4results about How to "Method flow is clear" patented technology

The invention discloses a soil body heat flux profile determination method based on an AH-DTS technology, and the method comprises the steps: determining a reference depth at which the soil body temperature is stable along with time through measuring the soil body temperature at different depths and different moments and the corresponding volume water content; calculating the volume heat capacity of the soil body, layering the soil body above the reference depth, and obtaining the average temperature and heat capacity of each layer; and calculating the single-layer heat storage amount and accumulating to obtain the total heat storage amount, and finally obtaining the heat flux profile of the soil body at any target depth. The method comprises the steps of reference depth determination, soil volume heat capacity calculation, soil layer equal division and layered heat storage capacity calculation, heat storage capacity accumulation and heat flux profile solving. The method is easy and convenient to operate and high in spatial resolution, the influence of soil moisture content change on the heat flux can be effectively represented, in-situ continuous measurement of the soil heat flux profile can be achieved, and a reliable technical means is provided for research on the soil moisture and heat transfer law.

This invention discloses a rapid beamforming method for large antenna arrays based on partitioned calibration and proximity coupling, belonging to the field of antenna design and electromagnetic simulation technology. It aims to obtain the actual realized gain pattern of large mutually coupled arrays at low cost and high speed. This invention models the array in differentiated regions: precise simulation of local coupling is performed on edge elements, while data reuse is achieved for central region elements using a pre-calibrated equivalent model. After acquiring the electric field data of each element, a global optimization algorithm based on the mutually coupled environment is used to directly solve for the element excitation distribution that optimizes beam pointing performance, and the actual realized gain pattern conforming to the actual port matching state is quickly synthesized. Simulation results show that, while maintaining accuracy similar to full-wave simulation, this invention only requires simulating a small number of key elements to efficiently synthesize the radiation pattern of a large-scale array, significantly improving design efficiency.

The application discloses a kind of based on difficulty perception's collaborative knowledge tracking method, belong to knowledge tracking technical field.The application includes: obtaining the difficulty parameter of each question in student historical answer data, and the difficulty parameter is standardized processing;Based on the historical answer of student and difficulty information, construct difficulty perception behavior characteristics;Calculate the similarity between target student and other students, and filter out the student similar to target student in difficulty perception behavior characteristics;According to the answer data of the similar student and the difficulty information of the target question, collaborative information screening is carried out;Based on the screened collaborative information, the learning state of target student is predicted.The method flow of the application is clear, easy to implement, can be directly deployed in existing online learning system, improves the overall performance of knowledge state prediction under the premise of not increasing additional hardware cost.

This invention discloses a method for identifying mutual inductance and mutual capacitance parameters in a hybrid-coupled wireless power transfer system, applicable to wireless power transfer systems where inductive and capacitive coupling coexist. Under the condition of a fixed system operating frequency, this method acquires time-domain signals such as primary-side voltage, primary-side current, and primary-side coil terminal voltage. A steady-state interval is selected, and the fundamental phasor is extracted using the synchronous integration method. Combined with known parameters such as compensation capacitor, coil self-inductance, and parasitic resistance of the compensation capacitor and coil, a system of complex equations including mutual inductance and mutual capacitance is established and solved to obtain the target parameters. Compared with existing methods that require changing the frequency or adding additional measurement circuits, this invention only requires a small number of voltage and current measurements to complete the identification of mutual inductance and mutual capacitance. The steps are simple, the implementation cost is low, and effective identification can still be achieved through the fundamental phasor even in the presence of inverter / rectifier nonlinear excitation.