197results about How to "Wide range of temperature adaptation" patented technology

The invention relates to a photo-induced reversible self-repair polyurethane film and a preparation method and a repair method thereof. The polyurethane film mainly comprises 10 to 40 parts of phenolic hydroxyl coumarin derivative, 10 to 50 parts of alkyl bromal compound, 10 to 40 parts of polyisocyanate, and 10 to 30 parts of polyether polyol or polyester polyol. The preparation method comprises the following steps of: generating phenolic hydroxyl coumarin by using the phenolic hydroxyl coumarin derivative and the alkyl bromal compound under the action of absolute potassium carbonate; and reacting the phenolic hydroxyl coumarin, the polyisocyanate and the polyether polyol or the polyester polyol to obtain polyurethane solution, and performing cross linking under the irradiation of ultraviolet with wavelength of 350 nanometers after the film is formed to obtain the polyurethane film. The damaged surface is irradiated through the ultraviolet with wavelength of 254 to 350 nanometers, so that the reduced coumarin monomers are subjected to dimer cross linking reaction again and the purpose of repairing cracks is fulfilled. Compared with the prior art, the polyurethane film has the characteristics of good film forming property and high transparency; and the repair process is simple and has low cost.

The invention discloses a fungal alpha-amylase-containing beer complex enzyme and a preparation method thereof, belonging to the field of enzyme preparation processing. The high-activity fungal alpha-amylase and other food grade enzyme preparations, plant extracts, antioxidants, protective agents, activating agents and the like can be scientifically compounded by taking concentrated maltase and concentrated malt juice powder as main raw materials; the prepared beer complex enzyme is complete in proteases, high in enzyme activity, difficult to deactivate, mellow in malt aroma, and capable of providing abundant nitrogen source for malt juice, wherein the activity of fungal alpha-amylase in fermenting liquor during the preparation of fungal alpha-amylase is 17000-21000 U / mL. The complex enzyme can be stored for 12 months under the conditions of 0DEG C and 40DEG C, the single enzyme activity loss in the complex enzyme are respectively 0.50% and 0.72%, the enzyme deactivation caused by environment change, and inappropriate operation methods during packaging, storage, transportation, use and the like can be effectively prevented, especially the enzyme deactivation caused by high temperature can be prevented.

The invention relates to the technical field of ceramic bricks, in particular to a dry granular decorative ceramic brick with a strong three-dimensional effect and a manufacturing method thereof. Themanufacturing method comprises the following steps that A, ground coat decoration is carried out, specifically, the surface of a blank body is subjected to the ground coat decoration; B, pattern decoration is carried out, specifically, the temperature of the blank body is controlled within 40 DEG C-60 DEG C, and then the ground coat surface of the blank body is subjected to the pattern decoration;C, drying is carried out, specifically, the blank body after being subjected to the pattern decoration is dried; D, dry granular decoration is carried out, specifically, dry granules are spread on the surface of the dried blank body; E, protective glaze spray coating is carried out, specifically, the surface of the blank body after being subjected to dry granular decoration is subjected to the protective glaze spray coating; and F, firing is carried out, specifically, the blank body after being subjected to the protective glaze spray coating is fired. According to the manufacturing method ofthe dry granular decorative ceramic brick with the strong three-dimensional effect, the operation steps are simple, control is convenient, the production efficiency is high, and the production cost islow; according to the prepared ceramic brick products, the pattern is clear, the gradation is distinct, the glaze surface glossiness is low, the skid resistance effect is good, the dry granular senseis obvious, the three-dimensional effect is high, the color is abundant, the performance is stable, and the manufacturing method can be applied to industrialization mass production.

The invention discloses a PTC (Positive Temperature Coefficient) rare-earth thick-film-circuit intelligent electric-heating element and a preparation method thereof. The intelligent electric-heating element is characterized by comprising a metal substrate as well as a PTC thick film circuit thermistor and a rare-earth thick film resistance circuit which are arranged on the metal substrate, wherein the PTC thick film circuit thermistor is arranged in a thick film circuit way to be overlapped or positioned in a same plane with the rare-earth thick film resistance circuit to control the temperature of the thick-film-circuit electric-heating element, so that the control precision and sensitivity are improved substantially; or the PTC thick film circuit thermistor can be independently made into the controllable electric-heating element in the form of a thick film circuit. The intelligent electric-heating element disclosed by the invention can be started by low and high voltages as well as alternating and direct currents at present, is small in size, large in surface thermal load, high in thermal efficiency, quick in warm start, excellent in heat-conducting property, strong in thermal shock capacity and easy to process, green, low-carbon and environment-friendly as well as safe and reliable, has a far infrared function; moreover, the temperature fields are uniform and self-controlled level by level; therefore the intelligent electric-heating element is widely applied to series products of novel intelligent electric-heating elements, such as solar cells, wind power cells, lithium ion cells and the like, with new energy requirements.

The invention discloses a multi-channel locomotive speed measurement hall revolution speed transducer and an installation method thereof. The multi-channel locomotive speed measurement hall revolution speed transducer comprises an induction module and a processing circuit board, wherein the processing circuit board comprises a power supply processing circuit and a signal processing circuit; after an external power supply input signal is processed by the power supply processing circuit, power is respectively supplied to the induction module and the signal processing circuit; the induction module comprises more than two groups of double-channel hall elements and is used for transmitting pulse signals induced and changing with the rotation of a speed measuring gear to the signal processing circuit; after the signal processing circuit is used for amplifying and shaping the pulse signals, the four processed signals are output to an upper computer. The locomotive speed measurement multi-channel hall revolution speed transducer can be used for solving the problems in the prior art that the high-speed speed measurement requirements of motor train units cannot be met, few number of channels are available and signals are not output during the low speed running of a locomotive. The multi-channel locomotive speed measurement hall revolution speed transducer is in non-contact with the speed measuring gear, free of abrasion, simple in a production debugging technology, convenient to install, large in induction air gap and wide in speed measurement range and temperature adaptive range and has strong vibration resistance and anti-disturbance performance.

The invention relates to emulsified asphalt for longitudinal connecting plate type ballastless track cement emulsified asphalt mortar. The emulsified asphalt comprises the following components in percentage by weight: 60 to 65 percent of asphalt, 0.2 to 5 percent of anionic emulsifier, 0.02 to 3 percent of stabilizing agent, 0 to 4 percent of assistant, and the balance being water; and the wax content of the asphalt is less than or equal to 2.2 percent. The emulsified asphalt for the longitudinal connecting plate type ballastless track cement emulsified asphalt mortar has good emulsifying effect, is not only suitable for storage and usage under normal temperature environment, but also suitable for storage and usage under the environment of lower temperature or higher temperature, and has the advantages of good storage stability, strong temperature adaptability and the like; and the cement emulsified asphalt mortar prepared by the emulsified asphalt has the advantages of long working time, large temperature adapting range, no layering, good filling property, good physical-mechanical properties, good durability, and the like. The emulsified asphalt is applied to a plate type ballastless track, and in particular the longitudinal connecting plate type (CRTS II type) ballastless tracks of high-speed railways and passenger dedicated lines.

The invention discloses a sodium alginate compound immobilized microbial agent and a preparation method thereof, and the sodium alginate compound immobilized microbial agent solves the problem that an immobilization way of pseudomonas suitable for di-chlorine quinoline acid degradation in the prior art is absent. A carrier culture medium with the pseudomonas and sodium alginate are mixed to obtain a mixture, and the mixture is dropwise added into calcium chloride with concentration being 1-4% to stand for 2-4 hours to prepare a granule; the mass concentration of the sodium alginate is 2-6%; the carrier culture medium comprises an adsorption carrier and an inorganic salt liquid culture medium; a weight ratio of the adsorption carrier to the sodium alginate is (1-3) to 1; and the adsorption carrier consists of corn cob, bamboo charcoal and oil cake in a weight ratio being 1:(1-2):1. According to the invention, the degradation efficiency of bacteria is effectively improved, and the degradation rate of the immobilized microbial agent is much higher than the sum of the physical absorption efficiency of blank spheres and biological degradation efficiency of a free bacterial strain, so that the effect of mutual promotion can be achieved.

The invention relates to the technical field of elevator parts, particularly to a novel elevator balance compensation chain which comprises a metal chain, wherein the metal chain is wrapped with a coating layer; an outer sheath is arranged outside the coating layer; a fiber layer is arranged outside the outer sheath. With the structure, the novel elevator balance compensation chain has the advantages of high strength, good elasticity, flexibleness, abrasion resistance and low temperature resistance and wide temperature adaptation range, can maintain flexibleness in a low-temperature environment to achieve a favorable balance compensation effect, is suitable for elevators at the speed of 3-4 m / s, is adapted to the environmental temperature of -50 to 60 DEG C and has a long service life.

The invention discloses a bra cushioning material by using thermoplastic rubber as the base, which is prepared from thermoplastic rubber, talcum powder, calcium carbonate or zinc oxide, petroleum series plasticizing agent, and amine antioxidants through the steps of mixing, thermal plasticizing, squeezing and granulating.

The invention relates to a desulfurization and denitration system by an ozone oxidation double-tower ammonia method. The desulfurization and denitration system sequentially comprises a hydrogen peroxide spraying device, a draught fan, an ozone spraying device, a flue gas mixing device, a front adsorption tower, a rear adsorption tower, a cyclone separator, a centrifugal separator and a drier, wherein the hydrogen peroxide spraying device is arranged at an outlet of a boiler coal economizer, the outlet of the boiler coal economizer is connected to the draught fan through an air preheater and a dust remover and is connected to the front adsorption tower; the ozone spraying device is mounted in front of an inlet flue of the front adsorption tower; and the flue gas mixing device is arranged between the ozone spraying device and the inlet flue of the front adsorption tower. The desulfurization and denitration system disclosed by the invention has the beneficial effects that the integration degree of a technology is high, the desulfurization and the denitration are integrated, the double-tower structure are stable in properties, the desulfurization efficiency and the denitration efficiency are high, the source of an adsorption tower machine is reliable, the added value of by-products is high, little secondary pollution exists, and the operation cost is low.

The invention provides a compound bacterium agent for treating green wastes of gardens as well as a preparation method and application of the compound bacterium agent. The compound bacterium agent isprepared from phanerochaete chrysosporium, trichoderma viride, geotrichum candidum, candida utilis, saccharomyces cerevisiae, bacillus mucilaginosus, bacillus subtilis, lactobacillus plantarum, streptococcus thermophiles and azotobacter chroococcum. When the compound bacterium agent provided by the invention is used for treating the green wastes of the gardens, a carbon-nitrogen ratio and a carbon-phosphorus ratio are adjusted, without the need of adding any auxiliary material; a whole compost fermentation process can be finished through only independently adding the compound bacterium agent,so that the treatment cost of the green wastes of the gardens is effectively saved and a treatment technology is simplified. Microorganisms in the compound bacterium agent can be rapidly and greatly reproduced in a fermentation process, and rapid temperature raising and ageing of compost are promoted; the treatment time of the green wastes of the gardens is shortened and the compound bacterium agent is suitable for treating the green wastes of the gardens in practice.

The invention relates to a high precision absolute encoder. The encoder comprises a wheel of which the radius is changed with an angle, a gear, a group of position sensors, and an integrated circuit board used for processing output signals of the sensors, wherein the wheel of which the radius is changed with the angle and the gear are connected coaxially; the position sensors are positioned on the outer side of the circumference of the wheel of which the radius is changed with the angle, and are electrically connected with the integrated circuit board used for processing the output signals of the sensors; and the integrated circuit board used for processing the output signals of the sensors also can comprise a counter for calculating the rotating cycles of the encoder. Compared with the common photoelectric encoder, the high precision absolute encoder with the structure has the advantages of high accuracy, and wide tolerable working temperature range.

The invention discloses an epoxy resin waterproof material and a preparation method thereof. According to the invention, petroleum asphalt is used as a base material, then an epoxy resin, a filler and other auxiliary agents are added, and the above-mentioned materials are subjected to extrusion, calendering and molding so as to prepare the epoxy resin waterproof material. The epoxy resin waterproof material provided by the invention has a great number of excellent comprehensive economic and technical characteristic indicators such as excellent water resistance, seepage resistance, weatherability, high tensile strength, high elongation percentage, aging resistance, strong adaptability to deformation, a wide temperature adaptation range, strong and high bonding performance, a long service life, easy construction and low cost, and can be used in waterproof projects like passenger dedicated line bridge deck concrete, subways, roads, ports and wharfs and large-scale underground projects.

The invention discloses a polytetrafluoroethylene modified asphalt waterproof coiled material and a preparation method thereof. Petroleum asphalt is used as a base material, then polytetrafluoroethylene, a filler and an auxiliary agent are added, and the above-mentioned materials are subjected to extrusion, calendering and molding so as to prepare the polytetrafluoroethylene modified asphalt waterproof coiled material. The polytetrafluoroethylene modified asphalt waterproof coiled material provided by the invention has a great number of excellent comprehensive economic and technical characteristic indicators such as excellent weatherability, high tensile strength, high elongation percentage, aging resistance, strong adaptability to deformation, a wide temperature adaptation range, strong and high bonding performance, a long service life, no pollution, easy construction and low cost, and can be used in waterproof projects like passenger dedicated line bridge deck concrete, subways, roads, ports and wharfs and large-scale underground projects.

This invention discloses Pantoea sp. M3 (CCTCC No.M207022) with the ability to degrade malachite green. Logarithmic phase Pantoea sp. M3 2-4 wt. % is added into sterile degradation medium containing 0.5-5 mg / L malachite green, and cultured at 20-30 deg.C for 5-10 days to degrade malachite green. The degradation medium with a pH value of 6.0-8.0 comprises: glucose 0.5-1 g / L, NaCl 0.01-0.1 g / L, MgSO4 0.01-0.1 g / L, NH4NO3 0.02-0.1 g / L, K2HPO4 0.01-0.1 g / L, KH2PO4 0.01-0.1 g / L, and yeast extractum 0.06-0.3 g / L. Pantoea sp. M3 can effectively remove residual malachite green and leucomalachite green in water body for fishery. The degradation rate of Pantoea sp. M3 for 0.5-2 mg / L malachite green is higher than 90%.

The embodiment of the invention discloses a temperature control system and a temperature control method of a machine cabinet. The system comprises a machine cabinet and at least one heat dissipation pipeline which is communicated with the machine cabinet and vertically penetrates through the ground. A sealed internal circulation cavity is formed in the machine cabinet, and forms internal circulation through an air driving system of the equipment in the machine cabinet; the heat dissipation pipeline comprises a first pipeline positioned in the machine cabinet and a second pipeline buried underground; the first pipeline comprises an air outlet, is positioned at the upper part of the machine cabinet and is communicated with ambient air; the second pipeline comprises an air inlet communicated with the ambient air; the inner wall of the first pipeline is a heat exchange wall, and the heat exchange between an external circulation cavity formed by the first pipeline and the internal circulation cavity is realized through the heat exchange wall; and the heat dissipation pipeline is provided with at least one air conveying device for driving the air to flow in the heat dissipation pipeline. The embodiment of the invention is suitable for the temperature control of outdoor equipment, in particular for the heat dissipation of the outdoor equipment.

The invention provides a nuclear-radiation-resistant ageing-resistant rubber and relates to a rubber material which can be used in the environments of gamma, beta and X rays and various charged particle lines. The rubber is high in strength and stable in processing property, and can resist heat and radiation. The rubber comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer rubber, 5-25 parts of bismuth oxide serving as a radiation-resistant auxiliary agent, 30-60 parts of high-wear-resistance carbon black serving as a reinforcing agent, 2-4 parts of 4,4'-diisopropyl diphenylamine and 1-3 parts of p-benzoquinone dioxime serving as thermal oxidative ageing resistant auxiliary agents, 1-5 parts of dicumyl peroxide serving as a vulcanizer, 4-8 parts of paraffin oil serving as a plasticizer and 1-6 parts of processing aid. The nuclear-radiation-resistant ageing-resistant rubber provided by the invention can meet production of membranes in a nuclear power station, a radioactive medical treatment department and the like; by using the rubber, the phenomena such as minute bubbles, air clog and the like can be reduced; and bismuth oxide in the rubber not only has the effect of radiation protection but also has an activation effect, so that a finished product can maintain extremely high fatigue-resisting strength for a long term in the radioactive environment and can be used for effectively preventing radioactive rays from penetrating. The rubber has the characteristics of high strength, yielding resistance, good hot tearing resistant property and large temperature application range.

The invention relates to a building modular mould, comprising a hollow box type end-plate enclosed by four sides. Anyone of the following support structural bodies can be chosen in the hollow box type end-plate: a braced girder type support structural body, a support structural body of a hollow connecting multilateral or a combination, a ring or semi-circle ring connecting support structural body and an ellipse ring or semi-ellipse ring connecting support structural body; or a vertical reinforcing plate of a vertical reinforcement is fixed on the lateral face of the hollow box type end-plate; or two-edge vertical reinforcing plate is fixed on the two side edges of the lateral face of the hollow box type end-plate, and a vertical clamping table is arranged on the two-edge vertical reinforcing plate. The invention has the advantages of good integrity, high strength, stable size, high surface hardness, resistance to abrasion, non-deformation, easy rinsing, displacing wood with plastic, heat and cold resistant, anti aging, high degree of finish, repeated turnover of more than 100 times, secondary processing and utilizing, and long practical service life of over fifteen times more than the rubber blanket.

The invention provides a method for treating organic waste water by catalyzing persulfate by means of microwave-ultraviolet coupling. The method comprises the following steps: adding the persulfate into the organic waste water, putting the organic waste water containing the persulfate into a container in a microwave generation device, wherein the container is internally provided with an ultraviolet light generation device, turning on the microwave generation device, using microwave to excite the ultraviolet light generation device, and degrading the organic waste water under the action of catalyzing and activating the persulfate by means of microwave and ultraviolet coupling. According to the method, the persulfate is catalyzed and activated by a microwave and ultraviolet coupling method so as to generate sulfate radicals, and an oxidization system based on the sulfate radicals is formed, so that organic pollutants in the waste water are effectively degraded; in the processes of catalysis and activation, metal ions are not dissolved out in the system, so that secondary pollution is avoided; furthermore, the method is higher in degradation efficiency of organic matters in the waste water under the acidic, neutral and alkaline conditions, so that the waste water can be stably treated under the conditions of multiple pH values.

The invention discloses a four-point vibration damping system for a fiber optic rate gyroscope of a launch vehicle. A T-type vibration damper has equal rigidity along three directions, can greatly inhibit the coupling of line angles, can improve the accuracy of the fiber optic rate gyroscope under the mechanical environment, has a wide silicon rubber temperature adaptability range, covers the workambient temperature of the fiber optic rate gyroscope, and has the inherent frequency of 160Hz to 200Hz. The inherent frequency of the internal components of the product is 1000Hz or more. The vibration damper effectively attenuates the high frequency vibration, effectively prevents the resonant frequency of the components and improves the mechanical environment adaptability of the product.

The invention provides a water-based colored sand self-leveling polyurethane mortar, which can be used as an industrial floor and has excellent properties, such as heavy impact resistance, mechanical heavy load resistance, chemical resistance, etc., and can be used in high temperature and humid environments. The polyurethane mortar of the invention uses colored quartz sand to match the color paste, and the overall coating has sufficient compatibility, which can realize the long-term artistic decoration of the floor. The polyurethane mortar of the present invention adopts modified vegetable oil polyether polyol water dispersion, and diisocyanate, such as diphenylmethane diisocyanate (MDI), and high-performance concrete is cured at the same time, and the colored quartz sand in the system can strengthen The hardness of the coating, the obtained coating is durable and wear-resistant, and has various decorative effects. The polyurethane mortar system of the present invention can also be used for repairing and renovating building entities, or realizing decoration purposes on various substrates, etc.

The invention relates to a wide-temperature-range high-precision sputtering film pressure sensor and a manufacturing method thereof. A sensitive element in the sensor comprises a transition layer, aninsulating layer and a circuit layer which are arranged at the end part of a pressure interface; the circuit layer is provided with a pressure measuring circuit and a temperature compensation circuit;an adapter base is fixedly arranged on the sensitive element; a plurality of electric connecting pieces are circumferentially and uniformly arranged on the adapter base; each electric connecting piece comprises an arc-shaped bonding pad and an inserting pin which are connected with each other; the arc-shaped bonding pads are horizontally arranged on the adapter base; the inserting pins are perpendicular to the adapter base, and the bottoms of the inserting pins are fixed through bumps; a leading-out signal of the sensitive element penetrates through the adapter base to be connected with the arc-shaped bonding pad; a protective plate is arranged above the bumps to cover the adapter base; the inserting pin penetrates through the protective plate to be welded with one end of a lead wire; andthe outer side of a whole after welding of the inserting pin and the lead wire is further subjected to contour welding reinforcement through a metal wire. The pressure sensor solves the technical problems that an existing pressure sensor is relatively narrow in using temperature range, inaccurate in pressure measurement and not suitable for application under severe conditions of strong vibration,large impact and the like.

The invention discloses emulsified asphalt special for spraying rubber asphalt paint and a preparation method of the emulsified asphalt. The emulsified asphalt is composed of, by mass, 80-120 parts of asphalt, 40-80 parts of water, 2-5 parts of an anionic asphalt emulsifier, 0-3 parts of a pH agent and 0.1-1 part of a stabilizer, wherein the adding amount of the pH agent is not zero, and the anionic asphalt emulsifier is prepared by mixing at least two of a sulfonate surfactant, a carboxylate surfactant and a sulfate surfactant. The emulsified asphalt can be used for preparing the spraying rubber asphalt paint, can be mixed with a rubber emulsion at any proportion, is stable in storage below minus 10 DEG C and can be matched with the rubber emulsion for spraying construction at minus 5 DEG C. The spraying rubber asphalt waterproof paint prepared by using the emulsified asphalt is high in fluidity, long in working time, wide in temperature adaptation range, less prone to segregation and laying and excellent in physical and mechanical performance; during construction spraying, a coating is quick to solidify and better in performance index, and construction needs can be met fully.

The invention relates to a modified natural polymer combined flocculating agent and a using method thereof. The flocculating agent is the combination of modified natural polymer and complexing agent, wherein the modified natural polymer is prepared by carrying out phosphorylation modification, sulfonation modification or etherification modification on one or combination of two in shells of shelled animals such as shrimps, crabs and insects, cotton, straw, bagasse and starch; the complexing agent is combination of at least two in magnesium chloride, calcium chloride, sodium hydroxide, potassium hydroxide, aluminium chloride, aluminum sulfate, aluminium potassium sulfate, calcium oxide, sodium tetraborate, ferric chloride, ferrous sulfate, ferrous chloride, ferric sulfate, boric acid, hydrochloric acid and sulfuric acid. After the modified natural polymer is added, the complexing agent can be added into the natural polymer at any time within 12h according to the need of flocculation, and the flocculation reaction can be immediately finished. The invention has the advantages of controllable flocculation, rapid flocculation speed, large and firm flocculating body, low water content, safety, non-toxicity and wide temperature adaptation range.

A preparation method for dispersed oil well cement fluid loss additives comprises (1), preparing initiator solution with 0.21-0.25 part by weight of ammonium persulfate and 1.03-1.25 parts by weight of deionized water; (2), putting 61.57-75.25 parts by weight of deionized water into a reaction kettle and putting 0.51-0.63 part by weight of super-fine calcium carbonate into the kettle in a stirring state; (3), putting 4.82-5.90 parts by weight of sodium carbonate into the kettle and enabling the sodium carbonate to dissolve; (4), sequentially putting 17.44-21.32 parts by weight of 2-acrylamide-2-methylpro panesulfonic acid, 1.54-1.88 parts by weight of acrylamide, 1.54-1.88 parts by weight of N, N-dimethyl-acrylamid, 0.41-0.51 part by weight of fumaric acid, 0.21-0.25 part by weight of N-Vinyl-2-pyrrolidone, 0.61-0.75 part by weight of acrylic acid, 0.08-0.10 part by weight of isopropanol and 0.02-0.03 part by weight of sodium benzoate into the kettle; (5), enabling the temperature of the material liquid to rise to 58-60 DEG C and utilizing sodium carbonate to adjust PH value to 4.0-5.0; (6), adding the initiator solution into the kettle, rapidly stirring the initiator solution and the material liquid for 2 minutes and waiting for polymerization, and stirring the initiator solution and the material liquid when the temperature is observed to rise to 77-80 DEG C; (7), continuing reaction at a temperature of 81+ / -2 DEG C; (8), simply discharging the material liquid for microwave drying and crushing. The products prepared by the preparation method for the dispersed oil well cement fluid loss additives are wide in temperature adaptation range and good in salt-resistant performance.

The invention relates to a glaze formula and a preparation process thereof. According to the invention, feldspar, quartz, calcined talc, alumina, calcium carbonate, zirconium silicate, porcelain powder and kaolin of Longyan are ground and mixed, a glaze layer fired by the glaze formula has characteristics of bright glaze layer, uniform glaze thickness, wear resistance, and impact resistance, and can prevent the glaze from being damaged during the collision, and the firing qualification rate is more than 97%.

The invention discloses bacillus subtilis yielding mesothermal alpha-amylase. The strain is obtained by compound mutation by virtue of lithium chloride-diethyl sulfate. The bacillus subtilis 304 is specifically Bacillus subtilis 304, wherein the preservation number is CCTCC NO: M 2013600. The optimum action temperature of the mesothermal alpha-amylase yielded by bacillus subtilis is 65 DEG C and the mesothermal alpha-amylase which is preserved at 65 DEG C for 24 hours still has 80% enzyme activity and which is preserved at 70 DEG C for 12 hours still has 50% enzyme activity; the optimum reaction pH value of the enzyme is 5.0 and the mesothermal alpha-amylase which is preserved at pH of 4-6 for 18 hours still has over 80% enzyme activity; the enzyme activity is 7000-8500U / ml. The bacillus subtilis is particularly suitable for industrial demand, wherein the reaction temperature is high and a liquefaction process and a saccharification process exist.

The invention relates to a photo-induced reversible self-repair polyurethane film and a preparation method and a repair method thereof. The polyurethane film mainly comprises 10 to 40 parts of phenolic hydroxyl coumarin derivative, 10 to 50 parts of alkyl bromal compound, 10 to 40 parts of polyisocyanate, and 10 to 30 parts of polyether polyol or polyester polyol. The preparation method comprises the following steps of: generating phenolic hydroxyl coumarin by using the phenolic hydroxyl coumarin derivative and the alkyl bromal compound under the action of absolute potassium carbonate; and reacting the phenolic hydroxyl coumarin, the polyisocyanate and the polyether polyol or the polyester polyol to obtain polyurethane solution, and performing cross linking under the irradiation of ultraviolet with wavelength of 350 nanometers after the film is formed to obtain the polyurethane film. The damaged surface is irradiated through the ultraviolet with wavelength of 254 to 350 nanometers, so that the reduced coumarin monomers are subjected to dimer cross linking reaction again and the purpose of repairing cracks is fulfilled. Compared with the prior art, the polyurethane film has the characteristics of good film forming property and high transparency; and the repair process is simple and has low cost.

The invention relates to a sound attenuation and noise reduction device applied to an air duct. The sound attenuation and noise reduction device includes a flexible joint and a muffler. Flange piecesare arranged at both ends of the flexible joint and the muffler. A pipe at the original air duct is cut and removed, and the flange pieces are installed at pipe orifices by welding. The flange piece at one end of the flexible joint is connected with the flange piece on the end part of the pipe on one side, and the flange piece at the other end of the flexible joint is connected with the flange piece at one end of the muffler. The flange piece at the other end of the muffler is connected with the flange piece on the end part of the pipe on the other side. The sound attenuation and noise reduction device can realize arbitrary combination, disassembly and installation. Meanwhile, the sound attenuation and noise reduction device can be quickly connected and installed with the pipes at any desired position in an original pipeline. Through the installation of the sound attenuation and noise reduction device in the middle of the existing pipe, the impact of vibration generated during the operation of the air duct on existing surrounding structures can be efficiently and safely reduced, the decibel value of noise generated during the operation is reduced, and it is ensured that the factoryboundary noise meets the standard.