Tagungsbeiträge

Fröber, Ulrike; Stubenrauch, Mike; Voges, Danja; Müller, René; Witte, Hartmut; Hoffmann, Martin
Biomikrosysteme zur Kultivierung von Indikatororganismen für Umwelt-Monitoring, Gefahrstoffdetektion und Zytodiagnostik. - In: 4. Workshop "Chemische und biologische Mikrolabortechnik", (2008), insges. 2 S.

Lorenz, Pierre; Lebedev, Vadim; Niebelschütz, Florentina; Hauguth, Sindy; Ambacher, Oliver; Schäfer, Jürgen A.; Krischok, Stefan
Characterization of GaN-based lateral polarity heterostructures. - In: Physica status solidi, ISSN 1610-1642, Bd. 5 (2008), 6, S. 1965-1967

http://dx.doi.org/10.1002/pssc.200778550

Tonisch, Katja; Buchheim, Carsten; Niebelschütz, Florentina; Donahue, Mary; Goldhahn, Rüdiger; Cimalla, Volker; Ambacher, Oliver
Piezoelectric actuation of all-nitride MEMS. - In: Physica status solidi, ISSN 1610-1642, Bd. 5 (2008), 6, S. 1910-1913

http://dx.doi.org/10.1002/pssc.200778423

Niebelschütz, Merten; Cimalla, Volker; Ambacher, Oliver; Machleidt, Torsten; Franke, Karl-Heinz; Ristic, J.; Grandal, J.; Sánchez-García, M. A.; Calleja, E.
Space charged region in GaN and InN nanocolumns investigated by atomic force microscopy. - In: Physica status solidi, ISSN 1610-1642, Bd. 5 (2008), 6, S. 1609-1611

http://dx.doi.org/10.1002/pssc.200778533

Cepite, Daiga; Jakovics, Andris; Halbedel, Bernd; Krieger, Uwe
Modelling of EM glass convection. - In: Compel, ISSN 2054-5606, Bd. 27 (2008), 2, S. 387-398

An application of external magnetic field to intensify the stirring process of electro-conducting melts is a well-known industrial method. In that case melt flows not only due to the temperature differences caused by thermal boundary conditions (BC) and Joule heat production but also due to a contribution of the Lorentz force. In our case the character of opaque weakly conducting glass melt flow with temperature - dependent physical properties has been investigated. Homogeneity of temperature is one of the pre-requisites for the high quality of the special glasses. The impact of the interaction between the external homogeneous magnetic field and the electrical current flowing in the melt on the melt flow has been analysed experimentally in a laboratory crucible system. The measurements of total Joule heat production rate and the corresponding vertical temperature are used as the essential information for verification of the presented mathematical model. Simulations show EM-field, HD and temperature distribution in 3D geometry of the melt. ANSYS software is used for numerical modelling of coupled EM, hydrodynamics and heat transfer processes. A good qualitative agreement between the numerical and experimental data has been obtained. Numerical proof has been derived that non-inductive approximation is appropriate for the conditions of the experiment. Multiple choices of thermal boundary conditions are discussed and its impact on the total heat balance and temperature distribution in the melt.

http://dx.doi.org/10.1108/03321640810847670