Abstract: UV-stabilized formed structures from aromatic polyether ketones are coated with at least one film-forming polymer containing at least one UV absorber dissolved or dispersed in said film-forming polymer.

Abstract: The invention is directed to a method wherein measures are initiated for accelerating the warm-up of the catalyzer even for a warm engine such as after a warm start thereof. In this way and when there is an interruption of operation, the cooling off of the engine and the catalyzer, which takes place at different rates, and the effect thereof on the conversion rate is opposed. As a consequence thereof, the emission of unwanted exhaust-gas components after a warm start is reduced.

Abstract: An interference type angle measuring device has a graduated disk with a circular graduation. This circular graduation is scanned by a scanning device, which is constructed as a monolithically integrated optical circuit with two diametrical scanning areas. Simply structured coupling and decoupling grids are used as coupling elements, which have also simply constructed correction grids placed upstream or downstream thereof.

Abstract: In an arrangement with at least one waveguide coupler, two photo beam bundles are supplied to both of the inputs of the waveguide coupler by two input grids and are brought to interference in the coupling area. A damping element is provided in the coupling area of the waveguide coupler for obtaining at the two outputs two signals having a mutual phase shift of other than 180.degree. by two detectors.

Abstract: In an integrated optical arrangement, such as a photoelectric position measuring arrangement, a diffraction grid is scanned by light beam diffraction by a scanning unit having a laser. A light beam bundle emanating from the laser is split by the diffraction grid into two diffraction beam bundles, which are inserted into the top input waveguides of a waveguide coupler by two coupling elements. The two diffraction beam bundles interfere in the waveguide coupler and impinge on three detectors located at three output waveguides of the waveguide coupler for obtaining measured values. For readjustment of the optimal emission wavelength of the laser, an additional diffraction beam bundle emanating from the diffraction grid is entered into said integrated optical sensor arrangement by an additional coupling element. The additional beam bundle triggers a detector for generating a control signal to control the optimal emission wavelength of the laser.