5234 results about "Composite structure" patented technology

The invention discloses a composite structure damage form monitoring method and system based on deep learning, and the method comprises the following steps: collecting multi-source monitoring data of a composite structure in a loaded state, and carrying out the preprocessing; reconstructing a damage evolution trajectory in a high-dimensional phase space by adopting a delay coordinate embedding method, and executing dimension reduction to generate a chaotic dynamics low-dimensional trajectory; extracting singular attractor features, and generating a singular attractor feature set; carrying out sequence modeling through an improved Linformer damage identification network, and generating a prediction vector; training an improved Linformer damage identification network based on the prediction vector, and introducing nonlinear dynamic constraints to generate a damage identification network of the nonlinear dynamic constraints; and performing damage form classification and damage evolution prediction. According to the method, dynamics and deep learning are fused, composite structure damage monitoring is achieved, and the method has the advantages of being high in accuracy, high in stability and reliable in early warning.

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

The invention relates to the technical field of cables, and discloses an anti-torsional fatigue and corrosion-resistant wind power cable and a manufacturing process thereof, the anti-torsional fatigue and corrosion-resistant wind power cable comprises a three-phase cable core main body, a dynamic compensation anti-torsion layer, a multifunctional corrosion-resistant barrier layer and an outer sheath, the three-phase cable core main body comprises a stranded conductor, a filling inner layer and an insulating layer; the dynamic compensation anti-torsion layer comprises an incongruous spiral supporting layer and a shape memory alloy compensation layer, and the incongruous spiral supporting layer comprises aramid fiber bundles and a nickel-cobalt alloy wire woven mesh; the multifunctional anti-corrosion barrier layer is arranged on the outer side of the dynamic compensation anti-torsion layer and sequentially comprises an anti-corrosion barrier bottom layer, an anti-corrosion barrier middle layer and an anti-corrosion barrier bottom layer surface layer from inside to outside. Through the gradient composite structure design, the problem of failure of a traditional wind power cable under long-term dynamic load and severe environment is effectively solved, and the torsional fatigue resistance, the corrosion resistance and the environmental adaptability are remarkably improved.

The invention discloses an underground chamber structure of a compressed air energy storage power station, a construction method and a parameter optimization design method, and belongs to the field of compressed air energy storage and underground space engineering. A hard rock stratum building chamber is determined through systematic site selection investigation, a high-performance concrete lining (containing fiber reinforcement) and a polyurethane buffer layer are adopted to synergistically improve the stability, and a vinyl ester resin-based glass fiber reinforced plastic three-layer composite structure serves as a sealing layer (including a bonding layer, a reinforcement layer and an impermeable layer); the processes of sand blasting pretreatment, stepped joint and the like are combined to guarantee the sealing performance; meanwhile, on the basis of a finite element model, structural parameters are optimized by taking the lowest whole life cycle cost as a target and taking strength, deformation, leakage rate and the like as constraints, and a recommended parameter combination of each structural layer is obtained in combination with an orthogonal experimental design and an improved genetic algorithm. The method is suitable for various geological conditions, the safety, economical efficiency and adaptability of the compressed air energy storage power station are effectively improved, and the method is suitable for large-scale application and popularization.

The invention discloses a solid electrolyte, a preparation method thereof and an all-solid-state battery, and belongs to the technical field of solid electrolytes. According to the preparation method, a nano inert oxide and a solid electrolyte raw material are compounded through mechanical grinding, and the solid electrolyte with a core-shell structure is prepared; the device comprises an inner core, an interface layer and a shell from inside to outside, the inner core is a solid electrolyte matrix, the interface layer is a transition layer generated by reaction of the solid electrolyte matrix and a nano inert oxide, and the shell is a nano inert oxide layer. The material combines the advantages of high moisture resistance and wide electrochemical window of the nano inert oxide and the characteristics of high ionic conductivity and excellent mechanical property of the solid electrolyte, and the comprehensive performance of the material is remarkably improved through the synergistic effect of the components. The composite structure design not only solves the problem of performance limitation of a single material system, but also realizes collaborative optimization of ionic conductivity, environmental adaptability and electrochemical stability while ensuring the material stability.

The invention relates to the technical field of cables, in particular to a charging pile cable with an elastic stress buffer section composite structure, which comprises a plurality of cable cores distributed in the circumferential direction, an insulation shielding layer and a supporting structure, the supporting structure comprises a plurality of supporting frameworks which are fixedly connected with the exteriors of the plurality of insulation shielding layers and are distributed at equal intervals in the front-back direction, an elastic rubber pad is fixedly connected between every two adjacent supporting frameworks in the front-back direction, and the exteriors of the plurality of supporting frameworks and the elastic rubber pads are jointly wrapped with a water-blocking wrapping tape. The supporting skeletons are used for rigidly supporting the plurality of cable cores, the cable cores can be prevented from being damaged due to excessive extrusion force, the elastic rubber pads between the two adjacent supporting skeletons can perform telescopic deformation to a certain extent, the cable can be conveniently bent, and the flexibility of the cable during bending is improved while the supporting strength of the cable is ensured.

The invention discloses a composite sulfide solid-state electrolyte and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The composite sulfide solid electrolyte comprises sulfide solid electrolyte particles and nano ion conductor particles which are stable to water vapor, wherein the nano ion conductor particles are uniformly distributed on the surfaces and gaps of the sulfide solid electrolyte particles to form a composite structure. Therefore, through the composite structure that the nano ion conductor particles are uniformly distributed on the surfaces of the sulfide particles and in the gaps, the surface coverage of the sulfide solid electrolyte can be increased, the hydrolysis reaction rate can be reduced, and the sulfide solid electrolyte is well protected while the reduction amplitude of the lithium ion conductivity is reduced; the stability to air is improved; and the electrochemical stability is also improved. In addition, the method is simple in process, has good mass production capacity, and has high application value for actual production.

The invention discloses a composite material stress distribution analysis method and system and a storage medium. The method comprises the following steps: acquiring a defect detection image obtained by computed tomography or infrared thermal imaging; identifying a defect area in the composite material structure and extracting defect information; according to the defect information and the loading direction, calculating a defect-induced stress enhancement factor and a stress transfer function, and constructing a stress correction factor distribution diagram; establishing a reference finite element model ignoring defects, and calculating a reference stress distribution field; acting the correction factor distribution diagram on the reference stress field to generate a correction stress distribution diagram; combining defect identification errors and material statistical fluctuation to construct an uncertainty propagation model, quantifying the corrected stress diagram, and outputting a stress value interval map; and finally, jointly correcting the stress map and the interval map, and identifying a high-risk area.

The invention relates to a damage assessment method and device for a composite material structure and electronic equipment, and relates to the technical field of aircraft maintenance, and the method comprises the steps: obtaining an aircraft typical structure operation and maintenance database and an actual service environment database; extracting structure damage characteristics from the aircraft typical structure operation and maintenance database, and extracting service environment factor data of the aircraft from the actual service environment database; performing clustering analysis on the extracted service environment factor data to obtain a clustering analysis result, and performing correlation analysis on the extracted structure damage features and the clustering analysis result to obtain a correlation analysis result; and based on the correlation analysis result, constructing an evaluation index system, and performing damage evaluation on the composite material structure of the aircraft by using the evaluation index system. According to the scheme, various environmental factors and structural damage characteristics can be comprehensively considered, the service reliability and safety of the structure are evaluated more accurately, a more reliable basis is provided for structure maintenance decision, and potential risks for flight safety are reduced.

The invention discloses a laser-assisted helium arc penetration fusion welding method, and belongs to the technical field of welding. The problems that according to an existing paraxial laser-electric arc composite structure, the welding track is difficult to control, the energy coupling efficiency is low due to laser energy loss, and weld joint partial melting and undercut defects are caused due to uneven distribution of a welding temperature field due to a generated asymmetric heat source are solved. The welding method comprises the steps of 1, pretreatment; 2, after being focused by a focus lens, the laser is divided into three laser beams through a spectroscope, then the three laser beams are converged again through a plurality of reflectors, three fan-shaped light spots are formed on the surface of the to-be-welded plate after convergence, and finally the focal plane position of the laser is adjusted to be located on the surface of the to-be-welded plate; 3, setting welding current and arc voltage; and fourthly, laser is used for assisting helium arc penetration fusion welding. The method is used for laser-assisted helium arc penetration fusion welding.

The invention relates to the technical field of feed processing equipment, and discloses an efficient feed mixing stirrer which comprises a machine body, a main stirring assembly, an auxiliary stirring assembly, a driving mechanism, a feeding mechanism, a discharging mechanism and a control system.The machine body is of a horizontal cylindrical structure, and the main stirring assembly is arranged in the center of the interior of the machine body in the axial direction of the machine body; the auxiliary stirring assembly comprises a side wall auxiliary assembly and a bottom auxiliary assembly, and the driving mechanism is in power connection with the main stirring shaft, the side wall auxiliary assembly and the bottom auxiliary assembly through the transmission assembly and provides power for all the assemblies. Through a synergistic stirring structure of the main stirring assembly, the side wall and the bottom auxiliary assembly, a paddle and spiral composite structure of the main stirring assembly pushes materials to realize composite motion in the axial direction and the circumferential direction, stirring teeth of the side wall auxiliary assembly break a material circulation layer, and a scraping plate of the bottom auxiliary assembly prevents deposition of the materials with high density; the three synergistically enable the feed to be uniformly mixed.

The invention discloses a parallel simulation method for guided wave focusing imaging of a piezoelectric array of a composite structure, belongs to the technical field of nondestructive testing, and aims at solving the problems that the sound field control precision of a current multi-array-element piezoelectric structure in a composite material plate is insufficient, and a traditional finite element method is large in calculation time consumption, low in convergence speed and high in reliability in the guided wave propagation simulation process. In order to solve the problem that effective convergence cannot be realized under the excitation condition of a high-frequency multi-channel array and even under the excitation condition of a high-frequency multi-channel array, the invention provides an efficient guided wave focusing simulation strategy combining spectral element high-order precision and GPU parallel computing, and the method comprises the following steps: establishing a system control equation considering a piezoelectric-structure coupling effect on the basis of a delay superposition principle; energy focusing and sidelobe suppression of a guided wave signal in a specific direction are realized by adjusting spatial arrangement and excitation time sequence of a piezoelectric array sensor, Gauss-Labatto-Legendre integral nodes are introduced to construct a high-order spectral element unit, unit-level parallel solution is realized under a CUDA architecture, and dynamic simulation capability and overall calculation efficiency of focusing field distribution are remarkably improved.

The invention belongs to the technical field of composite materials, and discloses a basalt-based composite nanomaterial as well as a preparation method and application thereof. According to the invention, ZIF-67 in MOF is innovatively loaded on basalt nanosheets, so that not only can the dispersity and interfacial compatibility of basalt be improved and the sheet layers be prevented from being agglomerated in the coating, but also micropores possibly existing among the nanosheets can be blocked through a porous structure of the basalt, and the shielding effect and the penetration resistance of the whole coating are improved. In addition, the introduction of ZIF-67 endows the composite material with more functional regulation and control possibilities, such as ion capture, intelligent slow release and the like, so that the protection performance of the coating in a complex environment is further enhanced. Compared with a traditional filler, the composite structure has the advantages of being controllable in cost, excellent in performance, environmentally friendly and the like, and a new thought is provided for functional design of a water-borne epoxy resin anticorrosive coating.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a graded ordered silicon-carbon negative electrode material for a lithium ion battery, which comprises the following steps: (S1) mixing phenolic resin and a template agent, calcining, and etching to obtain porous carbon containing macropores; (S2) carrying out cracking and carbon coating on the silicon source gas to obtain nano crystalline silicon containing a carbon coating layer; (S3) mixing the porous carbon with the nano crystalline silicon containing the carbon coating layer, and then carrying out ultrasonic vibration, so that macropores of the porous carbon are filled with the nano crystalline silicon to obtain a silicon-carbon composite material I; (S4) treating the silicon-carbon composite material I by using a carbon-containing sealing agent, and then activating to obtain a silicon-carbon composite material II; and (S5) carrying out vapor phase silicon deposition on the silicon-carbon composite material II to fill the amorphous silicon in the pores of the porous carbon, and then carrying out carbon coating to obtain the graded ordered silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is of a composite structure in which crystalline silicon and amorphous silicon are spatially and orderly distributed, so that the structural stability and the uniform distribution of silicon are realized.

The application provides a composite structure, a shell and an electronic device, the composite structure can be applied to the shell or the electronic device, the composite structure comprises at least one first fiber prepreg, the first fiber prepreg comprises a fiber sheet and a resin wrapping the fiber sheet; the fiber sheet comprises a fiber cloth and a plurality of plating layers on the surface of the fiber cloth, the difference between the refractive indexes of two adjacent plating layers in the plurality of plating layers is greater than or equal to 0.4. In the composite structure provided by the application, the difference in brightness is formed by the difference in refractive indexes between adjacent plating layers, and the appearance of the fiber composite when applied to the shell and the electronic device is improved.

The invention provides an anti-static knitted fabric based on charge gathering and directional guiding, a preparation method of the anti-static knitted fabric and a knitted fabric, and belongs to the technical field of knitted clothes. A first spinning component and a second spinning component are co-extruded through melt spinning to prepare composite fibers with a parallel composite structure, and the composite fibers are subjected to thermal mechanical treatment to obtain the composite yarn; the composite yarn is directionally introduced into a specific area of the fabric in a tuck-float stitch mode through an embedded weaving technology, and latent curl is activated through after-treatment. The moisture absorption expansion of the second spinning component is utilized to drive the composite yarn to macroscopically self-crimp, and the conductive filler inside is physically extruded to construct an efficient conductive skeleton, so that the humidity response adjustment and charge directional dispersion of the anti-static performance are realized, and the problems of fixed conductive state, local static accumulation and poor comfort of the existing fabric are effectively solved; and the safety and wearing experience of the clothes are improved.

The invention provides a storage system for immunofluorescence slide glass and an intelligent temperature and humidity coupling control method thereof. The system comprises a closed sample cabin, a controller, a passive buffer layer and other structures, and the temperature and humidity in the cabin can be stably controlled in a dynamic environment. The temperature and humidity in the cabin and the temperature of the key cold surface are monitored in real time through the sensing unit, the local dew point is calculated, and temperature and humidity control is executed. And the controller executes a layered gradient coupling control algorithm according to the dynamic dew point safety margin to ensure accurate control of temperature and humidity. The passive buffer layer is of a composite structure of a phase change material and a moisture absorption material, and the temperature and humidity are adjusted through solid-liquid phase change and molecular adsorption. The system can effectively improve the storage stability and safety of the immunofluorescence slide, and is suitable for sample storage management in industries such as life science and biological pharmacy.

The invention discloses a cellulose paper-based diaphragm for a zinc-iodine battery as well as a preparation method and application of the cellulose paper-based diaphragm. The diaphragm is of a three-layer composite structure and comprises a matrix layer formed by paper pulp fibers such as softwood pulp, hardwood pulp, bamboo pulp or straw pulp through a wet papermaking technology, and compact functional layers which cover the two sides of the matrix layer and are formed by oxidized nanocellulose (TOCN). The preparation method mainly comprises the following steps: preparing the paper-based diaphragm matrix through wet papermaking, coating the two sides of the paper-based diaphragm matrix with TOCN aqueous dispersion, and finally carrying out hot-pressing drying treatment to enable the three layers to be tightly combined. According to the invention, the nano aperture and the surface negative electricity functional group of the TOCN layer are utilized, so that physical blocking and electrostatic repulsion of polyiodide ions can be realized at the same time, and the shuttle effect is effectively inhibited; and the uniform pore channels can guide zinc ions to uniformly deposit and inhibit dendritic crystal growth. The diaphragm is green in raw material, simple in process and low in cost, and the cycle life and coulombic efficiency of the battery can be remarkably improved when the diaphragm is applied to the zinc-iodine battery.

The invention belongs to the field of wet electronic chemical purification, and particularly relates to a membrane chromatography filter membrane for removing charged ions in liquid and a preparation method thereof.The preparation method comprises the following steps that S1, membrane casting liquid is prepared, specifically, a positive electricity layer membrane casting liquid, a neutral layer membrane casting liquid and a negative electricity layer membrane casting liquid are prepared; s2, sequentially extruding the positive electricity layer membrane casting solution, the neutral layer membrane casting solution and the negative electricity layer membrane casting solution by using a three-layer die head, and coating on a polyester film; s3, exposing under the conditions of set temperature, humidity and air velocity, so that the casting membrane solution is subjected to preliminary phase splitting; s4, immersing the coated film in a pure water coagulating bath to complete phase splitting and curing; and S5, rinsing, drying and rolling to obtain the membrane chromatography filter membrane. By designing a special three-layer composite structure of'positive electricity layer-neutral layer-negative electricity layer ', the filter membrane can simultaneously adsorb anions and cations in a solution in a single filtering process, the limitation that a traditional single charge membrane can only remove one kind of ions is solved, and the purification efficiency is improved.

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

A broadband low-transmittance and high-absorption wave absorption and transmission integrated frequency selection surface comprises three wave absorption layers and two wave transmission layers which are sequentially stacked from top to bottom, and the three wave absorption layers are sequentially divided into an upper wave absorption layer, a middle wave absorption layer and a lower wave absorption layer from top to bottom; the two wave-transparent layers are sequentially divided into an upper wave-transparent layer and a lower wave-transparent layer from top to bottom; the multi-layer composite structure design is adopted, collaborative optimization of the wave absorbing performance and the wave transmitting performance is achieved by combining the two wave transmitting layers on the lower portion and the three wave absorbing layers on the upper portion, through organic combination of the upper layer structure and the lower layer structure, dual performance improvement of broadband wave absorbing and broadband wave transmitting is achieved, and a transition zone between a wave absorbing zone and a wave transmitting zone is greatly reduced.

The invention relates to the technical field of flexible electronics and sensing, in particular to a capacitive flexible pressure sensor based on a barium titanate composite dielectric layer, which sequentially comprises a lower electrode layer, an upper electrode layer, a lower electrode layer and an upper electrode layer from bottom to top, the composite dielectric layer is arranged on the lower electrode layer and is formed by compounding an elastic polymer matrix and a high-dielectric-constant barium titanate (BaTiO3) filler; the upper electrode layer is made of a flexible conductive material and is arranged on the composite dielectric layer; the lower electrode layer and the upper electrode layer are connected with an external capacitance measuring circuit through wires. According to the sensor disclosed by the invention, the comprehensive performance of high sensitivity, wide detection range, low hysteresis and excellent cycle stability is realized by optimizing the shape of the barium titanate filler, surface modification and composite structure design.

The invention relates to the technical field of anti-seismic performance detection, in particular to an anti-seismic performance detection method and system for an assembled steel-wood composite structure, and the method comprises the steps: arranging a multidirectional acoustic emission sensor in a steel-wood structure node area, applying simulated seismic vibration, and synchronously collecting acoustic emission signals; the method comprises the following steps: preprocessing collected acoustic emission signals, dividing the acoustic emission signals into signals corresponding to microcracks and contact slippage, respectively calculating an energy attenuation rate and a phase offset, and constructing a matrix; micro-impact is applied to the steel-wood node through an electromagnetic excitation device, a response signal is collected, resonant frequency is extracted, the drift distance between the resonant frequency and a reference value is calculated, and the severity of interface damage is determined according to the value of the drift distance; the damage correlation index calculation takes the characteristic value of the interface wave propagation characteristic matrix and the resonance frequency drift distance as input, the damage correlation index is calculated through the correlation coefficient, and the damage grade is divided according to the correlation coefficient. And differential characterization of different damage types is realized through the interface wave propagation characteristic matrix.

The invention relates to the technical field of analysis and detection, in particular to a surface enhanced Raman spectroscopy (SERS)-based nano material detection method, which is characterized in that a heterojunction composite structure consisting of noble metal nano stars and semiconductor oxide nano particles is used as an SERS active substrate; and a specific recognition molecule carrying a Raman reporter molecule is used as a detection probe. During detection, the recognition molecules are firstly combined with the to-be-detected nano material, and then the compound is adsorbed on the surface of the substrate. The tip structure of the noble metal nanostar and a heterojunction interface jointly generate a synergistic effect of electromagnetic enhancement and chemical enhancement, and a reporter molecule signal is doubly amplified, so that high-sensitivity and high-selectivity detection on a to-be-detected nano material is realized. The method solves the problems of weak signal and poor selectivity of the traditional method, and is suitable for rapid and quantitative analysis of trace nano materials in the environment.

The invention relates to the technical field of functional coatings of medical instruments, in particular to a temperature-sensitive response type sodium polyacrylate catheter leakage-proof coating, a preparation method and application thereof, and the coating is of a three-layer composite structure. And the bottom bonding layer adopts a polydopamine modified silane coupling agent system, contains silver nanoparticles, has the thickness of 5-15 microns, and ensures strong bonding and antibiosis of the substrate. The middle functional layer is a three-dimensional cross-linking degree gradient interpenetrating network polymer, is composed of a plurality of monomers and nano materials, and is 50-100 [mu] m in thickness, the cross-linking degree of the middle functional layer is gradually increased from inside to outside, gradient transition of mechanical properties is achieved, the outer protective layer is composed of a copolymer, is 3-8 [mu] m in thickness, and provides excellent anti-fouling and biocompatibility. The coating is endowed with strong adhesive force, gradient mechanical property and surface stability, the sodium polyacrylate component absorbs water and expands in urine to form sealing, and the expansion degree of the sodium polyacrylate component is regulated and controlled by the pH value and ionic strength of the urine.

The invention provides multi-structure-layer flaky silver-coated aluminum powder, a preparation method of the multi-structure-layer flaky silver-coated aluminum powder and a conductive rubber material. The multi-structure-layer flaky silver-coated aluminum powder comprises flaky aluminum powder, a silicon dioxide layer and a silver layer, the silicon dioxide layer is coated on the surface of the flaky aluminum powder, and the silver layer is coated on the surface of the silicon dioxide layer. According to the multi-structure-layer flaky silver-coated aluminum powder, the preparation method thereof and the conductive rubber material, the multi-layer composite structure design of aluminum core-silicon dioxide layer-silver layer is adopted, the problems that aluminum powder is poor in stability and silver is prone to migration are solved, and the multi-structure-layer flaky silver-coated aluminum powder has the advantages of being low in cost and resistant to shearing; therefore, the novel white conductive filler with high performance, high stability and high applicability is obtained.

The invention belongs to the technical field of sewage treatment, and particularly relates to an intelligent response filter material, a preparation method thereof and a denitrification deep-bed filter tank. The intelligent response filter material is of a three-layer composite structure and sequentially comprises a carbon source inner core, a transition layer and a wrapping layer from the inner layer to the outer layer; the carbon source core comprises aquatic plant powder, aggregate and reinforced fibers, the transition layer adopts a hydrophilic modified porous carrier, and the wrapping layer adopts a pH responsive polymer. According to the invention, the intelligent response type filter material prepared from aquatic plant straws is adopted, and the pH response type envelope can automatically adjust the release rate of a carbon source according to the pH change caused by the denitrification process, so that intelligent on-demand supply of the carbon source is realized, and the denitrification efficiency and the utilization rate of the carbon source are greatly improved.

The invention discloses large open type karst cave local rock forming equipment and method, and belongs to the technical field of karst area pile foundation construction. The problems that in traditional cloth bag pile construction, the hole collapse risk is high, the bearing capacity is insufficient, and grouting displacement of a steel reinforcement framework occurs are mainly solved. According to the equipment, grout overflow holes distributed in a staggered mode are preset in a variable-diameter hollow steel cylinder body, and a grout overflow groove is formed in the variable-diameter part of the cylinder bottom; the diameter of the upper part of the coarse structure is larger than that of the lower part of the coarse structure; the steel sleeve is anchored at the top of the steel cylinder and has larger diameter; the cylindrical plastic sleeve is adhered to the inner wall of the steel cylinder; the grouting pipe is arranged in the cylindrical plastic sleeve in a penetrating manner; and the annular hoop surrounds the outer side of the fiber bag through the plastic short pipe to form a bamboo-shaped constraint structure. The upper end of the fiber bag is anchored to the steel sleeve, and the lower end of the fiber bag is anchored to an anchor hole in the bottom of the steel cylinder. The equipment is used for large open type karst cave pile foundation construction, the hole collapse resistance is improved through a composite structure of the steel cylinder and the fiber bag, the bearing capacity is increased, and grouting displacement is prevented.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a gradient functional composite coating applied to a boiler heating surface and a preparation method of the gradient functional composite coating in order to solve the technical problems that an existing protective coating of the boiler heating surface is prone to abrasion and oxidation and high in cost. Collaborative design is formed, and gradient matching of mechanical properties and environmental failure resistance is achieved. The low-melting-point glass powder is combined with the rare earth catalytic effect, low-temperature ceramization is achieved, and thermal damage to a matrix is avoided. After the metal ceramic transition layer is sprayed, high-frequency induction remelting treatment is carried out, meanwhile, laser cladding is carried out on the surface of the ceramic surface layer, a nanocrystalline-amorphous composite structure is formed, and the bonding strength of the coating is improved.

The invention belongs to the technical field of composite material structures and energy storage, and discloses a multifunctional energy storage composite structure of an embedded lithium ion battery and a preparation method of the multifunctional energy storage composite structure. The composite structure comprises an upper-layer skin, a lower-layer skin and an integrated energy storage layer located in the middle. The integrated energy storage layer comprises a sandwich panel and an energy storage unit; the sandwich panel is provided with a honeycomb or a grid; the energy storage units are embedded into honeycombs or grids of the sandwich panel; the raw materials of the upper-layer skin and the lower-layer skin are at least one layer of fiber prepreg. Through the application of the epoxy resin fiber composite material (fiber prepreg), the battery pack body becomes a part of the structure, electrical-structural integration is realized, an independent metal battery shell is not needed, the weight is reduced, and the bearing capacity and the heat-conducting and electrical-conducting properties of fibers are fully utilized; a hot-pressing integrated process is adopted for preparation, the technological process is simple and feasible, and the manufacturing cost is reduced.