Abstract: A method for training a three-dimensional face reconstruction model includes inputting an acquired sample face image into a three-dimensional face reconstruction model to obtain a coordinate transformation parameter and a face parameter of the sample face image; determining the three-dimensional stylized face image of the sample face image according to the face parameter of the sample face image and the acquired stylized face map of the sample face image; transforming the three-dimensional stylized face image of the sample face image into a camera coordinate system based on the coordinate transformation parameter, and rendering the transformed three-dimensional stylized face image to obtain a rendered map; and training the three-dimensional face reconstruction model according to the rendered map and the stylized face map of the sample face image.

Abstract: An image rendering method includes the steps below. A model of an environmental object is rendered to obtain an image of the environmental object in a target perspective. An image of a target object in the target perspective and a model of the target object are determined according to a neural radiance field of the target object. The image of the target object is fused and rendered into the image of the environmental object according to the model of the target object.

Abstract: A wearable device includes a ground element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, and a sixth radiation element. The first radiation element has a feeding point. The first radiation element is coupled to the ground element. The third radiation element is coupled through the second radiation element to the first radiation element. The fourth radiation element is coupled through the second radiation element to the first radiation element. The fifth radiation element is coupled to the first radiation element. The sixth radiation element is coupled to the ground element. The sixth radiation element is adjacent to the fourth radiation element. An antenna structure is formed by the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, the fifth radiation element, and the sixth radiation element.

Abstract: A power converter can include: positive and negative input terminals configured to receive an input voltage; positive and negative output terminals configured to generate an output voltage; first and second power switches sequentially coupled in series between the positive input terminal and a first node; third and fourth power switches sequentially coupled in series between a second node and the negative input terminal, where there is no physical connection between the first node and the second node; a first energy storage element coupled between a common terminal of the first and second power switches and a common terminal of the third and fourth power switches; a first multi-level power conversion circuit coupled between the first node and the positive output terminal; and a second multi-level power conversion circuit coupled between the first node and the positive output terminal.

Abstract: A method of driving a switching element in a switching circuit, where the switching element comprises a plurality of power transistors coupled in parallel, can include: determining a state of a load in the switching circuit; decreasing a driving voltage of at least one power transistor in order to reduce driving loss of the switching element when a load is in a first load state; and maintaining driving voltages of the plurality of power transistors at a first threshold when the load is in a second load state.

Abstract: A virtual image generation method and apparatus, an electronic device and a storage medium which relates to the field of artificial intelligence technologies such as augmented reality, computer vision and deep learning. A specific implementation scheme involves: acquiring base coefficients corresponding to key points of a target face based on a target face picture; generating a structure of a virtual image of the target face based on a mapping relationship of spatial alignment between a preset virtual model and a standard model, a base of the standard model and the base coefficients corresponding to the key points of the target face; and performing texture filling on the structure of the virtual image based on textures of the target face picture, to obtain the virtual image of the target face.

Abstract: An integrated driver applied to a voltage converter having a switched capacitor conversion circuit, the integrated driver including: a first die having a first-type power transistor; a second die including at least one second-type power transistor, where a withstand voltage of the first-type power transistor is higher than a withstand voltage of the second-type power transistor; and where the first die and the second die are coupled in series between a high potential terminal and a low potential terminal of the voltage converter, such that the first-type power transistor receives a high voltage signal.

Abstract: A power converter can include: N switching power stage circuits, where output terminals of the N switching power stage circuits are connected in parallel, and N is a positive integer; an energy storage element coupled between an input terminal and the output terminal of the power converter, where the energy storage element is configured to periodically store energy for delivery to the output terminal of the power converter; and where after a main transistor of an M-th switching power stage circuit is turned off, a main transistor of the (M+1)-th switching power stage circuit is turned on, in order to realize zero-voltage-switching (ZVS) of the main transistor of (M+1)-th switching power stage circuit, where M is a positive integer less than N.

Abstract: A switching power supply circuit can include: an energy storage capacitor; a high-frequency switching network coupled to the energy storage capacitor, and being configured to receive a low-frequency AC input voltage, to charge the energy storage capacitor, to perform high-frequency chopping on the low-frequency AC input voltage and/or a voltage of the energy storage capacitor, and to generate a high-frequency AC signal; and a rectifier module coupled to the high-frequency switching network, and being configured to receive the high-frequency AC signal, to rectify the high-frequency AC signal, and to generate a DC signal.

Abstract: A power converter can include at least one first power stage circuit and a second power stage circuit, where each of the at least one first power stage circuit can include: at least one power switch, configured as a main power switch; a first magnetic element; a first energy storage element configured to be coupled to a first node of the first power stage circuit together with one adjacent power stage circuit, and to be charged or discharged through the adjacent power stage circuit; and an auxiliary module configured to ensure that a current flowing through the first magnetic element is not less than zero in a current discontinuous mode, where a first terminal of the second power stage circuit is coupled to an adjacent first power stage circuit.

Abstract: A method and apparatus for promoting a motion, an electronic device and a storage medium, relating to the field of image recognition technology are provided. An embodiment of the method may include: acquiring a user motion image, and acquiring three-dimensional recognition coordinates of body key points recognized in the user motion image; determining, based on the three-dimensional recognition coordinates, a user motion matching the user motion image; screening, according to a mapping relationship between user motion and body key points, a target body key point among all of the recognized body key points; acquiring three-dimensional standard coordinates of the target body key point corresponding to the user motion; and prompting a motion based on values of differences between the three-dimensional standard coordinates of the target body key point and the three-dimensional recognition coordinates of the target body key point.

Abstract: The present disclosure provides a video dubbing method, an apparatus, a device, and a storage medium. The method includes: when receiving an audio recording start trigger operation for a first time point of a target video and starting from a video picture corresponding to the first time point, playing the target video based on a timeline and receiving audio data based on the timeline; and when receiving an audio recording end trigger operation for a second time point, generating an audio recording file. The audio recording file has a linkage relationship with a timeline of a video clip taking the video picture corresponding to the first time point as a starting frame and taking a video picture corresponding to the second time point as an ending frame.

Abstract: A symmetrical tri-axial parallel spindle head capable of multi-directional fixed-point rotation, comprising three branch chains (2), a moving base (5), and a fixed base (1). A machining spindle (6) is fixedly connected onto the moving base (5). Each of the branch chains (2) comprises a servo motor (22), a branch chain rod (21), a lead screw (23), and a guide nut (25). The lead screw (23) and a linear guide rail (24) are provided in an inner cavity on one end of the branch chain rod (21). One end of the lead screw (23) is connected to the servo motor (22), the lead screw (23) passes through the guide nut (25), and the other end of the lead screw (22) is connected to the branch chain rod (21) by means a rotating pair. The guide nut (25) is mounted on the linear guide rail (24) and is rotatably connected to the fixed base (1) through a first support disc (26). The other end of the branch chain rod (21) is rotatably connected to the moving base (5) through a second support disc (28).

Abstract: The present invention provides compositions, methods, and kits related to reverse transcriptases derived from E.r. maturase.

Abstract: The present disclosure relates to water environment governance technology, and particularly discloses an urban river/lake water environment multi-interface governance and restoration method. The method is a multi-interface coordinated governance and restoration method based on “control for bottom, regulation for middle and governance for top”, including: “control for bottom”—controlling the emission of sediment nutritive salts and the dormancy and recovery of algae; “regulation for middle”—regulating primary productivity in a water body to inhibit the recovery of the algae; and “governance for top”—reducing nitrogen and phosphorus nutrients of an air-water interface to control the reproduction and growth of the algae. In the present disclosure, the water body governance and restoration technology based on interface coordination can effectively inhibit the outbreak of cyanobacteria and avoid extreme conditions in the ecosystem.

Abstract: A current sampling circuit for a multi-level DC-DC converter having first and second power switches connected in series, and a first inductor having one terminal coupled to a common node of the first and second power switches, where the current sampling circuit is configured to: receive a first signal representing a current flowing through the first power switch; receive a second signal representing a current flowing through the second power switch; and generate a third signal representing an inductor current flowing through the first inductor according to the first signal and the second signal.

Abstract: Provided are a method, an apparatus, and a device for identifying human body, including: acquiring a first original picture captured; adjusting a resolution according to the acquired picture to obtain a target picture; processing the target picture based on a preset model for human body feature point detection to determine whether the target picture includes human body information; if the target picture includes the human body information, determining human body area information in the original picture according to the human body information and inputting the human body area information into a filter, enabling that the filter determines target human body area information according to the human body area information; acquiring a next original picture captured; and determining a possible human body area in the next original picture according to the target human body area information, and performing the step of adjusting the resolution according to the possible human body area.

Abstract: A wearable device includes a first radiation element, a second radiation element, a third radiation element, and a dielectric substrate. The first radiation element has a feeding point. The second radiation element is coupled to a ground voltage, and is disposed adjacent to the first radiation element. The third radiation element is coupled to the ground voltage, and is disposed adjacent to the first radiation element. The third radiation element is at least partially surrounded by the first radiation element. The first radiation element, the second radiation element, and the third radiation element are disposed on the dielectric substrate. An antenna structure is formed by the first radiation element, the second radiation element, and the third radiation element.

Abstract: Methods for non-invasive assessment of genetic variations that make use of nucleic acid fragment length information, in particular length of fragments in circulating cell-free nucleic acids and compares the number of counts from fragments with different length.

Abstract: The disclosed embodiments concern methods, apparatus, systems and computer program products for determining sequences of interest using unique molecular index sequences that are uniquely associable with individual polynucleotide fragments, including sequences with low allele frequencies and long sequence length. In some implementations, the unique molecular index sequences include variable-length nonrandom sequences. In some implementations, the unique molecular index sequences are associated with the individual polynucleotide fragments based on alignment scores indicating similarity between the unique molecular index sequences and subsequences of sequence reads obtained from the individual polynucleotide fragments. System, apparatus, and computer program products are also provided for determining a sequence of interest implementing the methods disclosed.