Abstract: A filling member for use with installations where media are in direct contact for energy and/or mass exchange, or for chemical or biological reactions, or for mixing and separation processes, for instance, for trickling screens or mist eliminators in cooling towers, for direct heat exchangers, for drippers in biological waste water clarification plants, for chemical towers for liquid and/or gas distributors and mixers, for air feeders or the like is disclosed. The filling member comprises generally panel-like foils with waves or undulations including wave crests and wave troughs of predetermined amplitude and wavelength set against each other along their course, and are connected with each other for formation of flow ducts. The flow ducts have at least two reorientations or redirections in flow direction.

Abstract: The invention relates to a tribological system with plastic/plastic pairings, especially sliding bearings, in which plastics--optionally supported by lubricants--carry out motions in sliding friction relative to one another and at least one of the main sliding partners and/or auxiliary partner is a plastic, containing polar, cyclic compounds, in which the cyclic part of the molecule on at least one side is coupled directly to an atom of Group V (especially nitrogen) or of Group VI (especially oxygen and/or sulfur) of the Periodic System of the elements, or in which the rings contain the atoms mentioned.