73results about How to "Technically difficult" patented technology

The invention discloses a preparation method for platinum-copper nano-particles with controllable morphologies. The preparation method comprises the following steps: 1) mixing a reductive organic solvent, a platinum source and a copper source to obtain a mixed solution A; 2) heating and stirring the mixed solution A at 80-130 DEG C and under the condition of inert atmosphere protection until all solid reagents are completely dissolved to obtain a solution B; 3) stopping charging the inert gas, and charging a gas C in the solution B; and 4) heating the solution B to 210-250 DEG C and insulating heat to obtain a suspension D, cooling the suspension D to room temperature, centrifuging, taking bottom precipitates, and centrifugally washing the bottom precipitates by virtue of an organic solvent to obtain black precipitates, that is, the platinum-copper nano-particles. The method is simple and practicable, and the octahedral platinum-copper nano-particles are obtained through controllable synthesis; and moreover, the platinum-copper nano-particles obtained by the method are monolayer-dispersed and uniform in dimension, and have an average particle diameter of less than 10nm. The platinum-copper nano-particles can be used as a nano-catalytic material.

The invention discloses polymer dispersed liquid crystal shearing effect privacy glass and a preparation method and application thereof and relates to privacy glass based on polymer dispersed liquid crystal. The privacy glass is formed by clamping one layer of polymer dispersed liquid crystal shearing effect film between two pieces of flat glass; the polymer dispersed liquid crystal shearing effect film is formed mainly by mixing prepolymer and nematic liquid crystal material according to the mass ratio of 1:1-3, the prepolymer comprises 20 percent of alkoxy nonylphenyl acrylic ester, 70 percent of trimethylolpropane triacrylate, 5 percent of chain transfer agent and 5 percent of light trigger 1173, and the flat glass is super flat heavy sheet glass which is the raw material of the unplated transparent conducting layer of the transparent conducting glass for a plasma panel display or a liquid crystal display, wherein the thickness is 3-8 mm. The privacy glass has the functions of turning-on and turning-off, is particularly applied as functional curtains in the building decoration industry, has very low production cost, is bistable for turning-on and turning-off and needs no electricity in use.

The invention relates to a galvanized self-lubricating metal material which comprises a galvanized metal substrate and a self-lubricating coating positioned on the galvanized metal substrate, wherein the self-lubricating coating is a product after a self-lubricating agent composition is solidified; the self-lubricating agent composition contains a trivalent chromium compound, silica gel and organic carboxylic acid and has the pH value of 4-7. Because the galvanized self-lubricating metal material is formed by solidifying the self-lubricating agent composition which contains the trivalent chromium compound, the silica gel, water and the organic carboxylic acid, the galvanized self-lubricating metal material not only has high lubricating property and corrosion resistance, but also can greatly reduce the requirement on the substrate of the galvanized self-lubricating metal material, and a hot dip galvanized plate with large surface roughness volatility and low price can be used as the substrate, thus the galvanized self-lubricating metal material has stronger market competition and higher economic benefit and represents the development direction of self-lubricating plates.

A display device consists of a set of polarized light separator for separating nonpolarized light to be polarized light P and S, crystal light valve LCD1 and LCD2 to control light P and light S, one projective lens and one projective screen. It is featured as displaying left and right eye image formed by integrated light path separately and viewing two images in different polarization state by wearing polarized light glasses so as to form 3-D visual effect in the cerebrum.

The invention discloses a method for synthetically treating and using plant stem leafs and straws in large scale and a device thereof. The method comprises the steps of: taking the plant stem leafs and straws as raw materials; and generating marsh gas, marsh slag and marsh liquid by means of microbial fermentation. The marsh gas is collected by the technology of the invention to be synthesized into fuel carbinol, or is purified and liquefied to be used as fuel for a vehicle to replace the natural gas; and the marsh slag and the marsh liquid are taken as fertilizer to be returned to the soil to maintain the ecological balance of the soil.

The invention provides a non-metal pipeline hydraulic pressure seepage verifying attachment. A system of the non-metal pipeline hydraulic pressure seepage verifying attachment comprises a rectangle framework body, a bell end bulkhead, a jack bulkhead, a pipeline holt hoop iron, a jack, a water flooding pressure measurement system on the bell end bulkhead, and an operation method. The invention is characterized in that: the rectangle framework body forms a rectangle through channel steel welding, length of the rectangle is set according to length of a segment of pipeline, width of the rectangle is set according to a maximal diameter of a detected pipeline, and the rectangle framework body is provided with the pipeline holt hoop iron inside; one end of an intake and exhaust connecting pipe is connected with the bell end bulkhead, the other end of the intake and exhaust connecting pipe is connected with one end of a pressurization opening valve, an intake and exhaust valve and a pressure maintaining opening valve respectively, the other end of the pressurization opening valve is connected with a pressurization pressure gauge, and the other end of the pressure maintaining opening valve is connected with a pressure maintaining pressure gauge; the operation method is carried out according to certain steps. The verifying attachment has small investment, low cost and low technology difficulty, and is applied to a field pipeline construction site and a small scale pipeline production manufacturer.

The invention discloses a preparation method of a cerium-containing magnet with high coercivity. The method comprises steps that raw materials of the Ce-containing main alloy are blended; raw materials of the grain boundary optimization auxiliary alloy are blended; the raw materials of the Ce-containing main alloy and the raw materials of the grain boundary optimization auxiliary alloy are subjected to vacuum smelting and rapid hardening melt-spinning treatment correspondingly, and a Ce-containing main alloy rapid hardening sheet and a boundary optimization auxiliary alloy rapid hardening sheet are obtained; the Ce-containing main alloy rapid hardening sheet and the grain boundary optimization auxiliary alloy rapid hardening sheet are mixed according to a weight ratio of 1:x, then hydrogendecrepitation treatment and jet milling treatment are performed to obtain mixed powder, lubricating agent is added into the mixed powder and mixed to obtain mixture; magnetic field orientation compression of the mixture is performed, and isostatic cool pressing is performed to obtain a green body; sintering of the green body is performed, and then tempering heat treatment is performed to obtain acerium-containing magnet. The method is advantaged in that the preparation process is effectively simplified, and the risk that the auxiliary alloy is oxidized can be effectively reduced.

The invention relates to an electrode and machining device and method for electrolytic cutting rapid forming of a turbine disc mortise, and belongs to the technical field of aero-engine turbine disc mortise electric machining. The electrode is a cutting electrode and is used for serving as a tool cathode on an electrolytic machine tool to carry out rapid cutting forming machining on the turbine disc mortise. The machining device adopting the electrode as the cutting electrode comprises a power source, a work box, a turbine disc part, the cutting electrode, a workpiece clamping and locating system and an electrolyte circulating system. The method adopting the device for cutting machining comprises the steps that equipment is mounted, alignment is carried out, a machining gap is adjusted, cutting machining is carried out, machining parameters are controlled in the machining process, after machining is completed, the turbine disc part is rotated to the next station in an indexing manner,and the process is repeated till electrolytic cutting machining of the whole turbine disc mortise is completed. The method adopts the cutting electrode for electrolytic cutting rapid forming, and through the electrolytic cutting rapid forming machining technological process, high-efficiency and high-quality machining of the turbine disc mortise is completed.

The invention provides a method for producing dehydroepiandros-sterone, comprising the following steps of: drying ketoxime substance obtained after the oximation reaction of diene till water content is not more than 0.5 percent; adding into benzene dehydrated with edible salt for raising the temperature and dissolving; after complete dissolving, reducing the temperature by 38+ / -2 DEG C and adding pyridine; reducing the temperature by 5-8 DEG C with saline water; dropwise adding mixed solution of phosphorus oxychloride and benzene and controlling the temperature within 15 DEG C during dropping; keeping the temperature of the mixed solution within 16-18 DEG C for three hours; rapidly adding dilute acid liquid and then raising the temperature to 58+ / -1 DEG C; keeping the temperature and reacting for 2 hours within 58+ / -1 DEG C; and feeding wastewater into a storage tank, washing three times till the wastewater is neutral, filtering materials, adding water, steaming and distilling for hydrolysis reaction. The invention effectively reduces the consumption of phosphorus oxychloride and hydrochloric acid, simultaneously recovers the wastewater, carries out displacement reaction by using caustic soda to displace pyridinium in the wastewater into pyridine, purifies and recycles the pyridine, greatly reduces the cost of products while ensuring the quality of the product and improves the market competitiveness.

The invention discloses a lubricating oil composition for an industrial robot speed reducer. The lubricating oil composition comprises 84.0-95.91wt% of polyalkylene glycol, 3-10wt% of a sealing applicability improver, 0.1-2.0wt% of an extreme pressure anti-wearing additive, 0.01-1.0wt% of a metallic deactivator, 0.05-1.0wt% of an anti-rusting corrosion inhibitor, 0.5-3.0wt% of an anti-oxidation additive and 10-20mu g / g of a defoaming agent, wherein the polyalkylene glycol is a linear polymer taking ethylene oxide and propylene oxide as main raw materials; the polymer comprises 50-70% of an EO(Ethylene Oxide) unit and 30-50% of a PO (Propylene Oxide) unit; the sealing applicability improver is a saturated polyol ester or diester. The lubricating oil composition has excellent viscosity-temperature performance and low-temperature performance, excellent oxidation stability and good extreme pressure wearing resistance, anti-rusting corrosion resistance and foam resistance, an oil film canbe rapidly formed, operation temperatures can be reduced, energy consumption can be reduced, the transmission efficiency of a speed reducer is degraded, the wearing of tooth surfaces can be reduced, and lubricating requirements of multi-stage speed reducers of multi-axis industrial robots can be met.

The invention discloses a nuclear power plant firefighting information application system. The system consists of a firefighting permit transaction module, a firefighting authorization training module, a real-time firefighting system state monitoring module, a full-time fire brigade management module, a firefighting preplan module, a firefighting action module, a firefighting potential safety hazard data module and a firefighting equipment management module, wherein the firefighting permit transaction module is used for realizing digitalization and informatization of nuclear power plant firefighting safety management work, carrying out macro management on nuclear power plants, and achieving office automation, management informatization and decision scientification by utilizing an advancednuclear power plant firefighting informatization system. According to the system provided by the invention, a set of firefighting informatization system particular for nuclear power plants is established by utilizing cutting-edge network computer technologies such as computers, cloud networks, interconnection and the like, so that the traditional nuclear power firefighting work development mode isconverted into an intelligent firefighting informatization mode so as to better serve the rapidly developing nuclear power career of the country.

The invention relates to a method for testing reaction torque. The method comprises the following steps of: fixing a stator shaft of a tested object on a static torque sensor through a coupler to acquire an electrical signal corresponding to the accurate micro torque value of the tested object; carrying out signal conditioning and data acquisition to the electric signal output by the sensor to accurately acquire torque data; and processing related data by a computer to acquire start torque, load torque and friction torque and calculating inertia time and synchronizing time. The reaction torque tester for realizing the method is provided with the static torque sensor, the coupler is fixed on the static torque sensor to acquire the accurate micro torque value of the tested object, and the accurate micro torque sensor is sequentially connected with signal conditioning and data acquisition systems and accessed in a computer processing system. By analyzing and researching tested characteristics and the test principle, the static torque sensor is selected to acquire the accurate micro torque value and accurately acquire the torque data through signal conditioning and data acquisition.

The invention discloses a kerbstone mechanical-hoisting and seam-spacing method-based construction method, a hoisting tool and a seam-spacing tool. The kerbstone mechanical-hoisting and seam-spacing method-based construction method comprises the following steps of 1, preparing construction, 2, carrying out measurement and line laying, 3, bracing 10-20m of a line and determining a kerbstone directional line and elevation line, 4, arranging a 1: 2.5-3 cement mortar cushion layer having thickness of 3cm, 5, installing first kerbstone, 6, arranging the seam-spacing tool, 7, hoisting kerbstone to a designated position by the hoisting tool, 8, carrying out complex line stabilizing, 9, carrying out self-inspection checking, 10, pouring back concrete of the kerbstone, 11,maintening the back concrete and 12, carrying out inspection and acceptance by a supervisor. The method provided by the invention has strong operationality and simple installation method with low technical difficulty, reduces kerbstone manual-carrying labor intensity, improves efficiency, saves a labor cost and has economic benefits better than those of the traditional construction method.

The invention relates to a method for evaluating performance of a multistage hydraulic jetting fracturing pipe column. A stress intensity safety factor mechanical analysis method is adopted mainly. Before jetting fracturing construction, combination, load, stress and deformation analysis on the multistage hydraulic jetting fracturing pipe column under static and dynamic working conditions is performed according to well completion production technical requirement specifications, mechanical property of the multistage hydraulic jetting fracturing pipe column under each working condition is accurately evaluated, and thus suggestions on parameters suitable for jetting fracturing pumping of each layer section are put forward, so as to achieve the purpose of evaluating pipe column safety in one time and guaranteeing construction safety. The method is suitable for evaluation on performance merits of the multistage hydraulic jetting fracturing fixed (or dragged) pipe columns of vertical wells and horizontal well, optimization of pipe column combination and oil testing fracturing construction design parameters can be guided, true and effective reference data is provided for underground pipe column performance detection, so that the pipe column stress safety factor is improved, and pipe column accidents are reduced.

The invention provides nanometer carboxylic acrylonitrile butadiene rubber modified epoxy resin, aiming at providing nanometer carboxylic acrylonitrile butadiene rubber modified epoxy resin which has high rigidity, tenacity and thermal endurance and can not lower the other properties thereof. The epoxy resin comprises the following components by weight percent: 8-15% of nanometer carboxylic acrylonitrile butadiene rubber, 72-80% of epoxy resin, 3-4% of dispersing agent, 3-5% of coupling agent, 1.5-2% of accelerator, 1.5-2% of defoamer and 1-2% of flatting agent. The epoxy resin is prepared by the method comprising the following steps: mixing the nanometer carboxylic acrylonitrile butadiene rubber and dispersing agent; activating the mixture and carrying out temperature control, speed regulation and anchor mixing; mixing the mixture with the other components, and presoaking; and then obtaining the epoxy resin by carrying out the three working procedures, namely coarse grinding, fine grinding and refined grinding.

The invention discloses a part making method and device, the part making method is as follows: when different colors of oxidation coloring of at least two regions in a part are needed, judging if a first region with a first gradient greater than a preset gradient exists in the least two region; when a judging result shows that the first region exists, obtaining a first standard specification size of the first region; according to the first standard specification size, generating an oxidation size larger than the first standard specification size; obtaining making parameters matching with the oxidation size; making the part based on the making parameters to enable the actual size of the first region to meet the first standard specification size after different colors of oxidation coloring of the part. By use of the method for oxidation size making of the part, the technical problem that color separation regions of different colors of oxidation coloring are limited by part shapes is solved, and the part shape and color design diversity are increased.

The application provides a method and a system for safety certificate and relates to the field of safety technologies. The method comprises a step of receiving a verification acquisition request triggered by a user; a step of generating elements to be selected and positional information of each element to be selected in a display interface according to the verification acquisition request, generating verification tasks corresponding to the elements to be selected and the positional information of each element to be selected in the display interface, and generating first matching data corresponding to the verification tasks; a step of sending the verification tasks to a mobile terminal corresponding to the verification acquisition request; a step of sending the elements to be selected and the positional information of each element to be selected in the display interface to a user terminal; a step of sending second matching data sent by the user terminal; and a step of comparing the second matching data with the first matching data and carrying out identifier recognition according to a comparison result. The application can completely improve safety during the user identifier recognition process and protect safety of user information.

The invention provides an intelligent voice anti-counterfeit product, which belongs to the anti-counterfeit technical field. The intelligent voice anti-counterfeit product is characterized in that: a dot matrix network is attached to the anti-counterfeit product; the dot matrix network corresponds to an anti-counterfeit digital code; the dot matrix network is identified by a scanner and processed into a group of digital codes; and the group of digital codes are compared with the anti-counterfeit code; and a comparison result is output through a voice. By the intelligent voice anti-counterfeit product, the intelligentization and the humanization of anti-counterfeit information can be realized; moreover, the intelligent voice anti-counterfeit product is difficult to manufacture, so the intelligent voice anti-counterfeit product is hardly copied; and the mode for searching the anti-counterfeit information is simple and easy.

The invention discloses a method for synthesizing n-decanal ester, comprising the following steps of: 1) carrying out acetalation on E-4-acetoxyl group-2-methyl-2-butene-1-aldehyde and trimethyl orthoformate or triethyl orhtoformate, then adding alkali to hydrolyze; 2) reacting a product obtained by the step 1) with vinyl ether; 3) hydrolyzing the product obtained by the step 2); 4) carrying out an Arbuzov reaction on triethyl phosphate and 2-chloropropionic acid ethyl ester in a mole ratio of 1: (1-1.6); 5) in the presence of sodium ethoxide, carrying out a wittig-Horner reaction on a compound obtained by the step 3) and the compound obtained by the step 4), and carrying out an elimination reaction at the temperature of 35-45 DEG C; and 6) oxidizing alcoholic hydroxyl in the compound obtained by the step 5) with TEMPO, thus the n-decanal ester product is obtained after the reaction is completed. All the raw materials adopted in the line of the invention are localized, the raw materials are available, technical difficulty is low, industrialized operation is simple, and industrialization prospect is good.

The invention discloses a grain depot remote monitoring system and method based on image encryption, and the method comprises the steps: segmenting a to-be-transmitted video frame before transmission,decomposing the to-be-transmitted video frame into a plurality of sub-images, randomly carrying out the encryption of each sub-image through employing a spatial domain image encryption technology ora compressed image encryption technology, packaging and transmitting the image encryption technology number corresponding to each sub-image at the same time, finally, obtaining each sub-image by usinga corresponding decryption technology according to the label of each sub-image and the corresponding image encryption technology number, and finally, splicing each sub-image according to the label ofeach sub-image to obtain an original video frame. According to the method, the sub-images are encrypted in a sub-image splitting mode and a random mode, so that the sub-images are cracked and restored by restoring each sub-image by using different types of decryption technologies, and then the disordered sub-images are restored, so that the technical difficulty of cracking and restoring is increased. Therefore, the security of data transmission is improved.

The invention provides nanometer butadiene-styrene-vinyl pyridine rubber modified epoxy resin, aiming at providing nanometer butadiene-styrene-vinyl pyridine rubber modified epoxy resin which has high rigidity, tenacity and thermal endurance and can not lower the other properties. The epoxy resin comprises the following components in percentage by weight; 8-15% of nanometer butadiene-styrene-vinyl pyridine rubber, 72-78% of epoxy resin, 3-4% of dispersing agent, 3-4% of coupling agent (also called as surface treating agent), 3-4% of accelerator, 1-2% of defoamer and 1-2% of flatting agent. The epoxy resin is prepared by the method comprising the following steps: mixing the nanometer butadiene-styrene-vinyl pyridine rubber and the dispersing agent; activating the mixture and carrying out temperature control, speed regulation and anchor mixing; mixing the mixture with the other components, and presoaking; and then obtaining the epoxy resin by carrying out the three working procedures, namely coarse grinding, fine grinding and refined grinding.

The invention discloses a lifting frame for hoisting of multiple components. The lifting frame comprises an upper frame fixedly connected with the bottom of a walking trolley on a travelling crane, a lower frame fixedly connected with a sling, and two four-connecting rod mechanisms, wherein the tops of the four-connecting rod mechanisms are hinged to the upper frame; the bottoms of the four-connecting rod mechanisms are hinged to the lower frame; the two four-connecting rod mechanisms are of the same structure and are parallelly arranged; middle connecting pieces are mounted at the middle parts of the four-connecting rod mechanisms; the middle connecting pieces are rectangular blocks with long strip-shaped sliding grooves; and hinge shafts at the bottom ends of upper connecting rods and at the top ends of lower connecting rods of the four-connecting rod mechanisms are mounted in the long strip-shaped sliding grooves of the middle connecting pieces in a sleeving manner. According to the lifting frame, swinging and shaking are prevented during the component hoisting, transfer and storage processes, all-dimensional stability is good, safety performance is high, the components are accurately placed during the transfer boxing process, operation time is saved, and working efficiency is improved.

The invention relates to a synthetic lubricating oil composition. The composition comprises the following components: 82.0 to 96.33 wt% of base oil, 3 to 10 wt% of ester oil, 0.1 to 3.0 wt% of an extreme pressure anti-wear additive, 0.02 to 1.0 wt% of a metal deactivator, 0.05 to 1.0 wt% of an antirust corrosion inhibitor, 0.5 to 3.0 wt% of an antioxidant additive and 10 to 200 [mu] g / g of an antifoaming agent; wherein the base oil is water-insoluble polyether polyalkylene glycol, and the ester oil is saturated polyol ester and / or polybasic acid ester. The lubricating oil composition has the advantages of excellent viscosity-temperature performance, excellent low-temperature performance, excellent oxidation stability, excellent high-temperature cleaning performance, excellent extreme pressure antiwear property, good rust and corrosion resistance and good foam resistance, and can quickly form an oil film, reduce the operation temperature, reduce the high-temperature coking property and reduce the wear between bearing tooth surfaces.

The invention discloses a screen content peep-proof method and device and a computer readable storage medium. The method comprises the following steps: detecting a touch operation of a finger of a user on a screen; determining a display area on the screen according to the touch operation; and performing peep-proof processing on the content outside the display area according to a preset mode. An existing peep-proof technology based on hardware is high in cost and large in technical difficulty, and according to the technical scheme, on the basis of existing mobile terminal hardware supporting the touch technology, information peep prevention can be easily achieved through the software technology without depending on other special hardware.

The invention discloses a preparation method of red, green and blue three-primary-color orthogonal up-conversion fluorescent safe ink and belongs to the technical field of nanometer optical anti-counterfeiting. The method comprises the following steps of: preparing nanoparticles with red, green and blue orthogonal up-conversion luminescence by using a full-automatic nano synthesizer through a layer-by-layer wrapping method; carrying out surface treatment on the obtained nanoparticles to obtain water-soluble nanoparticles; finally adding the water-soluble nanoparticles into an acid-base indicator according to a certain proportion, and carrying out uniform ultrasonic dispersion to obtain the safe ink. The safe ink prepared by the method can be used for obtaining an anti-counterfeiting pattern through printing, stamping, ink-jet printing, handwriting and the like; and the pattern obtained by the safe ink has the characteristics of three-primary-color fluorescence display, good pH stimulation responsiveness, good stability and the like, and can be used for multistage anti-counterfeiting application.

The invention discloses a method for synthesizing decyl acetal aldehyde. The method comprises the following steps of: 1) performing acetalation reaction of E-4-acetoxy-2-methyl-2-butene-1-aldehyde and trimethoxymethane or triethyl orthoformate, and adding alkali for hydrolyzing; 2) reacting the obtained product with a vinyl ether compound to obtain a product, and reacting the product with an allyl ether compound; 3) adding the product obtained in the step 2) into alkaline solution, and reacting at the temperature of between 30 and 50 DEG C for 1 to 5 hours; and 4) oxidizing alcoholic hydroxyl of the compound obtained in the steps 3) to obtain a final decyl acetal aldehyde product. In the method, all raw materials related in a route are subjected to domestication and are low in cost, and the method is small in technical difficulty and easy to operate industrially and has a bright industrial prospect.

The invention relates to an application of a beta chemokine receptor inhibitor or a composition comprising the beta chemokine receptor inhibitor in preparing a medicine used for treating inherited retinal diseases or for protecting inherited retinal degeneration photoreceptor cells. The beta chemokine receptor inhibitor blocks the combination of beta chemokine and the receptor thereof, and further blocks the signaling pathways after receptor activation and the caused oxidative damage reaction, so as to treat the inherited retinal diseases or to protect the inherited retinal degeneration photoreceptor cells. Preferably, the beta chemokine receptor inhibitor is administrated through vitreous cavity injection. Preferably, the beta chemokine receptor inhibitor is selected from met-RANTES. Preferably, the disease is inherited retinal degeneration. The intervention of the beta chemokine receptor inhibitor against inherited retinal degeneration diseases is substantially made earlier. Therefore, the application is an ideal means for treating early-stage RP. According to the application, a specific gene defect type is not considered. The beta chemokine receptor inhibitor provided by the invention has the advantages such as better practicality, wider application, and the like.

The invention provides a rice doubled haploid breeding method based on a haploid inducer and belongs to the technical field of agriculture. According to the method herein, a rice three-line maintainermaterial is hybridized with a rice material having a dominant red rice gene, a red rice maintainer carrying the dominant red rice gene are attained by screening, the red rice maintainer is subjectedto chemical directional induction, a mutant with a centromere mutant gene function is attained by screening, and the mutant is hybridized with a rice three-line sterile line to obtain a maintainer andsterile line carrying the red rice gene and centromere mutant gene; a hybrid F1 prepared according to breeding targets is hybridized with a red rice haploid induced sterile line before colorless-coathybrid seeds are retained; the colorless hybrid seeds are treated with colchicine to obtain a diploid material, namely, a novel line is formed. The rice doubled haploid breeding method based on the haploid inducer allows a homozygous gene to be attained quickly, helps overcome the defect segregative generations in traditional breeding are long, and is applicable to rice breeding.

The invention discloses a self-repairing active defense type true random number generation method. A physical quantity in a natural world is taken as input of a random quantity. Statistical test operation and judgment are carried out according to the input random quantity and a random state value. A statistical result is used for updating related parameters of an adaptive random state prediction function and updating the random state value. If the statistical result is consistent with a threshold, the random state value is updated. If the statistical result is inconsistent with the threshold,intrusion alarm is triggered. The random state value is updated according to the adaptive random state prediction function. A true random number is output based on the updated random state value according to a key derivation function. The method is applicable to generation of the true random number of an Internet of things resource-constrained node. Intrusion sensing alarm is carried out on the node. When the physical quantity of the node is collected unsuccessfully or the node is attacked, active reparation or defense is realized through utilization of the adaptive random state prediction function. Reliability or intrusion difficulty of the node is improved. Relatively much coping time is gained for network security management.