A locking arrangement for data structures is provided that prevents deadlocks, but still allows different threads to simultaneously obtain locks on different nodes of a data structure for both read and write operations. Rotary units typically include rotational components that are configured to rotate. Then, in a period during which the data sampling is not performed, the operation of a shift register in a source driver and sampling operation of a video signal in a first latch circuit are stopped. The numerical control values A are fed by means of an operating element to the arrangement for processing video or audio signals. At least a portion of the first effluent is then contacted with a second catalyst under conditions effective to transalkylate C9+aromatic hydrocarbons with said at least one C6-C7 aromatic hydrocarbon to form a second effluent comprising xylene. The center conductor comprises a first end section with axially form confining fixing means and a second end section with means for direct connection to connecting means of a connector.