143results about How to "Meet basic requirements" patented technology

An anti-collision radar system for a vehicle comprises radar detectors, an infrared distance measurement detector, an infrared imaging sensor, a data processing module, a system terminal and a wireless communication module, wherein two short-distance radar detectors are respectively arranged at the front end and the rear end of each side surface of the vehicle; a short-distance radar detector and the middle-distance infrared distance measurement detector are arranged at the tail of the vehicle; a far-distance radar detector and the infrared imaging sensor are arranged at the head of the vehicle; an inputting end of the digital signal processor is connected with the far-distance radar detector, the short-distance radar detectors and the middle-distance infrared distance measurement detector; an outputting end of the digital signal processor is connected with a signal driving unit; an outputting end of the signal driving unit is connected with the system terminal; and the data processing module is connected with the wireless communication module. The anti-collision radar system for the vehicle has the advantages that the radar system surrounds the periphery of the vehicle; and safe driving assistance can be provided for a driver under the conditions of severe weathers, bad road conditions, traffic jam or fatigue of the driver and the like, and accidents are prevented.

The invention belongs to the technical field of high polymer materials and relates to a side-chain sulfonic acid type polyarylether polymer which has high thermal stability and is used in a proton exchange membrane of a fuel cell and a preparation method thereof. The preparation method comprises the following steps: adding a diphenol monomer, a sulfonated difluoro-monomer, a difluoro-monomer and anhydrous potassium carbonate in a three-necked bottle provided with a stirrer, a water-carrying device and a nitrogen hole, adding a solvent and an azeotropic dehydrant which accounts for 20% of the solvent by volume in the three-necked bottle, injecting nitrogen, and heating to reflux the azeotropic dehydrant; and refluxing for 2-5h to dehydrate, evaporating the azeotropic dehydrant, heating to 175-190 DEG C to react for 5-8h, then pouring the reaction mixture in water to obtain a polymer, grinding the polymer to fine particles by using a grinder, filtering by using a buchner funnel, washingwith deionized water and ethanol several times, and performing vacuum drying at 100-110 DEG C for 10-15h to obtain the side-chain sulfonic acid type polyarylether polymer with high thermal stability,good solubility and film-forming property and low water absorption rate.

The invention discloses a high-isolation dual-polarization E-type microstrip antenna with a spurious wafer. The antenna has the advantages of high isolation, low cross polarization, small size and simple structure. The antenna adopts a double-layer E-type patch form; E-type patches are respectively printed on both upper and lower surfaces of an upper dielectric slab; slotting directions of the E-type patches are orthogonal; and two linear polarizations in the direction of plus and minus 45 degrees are respectively generated by coaxial probe feed. The high-isolation dual-polarization E-type microstrip antenna has the biggest innovations that two E-type patches are respectively printed on both the surfaces of the same dielectric slab; a conventional single-polarization E-type patch antenna is expanded to a dual-polarization E-type patch antenne; and the high isolation and the low cross polarization characteristic are obtained. Under the condition that the return loss is lower than minus 15dB, the bandwidth of 7.7 percent can be reached, the isolation is lower than minus 30dB, a directional diagram is stable, the cross polarization is good, and the gain is in the range of 6.8dBi-7.4dBi. The high-isolation dual-polarization E-type microstrip antenna can be applied to a micro mobile base station.

The invention provides a telescopic truss type binary optical space camera and an on-orbit work method thereof and belongs to the field of spaceflight space repeatable unfolding. The telescopic truss type binary optical space camera aims to solve the problems that an existing space foldable and spreadable framework type supporting arm is complicated in structure, heavy and difficult to repeatedly fold and unfold. A partitioned type spreadable optical main lens of the telescopic truss type binary optical space camera is installed on a supporting arm through three ball hinges. The supporting arm comprises multiple framework type foldable units. The on-orbit work method comprises the steps that during launching, the supporting arm and the partitioned type spreadable optical main lens are in a folded mode, and the optical camera is in a launch closed mode; after injection, the supporting arm is switched to a unfolding mode and is unfolded; after the supporting arm is unfolded appropriately, the space camera is switched to an on-orbit operation mode, and the partitioned type spreadable optical main lens is unfolded; when the space camera is switched to an on-orbit closed mode, the supporting arm is folded, and the partitioned type spreadable optical main lens is unfolded. The telescopic truss type binary optical space camera is a large-caliber space camera.

A condenser-like microwave power sensor utilizes the microwave power transmitted on a coplanar waveguide to attract the MEMS cantilever to result in the displacement of the cantilever and gets a microwave power structure transmitted on the coplanar waveguide by testing the change of capacitance between the catilever and the sensing electrode, in which, said sensor takes GaAs or a Si substrate as the substrate with a coplanar waveguide, a cantilever vertical to and floating above the waveguide is set on the earth wire of the waveguide and a sensing electrode is connected below the end of the catilever.

The invention discloses an L-shaped retaining wall structure of a cross-over type special-shaped counterfort. The structure comprises a wall body structure and a pile foundation, wherein the wall body structure comprises a wall panel, and a wall toe slab and a wall heel slab which are vertical to the wall panel, the wall toe slab is concave, counterforts are vertically arranged on the slab planes on the two sides of the wall toe slab, and wall top plates are arranged on the two counterforts. The retaining wall disclosed by the invention is designed to be in a counterfort structure; each wall toe plate is designed to be concave; the whole structure is one-time poured to form a whole body; not only can soil be retained, but also a man hole can be stridden; the influence of underground pipelines on the construction of a new pipeline can be reasonably avoided, not only can the construction of a newly-built railroad bed and running safety be ensured, but also the safety of the underground pipelines is ensured, as well as the problems of complex newly-built railways and underground pipelines, strained site space layout and construction safety are solved; and the retaining wall structure is safe and reliable, can be applied to a district with a complex site and a limited district, and can be used for solving the problems of the influences caused by strained lands, complex underground pipeline distribution and the like.

The invention discloses a tobacco PDS gene fragment-containing cucumber mosaic virus RNA2 attenuated mutant type plasmid vector and application thereof. The plasmid vector contains a CMVFny strain RNA2 complete sequence, and a tobacco PDS gene 199bp fragment is inserted behind a 2a protein termination codon. The plasmid vector and a wild CMVFny RNA1 and wild CMVFny RNA3-containing plasmid are inoculated to nicotiana benthamiana through an agrobacterium infiltration method, so that weakly pathogenic symptoms can be displayed, and the capacity of inducing gene silencing can be judged with nakedeyes without depending on an instrument; great convenience is provided for deep researches on attenuated vaccines.

The invention provides a simple overwintering method for succulent plants, and belongs to the technical field of plant cultivation. The method comprises the following steps: (1) collecting materials; (2) preparing a culture medium; (3) firstly transplanting in a period being 1-2 months ahead of winter, cultivating the succulent plants with the culture medium; (4) in winter, when the temperature is lower than 5 DEG C, covering the succulent plants with a bottle treated in the step (1), wherein the bottom of the bottle is 5-7cm higher than the tops of the succulent plants, and the width of a body of the bottle is greater than those of the succulent plants; (5) covering the succulent plants with the bottle without ventilation, keeping pot soil for the succulent plants dry, when the air temperature is higher than 30 DEG C, removing the bottle, and wiping off water drops in the bottle; and (6) carrying out pest control. The simple overwintering method for the succulent plants conforms to the growth habits of the succulent plants; the culture medium can meet basic requirements of the succulent plants on the soil; the growth of the succulent plants can be significantly promoted; the survival rate is high; and the method is simple and convenient.

The invention provides a power distribution network project investment decision technology considering comprehensive effects. The power distribution network project investment decision technology comprises the following steps: s1, establishing a multi-dimensional power distribution network investment comprehensive effect evaluation index system; s2, determining an evaluation index set and a comment set, and establishing a fuzzy relation matrix of evaluation indexes; s3, carrying out comprehensive weight calculation by using an analytic hierarchy process and an entropy weight method; s4, obtaining a final evaluation result according to the product of the comprehensive evaluation fuzzy vector and the weight vector of the index. Calculation case analysis shows that the investment decision ofthe power distribution network project can be scientifically and comprehensively supported, and the method has good application and popularization prospects.

The invention discloses an aircraft power supply network dynamic programming management method, mainly solves problems that an aircraft power supply network conventional management method is high in workload and low in operation speed and has no generality of different aircraft types, and belongs to the technical field of aircraft power supply network management. The optimal control theory is applied to aircraft electric energy management, the dynamic programming power supply network management method is applied to realize aircraft power supply network management, the optimal power supply structure of a power supply network is acquired, and redundant power supply and fault-tolerant reconstruction of the power supply network can be realized. Besides, the management method is simple and great in generality. A method of exhaustion can be effectively replaced by the method so that aircraft power distribution network automatic management is realized, reliable power distribution of the power supply network is guaranteed, and the novel method is provided for multi-electric-aircraft multichannel complex power supply network management.

The invention relates to a semantic segmentation method and system based on pixel rearrangement reconstruction for streetscape understanding, and the method comprises the steps: carrying out the preprocessing of an input image of a training set, enabling the image to be standardized, and obtaining preprocessed images with the same size; extracting general features by using a convolutional network,then obtaining dense perforated space pyramid fusion features, and extracting coding features by using the two parts of cascade connection as a coding network; selecting an intermediate layer featurefrom the convolutional network, calculating an edge feature by combining the encoding feature, taking a dense network based on a pixel rearrangement technology as a decoding network, reconstructing the image resolution, and calculating the decoding feature; performing calculating to obtain semantic segmentation loss and auxiliary supervision edge loss, and training the deep neural network by taking minimization of weighted sum loss of the semantic segmentation loss and the auxiliary supervision edge loss as a target; and performing semantic segmentation on the to-be-segmented image by using the deep neural network model, and outputting a segmentation result. The method and the system are beneficial to improving the accuracy and robustness of image semantic segmentation.

The embodiment of the invention provides a data transmission method and device in a TEE system, and the method is executed by a first thread from a TEE side, and comprises the steps: obtaining first data; calling a predetermined function by taking the first data as an input parameter so as to switch to a non-TEE side; obtaining a write offset address by reading the first address; obtaining a readoffset address by reading the second address; judging whether the number of bytes of the first data is smaller than or equal to the number of writable bytes or not, wherein the number of writable bytes is determined based on the write offset address and the read offset address, and each address corresponds to one byte; when the byte number of the first data is smaller than or equal to the writablebyte number, writing the first data into a third address starting from the write offset address; updating a write offset address in the first address; and returning to the TEE side.

The invention provides a 3D printing auxetic yarn, a processing method and an application. The 3D printing auxetic yarn is characterized by comprising a multi-layer structure formed by 3D printing, the surface of each layer comprises aN auxetic geometric structure, and the adjacent layers are connected to each other. The 3D printing auxetic yarn, the processing method and the application can be applied to the design of the auxetic yarns with simple structures, and with complex structures such as non-cylindrical section auxetic yarns, composite yarns and the like, and the obtained stretched yarn structures has good controllability; and meanwhile, the system is simple in implementation process, a large number of intermediate processes are not needed, damage to the yarn performance due to themulti-stage process in the traditional spinning process is avoided, yarns with the optimal performance under the design structure can be obtained, the production efficiency is high, the manufacturedyarn is good in tensile effect and stable in structure, the mechanical property is excellent, adjustability is large, and the basic requirements of functional textiles can be met.

The invention discloses a preparation method of an aloe polysaccharide / bacterial cellulose composite membrane for a medical dressing. The preparation method comprises the following steps: activating a strain Acetobacter xylinum NUST4.2; preparing a seed solution of the strain Acetobacter xylinum NUST4.2; adding aloe polysaccharide with different concentrations into a fermentation culture medium of the strain Acetobacter xylinum NUST4.2 to carry out dynamic-static combined fermentation production, so as to obtain an aloe polysaccharide / bacterial cellulose composite membrane; purifying the aloe polysaccharide / bacterial cellulose composite membrane; respectively carrying out infrared characterization and scanning electron microscope observation on the structure and morphology of the aloe polysaccharide / bacterial cellulose composite membrane; and carrying out physical performance test on the aloe polysaccharide / bacterial cellulose composite membrane as a medical dressing, so as to show that the requirements of the medical dressing are met. By virtue of the preparation method, more choices are provided for the medical dressing for healing skin wounds, and meanwhile, a positive role for the development of the medical dressing is achieved.

The invention discloses an environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic which has the following formula: Li1+m-nNb1-m-3nTim+4nO3+awt%ZnNb2O6+bwt%MnCO3+cwt%CuO+dwt%Bi2O3+ewt%Li2CO3, wherein m is more than or equal to 0.05 and less than or equal to 0.2, n is more than or equal to 0.05 and less than or equal to 0.175, a is more than or equal to 0 but less than and equal to 10, b is more than or equal to 0 and less than or equal to 4, c is more than 0 and less than or equal to 4, d is more than or equal to 0 and less than or equal to 4, e is more than 0 and less than or equal to 6, and a, b, c, d and e are a mass fraction. In the formula, ZnNb2O3 is added to adjust the frequency temperature coefficient, so that the frequency temperature coefficient of the Li1+m-nNb1-m-3nTim+4nO3 ceramic approaches to zero; and the combined use of MnCO3, CuO, Bi2O3 and Li2O3 which conform to the environmental requirements can reduce the sintering temperature of the Li1+m-nNb1-m-3nTim+4nO3 ceramic to be below 900 DEG C, so as to achieve the effect of co-firing with a high electric conductivity silver electrode and also maintain excellent microwave dielectric property (epsilon is equal to 50 to 75, Qf is more than 4000 GHz). The ceramic material can be applied to manufacture high-pass filters, Baluns, Balun filters and other chip-type multilayer microwave ceramic elements in wireless communication.

The invention discloses a quadruple spiral distribution loading oscillator microstrip antenna applied to a Beidou system and relates to a microstrip patch antenna. The quadruple spiral distribution loading oscillator microstrip antenna applied to the Beidou system is low in echo loss, low in interference, high in gain, high in symmetry, high in integration level and miniature and has the directed radiation characteristics. The quadruple spiral distribution loading oscillator microstrip antenna applied to the Beidou system is provided with a substrate, wherein copper is coated on two sides of the substrate; the upper surface of the substrate is provided with a quadruple spiral oscillator arm structure; the sides of the quadruple spiral oscillator arm structure form a spiral oscillator in a rewinding form; a loading hole and a feed hole are formed in the spiral oscillator; the quadruple spiral oscillator arm structure is rewound by 720 degrees towards the center of each side; the lower surface of the substrate is provided with a grounding plate; the grounding plate is connected with an outer core of a feed copper axis; and the loading hole is connected with an inner core of the feed copper axis.

The invention relates to the fields of printing and packaging, in particular to a manufacturing method of an ink-free printing label or package. According to the structure, black and white display and color display of words and images are achieved by utilizing diffraction, scattering, reflection, refraction and the wave guide phenomenon of guide which are generated by a microstructure. The microstructure is characterized in that speckles at specific rules and lines with composite periods are displayed as black and white comparison when the frequency is 10 micrometers-150 micrometers, are displayed as color diffraction images when the regular period frequency is 0.3 micrometer-10 micrometers and are displayed as three-dimensional images when the irregular period frequency is 1 micrometer-2 micrometers. According to the method, graphics and text information is converted into the microstructure structure design to be expressed, the printing label or the package can be molded at a time through mould copying, so technological links are reduced, the cost is lowered, and environment protection and low carbon can be achieved better; a traditional oil printing package can be updated and replaced by the ink-free printing package, and the ink-free printing package has the advantages of being environmentally friendly, scientific, fashionable, safe and resistant to fake and the like.

The invention discloses a method for preparing glass ceramic by sintering bulk of solid waste coal gangue and rice husk ash serving as main raw materials. The glass ceramic provided by the invention is prepared from the following raw materials in parts by weight: 28.1 to 32.5 parts of coal gangue, 4.0 to 6.5 parts of rice husk ash, 3.5 to 5.0 parts of sodium carbonate, 7.0 to 8.5 parts of calciumcarbonate, 2 to 3 parts of magnesium oxide and 2 to 3 parts of titanium dioxide. The method comprises the following steps: mixing the ingredients evenly, and heating to a melting temperature of 1,400to 1,450 DEG C; performing quenching, ball milling and tableting on the obtained glass melt, preserving heat at 740 to 790 DEG C and 820 to 870 DEG C for 1 to 1.5 hours, and performing heat treatmentto obtain glass ceramic which takes calciclase as a principal crystalline phase and takes diopside as a secondary crystalline phase. A large amount of SiO2 in the rice husk ash serving as a raw material reduces the high aluminum characteristic of the coal gangue, adjusts the ratio of Si to Al in the formula, and improves the utilization ratio of the solid waste coal gangue and rice husk; moreover,the method has the advantages of simple formula composition, low melting temperature and relatively low heat treatment temperature; the prepared glass ceramic has high compactness, corrosion resistance and wear resistance, and the added value of two solid wastes of coal gangue and rice husk is greatly increased.

The invention discloses a method for manufacturing a novel flexible printed circuit. The invention discloses a method for manufacturing a novel flexible printed circuit. The method comprises coveringa base material required to prepare a flexible circuit with a patterned mask, wherein the mask is hollowed out and has a patterned circuit; by using the ultrasonic precision atomization spraying technology, ultrasonically atomizing configured nano-conductive ink, and generating micron-order fine droplets at a nozzle; at the same time, adding a certain pressure of compressed air to uniformly coat the base material covered with the mask with the ink mist drops under the guidance of an airflow; and according to the nature of the nano-conductive ink, annealing and sintering the base material so asto complete the preparation of the flexible circuit. The method can meet the requirements for flexible circuits on the market, and can control the spraying thickness and adapt to different base material. The present invention provide a new idea for the preparation process and method of the flexible circuit board.

The invention relates to a preparation method of glucan embolism microspheres with a CT (computed tomography) visualization function. The preparation method is characterized by comprising the steps of dissolving polymethyl vinyl ether maleic anhydride grafted with beta-CD and modified glucan in water; uniformly stirring and then dropwise adding the solution into dimethyl silicone oil, wherein the volume ratio of a water phase to an oil phase is 1:5; under the condition of magnetic stirring, heating to 60-120 DEG C to react for 16-48 hours; after the reaction, standing and then removing supernatant fluid; cleaning microspheres deposited at the bottom of a container by using n-hexane; removing the remaining dimethyl silicone oil; and performing vacuum drying to remove the n-hexane on the surface to obtain gel microspheres with the particle size of 30+ / -5 microns and good dimensional homogeneity. The gel microspheres are added into a developer iodine solution or iodized oil, and the microspheres are discovered to have an obvious gray level through micro-CT observation.

The invention discloses a suture line applicable to an operation of biliary tract and a preparation method thereof. The suture line is prepared by the following methods: (1) preparing a spinning solution, namely dissolving chitosan in acetic acid solution with mass concentration of 2-4%, sequentially adding sodium hyaluronate and polyvinyl alcohol, stirring for 3-5 hours, adding collagens, further stirring 10-12 hours, filtering, and removing bubbles under vacuum conditions, thereby obtaining the spinning solution; (2) spinning, namely infusing the spinning solution into a spinning nozzle by using a metering pump, extruding the spinning solution into a coagulating bath, and stretching while coagulating, thereby obtaining the thread; (3) preparing antibacterial liquid; and (4) dipping and performing after-treatment, namely cleaning the thread obtained in the step (2) by hot water, soaking in the antibacterial liquid obtained in the step (3) for 20-30 minutes, taking out and drying at room temperature, sterilizing and packaging.

The invention provides a method for designing a server board-level power supply with input being 48V and belongs to the field of design of server board-level power supplies. By virtue of the method, two-stage voltage conversion is used; the first-stage voltage conversion is characterized by converting 48V to 12V; the second-stage voltage conversion is characterized by converting 12V to power supplies which are applied to other server systems; the input voltage being 48V is converted to a power supply which is applied to a 12V server; subsequently the voltage is used for supplying power for a DC / DC power supply for a CPU and a memory BUCK, so that the input voltage being 48V is converted to voltage being 5V, 3.3V and the like used by the CPU, the Memory and a system in the server, and the overall conversion efficiency of the power supply is improved.

The invention provides an inductive agent for regeneration of periodontium tissue of temperature sensitivity, which is a temperature sensitivity hydrogel composite body taking chitosan, chitosan quaternary ammonium and Alpha, Beta-phosphate as carriers, and the carriers are loaded with plasmids containing bone tissue growth factor coding genes. The invention also provides a preparation method forthe regeneration of periodontium tissue of the temperature sensitivity. In the invention, the composite body is planted into a body, target DNA directly transfects target cells and continuously expresses coded growth factors, rebuilds and recovers the growth activity of osteoblast; along with the gradual degradation and absorption of biological support materials, tissues with the original specialstate and function are formed, so that the purpose of alveolar bone regeneration and function rebuilding are achieved. In the invention, the defect that the half-life period is short due to the direct application of an exogenous growth factor is overcome, and the barrier of immunological rejection as the exogenous cells are planted into the body is broken through, therefore, the clinical application value and the clinical application potential are exact.

The invention relates to a composite material toughed by a flexible material for cases as well as a preparation and application thereof. The composite material also comprises a flexible material, and the flexible material is paved between a piece of fiber fabric or a prepreg. The flexible material is paved between the fiber fabric or the prepreg, after paving the layers, moulding and solidification are carried out, and the toughed composite material for cases is obtained. The special flexible material paving layer is added into the composite material paving layer, appearance and performance of the product are not influenced, toughness of the product is greatly improved, impact resistance of the case housing is greatly improved, the service life is increased, and noise during skidding is reduced.

The invention relates to a piezoresistance microwave power sensor which uses terminal resistance to absorb the microwave power to heat to generate film stress, and uses piezoresistance to test the input microwave power, wherein said sensor uses Si substrate (1) as substrate; the Si3N4 / SiO2 layer (9) is arranged on the bottom of substrate; the Si substrate is arranged with SiO2 insulated layer (2); said SiO2 insulated layer (2) and the silicon film (11) etched on Si substrate form dual-layer film (8) structure arranged with common-surface waveguide (3). The terminal of common waveguide is arranged with matched resistance (4).

The invention belongs to the technical field of packaging materials, and particularly relates to a preparation method of a gallic acid cross-linked chitosan-gelatin active composite membrane. The preparation method comprises the following steps: mixing a chitosan solution and a gelatin solution, and uniformly stirring to obtain a chitosan-gelatin blended solution; then preparing a gallic acid aqueous solution, adding the gallic acid aqueous solution into the chitosan-gelatin blended solution, fully stirring, and reacting to obtain a film forming solution; and pouring the film forming liquid into a flat plate, drying to form a film, and lightly stripping the film from the flat plate to obtain the active composite film. The chitosan-gelatin-gallic acid active composite membrane is prepared by taking a chitosan and gelatin blended solution as a membrane matrix, taking gallic acid as a natural cross-linking agent and adding an active substance. The active membrane has the characteristics of good mechanical properties, strong antioxidant and antibacterial capabilities and the like, has no toxic effect on a human body, and is safe and environment-friendly; and the composite membrane can be used as a food packaging material, and can effectively delay the decay process of food, thereby prolonging the shelf life of food.

The invention brings forward a species taxonomy method based on diversity comparisons of distances among amino acids in protein sequences. The method comprises following steps: S10, numbering each amino acid of a protein sequence; S20, calculating the distance between every two adjacent proteins of the same kind in each protein sequence; S30, counting frequency of different distances between every two adjacent proteins of the same kind in each protein sequence; and S40, comparing statistical data in a pair-wise sequence manner, setting up distance matrixes and performing species taxonomy by calculating phylogeny trees in generating systems based on distance matrixes. The species taxonomy method based on diversity comparisons of distances among amino acids in protein sequences has following beneficial effects: differences among amino acid in sequences are shifted to be those among distances of amino acid so that space is saved and no gap is required; and the method is easy and helps to simplify calculation amount.

The invention discloses a water-soluble cationic benzylidene cyclopentanone photosensitizer and a synthetic method and application of the photosensitizer in photodynamic sterilization. The photosensitizer has a simple molecular structure, has a determined chemical structure, has appropriate fat-to-water ratio, has fat-water amphipathy, has mild reaction condition for synthesis, and is easy to prepare and purify. The operation is simple. The photosensitizer has high biological photodynamic activity within the 350-600 nm wavelength range, can be used for selective photodynamic inactivation of pathogenic microorganisms and avoids from damaging host cells and tissues as much as possible, has a broad-spectrum antibacterial property, and has a great application prospect in the aspect of photodynamic sterilization.

The invention discloses a wood-plastic composite material for machining a building external wall decorative plate and a preparation method thereof and relates to the technical field of wood-plastic composite materials. The wood-plastic composite material is prepared from the following raw materials in parts by weight: 20-25 parts of linear low density polyethylene, 10-15 parts of lignocellulose, 5-10 parts of polyvinyl alcohol resin, 5-10 parts of microcrystalline cellulose, 3-6 parts of polyethylene oxide, 2-3 parts of ultrafine polytetrafluoroethylene powder, 2-3 parts of cross-linked polyvinylpyrrolidone, 2-3 parts of a pigment, 1-2 parts of petroleum coke micro-powder, 1-2 parts of asbestos wool, 1-2 parts of nano glue powder, 1-2 parts of anionic polyacrylamide, 0.5-1 part of magnesium aluminosilicate and 0.5 to 1 part of sulfated castor oil. The wood-plastic composite material disclosed by the invention has a good molding property and is specially used for machining the building external wall decorative plate; and the decorative plate has excellent mechanical properties and also has good wearing resistance, impact resistance and freezing-thawing resistance so that the service life of the decorative plate is prolonged.