21results about How to "Low decay rate" patented technology

The present invention relates to a method for preparing a reverse osmosis membrane and a reverse osmosis membrane prepared thereby. The method comprises the following steps: preparing a polymer solution as a membrane casting solution, and coating a reinforcing material with the membrane casting solution to form a polymer supporting layer; a desalination layer is formed by contacting a polymer support layer with an aqueous phase solution containing an amine compound and an oil phase solution containing an acyl chloride compound in a slit coating manner, in which N slit coating heads are respectively provided in the lateral direction during contact with the oil phase solution so as to respectively form N coating regions, and from the second coating region, N is a positive integer greater than or equal to 1, and N is a negative integer greater than or equal to 2. The coating flow of each coating area is gradually increased relative to the coating flow of the previous coating area; and performing post-treatment to obtain the reverse osmosis membrane. The reverse osmosis membrane prepared by the method provided by the invention has gradual change performance (including gradual change of water flux and gradual change of desalination rate), effectively reduces the flux attenuation of the membrane element in the operation process, and improves the anti-pollution performance.

The utility model discloses a high temperature and high pressure resistant radio frequency cable for a nuclear power station, which comprises an inner conductor, the inner conductor is arranged at the central position of the radio frequency cable, an insulating layer, a shielding layer and a sheath layer are sequentially coated on the circumference of the inner conductor from the inner layer to the outer layer, the radio frequency cable also comprises an outer armor layer, and the outer armor layer is coated on the circumferential outer side of the sheath layer. The outer armor layer is made of metal wires. The utility model provides a radio frequency cable scheme which is extremely low in attenuation, resistant to large-dose irradiation, resistant to high temperature and high pressure and capable of meeting the requirements of low smoke, zero halogen and flame retardance.

The preparation method comprises the following steps: adding a phosphor salt and urea into a carbon source, uniformly stirring, dissolving in water, carrying out a hydrothermal reaction at 180-200 DEG C, carrying out a series of purification operations such as suction filtration, high-speed centrifugation and dialysis, and obtaining the fluorescent carbon dots. Completely evaporating the solvent to dryness, replacing the solvent with equivalent absolute ethyl alcohol, fully dissolving by ultrasound, and filtering by using an organic filter head; the method solves the problems that the existing curcumin content detection cost is relatively high, the detection and analysis index error of a fluorescence analysis method is obvious, and the pretreatment process is relatively tedious. According to the method, after the curcumin and the fluorescent carbon dots have a synergistic effect, the characteristic half-peak width of a fluorescence emission spectrum of the coexisting solution, namely the light color purity in the coexisting solution, is regularly changed, and the content of the curcumin which promotes the change of the light color composition of the coexisting solution is measured according to the numerical value change condition of the half-peak width; and a curcumin quantitative analysis technology taking the high-performance fluorescent carbon dots as a detection medium is realized.

The present application relates to the technical field of tethered unmanned aerial vehicle, and discloses an unmanned aerial vehicle energy supply system and method based on optical fiber cable, comprising: an energy supply station arranged on the ground or carried on a mother ship; a light flexible high-energy laser transmission optical cable, the first end of which is optically coupled with the energy supply station; and an unmanned aerial vehicle, which is provided with an optoelectronic conversion unit, the second end of the light flexible high-energy laser transmission optical cable being releasably physically connected with the optoelectronic conversion unit, for receiving a high-energy laser beam transmitted through the light flexible high-energy laser transmission optical cable, and converting the high-energy laser beam into electric energy through the optoelectronic conversion unit to provide all or part of the electric power required for flight and task load; through the laser-electric energy conversion mode based on the light flexible high-energy laser transmission optical cable, the decoupling of the hovering height and the operation radius of the unmanned aerial vehicle is realized, the restriction of the self-weight of the on-board battery on the flight performance is eliminated, and the unmanned aerial vehicle can still maintain stable hovering and long-time hovering in a complex airflow environment.

The invention discloses a hot-coated high-barrier heavy-wrapping roll film and a preparation method thereof. Belongs to the technical field of packaging materials. The roll film sequentially comprises an outer-layer base material film, a middle barrier layer and an inner-layer heat sealing film. The middle barrier layer is formed by drying and curing nano-composite barrier liquid coated on the inner surface of the outer-layer base material film; the nano-composite barrier liquid comprises polyvinyl alcohol, a surface-modified inorganic nano-material dispersion liquid, a polymer emulsion, a cross-linking agent and a wetting agent. After being preheated, the barrier liquid is coated by micro gravure, is dried through three stages of rapid shaping, deep crosslinking and high-temperature densification in sequence, and is finally compounded with an inner-layer heat-sealing film in a solvent-free manner. Through precise coupling of a synergistic effect among specific components and a multi-stage drying process, the roll film has excellent initial oxygen barrier property, water vapor barrier property, excellent stability in a high-temperature and high-humidity environment and high barrier stability after simulating a dynamic mechanical load of heavy packaging and transportation.

This invention relates to the field of computer vision, specifically to a passive domain adaptive target detection method and electronic device based on pseudo-label confidence feedback, comprising the following steps: S1, acquiring a pre-trained source domain model and unlabeled target domain data; S2, constructing a mean-teacher self-training architecture; S3, generating pseudo-labels and calculating confidence feedback signals; S4, implementing an adaptive dynamic mean-teacher update strategy. This invention, by introducing a pseudo-label confidence feedback mechanism, enables the model to have adaptive adjustment capabilities, effectively suppressing the adverse effects of low-quality pseudo-labels on model training; it can dynamically reduce the decay rate in high-quality pseudo-label scenarios, improving cross-domain transfer efficiency and detection accuracy; this invention effectively alleviates the "confirmation bias" problem in passive domain adaptive tasks, significantly improving the model's training stability, noise resistance, and cross-domain target detection performance in the target domain, possessing good application value and promising prospects for promotion.

The invention discloses a solar cell piece with high reliability and a preparation method, and belongs to the technical field of photovoltaic solar panel production, and the solar cell piece comprises a suede structure layer, an intrinsic amorphous silicon layer, a doped microcrystalline or amorphous silicon layer, a transparent conductive film layer, a metal auxiliary grid line layer, a protective film layer and a confluence body which are sequentially prepared on the surface of a monocrystalline silicon piece layer, therefore, impurities are prevented from entering the solar cell from the surface of the solar cell. The protective film layer can effectively prevent water vapor or other impurities from invading the solar cell. The metal grid line layer is protected from water vapor corrosion, and the service life of the metal grid line layer is prolonged. And meanwhile, the transparent conductive film layer and the interior of the silicon wafer are protected, impurities are prevented from entering to influence light transmission and further influence the light conversion efficiency of the solar cell, and the attenuation rate of the solar cell is reduced.

The invention provides a method for preparing an additive solution of an atomizer, the additive solution and the atomizer. The method comprises a step of removing cations. According to the method, aroma components are reserved, and the problems of core pasting and coking of the electronic atomizer are solved.

The invention discloses a sludge filter-pressing dehydration method and a double-diaphragm filter-pressing system. The method comprises the following steps: forming mixed sludge; conveying the mixed sludge into a filter pressing chamber; hot water at a preset temperature in the hot water tank is conveyed into a filter pressing chamber of the double-diaphragm filter press through the circulating hot water supply structure, so that the hot water exchanges heat with mixed sludge in the filter pressing chamber, the squeezing structure is controlled to squeeze a diaphragm chamber of the double-diaphragm filter press, the diaphragm chamber squeezes the mixed sludge in the filter pressing chamber, and the mixed sludge in the filter pressing chamber is discharged; carrying out filter pressing on water in the mixed sludge to form a filter cake from the mixed sludge; mixed sludge in the feeding channel is purged through the reverse purging structure, the mixed sludge in the feeding channel is discharged, the reverse purging structure continues to purge the feeding channel, and compressed air is discharged from the space between the adjacent filter plates of the double-diaphragm filter press and takes out moisture in the filter pressing cavity. The method has the advantages that the water content of the mixed sludge is reduced, and the transportation and disposal cost is reduced.

This utility model provides a small-diameter digital communication transmission cable, comprising: multiple pairs of twisted wires, wherein the twisted wires are arranged on both sides of a "I"-shaped filler and twisted together to form a cable core, and the outer side of the cable core is provided with a wrapping layer, a metal foil and plastic composite layer and an outer sheath from the inside to the outside; it solves the technical problems of traditional cables being unable to achieve small outer diameter, high bandwidth, strong anti-interference, long-distance transmission and high durability, and can optimize the cable core structure to improve anti-interference performance and signal transmission bandwidth while ensuring small outer diameter and high flexibility of the cable, and takes into account electromagnetic protection and mechanical strength through composite shielding design, thereby meeting the requirements of high-speed, long-distance and high-reliability communication.

This utility model discloses an ultra-low temperature radio frequency coaxial cable, comprising an inner conductor, an insulator, an outer conductor, and a sheath arranged sequentially from the inside out. It also includes a superconducting reinforcement layer, a buffer compensation layer, and a vacuum insulation layer. The superconducting reinforcement layer is disposed between the inner conductor and the insulator, and the buffer compensation layer is located between the insulator and the outer conductor. The inner and outer sidewalls of the buffer compensation layer are respectively attached to the outer sidewall of the insulator and the inner sidewall of the outer conductor to absorb the stress caused by the difference in thermal expansion coefficients between the inner and outer conductors under ultra-low temperature conditions. The vacuum insulation layer is fitted onto the outer peripheral wall of the sheath and has an insulating cavity inside. The superconducting reinforcement layer reduces the radio frequency loss of the inner conductor, while utilizing the superconducting Meissner effect to suppress eddy current interference in signal transmission, reducing the signal attenuation rate in the superconducting state, and effectively shielding low-frequency electromagnetic noise. It also absorbs the stress caused by the difference in thermal expansion coefficients between the inner and outer conductors under ultra-low temperature conditions.

The invention relates to a high-performance organic silicon packaging adhesive for a photovoltaic module, the packaging adhesive is an organic high-molecular compound taking a silicon-oxygen bond as a main chain, and a colloidal elastomer is formed after the packaging adhesive is cured; the working temperature range of the packaging adhesive is-55 DEG C to 250 DEG C, the light transmittance of the packaging adhesive in a visible light range is not lower than 92%, and after the packaging adhesive is aged for 1000 hours under the double-85 test conditions of 85 DEG C and 85% relative humidity, the light transmittance retention rate is larger than 95%; the packaging adhesive is prepared from a monomer mixture containing dimethyl dichlorosilane and methyl trichlorosilane through high-temperature reaction, hydrolysis and condensation processes under the action of a composite catalytic system of copper and various high polymer materials, and finally a network polymer with linear and cross-linked structures is formed. The core purpose of the invention is to provide a revolutionary photovoltaic packaging material which is high in light transmittance, extremely stable in chemical property, capable of greatly improving the reliability, the service life and the power generation efficiency of a component, and environment-friendly and recoverable.

This invention belongs to the field of thermal storage materials technology and discloses a high thermal conductivity, low expansion magnesium-based thermal storage alloy, which is composed of the following components by weight percentage: 81.2% WE43 rare earth magnesium alloy, 8% Ti2AlC powder, 6% manganese powder, 4% aluminum powder, and 0.8% boron powder. Using WE43 rare earth magnesium alloy as a stable matrix, and combining Ti2AlC powder with manganese, aluminum, and boron powder, an optimal ratio system of matrix, high thermal conductivity phase, and gradient phase precursor is constructed. This achieves synergy between the thermal conductivity of Ti2AlC and the low expansion of the Mn-Al-B gradient phase, fundamentally solving the problem of the mutual constraint between thermal conductivity and low expansion performance in traditional magnesium-based alloys. The Ti element acts as a bridge to strengthen the bond between the bifunctional phase and the magnesium matrix, preventing functional phase detachment and aggregation. Ti2AlC forms a continuous thermal conductivity path to improve heat transfer efficiency, while the Mn-Al-B gradient phase precisely controls the coefficient of thermal expansion, enabling the alloy to maintain high thermal conductivity, low expansion, and low decay rate over a wide temperature range. Furthermore, its high density and excellent surface quality enhance its structural stability and recyclability.

The invention discloses an optical fiber preform loose body integrated sintering furnace and a sintering method thereof.The sintering furnace comprises a laser transceiver, a quartz furnace core tube and a sintering furnace body, the sintering furnace body comprises an upper sintering furnace body and a lower sintering furnace body which are concentrically arranged, and the quartz furnace core tube is concentrically arranged in the sintering furnace body; an air inlet is formed below the quartz furnace core tube, and an air outlet is formed above the quartz furnace core A sintering guide rod is arranged in the center of the quartz furnace core tube, and matched fixing devices are respectively arranged on the quartz furnace core tube and the sintering guide rod; the laser transceivers are arranged at the top end of the upper sintering furnace and an inlet of the quartz furnace core tube. The optical fiber preform loose body integrated sintering furnace designed in the scheme is of an up-down double-sintering structure which is arranged up and down, the structure is simple, space saving is facilitated, the lower half section can be sintered while the upper half section of the sintering furnace conducts dehydration, and meanwhile the effects of saving cost and simplifying the production process are achieved.

The invention relates to a visual intelligent network distribution frame and a control system, and aims to solve the limitations of the traditional network distribution frame in the aspects of tedious wiring, lack of visual management, insufficient expansibility and flexibility, insufficient optical fiber connection support and the like. Therefore, the operation and maintenance personnel can quickly know the network state and perform configuration and management, so that the operation and maintenance efficiency and accuracy are greatly improved. Meanwhile, the intelligent connection management technology is adopted, automatic identification and connection management of the cable are achieved, and the risk of manual operation errors is reduced. The distribution frame supports photoelectric mixed use, meets diversified application requirements, provides high-speed optical fiber connection, and improves the performance and expandability of a network. The modular design enables the distribution frame to be flexibly configured and expanded according to actual demands, reduces the deployment cost, and improves the availability and flexibility of the system.

This invention provides a hydrophobically modified quaternized cellulose adsorbent material, its preparation method, and its applications, belonging to the field of new material preparation technology. Addressing the problems of low removal efficiency and poor adaptability to complex water qualities of existing cellulose-based materials for short-chain perfluorinated and polyfluoroalkyl substances (PFAS), this invention employs a two-step method: cellulose is alkalized in a sodium hydroxide solution and then reacted with glycidyltrimethylammonium chloride to obtain quaternized cellulose; it is then dispersed in water, and hydrophobically modified with fluorinated silane and ethyl silicate, resulting in a bifunctional adsorbent material possessing both quaternary ammonium and perfluorinated hydrophobic groups. This material achieves a removal rate of 83% for short-chain PFAS (PFBA) through a synergistic mechanism of electrostatic adsorption and fluorine-fluorine interaction. Even after five adsorption-desorption cycles, the removal rate remains above 76%, and it exhibits stable performance in complex water bodies with high salinity and high organic loads, making it suitable for the deep purification of wastewater contaminated with PFAS.

The application discloses a kind of AEM electrolytic cell health diagnosis and adaptive pulse control method and system, belong to electrolytic water hydrogen production technical field, collect AEM electrolytic cell voltage, hydrogen leakage, hydrogen purity, alkali concentration multi-source data, construct the feature vector containing dispersion, cluster, pseudo high-frequency impedance, mass transfer, purity leakage, alkali drift multiple characteristics;Rely on feature vector to determine electrolytic cell degradation mode and generate corresponding trigger condition;When working condition meets the condition, under the constraint of parameter window, execute current, fluid, temperature multivariate pulse control;After pulse, reconstruct feature vector, accept control effect by voltage, impedance change, and adjust trigger frequency according to acceptance result, replace control strategy or trigger safety protection.

The invention relates to the technical field of bioinformatics and artificial intelligence medical treatment, and particularly discloses a colorectal cancer prognosis risk assessment method and system based on deep harmony and dynamic assessment. The method comprises the following steps: firstly, acquiring lncRNA expression data and a source tag from a sample to be detected, and then mapping the data to a standardized hidden space in which a batch effect is eliminated by utilizing a pre-trained conditional variational auto-encoder (CVAE) model to generate a feature vector; inputting the vector into a prognostic risk model to obtain a preliminary risk level; according to the method, the initial risk level and the PSI are finally output together, double information of risk classification and result confidence is provided for clinical decision making, the cross-platform generalization ability and prediction consistency of the model are remarkably improved, quantitative reliability evaluation is provided for single prediction, and the clinical practical value is enhanced.

The present invention relates to the technical field of oil and gas well cementing materials, and in particular to an acid corrosion resistant material for cementing, a preparation method and an application thereof, comprising modified basic magnesium sulfate whiskers, calcined magnesium aluminum carbonate type hydrotalcite, silicon carbide fiber and a binder in a mass ratio of 1-2:0.5-1:1-2:1-2, wherein the binder is one or two of nano silicon dioxide powder and latex powder. The present invention adopts the above-mentioned acid corrosion resistant material for cementing, a preparation method and an application thereof, and after the prepared acid corrosion resistant material is used to prepare cement slurry, the formed cement stone has the ability to resist corrosion by carbon dioxide and hydrogen sulfide acid gases, thereby ensuring that the cement sheath maintains long-term sealing ability in a carbon dioxide and hydrogen sulfide gas environment.

The invention discloses a UWB and WiFi integrated multifunctional obstacle crossing trolley which comprises an embedded platform, a front driving wheel is installed on the front side of the bottom of the embedded platform, a rear driving wheel is installed on the rear side of the bottom of the embedded platform, and a first universal wheel, a second universal wheel, a third universal wheel and a fourth universal wheel are installed at the bottom of the embedded platform. A first searchlight, a camera and a second searchlight are installed on the front side face of the embedded platform, a WIFI antenna, a first UWB antenna and a second UWB antenna are installed on the rear side face of the embedded platform, and a third UWB antenna, a fourth UWB antenna and a fifth UWB antenna are installed on the upper surface of the embedded platform. UWB (ultra wide band) antennas with high performance and high gain are adopted, so that the penetrating power of signals is improved, the attenuation rate is reduced, and the precision is improved.

The application belongs to the technical field of fuel cells, and relates to a catalyst for a fuel cell and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: pre-oxidation treatment is performed on a carbon carrier; under the protection of an inert gas, nitrogen-containing organic matter and the pre-oxidized carbon carrier are subjected to heat treatment at 500-800 DEG C to obtain a nitrogen-doped modified carbon carrier; the nitrogen-doped modified carbon carrier is contacted with a platinum salt solution to adsorb the platinum salt, and solid-liquid separation and drying are performed to obtain a supported powder; and reduction treatment is performed on the supported powder to obtain the catalyst. The catalyst prepared by the application has a mass activity greater than 200 A / g and an ECSA decay rate less than or equal to 40%.