12results about How to "The method is simple and reliable" patented technology

The application discloses a positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing iron phosphate, a carbon source, a sodium source and water to prepare a slurry; the mixed iron phosphate contains phosphate and pyrophosphate or phosphate and dihydrogen phosphate; the carbon source contains citric acid; the prepared slurry is grinded to obtain a fine slurry; the fine slurry is sprayed and dried to obtain a solid precursor; and the solid precursor is sintered to obtain the positive electrode material. By controlling the reaction parameters, the mixed iron phosphate containing pyrophosphate or dihydrogen phosphate is synthesized, the amount of citric acid in the subsequent process is reduced, the pore generation rate is reduced, the material compaction density is improved, the method is simple and reliable, and the application prospect is good. The prepared positive electrode material has high specific capacity and high compaction density, and is suitable for preparing a positive electrode of a sodium ion battery.

The invention is suitable for the technical field of automobile aerodynamics, and provides a self-adaptive flexible spoiler experimental development method under a yaw working condition, and the method comprises the steps: arranging and driving a flexible spoiler in a wind tunnel; the parameters of the spoiler are optimized with the wind resistance coefficient as the target at the multiple yaw angles; designing a piecewise linear rule controller based on an optimization result; pressure monitoring points are arranged on the two sides of a vehicle body, the regression relation between the pressure difference and the yaw angle is established, and the yaw angle is recognized in real time; developing a self-adaptive resistance reduction optimization program, driving the spoiler to be adjusted to the optimal form in real time according to the identified yaw angle, and verifying the resistance reduction effect of the spoiler; a mathematical method is used for calculating the curved surface shape of the spoiler, and reference is provided for automobile appearance design. Aerodynamic configuration self-adaptive adjustment of the vehicle under the crosswind working condition can be achieved, the wind resistance optimization capacity of the real vehicle in the running process is remarkably improved, and an effective experimental method and design basis are provided for low-wind-resistance development of the vehicle.

The invention discloses an optimal control method for improving the power tracking precision of a hybrid synchronous converter, and belongs to the field of power electronic technology and power system control. The invention provides an improved control strategy based on a series high-pass filter in order to solve the problem of low active power tracking precision caused by steady-state coupling of a voltage synchronization loop in existing hybrid synchronization control. According to the invention, the high-pass filter is connected in series in the voltage synchronization loop, continuous interference of a steady-state power angle to the frequency is blocked by utilizing the direct current blocking and alternating current alternating current characteristics of the high-pass filter, and the power synchronization loop independently dominates the steady-state frequency, so that the steady-state power error is thoroughly eliminated, and zero-static-error tracking is realized. And meanwhile, the response capability of the voltage synchronization loop to transient high-frequency disturbance is reserved, so that the excellent transient damping characteristic of the hybrid synchronization control strategy still exists. In addition, the method is simple in structure, does not need to depend on complex system parameter identification, and has high robustness and engineering adaptability.

This invention relates to a method for refining and classifying coking coal based on petrographic and matrix strength, comprising: determining the petrographic composition of the coking coal; placing the prepared sample in a dry distillation reactor for dry distillation reaction; pulverizing; taking a sample with a weight of M0 and placing it in a type I rotary drum for a rotational experiment, then sieving and recording the weight of coke particles larger than 0.2 mm as M1; calculating the matrix strength I. cb = (M1 / M0)*100%; based on the vitrinite content V and matrix strength I in the coal and petrographic composition. cb This invention enables the detailed classification of coking coal. It can quickly distinguish between coking coal types with similar conventional coal quality indicators and further classify them, providing a reliable basis for coking coal quality evaluation and blending guidance. The method is simple, reliable, low-cost, and timely, making it suitable for coal and coking enterprises and possessing broad application value.

This invention provides an automated monitoring method for vegetation change in open-pit mining areas based on long-term time-series remote sensing data, belonging to the field of remote sensing and geographic information technology. The method includes the following steps: S1. Data acquisition and preprocessing: Acquire all data from the mining area during the study period, and obtain NDVI time-series data through cropping, NDVI calculation, maximum value synthesis, and filtering; S2. Template creation: Based on statistical analysis of the filtered NDVI time-series data, obtain the NDVI values ​​of vegetation and bare soil in the mining area, and generate NDVI templates for different vegetation change trajectory types by combining typical vegetation change patterns in open-pit mining areas; S3. Vegetation change trajectory type classification: Using the NDVI templates as training data, obtain the vegetation change trajectory type for each pixel in the mining area using a DTW-based KNN classification method; This invention can achieve a highly automated monitoring method for vegetation change in open-pit mining areas without sample training or parameter setting.

The invention discloses a storage and calculation integrated signal processing method and system for infrared target detection, and relates to the technical field of low-power-consumption end side intelligent target detection. Comprising the steps that S1, a main control FPGA receives real-time infrared image signals of an upper computer, infrared image preprocessing is conducted through an algorithm model, and a preprocessing result is output to a storage and calculation integrated processing carrier plate; s2, based on the preprocessing result, performing convolution operation by a storage and calculation integrated processing carrier plate to obtain a convolution calculation result; and S3, the master control FPGA summarizes the preprocessing result and the convolution calculation result and feeds back the result to the upper computer. The technical problem that a traditional computing architecture encounters high energy consumption when executing an intelligent algorithm is solved.

This invention relates to a method for calculating the input and output power of a permanent magnet wind turbine after demagnetization, and pertains to the field of permanent magnet wind turbine control technology. The method includes: obtaining the first and second average electromagnetic torques of the permanent magnet wind turbine under rated current, both before and after short-circuit demagnetization, and calculating torque loss; dividing the wind speed range of the generator's operation after short-circuit demagnetization into a first wind speed range and a second wind speed range based on the torque loss; calculating the input and output power of the generator in the first and second wind speed ranges based on the torque loss; concatenating the obtained input and output power to obtain the input and output power curves of the generator across the entire wind speed range after short-circuit demagnetization; and controlling the permanent magnet wind turbine based on the input and output power curves. This invention solves the problem of maximizing the output power of a permanent magnet wind turbine while ensuring reliability, thereby ensuring maximum power generation.

A bridgeless Cuk power factor correction topology circuit and its control strategy are disclosed. The circuit includes an AC voltage source, a filter energy storage module, a bridgeless rectifier module, a power frequency ripple coupling module, a buck filter module, and an equivalent load RL. This circuit uses transistors instead of traditional rectifier bridge diodes, reducing the number of components and solving the problem of high conduction losses in traditional diodes. It also offers advantages such as reduced power consumption and high reliability, improving the efficiency of the Cuk PFC converter. Furthermore, based on the bridgeless Cuk power factor correction topology circuit, this invention proposes a simple and easy-to-implement dead-time control strategy and a zero-crossing control strategy, ensuring the integrity of the inductor freewheeling path. Compared to traditional totem-pole bridgeless PFC converters, it has lower requirements for controller performance and better robustness.

The application relates to a kind of calculation methods of turbine admission end regulating linearity, the difference of the termination value and initial value of the comprehensive valve position instruction in nearly 5min is calculated, the linearity k basic value of the comprehensive valve position interval to which it belongs is obtained according to the comprehensive valve position instruction value at termination and initial k , how to use linearity to evaluate the overall operation characteristics of high regulating valve is given, and abnormality is found in time to guide operation personnel to handle. The method is simple and reliable, high accuracy, strong practicability, which can be used in online monitoring system of thermal power plant and other digital systems, continuously monitors linearity, reduces the monitoring pressure of operation personnel, and improves work efficiency.

The invention discloses a PDA lining confined nano Ti carbon nanotube composite photocatalyst as well as a preparation method and application of the PDA lining confined nano Ti carbon nanotube composite photocatalyst. The carbon nanotube composite photocatalyst comprises uncapped multi-walled carbon nanotubes (MWCNTs) acidized by concentrated nitric acid, an inner cavity of each MWCNTs forms a through channel, and the inner wall of each MWCNTs is covered with an organic lining layer formed by thermocuring of PDA; ti nanoparticles are confined and dispersed between the organic lining layer and the inner wall of the uncapped multi-walled carbon nanotubes (MWCNTs), and are connected with the carbon skeleton through Ti-O-C bonds to obtain the PDA (at) CNTs (at) Ti composite photocatalyst. In practical application, the catalyst shows relatively strong anti-interference capability, can stably operate in a complex water body, and has relatively good reusability and catalytic stability. The method disclosed by the invention has the advantages of simple process, easily available raw materials, high catalytic activity and the like, and particularly has a wide application prospect in the aspects of water treatment and pollutant degradation.

This invention discloses a method for verifying the strength of a deck beam. The method involves: determining the working condition under which the beam experiences the target maximum bending moment based on the vehicle spacing 'a' and the span length 'l' of the deck beam, i.e., determining the number of wheel loads and the position of each wheel; calculating the target maximum bending moment by substituting the parameter 's' characterizing the wheel position into the corresponding formula; comparing the calculated target maximum bending moment with the beam's ultimate bending moment; if the calculated target maximum bending moment is less than the beam's ultimate bending moment, the beam strength meets the design requirements; if the calculated target maximum bending moment is greater than or equal to the beam's ultimate bending moment, the beam strength does not meet the design requirements. The beneficial effects of this invention are: it provides a method for verifying the strength of a deck beam, provides corresponding calculation formulas, and provides a method for determining wheel load working conditions.

The utility model discloses a kind of oil collecting plates, including oil collecting plate body, still including the two-axis reverse gear oil guide groove of installing in the bottom of oil collecting plate body one side and the two-axis gear oil guide groove of installing in the bottom of oil collecting plate body other side;The two-axis reverse gear oil guide groove is arranged by the edge of oil collecting plate body to center inclination, the two-axis gear oil guide groove is arranged by the edge of oil collecting plate body to center inclination.The oil collecting plate provided by the utility model, by setting two-axis reverse gear oil guide groove and two-axis gear oil guide groove collection two-axis reverse gear and two-axis gear oil splashing of oil liquid and the oil liquid collected is transported to bearing, so that roller bearing is fully lubricated, greatly reduce the failure rate of this bearing.The oil collecting plate provided by the utility model, integrally stamping molding, improve the strength and accuracy of component whole, shorten technological process, significantly improve the efficiency of manufacturing and processing, reduce manufacturing cost.