| 摘要 |
A flow means for location within an aperture (A) to regulate flow through the aperture on a path from a first location (5) on one side of the aperture to a second location (6) on the other side of the aperture wherein there is provided: a barrier (1) defined by a sequence of vertical elements; means for driving the sequence of elements, so that the barrier serves to generate a predetermined wave form along the path such that the barrier serves to create in sequence: an entry region for occupation by at least one individual which entry region is initially open towards the one side of the aperture but isolated from the other side of the aperture; a traversing region (R) on the path generated from the entry region by progressive movement of the barrier, and an exit region open towards the other side of the aperture but isolated from the one side. |
