65results about How to "Fix unstable performance" patented technology

Ultrathin intelligent antenna in use for time-division system includes feeding net, printed vibrator, calibration net, reflecting plate, and antenna outer cover. Characters are that the printed vibrators welded to the feeding net composed of microstrip circuit vertically constitute antenna array fixed on the reflecting plate. Through cable, antenna array connected to the calibration net constitutes main body of antenna. Connection cable for antenna array and calibration net is coaxial cable with SMA adaptor at two ends. There is certain proportional relation between distance from array to array and wavelength. The invention solves issue of unstable antenna performance existed for long time. Features are: lowering thickness of antenna, raising consistency and mechanical properties of antenna produced.

The invention discloses a preparation method of a fluorescent oxidized nanocellulose thin film with the adjustable light color. The preparation method comprises the steps: cellulose nanofibers (CNFs)are adopted as a raw material to be oxidized and dispersed firstly, and then oxidized nanocellulose aqueous dispersion liquid is obtained; then misch metal organic frameworks of LnCl3.6H2O and 1,3,5-benzene tricarbonic acid are dissolved in DMF, wherein Ln is Eu and Tb; the nanocellulose aqueous dispersion liquid prepared in the step S1 is dripped into a DMF solution to be evenly stirred; and a heating reaction is carried out under a sealed condition, then a reaction system is gradually cooled to the room temperature at the speed of 15 DEG C/h, subjected to suction filtration to remove a solvent and dried, and the fluorescent oxidized nanocellulose thin film with the adjustable light color is obtained. Through the coordination effect of carboxyl on oxidized nanocellulose and rare-earth metal ions, the hydrogen bond effect between oxidized nanocellulose fibrils, and the physical doping effect between the coordination effect and the hydrogen bond effect, stability of the material is improved; and the preparation method has wide application prospects in the fields of fluorescent falsification preventing, biosensors and fluorescent imaging.

The invention discloses a method for preparing an inorganic lead-free halide perovskite film by coevaporation. The method comprises the following steps: (1) carrying out ultrasonic cleaning on a substrate material, and blow-drying with nitrogen for later use; (2) putting the substrate material on a coevaporation plant sample holder, vacuumizing the vacuum chamber until the vacuum degree is less than 5*10<-4>Pa, heating and rotating the substrate material, and keeping the temperature; (3) regulating the temperatures of a CsX evaporation source and an SnX2 evaporation source so that the CsX evaporation source and SnX2 evaporation source control the evaporation rate of the substrate material together; and (4) after the temperatures of the evaporation sources reach the set values and the evaporation rates become stable, carrying out double-source coevaporation deposition of the inorganic lead-free halide perovskite film, and cooling to room temperature, thereby obtaining the inorganic lead-free halide perovskite film. The inorganic lead-free halide perovskite film has the advantages of high stability, low cost, smooth surface, fewer internal defects, technique repeatability, environment friendliness and no pollution, and is suitable for large-scale industrialized production.

The invention belongs to the technical field of polymers, and relates to a method for preparing microgel composite hydrogel from a naturally dried polymer. The method comprises the following steps of reactive microgel emulsion preparation, dispersed liquid preparation, pre-polymerized liquid preparation, microgel composite polymer preparation, natural dehydration and heating treatment. The method is characterized in that acrylamide is utilized as a main monomer; N-hydroxymethyl acrylamide is utilized as a functional monomer; and a prepared microgel composite polymer is dehydrated in a natural environment and then is heated to form the microgel composite hydrogel. The method can prepare the microgel composite hydrogel from a naturally dried polymer by heating treatment, so that all microgel composite hydrogel preparation processes are easy to be controlled and performance instability caused by water-containing polymer excessive dehydration in heating is avoided. The microgel composite hydrogel obtained by the method has excellent mechanical properties, wherein tensile strength of the microgel composite hydrogel is obviously higher than that of hydrogel prepared from a polymer with water content of 75% by heating.

The invention discloses a two-dimensional crystal material field effect transistor, which comprises a semiconductor substrate, a dielectric layer, a metal gate, a gate dielectric layer, a channel layer, a graphene layer, a two-dimensional crystal protection layer, a source electrode and a drain electrode. The invention further discloses a method for preparing the two-dimensional crystal material field effect transistor. A two-dimensional crystal material directly grows on the gate dielectric layer in a self-aligned manner, and doped graphene is adopted as a source and a drain and connected with metal as the source electrode and the drain electrode to prepare the field effect transistor. According to the two-dimensional crystal material field effect transistor and the preparation method thereof, the field effect transistor with stable two-dimensional crystal material film property can be manufactured by adopting a conventional CMOS manufacture procedure; and the ultimate target of preparing a small-size and large-scale two-dimensional crystal field effect transistor array is achieved.

The invention is an actuator control system and method based on deep learning and deep neural network, and belongs to actuator control technology. The system includes a machine vision recognition module, a PID controller, a motor module, a camera and an upper computer. The machine vision recognition module uploads video information obtained by the camera to the upper computer to obtain image feature data after image processing; the upper computer inputs target angle value of motor, and the PID controller obtains error value according to current actual angle value and target angle. Its change rate and cumulative value are input into the PID neural network with the data of image features, the current actual angle value of the last motor and the output value of the last PID controller. Afteranalysis and calculation, the three coefficients of the PID algorithm are output and input into the PID controller. The output value is calculated and transmitted to the motor to control the angle change of the motor. The invention combines machine vision recognition and PID algorithm, effectively solves the problem of unstable performance of traditional steering gear in various or variable environments.

The invention discloses a chemical synthesis method for an environment-friendly inorganic lead-free halide perovskite thin film. The chemical synthesis method comprises the steps of (1) dissolving SnX<2> into an organic solvent, and performing magnetic stirring until the SnX<2> is fully dissolved; (2) adding CsX and stirring in a light-shading condition to obtain a CsSnX<3>/Cs<2>SnX<6> inorganic lead-free halide perovskite precursor solution; (3) performing ultrasonic cleaning on a substrate material, and drying by nitrogen; (4) putting the substrate material into an ultraviolet ozone cleaner to be subjected to radiation treatment; (5) paving the CsSnX<3>/Cs<2>SnX<6> inorganic lead-free halide perovskite precursor solution on the bottom surface of the substrate material, and performing spin coating; and (6) heating the material and performing thermal insulation for a certain time, and cooling to room temperature to obtain the CsSnX<3>/Cs<2>SnX<6> inorganic lead-free halide perovskite thin film. The CsSnX<3>/Cs<2>SnX<6> inorganic lead-free halide perovskite thin film prepared by the chemical synthesis method is high in stability, low in cost, low in equipment requirement, green, environment-friendly and pollution-free, and suitable for large-scale industrial production.

The invention relates to separation and screening of lactobacillus salivarius in the pig intestinal tract and biologically fermented feed produced by lactobacillus salivarius as an inoculant and belongs to the field of high quality strain screening and solid feed. According to self-characteristics, microorganisms such as lactic acid bacteria produce a large amount of organic acid such as lactic acid through fermentation under anaerobic conditions so that feed pH is reduced and thus the number of lactic acid bacteria is increased and harmful bacteria in the feed are reduced. The lactobacillus salivarius is isolated from the healthy pig intestinal tract and has the characteristics of fast growth rate and high lactic acid yield. The fermented feed produced by inoculating complete feed or a feed raw material with the lactobacillus salivarius is environmentally friendly and safe, has a thick sour fragrance and is well received by animals.

The invention discloses a database backup allocation method and a database backup allocation device. The method includes steps of generating a backup strategy according to IP information of a to-be-backup allocation server and to-be-backup database edition information; analyzing the type of the to-be-backup database and judging if the backup is performed in the backup database according to the backup strategy; if it is, performing backup at the to-be-backup database; judging if the server load of the to-be-backup allocation server can meet the preset backup threshold value; if it is, performing backup on the data of the to-be-backup database according to the backup strategy, and storing the acquired backup data. Through the method and the device, the database backup efficiency is improvedand the stability of a business system is guaranteed.

The invention provides a system for querying question auxiliary information through codes in teaching auxiliary materials. The system includes a plurality of unrepeated codes corresponding to the questions one by one, a code inputting module, a question auxiliary information database, a code matching module, and a display module. The plurality of unrepeated codes are corresponding to the questions one by one and are printed at the head, tail and middle of each question or page footers; the code inputting module is used for inputting the codes; the question auxiliary information database includes question auxiliary information corresponding to the questions one by one, and each question auxiliary information has only one identification code; the code matching module is used for corresponding the input codes to the identification codes to correspond the questions to the question auxiliary information; and the display module is used for displaying the question auxiliary information corresponding to the codes. The invention further provides a corresponding query method. The system and method can solve the problems that the effect of searching questions by taking pictures is unstable or two-dimensional codes or bar codes are large in size and cannot be used in large scale, and have the characteristics of rapidity, convenience, and stability.

The invention discloses an intelligent recommendation method for an enhanced CT contrast agent injection scheme. The method comprises the following steps: (1) establishing a case data storing multiple groups of case information into the database to form the case database; (3) establishing an expert knowledge establishing the expert knowledge base according to the contrast agent injection routine information; (3) inputting a case: inputting case information of a patient to be injected, generating a default value and forming a screening case library; (4) outputting injection scheme parameters: generating different injection scheme parameters according to the default value quantity and default information in the case information of the patient to be injected; and (5) forming an injection scheme: forming the injection scheme on the basis of the contrast agent injection scheme parameters output in the step (4). Compared with the prior art, injection of the contrast agent can be more scientific and standardized, medical accidents can be effectively reduced, the health of patients is effectively guaranteed, the quality of CT images is improved, and the method is worthy of application and popularization in the field.

The invention relates to a general suspension granulation method for preparing a sintered metal-graphite composite. The general suspension granulation method includes the steps that graphite particlesare suspended in an air flow with a fluidized chamber; binder solutions are introduced into the fluidized chamber; metal powder is introduced into the fluidized chamber; and after preset fluidizationtime, the graphite particles adhere to the metal powder through binders to form core particles. By adjusting the fluidization air pressure and the fluidization time, each graphite particle can adhereto a metal layer with a certain thickness to obtain the core particles with a predetermined critical dimension. At the moment, above the critical dimension, because the fluidized air flow cannot support the gravity of the core particles, the core particles fall and are collected in a material bin at the bottom of a bed body. The method is high in universality and can be applied to raw material granulation processes of a variety of metal-graphite composite products, the phases of subsequent objects manufactured by the obtained composite powder core are uniformly distributed, density is uniform, and mechanical properties are good.

The invention relates to a microelement-introducing weathered coal activating agent as well as an activation method and application. The activating agent is an aqueous solution containing zinc-ammonia complex ion, is prepared by reacting zinc salt aqueous solution and excessive ammonia water, and is used for extracting humic acid in weathered coal. The activation method comprises the steps of uniformly spraying the activating agent to the surface of weathered coal, uniformly stirring, reacting at the temperature of 40-50 DEG C for 2-3 hours, and placing for 10-20 hours to obtain activated weathered coal. By the method, the extraction rate of water-soluble humic acid is improved, nitrogen is introduced and microelements required by crops are also introduced to form chelate with humic acid,and the high-temperature stability of water-soluble humic acid is improved. The prepared activated weathered coal fertilizer can be widely applied to various crops and soil.

The invention relates to a method for recycling and preparing a modified polypropylene composite material from a waste polypropylene pipeline, and belongs to the field of high polymer material processing. The preparation method comprises the following steps: terylene, chinlon, spandex, a polypropylene pipeline attached with terylene, chinlon and spandex, a compatilizer and an antioxidant are treated by using a press vulcanizer, an aggregating machine and an internal mixer; the purpose of uniformly dispersing the mixed material and the polypropylene material is achieved; the obtained modified polypropylene is high in tensile strength; compared with the prior art, the high-molecular regenerated material has the advantages that the flexibility and elasticity are better, the bending property is good, the toughness is high, the high-molecular regenerated material with excellent comprehensive mechanical properties is prepared, the utilization efficiency of a polypropylene pipeline to which terylene, chinlon and spandex are attached is improved, secondary pollution is reduced, the economic benefit of reutilization is increased, and the high-molecular regenerated material has relatively advanced process technology and application value.

The invention provides a radio frequency device and a double-ended short-circuit dielectric filter thereof. The filter comprises a cavity, a cover plate, a dielectric resonant plate and an elastic connection plate. The cavity is fixedly connected with the cover plate to form a resonant cavity. Short-circuit grooves are arranged on two opposite sides of the cavity. The dielectric resonant plate is arranged in the resonant cavity, and two ends are respectively inserted in the short-circuit grooves on two opposite sides of the cavity. The elastic connection plate is elastically crimped to both ends of the dielectric resonant plate, so that both ends of the dielectric resonant plate are in compression connection with the corresponding short-circuit groove, and reliable short-circuit contact connection between the dielectric resonant plate and the cavity is ensured. According to the double-ended short-circuit dielectric filter, reliable short-circuit connection between both ends of the dielectric resonant plate and the cavity is realized through the elastic connection plate; the problem of unstable performance of the dielectric resonant plate is solved; and the novel double-ended short-circuit filter has the advantages of simple processing and assembly process, low cost, reliable short circuit and easy realization.

The invention relates to manufacturing and application of a semiconductor nanometer ultraviolet light detection and gas sensing integrating device. A chemical vapor deposition method is adopted, in the middle section of the surface of a p-type Si/SiO2 substrate, a two-dimensional structure ZnO semiconductor nanosheet is compounded, symmetrical Au/Ti metal electrodes are plated along the two ends of the compounded ZnO nanosheet, any one of polymers in PDMS, PMMA and PVC is adopted to coat a metal electrode layer, and aluminum foil non-transparent to ultraviolet and visible light is utilized to block out other parts except the middle two-dimensional structure ZnO semiconductor nanosheet to prepare into the device. According to the manufacturing and application of the semiconductor nanometer ultraviolet light detection and gas sensing integrating device, the purposes of stably probing ultraviolet signals under different environment atmosphere conditions and detecting organism molecules under room temperature conditions are achieved, and the problem that a semiconductor ultraviolet detector is instable in performance under environment atmosphere conditions is solved. The semiconductor nanometer ultraviolet light detection and gas sensing integrating device has the advantages of being simple in structure, fast in response, high in sensitivity and capable of working under room temperature.

The invention belongs to the field of composite fiber preparation, and particularly relates to a composite graphene PP master batch and its preparation method. The composite graphene PP master batch is prepared from, by weight, graphene, sodium polyacrylate, cationic surface active agent, filler, microcrystalline cellulose, solvent, silica gel, and plant polyphenol, wherein the filler is one or more at any mass ratio of aluminium oxide, aluminite powder, titanium dioxide or pyrophyllite powder; the solvent is ethanol or acetone; the graphene is 3-10 layers of graphene. The composite graphene PP master batch can effectively improve the comprehensive performance of the PP fiber.

The invention discloses an environment-friendly binding agent for a corrugated carton. The environment-friendly binding agent for the corrugated carton is prepared from the following components in parts by weight: 100 parts of modified starch, 5 to 10 parts of polyvinyl alcohol and 0.5 to 1 part of an anti-foaming agent; first, the starch is swelled and activated; then, substitution reaction is performed by adopting the stable modifying agent which is obtained by performing nucleophilic addition by non-toxic and eatable resveratrol and hydrogen iodide; a starch active centre is substituted bythe stable modifying agent; iodide ions leave and form a stable bond; an unstable ether bond is substituted by a polar functional group with new characteristics in the modified starch, so that the stability of the starch is increased, and the problem that the starch performance is unstable is solved; in addition, the introduced active phenolic hydroxyl group has a sterilizing effect, and the mildew of the starch is prevented; the prepared binding agent is not added with formaldehyde and is environment-friendly; the bonded corrugated carton can be applicable to the packaging of a plurality of products.

The invention discloses a horizontal constant-speed material receiving device which comprises a first supporting seat, a first connecting seat, a second connecting seat, a second supporting seat, a separating ring, a material distributing rotary disc, a first rolling mechanism, a second rolling mechanism, a first encoding mechanism, a tension mechanism and a second encoding mechanism. The first connecting seat, the second connecting seat and the second supporting seat are all arranged on one side of the first supporting seat, the second connecting seat is located between the first connecting seat and the second supporting seat, the first connecting seat is located between the first supporting seat and the second connecting seat, and the position, close to the right side, of the front end of the first supporting seat is connected with a material distributing rotary column. The material distributing rotary disc is installed at the position, close to the front portion, of the outer surface of the material distributing rotary column. According to various aspects, the problems that the material receiving effect is poor due to the fact that the material receiving speed cannot be adjusted and controlled and the material receiving efficiency is low due to the fact that only one material can be received in an existing scheme can be solved.

The invention discloses a magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and a preparation method of the magnesium-doped calcium silicate crystal nucleus early strength agent. The magnesium-doped calcium silicate crystal nucleus early strength agent is prepared from the following components in parts by mass: 0.1-5 parts of acid liquor; 1-20 parts of a dispersant; 0.2 to 5 parts of soluble magnesium salt; 3 to 30 parts of soluble calcium salt; and 3-30 parts of soluble silicate. Magnesium ions easily enter the structure of the silicate polymer and react to generate a hydrated magnesium silicate gel network, and the gel network increases steric hindrance and can prevent mutual aggregation of crystal nucleus particles, so that the effect of stabilizing the crystal nucleus particles is achieved, and the crystal nucleus suspension is kept stable for a long time. Meanwhile, after magnesium ions are doped, unreacted dispersing agent molecules can be complexed, so that the reaction rate of the dispersing agent is increased, the specific surface area of the nanocrystal nucleus is also increased, the cement hydration promoting effect of the nanocrystal nucleus is improved, and the early strength of cement is improved.

The invention discloses a PMOS transistor forming method. The method comprises the steps: adding a fifth subphase that the flow gradually decreases between a first subphase that a germanium source gas flow gradually increases and a second subphase that the flow is table for a phase that silicon germanium seed crystal is formed in a sigma groove of a source-drain region, wherein the initial flow of germanium source gas at the fifth subphase is equal to the tail flow of the first subphase; and/or adding a sixth subphase that the flow gradually decreases between a third subphase that a gas flow gradually increases and a fourth subphase that the flow is table for a phase that a bulk material is formed, wherein the initial flow of germanium source gas at the sixth subphase is equal to the tail flow of the third subphase. The method can the flow abrupt changes at the joint of the first and second subphases and/or the joint of the third and fourth subphases from causing the abrupt increase of the content of germanium in a formed silicon germanium material, avoids the mismatching of the silicon germanium material crystal lattices, and avoids current leakage caused by that carriers of the source-drain regions enter a trench region because of the recessing of a side wall of the sigma groove.