Abstract: A light emitting device includes a light-emitting laminate and an insulating reflective structure. The insulating reflective structure includes n pairs of dielectric layers stacked on the light-emitting laminate. Each of the n pairs of dielectric layers includes a first material layer and a second material layer. The first material layer has a first refractive index, and the second material layer has a second refractive index that is greater than the first refractive index of the first material layer. For each pair of dielectric layers among m1 pairs of dielectric layers out of the n pairs of dielectric layers, the first material layer has an optical thickness that is greater than that of the second material layer, where 0.5n?m1?n, and n and m1 are natural numbers greater than 0.

Abstract: Provided are an LED chip and a light emitting device, which include a light emitting epitaxial layer, a first insulating layer covering the light emitting epitaxial layer, and a first pad and a second pad located on the first insulating layer. Each of the first pad and the second pad includes a stress buffer layer, a nickel metal layer, and a protective layer. The stress buffer layer includes aluminum metal layers; and by adjusting the thickness distribution of the aluminum metal layers, an aluminum metal layer closest to the nickel metal layer is set to be the thickest, and the aluminum metal layers are thickened, especially the thickness of the aluminum metal layer closest to the nickel metal layer is greater than or equal to the thickness of the nickel metal layer, therefore, the ductility and tensile property of aluminum metal are utilized to play a role in stress buffering.

Abstract: A flip-chip light emitting diode includes an epitaxial structure, a first electrode, and a second electrode. The epitaxial structure includes a first semiconductor layer, a light emitting layer, and a second semiconductor layer. The light emitting layer is located between the first semiconductor layer and the second semiconductor layer. The first electrode is located on the epitaxial structure and is electrically connected to the first semiconductor layer. The second electrode is located on the epitaxial structure and is electrically connected to the second semiconductor layer. The first electrode and/or the second electrode is a multilayer metal structure. The multilayer metal structure includes a metal reflective layer, a first barrier layer, and a conductive metal layer stacked in sequence on the first semiconductor layer. A thickest layer in the multilayer metal structure is the conductive metal layer, and the conductive metal layer is an Al layer.

Abstract: A steroidal piperidone derivative, a synthesis method, and a use thereof are provided. The steroidal piperidone derivative has a chemical structure shown in general formula (1) or general formula (2), where R is any one selected from the group consisting of alkyl, phenyl, substituted phenyl, and a heterocycle. In the synthesis method of the steroidal piperidone derivative, dehydroepiandrosterone (DHEA) is used as a basic raw material to prepare the steroidal piperidone derivative of the present disclosure through a series of reactions. A product prepared by the synthesis method has a high yield and is easily separated, and thus the synthesis method is the optimal method for preparing the steroidal piperidone derivative of the present disclosure. The present steroidal piperidone derivative exhibits prominent toxic activity against sucking pests, such as aphids, spider mites, rice planthoppers, and B. tabaci, and can be used for the control of a plant pest.

Abstract: A steroidal piperidone derivative, a synthesis method, and a use thereof are provided. The steroidal piperidone derivative has a chemical structure shown in general formula (1) or general formula (2), where R is any one selected from the group consisting of alkyl, phenyl, substituted phenyl, and a heterocycle. In the synthesis method of the steroidal piperidone derivative, dehydroepiandrosterone (DHEA) is used as a basic raw material to prepare the steroidal piperidone derivative of the present disclosure through a series of reactions. A product prepared by the synthesis method has a high yield and is easily separated, and thus the synthesis method is the optimal method for preparing the steroidal piperidone derivative of the present disclosure. The present steroidal piperidone derivative exhibits prominent toxic activity against sucking pests, such as aphids, spider mites, rice planthoppers, and B. tabaci, and can be used for the control of a plant pest.

Abstract: A light-emitting device includes a substrate and an epitaxial unit. The substrate has a first and a second surface. The substrate is formed on the first surface with a plurality of protrusions. The epitaxial unit includes a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially disposed on the first surface of the substrate. The first surface of the substrate has a first area that is not covered by the epitaxial unit, and a second area this is covered by the epitaxial unit. A height difference (h2) between the first area and the second area is no greater than 1 ?m. A display apparatus and a lighting apparatus are also disclosed.

Abstract: A flip light-emitting diode (LED) and a semiconductor light-emitting device are provided. The flip-chip LED includes a substrate, a semiconductor stacking layer formed on a first surface of the substrate for radiating light, and an optical thin film stacking layer formed on a second surface of the substrate and including a first reflective film group. The first reflective film group includes a first material layer and a second material layer repeatedly stacked. Optical thicknesses of the first and second material layers meet: the first reflective film group reflects a light with a wavelength in a range from 420 nm to 480 nm and at an incident angle being a first angle, and partially transmits a light with the wavelength and at an incident angle being a second angle, and the first angle is smaller than the second angle. The brightness of the flip-chip LED can be improved.

Abstract: A light emitting diode device includes a substrate having a substrate surface, an epitaxial structure having an epitaxial surface opposite to the substrate surface, and a plurality of bridging electrodes disposed on the epitaxial surface. The epitaxial structure includes first, second and third light emitting units spacedly and sequentially disposed on the substrate surface. A projection of the second light emitting unit has a first edge and a second edge that is connected with and perpendicular to the first edge. The epitaxial surface has an operating zone on the second light emitting unit that is adapted to be pushed by an ejector pin. A length of the second edge is equal to or greater than a diameter of the operating zone.

Abstract: The present disclosure relates to a sub-frame cleaning and blow-drying device, comprising a rack, a water tank, a bottom lifting assembly, supporting assemblies, a top lifting assembly, a rotating assembly, an expanding and cleaning-off assembly and a blow-drying device. Expanding assemblies expand to be connected with vehicle body mounting holes, compressed air is blown into the vehicle body mounting holes by air outlets and is blown into a cavity of a sub-frame to clean off aluminum scraps and residual sand in the cavity of the sub-frame, the rotating assembly drives the expanding and cleaning-off assembly and the sub-frame to do rotation movement to perform secondary cleaning, so that the aluminum scraps and the sand remaining inside the cavity can be cleaned off, and the sub-frame cleaning and blow-drying device can be flexibly adjusted by a position adjusting assembly according to different types of sub-frames and is strong in universality.

Abstract: Disclosed is a wheel airtight rubber ring press-fitting device, consisting of a frame, first servo motors, ball screw pairs, first guide rails, a first cylinder and the like. The device may be used for automatic continuous production. The central axis of an airtight rubber ring coincides with the central axis of the outer rim of a wheel, so that the positioning precision is improved, and high-precision press-fitting is realized. Through cyclic switching of double manipulators, the press-fitting feeding time is nested, the press-fitting cycle is shortened, and the working efficiency is improved.

Abstract: The present disclosure relates to a sub-frame cleaning and blow-drying device, comprising a rack, a water tank, a bottom lifting assembly, supporting assemblies, a top lifting assembly, a rotating assembly, an expanding and cleaning-off assembly and a blow-drying device. Expanding assemblies expand to be connected with vehicle body mounting holes, compressed air is blown into the vehicle body mounting holes by air outlets and is blown into a cavity of a sub-frame to clean off aluminum scraps and residual sand in the cavity of the sub-frame, the rotating assembly drives the expanding and cleaning-off assembly and the sub-frame to do rotation movement to perform secondary cleaning, so that the aluminum scraps and the sand remaining inside the cavity can be cleaned off, and the sub-frame cleaning and blow-drying device can be flexibly adjusted by a position adjusting assembly according to different types of sub-frames and is strong in universality.

Abstract: A water-cooled mold for low-pressure casting of an aluminum alloy wheel includes an upper mold, a lower mold and a side mold which surround a cavity of aluminum alloy, in which a cooling insert is embedded into a side mold frame of the side mold; an upper parting surface, a lower parting surface and a side parting surface of the cooling insert are respectively in contact parting with the side mold frame, the side parting surface includes a front zone and a rear straight zone, and a gap of 1.5-2.5 mm is formed between the rear straight zone and the side mold frame.

Abstract: A water-cooled mold for low-pressure casting of an aluminum alloy wheel includes an upper mold, a lower mold and a side mold which surround a cavity of aluminum alloy, in which a cooling insert is embedded into a side mold frame of the side mold; an upper parting surface, a lower parting surface and a side parting surface of the cooling insert are respectively in contact parting with the side mold frame, the side parting surface includes a front zone and a rear straight zone, and a gap of 1.5-2.5 mm is formed between the rear straight zone and the side mold frame.

Abstract: Disclosed is a wheel airtight rubber ring press-fitting device, consisting of a frame, first servo motors, ball screw pairs, first guide rails, a first cylinder and the like. The device may be used for automatic continuous production. The central axis of an airtight rubber ring coincides with the central axis of the outer rim of a wheel, so that the positioning precision is improved, and high-precision press-fitting is realized. Through cyclic switching of double manipulators, the press-fitting feeding time is nested, the press-fitting cycle is shortened, and the working efficiency is improved.

Abstract: Disclosed is a wheel front burr cleaning device. The device is composed of a rack (1), a lifting cylinder (2), a support frame (3), guide posts (4), guide sleeves (5), a lifting table (6), a brush (7), bearing seats (8) and the like, wherein a servo motor I (11) is fixed on the side of the rack (1), the output end of the motor is connected with a turnover platform (10) via a coupling (12), the middle part of the turnover platform (10) is a cuboid, circular shafts are arranged on the left side and right side of the turnover platform (10), and the shafts are matched with bearings (9); and the structures above and below the turnover platform (10) are completely consistent, wheel positioning clamping rotating systems are distributed symmetrically, and the servo motor I (11) controls the turnover platform (10) to rotate 180 degrees every time, thereby realizing cyclic switching of the positioning clamping systems above and below the turnover platform (10).