Abstract: Embodiments of the present disclosure provide a method and system for generating a fertilizer formula, the method is executed by a processor, comprising: obtaining a basic formula for fertilization; obtaining monitoring data based on a monitoring device; determining a soil feature of a predetermined point based on the monitoring data; determining an experiment scheme and experimental parameters based on the soil feature and an experimental design; determining a fertilization dosage and conducting an intelligent planting experiment based on the fertilization dosage and the basic formula for fertilization; obtaining experimental parameters and experimental yield data of each experimental processing, and optimized yield data of an optimized fertilization processing, and storing the experimental parameters, experimental yield data, and the optimized yield data in a storage unit; and determining a model for reduced fertilization of nitrogen, phosphorus, and potassium nutrients and generating the fertilizer formula

Abstract: A road paver includes: a head; a body including a front end and a tail end; a feeding device, disposed in the front end to convey polyurethane concrete, and the feeding device including a stirring device; a stone paving device, disposed on the tail end to spread crushed stone over a road, and the stone paving device including a stone feed bin carrying the crushed stone; and a concrete paving device, disposed between the feeding device and the stone paving device and connected to the stirring device, and used to spread the polyurethane concrete across the road.

Abstract: A circuit for improving the switching speed of a power electronic switching chip and application thereof are provided. The design method of improving the switching speed of the power electronic switching chip is to switch its state in the saturated conductive state to the simulated saturated-high-on-voltage state which is much higher than the traditional low-saturated-on-voltage state. In this way, the carrier density in the base region and the trailing time constant are greatly reduced and the total power consumption of trailing in the cut-off period can be greatly reduced, and the design limit of switching speed can be improved and the service reliability can be achieved. Therefrom, a design method for power supply of high frequency power electronic transformer (converter) is further disclosed.