Abstract: The invention relates to a computer system, comprising a chassis, a system board, which is arranged in the chassis, and a first power supply unit, which is directly connected to the system board via at least one first plug connector. Furthermore, the computer system comprises an expansion board, which is arranged in the chassis and connected to the system board via at least one second plug connector. Furthermore, the computer system comprises a second power supply unit, which is directly connected to the expansion board via at least one third plug connector, and a circuit, which is arranged on the system board, wherein the circuit is connected to the at least one first plug connector and the at least one second plug connector and is configured to enable a power supply of the computer system selectively by the first power supply unit and/or the second power supply unit.

Abstract: The invention relates to a computer system, comprising a chassis, a system board, which is arranged in the chassis, and a first power supply unit, which is directly connected to the system board via at least one first plug connector. Furthermore, the computer system comprises an expansion board, which is arranged in the chassis and connected to the system board via at least one second plug connector. Furthermore, the computer system comprises a second power supply unit, which is directly connected to the expansion board via at least one third plug connector, and a circuit, which is arranged on the system board, wherein the circuit is connected to the at least one first plug connector and the at least one second plug connector and is configured to enable a power supply of the computer system selectively by the first power supply unit and/or the second power supply unit.

Abstract: Process and device for determining para content X.sub.1 of a hydrogen gas stream, in which temperature T.sub.1 as well as pressure p.sub.1 of the hydrogen gas stream are measured before its entry into at least adiabatically-operated para-ortho-conversion catalyst. The hydrogen gas stream flows through the para-ortho-conversion catalyst until equilibrium is established. Thereafter, temperature T.sub.2 as well as pressure p.sub.2 of the hydrogen gas stream are measured after the hydrogen gas exits from the para-ortho-conversion catalyst or are measured after the last of the latter exits the catalyst. Para content X.sub.1 of the hydrogen gas stream, at the instant before entering the para-ortho-conversion catalyst, is determined by relations h.sub.1 (X.sub.1, T.sub.1, p.sub.1)=h.sub.2 (X.sub.2, T.sub.2, p.sub.2) and X.sub.2 =X.sub.g (T.sub.2) in equilibrium, in which h.sub.1 is the enthalpy of the hydrogen gas stream at the inlet of the para-ortho-conversion catalyst and h.sub.