9results about How to "Avoid restrictive" patented technology

The invention relates to the technical field of turbojet engines, and in particular to an impeller optimization method for a micro-sized turbojet engine based on a BP neural network. The method comprises the following steps: S1, constructing a sample library, wherein the sample library comprises a training sample library and a test sample library; S2, using the training sample library to train an initial BP network model, and using the test sample library to verify the trained initial BP network model, wherein an initial weight and an initial threshold are provided in the initial BP network model; S3, using a PSO-GA phase coupling algorithm to optimize the weight and threshold in the initial BP network model; S4, updating the BP network model to obtain a final BP network model; S5, inputting an optimization target into the final BP network model, outputting variables to be optimized, and completing the structural design of the impeller according to the variables to be optimized, thereby realizing efficient, accurate and low-complexity impeller optimization design.

The application discloses a Pincer ligand rare earth metal catalyst and a preparation method thereof, and application of the Pincer ligand rare earth metal catalyst in preparation of primary amine borane compounds and secondary amine compounds. The Pincer ligand rare earth metal catalyst can be bonded with a nitrogen atom in a borane ammonia complex, thereby activating a B-H bond, so that the preparation of the primary amine borane compounds and the secondary amine compounds can be completed by using the borane ammonia complex. Compared with pinacol borane (HBpin), the borane ammonia complex (H3NBH3) has the characteristics of high stability, small toxicity and convenient storage as a boron source, and can reduce energy consumption and be environment-friendly in the reaction. In addition, the Pincer ligand rare earth metal catalyst has the advantages of simple source, small dosage and low preparation difficulty.

The cutter comprises a blade and a handle, the handle is connected to the blade, and the handle comprises a holding part; in the direction that the end, connected with the blade, of the handle points to the end, away from the blade, of the handle, the height H of the holding part in the vertical direction is increased firstly and then decreased, and the thickness W of the holding part in the transverse direction is gradually increased. According to the cutter, the contour shape of the front handle section is similar to the contour shape formed by holding the side, close to the thumb, of the palm in a conventional holding posture, so that the holding comfort is improved, after the hand is held and formed in the front handle section, if the hand tends to slide backwards, the rear handle section can play a role in limiting, and therefore the cutter is prevented from being damaged. And the hand is effectively prevented from sliding backwards, so that the risk that the cutter slips out of the hand is reduced, and the use safety is improved.

The utility model relates to the technical field of sprinkling irrigation devices, and discloses a novel sprinkling irrigation device capable of efficiently utilizing water resources, which comprises a counterweight bottom plate, the top of the counterweight bottom plate is fixedly connected with a concave plate, and a rotating shaft is rotatably connected between the front surface and the back surface of an inner cavity of the concave plate through a bearing; and the outer surface of the rotating shaft is fixedly connected with a first gear. Through the arrangement of the counterweight bottom plate, the concave plate, the rotating shaft, the first gear, the adjusting box, the screw rod, the tooth plate and the movable plate, the spraying height and the spraying position of the water spraying head can be adjusted, through the arrangement of the concave frame, the rotating column, the driving box, the rotating rod, the water storage box, the water spraying head and the driving assembly, the water storage box can drive the water spraying head to rotate, and the water spraying head is driven to rotate. By arranging the structure, the spraying height and the spraying position of the water spraying head can be conveniently adjusted, limitation of spraying irrigation is effectively avoided, and therefore the use requirements of customers can be met.

The present application belongs to the field of biology and chemistry, and relates to a method for visual detection of porcine pseudorabies virus (PRV) by using a CRISPR / Cas12a system. ‑ / TK ‑ The present application discloses a crRNA for differentiating a CRISPR / Cas12a-based visual porcine pseudorabies wild strain and gE ‑ / TK ‑ gene deletion vaccine strain, and corresponding primers and probes. The differential diagnosis method of the present application comprises the following steps: step one, extraction of a virus genome; step two, amplification of the extracted virus genome by using a constant temperature amplification primer through a constant temperature amplification technology; and step three, use of the amplified product for Cas12a detection. The method of the present application is simple to operate and has superior sensitivity and specificity.

This application relates to a management method for a power battery pack, belonging to the field of vehicle manufacturing technology. The method includes: for each cell in the power battery pack to be tested, performing AC internal resistance deviation diagnosis, capacity decay diagnosis, and voltage change rate trajectory anomaly diagnosis on the cell, obtaining the cell's AC internal resistance value, internal resistance anomaly judgment value, cell capacity estimate, capacity anomaly judgment value, and voltage cumulative anomaly judgment value, respectively. Based on the internal resistance anomaly judgment value, capacity anomaly judgment value, and voltage cumulative anomaly judgment value, the cell is determined to be faulty; the number and location of faulty cells are counted; if the number of faulty cells is less than or equal to a preset maximum allowable short-circuit number, the faulty cells are short-circuited based on their location, and the system parameters of the short-circuited power battery pack are reconstructed; if the number of faulty cells is greater than the maximum allowable short-circuit number, the power battery pack to be tested is replaced. Using this application can improve the accuracy of faulty cell identification.

The invention relates to the technical field of turbojet engines, in particular to a BP neural network-based impeller optimization method for a microminiature turbojet engine. Comprising the following steps: S1, constructing a sample library which comprises a training sample library and a test sample library; s2, training an initial BP network model by using a training sample library, verifying the trained initial BP network model by using a test sample library, and setting an initial weight and an initial threshold in the initial BP network model; s3, optimizing a weight and a threshold value in the initial BP network model by using a PSO-GA (Particle Swarm Optimization-Genetic Algorithm) phase coupling algorithm; s4, updating the BP network model to obtain a final BP network model; and S5, inputting an optimization target into the final BP network model, outputting a to-be-optimized variable, and completing the structural design of the impeller according to the to-be-optimized variable. Efficient, accurate and low-complexity impeller optimization design is realized.

The invention discloses a high-airtightness LED lamp bead structure and a preparation method thereof.The LED lamp bead structure comprises a light-emitting chip and a lamp bead support used for fixedly installing the light-emitting chip, a metal pin comprises a connecting section and a welding section, the connecting section is continuously bent downwards twice from a metal substrate and then connected with the welding section, and the welding section is connected with the light-emitting chip. The connecting section comprises a first connecting section, a second connecting section and a third connecting section which are sequentially connected between the metal substrate and the welding section; the metal substrate is located in the inner cavity of the reflection cup, and the lower surface of the metal substrate is not lower than the bottom surface of the reflection cup, so that at least part of the first connection section is located in the inner cavity of the reflection cup; and the ratio of the vertical height of the first connecting section to the cup depth of the reflecting cup is (1.05-1.34): 1. By implementing the LED lamp bead, the brightness and the air tightness of the lamp bead can be improved, the use of packaging glue is reduced, the cost is reduced, meanwhile, the difficulty of the manufacturing process of the LED lamp bead is reduced, and the quality of the LED lamp bead is improved.