Abstract: A liquid-crystalline medium which comprises at least one compound selected from the group of compounds of the formulae IA to IH, in which Z1 denotes a single bond, —CH2CH2—, —CH?CH—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —COO—, —OCO—, —C2F4—, —(CH2)4—, —CHFCHF—, —CF2CH2—, —CH2CF2—, —C?C—, —CF?CF—, —CH?CHCHO— or —CH2CF2O—, and the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PALC, FFS, PS-FFS, SA-VA, PS-IPS or IPS effect.

Abstract: A liquid-crystalline medium which comprises at least one compound selected from the group of compounds of the formulae IA to IH, in which Z1 denotes a single bond, —CH2CH2—, —CH?CH—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —COO—, —OCO—, —C2F4—, —(CH2)4—, —CHFCHF—, —CF2CH2—, —CH2CF2—, —C?C—, —CF?CF—, —CH?CHCHO— or —CH2CF2O—, and the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PALC, FFS, PS-FFS, SA-VA, PS-IPS or IPS effect.

Abstract: A device is described for connecting an, at least in part, electrically conductive sheath (21) of an alternating current winding (4), which is placed into the grooves (2) of a long-stator (1), to a ground conductor (17). The device comprises a sleeve (11) partly enclosing the winding (4) and being provided with a connecting element (16) for said ground conductor (17). According to the invention the sleeve (11), the ground conductor (17) an the connecting element (16) are exclusively made of a non-corrosive metal (FIG. 6).

Abstract: A long-stator and a magnetic levitation railway equipped therewith are described. The long-stator comprises a plurality of stator sections (1, 1b) that are arranged one behind the other, adjoin one another at separation points (22) and have grooves (2) following each other in a longitudinal direction for receiving at least one alternating current winding (4) and at least one ground conductor (17) extending in longitudinal direction for grounding said alternating current winding (4). According to the invention the ground conductor (17) comprises, at least in the vicinity of critical separation points (22), a conductor section (25) that bridges the separation point (22) and is configured as a loop (24) (FIG. 10).