775results about How to "Performance is not affected" patented technology

The invention discloses a data storage system of a digital country based on cloud computing, which comprises a client, a data transmission module and a cloud computing center, relates to the technical field of data storage, stores hot data on a high-performance hot data storage layer, ensures that frequently accessed data can be quickly responded, improves the system performance, and at the same time, stores the hot data on a high-performance hot data storage layer. The cold data is stored in a low-performance cold data storage layer, the storage cost is reduced, effective balance of performance and cost is achieved, the data is automatically migrated among different storage layers along with change of data access frequency, so that the performance and the cost are balanced, the frequently accessed data is migrated into a cache, the access speed of the data is increased, and the data access efficiency is improved. And establishing a relationship between a time interval and a data type of historical data, predicting data which are possibly accessed in a given time interval, adding the data into the cache, dynamically adjusting the cache, and ensuring the validity of the cache.

The embodiment of the invention discloses a database migration method and device for a heterogeneous database and a medium, and relates to the technical field of database migration, the method comprises the steps that database migration demand information is acquired, and the database migration demand information comprises current service information, target migration database information and source database information; automatically migrating the data table structure and the business data according to the database migration demand information, extracting SQL statements based on the source database information, and determining a plurality of original SQL statements of the source database; based on the target migration database information, determining current statement rule information, performing rule matching check on the original SQL statement according to the current statement rule information, determining a plurality of risk SQL statements, and generating a migration compatibility evaluation set; and generating a migration compatibility optimization reference file through the migration compatibility evaluation set, and realizing database migration of the source database and the target migration database based on the migration compatibility optimization reference file.

The invention discloses an ultrahigh-barrier homogenized composite packaging film and a preparation process thereof, and belongs to the technical field of packaging materials. The ultrahigh-barrier homogenized composite packaging film comprises a base material layer, an ink layer, a barrier layer and a heat sealing layer, wherein the base material layer is a BOPP film, the ink layer is water-based ink, the barrier layer is a VMBOPP film, and the heat sealing layer is a PE composite film; the BOPP film is prepared from the following raw materials in parts by mass: 60 to 70 parts of polypropylene, 15 to 22 parts of hyperbranched polymer modified POE (Polyolefin Elastomer), 10 to 18 parts of ethylene-vinyl acetate copolymer, 0.1 to 0.5 part of nucleating agent and 0.1 to 0.4 part of antioxidant. The ultrahigh-barrier homogenized composite packaging film disclosed by the invention is simple in preparation process and stable in structural barrier property, has ultrahigh oxygen barrier property and water vapor barrier property and excellent mechanical strength, toughness and high and low temperature resistance, a heat sealing process is easy to control, and the edge sealing flatness after packaging is improved; the single polyolefin material is adopted, the raw materials are environment-friendly, the barrier property of the same structure of an aluminum foil can be obtained, and the cost is reduced.

The invention discloses an anti-blocking agent and a preparation method and application thereof, and belongs to the technical field of chemical fertilizer assistants, and the anti-blocking agent comprises at least one of a surfactant capable of controlling the length of hydrophilic and hydrophobic chain segments, a macromolecular surfactant and inert powder. Wherein the surfactant capable of controlling the length of the hydrophilic and hydrophobic chain segment comprises at least one of fatty alcohol-polyoxyethylene ether, fatty acid methyl ester polyoxyethylene ether, fatty amine polyoxyethylene ether, fatty acid amide and fatty glyceride. The anti-blocking agent is prepared in a blending mode, the anti-blocking agent is directly put into the liquid raw materials of the fertilizer to be evenly mixed, through the spray drying technology, moisture is completely evaporated, main components of the anti-blocking agent are firmly attached to the surfaces of powder fertilizer particles, the raw materials are easy to obtain, preparation is convenient, and the anti-blocking agent has the advantages of being high in anti-blocking efficiency, convenient to use and the like.

The invention discloses a single-line return-to-zero code LED drive control chip circuit which comprises a power management circuit, a start reset circuit, an oscillator circuit, a bias current circuit, a digital circuit and a light emitting diode drive circuit. The light emitting diode driving circuit comprises a driving channel of a white light emitting diode chip, a driving channel of a red light emitting diode chip, a driving channel of a green light emitting diode chip and a driving channel of a blue light emitting diode chip, and the power management circuit is used for ensuring that the power supply is turned off when all-zero data or no data is input by analyzing the states of the previous data and the next data in the power management signal. The single-line return-to-zero code LED driving control chip solves the problems that the current single-line return-to-zero code LED driving control chip with a three-channel design does not have a sleep mode, so that effective power consumption management is lacked when the brightness and the color of an LED are controlled, and the whole LED device still has static power consumption waste in a non-light-emitting state.

The invention belongs to the technical field of cable manufacturing, and discloses a large-section cable for vehicle end bridging, which sequentially comprises a conductor layer, an insulating layer, a shielding layer and a sheath layer from inside to outside, the shielding layer comprises a forward winding type braided shielding wire and a reverse winding type meta-position aramid fiber, the braided shielding wire is formed by twisting a plurality of strands of metal alloy, and the sheath layer is arranged between the conductor layer and the insulating layer. The meta-position aramid fiber adopts stranded meta-position aramid fiber filaments as reverse winding weaving filaments, the sheath layer adopts high-temperature hot drying tunnel vulcanization extrusion type silicone rubber, the temperature of a high-temperature section of a drying tunnel is not lower than 400 DEG C, the vulcanization time is not less than 1 minute, and the meta-position aramid fiber is embrittled and cracked until carbonization failure due to the high temperature of the high-temperature section of the drying tunnel. The cable is suitable for production of a winding shielding layer of a large-section cable for vehicle end bridging with silicone rubber as an insulating layer and a sheath layer, and through introduction of reverse winding meta-position aramid fibers, on the basis of not influencing the use of the whole product, the product structure is further stabilized, and the use stability and safety of the product are ensured.

The invention relates to the technical field of denitration, and discloses a cerium-based catalyst, a preparation method thereof and application of the cerium-based catalyst in catalytic oxidation of nitric oxide. The cerium-based catalyst contains CeO2 and a transition metal oxide, and the transition metal oxide is selected from at least one of an oxide of Mn, an oxide of Co, an oxide of Ni and an oxide of Cu; on the basis of the total weight of the cerium-based catalyst, the mass content of the transition metal oxide is 0.5-20%. The cerium-based catalyst provided by the invention is prepared by taking rare earth oxide CeO2 as a unique or main catalyst carrier and adding a small amount of specific transition metal oxide. Compared with a traditional catalyst, the cerium-based catalyst has the advantages that the catalytic activity is obviously improved, and high-temperature pretreatment hardly affects the performance of the catalyst and even has a positive effect.

The invention discloses a quaternized chitosan benzisothiazolinone derivative as well as a preparation method and application of the quaternized chitosan benzisothiazolinone derivative in efficient antibacterial performance. The derivative has a structure as shown in a formula 1. The preparation method comprises the following steps: reacting chitosan with glycidyl trimethyl ammonium chloride at 60-100 DEG C for 6-48 hours to obtain a product 1, namely hydroxypropyl trimethyl ammonium chloride chitosan (HACC); the preparation method comprises the following steps: reacting 1, 2-benzisothiazolin-3-one with sodium chloroacetate at the temperature of 110-140 DEG C for 12-36 hours to obtain a product 2: 2-(3-carbonyl benzo [d] isothiazole-2-(3H)-yl) acetic acid (BITCOOH); and reacting the product 1 with the product 2 under a neutral condition for 12-48 hours to obtain the quaternized chitosan benzisothiazolinone derivative (HACCBIT). The derivative has a broad-spectrum antibacterial property, and has a killing effect on a plurality of bacteria, such as staphylococcus aureus, escherichia coli, salmonella salmonella salmonella, lactobacillus paracasei, lysinibacillus sphaericus, acinetobacter lwoffii and the like, and the derivative can be used for killing a plurality of bacteria, such as the staphylococcus aureus, the escherichia coli, the salmonella salmonella salmonella, the lactobacillus paracasei, the lysinibacillus sphaericus, the acinetobacter lwoffii and the like.

The invention discloses a predictive maintenance method and system for network equipment, and relates to the technical field of cloud computing networks. Comprising the steps of 1, collecting data of network equipment in real time, 2, preprocessing the data of the network equipment, 3, analyzing the preprocessed data, and constructing a prediction model: constructing a machine learning model, predicting the data, and predicting and processing time sequence data by using a deep learning model in combination with a long short-term memory (LSTM) network and a convolutional neural network (CNN); 4, testing and optimizing the prediction model: testing the prediction model in a controlled environment, and optimizing the model according to feedback; and 5, deploying the prediction model in the production environment, and monitoring the performance and accuracy of the prediction model.

The invention discloses a fluorine oil cleaning method and device for precision electronics, and relates to the field related to intelligent cleaning.The method comprises the steps that target component characteristics are collected to determine target fluorine oil, and first cleaning control data of soaking and cleaning a target precision electronic component through the target fluorine oil are obtained, analyzing the first cleaning control data through a soak cleaning evaluation model, obtaining a first soak cleaning cleanliness index as an analogy screening constraint, screening historical fluorine oil cleaning records to obtain a target historical record, and introducing a cleaning fitness function as an optimization evaluation function, and taking the target historical record as an optimization space to obtain second cleaning control data to perform ultrasonic cleaning on the target precision electronic component. The technical problem that the cleaning effect is poor due to the fact that tiny stains or residues on the surfaces of precision electronic parts cannot be thoroughly removed through a traditional precision electronic cleaning mode is solved, and the technical effects that dirt on the surfaces of the precision electronic parts is effectively removed, and the performance of the parts is not affected by cleaning are achieved.

The invention relates to the technical field of high-molecular compounds, in particular to a diamine monomer, self-repairing thermoplastic polyimide resin and a preparation method. The molecular structural formula of the diamine monomer is # imgabs0 #, in the formula, Y is one of N atoms or O atoms, and m is any integer between 1 and 5. The self-repairing thermoplastic polyimide resin prepared from the diamine monomer has a dynamic disulfide bond cross-linked structure, and compared with a structure containing a disulfide bond in a polyimide main chain, the polyimide resin has higher structural strength and better performance after being repaired; the technical problems that an existing polyimide material is poor in material self-repairing capacity and poor in mechanical property can be effectively solved.

The utility model relates to the technical field of computer equipment, in particular to a video card wireless device, which comprises a heat dissipation module with a heat conduction frame; the main PCB and the power supply PCB are installed below the heat conduction frame, and the power supply PCB is electrically connected with the main PCB; wherein a plurality of floating structures are distributed between the power supply PCB and the heat conduction frame, the power supply PCB is connected and fixed with the heat conduction frame through the floating structures, and the floating structures are adopted, so that the power supply PCB can shift left and right to eliminate the tolerance of each part in processing and assembling; meanwhile, the alignment error with the PCIE card slot of the mainboard can be adapted in a small range so as to optimize the assembly convenience, the main back plate and the auxiliary back plate both adopt a detachable structural design, and the two back plates are independently detachable without influencing the performance of the heat dissipation module, so that the convenience of internal maintenance and dust removal of the display card is improved, and the convenience of after-sales maintenance is improved.

The embodiment of the invention discloses a low-corrosion metal system for capturing CO2 through an electrochemical mediation amine regeneration method and a preparation method of the low-corrosion metal system. The method comprises the steps that metal copper Cu serves as an electrode, and an organic amine MMEA aqueous solution doped with non-corrosion sodium salt serves as an absorbent; the absorbent saturated by CO2 absorption is used as anode liquor; and a solution obtained after a Cu-MMEA complex is fully formed in the anolyte serves as catholyte, and the Cu-MMEA metal system is prepared. According to the preparation method of the low-corrosion metal system for capturing CO2 through the electrochemical mediation amine regeneration method, the non-corrosion salt is introduced into the cathode electrolyte and the anode electrolyte, so that the problem that a chlorine-containing solution and a nitrate-containing solution corrode stainless steel in long-term use is solved, and the performance is not affected.

The invention discloses a PTC heating assembly and an electric heating device, and according to the technical scheme of the invention, a plurality of PTC heating elements in the PTC heating assembly are arranged in parallel in the same arrangement plane, so that the use and heating effects of the PTC heating elements are not affected, and the heating efficiency of the PTC heating elements is improved. By horizontally placing each PTC heating element, the overall thickness of the PTC heating device is reduced, and the heat transfer efficiency of the PTC heating device is improved. The flow inlet and the flow outlet in the electric heating device can be formed in the first heat exchanger and the second heat exchanger correspondingly and can also be formed in the first heat exchanger in a centralized mode, so that the flow inlet and the flow outlet can form various external connection modes in the direction, and the electric heating device can adapt to various installation environments.

The utility model provides a pole, a top cover assembly, a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries, the pole comprises at least one first connecting part and at least two second connecting parts, along a second direction, the first connecting part has a third surface; the at least two second connecting parts are used for being connected with the tabs, each second connecting part comprises a main body part and a first flanging part, each first flanging part is connected to one end face, in the second direction, of the corresponding main body part and extends towards the corresponding first connecting part, each first flanging part is connected with the corresponding first connecting part, and each first flanging part is provided with a fourth face in the second direction; and the fourth surface and the third surface are positioned on the same side in the height direction of the post terminal, are positioned on the same plane and form a second surface. Therefore, the processing of the pole is more convenient, and the size of the pole in the width direction can be reduced.

The invention discloses a quartz fiber with an yttrium oxide coating and a preparation method of the quartz fiber, and belongs to the field of preparation of wave-transparent ceramics. Aiming at the problem that the performance of the existing quartz fiber is reduced at a high temperature, the invention provides the preparation method of the quartz fiber with the yttrium oxide coating, which comprises the following steps: impregnating the quartz fiber by using yttrium oxide sol, and drying and sintering the impregnated quartz fiber to obtain the quartz fiber coated with the yttrium oxide coating on the surface; the preparation process of the yttrium oxide sol comprises the following steps: sequentially adding a coordination agent and a stabilizer into a yttrium nitrate solution, stirring and dissolving to form a mixed solution, adding a pH regulator to adjust the pH value of the mixed solution to 7-8, heating to a target temperature, and cooling to obtain the yttrium oxide sol. The yttrium oxide coating covers the surface of the quartz fiber, so that the high-temperature sintering resistance of the quartz fiber can be greatly improved; the preparation process of the yttrium oxide sol is simple in technology and low in cost, the prepared yttrium oxide sol is good in stability and can be better attached to the surface of the quartz fiber, and the dipping effect is improved.

The utility model discloses an anti-puncture rubber tire, which comprises a main tire and an outer-layer rubber tread, the outer-layer rubber tread is positioned on the periphery of the main tire, the main tire is connected with the outer-layer rubber tread through a plurality of groups of spokes, the main tire comprises a tread part, an inner layer is arranged on the inner side surface of the tread part, and an outer layer is arranged on the outer side surface of the tread part. A sealant layer is filled between the inner layer and the inner side surface of the tread part, and the inner layer comprises a dividing strip assembly; the outer-layer rubber tread is in contact with the ground, and a gap formed by the avoiding cavity is formed between the outer-layer rubber tread and the main tire, so that a sharp object is blocked by the outer-layer rubber tread when being punctured into the outer-layer rubber tread and is not easy to puncture into the tread part of the main tire, and the puncture prevention of the main tire is realized; the self-repairing of the tire is realized by the sealant layer depending on the viscosity of the sealant layer; and the sealant layers are filled in the multiple groups of separation cavities in a split manner, so that the influence of the mobility of the sealant layers on the dynamic balance of the tire is reduced.

The invention belongs to the technical field of hydrogen production electrolytic cells, and particularly relates to a preparation method of an electrode for a hydrogen production electrolytic cell, and the preparation method at least comprises the following steps: providing a base material; forming a first catalyst layer on the substrate; and forming a second catalyst layer on the first catalyst layer, when the second catalyst layer is formed, a stabilizer is added into the electrochemical liquid medicine, and the stabilizer comprises one or a combination of more of sodium citrate, potassium citrate, sodium gluconate, disodium ethylene diamine tetraacetate and sodium tartrate. By means of the preparation method of the electrode for the hydrogen production electrolytic cell, the stability of the catalyst on the base material can be improved, exertion of the activity of the catalyst is not affected, then the performance of the water electrolysis hydrogen production electrode is improved, the preparation cost can be reduced, and the preparation process can be simplified.

The plate heat exchanger convenient to clean comprises a fixed clamping plate, a movable clamping plate and a supporting frame, two supporting feet are fixedly installed at the bottom of the fixed clamping plate, the fixed clamping plate is fixedly installed at one end of the supporting frame, and a plurality of heat dissipation plate sheets are fixedly installed between the fixed clamping plate and the movable clamping plate. Four flange plates are fixedly installed on the fixed clamping plate, a movable clamping plate is movably placed on the supporting frame, a plurality of installation holes are evenly formed in the outer wall of the movable clamping plate and the outer wall of the fixed clamping plate, supporting rods are fixedly placed in the installation holes, and the other ends of the supporting rods are connected with fixing nuts in a screwed mode. The heat dissipation device is simple in structure and convenient to use, the stability of the heat dissipation device is conveniently improved through the arrangement of the base and the supporting legs, meanwhile, the two fixing rods arranged in parallel are fixedly installed on the supporting frame, the movable clamping plates and the heat dissipation plate pieces are movably installed on the fixing rods, and therefore the disassembly and assembly speed of the heat dissipation plate pieces is further increased.

The invention discloses radiation refrigeration nanocellulose aerogel and a preparation method thereof, and belongs to the technical field of aerogel materials.The preparation method comprises the steps that polyvinyl alcohol, nanocellulose and / or borax serve as raw materials, N, N '-methylenebisacrylamide and methyl-trimethoxysilane are added, composite wet gel is obtained, the composite wet gel is directionally frozen, and the radiation refrigeration nanocellulose aerogel is prepared. The lowest heat conductivity coefficient of the radiation refrigeration nanocellulose aerogel can reach 34.56 mW.m <-1 >. K <-1 >, the highest compressive strength can reach 291 Kpa, and the highest cooling temperature can reach 15 DEG C. The aerogel is expected to be applied to the related fields of cold-chain logistics packaging, building energy conservation and the like.

The utility model discloses an anti-mistaken-touch power capacitor, comprising an anti-mistaken-touch mechanism, the anti-mistaken-touch mechanism is installed outside a button, the anti-mistaken-touch mechanism comprises a protective cylinder, the protective cylinder is fixed on a capacitor body and is located at the periphery of the button; the cover cap is movably mounted in the protective cylinder, and the cover cap is matched with the button; telescopic grooves are evenly and longitudinally formed in the inner wall of the protection cylinder, elastic telescopic pieces are installed in the telescopic grooves, pressing plates are evenly arranged on the periphery of the cover cap, and the pressing plates can slide into the telescopic grooves. And rotating grooves are evenly and transversely formed in the inner wall of the protection cylinder and communicate with the tops of the telescopic grooves, and the pressing plates can rotate into the rotating grooves. The cap can move up and down, so that the button can be conveniently pressed while the button is prevented from being touched by mistake; in addition, after the cap is rotated, the pressing plate enters the rotating groove, so that the cap is limited in the longitudinal direction and cannot move, and the purpose of preventing the button from being touched by mistake is further achieved.

The invention relates to the technical field of pelvic floor magnet therapy, and discloses a pelvic floor magnet therapy device which comprises a hollow magnet therapy coil and further comprises a magnetic induction box with a top cover with ventilation holes. One end of each movable enclasping support is fixed on the lateral inner wall of the magnetic induction box, and the other end of each movable enclasping support is an arc-shaped positioning surface close to the hollow magnetic therapy coil; the at least one heat insulation pad is configured between the bottom of the magnetic induction box and the hollow magnetic therapy coil; wherein the hollow magnetic therapy coil is movably arranged on the heat insulation pad and is also positioned in the arc-shaped positioning surface of the movable holding support. According to the pelvic floor magnetic therapy device, the installation performance and the easy maintenance performance of the hollow magnetic therapy coil are improved, the overall heat dissipation performance of the device is enhanced, noise is reduced, the magnetic gathering effect is enhanced, the performance of the pelvic floor magnetic therapy device is not affected even if a patient can take the pelvic floor magnetic therapy device for a long time, the use comfort performance of the pelvic floor magnetic therapy device is improved, and the service life of the pelvic floor magnetic therapy device is prolonged.

The present invention discloses a diffraction optical waveguide device capable of eliminating the rainbow effect, comprising an optical engine, an in-coupling grating, a waveguide component, an adjusting mechanism and an out-coupling grating, wherein the in-coupling grating, the adjusting mechanism and the out-coupling grating are all arranged in affixed with the waveguide component, wherein: the in-coupling grating is used to couple the light emitted by the optical engine into the waveguide component; the adjusting mechanism is a volume Bragg grating, and is arranged relative to the out-coupling grating, and is used to reflect the light within a preset angle range in the external ambient light, so that the external ambient light entering the waveguide component appears as zero-order diffraction light after passing through the out-coupling grating, so as to eliminate the rainbow effect; the out-coupling grating is used to couple the light conducted by the waveguide component to the human eye. The device can not only ensure the brightness of the ambient light in the user's field of view, but also eliminate the rainbow effect, ensure the uniformity and brightness of the out-coupling image, and provide a better experience for the user.

The invention relates to the technical field of household appliances, in particular to a heat dissipation control method and device of an electric control mainboard, the electric control mainboard and a storage medium. According to the invention, when the electric control main board has the power output requirement, the current temperature difference value is calculated according to the current working temperature and the theoretical working temperature of the electric control main board so as to measure the power requirement of the electric control main board; and the current temperature difference value and the historical temperature difference value are comprehensively considered through a preset power control model to adjust the operation power of the electric control mainboard, so that the output power of the electric control mainboard is reduced on the premise that the performance of the electric control mainboard is not affected, heat generated by the mainboard due to overlarge output power is reduced, and the service life of the mainboard is prolonged. The technical problems that in the prior art, a circuit board is poor in heat dissipation capacity during working, and potential safety hazards exist are solved, and meanwhile the working performance of the electric control mainboard is guaranteed.

The invention belongs to the field of devices for high-power fiber lasers, particularly relates to a long-period fiber grating capable of dynamically suppressing stimulated Raman scattering of different wavelengths and a suppression method, and aims to solve the problem that the stimulated Raman scattering effect under different wavelengths cannot be dynamically adapted and suppressed. A pumping source is connected with one end of a beam combiner, the other end of the beam combiner is connected with one end of a resonant cavity, the other end of the resonant cavity is connected with one end of a long-period fiber bragg grating, the other end of the long-period fiber bragg grating is connected with one end of a stripper, the other end of the stripper is connected with an output end, and the output end is connected with a spectrograph. Wherein the resonant cavity is used for oscillating and amplifying spontaneous radiation light with a set wavelength; the two ends of the long-period fiber grating are fixed to the stress field applying device, and the long-period fiber grating is arranged in the temperature field applying device. According to the invention, stimulated Raman scattering of different wavelengths is effectively inhibited, the output power, the beam quality and the system stability of the laser are improved, and the service life is prolonged.

The invention belongs to the technical field of costume design, and discloses a drawstring backpack storage type down jacket which comprises a down jacket body and a storage bag, and the storage bag comprises a bag body, a drawstring strap, a connecting piece and a first fixing piece; the drawstring knapsack storage type down jacket has the dual functions of a knapsack and loading and transporting objects, and the storage space is sufficient; when the down jacket needs to be changed into a knapsack, the down jacket can be stored in the bag body by turning the storage bag outwards; when the down jacket needs to be worn, the down jacket can be unfolded for wearing only by stretching the drawing and closing opening and folding the down jacket out of the bag body, so that the conversion process between the backpack and the down jacket is simple and efficient, and the operation of a wearer is facilitated; the characteristic that the inner side face of the down jacket is large in space is fully utilized, so that the storage bag can store the down jacket body and can also bear other articles. Meanwhile, the bag body is connected to the inner side face of the down jacket, the appearance is kept simple, the bag body can still keep attractive, fashionable and practical functions of the knapsack after being turned outwards, and flexibility is high.

The invention belongs to the field of industrial waste resource comprehensive utilization, and particularly relates to a green environment-friendly fly ash multi-effect exciting agent and a preparation and use method thereof. The fly ash multi-effect exciting agent prepared by the invention is prepared by fully and uniformly mixing a composite active exciting agent, a quick-setting early strength agent, a modifier and a composite efficient ammonia fixing agent, and the fly ash multi-effect exciting agent is prepared from the following raw materials in parts by weight: 60-90% of the composite active exciting agent, 1-12% of the quick-setting early strength agent, 1-5% of the modifier and 5-30% of the composite efficient ammonia fixing agent, the fly ash multi-effect exciting agent can be specifically used in mine filling mining and concrete admixtures, can effectively excite the potential activity of fly ash and remarkably improve the utilization rate of fly ash, can solidify ammonia in fly ash, effectively solves the problem of pungent smell generated during fly ash filling, and has a wide application prospect.

The invention belongs to the technical field of vehicle-mounted camera recording, and particularly relates to a multi-camera background recording method and system based on an Android 13 vehicle-mounted system, and the method comprises the steps: initializing camera management; periodically detecting the connection state of the camera, and when it is detected that at least one camera is connected, displaying real-time video preview of the connected camera on a user interface of the vehicle-mounted system; in response to user operation or vehicle-mounted system triggering, starting a background recording function of at least one camera; when the user exits from the preview interface or the vehicle-mounted system is switched to background operation, continuous operation of the background recording function is kept; when the user enters the preview interface again, real-time video preview of the camera is restored and displayed, and time information of continuous recording is displayed; and in response to the user operation, stopping the background recording function of the camera, and storing the recorded content to the external storage device. According to the invention, simultaneous preview and recording of multiple cameras can be realized.

The invention relates to a method for forming a semiconductor structure, which comprises the following steps of: providing a substrate which comprises an NMOS (N-channel Metal Oxide Semiconductor) region and a PMOS (P-channel Metal Oxide Semiconductor) region, and respectively arranging a gate layer and a source-drain region formed in the substrate at two sides of the gate layer on the surface of the substrate in the NMOS region and the PMOS region; stress layers are formed on the surface of the substrate and the side wall and the top surface of the gate layer; carrying out stress relief treatment on the stress layer of the PMOS region; carrying out annealing treatment on the stress layer of the NMOS region; patterning the stress layer after the stress relief treatment and the annealing treatment until the top surface of the gate layer and the top surface of the source-drain region are exposed; forming metal silicide on the exposed top surface of the gate layer and the exposed top surface of the source and drain region; therefore, the cost can be saved, the manufacturing time can be shortened, the performance of the formed semiconductor structure is not influenced, and the method has a wide application range.