Abstract: The present invention discloses a high-strength R-T-B rare earth permanent magnet and a preparation method thereof. The magnet contains 0.3-1.5 wt. % of an element Zr, and a cast strip prepared through vacuum induction melting and melt spinning is treated at a high temperature to make the element Zr therein precipitate in a form of fibrous Zr compounds from R-rich phases, and the fibrous Zr compounds can be uniformly mixed with magnetic powder after hydrogen decrepitation and powder jet milling and mixing, and gradually grow into rod-like Zr compounds existing in the R-rich intergranular phases during the sintering of a green compact. By adjusting the content of the element Zr, sintering temperature and time and other process parameters, the morphology, size and distribution of Zr compounds can be effectively controlled, and the mechanical properties of the magnet can be improved by strengthening the R-rich intergranular phases without deteriorating the magnetic properties of the magnet.

Abstract: Disclosed is a route planning method for a navigation system. The method comprises: performing grid processing on an actual geographic space, the grids being cells in a cellular network, acquiring a mobile station cell handover record, and creating a cell adjacency model according to the mobile station cell handover record; making a source and a destination in the actual geographic space correspond to a source grid and a destination grid after the grid processing, and determining a grid-level path from the source grid to the destination grid according to the inter-grid adjacency model; and converting the grid-level path into an actual route from the source to the destination in the actual geographic space. Also disclosed is a route planning device for a navigation system.

Abstract: Disclosed is a route planning method for a navigation system. The method comprises: performing grid processing on an actual geographic space, the grids being cells in a cellular network, acquiring a mobile station cell handover record, and creating a cell adjacency model according to the mobile station cell handover record; making a source and a destination in the actual geographic space correspond to a source grid and a destination grid after the grid processing, and determining a grid-level path from the source grid to the destination grid according to the inter-grid adjacency model; and converting the grid-level path into an actual route from the source to the destination in the actual geographic space. Also disclosed is a route planning device for a navigation system.