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71results about How to "Inhibitory response" patented technology

High-strength lightweight concrete containing hollow glass beads and preparation method thereof

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.
Owner:CHINA FIRST HIGHWAY ENGINEERING CO LTD +2

Double-layer microcapsule structure flame retardant, flame-retardant polyurethane material as well as preparation method and application of flame-retardant polyurethane material

The invention discloses a flame retardant with a double-layer microcapsule structure, a flame-retardant polyurethane material as well as a preparation method and application of the flame-retardant polyurethane material, and belongs to the technical field of flame retardants. The material is a multifunctional flame retardant with a double-layer core-shell structure, a shell layer is calixarene boric acid resin, a middle shell layer is melamine phthalic anhydride resin, and a core layer is hydroxyapatite modified aluminum hypophosphite. Due to the high cross-linking degree between polymers, the flame retardance of polyurethane is improved, meanwhile, the mechanical property of the polyurethane is improved, and the flame retardance and seawater corrosion resistance of the material are synergistically enhanced through hydroxyapatite dispersed in the core layer. The double-shell layer has excellent hydrophobicity, prevents internal aluminum hypophosphite from being affected with damp and has anti-fouling and self-cleaning effects, and the prepared flame-retardant polyurethane composite material has excellent tensile and flexible characteristics due to a double network of hydrogen bonds and covalent bonds.
Owner:ZHONG YU HOSES TECH CO LTD +1

Flame-retardant fiber curtain fabric and preparation method thereof

The invention discloses a flame-retardant fiber curtain fabric and a preparation method thereof, and relates to the technical field of flame-retardant fabrics, the flame-retardant fiber curtain fabric comprises a fabric substrate and a flame-retardant coating arranged on the fabric substrate, and the flame-retardant coating comprises nano-silica particles and nano-magnesium hydroxide particles in a mass ratio of 1: 1.2-2. The flame-retardant fiber curtain fabric prepared by the invention has remarkable flame retardance and thermal stability, and shows an excellent flame-retardant effect in a high-temperature environment.
Owner:ZHEJIANG WALLIFE DECORATION MATERIAL

Method for hydro-thermal treatment of sludge based on synergism of tea residues and organic acid

The invention discloses a method for synergistically hydro-thermally treating sludge based on tea residue and organic acid, which comprises the following steps: mixing sludge with organic acid and tea residue, and performing hydro-thermal treatment and dehydration treatment on the obtained mixed slurry to obtain filtrate and a mud cake. According to the method for carrying out the synergistic hydrothermal treatment on the sludge based on the tea residues and the organic acid, the hydrothermal reaction temperature can be remarkably reduced under the synergistic effect of the tea residues and the organic acid, meanwhile, the sludge is subjected to the synergistic hydrothermal treatment through the organic acid and the tea residues, the dehydration performance of the sludge can be effectively improved, and meanwhile generation of nondegradable organic matter such as melanoidins can be effectively inhibited; therefore, efficient, environment-friendly, recycling and low-cost treatment of the sludge can be realized by fully utilizing the characteristics of the organic acid and the tea residues and cooperating with a hydrothermal treatment technology, and the method has the advantages of low reaction temperature, high treatment efficiency, low energy consumption, good dehydration effect, greenness, environmental protection and the like; wide application prospects and popularization values are realized.
Owner:HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD

Benzyl alcohol rectification method and device capable of reducing generation of high-boiling-point substances

The invention relates to the technical field of benzyl alcohol preparation, and provides a benzyl alcohol rectification method and device capable of reducing generation of high-boiling residues, the rectification method comprises the following steps: S1, benzyl chloride and an alkali solution are subjected to a hydrolysis reaction, and then reaction liquid is subjected to oil-water separation to obtain an oil-phase material and a water-phase material; s2, adding the oil-phase material obtained in the step S1 into a stirring kettle, adding recycled water generated after desalting the water-phase material, stirring, and adding alkali liquor into the stirring kettle at the same time; and S3, carrying out oil-water separation on the oil-water mixture in the step S2, and transferring an oil phase into a rectifying tower for rectification. After oil-water separation of the reaction liquid, stirring an oil phase with recycled water in a stirring kettle to elute brine water droplets entrained by the oil phase, and adding a trace amount of strong alkali into the stirring kettle at the same time, so that the rectified raw oil carries water and the trace amount of strong alkali to be alkaline; hCl generated by hydrolysis of benzyl chloride is prevented from forming an acidic environment in a gas phase and a liquid phase of the whole tower, so that benzaldehyde and benzyl alcohol are prevented from generating a condensation reaction under an acidic catalysis condition to generate a high-boiling residue.
Owner:QIANJIANG XINYIHONG ORGANIC CHEM

Method for identifying touch operation and electronic equipment

The invention discloses a method for identifying a touch operation and electronic equipment, relates to the technical field of terminals, and aims to improve the accuracy of identifying the touch operation of a user so as to ensure that the touch operation of the user is accurately responded, especially under the condition that water exists on a touch screen of the electronic equipment, the touch operation of the user can be accurately responded. The problems of touch point misrecognition and misresponse caused by water can be avoided. In the application, the electronic equipment not only can identify whether water, such as static water, exists in the touch area, but also can identify whether water with variable tracks exists in the touch area, and adopts a corresponding suppression means after identification; for example, the touch action of a touch area with water is inhibited to respond, the touch action of a touch area through which water passes is inhibited to respond, and the touch action in a preset range of a historical touch track is inhibited to respond, so that the problems of mistaken recognition and mistaken response of a touch point caused by water can be avoided, and the user experience is improved. And the user experience is improved.
Owner:HUAWEI TECH CO LTD

PEF composite board and preparation method thereof

The invention provides a PEF composite board and a preparation method, and relates to the technical field of insulation boards, the composite PEF board is formed by bonding a plurality of layers of board bodies, and comprises a base layer, the base layer is prepared from the following components in parts by weight: 58 to 60 parts of HDPE (High-Density Polyethylene), 4 to 6 parts of nano montmorillonite, 1 to 2 parts of benzoyl peroxide, 2 to 5 parts of BHT (Butylated Hydroxytoluene) heat stabilizer and antioxidant, 2 to 5 parts of maleic anhydride grafted polyethylene, 0.2 to 1 part of magnesium stearate and 0.3 to 0.8 part of epoxidized soybean oil; comprising a fireproof layer which is composed of the following components in parts by weight: 45-55 parts of HDPE and 5-15 parts of a phosphate ester environment-friendly flame retardant; comprising a thermal insulation layer and is prepared from the following components in parts by weight: 45-55 parts of HDPE, 5-10 parts of lignin fibers and 5-10 parts of a bio-based foaming agent formed by mixing sodium bicarbonate and citric acid. The invention has the beneficial effects that the mechanical strength, flame retardant property and thermal insulation effect of the PEF plate are obviously improved, the weather resistance and environmental protection property are enhanced, the optimal balance of high performance and cost effectiveness is realized, and the PEF plate is suitable for various building and industrial application environments.
Owner:SHANDONG HUANENG THERMAL INSULATION MATERIAL CO LTD

Preparation method of modified aluminum lithium alloy powder and powder

The invention belongs to the technical field of metal powder material preparation, and particularly relates to a preparation method of modified aluminum lithium alloy powder and the powder. The preparation method comprises the following steps: dispersing aluminum-lithium alloy powder in an organic solvent to obtain a first alloy powder dispersion liquid; introducing dry inert gas into the first alloy powder dispersion liquid, adding hydrofluoric acid, and reacting to obtain second alloy powder dispersion liquid; a coating agent is dissolved in an organic solvent, a coating agent solution is obtained, and the coating agent comprises cellulose acetate and a wax substance; and adding a coating agent solution into the second alloy powder dispersion liquid, stirring at a preset temperature to volatilize the organic solvent and coat the alloy powder with the coating agent, and then carrying out vacuum drying to obtain the modified aluminum-lithium alloy powder. The modified aluminum-lithium alloy powder is good in stability, high in combustion efficiency and capable of actually releasing much heat.
Owner:BGRIMM ADVANCED MATERIALS SCI & TECH CO LTD +1

Preparation method of lithium slurry as well as product and application thereof

The invention belongs to the field of lithium ion batteries, and discloses a preparation method of lithium slurry and a product and application thereof, the preparation method of the slurry comprises the following steps: using a mixed organic solvent formed by mixing an etching agent and a passivating agent, dispersing a material containing lithium metal in the mixed organic solvent, and preparing the lithium slurry. According to the method, an etching agent is used for etching grain boundaries in a material containing lithium metal, a passivating agent is used for passivating grain surfaces, so that slurry containing stable micron-scale and / or nano-scale lithium-containing particles is obtained, and the etching agent and the passivating agent are selected from specific organic solvents. According to the invention, the organic solvent is adopted to carry out etching and passivation reaction on the material containing the lithium metal to obtain the slurry containing the lithium particles, and the particle size is uniform and controllable. The slurry containing the lithium particles can be used for electrode pre-lithiation and preparation of a lithium metal-based electrode and a lithium-based solid-state electrode, so that the energy density of a lithium secondary battery is improved, and the cycle life of the lithium secondary battery is prolonged.
Owner:HUAZHONG UNIV OF SCI & TECH

Synthesis method of surface octahedral oxygen vacancy double-shell Co3O4 catalyst with high electro-catalytic chlorine evolution selectivity

PendingCN119287415AMany catalytic sitesImproves bondageElectrodesHydration reactionPtru catalyst
The invention belongs to the technical field of functional nano composite materials, and particularly relates to a synthetic method of a surface octahedral oxygen vacancy double-shell Co3O4 catalyst with high electro-catalysis chlorine evolution selectivity. Comprising the following steps: firstly, mixing cobalt nitrate hexahydrate, trimesic acid, ethanol and an ethylene glycol solvent according to a certain proportion, and carrying out solvothermal reaction to obtain a spherical Co-BTC precursor; and then the prepared Co-BTC precursor is annealed and oxidized for 1-3 h in air at a certain annealing rate of 1-5 DEG C / min in an environment of 300-500 DEG C, and the hollow double-shell structure material DS-Co3O4 is obtained. Finally, DS-Co3O4 and a sodium borohydride solution are mixed, soaked and stirred for 1-3 h, the double-shell Co3O4 nanospheres with octahedral oxygen vacancies and a multilevel structure are obtained, and high-selectivity electro-catalysis chlorine evolution reaction can be achieved.
Owner:SHANDONG LONGANTAI ENVIRONMENTAL PROTECTION SCI TECH CO LTD +1

Gene edited human umbilical cord mesenchymal stem cell for treating hepatic fibrosis and liver cirrhosis and application of gene edited human umbilical cord mesenchymal stem cell

The invention relates to application of mesenchymal stem cells of overexpressed Numb genes in preparation of drugs for treating chronic liver diseases. The invention also provides a mesenchymal stem cell modified by genetic engineering, and the mesenchymal stem cell modified by genetic engineering is a mesenchymal stem cell of an overexpressed Numb gene. The invention provides a novel human umbilical cord mesenchymal stem cell (hUC-MSC) for treating chronic and acute hepatic failure, hepatic fibrosis and liver cirrhosis. The hUC-MSCs overexpressing the Numb gene can inhibit liver inflammatory response and hepatic fibrosis progress in a dose-dependent manner; biliary duct reaction is inhibited in a dose-dependent manner, and cholestasis is improved; the liver cell proliferation can be promoted in a dose-dependent manner, and the content of serum albumin is increased. And the treatment effects are better than those of the same dose of hUC-MSCs. The hUC-MSCsNumb-OE can be directly used as a cell for treating chronic and acute hepatic failure, hepatic fibrosis and cirrhosis, and also can be used as a tool for screening biological or chemical medicines for treating hepatic fibrosis and cirrhosis.
Owner:SHUGUANG HOSPITAL AFFILIATED WITH SHANGHAI UNIV OF T C M

Oxygen-vacancy-enriched copper-based nano material and preparation method and application thereof

The invention discloses an oxygen-vacancy-rich copper-based nano material and a preparation method and application thereof.The preparation method comprises the following steps that under the condition that an alcohol solvent serves as a hydrophilic agent, a copper salt solution serves as an electrolyte, constant-potential electro-deposition is conducted on the surface of hydrophobic carbon paper, the electrolyte is replaced, cyclic voltammetry current modification is conducted, and the oxygen-vacancy-rich copper-based nano material is obtained. Wherein the potential window in the cyclic voltammetry process is-0.3 V to-0.8 V. The particle size of the oxygen vacancy-enriched copper-based nano material can be 1-2 microns, and the main morphology of the oxygen vacancy-enriched copper-based nano material is a broken irregular polyhedron. The oxygen-vacancy-enriched copper-based nano material can be applied to electrocatalytic carbon dioxide reduction reaction, has high multi-carbon product selectivity and has a quite excellent CO by-product inhibition effect.
Owner:EAST CHINA UNIV OF SCI & TECH +1

Keyboard and mouse crossing method, communication system and computer readable storage medium

The invention relates to the field of terminal control, in particular to a keyboard and mouse crossing method, a communication system and a computer readable storage medium. The method comprises the steps that under the condition that a cursor of an input device is displayed on a screen of a first device, in response to a first operation, the first device controls the cursor to move out of the screen of the first device and enters a screen of a second device to be displayed, the second equipment is located in the first direction of the first equipment and is connected with the first equipment; and in response to the second operation, the second device controls the cursor to move out of the screen of the second device and enters a screen of a third device to be displayed, and the third device is located in the second direction of the second device and is connected with the second device. According to the method provided by the invention, the input device can pass through different devices, so that tedious operation is avoided, and the user experience is improved.
Owner:HONOR DEVICE CO LTD

Manufacturing method of high-safety lithium ion battery

The invention relates to the technical field of lithium battery production, in particular to a high-safety lithium ion battery manufacturing method, which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the method comprises the following steps: 1) preparing a positive plate, wherein the positive plate is composed of a positive current collector and a positive material coated on the positive current collector; the electrolyte is a safe electrolyte, the solvent comprises 10%-15% of ethylene carbonate (EC), 30%-35% of diethyl carbonate (DEC), 10%-15% of propylene carbonate (PC) and 20%-25% of propyl propionate (PP), the additives comprise 2%-3% of VC, 2%-3% of PS, 0.5-1% of LiBOB, 1-2% of SN, 2-3% of HTCN, 0.5-0.7% of LiODFB and 0.1-0.3% of FPOP, the electrolyte is LiPF6, the content is 1.1-1.2 mol, the conductivity is larger than or equal to 8.0 ms / cm, Al2O3 ceramic powder is added in the formula of the positive electrode and the negative electrode, and the safety performance is improved; the diaphragm coated with ceramic on both sides is used, and the double-sided ceramic diaphragm is small in thermal shrinkage and high in puncture resistance, so that the safety can be effectively improved.
Owner:SHENZHEN BETTERPOWER BATTERY +1

Solid-state battery

Provided is a solid-state battery capable of more sufficiently suppressing a decrease in utilization factor of a negative electrode active material although when a garnet-type solid-state electrolyte is contained in a negative electrode layer. The present invention relates to: a solid-state battery including a positive electrode layer, a negative electrode layer, and a solid-state electrolyte layer disposed between the positive electrode layer and the negative electrode layer, wherein the negative electrode layer includes a negative electrode active material containing Li (lithium), M [M is one or more elements selected from the group consisting of W (tungsten), Mo (molybdenum), Ta (tantalum), and Zr (zirconium)], and O (oxygen), and having a molar ratio (Li / M) of a Li content to a M content of more than 2.0, and a garnet-type solid-state electrolyte.
Owner:MURATA MFG CO LTD

A multifunctional composite wear-resistant and anti-blocking denitrification catalyst and its preparation method

The invention discloses a multifunctional composite wear-resistant and anti-blocking denitration catalyst and a preparation method thereof. The catalyst comprises a TiO2 carrier, an active substance V2O5 loaded on the TiO2 carrier, an auxiliary agent WO3, and BN / manganese borate particles doped in the catalyst; in the catalyst, the content of V2O5 is 0.2-1%, the content of WO3 is 3-8%, and the content of BN / manganese borate particles is 5-12%. The invention improves the wear resistance, anti-blocking performance and use stability of the catalyst by doping BN / manganese borate particles in the catalyst.
Owner:JIANGSU CTIEC ENVIRONMENTAL PROTECTION RES INST

Liquid chromatography-tandem mass spectrometry method for synchronously detecting related indexes of secondary hypertension in human plasma and application of liquid chromatography-tandem mass spectrometry method

The invention relates to the technical field of medical detection, in particular to a liquid chromatography-tandem mass spectrometry method for synchronously detecting related indexes of secondary hypertension in human plasma and application of the liquid chromatography-tandem mass spectrometry method. The method combines the advantages of sample solid-phase extraction pretreatment, chromatographic separation and mass spectrum high resolution, and the sensitivity and specificity are greatly improved. For a target compound with relatively high content, the signal intensity of the compound in mass spectrometric detection is reduced by reducing collision energy, and combined detection of 10 compounds with large level difference is realized. The clinical detection time is shortened while the clinical sample consumption is reduced, and the personnel cost of a laboratory is reduced.
Owner:PEKING UNION MEDICAL COLLEGE HOSPITAL

Tape casting slurry, green porcelain tape and preparation method thereof

The present invention relates to the technical field of electronic ceramic substrate materials, and more specifically, to a tape casting slurry, a green porcelain tape and a preparation method thereof. The tape casting slurry of the present invention is made of component A, component B and component C, wherein component A comprises: calcium borosilicate glass powder; component B comprises: solvent, binder, plasticizer and dispersant; component C comprises: one or more of acrylic adhesive, alkane mixture, pre-dispersant and auxiliary agent; the mass ratio of component A, component B and component C is 100:(50-150):(0.02-20). The tape casting slurry provided by the present invention has moderate viscosity and good fluidity, and can obtain a green porcelain tape with uniform film thickness and smooth surface.
Owner:LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD

Polyurea-based gel polymer electrolyte, synthetic method thereof and application of polyurea-based gel polymer electrolyte in lithium battery

PendingCN121964828ABreak through design limitationsRealize functional integrationElectrolyte accumulators manufactureElectrolytic agentElectrical battery
The invention discloses a polyurea-based gel polymer electrolyte, a synthesis method thereof and application of the polyurea-based gel polymer electrolyte in a lithium battery, and belongs to the technical field of lithium batteries. A mixture containing a polyureido polyalkenyl monomer, an electrolyte and an initiator is subjected to thermal initiation polymerization reaction to obtain the polyureido gel polymer electrolyte, and the polyureido gel polymer electrolyte integrates ureido functional groups, flame-retardant structural units and coordination polar groups and has a covalent cross-linked network and a dynamic hydrogen bond network at the same time. The composite material shows excellent mechanical properties and ion transmission capability, has intrinsic flame-retardant characteristics, and is especially suitable for preparing high-safety gel-state lithium metal batteries, lithium ion batteries and other electrochemical devices.
Owner:CENT SOUTH UNIV +1

Negative electrode active material particles, negative electrode comprising same, and secondary battery comprising same

The present invention relates to negative electrode active material particles, a negative electrode comprising the negative electrode active material particles, and a secondary battery comprising the negative electrode. Specifically, the negative electrode active material particle is characterized by comprising a core and a coating layer provided on the core, the core comprising a silicon-based particle, and the coating layer comprising a polymer comprising an aromatic cyclic monomer unit having an alkyl group and comprising a heteroatom, thus, side reactions such as hydrogen generation can be prevented during aqueous mixing of the slurry without increasing resistance.
Owner:LG ENERGY SOLUTION LTD

A method for preparing high-purity germanium polycrystal

PendingCN122649091AImprove stabilitylower long-term production costsCarbon coatingPhysical chemistry
The present application relates to the field of germanium polycrystal preparation, and specifically discloses a preparation method of high-purity germanium polycrystal, comprising the following steps: S01, using a mixed solution of up-grade HF and ultrapure water to ultrasonically clean a quartz boat, then using ultrapure water to rinse, blow dry and bake to complete the pretreatment of the quartz boat; S02, using a thin film deposition method to deposit 50-100 nm amorphous silicon on the inner wall of the pretreated quartz boat. The present application uses a quartz boat and an amorphous silicon layer on the inner wall of the quartz boat to replace a graphite boat and a carbon coating, completely eliminates carbon pollution, makes the produced high-purity germanium polycrystal C<0.1 ppt, and performs annealing treatment after depositing the amorphous silicon layer, so that high-temperature annealing can densify the amorphous silicon layer, improve the stability of the silicon layer, inhibit the reaction of Ge and SiO2, and reduce impurities.
Owner:安徽光智科技有限公司

Preparation method of Ti-doped TiB2 metal ceramic coating

The invention discloses a preparation method of a Ti-doped TiB2 metal ceramic coating, and relates to the technical field of metal ceramic coatings, the key points of the technical scheme are as follows: TiB2, Ni, Ti and rare earth La2O3 are subjected to ball milling and mixing, a dispersing agent, a binder and water are added to prepare slurry, powder is dried by a high-speed centrifugal spray dryer, and then microwave sintering is performed to obtain metal ceramic composite powder. Wherein the content of Ni is 16%-26%, the content of Ti is 10%-20%, the adding amount of rare earth La2O3 / CeO2 is 1%-4% of the total mass of the powder, the dispersing agent ammonium polyacrylate is 0.8%-1.2% of the total mass of the powder, and the binding agent polyethylene glycol is 5%-10% of the total mass of the powder. And then plasma or supersonic flame is adopted for spraying, and the wear-resistant coating is formed. And the coating structure is regulated and controlled, and the coating with low brittleness and high fracture toughness is prepared. The Ni3B brittle phase formed in the preparation process of the TiB2-based metal ceramic coating can be controlled to be 10% or below, and meanwhile the fracture toughness is improved by 20%.
Owner:UNIV OF SCI & TECH BEIJING

Distributed optical fiber sensing signal processing method and system

The invention relates to the technical field of optical fiber sensing systems, and discloses a distributed optical fiber sensing signal processing method and system. The method comprises: collecting sensing signals of different events through distributed optical fibers and preprocessing the sensing signals; improving a YOLOv8 model to obtain a target detection model; training the target detection model through normal spatiotemporal data images and abnormal spatiotemporal data images to obtain a trained target detection model; applying the model; replacing a Bottleneck module in a C2F module of the YOLOv8 model with a combination of a fastnet module and an MRFA module, and introducing a deep separable convolution and a multi-receptive field attention mechanism into the improved YOLOv8 model backbone, so as to better utilize the computing power of a device, greatly reduce the computing complexity of network learning, reduce the number of parameters, and improve network efficiency.
Owner:UNIV OF SCI & TECH OF CHINA

High-efficiency production method and application of solder paste battery assembly

The invention relates to a high-efficiency production method and application of a solder paste battery assembly, and belongs to the technical field of photovoltaic batteries. The production method comprises the following steps: raw material preparation and processing pretreatment of the solder paste battery assembly; processing the solder paste raw material to obtain solder paste; coating and printing solder paste on the photovoltaic cell to obtain a solder paste cell; pre-welding treatment, welding treatment and post-welding treatment are conducted; and laminating and packaging to obtain the solder paste battery assembly. According to the invention, the solder paste raw material is treated and the surface is cleaned before coating and printing, so that the solder paste is not easy to fall off after welding, the cooling time after welding is short, the electric connectivity of the welding part is good, the production efficiency of the solder paste battery assembly is improved, the production cost is reduced, and large-scale application in photovoltaic production can be formed.
Owner:QINGHAI HUANGHE HYDROPOWER DEV CO LTD XINING SOLAR POWER BRANCH +3

Epitaxial method for improving crystal point defect on back surface of epitaxial wafer

The invention provides an epitaxial method for improving crystal point defects on the back surface of an epitaxial wafer, and the method mainly comprises the steps: carrying out the epitaxy through employing Poly and LTO in sequence, and carrying out the epitaxy through employing a perforated graphite disc, and obtaining an 8-inch epitaxial wafer. The epitaxial wafer can be used for a power semiconductor device, a photoelectric semiconductor device, a radio frequency and microwave device and a power integrated circuit. The method has the advantages that the perforated graphite disc is used for epitaxy, reaction gas entering the back of the substrate in the epitaxy process can be discharged to the lower part of the reaction chamber along the holes in the surface of the graphite disc, aggregation reaction on the back of the substrate is greatly reduced, and the crystal point defects on the back of the epitaxial wafer are greatly reduced; besides, in the epitaxy process, HCl gas is introduced into the lower end of the graphite plate, the HCl gas enters the back surface of the substrate through holes of the graphite plate to achieve the effect of etching crystal points on the back surface, and meanwhile, the HCl serving as a by-product in the epitaxy process can also achieve the effects of inhibiting the chemical reaction of SiHCl3 and H2 and reducing the generation of crystal point defects on the back surface.
Owner:ANHUI JINGLONG SEMICONDUCTOR TECHNOLOGY CO LTD

Method for improving impact toughness of electric arc additive manufacturing titanium alloy

The invention provides a method for improving impact toughness of electric arc additive manufacturing titanium alloy, and belongs to the technical field of additive manufacturing. The method comprises the steps that a pretreated forming base material is placed on a cooling device in a gas protection device, when the oxygen content in the gas protection device is smaller than 1000 ppm, the electric arc additive manufacturing process of the titanium alloy is started, meanwhile, the cooling device is started to cool the forming base material, the cooling device is placed in the gas protection device, and the cooling device is started to cool the forming base material. According to the method, the cooling device can cool the environment gas in the gas protection device while cooling the base material, printing can be conducted at a low temperature in the whole additive manufacturing process, and compared with an existing additive printing process in which the environment oxygen content needs to be controlled to be 100 ppm or below, due to the fact that the environment is low in the printing process, the printing efficiency is greatly improved. And the temperature of the formed base material is low all the time, so that the printing quality of the titanium alloy can be guaranteed even if printing is conducted under the high oxygen content, and the titanium alloy is not prone to being oxidized.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

A nanoparticle catalyst, a preparation method and application thereof

PendingCN122687252AEfficient electroreduction to produce ammoniaReduce energy consumption
The application discloses a kind of nanoparticle catalyst and its preparation method, application, belong to catalyst field.The chemical formula of the catalyst is MCu4 (M is one of Ir, Pt, Pd), wherein the atomic ratio of noble metal and copper is 1:4.The nanoparticle catalyst is based on MCu4 Alloy nanoparticle catalyst, can realize the direct production of ammonia under the condition of lower theoretical voltage 1.23V.The catalyst has double function, can effectively promote nitrate reduction reaction (NO3RR), and the faraday efficiency in electrolysis process is as high as 93.6%.
Owner:THE CHINESE UNIV OF HONG KONG (SHENZHEN)

Semi-supervised space-time action detection method, device and equipment based on semantic causal pseudo-mark uncertainty constraint and storage medium

The invention discloses a semi-supervised space-time action detection method, device and equipment based on semantic causal pseudo-mark uncertainty constraint and a storage medium. The method comprises the following steps: firstly, sampling a video to generate a fragment set, and extracting a target bounding box, a target-level spatial-temporal feature and a neighborhood background region feature through a two-dimensional and three-dimensional convolutional neural network; the target-level spatial-temporal features are enhanced through a semantic causal context enhancement module, and an enhanced target-level spatial-temporal feature set is output; unmarked samples are screened through an unmarked sample selection module with uncertainty constraint, and a reliable sample set is output; a pseudo mark calibration module calibrates a pseudo mark and outputs a high-quality pseudo mark set; and finally, outputting an action category probability set by the student model. According to the method, background features can be adaptively weakened, dynamic interference backgrounds can be inhibited, unmarked data can be fully utilized when marked data is limited, the action semantic discrimination capability is enhanced, the data marking cost is reduced, and the problem of balance between the detection efficiency and the cost under the limited marked data is effectively solved.
Owner:HANGZHOU DIANZI UNIV