A chemical microreactor suitable for generation of hydrogen fuel from liquid sources such as ammonia, methanol, and butane through steam reforming processes when mixed with an appropriate amount of water contains capillary microchannels with integrated resistive heaters to facilitate the occurrence of catalytic steam reforming reactions. Each of the trading processes has a trading strategy embodied in a decision table. Embodiments of projection objectives according to the invention achieve a very high numerical aperture of NA>1 in conjunction with a large image field, and are distinguished by a good optical correction state and moderate overall size. The first heat exchanger exchanges heat between the combustion path and a first heating circuit which includes the fuel cell. The carrier board is a single-sided board, a double-sided board, a multi-layered board, or a combination thereof, and the single-sided board, the double-sided board, and multi-layered board can be flexible boards, rigid boards, or composite boards combining flexible and rigid boards. The string includes central monofilaments surrounded by multifilament yarns, the assembly being impregnated and coated with polyurethane and is subjected to tensile bending after it has been formed.