334results about How to "Enhance the destructive effect" patented technology

A method and material for self-cleaning of the teeth and mouth using a source of light in the visible range in conjunction with a photosensitive oral hygiene composition possessing a broad absorption spectrum in the visible range. The invention selectively eliminates harmful bacteria by use of a photosensitive agent and a light source. The present invention involves the use of a light-providing dental device to activate a photosensitive agent and destroy harmful bacteria in the oral cavity. It prevents or deters oral diseases, inflammations, and infections.

The invention provides a steel plate having low-temperature toughness, high tensile strength and low yield ratio, as well as a method for making the same. By combining simple combination design of alloying elements with optimized TMCP process, the method successfully solves the problem that low-temperature impact toughness and low yield ratio are in mutual conflict and difficult to reconcile in composition design and process design, which reduces the amount of steel material, saves cost, lightens the dead weight of a steel structure, increases stability and safety, and more importantly, improves the safety, stability and seismic damage resistance of the steel structure. The steel plate can be widely applied to large-scale high-rise building structures, bridge structures, offshore oil production platform structures, low temperature pressure vessels and large-scale ship structures.

The invention provides a silver-loaded low-molecular-weight chitosan composite microsphere antibacterial agent and a preparation method thereof. Low-molecular-weight chitosan is used as a raw material, and a low-molecular-weight chitosan acetic acid solution, a silver nitrate solution and a vanillic aldehyde ethanol solution are mixed to form composite sol; then paraffin is used as a continuous phase, sorbitan monooleate and alkylphenol ethoxylates are used as a compound emulsifier, a silver / low-molecular-weight chitosan sol is used as a monomer, and sodium tripolyphosphate is used as a cross-linking agent for preparing an emulsion system for emulsification crosslinking, and finally washing and drying are performed, so that the silver-loaded low-molecular-weight chitosan composite microsphere antibacterial agent is obtained. Due to the fact that the low-molecular-weight chitosan is used as the raw material, nanometer silver particles can enter microspheres, and the antibacterial activity of the composite antibacterial agent is obviously improved. The obtained antibacterial agent has the broad-spectrum bactericidal activity, and has the efficient fatality rate for both escherichia coli and staphylococcus aureus.

The invention discloses high-functionality degree polyester polyol and a preparation method thereof. The high-functionality degree polyester polyol comprises the following components in parts by mass: 900-1200 parts of polyester alcoholysis liquid, 900 parts of phthalic anhydride, 400-600 parts of aliphatic dibasic acid, 800-1000 parts of dihydric alcohol, 550-900 parts of polyhydric alcohols, 0.3-0.5 part of esterification catalyst. The preparation method comprises the following steps: carrying out an esterification reaction, removing the moisture, performing condensation polymerization, thereby obtaining the product. According to the high-functionality degree polyester polyol, the average functionality degree is 2.4-2.5, the viscosity is less than or equal to 10000mPa.S at the temperature of 25 DEG C, the hydroxyl value is 300-350mgKOH / g, the acid value is less than or equal to 1mgKOH / g, and the polyester polyol is non-crystallizable after being stored for three months under the condition of 2 DEG C. The polyester polyol disclosed by the invention can be widely applied to the fields of rigid polyurethane foam plates, polyurethane elastomers and polyurethane adhesives.

The invention discloses a pretreatment method of lignocellulose by using microwave-assisted alkaline sodium sulfite, belonging to the technical fields of biomass resource utilization and agricultural waste comprehensive utilization. The method comprises the following steps: by using lignocellulose as a raw material, pulverizing, screening, and pretreating by using microwave-assisted alkaline sodium sulfite to lower the alkali consumption and enhance the pretreatment effect of the alkaline sodium sulfite; and carrying out solid-liquid separation, flushing the solid residue with an alkaline sodium sulfite solution, and washing with water to obtain the lignocellulose pretreatment product with favorable enzymolysis effect. The method can better remove lignin and reduce the inhibition effect of lignin on cellulose degradation, thereby effectively enhancing the conversion efficiency from lignocellulose to monosaccharide. The method reduces the chemical reagent consumption, is beneficial to environmental protection, and lowers the production cost, thereby generating higher economic value.

The invention discloses a method for willow artwork dyeing through a natural indigo pigment. The method comprises the following aspects that (1) indigo extraction is conducted, specifically, a plant raw material is subjected to crushing, fermentation, water soluble extraction and low-temperature drying, and the indigo pigment is prepared; (2) acid-alkali steeping is conducted, specifically, a hydrochlric solution with the concentration being 0.3-0.4% and a sodium hydroxide solution with the concentration being 0.25-0.3% are used to steep a willow artwork correspondingly; (3) cooking for impurity removal is conducted, specifically, impurities in the willow artwork is removed through cooking; (4) steaming for dyeing is conducted, specifically, the indigo pigment with the mass being 11-13% that of distillation boiler water is added, and steam dyeing is conducted; (5) low-temperature drying is conducted, specifically, the dyed willow artwork is dried; (6) infrared color fixing is conducted, specifically, the willow artwork is wrapped through mixed slurry and placed under infrared lamplight with the illumination intensity being 470-520 lux for color fixing; (7) ultraviolet inspection is conducted, specifically, the willow artwork subjected to color fixing is placed under an ultraviolet lamp, and the color fixing condition is inspected; and (8) tung oil layer coating is conducted, specifically, the willow artwork qualified after inspection is coated with tung oil, and after drying, the willow artwork with the natural indigo pigment is prepared.

The invention discloses a weather-proof and quick-drying pavement damage repairing material which comprises the following raw materials in parts by mass: 100 parts of epoxy resin, 5-20 parts of a reactive diluent, 10-40 parts of a filler, 40-90 parts of a curing agent, 0.5-1.5 part of a hindered amine light stabilizer and aggregate, wherein the ratio of the mass of the aggregate to the total mass of components in a group A and the total mass of the components in a group B is 2 to 1-10 to 1. The invention further discloses a preparation method of the repairing material. The repairing material is solidified at a normal temperature, is good in weather resistance, quick in solidification, prominent in interface adhering performance, wide in application scope, simple and convenient to construct and operate, and long in service life.

The invention relates to an application of colloid photon crystal films, in particular relates to the application field of sunlight selective utilizations, and concretely relates to a process for preparing whole visible light condensers with surface photon crystal film frames. The invention is a surface photon crystal film of reflecting whole visible light, which is deposited on a surface of a concave substrate, diffusing reflecting properties of photon crystals in a large range of the whole visible light are used, visible light density on dye-sensitized solar cells through obtained surface mirrors are increased, when the whole visible light condensers which are obtained by the invention are applied for solar cells, and thereby photoelectric conversion efficiency of the dye-sensitized solar cells can be increased clearly under the condition of same light intensity.

The invention discloses a modified asphalt coating material and a preparation method thereof and a mineral pellet-modified asphalt waterproof coil material and a preparation method of the mineral pellet-modified asphalt waterproof coil material. The modified asphalt coating material includes: in parts by mass, 45-50 parts of petroleum asphalt, 5-10 parts of hot-mix asphalt, 12-15 parts of SBS, 2-4parts of polyethylene wax, 2-5 parts of tackifying resin and 20-35 parts of filler. Through the mineral pellet-modified asphalt waterproof coil material, the defects of insufficient base strength ofexisting waterproof coil materials, poor adhesion of mineral pellets, no owning of fluidity and heat resistance of the coating material and the like can be overcome, the use demands of passive buildings for special mineral pellet surface modified asphalt waterproof coil materials can be satisfied, and the gap in the domestic market is filled up, so that a relevant technology is provided for special waterproof coil materials of passive buildings in China, a guiding significance is achieved.

The invention discloses a CoS graded nano-bubble composite S positive electrode material of a lithium sulfur battery, and belongs to the technical field of the lithium sulfur battery. The preparationmethod of the CoS graded nano-bubble composite S positive electrode material comprises the steps of firstly, synthesizing TiO2 composite hexadecylamine nanoparticle by hydrolysis of titanium isopropoxide; secondly, coating a surface of the TiO2 composite hexadecylamine nanoparticle with a layer of MOF-loying PVP so that the TiO2 composite nanoparticle can be absorbed during the growth process of ZIF67 and a surface is embedded and an interior are buried onto ZIF-67 to form a Chinese data structure; and finally, performing vulcanization to obtain a CoS graded nano-bubble material with a plurality of CoS hollow spheres sleeving a CoS hollow polyhedron by hydrothermal method of thioacetamide, and injecting S into the CoS graded nano bubbles by a melting method to obtain a final material. TheCoS graded nano-bubble composite S provided by the invention is used as a lithium sulfur battery positive electrode, relatively high charge-discharge performance and stable cycle property are shown, and the important application value in the field of the lithium sulfur battery is achieved.

The invention discloses antibacterial and anti-virus applications of marine bacillus amyloliquefaciens 1A in fruit postpartum pathogenic fungi. The fruit postpartum pathogenic fungi are colletotrichum gloeosporioides, coniella diplodiella, pear alternaria alternata and penicillium italicum. The separating method of the marine bacillus amyloliquefaciens 1A comprises the following steps: collecting seawater, sea mud, marine debris, clam, enteromorpha and mudskipper samples in Lianyungang sea area; carrying out separation and purification of bacteria after enriching, so as to obtain a plurality of pure strains of marine bacteria; determining the inhibiting effects of the pure strains of the marine bacteria on the four fruit postpartum pathogenic fungi for a test by using a plate confrontation method; screening to obtain the strains of which the width of the bacteriostatic band is greater than 5mm; determining the bacteriostatic action of sterile fermented liquid on the four fruit postpartum pathogenic fungi by using an oxford cup method; and screening to obtain the bacillus amyloliquefaciens 1A of which the width of the bacteriostatic band is greater than 10mm. Therefore, the marine bacillus amyloliquefaciens 1A has a broad application prospect.

The invention discloses a method for preparing konjac mannan oligosaccharide. The method comprises the following steps of: 1) uniformly mixing konjak and water, cutting and emulsifying; homogenizing under the pressure of 160 to 250 MPa and the pressure of 450 to 650 MPa in turn; and drying to obtain coarse konjak powder; and 2) performing enzyme hydrolysis reaction on the slurry of the coarse konjak powder and endo-mannase to obtain the generation liquid of the konjac mannan oligosaccharide, and continuously taking the generation liquid of the konjac mannan oligosaccharide out; replenishing the slurry of the coarse konjak powder once every 3 to 6 hours of the reaction; after replenishing for 9 to 20 times, reacting for 3 to 6 hours and stopping; and collecting and merging the generation liquid of the konjac mannan oligosaccharide, and drying to obtain the konjac mannan oligosaccharide. By the method, the effect and utilization rate of the mannase can be improved and the target productof the mannan oligosaccharide can be obtained to the maximum extent, and the purity of the product is over 90 percent.

The invention relates to a heat exchange tube internal radial direction ladder-type rotor, comprising a hollow shaft and ladder-type blades, wherein the ladder-type blades are arranged on the surface of the hollow shaft. The heat exchange tube internal radial direction ladder-type rotor is characterized in that: the outer diameter of each ladder-type blade is less than the inner diameter of a heat exchange tube; the surface of the ladder-type blade is smooth; the ladder-type blades are arranged around the hollow shaft and are in spiral shapes; the ladder surface structure or a wave-type structure is arranged on both the upstream face and the downstream face of the ladder-type blade along the radial direction of the hollow shaft; and the edge of the ladder-type blade firstly touching the water flow presents an inverted oblique angle or an inverted round angle. In the invention, axial force is generated to the ladder-type rotor when heat transfer fluid in the heat exchange tube flows and the flow of the fluid is hindered by the blade, therefore the flow direction of the fluid is changed and mixed flow is formed; in the meantime, the rotor is driven by the fluid to turn; the mixed flow of the heat transfer fluid is strengthened; part heat transfer fluid flows along the ladder surface of each blade and finally leaves the ladder surface to do eccentric exercise and is thrown to the inner wall surface of the heat exchange tube; thereby the fluid boundary layer at the inner wall surface is impacted and further the heat transfer is strengthened.

The invention relates to a method which can recycle waste liquor discharged in a molasses alcohol production process in a simple, safe and environmentally-friendly way. Alcohol waste liquor is delivered to a field which is to be ploughed and planted or is planted with crops by a tank truck and sprayed onto the ground; and after being fully contacted with the air, the waste liquor is fermented and oxidized rapidly, so that the effects of fighting against drought, conserving water, enriching soil and improving the soil are achieved and 5 to 15 tons of waste liquor is applied to every mu (666.7 mm<2>) of the field. The method has the characteristics of safely treating the alcohol waste liquor in time, eliminating a sewage treatment system with a high investment, improving the microorganism environment of the soil, enhancing soil fertility and realizing cyclic economy, along with simpleness, practicability, a small number of investments, no environmental pollution and full utilization of the alcohol waste liquor.

The invention provides a preparation method of an antibacterial chitosan quaternary ammonium salt. The preparation method comprises the following steps: 1) preparing a chitosan solution; 2) adding a long alkyl chain epoxy quaternary ammonium salt and a short alkyl chain quaternary ammonium salt, and carrying out a reaction; and 3) settling the reaction liquid of the step 2), and carrying out washing and drying, so as to obtain a product. As the long alkyl chain epoxy quaternary ammonium salt and the short alkyl chain quaternary ammonium salt are cografted on chitosan, antibacterial chitosan has intensive electropositivity, and can be well combined with a bacterial membrane with negative electricity, and thus an antibacterial effect can be improved. The cografting ratio of the two components is optimized and adjusted, so that the biocompatibility of the antibacterial chitosan can be effectively improved while an antibacterial effect is ensured

The invention provides an improved main frame of an offshore net cage. The main frame consists of a floating pipe, and is characterized in that the floating pipe is a hollow elliptical pipe with a horizontal long axis and is prepared by processing a round pipe with relative draught of 10%-20%, and the relative draught refers to the percentage of the ratio of the amount of draught to the blank diameter before flattening. The improved main frame for the offshore net cage is reasonable in structure, high in operability, saved in cost, steady in connection, and improved in stability, anti-typhoon capability and risk prevention capability; and the main frame is mainly used for improving the strength and improving the wind and wave prevention level on the premise of not changing the overall size of an existing main frame, promoting offshore net cage culture to deep open sea areas, and realizing safe culture production in open sea areas with water depth of 20-60m.

The invention provides a magnesium-based wear-resistant damping alloy material and a preparation method thereof. A matrix of the alloy material is provided with a stable plate compound, the damping function of an alloy is improved. The method has the advantages of simple process, low production cost, and suitability for industrial production. In the alloy material, a magnesium alloy is taken as the matrix, and compound complexes are uniformly distributed on the matrix of the magnesium alloy. The alloy material comprises the following chemical compositions in percentage by weight: 5 to 9 percent of Al, 2 to 4 percent of Sr, 2 to 3 percent of Sn, 0.5 to 3 percent of Fe, 0.03 to 0.09 percent of C, 0.5 to 1.5 percent of Dy, 1.1 to 3 percent of Y, 0.5 to 2 percent of La, and the balance of Mg.

The invention relates to a composite type reinforced concrete rust inhibitor. The composite type reinforced concrete rust inhibitor comprises the following components by weight percent: an anode type rust inhibitor adopts 20.0 to 30.0 percent of calcium nitrite and 10.0 to 15.0 percent of sodium benzoate; and a cathode type rust inhibitor adopts at least one of sodium hexametaphosphate and zinc oxide, wherein the cathode type rust inhibitor comprises 1.0 to 3.0 percent of sodium hexametaphosphate, 2.0 to 4.0 percent of zinc oxide, 0.001 to 0.005 percent of air entraining agent and the balance of volcanic ash. The rust inhibitor can effectively retard and prohibit the corrosion of reinforcing steel bars in reinforced concrete and can prohibit or delay the destruction of chlorine ions to a reinforced passivating film. The invention has the advantages of little use quantity, use quantity reduction of a single rust inhibitor and the like, is a high-efficiency concrete reinforcement rust inhibitor and can be widely applied to the fresh reinforced concrete structure of the engineering of seaports, railways, coastal buildings, civil buildings and the like.

The invention discloses a medium-frequency-agile all-fiber coherent wind lidar system. A microcontroller module in a tunable fiber laser controls frequencies of output laser light of a first light source and / or a second light source to achieve agility of the frequencies of medium frequency signals. The medium-frequency-agile all-fiber coherent wind lidar system has the advantages that the system can be for high purposes in complex electromagnetic environments, on one hand, other electronic equipment being operated in medium-frequency bands can be prevented from interfering normal operation of a lidar by tuning the frequencies of the medium-frequency signals of the lidar, so that anti-electromagnetic interference or destruction capability of the lidar system is improved; on the other hand, when the operating medium-frequency signals of the lidar and operating frequency bands of the surrounding other equipment are in interference, the frequencies of the medium-frequency signals of the lidar can be tuned to prevent the lidar from interfering or destructing normal operation of the other electronic equipment when the lidar is in normal operation.

The invention relates to an extraction method of inonotus obliquus polysaccharide. A high-voltage pulse electric field-assisted composite enzyme extraction method is mainly adopted for extracting inonotus obliquus powder multiple times, and the influence of the high-temperature environment of a traditional extraction method on the biological activity of the inonotus obliquus polysaccharide is overcome, and the extraction rate of the inonotus obliquus polysaccharide is improved.

The invention discloses a method for preparing a microwave instant taco through sour dough and belongs to the technical field of food production. According to the method, firstly, liquid sour dough paste fermented through lactobacillus plantarum is prepared; secondly, the sour dough is taken to prepare taco dough, and the taco is prepared through the steps of fermenting, cooking and the like. According to the taco prepared through the method, the product technology can be effectively simplified, the product cost can be reduced, the amount of chemical addition agents can be decreased, the taco can be stored at least for four months at the normal temperature, the shelf expiration date of the product is effectively prolonged, the aging speed of the product is reduced, and the taco has the advantages of being nutrient, health, easy to process and the like.

The invention discloses a bacteria reducing method for freshwater crawfish meat. The method comprises the following steps: (1) selecting a freshwater crawfish raw material; (2) cleaning; (3) carryingout ultra high pressure treatment; (4) soaking: removing a head and a tail of the whole crawfish in the step (3), removing a shell, pulling the crawfish meat out of the shell integrally, putting the crawfish meat in a fresh-keeping liquid, and carrying out ultrasonic treatment, wherein the fresh-keeping liquid is a mixed solution prepared with an acidic electrolyzed water solvent and containing chitosan, epsilon-polylysine, lactic acid, a Chinese yam peel extract and a corn peel extract; (5) carrying out vacuum prepackaging; (6) carrying out electron beam irradiation treatment: carrying out electron beam irradiation treatment of the crawfish meat after being vacuum-prepackaged in the step (5); and (7) storing. The method can inhibit the growth of exogenous microorganisms of raw crawfish meat of the freshwater crawfish, well keeps the color and texture characteristics of the crawfish meat, delays oxidation of proteins and degradation of astaxanthin, has no significant influence on the meat quality, color and odor of the crawfish meat, and solves the problem of difficult fresh keeping of raw crawfish meat.

The invention relates to a grooving spiral curling rotor in a heat exchange tube. The rotor is composed of a hollow shaft and a blade, wherein the hollow shaft is of a tubular structure; the blade is located on the outer surface of the hollow shaft; the blade surface is smooth and spiral around the hollow shaft; the blade of the rotor is composed of a grooving blade and a curling blade; a water-facing surface of the grooving blade is provided with a diversion trench structure along the radial direction of the hollow shaft; the radial thickness of the grooving blade is reduced; a water-back surface is not provided with a diversion trench structure; the edge of the grooving blade in contact with the fluid first is subjected to beveling or rounding; and a curling structure is arranged at the top end of the curling blade and is in transition connection through a smooth curved surface. In the invention, when the grooving blade rotates, the heat transfer fluid generates centrifugal movement along the surface of the diversion trench and is thrown to the wall of the heat exchange tube; a curling structure is arranged at the top end of the curling blade; and the rotor can realize a good self-centering effect when rotating in the fluid according to the self-suspension mechanism of the curling blade so as to reduce the scraping effect between the top end of the blade and the inner wall of the heat exchange tube and increase the fluid turbulence degree.

The invention discloses a medium-high temperature SCR denitrification catalyst with an effect of resisting alkali metal poisoning and a preparation method of the medium-high temperature SCR denitrification catalyst with the effect of resisting the alkali metal poisoning. The catalyst is prepared from the following components in percentage by mass: 1 percent of V2O5, 5 percent of WO3, 10 percent of CeO2, and the balance of TiO2. The preparation method of the catalyst comprises four steps: preparation of impregnation liquid, supporting of active components, ultrasonic impregnation and roasting. The catalyst disclosed by the invention is modified by the added CeO2; more surface acid sites and chemical adsorption oxygen are formed to facilitate adsorption and oxidation of NH3 on the surface of the catalyst; by using a V-O-Ce active center formed by a synergistic effect between V and Ce, the active center of the V can be effectively prevented from being damaged by alkali metal, and further denitrification performance and performance of resisting the alkali metal poisoning are greatly improved. The preparation method of the catalyst, disclosed by the invention, is simple, distinct in flow, easy to operate and safe; the prepared catalyst has remarkable advantage in flue gas of which the content of the alkali metal is higher.

The invention relates to a multi-axis low-rotating-speed spiral rotor in a heat exchange tube. The multi-axis low-rotating-speed spiral rotor mainly comprises a hollow shaft, turbulence shafts and spiral blades, wherein the spiral blades are positioned on the surface of the hollow shaft; the outer diameter of each spiral blade is smaller than the inner diameter of the heat exchange tube; the surface of each spiral blade is smooth; the spiral blades take a shape of spiral around the hollow shaft; a turbulence shaft structure is arranged on an upstream face of the spiral blades in the axial direction of the hollow shaft, so as to effectively increase tangential velocity and radial velocity of fluid; the cross sections of the turbulence shafts are partially circular or partially oval; the axial length of each turbulence shaft is equal to or smaller than that of each spiral blade; the turbulence shafts and the hollow shaft are parallel or form included angles with a certain degree; and a downstream face of the spiral blades does not have the turbulence shaft structure so as to reduce pressure loss when the fluid passes the rotor. According to the invention, the bending direction of crimping edges at the tops of the spiral blades is opposite to rotating direction of the spiral blades, so that on the premise of not increasing radial height of the blades, the radial velocity of the fluid is increased, the axial acting force of the rotor is reduced, the radial perturbation of the rotor to the fluid is enhanced, and the self-aligning effect is good.

The invention relates to a pipe network AI intelligent monitoring method and system, a readable storage medium and equipment and belongs to the technology field of monitoring. The method comprises steps of acquiring a shot image of the position of the pipeline in the pipe network; determining a control area for the pipeline in the shot image, identifying whether an object capable of damaging the pipeline exists in the shot image or not; if such an object exists, judging whether the object is in a control area or not; if yes, representing that the risk that the object damages the pipeline in the management and control area exists; at the moment, prompt information of the object invading the pipeline area can be generated; monitoring workers are reminded to pay attention to and be alert to the situation; according to the scheme, the object possibly damaging the pipeline can be automatically identified; early warning is carried out in time before the pipeline is damaged, the problems thatin a traditional scheme, the workload of personnel for inspecting the pipeline is large, or time and labor are wasted when a monitoring video is checked are solved, the pipeline in a specific place needing to be protected can be monitored and alarmed in an all-around and all-time mode, and the effect of preventing the pipeline from being damaged is enhanced.

The invention relates to a method of filling a fast excavation tunnel with a hydrofracturing chemical expanding agent. In normal production of underground rock engineering, water detecting boreholes bored in front to learn forward geological conditions are used, and related regulations of water detecting are strictly abided before boring. The boreholes are arranged in a fan shape, and the other is located in the middle. Multiple wedge-shaped grooves are formed in all the boreholes with a grooving drill, then water is injected at high pressure, and stress of water pressure in the wedge-shaped grooves acts in a concentrated mode to break integrity of surrounding rock. The characteristic that the size is increased when the expanding agent is coagulated is used, and a coagulator is injected after hydrofracturing, and cracks in the boreholes grown more completely. A related chemical solution is prepared according to chemical components of rock and is injected into the boreholes. Chemical reaction of the chemical solution and the surrounding rock can reduce mechanical strength of the rock. The boreholes needed by water detecting are used and combined with chemical and physical methods during practical application, and the purpose of fast excavation face pushing can be achieved.

The invention provides a hard rock cutterhead and a cantilever heading machine comprising the same. The hard rock cutterhead comprises a conical cutterhead main structure; the cutterhead main structure comprises a head, spokes and a flange; the head is connected with the spokes, the spokes are connected with the flange, and the head and the spokes are provided with detachable cutters. The cantilever heading machine comprises the hard rock cutterhead. The hard rock cutterhead and the cantilever heading machine comprising the same have the advantages that the stress of the cutterhead structure is more uniform, the deformation resistance and break resistance are high, and the high-thrust high-rotation-speed excavating working condition can be borne; the cutterhead is formed by machining a complete plate or welding steel plates, and the overall strength and stiffness are better; the cutters adopt the form that end covers are located on cutter seat installation surfaces, and the rock breaking efficiency can be improved; a cutterhead center hobbing cutter can be drawn back when the cutterhead conducts swing cutting, and eccentric abrasion, cutting edge breaking and other abnormal damageoccurring to the center hobbing cutter are effectively avoided; hobbing cutters and toothed cutters are subjected to interchange installing, soft soil excavation can be achieved, and in addition, hardrock can be subjected to expanding excavation; and the cutterhead swings up and down as well as leftwards and rightwards, and round and special-shaped fracture surfaces can be excavated.

The invention relates to a method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS). The method specifically comprises the following steps: (1) treating residual active sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant as a fermentation raw material, and naturally settling to remove liquid supernatant to concentrate and treat to obtain a sludge sample; (2) mixing and pre-treating the sludge sample with potassium peroxymonosulfate sulfate compound salt (PMS), and fermenting under an anaerobic environment to generate fatty acid. After residual sludge is subjected to PMS pretreatment, dissolving of organic substances in sludge is quickened, and activity of acid-consuming microorganisms such as methanogenic bacteria is further inhibited sufficiently, and therefore, the acid yield is greatly increased, and sludge anaerobic fermentation time is shortened; and moreover, the method provided by the invention is simple in operation, and has important environment-friendly ecological significance for reducing, recycling and stabilizing sludge.

The invention discloses a method for preparing an SSZ-39 molecular sieve by taking a fluorine-modified Y-type molecular sieve as a raw material. The method comprises the following steps: dipping a Y-type molecular sieve in a fluorine-containing aqueous solution, and drying and roasting the Y-type molecular sieve to obtain a fluorine-doped Y-type molecular sieve; mixing and stirring deionized water, an alkali source, a template agent and a silicon source well in proportion, and adding the fluorine-doped Y-type molecular sieve to prepare sol; and transferring the sol into a crystallization kettle, filtering, washing and drying the crystallization product after complete crystallization, carrying out ion exchange, and carrying out roasting to obtain a hydrogen type SSZ-39 molecular sieve. According to the invention, the Y-type molecular sieve raw material is modified by a fluorine doping method, so that the SSZ-39 molecular sieve can be prepared by complete crystal transformation in a short time under the condition of relatively low silica-alumina ratio, and the raw material and production costs can be obviously reduced. The SSZ-39 molecular sieve prepared by the method has the characteristics of short crystallization time, high crystallinity, controllable grain size, good grain dispersity and the like, and can be applied to the fields of methanol-to-olefin reaction, carriers of selective catalytic reduction catalysts and the like.