Abstract: A fiber-reinforced composite material having a sensor array of a plurality of sensors for structural health monitoring of the composite material, and also having electrical conducting paths incorporated in the composite material and extending through the composite material. The electrical conducting paths are arranged in a first group and in a second group different from the first group, with the first group extending in a first direction, and the second group extending in a second direction and intersecting the electrical conducting path of the first group. The intersecting paths form together with the conducting paths of first group a network of n row conductors and m column conductors. There is also a signal processing means for monitoring at least one electrical characteristic of the conducting paths.

Abstract: In a fiber-reinforced composite material (1) comprising a sensor array of a plurality of sensors for structural health monitoring of the composite material (1), wherein electrical conducting paths (4, 5) are incorporated into the composite material (1) and extend through the composite material, the electrical conducting paths are arranged in a first group and in a second group different from the first group, wherein the electrical conducting paths of the first group extend in the same direction, the electrical conducting paths of the second group also extend in the same direction and intersect the electrical conducting paths of the first group and thus form together with the conducting paths of the first group a network of n row conductors (4) and m column conductor (5), and a signal processing means for monitoring at least one electrical characteristic of the conducting paths is provided, the state of the composite material (1) as well as damages, for example by fiber cracks, should be detected spatially res

Abstract: The present invention concerns a process and a device for controlling and regulating the nitrification and denitrification phase in waste water treatment, the redox potential (U.sub.R) of the waste water being measured. In a first embodiment, the inflection point of the redox potential is determined statistically. For this a series of measurements of the redox potential are carried out at separate intervals of time, which measurements first are determined and then combined for determining an increase value. The difference between sequential increase values is compared, and a first switch signal (S1) is generated which contains information concerning this result. In a another embodiment, the difference of the redox potential (U.sub.R) between maximum and switching off the denitrification phase is determined and compared with the corresponding value of the previous measurement cycle. Depending on the comparison result, a second switch signal (S2) is generated.