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This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

The invention relates to a shale gas well long-term productivity prediction method, device and equipment, and the method comprises the steps: carrying out fracturing simulation on an uncommissioned well according to target fracturing construction pump injection parameters and stratum parameters of a stratum where the uncommissioned well is located, and obtaining fracture parameters of the uncommissioned well; calculating shale gas reservoir reserves of the non-commissioning wells according to the well parameters of the non-commissioning wells and the fracture parameters; according to the long-term productivity actual values of the multiple put-into-production wells in the stratum, the single-well production rate of each put-into-production well is calculated, single-well production rate posterior distribution is constructed, and a target single-well production rate value is determined based on a Markov chain-Monte Carlo sampling method; and according to the shale gas reservoir reserves of the non-commissioning well and the target single well production rate value, the long-term productivity predicted value of the non-commissioning well is calculated, so that a worker develops the non-commissioning well according to the long-term productivity predicted value, stratum resources are fully developed, and the overall efficiency of shale gas development is improved.

This invention provides the application of *Bifidobacterium animalis* subsp. lactis CP-9 in the preparation of compositions that promote neurodevelopment and alleviate cognitive impairment and nerve damage. This invention discovers that *Bifidobacterium animalis* subsp. lactis CP-9 can improve abnormal neurodevelopment, cognitive impairment, and nerve damage, and has a protective effect on the nervous system and overall health. This novel application expands the application scope of *Bifidobacterium animalis* subsp. lactis as a probiotic, and is of great significance for further exploring the functions of probiotics and developing probiotics with higher nutritional and health benefits. It also opens up new avenues and solutions for protecting nervous system health and preventing nervous system diseases through dietary strategies.