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
Stress and stress monitoring in SiC-Si heterostructures. - In: Physica status solidi, ISSN 1862-6319, Bd. 205 (2008), 4, S. 867-871
http://dx.doi.org/10.1002/pssa.200777785
Spectroscopic investigations of the role of Ge in modifying the Si to SiC conversion process. - In: Surface and interface analysis, ISSN 1096-9918, Bd. 40 (2008), 3/4, S. 794-797
http://dx.doi.org/10.1002/sia.2618
Electron transport properties of indium oxide - indium nitride metal-oxide-semiconductor heterostructures. - In: Physica status solidi, ISSN 1610-1642, Bd. 5 (2008), 2, S. 495-498
https://doi.org/10.1002/pssc.200777455
Electromagnetic control of glass melt flows - theoretical contributions. - In: Sklář a keramik, ISSN 0037-637X, Bd. 57C (2007), Seite 68-73
Powder modification and synthesis with thermal plasma jets. - In: Powder manufacturing & processing, ISBN 978-1-899072-30-9, (2007), S. 9-14
Thermal Plasma jets are useful tools in powder processing. In addition to known thermal spray technologies especially the thermal inductively coupled RF-plasma (ICP) has some benefits for such applications. It consists of 3 conenctric tubes, centred in an induction coil. The principle of plasma generation is similar to the one of induction heating. A large volume plasma with a relatively low velocity is generated, so the dwell time of the axially injected particles in the plasma jet ist high and large particles ca be molten. The absence of electrodes prevents impurities and allows sthe use of reactive gases. This offers a wide range of possibilities in the densifaction, spheroidization and surface modification of powders. Examples are given for the plasma treatment of different materials as well as for the synthesis of nano fine metal and ceramic powoders.
Oxidation of lateral polarity heterostructure GaN. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, O 17.77
Nanolayered and nanoparticle-dispersed WC/C coatings: frictional and wear behavior. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, MM 20.29
Tribological performance of WC/C coatings on rough substrates. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, MM 39.1
AlGaN/GaN-sensors for monitoring of enzyme activity by pH measurements. - In: Advances in III-V nitride semiconductor materials and devices, ISBN 978-1-60423-411-4, (2007), S. 85-87