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The new Soft Switching Three Level Inverter (S3L – Inverter) is of striking simplicity and is therefore inexpensive. Because of the underlying principle, it works without losses and thus with maximum efficiency. The inverter is easily controlled, has EMC friendly inherent di/dt- and du/dt limitation, and can be built using low-cost standard semiconductors.
Field of use: electric drives, solar power inverter, wind power inverter, uninterruptible power supplies (UPS).
Asthma bronchiale, hayfever or neurodermatitis – allegies are on the increase in Western European industrial countries. According to the Robert-Koch-Institute…
On Wednesday, 14 October 2015 the research icebreaker Polarstern from the Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI),…
The invention describes a process for the production of fiber-
reinforced aluminum foam. The composite has advantages
compared to the non-reinforced foam like higher mechanical
properties and greater stiffness. By the fibers the influence of
the non-homogeneous pore distribution can be reduced. Withe
respective reinforcement fibers the energy absorption can be
increased to without increasing the global density.
It sounds rather simple: in order to restore the original high level of biodiversity in our rivers, they should be renaturalised, i.e. returned to their…
African straw-coloured fruit bats fulfil important ecosystem functions by dispersing seeds and pollen during their flights. Researchers from the Max Planck…