Various processes for heating semiconductor wafers is disclosed. In order to reduce, in a simple fashion, the volume required for the end turns of the form-wound coils, the stator is formed of segments that have a substantially circular arc-shaped cross-section and can be combined into a stator by adding one or more other segments having the same design. Text phrases are extracted from information associated with establishments known to be near the geographic location specified in the geo-tag of the image. It also solves problems with control systems based on electrical components, which might drift away with temperature and age. The valve seal portion is coated by a thin diamond-like carbon coating having hardness between Hv 50 and Hv 500 in Vickers hardness.