A method for producing a neuroblast and a cellular composition comprising an enriched population of neuroblast cells is provided. A first dielectric layer is formed on the semiconductor layer. A process is further for producing an X-ray detector, including the steps of producing a phosphor layer from a ceramic material and applying a photodetector layer made from an organic material to the phosphor layer via a spinning, printing or beamjet process or by sticking it on as a film. In a first preferred embodiment, the metal ion is a lanthanum ion. The non-linearity of the power amplifier is estimated in accordance with the signals at the first location using an inverse model. The damping force controller of a motorcycle shock absorber is adapted to regulate the damping force, wherein the extension damping force of the rear wheel shock absorber at the moment at which the vehicle is beginning to jump is regulated to be smaller than the extension damping force for a normal run.