004, Bd. 2}, booktitle = {Agent oriented information systems, 6th international bi-conference workshop, revised selected papers, AOIS 2004, Riga, Latvia, June 8, 2004, Bd. 2}, editor = {Giorgini, Paolo}, publisher = {Springer}, address = {Berlin}, isbn = {3-540-25911-2}, pages = {124}, language = {en} } @misc{AnalytiAntoniouDamasioetal., author = {Analyti, Anastasia and Antoniou, Grigoris and Damasio, Carlos Viegas and Wagner, Gerd}, title = {Negation and Negative Information in the W3C Resource Description Framework}, series = {Annals of Mathematics, Computing \& Teleinformatics}, volume = {1}, journal = {Annals of Mathematics, Computing \& Teleinformatics}, number = {2}, pages = {25 -- 34}, language = {en} } @inproceedings{AntoniouBikakisWagner, author = {Antoniou, Grigoris and Bikakis, Antonis and Wagner, Gerd}, title = {A System for Nonmonotonic Rules on the Web}, editor = {Antoniou, Grigoris and Boley, Harold}, language = {en} } @incollection{GuizzardiWagner, author = {Guizzardi, Giancarlo and Wagner, Gerd}, title = {Some applications of a unified foundational ontology in business modeling}, language = {en} } @inproceedings{WagnerTaveter, author = {Wagner, Gerd and Taveter, Kuldar}, title = {Towards radical agent-oriented software engineering processes based on AOR modeling}, series = {Proceedings, IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT 2004), Beijing, China, September 20 - 24, 2004}, booktitle = {Proceedings, IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT 2004), Beijing, China, September 20 - 24, 2004}, editor = {Zhong, Ning}, publisher = {IEEE Computer Society}, address = {Los Alamitos, Calif. [u.a.]}, isbn = {0-7695-2101-0}, pages = {509 -- 512}, language = {en} } @incollection{WagnerTaveter, author = {Wagner, Gerd and Taveter, Kuldar}, title = {Towards radical agent-oriented software engineering processes based on AOR modeling}, language = {en} } @misc{GuizzardiWagnerAroyo, author = {Guizzardi, Renata and Wagner, Gerd and Aroyo, Lora}, title = {Knowledge management in learning communities}, series = {The ICFAI Journal of Knowledge Management}, volume = {3}, journal = {The ICFAI Journal of Knowledge Management}, number = {3}, pages = {30 -- 46}, language = {en} } @inproceedings{GuizzardiWagnerGuarinoetal., author = {Guizzardi, Giancarlo and Wagner, Gerd and Guarino, Nicola and Sinderen, Marten van}, title = {An Ontologically Well-Founded Profile for UML Conceptual Models}, series = {Advanced information systems engineering, 16th international conference, proceedings, CAiSE 2004, Riga, Latvia, June 7 - 11, 2004}, booktitle = {Advanced information systems engineering, 16th international conference, proceedings, CAiSE 2004, Riga, Latvia, June 7 - 11, 2004}, editor = {Persson, Anne}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {3-540-22151-4}, pages = {112 -- 116}, language = {en} }