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Multi-level topologies reduce the requirements on inductors and filters, however, given the high number of series connected semiconductors, it is still unclear if they are a suitable option to achieve ultra-high efficiency while maintaining a reasonable power density. For this purpose, an extensive quantitative evaluation of different topologies is carried out, to determine the required volume for...
Hintergrund Die mobile Teledermatoskopie ist eine vielversprechende Technik zur Ergänzung oder Substitution einer dermatologischen Untersuchung. Fragestellung In dieser Pilotstudie wurde das Ergebnis teledermatoskopischer Konsultationen mit den Ergebnissen aus klinischen Konsultationen sowie histologischen Resultaten verglichen. Methodik Konventionelle und dermatoskopische Fotos von Einzelläsionen...
DC power distribution systems for data centers, industrial applications and residential areas are expected to provide higher efficiency, reliability and lower cost compared to ac systems. Accordingly they have been an important research topic in recent years. In these applications an efficient power factor correction rectifier, supplying a dc distribution bus from the conventional three-phase ac mains...
Solid-state-transformer technology pushes the specifications of electric transformers in the high-power medium-frequency range. This combination results in larger-sized transformers operating at higher frequencies whereby parasitic phenomenon should be carefully accounted for. This paper presents an analytical description of the limiting factors and the connection between frequency/power rating and...
The activation of the coagulation system in cancer patients is a well-known phenomenon responsible for recurrent clinical problems. A number of fascinating molecular mechanisms have been recognized showing that the tumor not only activates the coagulation system, but vice versa, activated coagulation proteins are able to induce molecular effects in tumor cells. The molecular basis is the expression...
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