The invention relates to a wind turbine, in which a plurality of supporting beams (16) are arranged along a tripod mast (2), which stands on a foundation consisting of a circular rail (13) anchored in the ground having a rotatable base frame (8), wherein a generator is provided on each supporting beam, which generator is coupled to a predetermined number of rotors (4), which are reinforced by a closing disc (12) consisting of a plurality of segments (29), wherein the tripod mast (2) has as top closure a cross-beam (1) tensioned with four cables (5) as storm protection, which cross-beam tensions the entire system with four cables (5) and is rotatably mounted in the centre of the mast, with the tripod mast being freely rotatable.

The invention relates to a method for determining the ranking of the perception intensity of stimuli (S1,...,Sn) from a test set of stimuli in a test person (1) by means of a brain-computer interface (20), wherein a reference set of stimuli (Z, V1,..., Vn) is compiled from at least one target stimulus (Z) and a predefined number of comparison stimuli (V1,..., Vn), wherein in a training phase a) the individual stimuli (Z, V1,..., Vn) from the reference set are applied to the test person (1), b) wherein after the application of every stimulus (Z, V1,..., Vn) from the reference set the reaction of the test person (1) is ascertained in that the (1) EEG measurement data (U1,..., Un) of the test person caused by the stimulus (Z, V1,..., Vn) or having a time relationship with said stimulus are determined, and these EEG measurement data (U1,..., Un) are assigned to the respective stimuli (Z, V1,..., Vn), wherein for each stimulus (Z, V1,..., Vn) at least one characteristic vector is created from the EEG measurement data (U1,..., Un) of all EEG channels, and c) wherein the characteristic vectors, obtained in this way, of the stimuli (Z, V1,..., Vn) from the reference set undergo a classification analysis, wherein a differentiation function (F) is determined to delimit the set of characteristic vectors of the comparison stimuli (V1,..., Vn) from the set of characteristic vectors of the target stimulus (Z), wherein the differentiation factor specifies whether a stimulus (Z, V1,..., Vn) is a target stimulus (Z) or a comparison stimulus (V1,..., Vn). In an investigation phase d) a test set of stimuli (S1,..., Sm) is applied to the test person (1), wherein the test set comprises stimuli (S1,..., Sm) at least some of which or all of which differ from the stimuli (Z, V1,..., Vn) of the reference set, e) wherein after the application of every stimulus (S1,..., Sm) of the test set the EEG measurement data (U1,..., Un) of the test person (1) are determined in the same way as in step b) and on the basis of the EEG measurement data (U1,..., Un) a characteristic vector is first created for each stimulus (S1,..., Sm) and f) wherein the differentiation function (F) is applied to the characteristic vector of each individual stimulus (S1,..., Sm) of the test set and thus a first measurement value is determined for matching each stimulus (S1,..., Sm) of the test set to the target stimulus (Z) of the reference set, and g) wherein a ranking of the perception intensity of the stimuli (S1,..., Sm) of the test set is created according to the first measurement value for matching to the target stimulus (Z) of the reference set.

The invention relates to a method for comparing two graphs, wherein - each of the graphs (11, 12) is assigned an acyclically oriented subgraph comprising all of the nodes (A-F; A'-J') of the respective graph (11, 12), - each node (A-F; A'-J') of the two graphs (11, 12) is assigned respective edge information with respect to the edges (d, h) which are contained in each graph (11, 12) but not in the acyclically oriented subgraphs (110, 120) assigned to the graphs (11, 12), - each node (A-F; A'-J') of the two graphs (11, 12) is optionally assigned additional respective information, - on the basis of the sheet nodes (G, H) of the acyclically oriented subgraphs (110, 120) for each node, in particular using a post-order traversal, a respective hash value based on the edge information assigned to the node and on additional information and the hash values of the child node thereof, in particular the indirect child node thereof, are taken into consideration, - in order to compare the two graphs (11, 12) recursively starting from the root nodes (A, A'), the hash values of corresponding nodes are compared, - if the hash values are identical, the sameness of all of the child nodes of the respective node and the information assigned to the respective node is ascertained, and - if the hash values are different, a) the information assigned to the node and optionally information associated with the edges assigned to the node are compared, and in the event of differences between said information, the two nodes are marked as being different, and b) the child nodes of each node are checked recursively for differences according to the aforementioned criteria.

The invention relates to a method for producing a cast workpiece (1), wherein the method comprises the following method steps: - providing a casting mould (3) with at least one mould core (7) arranged in the casting mould (3); - introducing molten metal (2) into the casting mould (3); - waiting for a period of time until at least the outer contour of the molten metal (2) has solidified and the workpiece (1) has formed from the molten metal (2); - removing the workpiece (1) from the casting mould (3); - shattering the mould core (7), this method step being carried out even before the workpiece (1) has cooled down completely from the casting process. For shattering the mould core (7), a hammer head (10) is brought up against a fixed energy transfer surface (12) of the workpiece (1) and the energy transfer surface (12) is acted upon, in particular struck, by means of the hammer head (10).

The invention relates to a valve (10) for use in low temperature regions, in particular below 40 °C, preferably below 100 °C, particularly preferable below 150 °C, comprising a flow channel (1), and a closing element (3) that is adjustable relative to a valve seat (2) in the flow channel (1), by way of which a defined flow cross-section can be freed for the medium flowing in the flow channel (1). The valve (10) comprises a valve gasket (5), which in a closed state of the valve (10) seals the flow channel (1) between valve seat (2) and closing element (3). According to the invention, the valve gasket (5) is made of a polyketone.