Abstract: A semi-closed local low-vacuum laser welding device and welding method is provided. The semi-closed local low-vacuum laser welding device includes a local low-vacuum cabin, a dynamic sealing structure, a mechanical pump, and a laser welding mechanism. The local low-vacuum cabin includes a primary vacuum chamber, a secondary vacuum chamber and a tertiary vacuum chamber which are arranged in sequence, and a plate to be welded is arranged at a bottom of the primary vacuum chamber. The dynamic sealing structure is arranged at the bottom of the primary vacuum chamber, and the dynamic sealing structure is configured for connecting the primary vacuum chamber with the plate to be welded. The mechanical pump is in communication with the primary vacuum chamber and the secondary vacuum chamber. The laser welding mechanism is arranged corresponding to the local low-vacuum cabin, and is configured for welding the plate to be welded.

Abstract: Provided are a negative electrode plate and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, where the negative electrode film layer includes a negative electrode active material layer, a lithium supplement layer, and a polymer layer that are stacked. The negative electrode active material layer is located on the negative electrode current collector, the lithium supplement layer is located on a side of the negative electrode active material layer back away from the negative electrode current collector, and the polymer layer is located on a side of the lithium supplement layer back away from the negative electrode active material layer.

Abstract: This application includes an interactive control method and apparatus, a storage medium, and an electronic device. In this method, apparatus, storage medium, and device, a touch operation performed on a touch panel is recognized. A holographic projection device is configured to display a holographic projection-based virtual character. The touch panel is disposed on the holographic projection device. An interaction request is generated according to the recognized touch operation. The interaction request corresponds to an interaction with the holographic projection-based virtual character. Further the holographic projection-based virtual character is controlled to perform an interactive action associated with the interaction request.

Abstract: This application includes an interactive control method and apparatus, a storage medium, and an electronic device. In this method, apparatus, storage medium, and device, a touch operation performed on a touch panel is recognized. A holographic projection device is configured to display a holographic projection-based virtual character. The touch panel is disposed on the holographic projection device. An interaction request is generated according to the recognized touch operation. The interaction request corresponds to an interaction with the holographic projection-based virtual character. Further the holographic projection-based virtual character is controlled to perform an interactive action associated with the interaction request.

Abstract: This application includes an interactive control method and apparatus, a storage medium, and an electronic device. In these method, apparatus, storage medium, and device, a touch operation performed on a touch panel is recognized. A holographic projection device is configured to display a holographic projection-based virtual character. The touch panel is disposed on the holographic projection device. An interaction request is generated according to the recognized touch operation. The interaction request corresponds to an interaction with the holographic projection-based virtual character. Further the holographic projection-based virtual character is controlled to perform an interactive action associated with the interaction request.

Abstract: The present application proposes a method for detecting an okadaic acid based on a near-infrared photoelectric composite material, which includes the following steps: synthesizing NaYF4: Yb, Tm up-conversion nanoparticles (UCNPs) and a semiconductor material flower-like tungsten oxide (WO3) by a simple high-temperature solvothermal method; coupling the UCNPs with an okadaic acid monoclonal antibody through a classic amidation reaction to construct a competitive near-infrared photoelectrochemical immunosorbent assay (cNIR-PECIA) for okadaic acid detection. In addition, the present application employs a screen-printed carbon electrode (SPE) as the working electrode, and thus only requires a small amount of electrolytes, which is low-cost and maintenance-free.

Abstract: The present application proposes a method for detecting an okadaic acid based on a near-infrared photoelectric composite material, which includes the following steps: synthesizing NaYF4: Yb, Tm up-conversion nanoparticles (UCNPs) and a semiconductor material flower-like tungsten oxide (WO3) by a simple high-temperature solvothermal method; coupling the UCNPs with an okadaic acid monoclonal antibody through a classic amidation reaction to construct a competitive near-infrared photoelectrochemical immunosorbent assay (cNIR-PECIA) for okadaic acid detection. In addition, the present application employs a screen-printed carbon electrode (SPE) as the working electrode, and thus only requires a small amount of electrolytes, which is low-cost and maintenance-free.

Abstract: A method is performed at a computing system for customizing a user interface panel of a virtual space based on user locations. The computing system is communicatively connected to a head-mounted display wore by a user. The method includes: generating a virtual space including a user interface panel, the user interface panel having a default location in the virtual space; rendering the virtual space in the head-mounted display; measuring the head-mounted display's location in a physical space using a position tracking system adjacent the user; determining the user's location in the virtual space according to the head-mounted display's location in the physical space; and updating the user interface panel's default location in the virtual space in accordance with the user's location in the virtual space.

Abstract: The present disclosure relates to a quantum dot light-emitting layer, a quantum dot light-emitting device and preparing methods therefor and belongs to the field of liquid crystal display. The preparing method for a quantum dot light-emitting layer includes: placing a first halide AX and a second halide BX2 in a solvent; stirring and dispersing the reaction system formed by the first halide AX, the second halide BX2 and the solvent at a set temperature for a set time period; cooling the reaction system at a cooling rate of 0.1° C./24 h-1° C./24 h to generate an A4BX6 single crystal thin film containing ABX3 quantum dots, and using the A4BX6 single crystal thin film containing ABX3 quantum dots as the quantum dot light-emitting layer; wherein A includes one of Cs+, CH3NH3+ and HC(NH2)2+; B includes one of Pb2+ and Sn2+; and X includes one of Cl?, Br? and I?.

Abstract: This application includes an interactive control method and apparatus, a storage medium, and an electronic device. In these method, apparatus, storage medium, and device, a touch operation performed on a touch panel is recognized. A holographic projection device is configured to display a holographic projection-based virtual character. The touch panel is disposed on the holographic projection device. An interaction request is generated according to the recognized touch operation. The interaction request corresponds to an interaction with the holographic projection-based virtual character. Further the holographic projection-based virtual character is controlled to perform an interactive action associated with the interaction request.

Abstract: A method is performed at a computing system for rendering a content preview in a virtual space based on user locations. The computing system is communicatively connected to a head-mounted display wore by a user. The method includes: rendering a user interface panel in the virtual space, wherein the user interface panel includes multiple content posters, each having a unique location in the virtual space; measuring the head-mounted display's location in a physical space using a position tracking system adjacent the user; determining the user's location in the virtual space according to the head-mounted display's location in the physical space; and in accordance with a determination that the user's location and at least one of the multiple content posters' location in the virtual space satisfy a predefined condition, replacing the user interface panel with a content preview associated with the corresponding content poster in the virtual space.