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The present invention provides a reinforced core material for a fan blade, comprising a core material and reinforcements distributed inside the core material. The reinforcements comprise one or more first reinforcements and one or more second reinforcements that are spaced apart from each other and alternately distributed, wherein the first reinforcement and the second reinforcement extend transversely to the length direction of the reinforced core material, the tensile modulus and tensile strength of the first reinforcement are greater than the tensile modulus and tensile strength of the second reinforcement respectively, the first reinforcement is formed via resin infiltration on one or more fibers of the same or different shapes, and the second reinforcement is a synthetic high polymer.

This invention provides a pixel structure and its operating method for a radiation-hardened 4T CMOS image sensor. The pixel structure includes a transmission transistor, a reset transistor, a source follower, a row select transistor, an STI bias gate, a photodiode, a floating node, a shallow trench isolation region, and a P-type substrate. The photodiode is surrounded by a P-type substrate, which is enclosed by the shallow trench isolation region. A portion of the shallow trench isolation region is covered by an STI bias gate. The lower right corner of the photodiode is connected to one side of the transmission transistor, and the other side of the transmission transistor is connected to the floating node. The reset transistor, row select transistor, and source follower are sequentially connected after the floating node. The negative bias V of the STIX designed in this invention... STI negative bias V with TX TX The shutdown voltage effectively improves the radiation resistance of the device by suppressing the generation of interface state trap charges at the STI-pixel interface and the generation of dark current in the TX-PD overlap region under the TID effect.

This invention discloses a UAV path planning method based on multi-resolution hierarchical airspace, comprising: dividing the task airspace into non-overlapping grids of different resolutions according to altitude or environmental complexity; mapping obstacle information and labeling grid attributes; abstracting free grids into nodes and constructing a graph structure of intra-layer and inter-layer connecting edges; wherein, in each inter-layer connecting edge, the parent node of the free node in the high-resolution layer and the free node in the low-resolution layer satisfy the condition for establishing an intra-layer connecting edge; searching for the optimal discrete path from the starting point to the ending point using the A* algorithm based on the graph structure; performing curve fitting and smoothing on the path point sequence, and combining UAV dynamics constraint optimization to generate a continuous and flyable 3D trajectory. This invention adapts to different airspace complexities through hierarchical grids, ensuring planning accuracy in complex areas while improving planning efficiency in large-scale airspaces, and the final trajectory balances optimality and practical flight feasibility.