Abstract: A wind farm with at least two wind turbines (1, 2, 3, 4) connected to a power grid is provided, said wind farm further comprising a control unit (5) connected to said at least two wind turbines (1, 2, 3, 4), and a sensor unit (6) connected to said power grid and said control unit (5), wherein said sensor unit (6) is adapted to measure the grid frequency of said power grid and to transmit said measured grid frequency to said control unit (5), and wherein said control unit (5) is adapted to control the output of real power of said wind farm according to said measured grid frequency.

Abstract: A vehicle door or body section, especially for a passenger motor vehicle with a door body or body section made essentially of an outer and of an inner body panel and with a window arranged above the same which essentially consists of an approximately rectangularly shaped vertically displaceable side window and an adjoining approximately triangularly shaped window part, whereby for purposes of opening the window the side window and the window part can be lowered completely into the door body or body section in that the window part is pivotal within the area of its corner opposite the side window about an axis arranged approximately perpendicularly to its window plane; the side window and window part extend thereby in a common plane and the side window is provided within the area of its upper corner facing the window part with an inclination in such a manner that in the lowered condition of the side window and of the window part, the front edge of the window part extends adjacent the inclination at a distance w