Abstract: Provided are a data management method for a distributed storage system, an apparatus, and an electronic device. The method comprises: sending to each storage server a first request for acquiring data copy information; and according to the data copy information returned by each storage server in response to the first request, updating mapping data used to reflect the correspondence between the data copy information and the storage servers.

Abstract: A cryocooler includes a shell, a compression unit, an expansion unit and a vibration damping unit, where a cavity is provided in the shell; the compression unit and the vibration damping unit are located in the cavity; the compression unit is connected to the shell; the expansion unit is partially located in the cavity and communicates with the compression unit; the vibration damping unit is sleeved on the compression unit and is partially located in the compression unit and is configured to reduce vibration of the compression unit. The cryocooler has a relatively compact structure, relatively small size and relatively small weight.

Abstract: Provided are a data management method for a distributed storage system, an apparatus, and an electronic device. The method comprises: sending to each storage server a first request for acquiring data copy information; and according to the data copy information returned by each storage server in response to the first request, updating mapping data used to reflect the correspondence between the data copy information and the storage servers.

Abstract: A distributed table storage processing method, device and system, a master server to which a to-be-split slice belongs generates a splitting log of the to-be-split slice and a serial number of the splitting log after receiving a first splitting instruction for the to-be-split slice sent by a control device; sends the splitting log and the serial number of the splitting log to a slave server to which the to-be-split slice belongs, and the slave server sends a first acknowledgment message to the master server after storing the splitting log and the serial number of the splitting log; performs splitting storage on the to-be-split slice according to the splitting log to obtain a plurality of new slices when the number of the received first acknowledgment messages is not less than a first threshold; sends a second splitting instruction to each slave server, and the slave server performs splitting storage on the to-be-split slice according to the splitting log to obtain a plurality of new slices.

Abstract: The invention relates to a method and system for path planning of a wave glider, comprising acquiring historical navigation data of the glider and an underwater vehicle via a shore-based monitoring center; fitting historical navigation data nonlinearly by a deep learning neural network to obtain a trained network; acquiring real-time navigation data of the glider at an off-line end, real-time navigation data and predetermined shipping track data of the vehicle; obtaining the set of off-line optimized path planning schemes of the glider by the above data and the trained network; and determining an optimal path planning scheme of the glider by the deep learning neural network according to real-time data and constraint data of the glider at the on-line end. The invention can reasonably plan the path of the glider and ensure continuous and reliable information interaction between the glider and the vehicle.

Abstract: A method of improving grinding, grading and capacity of ores by reducing a fineness content ratio ?0 in settled ores includes providing a two-stage ore grinding and grading system including a first fully closed circuit including a grinder and a hydrocyclone, or a two-stage ore grinding and grading system including a first-stage open circuit, and controlling parameters for ore grinding and grading as follows: controlling a dc an value of a point B on a separation cone of a second-stage ?500 mm hydrocyclone; controlling a fineness content ratio ?0 in settled ores; controlling a second-stage ore grinding and grading load Q2; and acquiring a first-stage grinding, grading and capacity Q of ores.

Abstract: A deep-sea low-cost long-endurance collaborative navigation and positioning system. A shore-based monitoring center transmits a route planning solution to a wave glider. The wave glider follows an underwater vehicle to travel and feeds back state information of the wave glider and state information of the underwater vehicle to the shore-based monitoring center in real time. The shore-based monitoring center adjusts the route planning solution according to the state information in real time. The wave glider and the underwater vehicle are respectively equipped with an underwater acoustic communication machine.

Abstract: A deep-sea low-cost long-endurance collaborative navigation and positioning system. A shore-based monitoring center transmits a route planning solution to a wave glider. The wave glider follows an underwater vehicle to travel and feeds back state information of the wave glider and state information of the underwater vehicle to the shore-based monitoring center in real time. The shore-based monitoring center adjusts the route planning solution according to the state information in real time. The wave glider and the underwater vehicle are respectively equipped with an underwater acoustic communication machine.

Abstract: The invention relates to a method and system for path planning of a wave glider, comprising acquiring historical navigation data of the glider and an underwater vehicle via a shore-based monitoring center; fitting historical navigation data nonlinearly by a deep learning neural network to obtain a trained network; acquiring real-time navigation data of the glider at an off-line end, real-time navigation data and predetermined shipping track data of the vehicle; obtaining the set of off-line optimized path planning schemes of the glider by the above data and the trained network; and determining an optimal path planning scheme of the glider by the deep learning neural network according to real-time data and constraint data of the glider at the on-line end. The invention can reasonably plan the path of the glider and ensure continuous and reliable information interaction between the glider and the vehicle.

Abstract: The present invention provides a multi-stage double-acting traveling-wave thermoacoustic system, comprising three elementary units, each elementary unit comprises a linear motor and a thermoacoustic conversion device; the linear motor comprises a piston and a cylinder, the piston can perform a straight reciprocating motion in the cylinder; each thermoacoustic conversion device comprises a main heat exchanger and a heat regenerator connected in sequence, and the heat regenerator is of a ladder structure; a set of a non-normal-temperature heat exchanger, a thermal buffer tube and an auxiliary heat exchanger is connected at each ladder of the heat regenerator; and the main heat exchanger and the auxiliary heat exchanger of each thermoacoustic conversion device are connected to cylinder cavities of different linear motors respectively forming a loop structure for flow of a gas medium.

Abstract: The present invention discloses a heat-actuated double-acting traveling-wave thermoacoustic refrigeration system, comprising at least three elementary units; each elementary unit comprises a thermoacoustic engine, a thermoacoustic refrigerator, and a resonance device; the thermoacoustic engine and the thermoacoustic refrigerator comprise a main heat exchanger, a heat regenerator, a non-normal-temperature heat exchanger, a thermal buffer tube, and an auxiliary heat exchanger connected in sequence; the resonance device comprises a sealed housing, a moving part is provided in the housing for a reciprocating motion; the moving part separates the housing into at least two chambers; the main heat exchanger and auxiliary heat exchanger of each thermoacoustic engine and thermoacoustic refrigerator respectively connects to chambers of different housing, forming dual-loop structure of gas medium flow.

Abstract: The present invention provides a single-stage double-acting traveling-wave thermoacoustic system, comprising three elementary units; each unit comprises a linear motor and a thermoacoustic conversion device. The linear motor comprises a cylinder and a piston; the piston can perform straight reciprocating motion in the cylinder. The thermoacoustic conversion device comprises a first heat exchanger, a heat regenerator, a second heat exchanger, a thermal buffer tube and a third heat exchanger connected in sequence, the first heat exchanger and the third heat exchanger of each thermoacoustic conversion device are connected to cylinder cavities of different linear motors respectively, forming a loop structure of a gas medium flow. The system comprises a thermal buffer tube and a third heat exchanger, making the temperature of gas medium given feedback to the cylinder cavity of another linear motor be close to the room temperature, ensuring the piston and cylinder working at room temperature.

Abstract: The present invention provides a multi-stage double-acting traveling-wave thermoacoustic system, comprising three elementary units, each elementary unit comprises a linear motor and a thermoacoustic conversion device; the linear motor comprises a piston and a cylinder, the piston can perform a straight reciprocating motion in the cylinder; each thermoacoustic conversion device comprises a main heat exchanger and a heat regenerator connected in sequence, and the heat regenerator is of a ladder structure; a set of a non-normal-temperature heat exchanger, a thermal buffer tube and an auxiliary heat exchanger is connected at each ladder of the heat regenerator; and the main heat exchanger and the auxiliary heat exchanger of each thermoacoustic conversion device are connected to cylinder cavities of different linear motors respectively forming a loop structure for flow of a gas medium.

Abstract: The present invention discloses a heat-actuated double-acting traveling-wave thermoacoustic refrigeration system, comprising at least three elementary units; each elementary unit comprises a thermoacoustic engine, a thermoacoustic refrigerator, and a resonance device; the thermoacoustic engine and the thermoacoustic refrigerator comprise a main heat exchanger, a heat regenerator, a non-normal-temperature heat exchanger, a thermal buffer tube, and an auxiliary heat exchanger connected in sequence; the resonance device comprises a sealed housing, a moving part is provided in the housing for a reciprocating motion; the moving part separates the housing into at least two chambers; the main heat exchanger and auxiliary heat exchanger of each thermoacoustic engine and thermoacoustic refrigerator respectively connects to chambers of different housing, forming dual-loop structure of gas medium flow.

Abstract: The invention concerns a pulsed high-power compound quartz tubes flash lamp and process for manufacture. One of the most important characteristics of the present invention is that the flash lamp envelope is made of compound fused quartz glass tubes which comprises one or multilayer pure fused quartz glass layer and one or multilayer Ce-doped fused quartz glass layer. Said manufacture process comprising: 1) forming a compound quartz glass lump, 2) heating the compound quartz glass lump in intermediate frequence furnace to manufacture compound quartz glass tubes, 3) sealing electrodes in compound quartz glass tubes, 4) vacuumizing the compound quartz glass tubes and immitting gases to fabricate a pulsed high-power flash lamp.