53results about How to "Strong restrictive ability" patented technology

The present invention discloses one kind of composite material of modified micro plant fiber powder and natural rubber and its preparation process and application. The composite material includes natural rubber or latex 100 weight portions, modified micro plant fiber powder 1-60 weight portions, sulfur 0.5-3.3 weight portions, promoter 1.2-4.3 weight portions, antiager 1-3 weight portions and other assistant. The preparation process includes mixing, forming, vulcanizing and other steps. The composite material has high tensile strength, high tearing strength, high ageing resistance, high virus permeation resistance, etc. and may be used widely in making urinary catheter, blood transfusion tube, condom, medical gloves and other products.

The invention discloses a deep ultraviolet LED with an AlGaN / h-BN multi-quantum well structure, which comprises: a substrate, an AlN template layer, an n-type Al x Ga 1‑x N layer, Al y Ga 1‑y N / h‑BN multiple quantum well layer, p-type Al z Ga 1‑z N layer, p-type GaN contact layer. Al y Ga 1‑y N / h‑BN multiple quantum well layers including: Al y Ga 1‑y N quantum well layer and h-BN quantum barrier layer; wherein, Al y Ga 1‑y The range of Al composition y in the N quantum well layer is 0.5≤y≤0.7, and the thickness is 2-4nm; the thickness of the h-BN quantum barrier layer is 5-10nm. The disclosure can improve the problems of difficult hole injection, electron leakage and mismatch stress of the deep ultraviolet LED, thereby improving the luminous efficiency of the deep ultraviolet LED.

The invention discloses a winglet device which comprises a wingtip connecting part (1), ratchet wheel sleeves (2), ratchet wheel rods (3) and pressing bolts (4), wherein the wingtip connecting part (1) is connected to a wingtip of a wing; one side of the wingtip connecting part (1) is provided with two or more U-shaped grooves; two inner end surfaces of each U-shaped groove are respectively provided with a ratchet wheel groove in the shape of a non-revolving body and a threaded hole; the ratchet wheel sleeve (2) is arranged in the ratchet wheel groove, the shape of each ratchet wheel sleeve is consistent with that of the corresponding ratchet wheel groove, and a ratchet-wheel-shaped through hole is formed in each ratchet wheel sleeve; each ratchet wheel rod (3) comprises a ratchet wheel part and a connecting part, wherein the connecting part is connected to the winglet, the periphery of the ratchet wheel part is consistent with the through hole in shape, and the ratchet wheel part is arranged in the through hole of the ratchet wheel sleeve (2) in a sleeved mode; a threaded end of each pressing bolt (4) is screwed in the corresponding threaded hole, and the other end of each pressing bolt (4) axially presses one end surface of the corresponding ratchet wheel rod (3) connecting part to limit axial movement of the corresponding ratchet wheel rod (3). According to the winglet device, the ratchet wheel structure is relatively small in space occupancy, lighter in weight and highly adjustable in angle.

The invention discloses a yarn guide pulley for a diamond wire-electrode cutting lathe, which is a "-"-shaped slot nonmetal guide pulley. A preparation method comprises the following steps: S1, processing a nonmetal composite material to a ring shape; and S2, processing a "-"-shaped slot in the ring shape in the S1 according to diameter of the yarn and processing four fixed screw holes according to square distribution to obtain the "-"-shaped slot nonmetal guide pulley. Compared with the prior art, the loss of the diamond yarn can be reduced and the cutting quality can be improved.

The utility model provides a periodically poleddomain reverse lithium niobate optical waveguide which comprises a substrate, a waveguide layer arranged on the substrate, an upper photonic crystal and a lower photonic crystal; the lower photonic crystal is grown between the substrate and the waveguide layer; the upper photonic crystal is grown on the waveguide layer; the upper photonic crystal andthe lower photonic crystal can lead both the fundamental frequency light-wave length and the frequency doubling light-wave length of the periodically poleddomain reverse lithium niobate optical waveguide in a photonic forbidden band; and one-dimensional, two-dimensional or three-dimensional photonic crystals are adopted as the upper photonic crystal and the lower photonic crystal. As the photoniccrystals are both prepared on an upper coating and a lower coating of the waveguide layer, and the periodically poleddomain reverse lithium niobate optical waveguide is combined with the photonic crystals, the optical waveguide loss is low and the conversion efficiency is high.

The invention discloses a strain multiple quantum well laser device based on GeSn / SiGeSn material and a manufacturing method thereof. A barrier layer adopts a GeSiSn material; and the barrier layer adopts a GeSn material. A pseudo substrate (Ge), a buffer layer (GeSn) and an active area (GeSn / GeSiSn) are vertically distributed on a substrate (Si) from bottom to top in sequence, and an Si3N4 tensile stress film is wrapped around the pseudo substrate, the buffer layer and the active area. The manufacturing method of the laser device disclosed by the invention comprises the following steps: (1) adopting a low-temperature solid-source molecular beam epitaxy growth technology to grow the GeSn and GeSiSn materials; and (2) adopting a standard laser device manufacturing technology to process the device. Through a multiple quantum well structure and the tensile strain introduced by the additionally added Si3N4 stress film, red shift occurs for the laser wavelength of the laser device, the optical gain of the laser device is obviously improved, and the threshold value is greatly reduced.