Abstract: An aluminum alloy, and in particular a cast aluminum alloy, for producing an engine component, in particular a piston for an internal combustion engine, consists of the following alloying elements: Silicon: 10% by weight to <13% by weight, nickel: to <0.6% by weight, copper: 1.5% by weight to <3.6% by weight, magnesium: 0.5% by weight to 1.5% by weight, iron: 0.1% by weight to 0.7% by weight, manganese: 0.1 to 0.4% by weight, zirconium: >0.1 to <0.3% by weight, vanadium: >0.08 to <0.2% by weight, titanium: 0.05 to <0.2% by weight, phosphorus: 0.0025 to 0.008% by weight, and as balance aluminum and unavoidable impurities.

Abstract: The invention relates to a multiflow liquid ring pump, comprising a rotor housing that encompasses the pump rotor. A side shield is arranged on both front ends. Each side shield has an inlet and an outlet on the side facing the other side shield, the inlet and outlet being interconnected. An admission hole for the feed line and a pressure hole for the discharge line are provided. Each side shield has at least one additional connection hole. The invention is characterized in that the outer jacket surface of each side shield (3, 4) flushes with and closes the outer jacket surface of the rotor housing (2) and in that the inlet (7, 9), the outlet (8, 10) and the connection hole (11, 12, 13, 14) are connected by channels (15, 16, 30, 31) arranged in the rotor housing (2).

Abstract: A method of testing a large number of products in which every product to be tested is subjected to at least one test mode that is carried out in a test sequence successively on all products by means of a test operation comprising several successively performed measurement operations, where statistical information on the test operation of products already tested is allowed for and where a test result is allocated for every product tested. In every test mode the order of the measurement operations of a test operation is specified such that the measurement operations are arranged in accordance with their fault frequency per measurement time and the functional dependencies between the measurement operations. Every test operation within the test sequence of a test mode is allocated a measurement mode which has a certain quantity of measurement operations to be performed and which is specified in accordance with the quantity and the products already tested in a test sequence.

Abstract: The invention relates to a process for fault detection on structures on surfaces of electrical components or the auxiliary means required to manufacture these components, wherein the actual structure provided in each respective case is scanned with a test beam. In accordance with the invention, provision is made for structure faults or structure deviations to be directly ascertained from sequences of picture points within the scope of an ordinate scanning.

Abstract: A blank for forming a spherical filling body for material-exchange columns is formed by stamping from a strip sheet of metal series of tongue-like elements extending from a middle strip. The spherical body can be formed by bending the tongue-like elements into a curved form, then bending the middle strip to form a ring. The tongue-like elements provide a plurality of drip edges to facilitate the interaction of the liquid and the gas in the material exchange column. Additional elements can be formed with the tongue-like elements to provide additional drip edges when the filling body is assembled.

Abstract: A thermal change-over switch has a switch arm movable between first and second contact positions with an intervening dead center position, a temperature responsive bimetal element is connected to the switch arm through a prestressed resilient element so as to effect quick switch-over of the arm from either position to the other while maintaining contact pressure up to the time of switch-over.