6results about How to "Reduce compressive stress" patented technology

The invention discloses an epitaxial structure, a preparation method thereof and a light-emitting diode, and belongs to the technical field of semiconductors. The epitaxial structure comprises a substrate, a light-emitting layer formed on the substrate, an N-type current expansion layer and a P-type current expansion layer which are formed on the two sides of the light-emitting layer, and an electron blocking layer formed between the light-emitting layer and the P-type current expansion layer. Wherein the light-emitting layer comprises at least one pair of quantum well layer In < x > Ga < 1-x > N and quantum barrier layer In < y > Ga < 1-y > N, and y < lt > is greater than or equal to 0; x < 1. The material components of the quantum well layer InxGa1-xN and the quantum barrier layer InyGa1-yN both comprise indium, gallium and nitrogen, so that lattice mismatch is reduced, compression stress caused by lattice mismatch is reduced, the piezoelectric polarization effect is weakened, meanwhile, the recombination efficiency of current carriers is improved, the external quantum efficiency is improved, and the performance of the light emitting diode is improved.

The utility model discloses an eccentric bolt, and relates to the field of eccentric bolts, the eccentric bolt comprises a bolt head, the bolt head is provided with threads, one end of the bolt head is fixedly provided with a head plate, the bolt head is provided with a circular groove, and the tail end of the bolt head is in threaded connection with a nut. On the basis of an existing bolt head, the circular groove is cut, so that the bolt head can be placed in the circular groove for installation and positioning, the nut is screwed at the tail end, overall installation and positioning can be completed, convenience and flexibility during installation can be achieved, and the installation efficiency is improved. Under the matching action of the first reinforcing teeth and the like on the first gasket, the contact area can be increased, the pressure stress of the pressure-bearing surface can be reduced, the surface of a connected piece is protected, meanwhile, the excellent durability is achieved, and under the strong vibration environment, the service life of the connected piece is prolonged. The anti-loose gasket can effectively keep the clamping force of the connecting piece, and bolt looseness caused by vibration is prevented.

Some embodiments of the present disclosure provide a semiconductor device including a contact electrically connected to a Group III-V semiconductor body layer. The metal layer stack of the contact comprises a plurality of metal layers and a metal nitride cap layer located at the topmost layer of the metal layer stack, the plurality of metal layers comprise a metal bottom layer located at the bottommost layer and having a metal element, and the metal nitride cap layer has a nitride of the metal element. And the thickness of the metal bottom layer is greater than that of the metal nitride cover layer, so that the contact element can relieve the stress of the main body layer and reduce the risk of material fracture in the semiconductor device.

A window, a display device including the window, and an electronic device including the display device are disclosed. The window includes: a glass substrate; a folding region including: a first-1 portion foldable relative to a folding axis extending in a first direction and having a uniform thickness; and a non-folding region defined to be adjacent to (or adjacent to) the folding region in a second direction perpendicular to the first direction in the unfolded state of the window, and including: a second-1 portion having a thickness that increases with increasing distance from the first-1 portion.

The invention provides a fuel gas generator capable of adapting to high overload and a solid rocket ramjet engine, and relates to the technical field of solid rocket ramjet engines, the fuel gas generator comprises a shell filled with grains, and a gas outlet is formed in one end of the shell; a buffering assembly is further arranged and comprises an elastic part and a limiting part which are fixed to each other, the limiting part abuts against the inner wall of the end, close to the air outlet, of the shell, the elastic part is arranged on the side, away from the air outlet, of the limiting part and abuts against the grain, and the elastic part and the limiting part are jointly provided with a first channel; by arranging the elastic part and the limiting part, the limiting part limits the elastic part, the elastic part buffers the grain through elastic deformation, the first channel communicates with the space on one side of the grain and the air outlet and is used for igniting the grain and circulating fuel gas after launching, and the elastic part is pressed to deform into a closed plane structure; the first channel is cut off, meanwhile, the end face of the grain can be evenly stressed, compression stress borne by the grain is reduced, and the whole structure of the grain is prevented from being damaged.

The application relates to a defibrillator, comprising: an energy storage module comprising at least two energy storage devices; an energy storage selection module for selecting the energy storage devices of a charge-discharge circuit of the defibrillator according to an energy level; and a control module configured to: in a first energy level, control the energy storage selection module to connect a first preset at least one energy storage device to the charge-discharge circuit, the total energy storage capacity of the first preset energy storage device being a first energy storage capacity; and in a second energy level, control the energy storage selection module to connect a second preset at least one energy storage device to the charge-discharge circuit, the total energy storage capacity of the second preset energy storage device being a second energy storage capacity, the second energy storage capacity being greater than the first energy storage capacity; wherein the first energy level is in a first energy range, and the second energy level is in a second energy range. The defibrillator with a single energy storage structure in the related art cannot simultaneously meet the requirements of precise defibrillation in a low-energy scene and effective defibrillation in a high-energy scene, thereby affecting the defibrillation effect and reducing the defibrillation success rate.