102results about How to "Wide range of conditions" patented technology

The invention discloses a nitration method of iron-carbon nitrosation, a reactor therefor and a method of sewage water denitrogenation. Iron filings and active carbon are added in the reactor hierarchically or mixed, water containing ammonia nitrogen is supplied in the reactor and oxygen enriched air is blew in thereof, only inorganic iron-carbon in condition of aeration, ammonia nitrogen is conversed into nitrite and nitrate steadily. The reactor is composed of a supporting layer, a back purge system, a water-inlet- distribution device, a air diffuser, iron / carbon composite material, a drift eliminator and bed body, nitrosation or nitration is finished in action of ammonia sewage water. The reactor is combined with a denitrify reactor, a anaerobic bioreactor, or used as a aeration biological filter of biology filler to finish denitrification process of nitrogen sewage water. The reactor has advantages of stable performance, high efficiency, low power cost and simple maintenance. An integrated denitrification technics is formed in the reactor, denitrification efficiency of the whole flow is improved.

The invention discloses a control method and system device for automatic idle-speed starting and stopping of an engine. The control method comprises the steps of: detecting and showing the voltage of an energy storage system, the vehicle speed, the rotation speed of the engine, the vehicle sliding state, pressure of a gas braking system and other signals, and selectively starting and stopping the engine based on the signals. Compared with the prior art, the control method and system device disclosed by the invention have the advantages that the condition range of the idle-speed starting and stopping of the hybrid power carriages is enlarged, the fuel is greatly saved, and the engine is intelligently and automatically controlled.

The invention discloses a novel phosphorus and magnesium based cement grouting material and a preparation method and belongs to the field of technical application of grouting materials. The grouting material is prepared from the following raw materials in parts by weight: a component A: 30 to 90 parts of a compound magnesium compound, 0.5 to 5 parts of a compound retarder, 0.2 to 0.7 part of a water reducer, 0.2 to 1.5 parts of an acid-alkali buffering agent, 1 to 5 parts of a compound stabilizer and 0.5 to 1.5 parts of a compound surfactant; a component B: 20 to 50 parts of phosphate and 0.2to 2 parts of a de-foaming agent. The preparation method comprises the following steps: accurately weighing materials of the component A and the component B according to the ratio and uniformly stirring; mixing with water according to the weight ratio of 100 to (20 to 50) and stirring to form slurry; after uniformly mixing, pressing a mixture into gaps or cracks and curing. The novel phosphorus and magnesium based cement grouting material disclosed by the invention has the beneficial effects of controllable coagulation time, large adjustable range, high early age strength, high bonding strength, good permeability, simplicity and convenience for construction, greenness and environment protection and low cost, and meets the requirements on three properties including injectability, controllability and permeability resistance.

An oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas relates to a mineral exploitation method. The high-temperature overheating water steam convection heating is used by the prior art to exploit oil and gas of an oil shale. As the temperature capacitance coefficient of the high temperature overheating water steam is low, heating of a mineral layer is slow, which increases the cost and reduces the efficiency. Some oil shale deposits are in the desert, and much water is needed by the overheating water steam heating, so the deposits cannot be exploited. The invention uses the hydrocarbon gas as the convection heating fluid. The high temperature hydrocarbon gas is injected into the oil shale along a heat injection well, and the heated mineral layer causes pyrogenation of the kerogen to form oil and gas, which is carried by the low-temperature gas or water along a production well to the ground. After the oil and gas is separated from the water, gas will be separated independently to from the oil and gas product, and the hydrocarbon gas will enter a storage tank to be pressurized and heated to the designed pressure and temperature. Then the hydrocarbon gas will be injected into the oil shale mineral layer for circulating exploitation of oil and gas. Thus, the oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas is economical and more convenient for application in the industry.

The invention discloses a mixed neutral cellulase, and belongs to the field of enzymatic preparations. The mixed neutral cellulase comprises, in parts by weight, 10-40 parts of cellulase, 20-30 parts of acidic xylanase, 5-10 parts of pectase, 3-8 parts of mannanase and 2-8 parts of a Chinese herbal medicine powder. According to the prepared mixed neutral cellulase, the active components of the Chinese herbal medicine powder is effectively utilized, a special method is utilized to overcome the disadvantage that conventional acidic xylanase is fermented by employing a single bacterial strain; compared with unprocessed pulp, beat pulp processed by the mixed neutral cellulase is improved in beating degree by 11.76%, improved in short fiber burst index by 11.98% and improved in ring crush index by 13.99%; the beat pulp processed by the mixed neutral cellulase is improved in long fiber pulling force index by 40.17% and improved in tear index by 58.91%; the beat pulp processed by the mixed neutral cellulase has relatively smooth fiber surface and relatively soft enzyme fiber; paper made from the beat pulp processed by the mixed neutral cellulase is improved in tear index by 8.3%, improved in tensile index by 10.6% and improved in burst index by 16.5%; and paper pulp whiteness is improved by 2%-5%, sewage quality is substantially improved, and environmental pollution degree is reduced.

The invention discloses a cobalt oxide / carbon composite nano wave-absorbing material and a preparation method thereof and relates to a magnet / dielectric composite nano wave-absorbing material. The cobalt oxide / carbon composite nano wave-absorbing material has a core-shell structure, wherein the core is magnetic cobalt oxide; and the shell is a carbon layer. The preparation method comprises: adding a cobalt salt into a solvent, and after the cobalt salt is dissolved, filling the solution into a reaction kettle; placing the reaction kettle in an outer cover and heating the reaction kettle; after the reaction kettle cools naturally to room temperature, taking out supernatant liquor, carrying out centrifugal separation on lower precipitate, washing and drying the precipitate to obtain a flaky / flower-shaped cobalt hydroxide precursor; mixing the precursor and oleylamine in a quartz tube; after the precursor is dissolved, inserting the quartz tube in a tubular furnace to heat the quartz tube at a constant temperature for at least 20 minutes; and taking out the quartz tube, adding absolute ethanol, standing the mixture, carrying out centrifugal separation on the mixture, and washing and drying the precipitate to obtain the cobalt oxide / carbon magnet / dielectric composite nano wave-absorbing material.

The invention relates to a copper- contained niobium potassium composite oxide photocatalyst and the method for preparation, the photocatalyst being the potassium niobium and copper composite oxide, the general formula being KxCuyNbzOw, among it, x= 1.8- 2, y=0.005- 0.2, z= 3.6- 4.2, and w= 11.51- 10.035. Comparing with the normal technique, the product and the preparation method have a merit as the following: 1. having a perfect photocatalysis activity without noble metal; 2. the condition in the process being flexible; 3. the technique simple, and the cost low.

The invention discloses a control system of methanol / natural gas flexible fuel engine and a control method of the control system of the methanol / natural gas flexible fuel engine. The control system comprises a methanol oil supply injection system, a natural gas supply injection system and a methanol / natural gas flexible fuel electric control system, wherein the electric control system comprises asensor, an actuator and an ECU, the control system controls the methanol amount through a methanol fuel injector, a fuel gas nozzle controls the fuel gas amount, an electronic throttle valve body controls the air inlet air amount, a wide-area oxygen sensor controls the air-fuel ratio of engine operation through detection and closed-loop feedback; the control method can enable the engine to operatein a pure methanol working mode, a pure natural gas working mode and a methanol / fuel gas dual-fuel working mode and controls to accurately control the methanol injection amount and the natural gas injection amount according to different working states of the engine, the injection time and the injection duration, the air inlet air volume and the air-fuel ratio of the gas fuel can be controlled, sothat the safe and stable operation of the engine is ensured, the fuel consumption is reduced, and the emission of the tail gas is reduced.

The invention relates to a terpolymer oil soluble viscosity reducer for thick oil exploration and transportation and a preparation method thereof. The terpolymer oil soluble viscosity reducer for thick oil exploration and transportation is characterized in that the viscosity reducer is prepared from methacrylate ester, N, N'- 2 (methacryloyloxyethyl) diamine, styrene, azobisisbutyronitrile and toluene, and the molar ratio of all the raw materials is as follows: methacrylate ester: N, N'- 2 (methacryloyloxyethyl) diamine: styrene is (4 to 5): (2 to 3): (2 to 4), the added amount of the azobisisbutyronitrile is 0.5 to 2 percent of the total mass of the methacrylate ester, the N, N'- 2 (methacryloyloxyethyl) diamine and the styrene, and toluene serves as the solvent; the methacrylate ester is prepared from acrylic acid, C16 to C22 higher alcohols, sulfoacid catalyst and phenolic inhibitor; and the N, N'- 2 (methacryloyloxyethyl) diamine is prepared from methyl acrylate and diamine. The oil soluble viscosity reducer has the advantages of good effect, strong universality, no pollution and relaxed use conditions, and can simultaneously meet the needs of thick oil exploration and transportation.

The invention discloses a copper seed etching solution used for wafer level package. The etching solution comprises the following components, 40-60g / L of hydrogen peroxide, 5-35g / L of inorganic acid,5-35g / L of organic acid, 1-30g / L of copper ions, 1-2g / L of chloride ions and 1-2g / L of surface active agents according to the concentration proportion. The components are mixed in proportion, the mixing reaction temperature is between 30 DEG C and 50 DEG C, the reaction time is 1s-400s, and the copper seed etching solution is formed after mixing. Chelating agents formed by mixing the hydrogen peroxide and the inorganic acid and the copper ions can be subjected to chelation to form water-soluble complexes, so that equilibrium is reached; and the chloride ions play a role in maintaining the PH value of a system in the solution, maintains charge balance of the system in the etching process and prolongs the service life of the etching solution. The copper seed etching solution has the characteristics of being stable in performance, suitable for superfine circuits, small in lateral erosion and hardly corrosive to copper and aluminum.

The invention relates to a polyacrylamide polymer viscosity reducer. The polyacrylamide polymer viscosity reducer comprises the following components by mass part: 2.2-30% of a mineralization degree conditioning agent, 0.1-0.5% of a viscosity conditioning agent, 0.1-0.5% of a surfactant, 0.5-2% of a corrosion inhibitor, 0.1-1% of a cleaning compound and the balance of water; wherein a sum of the mass percentages of the components is 100%. The provided viscosity reducer can rapidly reduce viscosity of the polyacrylamide polymer and reduces the viscosity of polyacrylamide polymer fracturing fluid, the viscosity of the liquid after viscosity reduction tends to the viscosity of water, and flowback of the liquid is easily carried out.

The invention discloses a bleaching compound enzyme for papermaking and a preparation method of the bleaching compound enzyme. The bleaching compound enzyme for papermaking, which has the advantages of complete enzyme system, good bleaching effect, easiness in preservation and good storage stability, is prepared by taking high temperature-resistant alkaline xylanase as main raw material, scientifically compounding a thermophilic bacillus culture, laccase and a medium thereof, dextranase, EDTA (ethylenediaminetetraacetic acid), a protecting agent, an activator, mannose, lipase, tannase, pectase, a whiteness stabilizer, a nonionic surfactant, an antioxidant and the like, completely retaining paper pulp cellulose and simultaneously dissolving out and degrading lignin to the greatest extent. The bleaching compound enzyme disclosed by the invention can significantly improve yield and quality of paper pulp against broad-leaf wood, coniferous wood and reed yellow slurry, and the whiteness is improved by 10.94%, 11.97% and 11.10% respectively; the yellow index is reduced by 39.84%, 37.31% and 24.32% respectively; the amount of conventional chemical products can be saved by 50-60%; and the purposes of reducing cost and protecting an environment are finally achieved.

The invention provides an electric car charging load forecasting method based on the Monte Carlo simulation method. The electric car charging load forecasting method based on the Monte Carlo simulation method includes the following steps that the simulation frequency is set, the car charging action is confirmed, charging load curves are accumulated to obtain an overall charging load. Whether the current simulation frequency is larger than the set simulation frequency or not is judged. Whether the overall charging load serving as a simulation result converges or not is judged. If yes, the simulation result is output. If not, returning is performed and the simulation frequency is reset. The invention further provides a corresponding system. The electric car charging load forecasting system and method based on the Monte Carlo simulation method can dynamically forecast the charging load of the electric car and meanwhile, the forecasting precision is controllable. The forecasting result can serve as the great accordance for a power grid enterprise to carry out the study on coping with influences brought by the large-scale development of electric cars on the power grid and provide reference for power grid construction and planning of the power grid enterprise, planning and construction of a charging and electrical changing station, interaction technological study between the power grid and the electric car and the like.

The invention relates to a rapid circulation air cooling vacuum furnace which comprises a rapid circulation air cooling vacuum furnace body and a rapid circulation air cooling system thereof. The rapid circulation air cooling vacuum furnace is applied to the field of materials and machinery. A roots pump, a variable-frequency motor and a water cooling system are serially connected with the vacuum furnace body to form a circulation air path, rarefied gas can continuously and uniformly circulate in the vacuum furnace body with any size and in any shape by the aid of high compression ratio of the roots pump under low pressure, and materials in the vacuum furnace body can be rapidly cooled through water cooling devices on two sides. The use range and the use efficiency of the rapid circulation air cooling vacuum furnace are greatly increased, control ranges and accuracy of the temperature and the pressure of the vacuum furnace are improved, and temperature uniformity of a plurality of workpieces is improved.

This invention discloses a method for preparing stable carbon nanotube (CNT) suspension by using tannic acid. The method comprises: (1) affing distilled water into tannic acid to obtain 5-500 mg / L tannic acid aqueous solution; (2) adding CNT (inner diameters less than or equal to 100 nm) to obtain 10-1000 mg / L CNT solution; (3) ultrasonicating in an ultrasonic cleaner for 30-60 min; (4) standing for more than 24 h, transferring the CNT suspension into another container. The dispersant in this invention, tannic acid, is a nontoxic and water-soluble natural product, and has high suspension ability to CNT. The obtained CNT suspension is stable, and the method is suitable for a wide range of conditions.

The invention discloses a carbon monoxide high pressure sulfur-tolerant shift catalyst, comprising a catalyst active component, an alkali metal activated assistant and a carrier, which is characterized in that the alkali metal activated assistant is an alkali metal mineralizer. The alkali metal mineralizer is an albite, a potash feldspar, a sodium nepheline or / and a kalsilite, wherein, the sodium nepheline or / and a kalsilite is preferable. An alkali metal oxide accounts for 0.1 to 15 percent of the total weight of the catalyst. The invention also provides the preparation method of the catalyst. The operation technology is simple and the catalyst can be prepared by kneading, extruding and calcining. The prepared catalyst has low light-off temperature. Under the conditions of high pressure, high temperature and high water-gas ratio, the alkali metal has little drain rate or even no drain and has high strength and strength stability.

The invention discloses a composite microbial agent, a preparation method thereof and a salty sewage treatment method. The composite microbial agent comprises halophilic archaea, halophilic bacteria and halotolerant bacteria. The preparation method comprises the following steps of performing liquid culturing on each component under different salinities respectively, and mixing bacterium solutions to obtain the composite microbial agent when each bacterium solution contains a certain amount of bacteria. The composite microbial agent can be added into salty sewage to treat the salty sewage. Different strains in the composite microbial agent are in different growth states under different salty conditions, and advantages in the growth of the strains within high, medium and low major salty ranges are achieved, so that the microbial agent can be used for treating organic sewage with different salinities, and is wide in application range.

The invention discloses a heavy metal adsorbent and a preparation method and application thereof. The heavy metal adsorbent is prepared by modifying raw materials including attapulgite clay and microcrystalline cellulose, wherein the mass ratio of attapulgite clay to microcrystalline cellulose is (1-4) : 1, and attapulgite refers to aqueous magnesium-rich aluminosilicate mineral having the laminated chain structure. The heavy metal adsorbent is applied to preparation of adsorbent products for overcoming heavy metal pollution. Since attapulgite and microcrystalline cellulose are taken as the raw materials, cellulose is dissolved by an alkali / urea system, and attapulgite and calcium carbonate are added to prepare a porous attapulgite and cellulose composite adsorbent; the the modifying process needs mild condition without pollution, is easy to control and has high yield. Besides, the attapulgite and cellulose composite adsorbent is low in cost, environmental friendly, high in adsorptioncapacity, wide in service condition, and can be applied industrialized production.

The invention relates to a preparation technology of electrolyte doped with mixed colloidal silica for a lead-acid battery. The preparation technology belongs to the technical field of lead-acid batteries and is characterized by comprising the following steps of: diluting sodium silicate by virtue of deionized water, adjusting the pH value to equal to 6 by virtue of acid after removing Na+, performing the procedures of heating, ageing and concentrating to obtain colloidal silica, and then mixing dilute sulphuric acid, water solution of the colloidal silica, water solution of siloxane, water solution of glycol, water solution of phosphoric acid and water solution of stannous mono-sulphate to obtain sodium silicate colloid; mixing the dilute sulphuric acid, fume silica emulsion and water solution of oxalic acid to prepare fumed silica colloid; and mixing the sodium silicate colloid and the fumed silica colloid to obtain the electrolyte doped with the mixed colloidal silica. The prepared colloids are semitransparent liquid; after shear thinning, the colloid diluting time is long, and the colloids are not layered and hydrated; and the mixed colloids are uniform, fine and smooth, good in mobility, and easy to be injected.

The invention belongs to the technical field of turbine vibration fault diagnosis, and relates to turbine vibration fault diagnosis adopting deep learning, namely a turbine vibration fault diagnosis method based on a deep learning artificial neural network. The invention discloses a turbine vibration fault diagnosis method based on a deep learning artificial neural network. Parameter characteristics and connection among parameters when the turboset system vibrates are comprehensively considered. Data are preprocessed through multivariate analysis, so that an independence relation among variousdata is established, redundant data are reduced, a basic feature table is constructed, then deep learning artificial neural network training is carried out, and the trained deep learning artificial neural network is obtained to diagnose the vibration fault of the steam turbine. The method is based on the deep learning artificial neural network, and is characterized in that the deep learning artificial neural network is used, so that the construction of a calculation model is avoided, and meanwhile, the dimension reduction is carried out by using multivariate analysis during data preprocessing.

The invention provides a gel matrix and a preparation method thereof, and the gel matrix is used for preparation of gel dosage form drugs. The gel matrix provided by the invention includes: 0.5-10% of gel, 0.1%-10% of a tissue stabilizer, 0.1%-10% of a tissue repair agent, 0.5%-5% of a transdermal enhancer, 1%-10% of a non-water solvent with concentration higher than 90% and water, or a non-water solvent with concentration not more than 50%. The gel matrix provided by the invention has certain leveling property (uniformity), flexibility and moisture retention, so as to reduce the ''parching'' phenomenon. The gel matrix provided by the invention has strong ability of bearing and releasing drugs to satisfy quantitative addition of medicinal ingredient and guarantee stability and uniformity of drug storage and drug concentration in a course of treatment. The gel matrix provided by the invention can improve release rate, percutaneous absorption rate and safe treatment of the drug. The invention can increase tissue compatibility of the preparation, properly prolong action time and application frequency, so as to increase effectiveness and reduce the occurrence of local side effects.

The invention discloses a paper pulp bleaching compound enzyme and a preparation method thereof. Through scientific compounding of high temperature-resistant alkaline xylanase as a main raw material and bacillus thermophilus culture, laccase and its medium, glucanase, EDTA, a protective agent, an activator, seminase, lipase, tannase, pectase, a whiteness stabilizing agent, a nonionic surfactant and an anti-oxidant, the paper pulp bleaching compound enzyme is prepared. The paper pulp bleaching compound enzyme completely retains paper pulp cellulose, maximally dissolves and degrades lignin, has the advantages of complete enzyme system, good bleaching effects, storage easiness and good storage stability, can substantially improve a yield and quality of paper pulp of broad leaf wood, needlebush and reed yellow waste slurry, respectively improves whiteness by 8.18%, 8.13% and 8.23%, respectively reduces a yellow index by 38.35%, 35.82% and 31.76%, saves a conventional chemical article use mount by 50-60%, reduces a cost and protects the environment.

The invention provides a flexible light wide-temperature leaky coaxial cable which is characterized by comprising a cable internal conductor (1), an insulating layer (2), an external conductor (3) and a sheath layer (4) which are arranged from inside to outside in turn. The cable internal conductor (1) and the external conductor (3) are formed by carbon nanotube fiber material. The external conductor (3) is provided with groove holes which are uniform in size. According to the flexible light wide-temperature leaky coaxial cable, an innovative ideal is provided for expansion of use and development of the leaky coaxial cable under the extreme conditions so that the flexible light wide-temperature leaky coaxial cable has great social benefit.

The invention discloses a temperature control micro valve based on liquid crystal and single-stage and multi-stage control systems thereof, which are applied to the technical field of micro-fluidic chip micro valves; the temperature control micro valve comprises a micro-channel, a substrate, the liquid crystal and a temperature control element; wherein the micro-channel is arranged above the substrate; the liquid crystal is arranged in the micro-channel and can flow along the direction of the channel; the temperature control element is arranged on the micro-channel wall on any side vertical tothe liquid crystal flow direction; according to the invention, the runoff regulation of the sample is realized through the asymmetric flow characteristic of the liquid crystal under the non-uniform temperature field, so that the sample injection amount of different reactors or detectors is controlled, the comparison effect of chemical reaction or biological detection is remarkably enhanced, and the workload and related cost of experiments and detection are greatly reduced at the same time.

The present invention relates to a method for treating sewage by using coupling field oxidation, and its technological process includes the following steps: firstly, making the sewage undergo the processes of magnetization treatment, primary coagualting reaction and precipitation to remove suspended matter, then feeding said sewage into first coupling field oxidation pool to make oxidation, and making the oxidated water undergo the processes of coagulation reaction, precipitation and secondary coupling oxidation so as to implement said invention. Its coupling oxidation is implemented by using mixed oxidant containing O-, O2, O and O3 in coupling field formed from at least two both of magnetic field, ultrasonic wave and UV light. Said method is good in treatment effect, can effectively remove COD, BOD, SS, N, P, chromaticity and abnormal smell, etc. in the water.

The invention relates to a preparation method and application of a phosphoric acid treated Trogers Base polymer gas separation membrane, belongs to the technical field of membrane method gas separation, and solves the technical problems of low separation selectivity and low separation efficiency of an existing separation membrane on light gases such as hydrogen and carbon dioxide. The solution isas follows: firstly, a rigid skeleton structure of a Trogers base is utilized to obtain a large free volume and improve the gas transmission efficiency, and after treatment by phosphoric acid, the stability of phosphoric acid in a polymer is maintained by utilizing the action between N on a main chain and phosphoric acid, and the selectivity of hydrogen to carbon dioxide is improved. Adjustment ofthe selectivity is achieved by changing the acid treatment conditions of the polymer. Experiments show that the performance of the treated membrane exceeds the current Robeson upper limit in 2008 atnormal temperature and high temperature.

The invention provides a tunnel driving shield support. The support comprises a shield plate beam. The shield plate beam is provided with a bidirectional top extension mechanism which can simultaneously stretch out from the upper portion and the lower portion of the shield plate beam. The bidirectional top extension mechanism is supported on a tunnel base plate and a tunnel top plate, and then theshield plate beam is supported below the tunnel top plate. By using the tunnel driving shield support, the bidirectional top extension mechanism is supported on the upper surface of the tunnel base plate and the lower surface of the tunnel top plate; the above support mode is stable, the shield plate beam is prevented from moving and toppling; and in a certain range, the height of the shield beamplate can be adjusted. In a traditional technology, the shield beam plate is in contact with the uneven tunnel top plate so that the shield beam plate is distorted and deformed. In the invention, theabove condition is avoided, and the safety of workers carrying out anchor bolt support operation under the tunnel driving shield support is protected. The invention also discloses the supporting method of the tunnel driving shield support.

The invention relates to a method of reinforcing a railway on a small radius curve and an easement curve. The method comprises the following steps: by using a special wooden sleeper, locking the wooden sleeper above a D-type temporary beam with a U-shaped bolt; leaning the inner wall of the longitudinal beam of the D-type temporary beam against the special wood with a short wood to prevent transverse slip due to the loosening of the U-shaped bolt, so as to ensure double tracks of the line stable; meanwhile, adjusting concrete pillows of the original line to fall between D-type temporary beam steel pillows so as to ensure the transverse crosswise demand of the double tracks of the line; and additionally burying top and twin-side steel rails at the ends of the D beam to fix the D-type temporary beam to resist line slip generated by transverse torque in the section in travelling. By adopting the combined structure for reinforcing the small radius curve and lines in the easement curve, the elements of the line can be maintained unchanged and the travelling safety can be ensured. The using condition of the D-type temporary beam is widened, the cost is lowered, the construction efficiency is improved, and the structural technical risk and the construction risk are reduced. The method provides reference to future engineering construction, accumulates experience and is obvious in economical and social benefits.

The invention discloses a bleached compound enzyme and a preparation method thereof. The preparation method comprises the following steps: by taking high-temperature-resistant alkaline xylanase as a main raw material, scientifically compounding a bacillus thermophilus culture, laccase and media thereof, dextranase, EDTA, a protective agent, an activating agent, mannose, lipase, tannase, pectinase, a whiteness stabilizer, a nonionic surfactant and an antioxidant, dissolving the lignin to the greatest degree when the pulp cellulose is completely remained, degrading the lignin, thereby obtaining the bleached compound enzyme with the advantages of complete enzyme system, good bleaching effect, simplicity in preservation and good storage stability. According to the broadleaf wood, needlebush and reed yellow pulp, the pulp yield and quality can be obviously improved, and the whiteness is respectively improved by 10.94 percent, 11.97 percent and 11.10 percent; the yellowing value is respectively reduced by 39.84 percent, 37.31 percent and 24.32 percent; the amount of conventional chemicals can be saved by 50-60 percent; and finally, the aims of reducing the cost and protecting the environment are achieved.

The invention discloses a building height automatic measuring device, which comprises a bearing frame, an angle measuring device, a display device, a laser transmitter and a microprocessor. The bearing frame comprises three legs and a support; the support is provided a cavity; two DC motors, a power supply, a horizontal automatic adjusting device and a lifting device are arranged in the cavity; alifting rod is vertically disposed on the support; a rotating table is rotarily arranged on the lifting rod; the upper end of the rotating table is provided with the laser transmitter; the laser transmitter can rotate for 180 DEG around a hinge shaft; the angle measuring device obtains an angle value to be inputted to the microprocessor; the microprocessor simultaneously receives parameters for acquiring a height; after a needed parameter is received, the microprocessor automatically runs, and the height of the building is obtained through processing and is displayed on the display device. Themicroprocessor with automatic data processing is equipped, and after corresponding needed initial data are acquired, the microprocessor can perform automatic processing to obtain the height of the building.