Abstract: This application provides a picture encoding and decoding method and apparatus. The picture encoding method provided includes: obtaining a to-be-processed picture block, where a dimension of the picture block is 2×2, and a chroma sampling rate of the picture block is higher than that of YUV4:2:0; obtaining a base layer picture block and an enhancement layer picture block based on the picture block, where a chroma sampling rate of the base layer picture block is lower than the chroma sampling rate of the picture block, and a pixel included in a first chroma component of the enhancement layer picture block does not overlap a pixel included in a first chroma component of the base layer picture block; performing encoding based on the base layer picture block to obtain a base layer bitstream; and performing encoding based on the enhancement layer picture block to obtain an enhancement layer bitstream.

Abstract: This application relates to the field of picture compression technologies, and in particular, to a picture encoding method and apparatus and a picture decoding method and apparatus. The picture decoding method includes: obtaining a side information bitstream of a to-be-decoded picture (1301); and obtaining a picture side information feature based on the side information bitstream (1302), and obtaining a preview picture based on the picture side information feature (1303). The picture side information feature is a second picture feature set obtained by performing, based on a hyperprior encoding neural network, feature extraction on a first picture feature set corresponding to the to-be-decoded picture. Based on the foregoing decoding solution, a decoder side may quickly obtain the preview picture based on the side information bitstream.

Abstract: A composite superconducting wire and a method of manufacturing the wire is disclosed. Nano-particle dispersion strengthened copper is co-drawn with Niobium rod to produce DSC-1Nb wire. n numbers of DSC-1Nb wires are then stacked in a hollow DSC tube and drawn to form a DSC-n.Nb hexagonal wire. In a separate preliminary process, Tin rod is co-deformed with Copper tube to form a Cu-1Sn wire. m DSC-n Nb wires and 1 Cu-1Sn wires are then wrapped by Niobium foil and placed into a Copper tube. This entire assembly is then drawn to a finished size. The drawn composite is then subjected to heat treatment with a final stage at 650-700° C. for about 100 hours or longer. The new wire has higher electric critical current and higher mechanical strength than the controlled conventional ones.

Abstract: A composite superconducting wire and a method of manufacturing the wire is disclosed. Nano-particle dispersion strengthened copper is co-drawn with Niobium rod to produce DSC-1Nb wire. n numbers of DSC-1Nb wires are then stacked in a hollow DSC tube and drawn to form a DSC-n.Nb hexagonal wire. In a separate preliminary process, Tin rod is co-deformed with Copper tube to form a Cu-1Sn wire. m DSC-n Nb wires and 1 Cu-1Sn wires are then wrapped by Niobium foil and placed into a Copper tube. This entire assembly is then drawn to a finished size. The drawn composite is then subjected to heat treatment with a final stage at 650-700° C. for about 100 hours or longer. The new wire has higher electric critical current and higher mechanical strength than the controlled conventional ones.