Abstract: A concentrator for focusing solar radiation onto an elongate absorber, comprising a plurality of transverse supports arranged one behind the other in the longitudinal direction, stabilizing the concentrator in the transverse direction and defining the shape of the concentrator profile, and a thin-walled support structure resting on said transverse supports and having a plurality of adjacent longitudinally extending ribs stabilizing the concentrator in the longitudinal direction. In the transverse direction, the support structure adapts to the curved profile of the transverse supports and forms a light-weight and strong bearing for a reflector plate.

Abstract: A solar receiver (1) for a solar-thermal power plant, comprising a receiver surface (2) facing towards the concentrated incident solar radiation (8) and including a plurality of mutually spaced absorber bodies (3), is provided with gas channels arranged between the absorber bodies (3) for supplying a gas or gaseous mixture (11) adapted to absorb solar radiation (8) to a region located in front of the receiver surface (2). In this region, the gas (11) will absorb a part of the incident solar radiation (8) and then will be sucked together with the ambient air (9) through the absorber bodies (3) to be further heated therein.

Abstract: A shutter (1; 10) for regulating the fluid flow in an absorber pipe (D) of a solar-thermal power plant comprises a shutter body (2) with a central shutter opening (3) for the fluid (F) and a movable throttle element (4; 12) at least partly closing the shutter opening (3; 11). The throttle element (4) is connected to a motion element (6) that is in thermal contact with the fluid (F) and changes its shape as a function of the fluid temperature so that in case of an increased temperature of the fluid (F), the opening cross section of the shutter opening (3; 11) is enlarged, whereby the mass flow of the fluid (F) increases and the temperature thereof drops.

Abstract: The invention relates to an absorber designed to absorb radiation and to transfer the energy of the radiation to a heat transport medium. To provide an absorber with high efficiency, the absorber according to the invention comprises a plurality of absorber components (32) attached to each other and having passages (42) formed therein for absorption of radiation and for suctional intake of a heat transport medium. Each absorber component (32) is provided with a dedicated mixing chamber (44) having said passages (42) of said absorber component (32) entering thereinto and comprising flow-restricting outlet orifices for connection to a suction means.

Abstract: The invention relates to an electromagnetically operated leaf shutter particularly for use in photographic cameras installed in microscopes in which a rotatable annular armature including a light passage is provided with an even number of poles radially extending to an annular field ring being secured into a tubular shutter housing. The annular field ring is provided with an even number of pole-shoes extending towards the armature poles. The armature and the field ring are made of "soft magnetic" material. The geometry of the pole-shoes and the adjacent respective poles is so that an optimum of magnetic force is exerted upon the armature when the electromagnetic coils which surround the pole-shoes are energized, and, hence, a rotation of the armature is effected. The armature is provided with means to operate the blades of the shutter in order to open the light passage.