TY - GEN A1 - Schmeißer, Dieter A1 - Irmscher, Klaus A1 - Wagner, Gerd T1 - Photoelectron spectra of Al dopants in 4H-SiC T2 - Materials Science & Engineering B N2 - 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. KW - Photoelectron KW - Spectra KW - 4H-SiC Y1 - 2003 SN - 0921-5107 SN - 1873-4944 VL - 102 IS - 1-3 SP - 284 EP - 288 ER - TY - CHAP A1 - Wagner, Gerd A1 - Antoniou, Grigoris A1 - Tabet, Said T1 - The Abstract Syntax of RuleML - Towards a General Web Rule Language KW - Web Rule Y1 - 2004 ER - TY - CHAP A1 - Guizzardi, Giancarlo A1 - Wagner, Gerd A1 - Herre, Heinrich ED - Motta, Enrico T1 - On the foundations of UML as an ontology representation language T2 - Engineering knowledge in the age of the semantic web, 14th international conference, proceedings, EKAW 2004, Whittlebury Hall, UK, October 5 - 8, 2004 KW - UML KW - Ontology Representation Language Y1 - 2004 SN - 3-540-23340-7 SP - 47 EP - 62 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Guizzardi, Giancarlo A1 - Wagner, Gerd ED - Giorgini, Paolo T1 - Towards Ontological Foundations for Agent Modelling Concepts using the Unified Foundational Ontology (UFO) T2 - Agent oriented information systems, 6th international bi-conference workshop, revised selected papers, AOIS 2004, Riga, Latvia, June 8, 2004, Bd. 2 Y1 - 2005 SN - 3-540-25911-2 EP - 110 PB - Springer CY - Berlin ER - TY - GEN A1 - Analyti, Anastasia A1 - Antoniou, Grigoris A1 - Damasio, Carlos Viegas A1 - Wagner, Gerd T1 - Negation and Negative Information in the W3C Resource Description Framework T2 - Annals of Mathematics, Computing & Teleinformatics Y1 - 2004 VL - 1 IS - 2 SP - 25 EP - 34 ER - TY - CHAP A1 - Antoniou, Grigoris A1 - Bikakis, Antonis A1 - Wagner, Gerd ED - Antoniou, Grigoris ED - Boley, Harold T1 - A System for Nonmonotonic Rules on the Web Y1 - 2004 ER - TY - CHAP A1 - Guizzardi, Giancarlo A1 - Wagner, Gerd T1 - Some applications of a unified foundational ontology in business modeling Y1 - 2005 ER - TY - CHAP A1 - Wagner, Gerd A1 - Taveter, Kuldar ED - Zhong, Ning T1 - Towards radical agent-oriented software engineering processes based on AOR modeling T2 - Proceedings, IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT 2004), Beijing, China, September 20 - 24, 2004 Y1 - 2004 SN - 0-7695-2101-0 SP - 509 EP - 512 PB - IEEE Computer Society CY - Los Alamitos, Calif. [u.a.] ER - TY - CHAP A1 - Wagner, Gerd A1 - Taveter, Kuldar T1 - Towards radical agent-oriented software engineering processes based on AOR modeling Y1 - 2005 ER - TY - GEN A1 - Guizzardi, Renata A1 - Wagner, Gerd A1 - Aroyo, Lora T1 - Knowledge management in learning communities T2 - The ICFAI Journal of Knowledge Management KW - knowledge management Y1 - 2005 VL - 3 IS - 3 SP - 30 EP - 46 ER - TY - CHAP A1 - Guizzardi, Giancarlo A1 - Wagner, Gerd A1 - Guarino, Nicola A1 - Sinderen, Marten van ED - Persson, Anne T1 - An Ontologically Well-Founded Profile for UML Conceptual Models T2 - Advanced information systems engineering, 16th international conference, proceedings, CAiSE 2004, Riga, Latvia, June 7 - 11, 2004 Y1 - 2004 SN - 3-540-22151-4 SP - 112 EP - 116 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Wagner, Gerd ED - Giorgini, Paolo T1 - AOR Modelling and Simulation: Towards a General Architecture for Agent-Based Discrete Event Simulation T2 - Agent oriented information systems, 5th international bi-conference workshop, AOIS 2003, Melbourne, Australia, July 14, 2003 and Chicago, IL, USA, October 13th, 2003 Y1 - 2004 SN - 3-540-22127-1 SP - 174 EP - 188 PB - Springer CY - Berlin [u.a] ER - TY - CHAP A1 - Luin, Jeroin van A1 - Tulba, Florin A1 - Wagner, Gerd T1 - Remodeling the Beer Game as an Agent-Objekt-Relationship Simulation Y1 - 2004 ER - TY - CHAP A1 - Guizzardi, Giancarlo A1 - Wagner, Gerd ED - Grundspenkis, Janis ED - Kirikova, Marite T1 - A Unified Foundational Ontology and some Applications of it in Business Modeling T2 - Data integration over the Web, CAiSE '04, The 16th Conference on Advanced Information Systems Engineering, Riga, Latvia, 7 - 11 June, 2004, proceedings KW - Ontology KW - Business Modeling Y1 - 2004 SN - 9984-9767-3-4 SP - 129 EP - 143 PB - Fac. of Computer Science and Information Technology CY - Riga ER - TY - CHAP A1 - Analyti, Anastasia A1 - Antoniou, Grigoris A1 - Damasio, Carlos Viegas A1 - Wagner, Gerd ED - Gil, Yolanda T1 - Stable model theory for extended RDFontologies T2 - The Semantic Web - ISWC 2005, 4th International Semantic Web Conference, ISWC 2005, Galway, Ireland, November 6 - 10, 2005, proceedings Y1 - 2005 SN - 3-540-29754-5 SP - 21 EP - 36 PB - Springer CY - Berlin [u.a.] ET - 1. ed. ER - TY - CHAP A1 - Boley, Harold A1 - Dean, Mike A1 - Kifer, Michael A1 - Tabet, Said A1 - Wagner, Gerd T1 - RuleML Position Statement Y1 - 2005 UR - http://www.w3.org/2004/12/rules-ws/paper/96/ ER - TY - CHAP A1 - Boley, Harold A1 - Wagner, Gerd A1 - Mei, Jing T1 - RDF/RuleML Interoperability Y1 - 2005 UR - http://www.w3.org/2004/12/rules-ws/paper/93/ ER - TY - CHAP A1 - Tabet, Said A1 - Wagner, Gerd A1 - Spreeuwenberg, Silvie A1 - Vincent, Paul D. A1 - Jacques, Gonzaques T1 - OMG Production Rule Representation - Context and Current Status Y1 - 2005 UR - http://www.w3.org/2004/12/rules-ws/paper/53/ ER - TY - CHAP A1 - Wagner, Gerd ED - Eisinger, Norbert ED - Maluszynski, Jan T1 - Rule Modeling and Markup Y1 - 2005 ER - TY - CHAP A1 - Giurca, Adrian A1 - Wagner, Gerd ED - Adi, Asaf ED - Stoutenburg, Suzette T1 - Towards an Abstract Syntax and Direct-Model Theoretic Semantics for RuleML T2 - Rules and rule markup languages for the semantic web, first international conference, proceedings, RuleML 2005, Galway, Ireland, November 10 - 12, 2005 Y1 - 2005 SN - 3-540-29922-X SP - 45 EP - 55 PB - Springer CY - Berlin [u.a.] ER -