A method of treating carbon fibrils and carbon fibril structures such as assemblages, aggregates and hard porous structures with a plasma to effect an alteration of the surface or structure of the carbon fibril or fibrils. The electronic device includes a housing having a battery compartment defined therein. Detecting results of these detecting rules are integrated by weighting them according to their accuracy, such that occurrence of advertising can be located. A method of manufacturing a particular embodiment of the proposed device is also described. The disposable portion contains a receptacle adapted to receive and mechanically secure the reusable portion to the disposable portion of the assembly. In the discrimination medium, the support body 31 and the pattern 20 appear to be the same color when viewed from a specific angle.