Abstract: The invention concerns a rotor combining the advantages of a single-piece wheel, which, when it is operating, only exhibits a slight and constant variation in shape (expansion shift) in the guiding region of its path, with those of a rimmed rotor with spokes, enabling, by virtue of its light weight, the bearings to be easily arranged. Further, because of its tendency to exhibit a tensile stress higher than a bending load, the rotor provides for a wide selection of rotor materials. The rotor has at least one segment arranged on the hub, enclosing at least a closed recess. A preferred embodiment concerns a rotor comprising at least three rotor segments uniformly distributed, said segments having each two recesses, such that the regions of materials surrounding them are in the form of three spokes arranged substantially parallel. The inventive rotor is particularly suitable for receiving graphite crystals, in the form or a vibrating disc for a back-scattering spectrometer.

Abstract: A process for producing an encapsulated detector operating in an ultra high vacuum (UHV) for gamma (.gamma.) spectroscopy, wherein a detector is placed into a detector chamber portion of a detector containment pot and a lid is placed into the containment pot and both are joined by electron beam welding under vacuum at their top in such a way, that the detector is not exposed to excessive heat and that the vapors generated during welding are condensed before they can reach the detector chamber, whereby a detector capsule capable of maintaining an ultra high vacuum can be produced.

Abstract: In a capsule for a detector operating in an ultra high vacuum suitable as a gamma radiation spectrometer, there is provided a detector chamber in which the detector is mounted and a getter chamber in which a getter element is mounted and the getter chamber is separated from the detector chamber by a thermal protection structure to prevent heating of the detector when the getter element is heated for conditioning. The getter element serves to maintain an ultra high vacuum in the detector chamber over a long period of operation.

Abstract: A process and an arrangement for the formation of an ignitable mixture from iquid fuel and combustion air, wherein preheated combustion air is conducted with a flow chamber along a surface which is moistened with fuel for take-up of fuel. In the process and arrangement, combustion air is conveyed into the flow chamber in the flow direction of the fuel which streams off the surface moistened by the fuel under the effect of gravity. Achieved hereby is an intensive contacting between the combustion air and the fuel. The fuel is dosed in excess so as to constantly afford a sufficient quantity of fuel for vaporization. During the through flow of the combustion air, there is formed, in the contact with the fuel, a saturated fuel-air mixture in conformance with the temperature of the preheated combustion air and the temperature of the fuel.