Abstract: The present disclosure relates to the technical field of the permanent-magnetic track, and discloses a magnetic track module, a composite permanent-magnetic track and an installation method thereof. The magnetic track module comprises: at least two layers of magnetic units that are staggered in the first direction and stacked in the second direction with the same magnetization direction, wherein each magnetic unit is formed by a plurality of closely-arranged permanent magnets; and a bottom ferromagnetic plate that covers the lower surface of the bottom magnetic unit, with an attractive magnetic force existing between the bottom ferromagnetic plate and the adjacent magnetic unit.

Abstract: The present disclosure relates to the technical field of the permanent-magnetic track, and discloses a magnetic track module, a composite permanent-magnetic track and an installation method thereof. The magnetic track module comprises: at least two layers of magnetic units that are staggered in the first direction and stacked in the second direction with the same magnetization direction, wherein each magnetic unit is formed by a plurality of closely-arranged permanent magnets; and a bottom ferromagnetic plate that covers the lower surface of the bottom magnetic unit, with an attractive magnetic force existing between the bottom ferromagnetic plate and the adjacent magnetic unit.

Abstract: Disclosed in the present invention are a pyruvic acid optical probe, a preparation method therefor, and an application thereof. One aspect of the present invention is the disclosure of an optical probe, which includes a pyruvic acid-sensitive polypeptide and an optically active polypeptide, wherein the optically active polypeptide is located within the sequence of the pyruvic acid-sensitive polypeptide. The present invention also discloses a preparation method for the probe and an application of said probe in pyruvic acid measurement.