Abstract: Provided is a method for preparing a secondary battery including a battery cell. The secondary battery includes a negative electrode. The method includes: preparing a negative electrode slurry, coating the negative electrode slurry on the negative current collector, and then drying and compacting the negative electrode slurry to form a negative electrode material coating, thereby obtaining the negative electrode. Preparing the negative electrode slurry includes: dry blending a negative electrode active material, a conductive agent and a dispersant to obtain a dry blend; kneading the dry blend with a part of the first solvent to obtain a kneaded material; subjecting the kneaded material, the remaining part of the first solvent, the second solvent to a first wet blending to obtain a first wet blend; and subjecting the first wet blend, a thickener and a binder to a second wet blending to obtain the negative electrode slurry.

Abstract: An adjustable antenna array and an electronic apparatus are provided. The adjustable antenna array includes: a first substrate and a second substrate opposite to each other, and antenna sub-arrays in an array. Each of at least some antenna sub-arrays includes a phase shifter, a power division feeding network, and a plurality of radiating units. The phase shifter and the power division feeding network are between the first substrate and the second substrate. At least some radiating units are connected to the phase shifter through the power division feeding network. Antenna patterns corresponding to the plurality of radiating units at least include patterns on a side of the second substrate away from the first substrate. An area of an orthographic projection of the power division feeding network on the first substrate is smaller than an area of an orthographic projection of the phase shifter on the first substrate.

Abstract: Disclosed is a method for preparing lithium-ion batteries including: winding or sheet-stacking a positive electrode sheet, a negative electrode sheet, and a separator, and then placing them into a case to form an initial cell; injecting a first electrolyte into the initial cell, where the first electrolyte includes: 0.5 wt % to 2 wt % vinylene carbonate, 5 wt % to 15 wt % lithium salt, and non-aqueous organic solvent (all by weight); performing a formation process on the initial cell to form an initial solid electrolyte interphase film; injecting a second electrolyte into the initial cell, where the second electrolyte includes: 5 wt % to 20 wt % vinylene carbonate, 5 wt % to 15 wt % lithium salt, 0.005 wt % to 30 wt % infiltrant stabilizer, and non-aqueous organic solvent (all by weight); where the first electrolyte or the second electrolyte further includes: at least one of 1,3-propane sultone or fluoroethylene carbonate.

Abstract: Secondary battery and preparation method thereof are provided. Lithium source, iron source, phosphorus source, transition metal salt source, bismuth source, and solvent are mixed to obtain intermediate solution. PH of intermediate solution ranges from 1.0 to 4.0. Intermediate solution is subjected to hydrothermal reaction, to obtain precursor by drying. Precursor is subjected to heat treatment to obtain core. Core includes lithium iron phosphate and bismuth salt. Core is coated with coating material to obtain cathode material. Cathode material includes core and conductive polymer coating layer arranged on at least surface of core. Finally, cathode material is prepared into secondary battery. Cathode material in present disclosure has advantages of high compaction density and high conductivity, which can significantly enhance energy density, cycle performance, and high-and-low temperature performance when cathode material is applied to secondary battery.

Abstract: An image processing method includes performing, using images obtained from one or more sensors onboard a vehicle, a 2-dimensional (2D) feature extraction; performing, a 3-dimensional (3D) feature extraction on the images; detecting objects in the images by fusing detection results from the 2D feature extraction and the 3D feature extraction.

Abstract: A method of processing point cloud information includes converting points in a point cloud obtained from a lidar sensor into a voxel grid, generating, from the voxel grid, sparse voxel features by applying a multi-layer perceptron and one or more max pooling layers that reduce dimension of input data; applying a cascade of an encoder that performs a N-stage sparse-to-dense feature operation, a global context pooling (GCP) module, and an M-stage decoder that performs a dense-to-sparse feature generation operation. The GCP module bridges an output of a last stage of the N-stages with an input of a first stage of the M-stages, where N and M are positive integers. The GCP module comprises a multi-scale feature extractor; and performing one or more perception operations on an output of the M-stage decoder and/or an output of the GCP module.

Abstract: Embodiments of the present disclosure relate to the field of energy storage and provide a method for manufacturing sodium-ion rechargeable batteries. The method includes: providing a cell and disposing the cell inside a casing; performing a first injection operation on the cell disposed inside the casing using a first electrolyte, where the first electrolyte includes: 1,3-propanesultone of 0.5 wt % to 2 wt %, tris(trimethylsilyl) phosphate of 0.1 wt % to 2 wt %, fluoroethylene carbonate of 0.1 wt % to 2 wt %, a film forming additive of 0.01 wt % to 5 wt %, and at least one sodium salt; performing infiltration treatment and pre-charging treatment; performing a second injection operation on the cell disposed inside the casing using a second electrolyte, where the second electrolyte includes: 1,3-propanesultone of 5 wt % to 20 wt %, a nitriles compound of 3 wt % to 30 wt %, a water and acid removing additive of 0.005 wt % to 30 wt %, and at least one sodium salt; and allowing the cell to stand.

Abstract: A method for implementing multimedia interaction includes displaying a first user interface that includes a virtual building representing an entrance to a multimedia interaction room and a virtual object that are located in a virtual scene, in response to a movement control operation on the virtual object, displaying that the virtual object moves from a first position to a second position in the virtual scene, and, in response to that the virtual object satisfies an entry condition of the virtual building, displaying a second user interface that includes the virtual building, the virtual object, and an interaction control. The entry condition at least includes the second position being within an effective response range of the virtual building.

Abstract: The present disclosure provides a radio frequency apparatus, an antenna and an electronic device, and belongs to the field of communication technology. The radio frequency apparatus includes first and second dielectric substrates opposite to each other, first and second phase shifting structures between the first and second dielectric substrates; wherein the radio frequency apparatus further includes a first connection electrode and a second connection electrode; the first phase shifting structure and the second phase shifting structure each have a first end and a second end, the first ends of the first phase shifting structure and the second phase shifting structure are electrically connected to each other by the first connection electrode; the second ends of the first phase shifting structure and the second phase shifting structure are electrically connected to each other by the second connection electrode, to form a ring circuit structure.

Abstract: The present invention relates to computing system and method for determining a safety index of a product. The method includes: retrieving, by the computing system, a plurality of toxicity values of the product from a toxicity database, wherein the toxicity values correspond to a plurality types of the product respectively; retrieving, by the computing system, a plurality of weight values of the product from a weight database, wherein the weight values correspond to the types of the product respectively; and determining, by the computing system, the safety index of the product according to the toxicity values and the weight values.

Abstract: Methods of determining whether a toxicant is present in a consumable product, which comprise contacting a teleost embryo with an extract from a sample of the consumable product and determining whether the extract exerts a toxicity effect on the embryo.

Abstract: Methods of determining whether a toxicant is present in a cosmetic product, which comprise contacting a teleost embryo with a sample of the cosmetic product or an extract from a sample of the cosmetic product and determining whether the sample or the extract from the sample exerts a toxicity effect on the embryo.