266results about How to "Meet engineering requirements" patented technology

The invention discloses an adjustable bending sheath tube, which comprises a tube body, a traction fiber and a handle. The traction fiber can slide in the tube body and the handle, the tube body has a near end and a far end, the near end is connected with the handle, the handle comprises a branch which is arranged on one side near the near end of the tube body, a movable part which can transversely move along the branch is mounted on the branch, a near end of the traction fiber is fixed on the movable part, a far end of the traction fiber is fixed on the far end of the tube body, an elastic section is positioned near the far end of the tube body, the bending angle of the elastic section is changed when the movable part moves transversely on the branch, and the movable part is threaded with the branch. Compared with bending sheath tubes in prior art, the bending sheath tube is capable of shortening the effective lengthen of the handle and improving the accuracy of the angle controlling, and the operating process is enabled to be convenient and easy to control.

The invention relates to a multi-functional multi-specimen sealing gasket service life evaluation testing apparatus which comprises a gasket loading and load measuring system (56) and a medium given system (51). The apparatus is characterized in that the air given end of the medium given system (51) is connected with the air inlet end of a medium sealing system (53), the medium sealing system (53) is positioned inside of a temperature controlling and measuring system (54), a cooling thermal insulation system (57) is placed above the medium sealing system (53), and a leakage rate measuring system (55) is positioned on one side of the temperature controlling and measuring system (54); the medium sealing system (53), the temperature controlling and measuring system (54) and the cooling thermal insulation system (57) are connected respectively through stress bolts (14) of the gasket loading and load measuring system (56); and a data acquisition and control system (52) is respectively and electrically connected with the medium given system (51), the medium sealing system (53), the temperature controlling and measuring system (54), the leakage rate measuring system (55) and the cooling thermal insulation system (57).

The chemical constituent (weight percentage) of the copper alloy material includes Te 0.1-1.2, Mg 0.2-1.3, Li 0.02-0.50 and Cu as the rest as well as unavoidable impurities. According to specification needed, the contact line of conducting wire is made through the procedures of getting conventional materials ready, mixture making, melting, casting ingot as well as cold working and hot working. Its copper alloy possesses the properties of tensile strength as 523-576 MPa, resistivity as 0.022695-0.023764 ohm mm2 / m, recrystallization temperature as 390-410 deg.C. The invented alloy provides the capability of anti electric arc equivalent to the alloy of 0.3Ag-Cu but with lower cost than the 0.3 Ag-Cu alloy about 10-20%.

The invention discloses a spiral bevel gear surface contact analysis method. The method includes: taking a large gear as an imaginary generating gear tool to generate a small gear datum tooth surface;according to small wheel processing parameters and a linear cutting edge starting position, determining a boundary between an operating tooth surface and a transition curved surface, working out minimum and maximum processing corners of the large gear in an operating tooth surface range, and further calculating coordinates of the small gear datum tooth surface and a small gear tooth surface on aninstantaneous contact line correspondingly to obtain a gap between the two tooth surfaces; taking a minimum gap point on the instantaneous contact line as a contact point to obtain an approximate contact trace line, wherein the contact point is an effective contact point when the gap is smaller than 0.00635mm; converting all contact point minimum gaps into angular units to obtain an approximate transmission error. According to different geometrical conditions, two conditions namely edge contact and normal contact are included. Results of the approximate method are quite close to those of traditional theoretical methods, and engineering requirements can be met.

The invention discloses a nondestructive test and evaluation method of a metal member / material residual life. The method comprises steps of: acquiring a relation curve between a metal member / material residual life and an ultrasonic second harmonic normalized value; carrying out ultrasonic second harmonic signal measurement on a metal member / material to be measured and obtaining a residual life score corresponding to the measured second harmonic normalized value according to the relation curve; predicting a residual life of the metal member / material to be measured according to the residual life score and a loading time of the metal member / material to be measured. The nondestructive test and evaluation method of the metal member / material residual life of the invention can carry out detection and evaluation on creep deformation damage of a working metal member / material part, rapidly and effectively predict the residual life of the working part and provide basis for safe service of the metal member / material.

The invention belongs to the field of sea surface wind direction inversion through a remote sensing means, and particularly relates to a navigation radar image sea surface wind direction inversion method based on a wave number energy spectrum. The method comprises the steps of preprocessing a radar image, extracting sea surface static characteristics and inverting sea surface wind direction information. According to the navigation radar image sea surface wind direction inversion method based on the wave number energy spectrum, a space domain does not need to be reduced, the space domain can automatically adapt to wind stripes of different scales, the wind direction can be measured under different sea conditions, an error result is stable, and engineering availability is high. According to the navigation radar image sea surface wind direction inversion method based on the wave number energy spectrum, only the wind stripe energy spectrum is extracted through wave number energy spectrum wave number scale separation, the wind direction inversion precision is improved, and the interference of the noise of other scales is reduced.

The invention discloses a method for combined measurement of permeability and porosity of a dense rock under dynamic confining pressure. A device for realizing the method comprises a confining pressure control device, a rock core pressure chamber, a downstream air cylinder, an upstream air cylinder, a pressure loading device, an upstream air pressure recorder, a downstream air pressure recorder, an upstream-downstream air pressure difference recorder and a computer. According to the method for the combined measurement of permeability and porosity of the dense rock under dynamic confining pressure provided by the invention, few physical quantities need to be measured, the operation is easy, and dynamic measurement of permeability and porosity under complex stress is realized. In addition, the method has the advantages that the measurement time is short and the accuracy is high for dense rocks with a permeability less than 10 to 17m<2> and a porosity less than 1.5%, and can automatically record the test data; the test result is accurate; the test efficiency is improved; and test data under different pressures are obtained to calculate the permeability and porosity at one time.

The invention relates to a method for preparing combined supporting frame of nanometer hydroxyapatite and silk fibroin-chitosan, belonging to field of tissue organizing technology. It is to solve problems of damage of biological activity of material by introduced organic dissolvent, small porous size and low porous rate inside material, bad porous connectivity and unfavorable for reproduction of bone cell in current preparation method. The material in this invention comprises inorganic and organic material, inorganic material is nanometer hydroxyapatite, and organic material is silk fibroin and chitosan. The ratio by weight between inorganic and organic material is 50-70:30-50, the ratio between silk fibroin and chitosan by weight is 1:1-2.The said supporting frame is prepared by freezing and drying method. The cell frame porous rate is 75%-90%, the pore size is 150-500 um, and compression strength is 0.85-1.85 Mpa.

The invention relates to the field of drilling bored concrete pile construction, in particular to a construction method for jointing of steel reinforcement cages of a reinforced concrete drilling bored concrete pile. The construction method solves the problems of unwarranted joint quality, complicated jointing operation, time and energy waste, low construction speed and the like of conventional steel reinforcement cage jointing. The construction method comprises the following steps of: 1) performing rolling and straight thread processing on bar ends of the steel reinforcement cage; 2) manufacturing the steel reinforcement cage in a segmented way by using a steel reinforcement cage bar joint jointing precision control device; and 3) positioning the lower segment of the steel reinforcement cage in a hole, adjusting the levelness of a lower joint end face first, hoisting the upper segment of the steel reinforcement cage in place, adjusting the verticality, aligning all main bars of the upper and lower segments of the steel reinforcement cages in positions and pressing against the ends next, and screwing sleeves of the main bar ends of the upper segment of the steel reinforcement cage downwards on the main bar ends of the lower segment of the steel reinforcement cage at last to realize the jointing of the upper and lower steel reinforcement cages. The construction method guarantees the bar joint quality, has high steel reinforcement cage joint performance and high construction speed, reduces piling time, saves cost on machine team and the like and shortens the construction period.

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

The invention discloses a predicting method of an aluminum alloy die pressed casting grain size based on a GA-ELM algorithm. The predicting method comprises the first step of using the new algorithm GA-ELM which combines a genetic algorithm GA and an extreme learning machine ELM; the second step of using the GA-ELM algorithm to predict the grain size with high efficiency, high precision and low cost; directly inputting a technological parameter which needs to be predicted into a trained GA-ELM model through a user, and obtaining a corresponding predicted value of the grain size after calculation. According to the predicting method of the aluminum alloy die pressed casting grain size, the GA-ELM model is the combination of the genetic algorithm and the extreme learning machine, the GA is adopted to conduct optimization on a weight matrix of an input layer and a threshold value matrix of a hidden layer of the ELM, the influence of randomness of the weight matrix of the input layer and the threshold value matrix of the hidden layer on the predicting accuracy of the ELM is avoided, the predicting accuracy and the predicting efficiency are improved, and the cost is sharply reduced; in addition, a model base of the predicting method of the aluminum alloy die pressed casting grain size can be enriched.

The invention provides a dragline curtain wall support system with a steel truss at the top and a construction method thereof. The dragline curtain wall support system comprises main building structures at two sides, a support structure at the lower part, the steel truss at the top and a curtain wall steel cable at the middle, wherein the main building structures provide left and right fixed points of the steel cable, and the steel truss and the support structure at the lower part provide upper and lower fixed points of the curtain wall steel cable; a two-direction fixed mode of horizontal connection and vertical connection is adopted at the two ends of the steel truss and between the main building structures; and the horizontal connection is realized through a horizontal bearing support, and the vertical connection is realized through a vertical bearing support. The dragline curtain wall support system is simple in structure and convenient in construction; by virtue of the two-direction support fixed mode, the structure strength is increased, the node structure is simplified, and the structure safety is greatly increased; The horizontal bearing support is installed after vertical steel cable prestress tension to enable the steel truss to freely rotate under the action of the vertical force, so that the secondary stress of buildings at two sides is reduced; and by transferring force by a horizontal steel plate, the bearing force is large, the stress is reliable, and micro-vertical deformation of the steel truss can also be applicable.

The invention discloses a slave end controller of an interventional operation assisting system with catheter-guide wire conducting collaborative operation and belongs to the technical field of medical equipment.The slave end controller comprises a guide wire, a guide wire operator, a catheter, a catheter operator, a sliding bracket, an axial movement controller and a shell; the guide wire operator is used for conducting rotating, clamping and relaxing operation on the guide wire used for the operation; the catheter operator is used for conducting rotating, clamping and relaxing operation on the catheter used for the operation; the sliding bracket is used for supporting the guide wire and the catheter and limiting the movement locus of the guide wire before entering the catheter so as to prevent the guide wire from being bent before entering the catheter; the axial movement controller is used for controlling axial movement of the catheter and the guide wire; the shell is used for supporting the guide wire operator, the catheter operator and the sliding bracket.According to the slave end controller, interventional actions are completed according to operation information of doctors, real-time haptical information can be fed back to the doctor visually, and safety and operability of the interventional operation can be improved.

The invention provides an oil-well cement additive for preventing corrosion of hydrogen sulfide as well as a preparation method and an application thereof, belonging to the field of oil-well cement well cementation. The oil-well cement additive mainly comprises the following components in percent by weight: 20-75% of volcano cinerea mineral, 2-35% of silica powder, 5-30% of aluminum salt mineral,2-35% of pitch organic material, 1-10% of gangue, and the like. By adding 15-60 parts of the oil-well cement additive in the well cementation cement slurry system with 100 parts of cement, the invention can enhance the tightness of a cement loop pillar, has low gas permeability and strong ability for resisting the corrosion of hydrogen sulfide, is suitable for different temperatures in the bad well cementation environment and has wider application range.

The invention discloses a three-dimensional reference line-based BIM creation method for a building. The method comprises the following steps of S1, generating a spatial three-dimensional line based on planar and longitudinal section data of a line; S2, extracting the position of a building plane center, and generating a discontinuous three-dimensional building model according to a relationship between the position and the spatial three-dimensional line; S3, establishing a local coordinate system corresponding to a mileage point of the line, drawing a corresponding structure outline according to the local coordinate system, and performing sweeping and lofting on the structure outline based on the spatial three-dimensional line to generate a continuous three-dimensional building model; and S4, generating a complete BIM of the building. According to the method, the BIM of the building is created; three-dimensional visual design of building layout is realized; the generated model is visual and vivid, and the model is extremely convenient to update and modify, so that the engineering efficiency can be improved; and in addition, the generated model establishes a building full-life-cycle database, so that more bases are provided for later operation and maintenance.

The invention relates to a rapid damage positioning scheme for an internal geomembrane in anti-seepage engineering, belonging to the technical field of hydraulic engineering (civil engineering)- anti-seepage engineering. The method comprises the following steps of: combining continuous optical fibers and the geomembrane into a whole, wherein the optical fibers are uniformly arranged in a snakelike shape on the geomembrane, and the distance between the optical fibers is not greater than the temperature-sensitive distance of double optical fibers; using the geomembrane as an anti-seepage material and making the optical fiber path of the whole anti-seepage area through; leading out the endpoints of the optical fibers to an optical fiber temperature-measurement detection device and covering aprotective layer of the geomembrane; and establishing a conversion formula between the XY coordinate values of optical fiber length L and an anti-seepage face according to the arrangement design of the anti-seepage engineering, monitoring the temperature of each position of the geomembrane by adopting the optical fiber temperature-measurement detection device, judging the area with abnormal temperature comparison to be a seeping position and judging the position with highest temperature abnormality to be the central position of the geomembrane damage. The method solves the problem of difficult damage positioning of the geomembrane and can obviously improve the safety of a dam using the geomembrane as an anti-seepage body.

A vascular interventional operation robot main end force feedback device is characterized by comprising a cylindrical magnetic conduction stick, an operation rod, a catheter, a connection buckle internally comprising a bearing, a solid optical-electricity encoder, a hollow optical-electricity encoder, a coil, a spool, a guide rail and a magnet; the working method includes the steps that when the rotating angle is measured, the rotating angle can be measured by rotating the catheter to drive an inner shaft of the hollow optical-electricity encoder to rotate; when axial movement information is ensured, a solid shaft of the solid optical-electricity encoder rotates together with an operation rod through the guide rail so that advancing displacement can be converted into the rotating angle; force feedback of the operation force of a slave operator is achieved on a master operator. The vascular interventional operation robot main end force feedback device has the advantages that the design lays emphasis on real-time feedback of the operation force of operations, the operation force of the slave operator can be directly fed back to the operation hand of a doctor in real time through an operation pipe on the main operator, feedback is visible, and requirements for operation safety and doctor operation are met; the axial information of operation of the doctor is efficiently obtained in an electromagnetic induction mode without adding additional loads.

The invention relates to the technical field of retaining walls of soil filling slopes, and discloses a semi-assembly type retaining wall of a soil filling slope. The semi-assembly type retaining wall of the soil filling slope comprises a plurality of reinforced concrete piles, pile top tie beams and upright columns, wherein the pile top tie beams are arranged at the upper ends of the reinforced concrete piles; intercolumnar tie beams are arranged in the middles of the upright columns; an intercolumnar gap is formed between each two adjacent upright columns; a balancing beam is arranged on the back side of each upright column; an inter-beam gap is formed between each two adjacent balancing beams; a retaining vertical plate is inserted in each intercolumnar gap; and a balancing flat plate is paved in each inter-beam gap. The retaining wall is provided with the reinforced concrete piles, and is well-adapted to geological conditions; balancing beam and slab structures are arranged on the back sides of the upright columns, so that the stress of the whole retaining wall is reasonable, the construction cost for the retaining wall is saved, and the applicable height of the retaining wall is increased; and moreover, the retaining wall has a semi-assembly structure, the curing period of pouring baffles is avoided, the construction speed is increased, and anchor cables are not required in the retaining wall, so that potential safety hazards caused by the reason that the anchor cables are easy to corrode and poor in durability are avoided.

The invention provides a trajectory prediction system and method, electronic equipment and a readable storage medium, and the method comprises the steps: obtaining the historical position of an automatic vehicle in a world coordinate system, the historical relative position of a to-be-predicted object relative to the automatic vehicle, and the environment information of the to-be-predicted object, based on the historical position of the automatic vehicle in the world coordinate system, the historical relative position of the to-be-predicted object relative to the automatic vehicle and the environment information of the to-be-predicted object, obtaining the historical positions of the to-be-predicted object and surrounding obstacles in the world coordinate system; according to the historical positions of the to-be-predicted object and the surrounding obstacles in the world coordinate system, obtaining and semantically extracting the relative historical trajectory of the to-be-predicted object based on the historical relative positions of the to-be-predicted object relative to the surrounding obstacles, and combining the relative historical trajectory with the lane information subjected to semantic extraction to obtain a semantic historical trajectory; and inputting the semantic historical trajectory into the trajectory prediction model to perform trajectory prediction of the to-be-predicted object. According to the method, the unmanned driving computing power is greatly improved, the computing consumption in the unmanned driving operation is minimized, the prediction precision can be ensured, and the engineering requirements are better met.

The invention relates to a method for simulating noise radiation and decomposing noise sources when an automobile speeds up, which is characterized in that: individual noise characteristics are measured by performing a bench test on a structure and an engine, the engine and a gearbox, a cooling fan, a muffler, an exhaust port, an inlet port, tires and a rear axle of a vehicle. The method comprises the following specific steps: (1) establishing an acoustical model of an assembly individual; (2) establishing a motion equation of the vehicle in an accelerating outside noise test based on an incoming speed, an outgoing speed and a length of the vehicle regulated by an accelerating outside noise measurement method; (3) when the vehicle is at an x position, measuring predicted sound pressure at a microphone by using a formula; and (4) predicting a sound pressure level of maximum accelerating outside noise. The accelerating outside noise is simulated, predicted, and compared with an outfield measurement and an anechoic chamber through a noise simulation test; and a deviation between a simulation calculation and a measured result is within 2dB (A) so as to meets project requirements.

The invention discloses an oil well cement additive used for preventing H2S / CO2 co-corrosion, and a preparation method and an application thereof. The oil well cement additive comprises 100 parts of fly ash, 20-40 parts of slag, 6-10 parts of sodium methylsiliconate, 10-30 parts of organic material asphalt, 10-30 parts of micro silica powder, and 10-40 parts of ultrafine alumina. Calculated according to the weight of cement as 100 parts, 30-65 parts of the oil well cement additive used for preventing H2S / CO2 co-corrosion is added. With the additive, cement stone compactness is improved. Cement stone gas permeability is low, and hydrogen sulfide and carbon dioxide co-corrosion resistance is high. The additive can be applied in different temperatures, and an application range is wide.

This invention relates to a polycarboxylic acid and use thereof in cement. The polycarboxylic acid has a comb-shaped structure and is formed through random copolymerization of a first monomer A, an unsaturated carboxylic acid monomer B and a functional monomer C, wherein the first monomer is selected from at least one of unsaturated polyether monomers and unsaturated polyester monomers, and the molar ratio of each polymer is A:B:C = 1:(8-50):(0-5). The polycarboxylic acid used as a dispersing agent can greatly extend and effectively control retention of cement collapsbillity and fluidity underthe condition of without addition of retarders, and does not bleed water, thereby meeting engineering requirements.

The invention provides an additive for well cementing cement mortar and preparation and application methods thereof, relating to the field of well cementation with oil well cement. The additive for oil well cement is mainly prepared by uniformly mixing 35 to 65 wt% of modified resin, 3 to 35 wt% of calcium carbonate, 5 to 25 wt% of active silica, 2 to 15 wt% of alkylsilane and the like. When the additive is added into a well cementing cement mortar system according to a weight ratio of cement to the additive of 100: 2-10, the additive promotes self-healing of cracks or micro-annulus of a cement sheath caused by various factors when the well cementing cement mortar system comes across water, compressive strength of the cement sheath is improved, and permeability of the cement sheath is reduced. Set cement with the additive has expansibility, cementation strength of a well cementing interface and zone isolation capacity of a cement sheath column are both improved, and the set cement is applicable to different temperatures in well cementation environments with severe properties.

The invention discloses a novel flexible coast protection structure and a construction method of the novel flexible coast protection structure. The structure comprises a mattress tying beam and a wave dissipating platform, wherein the mattress tying beam and the wave dissipating platform are close to the designed water level; the wave dissipating platform is connected with the bottom and the top of a bank slope through a slope and a wave wall respectively; a pebble cushion layer and composite geotextiles are sequentially laid on the lower surface of the slope and the lower surface of the wave dissipating platform. Composite geotextiles and a gravel cushion layer are sequentially laid on the upper surface of the slope and the upper surface of the bottom of the bank slope. A concrete hinged mattress is laid on the gravel cushion layer. The top end of the hinged mattress is connected to the mattress tying beam. The method comprises the steps of prefabrication of concrete ballast block bodies, construction of the mattress tying beam and a bank protection structure above the mattress tying beam, splicing of the concrete hinged mattress, mattress sinking construction and the like. Compared with the existing coast protection technology, the novel flexible coast protection structure has the advantages that the integrity is good, the anti-erosion capability and the coastal erosion deformation adaptability are high, materials are easy to obtain, construction is easy, and maintenance management is convenient; the problem that a traditional rigid seawall bank protector is prone to collapse and damage on the condition of coastal washout deformation can be effectively solved, and a new approach is provided for coast protection.

The invention relates to a spraying method of a secondary solution for improving expansive soil. The spraying method is characterized by comprising the following steps of: (1) dissolving water glass with the mass m1 into water with the mass mw1 to prepare water glass solution, uniformly spraying the water glass solution into dry expansive soil with mass ms, mixing uniformly, standing for 2-12h for later use; and (2) dissolving aluminum sulfate powder with mass m2 into water with mass mw2 to prepare an aluminum sulfate solution, uniformly spraying the aluminum sulfate solution in a standby soil sample obtained in the step (1), mixing uniformly, standing for over 2h, and carrying out compaction treatment when the moisture content is reduced to the optimal moisture content. Compared with the traditional method for improving lime or cement and the like, the spraying method is simple in process and remarkable in effect and meets the requirement for environment friendliness.

The invention discloses an ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna, and mainly solves the problems of wide frequency band, omnidirectional horizontal polarization and miniaturization of an antenna cannot be satisfied in the prior art. The ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna comprises a radiation unit (1), a feeding network (2) and a dielectric plate (3), wherein the radiation unit (1) is a 16-element connecting type Vivaldi antenna array which is formed by a Vivaldi unit around a center in a rotating manner; the feeding network (2) adopts a one-into-sixteen broadband Wilkinson power divider and a coupling microstrip feeder line; electromagnetic energy is coupled to the radiation unit through the coupling microstrip feeder line; the dielectric plate (3) adopts a Kangtaini (a Chinese brand name)dielectric plate with a dielectric constant of 2.55; the radiation unit and the feeding network are printed on the upper and lower surfaces of the dielectric plate; and the centers of the radiation unit and the feeding network coincide with that of the dielectric plate. The circular array antenna has the characteristics of ultra wide band, omnidirectional horizontal polarization and miniaturization, and can be used in a full-coverage ultra-wide-band wireless communication system in the peripheral regions.

The invention provides a symmetric turnout for line rails No.4 and No.5 in urban rail traffic engineering. The turnout is arranged on a parking line rail of an underground line in an urban rail engineering, the structure of the symmetric turnout comprises a group of railroad switches, a group of frogs and a connecting steel rail, wherein the railroad switches are connected with the frogs by virtue of the connecting steel rail so as to form a symmetric turnout provided with two side rails. The symmetric turnout provided by the invention has the beneficial effects that the turnout ensures a subway and a light rail vehicle to travel safely between a main line and a parking line, related technical standards and safety requirements of the urban rail engineering are met, and the advantages of safety, reliability and convenience in manufacturing, paving, construction and maintenance are realized. By applying the symmetric turnout provided by the invention, turnout investment can be saved, and length of an auxiliary line can be obviously shortened, thus investment of a building project is greatly saved, construction difficulty is reduced, and project risk is reduced.

The invention discloses a method for constructing a collaborative awareness system on the basis of development objects of complex products. The method particularly includes steps of firstly, selectively using a B / S network structure, namely a Browser / Server network structure, as a system architecture; secondly, analyzing elements relevant to a complex product development procedure and relations of the elements and creating a database table; thirdly, searching collaborative awareness information of current users; fourthly, visually displaying awareness results; fifthly, creating an operational mechanism of the system. Displayed contents of the awareness results include a current operation model, a current task, a current task flow diagram, an object diagram, a total task list, other tasks and relevant personnel. The method has the advantages that the information concerned by the users is displayed in proper modes, so that convenient and simple user interfaces are provided for the users, the users can concentrate on completing the tasks, the collaborative work efficiency can be improved, and the method has a wide application prospect in the fields of computer-supported collaborative work and complex product development.

An ultrasonic guided wave detector for detecting length of anchor bolt is prepared as connecting arbitrary function generator to change - over switch through power amplification module, connecting change - over switch to guide wave transmitting - receiving element and gain amplification module, connecting gain amplification module to waveform analysis and display module.

The invention discloses a treatment method for recycling potato starch production factory wastewater, relating to the technical field of starch wastewater treatment. The method comprises the following steps: precipitating, regulating the pH value of the precipitate with acid, regulating the pH value of the precipitate with alkali, exchanging and recycling heat, carrying out anaerobic treatment, aerobic biochemical treatment and ultrafiltration membrane treatment, and detecting emissions. The COD (chemical oxygen demand) of the wastewater treated by the method is less than 50 mg / L, the chroma removal rate of the wastewater is not lower than 99%, and the water quality chroma index is lower than 10 times. The invention has the advantages of low treatment cost, high operation stability and high treatment efficiency, can generate additional economic benefits, and is suitable for wide popularization.