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 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 hydrodynamic apparatus for cleaning channels and for monitoring channels is provided for pipes and channels. A disadvantage of all conventional bottom floor cleaners, flushing heads, and channel-cleaning nozzles is that during the cleaning process no observation and determination of the soiling state or, respectively, of the cleaning state of the channel and no recognition of damaged areas in the channel is possible. According to the invention, a monitoring unit (6) is installed selectively in or at the channel-cleaning apparatus. For this purpose, for example, a hollow space (11) is furnished at the bottom floor cleaner (S), wherein the monitoring unit (6) is partly integrated into the hollow space (11). The monitoring unit (6) exhibits a camera module (7) or two camera modules (7a and 7b). A video emitter (15) is coordinated to each camera module (7). The transmission to a video receiver (V) is performed without cable wireless from the video emitter (15).

Abstract: A hydrodynamic tool for the cleaning of pipes and channels exhibits a pressurized water-entry inlet opening (2) connected to pressurized water-discharge outlet openings (4) through water guide channels (3). The water guide channels (3) are continuously connected to the pressurized water-entry inlet opening (2) with a hose connection (2a). The water guide channels (3) exhibit a largest possible deflection radius (r) and partially converge into one another. At least two water guide channels (3) rest with the innermost point of the diameter (d.sub.W1) at the center point (M) and with their outermost point of the diameter (d.sub.W1) at the outer diameter (d.sub.E) of the pressurized water-entry inlet opening (2). The water guide channels (3), corresponding to the arrangement of the pressurized water-discharge outlet openings (4), are either merging into the end of the deflection radius (r) or into the straight line region (3.G) and in an angle (.alpha.

Abstract: A hydrodynamic nozzle for the cleaning of pipes and channels exhibits a distribution chamber (7), joining to the pressurized water-entrance opening (4), wherein the pressurized water-discharge opening (5a, 5b) join into the distribution chamber (7) through channels (6a and 6b). The distribution chamber (7) exhibits a cone-shaped water subdivider (8), to which a defined radius (r1) follows, wherein the curvature of the radius (r1) is opposite to that of the pressurized water-entrance opening (4). The channels (6a and 6b) are merging tangentially at this radius (r1). Furthermore, the nozzle body (1) can be subdivided into an upper part (2) and a lower part (3), and can exhibit a separate form element (14), which forms the water subdivider (8) and the radius (r1), in the lower part (3). The degree of effectiveness is substantially increased with the nozzle according to the invention and thus the axial pressure of the exiting beam of liquid and the cleaning effect is substantially increased.

Abstract: A shaping tool for the stock-removal machining of wheelsets. The tool contains a shell-end milling cutter comprised of a disc-shaped body with a multiplicity of cutting edges which overlap each other and are disposed spirally staggered on pitch circles on such disc-shaped body.

Abstract: A head restraint for rear seats of convertibles is attached to a U-shaped roll-over bar and can be displaced with the roll-over bar. The roll-over bar can be raised from a lowered position into a support position and spans to a large extent the width of the interior of the vehicle. The lateral legs of the roll-over bar are equally curved along a rear wall of the rear seat rest with a center of curvature on the seat side of the rear seat rest.

Abstract: In a safety device for the occupant of the central rear seat position in a motor vehicle the arm-rest present between the front seats is used for his or her effective protection in the case of a frontal collision. A pivoting drive, which engages the arm-rest, pivots the arm-rest out of its position extending approximately horizontally in the longitudinal direction of the vehicle towards the front seat back-rest in the case of a crash. The pivoting drive is connected to a sensor which detects a vehicle deceleration, and which trips the pivoting drive to erect the arm-rest when a prescribed value of the integrated vehicle deceleration is exceeded.

Abstract: A side guard or lateral protection arrangement for motor vehicles, wherein at least one reinforcement, extending substantially in the longitudinal direction of the vehicle, is arranged within each of the side doors. The reinforcements are braced in case of a force effective in the longitudinal direction of the vehicle, with each end directly or indirectly against a component fixedly mounted to the vehicle or against a further reinforcement associated with an adjacent door. This bracing takes place in the longitudinal direction of the vehicle. The reinforcements are axially adjustable in their lengths so as to bridge a space between an end of the reinforcement means and the component fixedly mounted to the vehicle or further reinforcement, which space results from manufacturing tolerances in the construction of the motor vehicle.

Abstract: A longitudinal bearer support for a forward longitudinal bearer supported under angular bending at the end wall of a self-supporting motor vehicle body, in which the end wall is locally bulged-out in the direction of the vehicle end within the connecting area of each forward longitudinal bearer to provide a form-rigid body; each forward longitudinal bearer receives a forking in its approach at the form-rigid body, providing four arms of which the two lower arms extend to the subfloor while the two upper arms terminate within the area of the form-rigid body.

Abstract: A lateral protection for motor vehicles in which at least one reinforcement extending essentially in the vehicle longitudinal direction is arranged on the inside of each door, whereby in case of an external force influence or action which occurs in the vehicle longitudinal direction the reinforcements, preferably constructed as hollow bearers, are supported in the vehicle longitudinal direction with one end each either directly or indirectly at a fixed structural part such as, for example, at an upright column or at a wheel casing or at a further reinforcement belonging to an adjacent door.