Abstract: The invention relates to a photochemical cell (1) and to a method for the solar-driven decomposition of a starting material, in particular water or carbon dioxide, into a product gas bound therein, in particular hydrogen or carbon monoxide, comprising a supply line (7) for the starting material, a discharge line (9) for the obtained product gas, a first electrode (2) made of a photoelectrically active material and exposed to solar radiation (3?, 3?) during operation, and a second electrode (5), wherein the electrodes (2, 5) are connected to each other in a closed circuit by means of an electron conductor (4) for transporting electrons excited by the solar radiation (3?, 3?) in the first electrode (2) and an ion conductor (6) for transporting ions produced in the decomposition of the starting material, wherein an electrolyte made of a heat-resistant solid material and arranged between the electrodes (2, 5) is provided as the ion conductor (6).

Abstract: Sealing device for a valve upper part (18) comprised of a valve housing (20) and a spindle (22) rotatable therein, in particular for plumbing fixtures. The sealing device is comprised of a base disk (32) fixedly associated with the valve housing (20) and a control disk (34) which lies rubbing against the base disk and controlling the water flow through the valve upper part (18). The base disk (32) and control disk (34) are produced from ceramic or ceramic type material. A sealing surface of the base disk (32) facing away from the control disk is held urged against a sealing ring (36) of rubber or rubber like material. The sealing surface is formed by a ring shaped projecting edge part (38) on the base disk (32) or, as the case may be, on the sealing ring (36), and a groove (40) complementary to the edge part (38) defined in the sealing ring (36) or, as the case may be, a receiving groove (64) in the base disk (32).

Abstract: The invention relates to a spindle motor having a fluid dynamic bearing system comprising axial and radial bearings that contains a rotor component (14) which encloses a stationary shaft (12), which in turn is connected at both its ends to axially aligned bearing parts (16; 18) that are fashioned such that they form capillary sealing gaps (32; 34), a recirculation channel (28) filled with bearing fluid that connects the remote regions of the bearing to each other, and an electromagnetic drive system (42, 44) for driving the rotor component.

Abstract: The invention relates to a spindle motor having a fluid dynamic bearing system comprising axial and radial bearings that contains a rotor component (14) which encloses a stationary shaft (12), which in turn is connected at both its ends to axially aligned bearing parts (16; 18) that are fashioned such that they form capillary sealing gaps (32; 34), a recirculation channel (28) filled with bearing fluid that connects the remote regions of the bearing to each other, and an electromagnetic drive system (42, 44) for driving the rotor component.