70results about How to "Huge benefits" patented technology

The invention relates to a water-based macromolecule-isocyanate straw hard board and a preparation method thereof. Straws of rice, wheat, corn or other crops, a water-based macromolecule-isocyanate adhesive and a straw interface performance modifying agent are used as raw materials, and the straws are treated by section cutting, kneading and modification, adhesive application and heat pressing to produce the water-based macromolecule-isocyanate straw hard board. A mixture ratio of the absolute dry straws to the water-based macromolecule-isocyanate adhesive to the straw interface performance modifying agent by weight is 100 to 10-16 to 0.05-0.15. The straw hard board uses the water-based macromolecule-isocyanate adhesive to replace a pure isocyanate adhesive, radically improves the problems of toxic organic volatiles, poor prepressing performance, adhesion on boards, etc., remarkably reduces cost and really realizes green production, and the raw materials after the treatment of kneading and modification have good prepressing and molding performances and high one-off qualified rate. The water-based macromolecule-isocyanate straw hard board has the characteristics of unique design, long active period, excellent aging, water and heat resisting performances, simple operation, easy availability of equipment, no environmental pollution, easy implementation, etc., and produces huge entironmental, social and economical benefits after the water-based macromolecule-isocyanate straw hard board is popularized.

The invention discloses a new method for building a rock creep constitutive model on the basis of a variable fractional derivative. The method comprises the following steps of building a variable-fractional-derivative creep model, obtaining experimental data and carrying out parameter fitting. A whole-process creep curve, especially non-linear acceleration creep features, can be described on the basis of the model built through the method. The variable fractional derivative can fully reflect the feature that the properties of rock will change along with time in the creep process, the rock creep constitutive model built through the variable fractional derivative is simpler and more effective, acceleration deformation of a rock mass can be accurately judged and predicted, reasonable protective measures are taken, engineering loss is reduced, and huge engineering application value and economic benefit are achieved.

The invention discloses a reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways. The expanded and excavated stations are simply supported frame wall column type double-layer subway stations in structural forms. The reversed construction method includes retaining soil and water by the aid of piles in rows and waterproof curtains or underground diaphragm walls, and resisting lateral deformation of soil mass; excavating the soil mass between openings of parallel shield tunnel segments and constructing cross passages; grouting and reinforcing the soil mass above tunnels, building foundation pit excavation supporting structures and short supporting piles of station bodies and connecting the tops of the foundation pit excavation supporting structures and the short supporting piles with the outer piles in the rows or the outer underground diaphragm walls by connecting beams; constructing the structures of the station bodies by the aid of cover and excavation top down processes, filling the station bodies with the soil mass and recovering road surfaces. Foundation pit slopes can be supported by the aid of composite soil nailing supporting technologies in excavation procedures. The reversed construction method has the advantages that the reversed construction method is reasonable and feasible, is high in operability and has important engineering application value and an important development prospect, and huge economic, social and environmental benefits can be brought by application of the reversed construction method.

The invention relates to a stud connection-based steel-concrete composite beam calculation model analysis method. The method comprises the following steps of 1, building a stud shear connector composite beam calculation analysis model; 2, proposing that the overall shear stiffness Dsc of a stud comprises the shear stiffness Ds of the stud and the stiffness Dc of concrete in the range of a concentric circle with the diameter nds; 3, introducing a reduction coefficient beta of a working state of the overall shear stiffness of the stud to obtain equivalent lateral stiffness Deq; and 4, accordingto a lateral stiffness equivalence principle, making the stud equivalent to a short steel beam unit, and proposing that different values of the equivalent diameter deq of the short steel beam unit areused for simulating the mechanical performance of the stud in different working states. The method has the advantages that the calculation process is high in efficiency; a calculation result can quantitatively reflect interface slip of a steel-concrete composite structure and stress states of parts in stress periods of the composite structure; the practicality is high; and the method is easily understood and mastered by structure designers.

The invention discloses cultivation feed, particularly relates to breeding ewe complete pellet feed and belongs to the technical field of feed cultivation. The breeding ewe complete pellet feed has the benefits that the nutrition collocation is reasonable, a positive combined effect between roughage (peanut shells, soybean hulls, brewer's grain, apple pomace and the like) and concentrated feed is utilized, the dietary nutrition is balanced and completely meets the production and breeding demands of breeding ewes, the digestion and the utilization of coarse-fibered raw materials are greatly improved, the normal physiological functions of rumens of the breeding ewes are ensured, the feeding process of farmers are greatly reduced at the same time, the production efficiency is improved, the market demands and the benefits are huge, and meanwhile, the multiple coarse-fibered raw materials are utilized by adopting a special processing mode and other measures, so that the social value is higher.

The invention provides four-graded roller compacted concrete suitable for water power hydraulic engineering, the four-graded roller compacted concrete per cubic meter comprises the following components: 49kg-64kg of cement, 78kg-92kg of fly ash, 70kg-71kg of water, 630kg-700kg of sand, 1520kg-1610kg of gravel, 0.98kg-1.42kg of a high efficiency water reducing agent and 0.07kg-0.14kg of an air entraining agent, the mass ratio of super large stone (80mm-120mm): large stone (40mm-80mm): middle stone (20mm-40m m): small stone (5mm-20mm) is 20:30:30:20. The four-graded roller compacted concrete is low in cementitious material use amount and low in adiabatic temperature rise, has good working performance, mechanical performance and durability, and can simplify the temperature control measures, improve the construction progress, and reduce cost.

The invention discloses ultra-large linear energy input welding high-strength steel and a production method thereof, and solves the problems of high alloying cost, poor welding performance of steel plates and low HAZ impact toughness of the conventional large linear energy input welding high-strength steel. The steel comprises the following chemical compositions in percentage by weight: 0.02 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 0.60 to 1.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, 0.0020 to 0.0060 percent of N, 0.0020 to 0.0060 percent of O, and at least two of 0.005 to 0.030 percent of Ti, less than or equal to 0.010 percent of Ca, less than or equal to 0.010 percent of Mg, 0.0003 to 0.003 percent of B, and 0.008 to 0.015 percent of Ce, and the balance of Fe and inevitable impurities. In addition, the chemical compositions meet the following conditions: (1) 4.0C+Mn is less than or equal to 2.1; (2) the carbon equivalent CE is equal to C+Si / 24+Mn / 6+Ni / 40+Cr / 5+Mo / 4+V / 14 and is less than or equal to 0.39. A casting blank with the compositions is prepared through hot metal desulphurization, converter top and bottom blowing, vacuum deep treatment and fine adjustment of the compositions, the casting blank subjected to controlled rolling is air-cooled to room temperature, and the high-strength strong-toughness and excellent-match steel is obtained. The steel has the advantages of high strength, excellent low temperature toughness, and high Z-direction performance, and can bear ultra-large linear energy input (more than or equal to 500kJ / cm) welding.

The invention discloses a sliding platform and a construction method for separately mounting grid structures on high altitudes. The sliding platform for separately mounting the grid structures on the high altitudes is arranged in an industrial factory building. The industrial factory building is provided with crane beams, and overhead crane tracks are arranged on the crane beams. The sliding platform for separately mounting the grid structures on the high altitudes comprises a grid structure type sliding platform, a scaffold operating platform and pulling equipment. The grid structure type sliding platform is slidably arranged on the overhead crane tracks via a plurality of sliding rollers; the scaffold operating platform is arranged on the upper surface of the grid structure type sliding platform; the pulling equipment is connected onto the grid structure type sliding platform, so that the grid structure type sliding platform can slide along the overhead crane tracks. The mounting quality of the grid structures, with bolt-sphere joints, of the industrial factory building can be sufficiently guaranteed, the time and labor can be saved, and the safety of staffs for constructing the grid structures on the high altitudes and the safety of construction staffs below the staffs can be guaranteed. The sliding platform and the construction method have the advantages of flexibility, convenience, speediness and low cost. Besides, merits can become obvious along with increase of ratios of the longitudinal lengths to the span of the grid structure.

The invention relates to a high-early-strength filling material for a coal mine goaf. The high-early-strength filling material is prepared from the following components in parts by weight: 10-20 parts of quick-hardening sulphate aluminate cement, 40-80 parts of coal ash, 150-200 parts of coal gangue particles, 1-3 parts of a content-available superplasticizer and 0.1-1 part of a thickener. The high-early-strength filling material is used for filling the coal mine goaf and is remotely pumped, and is high in strength increase speed and filling efficiency, low in filling cost, safe and environmentally friendly. An experiment shows that the early strength of the high-early-strength filling material is high and can reach 10.0MPa, and the compressive strength can reach 18.0MPa in the 28th day.

The invention relates to an air brick for carbon calcining furnace quirk wall produced by gold gangues and iron gangues, which effectively solves the problems of utilization of the gold gangues and the iron gangues and bad high temperature resistance capability of the existent air brick. The technical scheme includes using gold gangues and iron gangues as the powder raw materials, bauxite as the bone raw materials, andalusite powder as the shrinkproof agent and SiO2 fine powder as the binder, which are prepared in proportion to produce a mixture material, and then adding CA-70 calcium aluminate cement into the mixture as the delayed coagulant agent, PE fiber as the ignition substance and trimetric sodium phosphate as the plasticizing agent, which are all uniformly cast into the air bricks. The invention effectively solves the problems of utilization of the gold gangues and the iron gangues and high-temperature creep resistance performance of the air bricks, prolongs the service life and creates huge social and economic efficiencies.

The invention discloses a transformer substation standard operation firming method which includes steps of operation order selection, identification verification, identification management, electric signing and the like. The transformer substation standard operation firming method is reasonable and capable of effectively improving misoperation prevention effect and achieving twice the result with half the effort in misoperation prevention. In addition, by the transformer substation standard operation firming method, 'technical prevention' measures are utilized fully to overcome defects of 'personal protection', field switching operation standardization, which is a big problem hard to solve for years, is controlled effectively and safely, accident prevention capacity is improved, and field violation and accident generation frequency are suppressed greatly. Accordingly, the transformer substation standard operation firming method has great direct economical benefit for enterprises and indirect social benefit.

The invention discloses a method for optimizing zinc-hydrometallurgy hot acid leaching process by pressure leaching. A new technique is easily engaged with an existing process, and a pressure leaching process is introduced in an existing hot acid leaching process. The method is characterized in that in the process of optimizing, zinc concentrates are leached by using a section of hot acid leaching liquor in a hot acid leaching process, and in the process of pressure leaching, the oxidation and precipitation of iron materials are realized; pressure leaching ore pulp is subjected to solid-liquid separation, liquid supernatant is fed back for neutral leaching, and filter residues are conveyed for flotation so as to enrich sulfur concentrates and iron slag. An associated process provided by the invention is short in process; zinc immersion and iron removal are realized in a reaction container, so that the leaching efficiency is high, thereby realizing the clean production of the zinc smelting industry.

The invention discloses a process for producing electrolytic manganese metal by using charcoal powder to reduce and convert manganese oxide ore. The process comprises the following steps of: crushing and sieving the manganese oxide ore and charcoal respectively, mixing the manganese oxide ore powder and the charcoal powder uniformly in a certain ratio, putting the mixed powder into a rotary roasting furnace, reacting for 1 to 2 hours at a certain temperature under certain pressure intensity so that the manganese oxide ore is reduced into MnO, and leaching in sulfuric acid of certain concentration at a certain temperature to obtain impurity-containing manganese sulfate solution; and preparing electrolyte by the conventional process for producing electrolytic manganese, and performing electrolysis in an electrolytic bath to produce the electrolytic manganese metal. By the process, the problem of tight supply of manganese carbonate ore can be solved, the production cost is remarkably reduced, and the cost of the ore is only 1 / 5 of the total cost of electrolytic manganese production; and compared with the cost of the conventional production process (using manganese carbonate as a raw material), the comprehensive cost of the process can be reduced by 10 to 15 percent.

Disclosed is a fast rooting flowerpot device and a using method thereof. The fast rooting flowerpot comprises a water storage layer, a breathable and water absorbing layer and a colonization layer. Water is discharged automatically through side drain holes when a water supplying level reaches the height of the storage layer. According to the fast rooting flowerpot device and the using method thereof, the existing flowerpot structure in which water enters from the up and drains from the down is improved to a side draining structure, the air hole at the bottom of the existing flowerpot is transferred to the side of the flowerpot, therefore the fast rooting flowerpot can supply more water, nutrients and oxygen for plant growth than the existing flowerpot, satisfy requirements for thriving of the plants, a cover of the flowerpot can be opened from the middle and cover on the fast rooting flowerpot to fix the plants after bypassing roots of the plants, and water capacity in the flowerpot can be adjusted. The fast rooting flowerpot device and the using method thereof have the advantages of being suitable for a plurality of plant cultivation methods, particularly supplying an optimal container for medium cultivating and hydroponic plants, being regarded as an important breakthrough for the existing flowerpots, and suitable for indoor and outdoor potting, home beautification, office green decoration, ecological improvement of air quality, landscaping, building decoration, various kinds of potted plants and the like.

The invention discloses a fiber collimator, which comprises at least one fiber head for accurate positioning and a collimation lens, and a casing for fixing the fiber head and the collimation lens. The fiber head and the collimation lens which are arranged in the casing are aligned end to end; the front end face of the fiber head is in butt joint with the rear end face of the collimation lens; the collimation lens is provided with an optic axis; and the casing is provided with an inherent central axis. The fiber collimator is characterized in that: the rear end face of the collimation lens is vertical to the central axis of the casing; and the distance between the rear end face of the collimation lens and the front end face of the fiber head is equal to the distance between a focal point of the collimation lens and the rear end face of the collimation lens. The surfaces of the fiber head and the collimation lens are subjected to special designs so as to achieve the effects of removing emergent lights or receiving the deflection angle of the light, which also can create huge benefits and advantages.

The invention discloses a method for preparing biodiesel from oil with a high acid value. The method comprises the steps as follows: mixing oil with a high acid value with methanol, adding compound acid catalyst, carrying out esterification reaction, removing crude methanol through flash vaporization, adding potassium hydroxide methanol solution, performing transesterification reaction, removing crude methanol through flash vaporization again, standing liquid from which crude methanol is removed and settling for 4 to 5 hours, and removing glycerol through separation to obtain crude biodiesel.The method has the characteristics of low device investment, simple process, low manufacturing cost, high reaction rate and high conversion rate of products.

The invention relates to a three-dimensional suspended parking device and method. A base plate, a bearing column and a top beam are sequentially welded end to end and form an integrated type frame in a semi-square shape. A longitudinal slide groove is formed in the bearing column, and one side of a wheel grabbing arm is embedded into the longitudinal slide groove of the bearing column. The wheel grabbing arm is connected with an electric motor located on the top beam through a steel cable and makes vertical movement in a tight and perpendicular mode in the longitudinal slide groove of the bearing column under the motor, the steel cable and the wheel grabbing arm self-weight effect. A bicycle is embedded into a groove of the other side of the wheel grabbing arm and linked with the wheel grabbing arm. The device is simple in structure, stable, novel, low in cost and convenient to install, maintain and use, the scheme that the upper portion of the device is used for parking and the portion below the device is used for bicycle and people travelling is unique, the parking spaces can have the probability of exponential order amplification to cope with the parking requirement that due to shared bicycles, the number of the bicycles is increased sharply, installation of the device has nearly zero influence on transportation, and on the contrary, the enormous environment-friendly and economic benefits can be brought to the society.

The invention relates to a surface repairing method of an electrochemical micro additive. The surface repairing method comprises the following steps of: pasting a photosensitive dry film on the surface of a clean and dry cathode workpiece, manufacturing a mask negative film matched with a non-repairing area in shape, placing the mask negative film on the surface of the photosensitive dry film of the non-repairing area, then exposing the cathode workpiece, curing a photosensitive part of the non-repairing area of the cathode workpiece to form a firm and insulated protective film, dissolving thephotosensitive dry film of a non-photosensitive part of a repairing area of the exposed cathode workpiece in a developing solution, and exposing metal of a to-be-repaired area; enabling an anode toolto be in contact with the metal of the to-be-repaired area under certain pressure; continuously injecting an electrolyte between the anode tool and the cathode workpiece at a certain flow rate, and carrying out electrochemical repairing of the micro additive on the to-be-repaired area of the cathode workpiece; after repairing, removing the insulated protective film on the surface of the workpiece; and finally, carrying out heat treatment on the surface of the repairing area of the workpiece to obtain a pre-deposited repairing layer with the thickness of 0.2-10 microns.

The invention discloses a solidification power transformation specification operation system. A data processing module is connected with an information interactive module which is connected with a display screen and a capacitive touch pad, the data processing module is connected with an operation ticket virtual printer module and a fingerprint acquisition module, a power supply module provides power for the modules, all the modules are installed in a shell, a camera, a loudspeaker, a USB interface and a microphone interface are arranged on the shell and connected with the data processing module, and a clamping structure for placing a microphone is arranged on the shell. The solidification power transformation specification operation system is reasonable in structure and capable of effectively improving the working effect of misoperation resistance and plays a role in misoperation accident prevention in the mode of half the work with double results, the ability to prevent accident is improved, times of on-site violation and accident occurrence are greatly restrained, and direct economic benefits of enterprises and indirect benefits of the society are tremendous.

The invention discloses an oil magnetic-suspension double-stator high-efficiency motor, belonging to the technical field of clean energy and energy-saving motors. A first stator and a second stator are arranged on the inner side and the outer side of a rotor; a center and a main shaft are fixed together; and the main shaft supports the rotator to rotate through a second bearing and a third bearing. The oil magnetic-suspension double-stator high-efficiency motor is characterized in that a raised part on the front end of the shell of the rotor penetrates through the end covers of the stators and is used as a transmitting outputting shaft, and the inner wall and the outer wall of the shell of the rotor are provided with permanent magnets. The heat in the motor is discharged along with liquid through a lifting pump, and the heat is returned to the interior of the motor to circulate after flowing through a cooler to be cooled. The weight of the rotor is overcome due to the adoption of the oil magnetic-suspension cooling technology, the bearings have no friction loss and noise, the motor works constantly in the ideal controllable temperature increasing state, the maximization and the stability of the output power are ensured. The oil magnetic-suspension double-stator high-efficiency motor can be used together with an electric vehicle, a giant wind power generator, a large-scale hydroelectric generator, a diesel generators, a large-scale high-speed smelting fan and other equipment as an energy-saving motor or a high-efficiency power generator, thereby having a huge economic benefit and energy saving and environment protecting effects.

The invention relates to an underground cable three-dimensional digital visualized positioning method based on AR and a BIM. Through a GIS geographic information system and the underground cable three-dimensional digitized BIM, AR intelligent hardware positions an underground cable through RIFD electronic tags fixed to the lower portion of a cable trench cover plate and included information, and underground cable three-dimensional digitized real-time dynamic AR display is further achieved through information such as positioning information and azimuth information of the AR intelligent hardware. The whole life cycle process of the transmission and transformation project can be applied simultaneously, and the underground cable three-dimensional digital visualized positioning method has the huge economic benefits and development potential; and meanwhile, the using number of the RIFD electronic tags is decreased greatly, the cost is saved greatly, and the problems of indoor positioning, satellite positioning and RTK modes of the transmission and transformation project are solved effectively.

The invention discloses a novel uninterrupted power supply method and an uninterrupted power source system. The uninterrupted power source system mainly comprises a super capacitor energy storage unit, a compressed air power unit and a monitoring and control unit. When the commercial power supplies power normally, electric power is stored in the super capacitor and the compressed air power unit; when interruption of the electric power occurs, the super capacitor rapidly responds to supply power for electric equipment, and the compressed air power unit further starts to realize continuous long-time power supply; when the commercial power recovers to a normal state, the electrical network electric power is utilized to realize an energy storage process, moreover, compressed air in an air storage tank is supplemented through a compressor. The uninterrupted power source system employs the super capacitor and the compressed air power unit and has advantages of rapid response, low carbon, environmental friendliness, long service life, low maintenance cost and strong adaptation capability.

The invention discloses a chorthippus microspore strain and applications thereof. The chorthippus microspore strain disclosed by the invention is paranosema acridophagus PA-201301 with the preservation number of CGMCC No.7757 in the China General Microbiological Culture Collection Center. The paranosema acridophagus PA-201301 CGMCC No.7757 disclosed by the invention has the advantages of obvious lethal effect to chorthippus dubius, chorthippus fallax, myrmeleotettix palpalis, calliptamus abbreviatus, bryodema luctuosum, oriental migratory locust and gastrimargus marmoratus than that of an existing locust microspore, and stress resistance, in particular strong ultraviolet resistance, wherein the germination rate of spores is still more than 80% after a spore solution is irradiated by the ultraviolet light for one hour; in addition, the production technology of microspores of the chorthippus microspore strain is simple, and propagation hosts are easily obtained; after homogenating, separation is performed at the centrifugal force of about 6000g; the chorthippus microspore strain disclosed by the invention is conductive to mass production and applications.

The invention discloses an integrated household garbage sorting device. The device comprises a machine box, a feeding hopper, an anti-blocking mechanism, a bag breaking mechanism, a material uniformizing mechanism, a conveying mechanism, a magnetic separation mechanism and the like, the feeding hopper is arranged on the top face of the machine box, the anti-blocking mechanism is arranged on the transverse side wall of the feeding hopper, and the bag breaking mechanism is arranged on the longitudinal side wall of the feeding hopper; and the material uniformizing mechanism is arranged at the position, under the feeding hopper, in the machine box, the conveying mechanism is arranged at the position, below the material uniformizing mechanism, in the machine box, the magnetic separation mechanism is arranged at the position, below the high end of the conveying mechanism, in the machine box, a screening mechanism is arranged at the position, below a metal groove, in the machine box, and an air supply mechanism is arranged on the outer surface of the machine box. A pushing mechanism is arranged at the position, above the screening mechanism, in the machine box. According to the integratedhousehold garbage sorting device, the screening modes such as winnowing, magnetic separation and screening are integrated, the whole device is compact in structure, small in occupied area and novel in design, the well garbage sorting effect and higher sorting efficiency are achieved, multiple functions are achieved through one device, and the device is best equipment for household garbage sorting.

The invention provides a method for prolonging the service life of an intermetallic compound and controlling the deformation through laser shock processing. The method comprises the following steps of: step 1. clamping a part; step 2. clearing the part; step 3. arranging an absorbing layer; step 4. applying a constraining layer; step 5. programming; step 6. reinforcing the root of the blade; step7. reinforcing the air intake side and air exhausting side of the blade; step 8. removing the absorbing layer and clearing; step 9. presetting a shape correcting absorbing layer; and step 10. carryingout laser shock processing shape correcting. According to the characteristics of materials and structure of the intermetallic compound blade and the different reinforcing areas, laser shock processing gradient technological parameters are designed to meet the requirements for prolonging the vibratory fatigue life of the blade; and meanwhile, a specific area is selected according to the engineering experience, and a laser shock processing high-frequency shape correcting absorbing layer and process parameters are designed for controlling the deformation of the blade, so that the reinforced blade meets the requirements for fatigue life and deformation control at the same time.

The invention discloses an XPO1 (Exportin 1) inhibitor of which the structural formula F is as shown in the specification. The XPO1 inhibitor has very good solubility in water; by taking sulforaphene as a representative, the compounds have extremely high inhibitory activity to XPO1, tiny side effect, and good biosafety and bioavailability, and are very suitable for clinical application, so that the XPO1 inhibitor has a huge potential market space and economic benefits.

The invention provides a preparation method of Xuanmai Ganjie granules. The method comprises the following steps: decocting and concentrating radix scrophulariae, radix ophiopogonis, liquorice and platycodon grandiflorus; and performing refluxing treatment on the concentrate for 2.5-3.5 hours while keeping the refluxing temperature at 55-65 DEG C to finally obtain granules. In the finished product of Xuanmai Ganjie granules prepared in the invention, the contents of active ingredients, namely harpagoside and glycyrrhizic acid, are remarkably increased, and the treatment effect of the medicine is correspondingly enhanced, which is a great beneficial technical progress; and on the premise of neither increasing production equipment nor changing production flow, low cost and high yield are realized, and tremendous economic and social benefits are created by the most economical way.

The invention provides a method for predicting a necessary net positive suction head of an axial flow pump based on a pump unit, and belongs to the technical field of pumping station projects. Based on the calculation of a three-dimensional steady numerical value of an axial flow pump device, a numerical solution method is adopted to predict the necessary net positive suction head of the axial flow pump of the pump unit under multiple working conditions; the method is simple and convenient, the cost is low, the time-consuming is short, and the necessary net positive suction head of an axial flow pump station under any working condition can be predicted, so that the accidental working condition that the physical model test is not measured or the pump station is running can be made up. The method for predicting the necessary net positive suction head of the axial flow pump based on the pump unit provided by the invention helps to compare the cavitation performance of the axial flow pump device under different hydraulic models, helps to the safe and stable operation of an actual pumping station, avoids cavitation of the axial flow pump station, and achieves the purpose of ensuring the safe and stable operation of the axial flow pump.

The invention discloses production and installation methods for a concrete embossment decorative plate. The production method comprises the steps of lofting and decomposition of unit embossment bodies, manufacturing of a unit gypsum male die plate, coating of die releasing wax, concreting to form a female die plate, coating of silica gel on the female die plate, forming of a silica gel isolation layer, manufacturing of steel frame meshes, fixing of embedded parts and hoisting hooks, pouring of fine aggregate concrete and manufacturing of the moulded concrete embossment decorative plate. The installation method comprises the steps of measurement and lofting, machining and installation of supplementary embedded parts on an upper cross beam and a lower cross beam of a building, installation of connectors, steel stand columns and the cross beams, installation and fixation of the concrete embossment decorative plate on a metal framework, throwing of sealing gum, and spraying of metal fluorocarbon coating on the outer surface. The methods are low in total investment and rapid in construction effect, greatly reduce the project manufacturing cost and have great economic benefits and popularization prospects. The decoration project completed through the methods is spectacular, exquisite in pattern, strict in structure and perfect in workmanship.

The invention discloses a preparation method of a welding steel plate with large energy input. The steel plate comprises C, Mn, Si, Ni, Cr, V, Ti, P, S, O, Als, Ca and Fe. The preparation method comprises following steps of: desulfurizing molten steel, smelting in a converter or an electric furnace, blowing bottom argon to a steel ladle or a ladle furnace to perform refining, performing continuous casting and rolling to obtain a plate, wherein ferrovanadium, ferronickel and ferrotitanium are added together with waste steel at first during the smelting step in the converter or the electric furnace; ferrochromium and calcium wires are added during the refining step so that chemical components in the steel satisfy requirements of components of the steel plate; the temperature of the molten steel added into a crystallizer during the continuous casting step is controlled to be 1530-1550 DEG C; and in the rolling step, the starting rolling temperature is 1200-1220 DEG C, the accumulated reduction rate of last three controlled rolling steps is not less than 42%, and the finish rolling temperature is 880-900 DEG C.