4619results about How to "Mature technology" patented technology

The invention relates to a nonpolar A side nitride film that comprises a silicon (102) underlay, metal layer which grows upon the silicon underlay sequentially, InGaAlN initial growth layer and the first InGaAlN buffer layer, it characterized in that: said silicon underlay is Si underlay which adopts the (102) side or offset angle. The nonpolar a side nitride film which grows on the silicon underlay can be used in LBD, laser, solar battery. The component extension configuration is adopted according to different component, for example the LBD and laser, and using the mature silicon craft further to produce relative diprosopia electrode component or peeling off component. The advantages of the invention are: the invention can increase the growth quality of nonpolar GaN base material, and decrease the cost; the craft of current component can be simplified greatly, the cost can be decreased, and increase the elimination efficiency and lightening efficiency greatly.

The invention firstly discloses an oxidized graphene or graphene / inorganic particle core / shell material which is formed by electrostatic self-assembly, wherein inorganic particles are taken as the core of the material, oxidized graphene or graphene is taken as a shell layer, and the content of the oxidized graphene or the graphene is 0.1-2wt% of that of the inorganic particles. The invention alsodiscloses a preparation method of the oxidized graphene or graphene / inorganic particle core / shell material. Therefore, a new species is added for outer-coated inorganic powder materials and the application space of the inorganic particles is expanded; furthermore, the electrostatic self-assembly technology is further applied to the preparation of the oxidized graphene or graphene-inorganic powderhybrid material, and the method simultaneously has the characteristics of being mature and environmentally-friendly in process, being simple to operate, having no need of complex equipment, being easy for realization of large-scale production and the like.

The invention relates to high-salt complex wastewater reuse and zero discharge integrated equipment and a technology. The equipment provided by the invention comprises a pretreatment system, a reuse and reduction system and a zero discharge system. The technology comprises the following steps: carrying out homogenization and averaged quantity on high-salt complex wastewater, successively adding sodium hydroxide, sodium carbonate, PAC and PAM to carry out coagulation treatment, letting a mixed liquor which has undergone coagulation treatment enter a filter tank for sedimentation and filtration by the use of an immersed microfiltration membrane, letting a supernatant enter a reverse osmosis treatment process, letting pure water obtained by reverse osmosis treatment enter a reuse water tank for utilization, further condensing condensed brine, and crystallizing the condensed brine or putting the condensed brine into an evaporation pond for atomization and evaporation processing, wherein the reverse osmosis treatment adopts three-level RO: a medium-pressure membrane element is firstly used for desalination and condensation; a high-pressure membrane element is then used for further desalination and condensation; and a ultrahigh-pressure membrane element is finally used for further desalination and condensation. According to the invention, 95% of reverse osmosis concentrated water or analogous high-salt complex wastewater can be recovered for reutilization, only 5% of high strong brine is left to undergo evaporative crystallization or enter the natural evaporation pond. Water resources are fully recycled, and reuse and zero discharge costs of high-salt complex wastewater are reduced.

The invention discloses a radar-infrared combined stealth material and a preparation method thereof. The radar-infrared combined stealth material orderly comprises a metal-type capacitive frequency selection surface layer, a middle medium layer, a resistance-type capacitive frequency selection surface layer and a medium base layer from top to bottom. The metal-type capacitive frequency selection surface layer and the resistance-type capacitive frequency selection surface layer have matrix structures. The metal-type capacitive frequency selection surface layer adopts metals having low infrared emissing ability. The middle medium layer and the medium base layer have dielectric constants of 3-10 and dielectric loss of 0.01 to 0.50. The preparation method comprises the following steps of preparing a metal film by screen printing processes, carrying out etching of the metal-type capacitive frequency selection surface layer on the metal film by a PCB technology, preparing the resistance-type capacitive frequency selection surface layer on the medium base layer by the screen printing processes, and binding the layers into an integral body by a binder by the vacuum bag molding process. The radar-infrared combined stealth material has a simple structure, is light and thin and has a good stealth effect.

The invention discloses a method for preparing a low-carbon olefine catalyst by a loading iron-based synthetic gas, which comprises the following steps of: firstly carrying out surface modification on a silica gel carrier by using silica gel as a carrier, and then loading a metal auxiliary agent and an active component Fe by using an immersion method, wherein the surface modification method of the silica gel carrier comprises the following step of carrying out immersion treatment by using the acidic solution of sugar. After the silica gel carrier adopted is modified, the strong interaction between the carrier and the active component is overcome, and the activity and the selectivity of the catalyst are improved. The catalyst prepared by using the method is suitable for a reaction process of producing low-carbon olefines of ethylene, propylene, butane and the like by the synthetic gas.

The invention relates to a self-repairing polyurethane hydrogel and a preparation method thereof. The polyurethane hydrogel comprises the following components in parts by mass: 10-30 parts of polyisocyanate, 30-50 parts of hydrophilic polyester polyol or hydrophilic polyether polyol, 10-50 parts of acrylamide monomer, 0.5-3 parts of chain extender, 3-10 parts of methacrylic acid functional monomer containing an UPy unit, 0.5-2 parts of catalyst and 0.5-3 parts of photoinitiator. The preparation method comprises the following steps of firstly preparing a hydrophilic polyurethane macromonomer terminated with an acrylic acid monomer and carrying out radical polymerization with the methacrylic acid functional monomer containing the UPy unit under the action of photo-initiation. According to the self-repairing polyurethane hydrogel, the self-repairing of the damage of the polyurethane hydrogel can be completed without need of any repairing agent or specific environmental requirements, the polyurethane hydrogel has the advantages of high repairing efficiency, high mechanical strength and low cost and the repeatedly repairing function can be achieved on the same site.

The invention provides an intelligent electronic label system which uses a highly integrated and low cost wireless micropower single chip transceiver to manufacture an intelligent label and a reader-writer respectively. The intelligent label is in a dormant state for a long time and works for an instant after a periodical revival, the reader-writer seizes the instant after the intelligent label is revived to establish a communication contact with the intelligent label through different modes, thereby realizing control management of a system to the intelligent label and other terminal devices connected with the intelligent label with very low average power consumption. The invention also makes that a common button cell battery is not necessary to replace for a plurality of years through flexible regulations to the dormant cycle of the intelligent label, an operating channel, an operation mode, etc. Meanwhile, the invention also greatly accelerates response speed of the intelligent label. The intelligent electronic label system has a simple structure, a long reading and writing distance, low cost, and flexible and convenient use; therefore, intelligent electronic label system can be used as a wireless electronic vehicle license plate, an identification card, etc., and can be used for control management to vehicles, staffs, materials and other remote terminal equipment.

The invention disclose a new positioning method of a distribution network single-phase earth fault, which is applicable to a 3-60 kV neutral point ineffective earth grid. The principle of the positioning method is that: firstly, a high-voltage DC signal is poured into a circuit starting end and the DC signal is detected along the circuit so as to determine a fault area; then a high-voltage AC signal is poured into the circuit starting end, and the AC signal is detected along the circuit so as to determine the position of a fault point. A positioning device developed on the basis of the invention consists of two parts: a high-voltage signal source and a signal detector, wherein, the high-voltage signal source consists of a voltage inverter, a constant flow source, a transformer and a rectifier bridge and is used for pouring a high-voltage DC signal and a high-voltage AC signal; the signal detector comprises a DC detector and an AC detector, wherein, the DC detector consists of a Hall DC detector, a Bluetooth wireless sender and a Bluetooth wireless receiver and is used for measuring the DC signal; while the AC detector consists of an AC electromagnetic field inductor and a signal processing and display segment and is used for measuring the AC signal. The method and the device have mature technique and high reliability.

The invention discloses a multifunctional intelligent clothing care machine. The machine is characterized by comprising a box body, wherein an air exhaust port is formed in the top part of the box body; a water tank and a water draining box which intercommunicate are arranged at the bottom part of the box body; a recognizing module, a washing module, a drying ironing or hanging ironing module provided with an intelligent algorithm system, and a caring module are arranged in the box body and are connected to an information storing and control module. According to the multifunctional intelligent clothing care machine, proper clothing stain removing program, washing program, drying program, ironing or hanging ironing program and casing program are accurately set; the clothing information recognizing and the stain type recognizing are intelligently combined; the care efficiency can be increased based on washing protecting models and intelligently-matched caring program, and meanwhile, the damage to the clothing appearance and physical and chemical performances can be decreased to the maximum. Therefore, common clothing and high-level clothing can be handled, and moreover, some clothing to be subjected to dry cleaning can be handled. The machine is high in automation degree; after a use puts clothing into the machine, the machine can automatically perform all tasks such as washing, drying, ironing and caring.

The invention provides a preparation for the in-situ compounding simple-substance nano silvery bacteria cellulose membrane, and relates to the biological medical material field, characterized in that the bacteria cellulose membrane has special three-dimensional nano network structure, the silver-ammonia solution reacts with the chemical agent containing aldehyde group to generate silver simple-substance nano particle in situ in the network structure. In addition, in the invention, the special drying method is adopted to improve the defect of big fragility of the prepared silver-contained nano bacteria cellulose dry membrane. The bacteria cellulose membrane containing simple-substance nano silver particle provided by the invention has excellent antibacterial performance and simple preparation technique, and can be widely used in the biological medical field such as large-area wound dressing, bundling belt and the like, also can be used in the industry field such as the preparation of nano silver particle and silver catalyst, and the like.

The invention discloses a method for preparing a modified regenerated cellulose / alginate hemostatic composite material, and relates to a method for preparing a hemostatic material, belonging to the technical field of biomedical composite materials. The invention aims to solve the technical problem that an existing alginate material has an unsatisfactory hemostatic effect, poor structure integrity, and relatively low mechanical strength and stability. The method comprises a first step of modification of regenerated cellulose; a second step of preparation of an oxidized regenerated cellulose / sodium alginate water solution; a third step of molding of the hemostatic composite material; and a fourth step of cross-linking and solidification of the hemostatic composite material. According to the modified regenerated cellulose / alginate hemostatic composite material, due to the introduction of a sodium carboxylic acid structure at the C6 site of the regenerated cellulose molecule through the selective oxidization of a TEMPO-NaClO-NaBr oxidation system, the hemostatic property, structure integrity, mechanical strength and stability of the modified regenerated cellulose / alginate hemostatic composite material are improved, and the defects of poor wet strength, low mechanical integrity and easy deformation of ordinary alginate non-woven fabrics are overcome.

The invention discloses an aerated concrete cutting machine. The machine comprises vertical posts, I-shaped girders and a frame, wherein the I-shaped girders are erected on the vertical posts; the frame consists of a cross beam which is positioned above the vertical posts and is fixed with the girders; an overturning platform is arranged at the middle position of the frame; a vertical cutting device which does up-and-down lifting motion is arranged between the two vertical posts in the middle of the frame; a horizontal cutting device which moves along the longitudinal direction of a blank body is arranged between the two girders; and a scrap edge cleaning device is arranged beside the overturning platform. The cutting machine integrates machines, electricity and liquid, has a compact structure, small occupied space, complete functions, high cutting accuracy and a clean and tidy operation field environment, has various functions of automatically longitudinal cutting, transverse cutting, hexahedral cutting, tetrahedral scalping, two-sided peeling, automatic scrap edge cleaning, specially-shaped brick cutting and the like, makes cutting dimensions conveniently adjusted, and reduces the labor intensity of operators due to humanized designs.

The invention discloses a silicon-based hybrid integration laser radar chip system. According to a light path sequence, the transmitting terminal of the system comprises a tunable narrow linewidth laser source, a silicon nitride beam splitter, a silicon-based phase shifter array and a silicon nitride one-way transmitting antenna array in sequence. According to a principle that the light path is reversible, the receiving terminal of the system comprises a silicon nitride one-way receiving antenna array, a silicon nitride beam splitter and a silicon-based coherence receiving module in sequence and also comprises a backup system and an electric domain control processing module. Each module on a silicon platform and a silicon nitride platform realizes multilayer single-chip integration with the help of a silicon / silicon nitride evanescent wave coupler, and a gain chip in a tunable laser source module and silicon nitride waveguide are subjected to hybrid integration through horizontal coupling. By use of the system, through multi-platform multi-field hybrid integration, the high-speed flexible wave beam formation, rotation and directivity receiving of a free space laser signal can be realized in a phased array way. The system does not contain movable devices, and has high integration density, good CMOS (Complementary Metal-Oxide-Semiconductor Transistor) compatibility, low large-scale volume production cost and extremely high practical value.

The present invention relates to one kind of high molecular weight polybutanediol succinate and its preparation process, and features that bihydroxy terminated butanediol succinate, especially low molecular weight bihydroxy terminated butanediol succinate, as the pre-polymer and diisocyanate as the chain extender in 0.1-13 % are molten and reacted to prepare polybutanediol succinate with low cost, great molecular weight, narrow molecular weight distribution and excellent mechanical performance. The polybutanediol succinate has number average molecular weight greater than 5.5x10<4>, molecular weight distribution of 1.4-1.8, tensile strength of 39-58 MPa, and elongation at break of 300-700 %.

The invention relates to a preparing method of a transparent electrode based on a metal nanometer grid. The method comprises the following steps that (1) photoresist coats a silicon substrate in a spin-coating way and is baked; (2) exposure and development are carried out, and the photoresist is etched into a nanometer grid pattern on the silicon substrate; (3) a metal layer is deposited on the photoresist of the nanometer grid pattern; (4) the photoresist is removed through stripping, and a metal nanometer grid formed on the silicon substrate is obtained; (5) bonding agents coat the metal nanometer grid in a spin-coating way, and in addition, a transparent substrate is adhered and cured; (6) the silicon substrate is removed through corrosion, and the transparent electrode based on the metal nanometer grid arranged on the transparent substrate is obtained. The method is simple, the implementation is easy, the integration and the large-scale production are easily realized, and the electrical conductivity and the light transmittance of the prepared transparent electrode are controllable.

The invention provides a fitness effect evaluation system based on an electromyographic signal and body movement detection and belongs to the technical field of fitness evaluation, aiming at solving the problem that a result is not accurate when the fitness effect is evaluated according to subjective intention. The fitness effect evaluation system comprises a signal acquisition part and a cell phone APP part, wherein the signal acquisition part comprises an electrode, an electromyographic sensor, a controller, an acquired signal wireless transmission module and an accelerated speed sensor; the cell phone APP part comprises a processing signal wireless transmission module, a processor and a user module; a positive pole end and a negative pole end of the electrode are conducted with a to-be-detected target; a right leg driving electrode of the electrode is arranged at a tested part of the to-be-detected target. By detecting and analyzing an electromyographic signal, a body movement speed and an accelerated speed, the fitness effect is evaluated; the description of the fitness effect is relative to muscle fatigue degree and exercise quantity; information feedback and data management are carried out through a cell phone APP. The fitness effect evaluation system based on the electromyographic signal and the body movement detection is used for evaluating the fitness effect.

The invention discloses polyimide fiber with benzimidazole structure, which is characterized in that the infrared spectrum of the fiber is provided with character absorption peaks of imide ring of 1776-1774cm<-1>, 1726-1722cm<-1> and 1378-1373cm<-1> within the wave number range of 1300-1800cm<-1> and N-H functional group absorption wide peaks in the imidazole structure within the wave number range of 3000-3750cm<-1>. The tensile strength is 0.73-1.53GPa. The initial modulus is 45.2-220GPa. The invention also provides a preparation method of the fiber. The fiber disclosed by the invention contains the benzimidazole structure with secondary amine hydrogen. Therefore, compared with PMDA-ODA polyimide fiber prepared with the same process, the tensile strength can be improved by nearly three times at the most, the initial modulus can be improved by more than twenty times at the most, and the heat resistance is further improved. The preparation method provided by the invention has the advantages of mature technology and easy control. The cost can be kept at a relative low level.

The invention discloses a three-phase separation and waste water purification standard treatment device of kitchen waste including 'waste oil', solid waste and kitchen waste water. The three-phase separation and waste purification standard treatment device of the kitchen waste including the 'waste oil', the solid waste and the kitchen waste water is mainly composed of a shell body, a solid-liquid separation chamber, a filtering bag with meshes, a liquid level displayer, an oil-water interface detector, a numerical control electric valve which discharges the 'waste oil', a flowmeter of the 'waste oil', a collection tank of the 'waste oil', a blower, an air heating device, a filtering tank, a drug adding tank and the like. According to the three-phase separation and waste water purification standard treatment device of the kitchen waste including the 'waste oil', the solid waste and the kitchen waste water, oil and water separation and waste water purification are carried out in the same device, an equipment structure is simplified, the water quality after being purified is in line with each indicator of 'water quality standard of sewage discharged into the city sewer' (CJ3082-1999), The three-phase separation and waste purification standard treatment device of the kitchen waste including the 'waste oil', the solid waste and the kitchen waste water has the advantages that the size is small, the investment is low, either manual or automatic operation is available and the like, and obvious creativity, novelty and good industrial applicability are provided.

The invention relates to a dual-component sulfhydryl-terminated polyurethane mildew-proof sealant and a preparation method thereof, wherein, the sealant consists of component A and component B, wherein, according to the parts by weight, the component A comprises 80-120 parts of sulfhydryl-terminated polyurethane liquid rubber, 20-200 parts of filling material, 10-100 parts of plasticizer, 0.5-10 parts of tackifier, 0.1-5 parts of mould inhibitor, 0-5 parts of vulcanization regulator, and 0-5 parts of antioxidant; the component B comprises 80-120 parts of vulcanizing agent, 20-150 parts of plasticizer, 20-200 parts of filling material, and 0-5 parts of vulcanization regulator; and the proportion of component A and component B is 10:0.5-2. The mildew-proof sealant has the tensile strength of 5.0MPa, breaking elongation rate of 1020 percent, the bonding strength with the concrete of 2.5MPa, and the mildew-proof level of being less than or equal to 1; the sealant can be used for the fields such as electrons, mechanicals, and the like, can meet the sealing and mildew-proof requirement under the conditions of long-term water immersion, damp-heat or other conditions where mildews are easy to breed, has no exhaust of three wastes and is friendly to environment.

The invention discloses a self-repairing polyurethane coating and a preparation method thereof. The polyurethane coating comprises the following raw materials in parts by mass: 15-20 parts of polyisocyanates, 40-60 parts of hydrophilic polyester polyol or polyether polyol, 2-3 parts of a chain extender and 7-15 parts of methylcystein. The preparation method comprises the following steps: preparing a hydrophilic polyurethane prepolymer from hydrophilic polyester polyol or polyether polyol and the chain extender, and reacting the isocyanate group in the hydrophilic polyurethane prepolymer with methylcystein, so as to obtain a polyurethane material of which the tail end or the main chain contains 2-urea-4-pyrimidone units; spraying or coating the polyurethane material on the surface of a substrate, thereby obtaining the self-repairing polyurethane coating. The self-repairing of the self-repairing polyurethane coating disclosed by the invention can be completed without external repairing agent or requirements of special environment, the coating is good in transparency, high in strength, good in filming property, simple in process and low in cost, and the function of repeated repairing in same positions can be achieved.

The invention provides an online low-current earth fault positioning method and positioning device based on a BP neural network and by means of a multi-source data fusion algorithm. Due to the fact that terminals arranged on different positions on a circuit accurately catch zero-sequence current transient signals of zero-sequence currents which exceed a starting value before a previous period of a starting value and after four periods of the starting value, signal characteristics of a fault transient signals are extracted by means of a Prony algorithm, a wavelet packet algorithm, an HHT algorithm and a fractal algorithm, the characteristics extracted by the algorithms are analyzed by means of the BP neural network, and a zone where a fault occurs is determined. The positioning device comprises a terminal and a main station, wherein the terminal is arranged on an overhead line tower or in a cable ring main unit, the input end of the terminal receives a zero-sequence current signal synthetized by a phase current signal of a CT secondary side of a power distribution circuit including an overhead line and a cable, the terminal is connected with the main station through optical cable communication or mobile communication, and the main station is arranged in a transformer substation or a dispatch center, comprises an optical cable communication module and a mobile communication module and receives a signal sent by the terminal. The method and the device are mature in technology and high in reliability.

The invention discloses an active reflection coefficient test system and method of a phased array antenna. The test system comprises a vector network analyzer, a multichannel amplitude phase control auxiliary unit, a signal extraction auxiliary unit, a master control computer, a calibration member and an amplitude-stabilizing phase-stabilizing cable, wherein the vector network analyzer is configured to generate test excitation signals and receive reference, reflection and monitoring signals; the multichannel amplitude phase control auxiliary unit is configured to convert one path of excitation signals into M paths, control the amplitudes and phases of the M paths of signals independently, and output M paths of amplitude and phase controllable excitation signals; and the signal extraction auxiliary unit is configured to realize straight-through output of the M paths of amplitude and phase controllable excitation signals, carry out reference coupling, monitoring coupling and reflection coupling extraction on the M paths of amplitude and phase controllable excitation signals, and implement switching control and selective output. The test system can directly test the active reflection coefficient of the antenna unit needless of calculation, the test process is concise, manual operation is less, and the test result is highly correct.

The invention discloses a high-resilience self-repair high-polymer aquagel and a preparation method thereof. The high-resilience self-repair high-polymer aquagel is prepared from the following raw materials in parts by mass: 15-20 parts of polyisocyanate, 40-75 parts of hydrophilic polyester polyol or hydrophilic polyether glycol, 1-5 parts of acrylate monomer, 10-15 parts of acrylamide monomer, 0.5-2 parts of chain extender, 1-3 parts of surfactant, 0.1-1 part of alkyl acrylate monomer and 0.5-2 parts of catalyst. The preparation method comprises the following steps: preparing an acrylate-monomer-terminated hydrophilic polyurethane high-polymer monomer self-assembly and an alkyl acrylate micelle; and carrying out radical copolymerization with acrylamide monomer under the photoinitiation action. The obtained self-repair high-polymer aquagel can complete self repair on self damage without any repair agent or specific environment, and has excellent resilience and physical and mechanical properties.

The invention relates to a realization method based on the CPCI bus technology of the dual module hot spare system switching. The realization method is characterized by comprising the following steps: 1) the cabs at the head and tail of a train are separately provided with an ATP and two ATOs, the ATP adopts 2-out-of-3 architecture, the same ATOs (ATO1, ATO2) are hot spares to each other; 2) when the train runs normally, only the ATPs and ATO of the front head cab in the advancing direction work, the tail cab is powered off; when the train enters a turning section, a driver in the head cab of the original advancing direction presses an AR button on the driving platform to power on the ATPs and ATO of the tail cab; the ATPs and ATO of the head cab and the ATPs and ATO of the tail cab exchange information, the driving privilege is exchanged according to the driving direction so that the original tail cab is reversed to become the head cab, the ATPs and ATO of the original head cab are powered off; and 3) the redundancy automatic switching of one ATO adopts the dual module hot spare mode. The system of the invention has simple hardware configuration, lower system cost and abundant interfaces and is convenient to test and debug.

The invention relates to a ferrum (Fe)-based amorphous alloy material, in particular to a Fe-based amorphous alloy strip for treating printing and dyeing wastewater and a preparation method thereof. According to the conventional literatures and technical data, an alloy component with Fe-based amorphous alloy strip forming capacity is selected; and general requirements show that the selected alloy component comprises more than 50 percent of Fe atoms, preferably 60 to 85 percent, so the reduction decoloring capacity of the Fe atoms is exerted. The amorphous alloy strip is obtained by adding a small amount of other elements and performing rapid solidification by using melt spinning equipment. The decrystallization of zero-valent Fe is realized by preprocessing technology; the decoloring capacity of the Fe atoms is kept; the rusting consumption of the Fe in the wastewater treatment process is effectively reduced; the strip is repeatedly and persistently utilized on the premise of guaranteeing the decoloring rate; the technical defects and the application defects in the conventional method for treating the printing and dyeing wastewater by using reducing Fe powder or waste cast Fe scraps are overcome; and the Fe-based amorphous alloy strip relates to the field of potential application of decrystallization technology in the industrial field, and has an extremely high application prospect.

The invention relates to a circuit breaker and a realization method thereof, and particularly relates to a high-voltage DC circuit breaker and a realization method thereof. The DC circuit breaker, based on a secondary current transferring principle, comprises a main branch, a current transferring branch and an energy absorption branch in parallel connection. The DC circuit breaker is serially connected in a DC system. The main branch comprises at least one high-speed mechanical switch K and at least one current transferring module comprising a fully-controlled device in serial connection. The current transferring branch is a bridge circuit formed by thyristor valves, inductors and capacitors. The energy absorption branch is formed by a non-linear resistor. The invention also provides a high-voltage DC circuit breaker realization method. The circuit breaker provided by the invention has a simple topological structure, the control is simple and convenient, used power electronic devices are mainly half-controlled thyristors, the technology is mature, realization is easy, the current breaking ability is large, a voltage-withstanding grade is high, the extension ability is strong, and the cost is greatly reduced.

The invention provides a method for quickly detecting melamine in a milk sample based on nanogold, which aims to solve the problems of the high operation requirement, complex detection process, high cost, long time, incapacity of meeting a lot of food test requirements and the like on the detection of the melamine. The method comprises the following steps: performing pretreatment on the milk sample and adding the pretreated milk sample into a nanogold solution; and adopting visual colorimetry to compare the color of the nanogold added with the sample solution with the color in a color standard series and then qualitatively judging whether the milk contains the melamine or not. The color standard series is prepared through the following steps: adding the pretreated milk samples in an identical volume and containing the melamine of different concentrations into the nanogold solution, wherein the content of the nanogold in each sample is consistent; and after color development reaction, obtaining the color standard series. The method has the advantages of low cost, simple and convenient operation and capacity of visually and quickly detecting the melamine in the milk.

The present invention discloses one kind of high temperature resistant ceramic cooker suitable for use in electromagnetic induction furnace. The high temperature resistant ceramic cooker is produced with the main materials, including lithium-containing mineral material, quartz, kaolin, etc, and through grinding, mixing, forming, drying, glazing and high temperature baking to obtain the ceramic body; coating far infrared radiation layer, electromagnetically inducing eddy flow heating layer and far infrared reflecting layer to the bottom of the ceramic body; and roasting. It has high heat stability, no cracking even in no-water cooking state, high heat utilization rate and long service life. It is especially suitable for cooking in electromagnetic induction furnace.

The invention belongs to the technical field of superconduction and particularly relates to an uninsulated superconducting magnet. The uninsulated superconducting magnet comprises a coil framework and a superconducting wire wound on the coil framework, wherein the surface of the superconducting wire is free from an insulating layer or is wrapped with an incomplete insulating layer, a mixture of an electroconductive material, a heat-conducting material, a curing material and a wetting material is filled among the turns of the superconducting wire, the inter-turn resistance is 0.1ohm-100kilohm, and in terms of volume percentage of all materials, the uninsulated superconducting magnet comprises 0.01-99.9% of the electroconductive material, 0-99.9% of the heat conducting material, 0-99% of the curing material and 0-5% of the wetting material. According to the uninsulated superconducting magnet disclosed by the invention, electroconductive components are filled in each turn of the superconducting coil so that the inter-turn resistance is maintained higher, not only is the inter-turn uninsulated characteristic brought into play, but also the charging excitation and the quench protection of the superconducting magnet are facilitated.

The invention discloses a method for preparing porous compound type high permeability absorption hemostasis coating with modified nano-crystalline cellulose, and belongs to the field of biological medical materials. The method comprises the following steps of: pre-processing bacterial cellulose by alkali water at high temperature to remove endotoxin; scattering the obtained bacterial cellulose under a high-speed bacterial pulverizer to be fine fibers; performing alkalization treatment on the fine fibers by alkali liquid with the proper concentration to activate the cellulose; adding an etherifying agent grafted modified bacterial cellulose to ensure that the fiber has a certain hemostasis function; uniformly compounding the modified bacterial cellulose with sodium alga acid to form gel network by ion crosslinking; and freezing and drying the gel network to obtain the hemostasis compound material with good performance. The porous compound material prepared by the method is a good medicine carrier, which can carry the medicines capable of resisting bacteria, stopping the pain and coagulating blood, so that the material has good medicine sustained release effect under different PH values. The porous compound material is high in biocompatibility and cell affinity, can promote proliferation and differentiation of stem cells, and facilitates rapid recovery of damaged tissues.