Bahntechnik II: Innovative Maßnahmen für das Bahnstromnetz Die ÖBB-Infrastruktur-Garant für eine professionelle Betriebsabwicklung

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Methods for MHD plasma equilibria mathematical modeling

An overview of the state of the art and of the MHD plasma equilibrium modeling is given in the paper. The statements of the problems, their mathematical properties, and numerical algorithms are considered.     

EPMCC 2001 — Forum der Telekommunikationspioniere des 21. Jahrhunderts

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Willibald Riedler emeritiert — Ein Rückblick auf das Leben und Wirken eines großen Österreichers

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Ion acceleration in plasma injected into spatiotemporally modulated supercritical relativistic electron beam

We have experimentally studied the acceleration of injected plasma ions in the collective fields of a virtual cathode and a space-charge wave of a high-current relativistic electron beam modulated in time and space. The temporal modulation is produced by the field of the virtual cathode that exhibited low-frequency relaxation in the presence of plasma, while the spatial modulation was provided by a spatially-periodic magnetic field.     

Persönliches

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Prinzipien der Powerline Communication

The liberalization of the electricity and telecommunications markets has paved the way for harnessing existing electricity supply networks to transfer data from the low-voltage transformer station right through to every mains socket in a building. Powerline communication (PLC) allows for coupling power supply with data transmission. The modulation or demodulation calls for state-of-the-art, fast chip technologies as well as algorithms. According to powerline companies, the first generation of products is to be launched in the year 2001. Further development of this system depends completely on the regulation of the respective frequency levels. If regulatory measures and the market were to favor powerline technology, electric utility companies could come to play a role as telecom providers.     

Entwicklungen und Nachweisuntersuchungen von Diagnosemethoden für Wasserkraftgeneratoren

In cooperation between two utilities and two generator manufacturers the stator windings of two severely loaded motor generator sets were tested with different online methods. The selected test methods reflect the different diagnosis philosophies of these companies. In addition to different PD measuring systems, analysis of the cooling air with respect to ozone and other gaseous reaction products as well as structureborne sound diagnosis were applied. To check the coincidence of the diagnosis the test results have been individually evaluated and separately commented in this paper. Differences are discussed in a common conclusion. On account of various types of insulation defects interesting findings have been obtained.