1195results about How to "Overcome stability" patented technology

The invention discloses a method for preparing monopotassium phosphate by using wet-process phosphoric acid. The method comprises the following steps: reacting carbonyl diamide and wet-process phosphoric acid to obtain an intermediate; reacting the intermediate and potassium hydroxide to prepare a monopotassium phosphate product. The method has the advantages of short process route, low energy consumption, stable product quality, low production cost, convenience in operation and safety in production. A side product, namely, slurry can be recycled completely, an entire production process is environment-friendly, clean and free from pollution, and no waste gas, waste water or waste residues are discharged. A response is made to the policy calling of energy saving, emission reduction and clean production, the problems of complex process, instable product quality, high energy consumption and environmental pollution existing in the prior art are solved, and the purity of the obtained monopotassium phosphate product is more than or equal to 98 percent.

In an electronic device, such as an active matrix display device or the like, comprising a top gate amorphous silicon thin film transistor (10) in which one or both of the source and drain electrodes (15, 16) is of transparent conductive material such as ITO, the PECVD deposited semiconductor layer (18) extending over and between the source and drain electrodes of the TFT is formed as first and second sub-layers (18A, 18B), using different source gas compositions. A noble inert gas such as helium is used as dilutant in forming the first sub-layer adjacent the source and drain electrodes to avoid reduction problems while hydrogen is used as the dilutant in forming the second sub-layer to achieve high stability and mobility characteristics in the completed transistor.

The invention relates to composite aerogel of graphene/Prussian-blue complexes, and a preparation method and application thereof. The composite aerogel is in a three-dimensional network structure formed by graphene sheets. Particles of the Prussian-blue complexes are nano-scaled and attach to the graphene sheets. The preparation method of the composite aerogel includes adding metallic cyanide in graphene oxide suspension, allowing for dispersion to obtain suspension A, dissolving metal salt in aqueous solution containing reductant to obtain solution B, ultrasonically mixing the suspension A and the solution B, allowing for standing, and drying to obtain the composite aerogel. The composite aerogel is large in specific surface area and low in density and is highly conductive. The preparation method of the composite aerogel is simple to operate, low in cost and applicable to large-scale industrial production. The composite aerogel has excellent hydrogen storage performance, hydrogen peroxide catalytic reduction and electrochromic property.

A method for constructing pipe piles while drilling for building or bridge foundations. The construction steps are to cover high-strength prestressed concrete pipes or steel pipes with drill pipes on the ground first, and install impactors and reaming retractable drill bits at the front ends of the drill pipes. , Follow the pipe while drilling, follow the pipe retaining wall, drill to the design elevation, stop drilling, withdraw from the reaming to shrink the drill bit, use the mud pump to clean the mud and sediment, pour concrete into the pipe, and simultaneously inject pressure grout to the outside of the pipe wall , stop when concrete and grout reach the ground; the object of the invention is to propose a construction method with fast construction speed, reliable quality, less material consumption, high bearing capacity of piles, mechanized operation, and environmental protection. In the construction method of bored cast-in-place piles, the use of mud retaining walls pollutes the environment, the hole is easy to collapse during the drilling process, the quality of concrete pouring is unstable, and the prestressed pipe piles are easy to cause the soil to rise. The strength of the pile body constructed by the invention is high. , There is no sediment at the bottom of the pile, and the pile end is completely rock-socketed, which can reach more than 2 times the bearing capacity of the same diameter bored pile.

The invention discloses a method for preparing a hydrogenation catalyst composite, comprising the following steps of: (1) preparing a NixWyOz composite oxide precursor by using a coprecipitation method; (2) pulping, mixing and filtering the NixWyOz composite oxide precursor and MoO3; and (3) forming and activating the NixWyOz composite oxide precursor and the MoO3 to form a final catalyst, wherein the process of manufacturing the NixWyOz composite oxide precursor comprises the steps of: preparing acid solution A containing an active metal Ni component according to a component content proportion of the catalyst; preparing solution B containing an active metal W component according to the component content proportion of the catalyst; merging the solution A and the solution B, and adding the mixture of the solution A and the solution B into a reaction tank to gelatinize; and generating a deposited mixture to obtain the precursor containing the composite oxide NixWyOz. The catalyst prepared by the method has the advantages of uniform dispersion of metals, high use performance, and particularly higher activity for deep impurity removal process of hydrocarbon. The method is simple and convenient, and has low metal loss. The method is mainly used for preparing a bulk phase catalyst with higher metal content.

The invention discloses an entrance guard control method based on face recognition. The entrance guard control method comprises the three steps of image information collecting, data processing and entrance guard operating, wherein core data processing comprises the steps that analysis is performed on the basis of returned video images, face images are automatically captured, compared and matched with existing photos in a database, and the faces are recognized. Particularly, means such as a face detection optimization data structure, picture preprocessing and feature extracting are integrated in data processing, and therefore high-speed high-accuracy face verification and recognition are achieved. According to the entrance guard control method, the defect that traditional face monitor and recognition are poor in light change, attitude angle and time span stability is overcome, the detection rate larger than 99% and the recognition rate larger than 80% within 5 meters are achieved, and the utilization rate of traditional hardware resources is increased and the application range of network monitor is widened except that intelligent control over entrance guard and attendance is effectively achieved.

The invention discloses a method for partitioning communities in a complex dynamic network by virtue of multi-objective local search based on decomposition, and the method is mainly used for solving the problem of poor community partitioning accuracy in the course of processing the complex dynamic network in the prior art. The method is implemented through the following steps: (1) determining objective functions; (2) constructing an initial solution population, and initializing individuals in the solution population by a neighborhood real-number encoding method; (3) sequentially selecting the individuals from the solution population and then carrying out cross variation on the individuals to obtain progeny individuals; (4) updating the solution population by virtue of the progeny individuals; (5) locally searching and updating the solution population; (6) judging whether the population evolution process is terminated: if iterations reach the preset times, executing a step (7), otherwise, transferring to the step (3); and (7) selecting the optimum community partition according to the maximum module density principle. The method disclosed by the invention has the beneficial effects that two objective functions can be optimized at the same time, synchronous analysis of community partition and community evolution is realized, the community partitioning accuracy is improved, and the problem of detection of a community structure in the complex dynamic network can be solved.

The invention discloses a machine learning anti-fraud monitoring system based on transaction data. The system comprises a management platform, an ETL module, a sampling engine, a stream processing engine, a training engine, a prediction engine and a decision engine. The stream processing engine rapidly extracts and calculates characteristics of the huge original transaction data through streamed big data processing, the representative characteristics are obtained from the huge original transaction data, and information in the data is sufficiently extracted. In the model training module, various machine learning models and ensemble learning frameworks optimized for the capital loss ratio and the black sample recall ratio are used, and a composite model optimized for an indicator is obtained. The over-fitting and unstable defects due to a single model are overcome, and the stability and the generalization ability of the model are improved; according to a preset update time, the model training module automatically obtain the latest data and trains the model again, accordingly the model keeps the effectiveness all the time, and the problem of model inefficiency due to fraud variation is avoided.

The invention discloses a composite foamed cement heat retaining panel using high-volume fly ash and a preparation method thereof; the composite foamed cement heat retaining panel is prepared by 60-80 parts of cement, 20-40 parts of fly ash, 0.6-3.0 parts of moisture repellent, 0.12-0.30 part of a water reducing agent, 0.8-3.0 parts of an exciting agent, 0.3-0.50 part of anti-crack fiber, 30-60 parts of water and 4-8 parts of a foaming agent (by weight); the preparation method comprises the following steps: weighing each raw material; adding the water, the anti-crack fiber, the moisture repellent, the cement, the fly ash, the water reducing agent; stirring a mixture; adding the exciting agent; stirring the mixture; adding the foaming agent; stirring the mixture so as to prepare mixed slurry; then, injecting the mixed slurry into a mould; putting the mould statically for 4-5 hours; removing the mould; after 24 hours, cutting and packaging a product; and maintaining the product until age is 28 days. According to the invention, a part of the cement is substituted by fly ash; cost is low; environment pollution is reduced; and social efficiency and economic benefit are obvious.

The invention provides a method for manufacturing a pure titanium porous structure through selective laser melting. The method for manufacturing the pure titanium porous structure through selective laser melting comprises the following steps that firstly, a three-dimensional model of the porous structure to be manufactured is built in a computer; secondly, hierarchical preprocessing is conducted on the built three-dimensional model; thirdly, 3D printing parameters are set, hierarchical processing is conducted on the three-dimensional mode, and a file of a corresponding format is saved and exported; fourthly, the exported file is imported into 3D printing equipment, and 3D printing is conducted. According to the method for manufacturing the pure titanium porous structure through selective laser melting, metal parts with various macro-structure porous structures can be manufactured according to actual requirements, one-time forming is realized, the shortcomings of unstable mechanical properties and a simplex shape caused by a traditional processing method are overcome, and processing efficiency and economic benefit are improved.

The invention discloses a double-shaft photoelectric rotary table compound control system and a control method based on fuzzy decision. The control system comprises an integrated digital filtering, an estimation unit, a feed-forward control unit, a measuring unit, a change-over switch, a fuzzy-decision unit, a piping and instrument diagram (PID) controller, and a signal superposition unit. The double-shaft photoelectric rotary table position error e is compared with an error threshold K c set in advance, when e is less than K c, the fussy regulation is entered and regulation output controlled quantities delta kp, delta k and delta kd are obtained. PID control and regulation parameters kp, ki and kd are further obtained, and PID calculation is conducted. Otherwise, PID calculation is conducted by the utilization of the fixed regulation parameter set in advance and control signals outputted by PID are obtained. The effects of nonlinearity, time-varying characteristics, and model uncertainty on accuracy of the double-shaft photoelectric rotary table are effectively reduced. The problems of integral saturation and high frequency disturbance in the PID controller are solved, stochastic noise in the given stochastic signals is overcome, and long-term continuous stable work of the double-shaft photoelectric rotary table compound control system is ensured.

The invention discloses a high-humidity modulus viscose fiber with dry strength of 3.5-6.0cN/dtex, wet elastic modulus of 0.35-0.60cN/dtex and wet strength of 2.0-4.5cN/dtex, and prepared of cellulose pulp with degree of polymerization of 500-1200 and alpha-cellulose content >=95% by the steps of dip-basifying, squeezing, ageing, yellowing, dissolving, wet spinning moulding, drafting, etc. And it has features of higher intensity and wet modulus, better loop strength performance, and lower brittleness; and the fabrics made by it has features of high intensity, multiple deformation resistance, alkali resistance, etc.

This invention relates to nonvelocity sensor permanent-magnet synchro-motor-air conditioning compressor system. It is characterized by that nonvelocity sensor vector control is used for permanent-magnet synchromotor, so, overcoming the shortcoming of the large rotating speed pulsation. At the same time, the torque command current composite control method is used to make further lowering rotating speed pulsation of the motor. It overcomes the problem of unsatability of the system during the procedure of regulating PI regulator parameter in traditional vector control system.

The present invention discloses a TiAlN/TiAlCN multilayer coating of substrate surface and preparing method thereof, wherein a transitional layer is between a substrate and a TiAlN/TiAlCN multilayer coating; the multilayer coating is formed by alternating periodic arrangement of TiAlN films and TiAlCN films; in a period, the thickness sum of the TiAlN films and the TiAlCN films is 1-20 nano; the percentage by weight of C atom in the TiAlCN films is 0.1-5%. The multilayer coating of the present invention has the advantages of high hardness, low internal stress and high tenacity; the cutting efficiency and corrosion resistance of the substrate can be improved, and the service life of the substrate can be prolonged. In the present invention, the multilayer coating is deposited by high power pulse magnetron sputtering technique; the problems that cathode arc ion plating and depositing speed is too fast to prepare a nano epitaxial film and that target poisoning is caused during the procedure for preparing films by DC magnetron sputtering are solved; the nano modulation period is controlled via adjusting the autorotation and revolution speeds of the substrate and adjusting the quantity of targets.

The invention provides a near-infrared imaging device and an identification method based on the palm vein and the palm print. Firstly, a palm image is obtained through a near-infrared imaging device, the central subblock sample needed to be processed is extracted, the subblock is inputted into two feature extraction modules: a genus palm print information code extraction and a vein structure extraction, then the two features are respectively matched, each own similarity of the two features is respectively calculated through using different similarity evaluation methods, the optimized weighted array of the genus palm print and the vein vessel structure is obtained according to a training sample, then the two similarities perform the similarity level fusion, then the similarity level after the fusing performs decision-making and comparing according to a scheduled threshold value, and then the final determination is obtained in reference to the fusioned matching. The near-infrared imaging device and the identification method based on the palm vein and the palm print can overcome the disadvantages of less image features and single processing, and has the advantages of improving the identification rate and the stability of the system.

A method for preparing metallic nanoparticles features that 3D movement of DC arc cathode and the 1D movement of anode are automatically controlled for continuous and stable prodution and the products are classified according their granularities in vacuum condition. Its apparatus is composed of generating chamber, classifying chamber, gathering chamber and processing chamber.

The invention relates to a rapid stable joint control method for attitude maneuver of spacecraft and belongs to the field of spacecraft attitude control and vibration control. The method is invented by absorbing advantages in spacecraft attitude maneuver trajectory planing technology and input shaping technology, and allows spacecraft to maneuver in task-required time and keep attitude quickly stable within index required values after maneuvering. Torque outputting capacity of a spacecraft attitude control actuator and maximum angular velocity maneuverability of spacecraft are further considered comprehensively, so that output torque of the spacecraft attitude control actuator is easy to implement.

This invention provides a contact type optical fiber grating displacement sensor, which contains support, protective steel pipe, spring and optical fiber grating strain sensor constructed of double steel pipe assembly structure, wherein the optical fiber grating packaged in 0.5mm steel pipe by epoxy resin and forming the optical fiber grating strain sensor with two 1.2mm steel pipe. Said invention has advantages of overcoming the shortage of current sensor of easy interfered by electromagnet and poor stability.

The invention relates to an aqueous single-coating matt transferring aluminum-plating paint and a preparation method thereof. The paint comprises the following components in parts by weight: 20-70 parts of aqueous resin, 10-70 parts of deionized water, 0.5-2 parts of delustering powder, 5-30 parts of cosolvent, 0-10 parts of pigment, 0-2 parts of pH value regulating agent, 0-0.5 part of wetting agent, 0-0.2 part of flatting agent and 0.05-0.2 part of defoaming agent. Compared with the prior art, the aqueous single-coating matt transferring aluminum-plating paint has the advantages of excellent delustering property, simple production process and the like, and is environmentally-friendly.

The invention discloses a primary frequency modulation coordination control method for a wind turbine generator set, and the method comprises the following steps: 1, measuring the system frequency andfrequency change rate of the grid-connected point in real time; 2, performing load shedding control of the set through pitch changing, so that the wind turbine generator set has stable active frequency modulation capacity under different wind conditions; 3, introducing an additional torque compensation link through rotor kinetic energy control, and enabling the wind turbine generator set to havefast active response characteristics; 4, rotor kinetic energy and power backup coordinated control achieving the rapid and continuous response of the wind turbine generator set to the system frequency change trough the rotor kinetic energy and power standby coordination control. The method is applicable to each wind speed, and can achieve the same standby capacitor under different wind speeds, sothat the primary frequency modulation capability of a fan is no longer restricted by the wind speed.

The invention discloses an industrial production method of hydrolyzed wheat protein for feeding, belonging to the technical field of feed additive production. In the method, through the method of synergy of multiple enzymes and combined treatment of multiple steps, the hydrolyzed wheat protein for feeding is prepared by taking wheat gluten meal and water with weight ratio of 1:10-1:2 and adding compound enzyme, ensuring the mass percent concentration of the compound enzyme in the solution is 0.2-1.4%, hydrolyzing the mixture for 1-13h under the conditions that the temperature is 30-70 DEG C and pH value is 5.0-10.0, then carrying out such processes as filtering, decoloring and drying, etc. Compared with the traditional methods, the method of the invention features mild hydrolysis conditions, sanitation and safety and maintains the original nutritive composition of amino acid free of loss; the hydrolysate is low in salt content, mellow in mouth feel and high in yield which is up to 98%. The tests that the hydrolyzed wheat protein is added in the feed for suckling pigs, chicks, calves, aquaculture and the like to be used show that the hydrolyzed wheat protein has the advantages and evident effects of improving daily feed intake, reducing diarrhea rate, enhancing immunity, slowing weanling stress, improving growth performance and the like.

The invention relates to a conductive composition containing poly(3,4-ethylenedioxythiophene)/lignosulfonic acid and a preparation method thereof. The method comprises the following steps of: chemically oxidizing and polymerizing 100 parts by weight of monomer (3,4-ethylenedioxythiophene) and 170-300 parts by weight of an oxidant in 100-1,000 parts by weight of an aqueous solution in which lignosulfonic acid is taken as a carrier; and adding 200-500 parts by weight of a non-aqueous solvent, 10-100 parts by weight of a polyhydroxy aromatic compound and 50-200 parts by weight of a bonding agent to obtain the conductive composition containing poly(3,4-ethylenedioxythiophene)/lignosulfonic acid. A product prepared with the method meets the requirements of low production cost, transparency, high conducting performance, high adhesion and high hardness in an efficient antistatic agent, and has the characteristics of high dispersion stability, heat stability, temperature stability and water washing resistance. The conductive composition has economic and environmental protection effects as well as a good industrial prospect.

The invention provides a collagen matrix freezing gel used for biomedical materials and a preparation method thereof. The collagen matrix freezing gel is the collagen extracted from skins or tendons of healthy domestic animals using the enzyme method with the molecular weight of 280 to 320kDa and a well maintained triple helical structure; the collagen reacts for 1 to 7 days in the condition of low temperature of 0 to minus 50 DEG C in a die after through cross linked and modified reaction with hydroformylation polysaccharide, then extrudes the die and is defrosted, thus forming the collagen matrix freezing gel. The preparation of the collagen matrix freezing gel of the invention in particular relates to the extraction of the collagen, the preparation of the hydroformylation polysaccharide and the synthesis of hydroformylation polysaccharide-collagen matrix freezing gel. The hydroformylation polysaccharide-collagen matrix freezing gel prepared by the invention improves the mechanical property, thermal stability and anti-enzyme degradation, etc., of pure collagen gels, and the freezing gel has the advantages of porosity, plasticity, hydrophilic property and non-toxicity, and can be used as biomedical materials such as bio-scaffold, cell cultivation, drug controlled release and biological dressings.

The invention discloses an application of carbon nanodots as a water-soluble ratiometric fluorescent probe and solves the problems that the existing ratiometric fluorescent probes are high in preparation cost, poor in luminescent stability and provided with potential toxicity. According to the application, the carbon nanodots are dissolved in a solution to be measured, an excitation wavelength is fixed at 360-400nm,the solution to be measured dissolved with the carbon nanodots is subjected to fluorescence spectrum detection at a fixed temperature, intensities of a blue maximum fluorescence-emission peak and a green maximum fluorescence-emission peak are measured, the ratios of the blue maximum fluorescence-emission peak intensity and the green maximum fluorescence-emission peak intensity are calculated, so that the detection of the objective to be measured is achieved. The application has the advantages of being low in cost, good in luminescent stability, non-toxic, high in sensitivity and capable of achieving detection for temperature, pH of water solution, ethanol concentration in ethanol water and Fe3+ concentration in Fe3+-containing neutral water solution simply, accurately and quickly.

The invention relates to a lithium-sulfur rechargeable battery, in particular to a lithium-sulfur rechargeable battery with a graphene or graphene oxide interlayer, and belongs to the technical field of electrochemistry. An ion selective function is realized by the graphene or graphene oxide interlayer, and the defect of the original lithium-sulfur battery that the diffusion of polysulfide between an anode and a cathode causes low charging and discharging efficiency and poor battery performance stability is overcome. The selective transmission of lithium ions can be realized, and a novel solution is expected to be provided for effectively inhibiting lithium-sulfur battery technical obstacles, such as polysulfide migration. The use of the lithium-sulfur rechargeable battery in combination with a high-capacity anode material contributes to boosting of the sulfur functionalization of the lithium-sulfur rechargeable battery.