80results about How to "Meet engineering application requirements" patented technology

The invention discloses a core-shell type ammonium polyphosphate synergetic flame-retardant polyurethane elastic composite material and a preparation method thereof, which is characterized in that the polyurethane elastic composite material containing core-shell type ammonium polyphosphate can be obtained by melting and co-mixing 75-94.9% of polyurethane, 5-25% of core-shell type ammonium polyphosphate and 0.1-5% of synergistic agent at the temperature of 160-220 DEG C for 5-30 minutes by weight percentage. The composite material can ensure that the adding amount of flame retardant is reduced while ensuring the flame retardance effect, and the composite material has good resistance of melt drip, simultaneously improves the shortcoming of poor water resistance of the flame-retardant composite material containing the ammonium polyphosphate, enhances the compatibility of the flame retardant and a polyurethane elastomer and improves the mechanical properties of the material, such as tensile strength, fracture strength and flame retardance performance, thereby meeting the requirements of fire protection safety and engineering applications.

The invention relates to an acidic coating super duplex stainless steel welding rod and belongs to welding material technology. The invention adopts 2507 duplex stainless steel wires as the welding core; the components and the weight percentages of the components of the welding rod coating are as follows: 30-40 of rutile, 3-7 of titanium dioxide, 15-20 of potash feldspar, 1-3 of phlogopite, 5-10 of marble, 16-20 of metal powder, 0.5-1.5 of rare earth fluoride, 2-3 of cryolite, 5-8 of chrome green, 0.5-1.0 of soda, and 1.5-3.5 of ferroalloy. The welding rod of the invention has the advantages, showed by the test results of manufacturability, metallographic observation, mechanical property and corrosion resistance, that the welding rod has extremely good welding technical property; electric arc is stable during welding, and spattering does not basically exist; the formation of weld joints is good; slag detachability is good; the manipulability of the welding rod is excellent; through metallographic observation, the content of ferrite in the structure of welding joints ranges from 40 percent to 60 percent, and the phase ratio can meet engineering application requirement; the welded welding joint has excellent mechanical property, and tensile strength can be more than 800 MPa; low temperature toughness is good; the stress corrosion resistance and pitting corrosion resistance of the welding joint are excellent.

The invention discloses a nano composite expansion flame retardant polyurethane foamed plastic and a preparation method thereof. The nano composite expansion flame retardant polyurethane foamed plastic is characterized in that the preparation method comprises the following steps: evenly mixing 40 to 80 percent of polyol, 0.1 to 3 percent of foaming agent, 0.1 to 2 percent of foam stabilizer, 0.1 to 2 percent of catalyst, 0.5 to 4 percent of expandable graphite, 0.5 to 9 percent of halogen free phosphate ester or phosphonate ester and 0.5 to 5.5 percent of organic modified nano inorganic filler by weight percentage; and then mixing the mixture evenly with two or more isocyanate polyisocyanate compounds in the weight ratio of 1:2-2:1, and injecting the mixture into a die at 5 to 40 DEG C for foaming. The obtained nano composite expansion flame retardant polyurethane foamed plastic product effectively reduces the heat release rate and the total heat release amount of the material, improves the oxygen index and the vertical firing flame retardant property of the material, reduces the effect of an expansion type flame retardant on reducing the mechanical properties of the material, and meets the requirements of fire safety and project application.

The invention discloses low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and a production method thereof, belonging to the technical field of medium-thickness plate production and longitudinal submerged arc welded tube production. A steel plate comprises the following chemical components in percentage by mass: not less than 0.04% and not greater than 0.09% of C, not greater than 0.35% of Si, not less than 1.5% and not greater than 1.85% of Mn, not greater than 0.012% of P, not greater than 0.004% of S, not less than 0.02% and not greater than 0.05% of Nb, not less than 0.008% and not greater than 0.025% of Ti, not less than 0.10% and not greater than 0.50% of Ni, not less than 0.10% and not greater than 0.45% of Cr, not less than 0.10% and not greater than 0.30% of Cu, not less than 0.10% and not greater than 0.35% of Mo, not less than 0.020% and not greater than 0.070% of Alt, not greater than 0.0005% of B, not greater than 0.0050% of Ca, and the balance of Fe and inevitable impurities. A preparation method of the steel plate comprises the processes such as converter smelting, external refining, continuous casting, heating, controlled rolling, relaxation phase change control and quick cooling; a texture of the rolled steel plate is ferrite, bainite and a little M / A (Martensite / Austenite), wherein ferrite content is 60%-85%, and bainite and M / A content is 15%-40%. The obtained X80HD large-deformation pipeline steel has high strength and toughness, a high work-hardening index, high uniform ductility, a low yield ratio and good deformation resistance.

The invention discloses a multi-view pointer type instrument identification method and device. The method comprises the following steps of: image acquisition; image pre processing; instrument automatic positioning cutting; instrument image correction; instrument pointer information extraction; and instrument reading automatic generation. According to the multi-view pointer type instrument identification method of the invention, instrument images are corrected, and therefore, the problem of a traditional instrument identification method cannot identify instruments under transformation situations such as perspective, translation and affine can be solved. With the multi-view pointer type instrument identification method and device of the invention adopted, much prior knowledge of instruments is not required, and artificial participation can be simplified, and the automation degree of identification can be improved. The multi-view pointer type instrument identification method and device have high robustness and high recognition accuracy as for surface damage, slight light reflection and slight jitter of instruments.

The invention discloses a scale-inhibition copper-based catalyst alloy and a preparation method thereof. The catalyst alloy comprises the following components in percentage by weight: 40%-70% of Cu, 5%-20% of Ni, 10%-35% of Zn, 5%-30% of Sn, 0.5%-20% of Ag, 0.1%-8% of Fe, 0.01%-2% of Sb and 0.05%-5% of Mn, wherein the components are chemically compounded to form a columnar crystal alloy directionally growing along an S100 crystal axis. The scale-inhibition copper-based catalyst alloy is used for inhibiting the formation of water scale by virtue of an advanced weak-current composite scale-inhibition mechanism on the premise that chemical components of fluid are not changed and has very strong water scale dissolving capacity; the additional maintenance does not need to be carried out in an operation process, the magnetism, the electricity and an additional power supply are not required.

The invention discloses a low-hydrogen type super duplex stainless steel welding rod. The prior duplex stainless steel wire is adopted as a welding core. The coating of the welding rod comprises the compositions in percentage by weight: 35 to 45 percent of marble, 20 to 33 percent of fluorite, 0 to 5 percent of titanium pigment, 2 to 5 percent of potassium feldspar, 0 to 2 percent of sodium carbonate, 5 to 15 percent of iron alloy, 10 to 20 percent of metal powder, and 0 to 2 percent of CrN iron, wherein the iron alloy consists of ferrosilicon and ferromolybdenum under the condition of constant total content, and the metal powder consists of manganese metal, chromium metal, and nickel powder under the condition of the constant total content. After raw materials of the compositions of the coating are mixed evenly, pure sodium water glass with certain Baume concentration is added, and the pressing of the welding rod is performed on welding rod production equipment. The use of the welding rod can satisfy the welding need of super duplex stainless steel in the national engineering construction, the welded welding seam has excellent mechanical property and good corrosion resistance, the tensile strength can reach 800MPa, and the welding rod has good low-temperature toughness.

The invention discloses a method for improving intrusion event identification accuracy based on a phase-sensitive optical time domain reflectrometer (phi-OTDR). The method includes the steps of 1), data acquisition; 2), single-point historical judgment; 3), regional vibration group judgment. The method is characterized in that the single-point historical judgment and the regional vibration group judgment are combined, M-frame real-time data detected by a phi-OTDR data acquisition system before current time are taken as analyzing samples, two steps of judgment are performed, and the single-point historical judgment removes thresholds to extract first-step characteristic quantity through adaptive mean values from the angle of variation amplitude of the M-frame real-time data before the current time; the regional vibration group judgment further extracts vibration characteristic quantity, namely the final vibration characteristic quantity, on the basis of the first-step characteristic quantity. The method has the advantages that the vibration characteristic quantity is extracted from the angles of a time domain and a spatial domain, intrusion event identification accuracy can be greatly improved, and meanwhile, engineering application requirements on timeliness is met, simpleness in calculation is achieved, and positioning stability is good.

The invention provides a high-precision point cloud registration method for three-dimensional laser scanning. The method comprises steps of providing strategy of two steps from preposed coarse registration to iterative fine registration; carrying out curvature-based feature extraction on scattered point clouds which are obtained through three-dimensional laser scanning and have different visual angles to obtain feature points; and calculating coordinate transformation parameters of the matched feature point pairs to obtain a preposed coarse registration result, eliminating wrong homonymous points by using a distance constraint condition for the condition that the two-point cloud data is not in a subset relationship, and then performing iterative fine registration to obtain a final registration result. Feature point extraction is rapid and accurate, feature point matching accuracy is high, speed is high, coarse registration provides a good initial position for fine registration, after iterative fine registration is iterated to a certain number of times, an accurate result can reach very high precision, registration precision can reach the millimeter level, the method can be used forcomplex point cloud data, and engineering application requirements are met. The point cloud registration speed and precision are greatly improved, and the registration method is wide in application range.

The invention discloses an on-line modeling and optimizing method suitable for recovering coking coarse benzene, and belongs to the field of recovery of coking chemical products. The on-line modeling and optimizing method is characterized by providing a method for one-line modeling and multi-object optimization on coarse benzene recovery. In the invention, a coarse benzene recovery process flow model is established by combining mechanism analysis, multiple regression and system identification modeling, so that the behavior of the system can be accurately described and the requirement for a detection device is reduced; and the coarse benzene recovery multi-object function as an object is provided and the solving is carried out by adopting a particle swarm optimization algorithm so as to obtain the optimized variable of the operation process. The on-line modeling and optimizing method has the advantages of high speed and high efficiency. In addition, by setting an adjustable object weight, the requirement for people on manual adjustment on the specific gravity of single object can be met. The excellent performances of the on-line modeling and optimizing method can be proved through actual production data.

The invention relates to the technical field of building materials, in particular to an inhibitor capable of inhibiting efflorescence of alkali-activated slag cement and adjusting the performance of the alkali-activated slag cement, and a preparation method of the inhibitor. The alkali-activated slag cement efflorescence inhibitor is characterized by being prepared from the following raw materials by mass percent: 10-30% of zeolite, 10-20% of silica fume, 20-30% of pulverized fuel ash, 5-15% of boric acid and 5-55% of superfine slag powder. The alkali-activated slag cement efflorescence inhibitor provided by the invention is simple to prepare and use, and has a certain retarding effect; after the efflorescence inhibitor is added into alkali-activated slag cement concrete and mortar, the working performance of the alkali-activated slag cement concrete and mortar can be improved, the engineering quality is improved after construction, the early strength and later strength of the alkali-activated slag cement concrete can be increased by 15-20%, the efflorescence probability of the alkali-activated slag cement concrete is greatly reduced, and the reduction magnitude reaches up to 80%; the alkali-activated slag cement efflorescence inhibitor can inhibit the efflorescence phenomenon of the alkali-activated slag cement after construction, and has an inhibiting effect on the efflorescence phenomenon of the building materials after construction.

The invention relates to a normal incidence correcting method for satellite images. The normal incidence correcting method comprises the steps that a normal incidence correcting transformation range is delimited; DEM data in the transformation range are obtained and converted under a geographic coordinate system; RPC coefficients of the satellite images to be corrected are obtained, and peak pixel object space coordinates of the images are estimated through an RPC model; DEM data corresponding to the images are extracted; the DEM data are used for recalculating the peak pixel object space coordinates through the RPC model; a projection transformation relation between a geographic coordinate system and a target plane coordinate system is established; a corresponding relation between the target plane coordinate system and the image space coordinate system of the satellite images to be corrected is established. By means of the normal incidence correcting method for the satellite images, middle reading and writing can be reduced, the calculation speed of normal incidence correcting can be increased, the pressure of a hardware storage space can be reduced, hardware losses can be reduced, the change of a calculation area range can be met, the engineering application requirement can be met, and normal incidence corrected products of the satellite images under the plane coordinate reference can be output.

The invention discloses an expansive soil conditioner, which is solution prepared by polyvinyl alcohol and saturated limewater according to a certain weight ratio; and the preparation method comprises the following steps: taking the polyvinyl alcohol and the saturated limewater according to the certain weight ratio, doping an appropriate amount of anhydrous ethanol, heating the mixture in a water bath, fully stirring, dissolving the polyvinyl alcohol in the limewater, placing in the water bath for a certain time, and taking supernatant liquid which is used as the conditioner of the saturated limewater solution of the polyvinyl alcohol; and spraying the conditioner on the surface of dry expansive soil, carrying out the second spraying of the conditioner after the surface of the expansive soil is dry and carrying out a plurality of times of spraying of the conditioner in such way, thereby forming a surface conditioning layer with a certain thickness and eliminating or reducing expansion and contraction properties of a coil body in the conditioning layer; and the test result shows that the free expansion ratio of the expansive soil which is taken out from 90cm to the soil surface is reduced from the original 50 to 27 through the free expansion test, thereby meeting the requirement of engineering construction.

The invention provides a preparing method of a high impact toughness TA24 alloy board. The problem that in the prior art, a TA24 alloy board is insufficient in impact toughness is solved. According tothe preparing method, through an ingot casting smelting link, the board forging link, the rolling link, the heat treatment link and the surface treatment link, the finished product board is obtained.According to the board forging link, an ingot casting to be used is subject to single-phase-area forging with at least one heating number at the temperature of 1050 to 1150 DEG C, substituting forging is carried out within the temperature range being Tbeata-60 DEG C to Tbeata-20 DEG C, a large casting structure in the square board can be sufficiently broken, and the obtained TA24 alloy board is uniform in structure, has the high impact toughness, and strong plasticity and matching, and meets the ship engineering applying needs.

The invention discloses a fully intelligent anti-scaling and descaling alloy, which comprises the following components by weight percentage: Cu: 40%-70%, Ni: 5%-20%, Zn: 8%-35%, Sn: 5% ‑30%, Ag: 0.5%‑20%, Fe: 0.1%‑8%, Nb: 0.01%‑3%, Mn: 0.05%‑5%, V: 0.01%‑2%, C: 0.01%‑0.5 %, the components are smelted at high temperature to form a columnar crystal alloy that grows oriented along the S110 crystal axis. The activation current of the invention is about 80 μA, and the stabilization time is about 150 minutes, which not only fully meets the engineering application requirements of scale inhibitors, but also increases the activation current by about 60% compared with the existing copper-based catalyst products, and the composition is more reasonable and safe, and the processing cost is also lower. Low.

The invention discloses a power grid inherent structural characteristic-based power distribution network optimal reactive compensation method. The method includes the following steps that: a subsystem is divided with reactive power compensation nodes adopted as decomposition points according to local reactive power balancing principles, and reactive power compensation capacity is determined in the subsystem based on inherent structural characteristics of a power grid, and therefore, optimal compensation of the operation of a system can be determined; with the reactive power compensation capacity limited, a heuristic type push-back algorithm is adopted to perform correction and compensation according to a situation whether the sum of node types of the system is vacant; and load flow is calculated, and according to the calculated load flow or current load flow measurement, and based on a characteristic that structural adjustment of the power rid is carried out so as to adapt to the source flow of the system, simplification is performed, and full-grid reactive power compensation optimization with minimum grid loss as a goal can be realized, and a solution space is traversed, so that a compensation scheme can be determined. The power grid inherent structural characteristic-based power distribution network optimal reactive compensation method of the invention can be applied to distribution network capacitor fast optimal decision making, and play an important role in power distribution network optimal reactive power compensation, and provide technical support for intelligent development of the power distribution system.

The invention discloses a simplified analysis method for an inherent frequency and the stability of a rotational symmetric structure. The method comprises the steps of establishing a complete dynamic differential equation of a system, a dynamic differential equation adopting a no-extension hypothesis, and a dynamic differential equation adopting an extension hypothesis: establishing the complete dynamic differential equation of the system; establishing the dynamic differential equation adopting the no-extension hypothesis; establishing the dynamic differential equation adopting the extension hypothesis; introducing coordinate conversion for converting the three dynamic differential equations to a support follow-up coordinate system so as to obtain corresponding three constant coefficient partial differential dynamic equations; performing discrete processing on the three constant coefficient partial differential dynamic equations in the support follow-up coordinate system to obtain three constant differential matrix equations; obtaining an eigenvalue of the complete dynamic differential equation and eigenvalues of two simplified dynamic differential equations; and analyzing a parametrically excited vibration mode characteristic and a dynamic stability change law of the rotational symmetric structure according to the three eigenvalues. According to the method, a specific analysis expression of system eigenvalues can be obtained more clearly.

The invention provides a Weibull unit spare part demand quantity calculation method under a storage failure risk. The method comprises the three steps of initialization, security probability calculation and judging. Calculation is accurate, the error is small, calculation is rapid and convenient, the result is close to an analogue simulation result of the executive condition of a traditionally adopted security task, and the engineering application requirements are met.

The invention relates to an integral impact response analyzing method for a suspension tunnel. The integral impact response analyzing method is used for calculating the integral displacement and internal force response of the suspension tunnel under the impact load in a way of considering the non-linear fluid effect, and comprises the following concrete steps that a suspension tunnel pipe body simplifying model is built; the impact load and fluid effect are determined; a pipe body power control equation is built; the structural integral motive power response is solved. The integral impact response analyzing method has the advantage that the calculation of the integral displacement and internal force response of the suspension tunnel under the effect of any impact load and under the condition of considering the fluid non-linear effect can be realized.

The invention discloses an expansive soil modifier, which is solution prepared by polyvinyl alcohol and water according to a certain weight ratio; and the preparation method comprises the following steps: taking the polyvinyl alcohol and the water according to the certain weight ratio, doping an appropriate amount of anhydrous ethanol, heating the mixture in a water bath, fully stirring, dissolving the polyvinyl alcohol in the water, placing for a certain time in the water bath, taking supernatant liquor, and obtaining saturated water solution of the polyvinyl alcohol as the modifier. The modifier is sprayed on the surface of dry expansive soil, the second spraying of the modifier is carried out after the surface of the expansive soil is dry, after a plurality of times of spraying of the modifier, a surface modification layer with a certain thickness can be formed, thereby eliminating or reducing the expansion-shrinkage property of a soil body in the modification layer; and the test result shows that the free expansion rate of the expansive soil which is taken out from 90cm to the soil surface is reduced from the original 50 to 37 through the free expansion test, thereby meeting the requirements of engineering construction.

The invention discloses a method and system suitable for recognizing connecting joint surface parameters. The test system for recognizing the parameters can test various features of joint surfaces of mechanical structures, and is wide in coverage range, wherein the joint surfaces include fixed joint surfaces (such as welded surfaces), movable joint surfaces (in threaded connection) and relative movement joint surfaces (such as sliding and rotating). According to the method and system suitable for recognizing connecting joint surface parameters, the relations between all connected visco-elastic units and the dynamic continuity of the connected visco-elastic units are considered, the mechanical properties and physical properties such as the dimensions of joint surfaces are considered, the operation of monitoring sensor arrangement points replaces deformation of joint surface points, and measurement is accurate; finally, a multi-scale and multi-level testing structure and correcting method are adopted, and then the calculation efficiency and the monitoring precision can meet the engineering application requirements.

The invention discloses an electrolyzed water reaction device with an externally applied magnetic field and a method for improving electrocatalytic properties and belongs to the new energy technical fields of electrolyzed water catalysis and electrolyzed water hydrogen preparation. A base is arranged below an electrolytic tank; the base is provided with a permanent magnet base A, a permanent magnet base B, a supporting disk and a rotating disk; and the movement of the permanent magnet base B is controlled by a screw placed in the base, and meanwhile, the rotating disk is rotated to regulate anincluded angle of a working electrode in the electrolytic tank arranged on the rotating disk and the magnetic field, so that the direction of the magnetic field is controlled; in addition, the electrocatalytic properties are represented by measuring the overpotential and tafel slope of an oxygen and hydrogen evolution reaction of electrolyzed water by an electrochemical workstation. By using theelectrolyzed water reaction device, the catalytic properties of a catalyst in a water electrolysis process is improved by utilizing the externally applied magnetic field, meanwhile, complex material preparation processes such as structural regulation and control, morphological construction and interfacial optimization are avoided, and the aims of effectively saving energy and stably working for along time are achieved.

The invention discloses a new ejection delivery speed measurement method for an ejection seat, and belongs to the technical field of aviation ejection life-saving. According to movement characteristics of the ejection seat, based on a computer simulation method, a mapping relation model of body axis x-direction acceleration value and ejection velocity of the ejection seat based on a BP neural network is established in advance; a body axis x-direction acceleration sensor is mounted in an appropriate position of the ejection seat, and the body axis x-direction acceleration value of the ejectionseat at that moment of delivery is measured; and the corresponding ejection delivery speed is calculated on the basis of the acceleration value according to the mapping relation model which is established in advance. According to the method, the probability of inaccurate measurement caused by blockage of an airspeed head and influence of an external flow field is avoided, slight errors are produced, and engineering application requirements are met.

The invention relates to a method for inhibiting an induction voltage and an induction current of a 750kV parallel single-line construction line. Two large-distance parallel and single-line construction 750kV alternating current transmission lines are coupled on an off-the-line line to generate a higher induction voltage and a higher induction current to ensure that the problem of difficult equipment selection caused by exceeding the turning on or off capacity of the existing 750kV earthing switch is solved. The invention provides a transposition and phase sequence arrangement mode to ensure that levels of the induction voltage and the induction current applying the measure are remarkably reduced and are lower than the requirement on technical parameters of the existing equipment, and thus the equipment selection problem is solved.

The invention discloses a flue gas purifying device for a fixed-bed, which is filled with activated carbon fiber. The top part of a shell of the device is provided with an exhaust inlet and the bottompart is provided with an air outlet; the inner cavity of the shell is divided into a diversion section, a purification section and an air collection section from top to bottom; the diversion sectionis provided with a plate rectifier with holes and a diversion plate is arranged on the plate rectifier; and the purification section is provided with an activated carbon fiber filling cell. The upperend and the lower end of a fixed frame of the activated carbon fiber filling cell are provided with two parallel comb plates respectively; upper clamping plates and lower clamping plates are respectively inserted in various comb openings of the upper comb plate and the lower comb plate; sheet-shaped activated carbon fibers are fixed between the upper clamping plates and between the lower clampingplates; and the width of the spacing between the adjacent two activated carbon fibers is between 0.5 mm and 10 mm. In the invention, the activated carbon fiber can be tightly, reliably and fixedly installed in the purifying device for a long time. The device has the advantages of compact structure, high filling efficient of activated carbon fiber, low consumption of a reactor, convenient repair, installation, replacement and reproduction and the like.

The invention relates to a high-performance low-carbon microalloy steel SEW (hot stretch-reducing electric welding) expansion casing and a manufacturing method thereof. The expansion casing comprises the following chemical components in percentage by mass: 0.10-0.25% of C, 0.12-0.30% of Si, 0.60-1.50% of Mn, no more than 0.010% of P, no more than 0.005% of S, 0.05-0.5% of Nb+V+Ti and the balance of Fe and inevitable impurity. The manufacturing method comprises the following steps: (1) performing FFX molding and HFW welding on a high dimensional precision controlled low-carbon microalloy steel TMCP hot rolled coil to manufacture an HFW welded tube; (2) quickly heating the HFW welded tube to 900-1100 DEG C in an intermediate-frequency induction heating mode, then performing hot mechanical rolling and hot stretch reducing to obtain a tube blank having a required size, and optimizing a welding seam structure to ensure that the welding seam structure is almost the consistent with the base material, thus realizing physical seamless treatment; (3) performing overall special heat treatment on the whole tube blank subjected to hot rolling and reducing, thus ensuring that the whole tube is consistent in structure and property; and (4) performing hot straightening, nondestructive flaw detection and in-tube sandblast derusting treatment, machining tube end screw threads, and inspecting, thus finally forming the expansion casing.

The invention relates to an acidic coating super duplex stainless steel welding rod and belongs to welding material technology. The invention adopts 2507 duplex stainless steel wires as the welding core; the components and the weight percentages of the components of the welding rod coating are as follows: 30-40 of rutile, 3-7 of titanium dioxide, 15-20 of potash feldspar, 1-3 of phlogopite, 5-10 of marble, 16-20 of metal powder, 0.5-1.5 of rare earth fluoride, 2-3 of cryolite, 5-8 of chrome green, 0.5-1.0 of soda, and 1.5-3.5 of ferroalloy. The welding rod of the invention has the advantages, showed by the test results of manufacturability, metallographic observation, mechanical property and corrosion resistance, that the welding rod has extremely good welding technical property; electric arc is stable during welding, and spattering does not basically exist; the formation of weld joints is good; slag detachability is good; the manipulability of the welding rod is excellent; through metallographic observation, the content of ferrite in the structure of welding joints ranges from 40 percent to 60 percent, and the phase ratio can meet engineering application requirement; the weldedwelding joint has excellent mechanical property, and tensile strength can be more than 800 MPa; low temperature toughness is good; the stress corrosion resistance and pitting corrosion resistance of the welding joint are excellent.

The invention discloses a compound traveling wave thermal acoustic motor driven by double ports. It includes a traveling wave loop structure thermal acoustic generator made up of feedback channel, acoustic capacitance channel, ejector pump, a primary cooler, a thermal acoustic regenerator, heater, thermal buffer channel, and a supplementary cooler and resonance straight-path, the another end of the resonance straight-path is connected to the thermal acoustic generator with the same or similar traveling wave loop structure. The invention increase the acoustic power output of the thermal acoustic motor and upgrade the efficiency of the motor, it provides the concept using double port to drive compound traveling wave thermal acoustic motor, the two loop thermal acoustic generators outputs heating power at the same time or singly, thus there has more acoustic power transmitted to the resonance straight-path, the whole system has merits of the pure standing wave motor and pure traveling wave motor. It realizes the running mode of traveling wave, and it has a thermal acoustic conversion power high than the single port type.

The invention provides an anti-cracking soil stabilizer. The anti-cracking soil stabilizer is prepared from slag powder, desulfurized gypsum, beta-hemihydrate gypsum, coal ash, construction waste powder, sylvite or ammonium salt and an excitant. According to the anti-cracking soil stabilizer and the using method, after 10% of the stabilizer is added into target soil and then the soil is doped, thecompressive strength (unconfined compressive strength) of the stabilized soil can be high and can reach 6 MPa (national standard is 0.9 MPa) in 7 days, and the engineering application requirements inthe aspects of road base layer laying, site hardening and the like can be met; and cement is not required to be added, soil cracks can be prevented, and the method is an environment-friendly and low-cost solidification technology.

The invention provides a method for calculating the loss number of exponential unit spare parts, which comprises an initialization step, a cyclic calculation step and a result output step, is accuratein calculation, small in error and rapid and convenient in calculation, is close to a traditional simulation result of a spare part guarantee process with storage failure risks, and meets the engineering application requirements.