Abstract: A ceramic microreactor for carrying out reactions having a large heat of reaction which has at least three interior spaces, with at least one interior space having internal buffers whose shape, number and positioning ensure homogeneous flow, is described. The microreactor is built up as a monolith from at least seven plate-shaped layers of inert ceramic material, preferably aluminium oxide, which form an upper heating/cooling space, a central reaction space and a lower heating/cooling space. One interior space has a coating of a catalyst comprising noble metal. The shape, number and positioning of the internal buffers is determined by means of flow simulation calculations; the internal buffers preferably have a lozenge shape. The microreactor displays very good selectivity in reactions having a large heat of reaction, in particular in heterogeneous gas-phase reactions, and is used in particular for hydrogen production and/or hydrogen purification in fuel cell technology.

Abstract: A is a pivot connection and detent mechanism for a vehicle mirror (10) comprising:a mounting bracket (14) that is attached to a motor vehicle having at least one pivot connection member a mirror assembly (11) including a mirror and at least one pivot connection for pivotal connection to the pivot connection member or members of the mounting bracket to allow angular movement of the mirror assembly (11) with respect to the mounting bracket (14), at least one detent recess (30) on at least one of the pivot connection members of either the mounting bracket (14) or the mirror assembly (11), a resilient arm held at its first end with respect to the pivot connection member that connects to the other pivot connection member with the detent recess (30), and a detent member (30) located at the second end of the resilient arm (40). The detent member (44) is positioned so that it engages the detent recess (30) to hold the mirror assembly (11) with respect to the mounting bracket (14).