3results about How to "Sparsely distributed" patented technology

The invention provides a composite negative pole piece, a battery and electric equipment. The composite negative pole piece comprises a current collector, the current collector is provided with a plurality of active material containing holes, openings of the active material containing holes are formed in the surface of the current collector, and the bottoms of the active material containing holes are located in the current collector; an active material in the first active layer comprises a silicon active material, the silicon active material is in a nanosheet shape, the first active layer is arranged on the surface of the current collector in a contact mode, and at least part of the silicon active material is located in the active material containing hole; and the second active layer comprises graphite, the second active layer is arranged on one side, far away from the current collector, of the first active layer, and the second active layer integrally covers the first active layer. The structural design is beneficial to reducing the dependent variable of the whole composite negative pole piece in the charging and discharging process, so that the problems of pulverization and falling of the silicon active material are obviously improved, and the composite negative pole piece has obviously higher cycling stability.

The utility model provides an aorta covered stent for implementing in-situ fenestration in an intracavitary repair process, which comprises a stent and a covering membrane, the stent comprises a plurality of wave rings, the plurality of wave rings are arranged at intervals along the length direction of the stent, and the covering membrane is arranged at intervals along the length direction of the stent. The device is divided into a bare section, a reinforcing section, a membrane rupturing section and a supporting section from the near end to the far end, and the density of the membrane rupturing section, the density of the supporting section and the density of the reinforcing section are gradually increased. The membrane comprises a membrane body and a marker which are connected, the membrane body wraps the reinforcing section, the membrane breaking section and the supporting section in the circumferential direction of the stent, the marker is arranged between the membrane breaking section and the reinforcing section, the marker is arranged between the membrane breaking section and the supporting section, the membrane is easy to break, in-situ windowing is achieved, and meanwhile after the membrane is broken, the other parts are stable in structure.

This invention discloses an MRI passive shimming optimization method based on the PSA-SQP hybrid algorithm, comprising the following steps: (1) Magnetic field mapping to evaluate the uniformity of the magnetic field: the magnetic field non-uniformity at a specific sampling location within the imaging area is evaluated using a magnetic field probe / camera; (2) Establishing an optimization model for passive shimming; (3) Hybrid algorithm optimization of passive shimming: combining the pattern search algorithm PSA with sequential quadratic programming SQP to find the optimal solution for the iron block in the passive shimming system. PSA is run in advance to perform a global search, obtaining elite individuals as initial values ​​for SQP optimization, and then the optimal solution for the iron block in the passive shimming system is found by running SQP. This algorithm can achieve high magnetic field uniformity and also has limitations on the weight of the shimming iron sheet. Importantly, it can achieve a sparse distribution of the shimming iron sheet.