Abstract: A preparation method includes the following steps: S1, preparing an aqueous solution of a metal salt and an aqueous solution of a precipitant, where the precipitant includes one or more selected from oxalic acid and a water-soluble oxalate; S2, mixing the aqueous solution of the precipitant and the aqueous solution of the metal salt at a shear speed of 10000 r/min or more for co-precipitation reaction; and S3, after the reaction is completed, obtaining the positive electrode active material precursor via washing and drying.

Abstract: A method for preparing the ammonium manganese iron phosphate precursor includes mixing and grinding metal source powder and phosphorus source powder to enable a low-heating-temperature solid-state reaction of each component, and then washing and drying the obtained product to obtain the ammonium manganese iron phosphate precursor, where the metal source includes an iron source, a manganese source and an optional source of a doping element M which represents doping elements at manganese and iron sites, and the phosphorus source includes triammonium phosphate.

Abstract: A composite positive electrode active material, a method for preparing the same, and an electric device are described. The method includes: providing positive electrode active material particles; providing a solid aluminum salt to make the solid aluminum salt cover a surface of the positive electrode active material particles; and providing a solid base to the positive electrode active material particles covered by the solid aluminum salt to make the solid aluminum salt and the solid base undergo an in situ solid-phase chemical reaction and generate a cladding layer covering the surface of the positive electrode active material particles, to obtain the composite positive electrode active material, wherein the cladding layer has alumina nanoparticles. The prepared alumina can uniformly cover the surface of the positive electrode active material particles, protect the positive electrode active material, and ensure the electrochemical performance of the positive electrode active material.

Abstract: The invention relates to an intelligent multi-pollutant ultra-low emission system and a global optimization method thereof. The intelligent multi-pollutant ultra-low emission system comprises a device layer, a sensing layer, a control layer and an optimization layer from bottom to top.

Abstract: Provided are a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device. The positive electrode active material having a core-shell structure, including a core and a shell cladding the core, the core has a chemical formula of LimAxMn1-yByP1-zCzO4-nDn, the shell includes a first cladding layer cladding the core, a second cladding layer cladding the first cladding layer and a third cladding layer cladding the second cladding layer, the first cladding layer includes crystalline pyrophosphates LiaMP2O7 and/or Mb(P2O7)c, the second cladding layer includes crystalline phosphate XPO4, and the third cladding layer is carbon. The positive electrode active material of the present application enables the secondary battery and electrical device to have a relatively high energy density, and good cycling performance, rate performance and safety performance.

Abstract: The present application provides a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode active material having a core-shell structure, comprising a core and a shell covering the core, wherein the core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, the shell comprises a first cladding layer covering the core, and a second cladding layer covering the first cladding layer, wherein the first cladding layer comprises pyrophosphate MP2O7 and phosphate XPO4, and the second cladding layer comprises carbon. The positive electrode active material of the present application enables the secondary battery and electrical device to have a relatively high energy density, and good cycling performance, rate performance and safety performance.

Abstract: Aspects of the disclosed technology include a method including receiving, from a user device, an identification of content; receiving, by a computing device, the identified content; accessing search engine processing logic; processing the received content using the subset of search engine processing logic, without indexing the received content to be accessed for responding to search queries from the search engine; generating a representation of a predicted search result of the received content based on the processing; and transmitting, to the user device, the representation of the predicted search result.

Abstract: The present application provides a continuous reaction system, a ferromanganese phosphate precursor, a lithium iron manganese phosphate, a preparation method, and a secondary battery. A method for preparing a ferromanganese phosphate precursor provided in the present application is a continuous preparation method, thereby improving the production efficiency, and obtaining the ferromanganese phosphate precursor with small particle size, narrow particle size distribution, high crystallinity, monocrystal phase, regular appearance, high tap density, high batch stability, and high batch consistency.

Abstract: A continuous reaction system for preparing a ferromanganese oxalate precursor may comprise a first dissolution reactor, a second dissolution reactor, a first reactor, a second reactor, a material storage tank, and an ultrasonic reactor; the first dissolution reactor may be configured to accommodate a metal salt solution required for preparing the ferromanganese oxalate precursor, and the second dissolution reactor may be configured to accommodate a precipitant solution required for preparing the ferromanganese oxalate precursor; the first reactor may include a first feed port and a first overflow port, and the first feed port of the first reactor may be interconnected to a first discharge port of the first dissolution reactor and a second discharge port of the second dissolution reactor respectively through two pipelines.

Abstract: A lithium manganese iron phosphate positive electrode active material, preparation method, a positive electrode plate, a secondary battery and an electrical apparatus are disclosed. The method comprises: mixing and grinding an iron source, a solid base and optionally a source of doping element M After grinding, impurities are removed to obtain a nanoscale iron-containing oxide; mixing the obtained nanoscale iron-containing oxide with a solvent, a lithium source, a manganese source, a phosphorus source, optionally a source of doping element N, optionally a source of doping element Q and optionally a source of doping element R in a predetermined ratio and then grinding. After grinding, granulating to obtain a powder; and sintering the powder to obtain the lithium manganese iron phosphate positive electrode active material. A lithium manganese iron phosphate positive electrode active material having both good electrochemical performance and high tap density can be obtained.

Abstract: An SVM-based secure access method for wireless terminals. Step 1, establish a wireless network security model based on the communication scenarios of the wireless terminal and the wireless base station; establish the channel feature vectors based on the wireless network security model and the frames received by the wireless base station; Step 2, use the pre-trained SVM model to examine the channel feature vectors of the frames, determining whether the frames are legitimate signals; Step 3, determine whether the wireless terminal with at least one frame sent is a legitimate terminal based on whether at least one of the frames sent is a legitimate signal. The frames sent by the wireless terminals that access the wireless base station are examined to effectively determine legitimate terminals by improving the SVM parameter combination optimization method of differential evolution and the differential evolution method with an adaptive improvement of the control parameters.

Abstract: Disclosed is a method for calculating radio interference suffered by a communication device mounted on an electric power tower. The method includes: establishing a relative position model of the communication device mounted on the electric power tower and transmission lines, calculating interference field strength of the communication device on the electric power tower, and determining whether the radio interference field strength at the mounting point satisfies the requirements.

Abstract: An intelligent power distribution device is provided, which includes a power distribution diagnosis module and a power distribution monitoring module. The power distribution monitoring module includes a power measuring and controlling instrument. The power measuring and controlling instrument is configured to connect to a power supply line to be protected, and measure power data of the power supply line. The power distribution diagnosis module is connected to the power measuring and controlling instrument, and is configured to analyze the power data uploaded by the power measuring and controlling instrument, and protect the power supply line when it is determined based on an analysis result that the power supply line requires protection. Based on the analysis result of the power data of the power supply line, the intelligent power distribution device can protect the power supply line precisely and accurately, thereby improving protection effect of the power supply line.

Abstract: An SVM-based secure access method for wireless terminals. Step 1, establish a wireless network security model based on the communication scenarios of the wireless terminal and the wireless base station; establish the channel feature vectors based on the wireless network security model and the frames received by the wireless base station; Step 2, use the pre-trained SVM model to examine the channel feature vectors of the frames, determining whether the frames are legitimate signals; Step 3, determine whether the wireless terminal with at least one frame sent is a legitimate terminal based on whether at least one of the frames sent is a legitimate signal. The frames sent by the wireless terminals that access the wireless base station are examined to effectively determine legitimate terminals by improving the SVM parameter combination optimization method of differential evolution and the differential evolution method with an adaptive improvement of the control parameters.

Abstract: Aspects of the disclosed technology include a method including receiving, from a user device, an identification of content; receiving, by a computing device, the identified content; accessing search engine processing logic; processing the received content using the subset of search engine processing logic, without indexing the received content to be accessed for responding to search queries from the search engine; generating a representation of a predicted search result of the received content based on the processing; and transmitting, to the user device, the representation of the predicted search result.

Abstract: Aspects of the disclosed technology include a method including receiving, from a user device, an identification of content; receiving, by a computing device, the identified content; accessing search engine processing logic; processing the received content using the subset of search engine processing logic, without indexing the received content to be accessed for responding to search queries from the search engine; generating a representation of a predicted search result of the received content based on the processing; and transmitting, to the user device, the representation of the predicted search result.

Abstract: The invention relates to an intelligent multi-pollutant ultra-low emission system and a global optimization method thereof. The intelligent multi-pollutant ultra-low emission system comprises a device layer, a sensing layer, a control layer and an optimization layer from bottom to top.

Abstract: Disclosed is a method for calculating radio interference suffered by a communication device mounted on an electric power tower. The method includes: establishing a relative position model of the communication device mounted on the electric power tower and transmission lines, calculating interference field strength of the communication device on the electric power tower, and determining whether the radio interference field strength at the mounting point satisfies the requirements.

Abstract: Welding wire for gas protective welding of reduced activation ferritic/martensitic steel and the manufacturing method, chemical components (weight percentage, wt %): C: 0.10˜0.15, Cr: 8.0˜9.0, W: 1.0˜1.6, V: 0.15˜0.25, Ta: 0.10˜0.17, Mn: 0.50˜0.70, Si: 0˜0.05, N: 0˜0.02, O, Ni, Cu, Al, and Co: 0˜0.01 respectively, P, S, Ag, Mo, and Nb: 0˜0.005 respectively, and balance of Fe. The welding wire has Cr equivalent weight of less than 11, Ni equivalent weight of greater than 3.5. It is manufactured with a wire rod through multi-pass drawing. The rod is subject to annealing heat treatment, tempering treatment performed between the passes of drawing. The annealing process is: the rod is at 940˜1020° C. for 20˜60 minutes, and the n cooled to below 650° C. at rate of less than 45° C./hour, air-cooled to room temperature. The tempering process is: the rod is at 760˜820° C. for 0.5˜2 hours. It reduces forming of ? ferrites in welded joints.

Abstract: This invention provides a cooperative coverage method for distribution network information perception. The cooperative coverage method includes the following steps: construction of connected cooperative coverage sets, which can cover all target nodes with as few information perception nodes as possible, and maintain the connectivity of each cooperative coverage set with connected sets construction methods based on of hierarchical clustering; Cooperative coverage set scheduling, introducing the concept of energy ratio threshold, dividing the life cycle of the system into multiple time slices, calculating the energy ratio of perception device set in each time slice to realize the set scheduling. The invention realizes the efficient utilization of the energy of the perception device through the construction and scheduling of the connected coverage set in different time slices, and improves the use efficiency of the information perception network.