Abstract: The present invention discloses an LED package structure, including a first pad structure and a second pad structure that are respectively electrically connected to two electrodes of an LED chip. The first pad structure and the second pad structure are insulated from each other. The first pad structure and the second pad structure are respectively electrically connected to a first polarity electrode and a second polarity electrode of the LED chip. A sum of the bottom area of the first pad structure and the bottom area of the second pad structure is 0.3 to 1 times the bottom area of the package structure of the LED chip. In this solution, a contact area between the chip and a substrate pad is enlarged by growing a larger pad structure under a small-sized chip electrode. This increases placement tolerance and allows direct application of CSP without the need for a conductive plate, thereby improving mounting yield.

Abstract: A two-dimensional topological photonic crystal cavity, a design method thereof and an application in a laser. The two-dimensional topological photonic crystal cavity comprises multiple photonic crystal supercells, the multiple photonic crystal supercells having vortex-shaped structural variation around a center of the two-dimensional topological photonic crystal cavity, and bands of the multiple photonic crystal supercells having Dirac points at balance positions of the vortex-shaped structural variation. The two-dimensional topological photonic crystal cavity, also called the Dirac vortex cavity, is characterized by having large mode field area, large free spectral range, narrow beam divergence angle, arbitrary mode degeneracy and compatibility with plurality of types of substrate material, and may be used in a surface-emitting semiconductor laser, enabling stable single-transverse-mode and single-longitudinal-mode operation, while ensuring broad-area and high-power output of a laser.

Abstract: Disclosed is a surface-emitting laser module integrated with a metalens, and an electronic device and a laser coupling system comprising the surface-emitting laser module. According to an embodiment, a surface-emitting laser module may comprises: a surface-emitting laser comprising a photonic crystal surface-emitting laser or a topological cavity surface-emitting laser, the surface-emitting laser having a light-emitting surface; and a metalens integrated at the light-emitting surface of the surface-emitting laser.

Abstract: The present application relates to the technical field of light-emitting diodes, and particularly relates to a flip-chip high-voltage light-emitting diode. The present application designs on one light-emitting unit a protruding part which faces the center position of the flip-chip high-voltage light-emitting diode, so that a vulnerable position of an isolation groove is prevented from being pressed against by an ejector pin, and meanwhile, a situation of electric leakage caused by film layer breakage is avoided, thereby improving reliability.

Abstract: Provided in is a high-voltage light-emitting diode chip, including: a substrate; at least two light-emitting units, which are arranged on a surface of the substrate, wherein each light-emitting unit includes an N-type semiconductor layer, a multi-quantum well layer and a P-type semiconductor layer; an N-electrode layer, which is electrically connected to the N-type semiconductor layer of one of the light-emitting units; a P-electrode layer, which is electrically connected to the P-type semiconductor layer of the other one of the light-emitting units; and connection electrodes, each of which includes a P-side connection portion electrically connected to the P-type semiconductor layer, an N-side connection portion electrically connected to the N-type semiconductor layer, and an intermediate connection portion connecting the P-side connection portion to the N-side connection portion, at least one connection electrode being of a continuous bent structure.

Abstract: A light-emitting diode epitaxial structure and a light-emitting diode are provided. The light-emitting diode epitaxial structure is provided with an Mg modulation layer disposed between a multi-quantum well light-emitting layer and a first hole injection layer. The average impurity doping concentration of the Mg modulation layer is A, the average impurity doping concentration of the first hole injection layer is B, and the average impurity doping concentration of an electron blocking layer is C, where B>A>C.

Abstract: The present invention relates to unsupervised tracking technology, specifically an unsupervised tracking model training strategy based on contrastive loss. The method comprises: S1: forming a constrained SSCI module using the relation between objects within a video frame and between adjacent video frames; S2: setting features of different objects in each frame as negative samples, and similar adjacent frame objects as positive sample pairs, constructing contrastive loss; S3: constraining embedded features (E_t) by variable loss based on self-supervised contrastive loss. This invention provides a contrastive loss-based training strategy for unsupervised multi-object tracking, leveraging the prior that objects in a frame must be different to enhance object similarity, and using self-supervised learning to match similar objects in short-interval frames as positive samples to boost cross-frame feature expression.

Abstract: A light emitting diode epitaxial structure and a light emitting diode are provided. The light emitting diode epitaxial structure includes a substrate, and an N-type semiconductor layer, an intermediate layer, a multi-quantum well layer and a P-type semiconductor layer which are sequentially arranged on the substrate, wherein the intermediate layer is doped with a n-type impurity, and a doping concentration of the n-type impurity is ?4×1018 atoms/cm3. In a specific implementation of the present disclosure, the n-type impurity is Si, and the intermediate layer is a GaN layer doped with Si.

Abstract: Provided are a light-emitting diode and a semiconductor device.

Abstract: A two-dimensional topological photonic crystal cavity, a design method thereof and an application in a laser. The two-dimensional topological photonic crystal cavity comprises multiple photonic crystal supercells, the multiple photonic crystal supercells having vortex-shaped structural variation around a center of the two-dimensional topological photonic crystal cavity, and bands of the multiple photonic crystal supercells having Dirac points at balance positions of the vortex-shaped structural variation. The two-dimensional topological photonic crystal cavity, also called the Dirac vortex cavity, is characterized by having large mode field area, large free spectral range, narrow beam divergence angle, arbitrary mode degeneracy and compatibility with plurality of types of substrate material, and may be used in a surface-emitting semiconductor laser, enabling stable single-transverse-mode and single-longitudinal-mode operation, while ensuring broad-area and high-power output of a laser.

Abstract: Examples are disclosed that relate to providing transition-related assistance during a presentation. One example provides a method comprising, during a rehearsal of a presentation, receiving content of the presentation. Based on the content received, a transition within the presentation is determined via a machine learning model. During a performance of the presentation, the transition is automatically enacted.

Abstract: Systems, methods, and computer-executable instructions for verifying a chat bot. Registration information for the chat bot is received that includes keywords. Queries are submitted to the chat bot and responses to the queries are received. The responses are classified using a classifier. Verification that the responses are classified as approved responses are done. The registration information is stored and the registration of the chat bot is completed based upon the verified responses. A search query that includes a search keyword is received. The search keyword is matched to the keywords associated with the chat bot. Search results that include a link to the chat bot that are based upon the search query are provided.

Abstract: Examples are disclosed that relate to providing transition-related assistance during a presentation. One example provides a method comprising, during a rehearsal of a presentation, receiving content of the presentation. Based on the content received, a transition within the presentation is determined via a machine learning model. During a performance of the presentation, the transition is automatically enacted.

Abstract: Systems, methods, and computer-executable instructions for verifying a chat bot. Registration information for a chat bot is received and stored. A search query is received from a browser that includes a search keyword. A determination if a chat bot should be included in search engine results page based upon the search query is made. The search query is matched to keywords associated with the chat bot. Using the registration information, if the chat bot is launchable from the search engine results page is determined. The chat bot is integrated in the search engine results page. The search engine results page is provided to the browser.

Abstract: Systems, methods, and computer-executable instructions for verifying a chat bot. Registration information for the chat bot is received that includes keywords. Queries are submitted to the chat bot and responses to the queries are received. The responses are classified using a classifier. Verification that the responses are classified as approved responses are done. The registration information is stored and the registration of the chat bot is completed based upon the verified responses. A search query that includes a search keyword is received. The search keyword is matched to the keywords associated with the chat bot. Search results that include a link to the chat bot that are based upon the search query are provided.

Abstract: A Portulaca oleracea L. extract feed additive and a preparation method thereof are provided. The Portulaca oleracea L. extract feed additive takes a Portulaca oleracea L. extract and a carrier as raw materials. The Portulaca oleracea L. extract is prepared by the ultrasonic auxiliary water extraction. The preparation method of the present invention has less raw material waste, high activity component content in the extract and acquisition rate of the extractum, which facilitates improving the effect efficiency and reducing production cost. The Portulaca oleracea L. extract feed additive as a natural plant feed additive is capable of improving the animal's metabolism, increasing the animal's relative weight gain, improving the animal's survival rate, reducing the disease incidence of various diarrhea symptoms, decreasing the animal's stress response and increasing the animal productivity.

Abstract: A Magnolia officinalis Rehd. et Wils. extract feed additive and a preparation method thereof are provided. The Magnolia officinalis Rehd. et Wils. extract feed additive takes a Magnolia officinalis Rehd. et Wils. extract and a carrier as raw materials. The Magnolia officinalis Rehd. et Wils. extract is prepared by the ultrasonic auxiliary water extraction. The preparation method of the present invention has less raw material waste, high activity component content in the extract and acquisition rate of the extractum, which facilitates improving the effect efficiency and reducing production cost. The Magnolia officinalis Rehd. et Wils. extract feed additive as a natural plant feed additive has a better rehabilitating effect on gastric ulcer and anti-cancer of livestock and greatly reduces the economic loss due to gastric ulcer.

Abstract: A Portulaca oleracea L. extract feed additive and a preparation method thereof are provided. The Portulaca oleracea L. extract feed additive takes a Portulaca oleracea L. extract and a carrier as raw materials. The Portulaca oleracea L. extract is prepared by the ultrasonic auxiliary water extraction. The preparation method of the present invention has less raw material waste, high activity component content in the extract and acquisition rate of the extractum, which facilitates improving the effect efficiency and reducing production cost. The Portulaca oleracea L. extract feed additive as a natural plant feed additive is capable of improving the animal's metabolism, increasing the animal's relative weight gain, improving the animal's survival rate, reducing the disease incidence of various diarrhea symptoms, decreasing the animal's stress response and increasing the animal productivity.

Abstract: A photonic-crystal surface-emitting laser (PCSEL) includes a gain medium electromagnetically coupled to a photonic crystal whose energy band structure exhibits a Dirac cone of linear dispersion at the center of the photonic crystal's Brillouin zone. This Dirac cone's vertex is called a Dirac point; because it is at the Brillouin zone center, it is called an accidental Dirac point. Tuning the photonic crystal's band structure (e.g., by changing the photonic crystal's dimensions or refractive index) to exhibit an accidental Dirac point increases the photonic crystal's mode spacing by orders of magnitudes and reduces or eliminates the photonic crystal's distributed in-plane feedback. Thus, the photonic crystal can act as a resonator that supports single-mode output from the PCSEL over a larger area than is possible with conventional PCSELs, which have quadratic band edge dispersion. Because output power generally scales with output area, this increase in output area results in higher possible output powers.