Abstract: A 3D printing method for an impact-resistant gradient complex part containing a hollow ceramic sphere complex, wherein the method includes the following steps: 1) designing the size and shape of the part as well as an internal layered structure; 2) providing a raw material, wherein the raw material contains a high polymer, a curing agent and hollow ceramic spheres; and 3) providing the raw material with a certain thickness according to a design, then, curing the raw material by using a heat source to form a high polymer layer containing the hollow ceramic spheres, and repeatedly printing the high polymer layer according to the design until the high polymer layer reaches the designed thickness to form the impact-resistant gradient complex part.

Abstract: A cyber-physical integrated restoration method and system for distribution systems based on emergency mobile communications are provided. After extreme natural disasters which cause serious damage to distribution systems, damages of distribution systems are evaluated through system feedback data. When ground communication base stations are unavailable due to the damages, the method can make full use of existing wireless emergency communication resources to provide emergency communication services, and quickly restore the power supply through distribution automation functions with supports of the backup battery of automatic terminal devices, so as to effectively improve the resilience of distribution systems.

Abstract: An alginate hydrogel-based thin-film heat flux sensor for billet crystallizer includes an alginate hydrogel substrate. The alginate hydrogel substrate is configured in a U-shaped planar structure. The U-shaped planar structure includes a first side and a second side, and the first side is longer than the second side. An inner surface of the alginate hydrogel substrate is provided with a first film thermocouple and a second film thermocouple. The first film thermocouple is in crosslinking connection with the second film thermocouple.

Abstract: A hydrogel includes a polysaccharide including aldehyde groups and carboxy groups, a functionalized chitosan, and iron (III) ions. The hydrogel further includes particles including a core including a carboxy-functionalized polythiophene and a shell including polydopamine. A wound dressing includes the hydrogel and a base layer selected from the group consisting of a gauze, lint, plaster, bandage and cotton wool. The hydrogel is attached or adhered to the base layer.

Abstract: The present disclosure provides a data processing method, a device, a computer apparatus and a storage medium, wherein the method includes: in response to a target disk receiving at least one write request within a preset time period, determining a size threshold value for classifying a data update type according to a size of write data respectively indicated by each write request; determining a data update type corresponding to each write request according to a size of each write request and the size threshold value; dividing write data of the write request to obtain a data block according to a preset data block size, and caching the data block in a cache region of the target disk corresponding to the data update type, the target disk has multiple types of cache regions configured therein, different cache regions are configured to support caching of data with different update frequencies.

Abstract: Disclosed are an online vacuum degree detection system and method based on single-fiber laser-induced breakdown spectroscopy. In the system, a laser device generates laser that excites the laser through fiber induced breakdown spectroscopy; a fiber coupler couples and injects the laser; a single fiber is connected to the fiber coupler to transmit the laser; one end of an LIBS probe is connected to the single fiber, and the other end of the LIBS probe extends into a vacuum arc-extinguishing chamber; the laser is induced by the LIBS probe to generate plasma, and the plasma is subjected to self-emission imaging and enters the fiber coupler via the LIBS probe; a dichroscope is arranged on the fiber coupler to separate the laser from the plasma; a processor is connected to a camera and a spectrometer.

Abstract: An internal combustion engine with an external circulation system and a working method thereof are provided. The internal combustion engine is externally connected to the external circulation system through an intake port and an exhaust port. The external circulation system is capable of operating in a circulating manner when the internal combustion engine is not running, a significant raise in intake temperature is achieved during intake heating or exhaust heating, thereby the cold start-up performance of the internal combustion engine is improved and harmful emissions during cold start-up is reduced, and a compression ignition working mode of a low compression ratio engine is facilitated to be achieved.

Abstract: A method of preparing biodegradable Zn—Mg—Bi zinc alloy includes: melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain Mg-50 wt. % Bi alloy ingot; melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth followed by heating to a preset temperature, stirring and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in a furnace followed by refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

Abstract: A cyclical salinity-gradient power generating system based on phase change materials and solar photothermal conversion is provided. The system comprises a solution supplying device, a power generating device and a power output device. The solution supplying device provides seawater with high and low concentration as salinity-gradient energy source of the power generating device; the power generating device implements day-and-night cyclical salinity-gradient power generation; the power output device stores electricity, part of which is used as providing power for the pumps inside the system and part of which is used as system output. A cyclical salinity-gradient power generating method based on phase change materials and solar photothermal conversion is also provided.

Abstract: The disclosure discloses a Lamb wave phased array focus-imaging method based on a frequency response function. In the method, a piezoelectric sensor array is arranged on a surface of a tested structure, the frequency response function of an excitation and acquisition pair formed by an excitation array element and an acquisition array element is calculated according to a full-band response signal, and a dispersion pre-compensation signal is constructed; the dispersion pre-compensation signal and the frequency response function are multiplied in a frequency domain to obtain a frequency domain pre-compensation response signal; and according to a distance from the acquisition array element to a focal point at the coordinates, the dispersion of the frequency domain pre-compensation response signal is post-compensated, so as to obtain a frequency domain dispersion post-compensation signal until all sensor excitation and acquisition pairs are traversed.

Abstract: The present disclosure provides a data processing method, a device, a computer apparatus and a storage medium, wherein the method includes: in response to a target disk receiving at least one write request within a preset time period, determining a size threshold value for classifying a data update type according to a size of write data respectively indicated by each write request; determining a data update type corresponding to each write request according to a size of each write request and the size threshold value; dividing write data of the write request to obtain a data block according to a preset data block size, and caching the data block in a cache region of the target disk corresponding to the data update type, the target disk has multiple types of cache regions configured therein, different cache regions are configured to support caching of data with different update frequencies.

Abstract: An EBM variable-direction formation dynamic slicing method in cooperation with an 840D digital control system includes: creating a vertex array object, adjusting a projection matrix to a slice height, outputting a binary image of a two-dimensional cross-section; obtaining, by means of two-dimensional contour extraction, data of a contour line from the binary image, outputting coordinates of a closed contour, and connecting all adjacent coordinates into a straight line to form a closed curve; when a triangle tolerance is 1, dividing contour data into a straight line part and a curve part by taking a starting point of small straight lines with an angle of 140° therebetween as a dividing point, removing adjacent points, repeated points and internal points of a same straight line, and performing segmentation fitting on curve parts of the slice data, and then performing dynamic slicing through the 840D numerical control system.

Abstract: The disclosure discloses a magnetic bias active suppression method and system of a hybrid distribution transformer, whether the HDT is closed or not is judged based on the grid-side current, and accordingly smooth switching of the two sets of control strategies is achieved; excitation currents of an HDT main transformer and an isolation transformer are calculated based on a magnetic potential balance principle, and nonlinear feedback is performed, and the excitation currents are superposed after an original control instruction of an HDT converter, so that magnetic bias suppression is realized on the basis of ensuring an HDT grid-side current and load voltage control function. According to the system, a complex and expensive iron core magnetic flux sensor does not need to be additionally arranged, and the DC magnetic bias of the HDT under any working condition can be eliminated while the basic control function of the HDT is not affected.

Abstract: A method for evaluating the mechanical state of a high-voltage shunt reactor based on vibration characteristics is disclosed, relating to the technical field of electrical equipment fault diagnosis. The method includes: based on historical state data and real-time vibration and noise signal data of the high-voltage shunt reactor and through an LSTM neural network time series prediction method, comparing deviation between predicted characteristic value and actual characteristic value, and determining whether the high-voltage shunt reactor has mechanical defects or failures. By using the historical state data and the real-time vibration and noise signal data of the high-voltage shunt reactor, an LSTM neural network time series prediction method, as well as comparison of the deviation between the predicted characteristic value and the actual characteristic value, etc., the evaluation of the mechanical state of the high-voltage shunt reactor is realized.

Abstract: The present disclosure provides a protective method and system combining process monitoring and control in laser drilling. This method includes collecting signal evolution information, a current hole depth, and motion track information in a laser drilling process; performing a feature extraction on the signal to obtain sequential eigenvalues evolving over time, and constructing a prediction model of the penetration time based on the eigenvalues; combining the hole depth and motion track information with the eigenvalues to construct a drilling stage identification model; combining a prediction result of the prediction model of penetration time and identification confidence of the identification model at different moments to construct a state identification model; and judging a current drilling stage according to the model, controlling the processing process according to a judgment result, and using different drilling strategies at different drilling stages.

Abstract: The present disclosure discloses a two-point sampling optimized method and system for sinusoidal excitation-based frequency response measurement. A plurality of points are sampled at equal intervals within the starting frequency and ending frequency range as initial information, the interpolation error of each sub-frequency band is estimated according to existing sampling information, the sub-frequency band with the largest interpolation error is selected, two new sampling points are added within the sub-frequency band, and the above steps are repeated until the quantity of sampling points reaches the total quantity set by a user; and the user is asked whether new sampling points need to be added, if so, after the user specifies a new quantity of sampling points, the interpolation error of each sub-frequency band is estimated again and sampling continues, otherwise, the sampling ends. The present improves the practicality of a sinusoidal excitation-based frequency response measurement method.

Abstract: The present disclosure relates to the field of strain sensors, and specifically relates to a high-temperature thin-film strain sensor, including a substrate and a strain-sensitive grid. The strain-sensitive grid includes an indium tin oxide layer and a platinum layer, the indium tin oxide layer is deposited on the substrate, and the platinum layer is deposited on the indium tin oxide layer. The indium tin oxide layer contains 50% by mass of indium oxide and 50% by mass of tin oxide. The high-temperature thin-film strain sensor provided by the present disclosure can be used in an environment from room temperature to 500° C., and have extremely high sensitivity at a high temperature of 500° C. Unlike the conventional metal foil strain gauge with a thickness of several microns, the high-temperature thin-film strain grid has a thickness of 500 nm, which can better convey the strain of the measured object at high temperature.

Abstract: The present disclosure discloses a single-point sampling optimized method and system for frequency response measurement. The frequency response measurement based on sinusoidal excitation is regarded as frequency domain sampling of system under test, the interpolation error between piecewise linear interpolation model of existing sampling value and the theoretical model of the system under test is estimated, and a single newly added sampling point is placed in the sub-frequency band with maximum interpolation error, so as to achieve steepest descent of an overall interpolation error. The present disclosure does not rely on specific hardware, is directly embedded into existing frequency response analyzer, has high usability, high precision and high stability, and has good data inheritance.

Abstract: A nuclear reactor main heat and waste heat integrated thermal exchanger has a first coolant zone for a first main heat loop, a second coolant zone for a second main heat loop and a third coolant zone for a waste heat removal loop. The first coolant for the first main heat loop passes through the first coolant inlet, and then reaches the orifice plate, and finally flows out from the first coolant outlet. The second coolant for the second main heat loop passes through the second coolant inlet, and then reaches the lower tube sheet, and finally flows out from the second coolant outlet. The third coolant for the waste heat removal loop enters the entrance sleeve through the third coolant inlet, and then enters multiple tubes of the tube bundle, and then enters the exit sleeve, and finally flows out from the third coolant outlet.

Abstract: The present disclosure provides a two-stage co-liquefaction mixing-reaction-filtration-heat recovery integrated apparatus, realizing the implementation of a two-stage HTL process; secondly, a nozzle, a receiving chamber, a mixing chamber and a diffusion chamber are disposed at different material feed ports and medium feed ports, and high-speed fluids are fully collided and mixed in these structures; heat of HTL in a first stage is from heat of an HTL product in a second stage, which achieves the recycling of the heat of the HTL product in the second stage, improving economic efficiency; in a first-stage HTL process, through the setting of high-temperature and high-pressure needle valves, so that different first-stage HTL reaction times are selected for different material characteristics; and each first-stage HTL reaction tube is provided with an inclination of 1-3°, and a second-stage HTL generation chamber is provided with a residue scraping device and a salt scraping device.