3results about How to "Make a smooth transition" patented technology

This invention relates to the field of LED technology, and particularly to a high-efficiency violet LED epitaxial structure and its growth method. The epitaxial structure, from bottom to top, includes: a patterned AlGaN template substrate and a GaN-based epitaxial layer. The patterned AlGaN template substrate sequentially includes a growth substrate, a buffer layer, an AlGaN layer, and a mask layer, wherein the mask layer is a periodically patterned mask. The GaN-based epitaxial layer sequentially includes: an AlGaN capping layer, an n-type semiconductor layer, a stress relief layer, a multi-quantum-well active region, an electron blocking layer, and a p-type semiconductor layer. The n-type semiconductor includes an Alx3Ga1-x3N layer with an Al composition of 0.01 ≤ x3 ≤ 0.05 and x3 ≥ x2. This invention effectively blocks dislocation propagation and reduces defect density through the synergistic design of the patterned AlGaN template substrate and the laterally epitaxially grown AlGaN capping layer; and achieves progressive stress relief and light absorption suppression through the gradient increase of Al composition in each layer of the all-AlGaN-based structure.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

The application discloses a reduction device for long bone comminuted fracture operation, and relates to the technical field of medical devices. The device comprises a middle segment positioning mechanism and two groups of two-side segment positioning mechanisms symmetrically arranged. The middle segment positioning mechanism comprises a positioning tube provided with a wedge-shaped convex rib; the two-side segment positioning mechanism comprises a frame body, an inner movable block capable of adjusting the position in the axial direction and an outer flexible sheet, and realizes fine adjustment of the position through a lead screw and a bevel gear transmission group. The proximal ends of the two groups of frame bodies are designed in a step-shaped overlapping mode and are jointly sleeved outside the positioning tube. Through a one-way meshing structure formed by a rack in the mounting block and the wedge-shaped convex rib, and by using matched guide inclined surfaces and limiting stop surfaces, the two groups of frame bodies are realized to slide inwardly and be automatically locked. The application realizes the logic of central anchoring and two-side butt, ensures the tightness and in-operation stability of the joint between the side bone block and the middle bone block, supports vertical sliding and separation, and greatly facilitates post-operation removal.