Abstract: A photoresist suitable for the production of structures in the submicron range contains the following components:a polymer component with carboxylic acid anhydride functions and carboxylic acid tert. butyl ester groupsa photoinitiator which releases an acid when exposed anda suitable solvent.

Abstract: A method of channel allocation for a communication connection to a radio interface in a mobile communication system with spatial subscriber separation. The method includes comparing the disclosed allocation method is to compare the theoretical minimum P.sup.(l) (given optimum spatial separability) to the anticipated downlink transmission power P.sup.(I) for each channel in the selection of a channel. In order to speed up the calculation, the factors allocated to the K communication connections are selected proportional to the dominant eigenvectors u.sub.k (C.sub.k). A low value for the quotient in channel l allows one to conclude that the eigenvector u.sub.k for all K communication connections respectively fits well to the covariance matrices C.sub.k of the other K-1 communication connections and, thus, a good spatial separability is established.

Abstract: A method and apparatus for ascertaining internal stresses in a hardened region to be tested for a component made of a predetermined material includes measuring coercive field strength and amplitude of magnetic Barkhausen noise as a function of mechanical stress and hardness in calibration samples of a predetermined material of known hardness and known internal stress. Calibration functions are ascertained from the measured values indicating the dependency of the hardness and the amplitude of the magnetic Barkhausen noise as functions of the hardness and mechanical stress. The coercive field strength and the amplitude of the magnetic Barkhausen noise is measured in a location-dependent manner over the region of the component to be tested. The measured values of the coercive field strength and the amplitude of the magnetic Barkhausen noise are converted in the region to be tested into location-dependent hardness and into location-dependent mechanical stress using the ascertained calibration functions.