Abstract: A positive active material, a secondary battery, a battery module, a battery pack, and an electrical device are disclosed. The positive active material includes a spinel-type lithium-manganese-containing composite oxide with a molecular formula of Li1+xAaMbXcMn2?a?b?c?xO4?t. In the molecular formula: A is a doping element for a manganese site of the spinel-type lithium-manganese-containing composite oxide; M is used for combining with O to form a second phase containing a polyoxyanion, and M includes one or more of B, C, N, Si, P, S, or Cl; X includes one or more of Mg, Al, Si, Ca, Sc, Ti, Cr, Fe, Co, Ni, Cu, Zn, or Zr; and the molecular formula satisfies: ?0.1?x?0.3, 0<a?0.2, 0<b?0.2, 0<c?0.7, and 0?t?0.2.

Abstract: A soil conditioner spreader and an operation method thereof are provided. The soil conditioner spreader includes a spreader body, a ridger, a solid tank, two spiral drills, a rotary tillage wheel and a mulching device, where the spreader body is provided with a hopper in a front part. The hopper stores a conditioner. The solid tank is arranged above the spiral drills. The spreader body is connected to the solid tank through a feeding track. The ridger, the spiral rills, the rotary tillage wheel and the mulching device are successively arranged at the bottom of the spreader body from the rear to the front. The ridger ridges first, and then the spiral drills perform deep plowing, rotary tillage and scarification and apply the conditioner to a ridge. The rotary tillage wheel performs rotary tillage, and a nozzle sprays a nutrient solution or an herbicide/insecticide. Finally, the mulching device mulches.

Abstract: The present disclosure provides a speaker adapter, and a dual core speaker assembly. The speaker adapter includes: a main body, symmetrically provided with two mounting portions at both sides for matching with speakers respectively; a bottom base, extending from and around the main body, for supporting the main body; and an inner cavity formed within the main body.

Abstract: Disclosed are a Radio Resource Control (RRC) state transition method, a terminal, a Centralized Unit (CU), a Distributed Unit (DU) and a computer-readable storage medium. The RRC state transition method includes: when a terminal changes from a current state to an RRC connected state, the terminal requests to resume an RRC connection by using an existing Signaling Radio Bearer (SRB) configuration; when the terminal receives a response from a Distributed Unit (DU) for request of resuming the RRC connection, if the response comprises a newly allocated SRB configuration, the terminal replaces the existing SRB configuration with the newly allocated SRB configuration to resume the RRC connection.

Abstract: This disclosure relates to a radiation-curable liquid composition, comprising following components: (A) at least one radiation-curable reactive component; (B) at least one photoinitiator; and (C) at least one expandable microsphere and/or lightweight filler, relates to a 3D-printed object formed from the radiation-curable liquid composition as well as a process of forming the 3D-printed object. The 3D-printed object formed from the composition shows excellent energy return property and good mechanical property as well as low density and foam structure.

Abstract: Provided are an electrode active material, a method for preparing the electrode active material, an electrode plate, and a battery. The electrode active material includes carbon-coated metal oxide particles. The metal oxide particles satisfy a formula (2): AcMdOe??(2), where element A is selected from one or more of alkali metal elements or alkaline earth metal elements; element M is selected from one or more of transition metal elements having a relative atomic mass smaller than 65; and c>0, d>0, and e>0.

Abstract: An optical component (1) comprising a planar metasurface (2) arranged on a surface of a first substrate (3) and a top layer (4) arranged in a height direction Z above the metasurface (2), wherein the metasurface (2) comprises an array (9) of scattering structures (5, 5a, 5b), wherein the array (9) is a repeating pattern of unit cells (7), wherein a unit cell (7) comprises at least two different scattering structures wherein the optical properties of the metasurface (2) are controllable by a control signal, wherein first scattering structures (5, 5a) are at least partially contacting a layer of a first substance (6a) having a first refractive index and second scattering structures (5, 5b) are at least partially contacting a layer of a second substance (6b), which differs from the first substance (6a) and which provides a variable refractive index depending on the control signal.

Abstract: Provided are a lithium-ion battery positive electrode plate, comprising a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material mixture composed of the following materials: polycrystalline particles of a first positive electrode active material with a particle size of 11.0-20.0 ?m; polycrystalline particles of a second positive electrode active material with a particle size of 6.0-10.5 ?m; and monocrystalline particles of a third positive electrode active material with a particle size of 1.1-5.2 ?m; wherein the number of the polycrystalline particles of the first positive electrode active material is a, the number of the polycrystalline particles of the second positive electrode active material is b, the number of the monocrystalline particles of the third positive electrode active material is c, and (a+b):c is in the range of 5.7:4.3 to 7.7:2.3.

Abstract: A splicing display screen defined with a plurality of sub-areas is provided. The splicing display screen includes a first substrate, a first metal layer, a plurality of driving ICs, a control unit, and a plurality of display screen units. The first metal layer is disposed on the first substrate, and each driving IC is buried in a groove of a corresponding sub-area and is electrically connected to a circuit of the first metal layer. The control unit is electrically connected to the plurality of driving ICs, and the plurality of display screen units correspond to the plurality of sub-areas in a one-to-one manner. The plurality of display screen units are disposed on the first metal layer and electrically connected to the first metal layer.

Abstract: A positive electrode active material and a preparation method thereof, a secondary battery, and an electric apparatus are provided. The positive electrode active material in the present invention includes: a core, where the core is a lithium-containing phosphate; a first coating layer disposed on at least part of surface of the core, where the first coating layer is a carbon coating layer co-doped with titanium and nitrogen; and a second coating layer disposed on at least part of surface of the first coating layer, where the second coating layer includes Li1+xMxTi2?x(PO4)3, where M is at least one element selected from aluminum, lanthanum, indium, zirconium, gallium, and scandium, and 0.2?x?0.8. With use of the positive electrode active material of the present invention, a high discharge capacity, excellent rate performance, and excellent cycling performance can be achieved.

Abstract: A positive electrode material includes a core including a lithium-rich manganese-based positive electrode material, and a coating layer enveloping outer surface of the core and including a composite material of a transition metal oxoacid salt and carbon. The transition metal in the transition metal oxoacid salt is selected from at least one of Ti, Mo, W, V, Ta, Nb or Nd and the composite material has a mesh structure.

Abstract: Computer technology for protecting data security in a computerized system for recommending content to users where, a processing unit generates an identifier for a first data record relating to a user device based on a first machine learning model. Then, the processing unit sends the identifier to a service provider, and the service provider uses the identifier to determine one or more contents to be sent to the user device. Creating and using a decision tree machine learning (ML) model and a cluster ML model with training records and a transformed records.

Abstract: A secondary battery includes a positive electrode sheet having a positive electrode active material and a non-aqueous electrolyte. The positive electrode active material includes a central core material and a modification layer disposed on a surface of the central core material. The modification layer including an orthophosphate with a molecular formula Aa+x[PO4]3?y, where A denotes one or more of Li, Na, K, Rb, Cs, Mg, Ca, Ba, Ni, Fe, Co, Ti, Al, Cr, V, Nb, and W, 1?a?6, and ax=3y. The non-aqueous electrolyte includes a fluorinated phosphate with a molecular formula Bb+m[PO1+cF3-c]c?n, where B denotes one or more of Li, Na, K, Rb, Cs, Mg, Ca, and Ba, 1?b?2, c denotes 1 or 2, and bm=cn.

Abstract: A photovoltaic tile, a photovoltaic power generation system, and a method for mounting photovoltaic tile. The photovoltaic tile includes color steel tiles, adjacent color steel tiles are fixedly connected to each other, the color steel tiles each include a male rib, a female rib, and a folding portion, the male rib and the female rib are respectively arranged at two opposite ends of the color steel tile along a width direction, the folding portion is arranged between the male rib and the female rib, and the female rib is fixedly connected to the male rib of an adjacent color steel tile to form a connecting end; fixing devices mounted on the folding portions; and photovoltaic modules each having two ends respectively connected to the fixing devices of adjacent folding portions. When the photovoltaic module is mounted on the color steel tile, the connecting end supports the photovoltaic module.

Abstract: This application provides a composite positive-electrode material and a preparation method thereof, a positive-electrode plate, a secondary battery, and a battery module, a battery pack, and an apparatus containing such secondary battery. The composite positive-electrode material includes a core and a coating layer covering at least part of a surface of the core, where the core includes a positive-electrode pre-lithiation material, the positive-electrode pre-lithiation material includes a lithium-rich metal oxide, and the coating layer includes a positive-electrode active material.

Abstract: Methods, apparatus, computer program products for tracking sensitive data are provided. A method for tracking sensitive data comprises identifying, by one or more processing units, for a type of sensitive data, at least one key interface that carries the type of sensitive data and recording the at least one key interface. The method further comprises generating, by one or more processing units, for the type of sensitive data, for each type of sensitive data, a series of service nodes based on the at least one key interface, and monitoring, by one or more processing units, for the type of sensitive data, corresponding data traffic flowing through corresponding series of service nodes, based on the identified at least one key interface.

Abstract: A positive electrode plate is provided. The positive electrode plate comprises a positive electrode current collector, a positive electrode active material layer provided on at least one surface of the positive electrode current collector, and a lithium supplementing layer provided on a surface of the positive electrode active material layer opposite to the positive electrode current collector. The lithium supplementing layer comprises a positive electrode lithium supplementing material, a conductive agent and a binder A, the positive electrode lithium supplementing material comprises a lithium-rich metal oxide, and the binder A is selected from polymers containing a first monomer unit shown by a formula I and a second monomer unit shown by a formula II, where the R1, R2, R3, R4, R5 and R6 are each independently selected from hydrogen or substituted or unsubstituted C1 to C8 alkyl, and the R is selected from substituted or unsubstituted C1 to C8 alkyl.

Abstract: A negative-electrode active material includes a carbon matrix, boron, and iron distributed in an interior of the carbon matrix.

Abstract: Training a predict model with network traffic and data change messages generated by an existing web application running in a production environment. The predict model being is trained to predict data changes resulted from API calls embodied in network traffic. A stream of network traffic of the existing web application is replayed with an upgraded version of the existing web application to generate real data changes. The stream of network traffic is applied to the predict model to generate predicted data change messages. The predicted data change messages are comparing with real data change messages representing the real data changes. One or more existing APIs is identified as being possibly functionally degraded based on any inconsistency of the predicted data change messages with the real data change messages.

Abstract: In an approach, a processor obtains a configuration file of a distributed file system federation, the configuration file comprising a list of a plurality of subclusters within the distributed file system federation and migration trigger factors for the plurality of subclusters. A processor determines a list of one or more source subclusters and a list of to-be-migrated directories in the one or more source subclusters based on a scanning result of the plurality of subclusters and the migration trigger factors in the configuration file. A processor generates a migration plan to migrate the to-be-migrated directories from the one or more source subclusters to one or more target subclusters in the distributed file system federation.