67results about How to "Reduce rate" patented technology

The invention aims to provide a heat treatment method for reducing quenching stress and improving low-temperature toughness of a Cr-Ni-Mo-V steel forging, and belongs to the technical field of metal material heat treatment. The method comprises the following steps: (1) carrying out isothermal annealing heat treatment on the Cr-Ni-Mo-V steel forging; (2) carrying out normalizing heat treatment on the isothermal annealing forge piece; (3) carrying out tempering heat treatment on the normalized forge piece; (4) the tempered forge piece is subjected to step quenching treatment; and (5) carrying out rapid tempering treatment on the quenched forge piece. By means of the heat treatment method, the surface quenching residual stress of the Cr-Ni-Mo-V steel forge piece can be reduced by 30% or above, meanwhile, the strength and low-temperature impact energy of the Cr-Ni-Mo-V steel forge piece are improved by 10% or above, and the safety and reliability of the Cr-Ni-Mo-V steel forge piece are improved.

According to the navigation and communication signal integration method provided by the invention, aiming at a conduction integration signal system application scene, the positioning precision and the anti-multipath capability are selected as evaluation indexes, and the navigation and communication integration signal precision and performance are analyzed and evaluated based on the performance theoretical limit. By combining the characteristics of a communication signal and a navigation signal, taking compatibility of the communication signal and the navigation signal as a starting point and adopting a burst multicarrier modulation mode, a navigation signal, namely a burst multicarrier signal (BCC signal) which can be broadcasted in a time slot of a communication channel and is compatible with multiple communication systems is constructed. Mi subcarriers are modulated on a single frequency point of a signal source i, the frequency interval between the subcarriers is fixed, the signal duration is adjustable, the subcarriers have burst characteristics, each subcarrier is modulated with the same pseudo code, meanwhile, the signal power of each subcarrier can be adjusted according to needs, and finally, the signals of the Mi subcarriers are combined together and transmitted out. Different pseudo codes are used for representing different signal sources.

The invention provides a semiconductor process method. The semiconductor process method comprises the following steps: sequentially forming a hard mask layer and a patterned photoresist layer on a layer to be etched; taking the patterned photoresist layer as a mask, and etching the hard mask layer by adopting a dry etching process to form a groove for exposing the layer to be etched; wherein in the dry etching, a silicon coating is arranged in a reaction chamber, direct current voltage is applied to the silicon coating, the silicon coating is reverse voltage, and the silicon coating is bombarded by plasma to release silicon which is attached to the upper surface of the patterned photoresist layer to form a protective layer so as to protect the patterned photoresist layer. Through the arrangement of the direct-current silicon coating, the protective layer is formed on the patterned photoresist layer to protect the patterned photoresist layer, the patterned photoresist layer is prevented from being damaged in dry etching, and meanwhile, the patterned photoresist layer is modified and hardened, so that the consumption of high-energy bombardment on the vertex angle of the patterned photoresist layer can be resisted, and the service life of the patterned photoresist layer is prolonged. And generation of stripes on the side wall of the groove is avoided.

An antibody that can specifically bind to semenogelin-1 (SEMG1) and semenogelin-2 (SEMG2) and regulate the binding of said proteins with a receptor (LILRB2, LILRB4, CD27, or TIGIT) thereof. It is proven that SEMG1 and SEMG2 have a regulating effect on immune cells, and it is proven that the antibody has a neutralizing effect. A specific linear epitope located on SEMG1 and SEMG2 proteins is provided, and it is proven that an antibody recognizing said epitope has a stronger neutralizing function, can more effectively remove an immunosuppressive effect mediated by SEMG1 and SEMG2, and promotes immune cells to inhibit and kill tumor cells. Further provided are preparation and identification methods for the antibody as well as a biomarker for the administration of such antibody. The present invention has good application prospects in the aspect of preparation of an anti-tumor drug.

Disclosed are a hybrid dialkylphosphinic acid salt, and a preparation method therefor and an application thereof. The hybrid dialkylphosphinic acid salt is at least one of compounds represented by Formula (I). The hybrid dialkylphosphinic acid salt of Formula (I) provided herein features a low required loading level, high flame retardant efficiency for various polymers, and high economic efficiency. The present invention overcomes the disadvantage of low flame retardant efficiency of diethylphosphinate in polymers as well as high volatility and low flame retardant efficiency for polyesters of diisobutylphosphinate. The hybrid dialkylphosphinate salt of Formula (I) can be widely applied to flame retardant polymers which require high-temperature processing.

The present invention belongs to the technical field of clothing manufacturing equipment, and in particular to a dust removal device for textile machinery and a method of using the same, comprising a clothing manufacturing machine, a top plate fixed on the upper surface of the clothing manufacturing machine, and a dust cover screwed to the surface of the top plate, the surface of the top plate being screwed to a dust removal fan, and the interior of the dust cover being provided with a dust removal mechanism. The device is provided with a dust removal mechanism, and can intercept and filter the generated cotton wool and fine fibers as well as dust in the air, thereby greatly improving the working environment and reducing the dust content in the air. The device can automatically clean the surface of the dust filter element to ensure the filtering effect of the dust filter element, and avoid dust backflowing back into the work workshop to cause pollution to the working environment, thereby creating a cleaner, healthier and more comfortable working environment for workers, helping to improve the work enthusiasm and work efficiency of workers, and reducing health problems such as respiratory diseases caused by dust.

The invention provides an electric auxiliary turbocharger with a double filtering system, and relates to the technical field of electric auxiliary turbochargers, the electric auxiliary turbocharger comprises a gas compressor, a gas compressor gas inlet and a gas compressor gas outlet are formed in the gas compressor, a conical barrel is further arranged on the gas compressor, a gas inlet is formed in the side wall of the top of the conical barrel, and a gas outlet is formed in the side wall of the top of the conical barrel. The air inlet is tangent to the conical barrel, a connecting barrel is rotationally connected to the center of the top of the conical barrel, a rotating barrel with air permeation holes is arranged in the center of the interior of the conical barrel, rotating barrel blades are arranged on the side wall of the periphery of the rotating barrel, and the top of the rotating barrel is fixedly connected with the bottom of the connecting barrel; the top of the connecting cylinder is rotationally connected with the air inlet end of the air filter, double filtering devices are arranged, namely, a set of filtering devices are additionally arranged in front of the air filter, so that the filtering effect on pollution such as dust in air is improved, and the situation that the air filter is blocked, and the air inlet amount is affected is avoided.

Embodiments include, in response to monitoring the processor during operation, detecting a first amount of throttling amount in the processor, determining that the first amount of throttling amount satisfies a first condition with respect to a throttling amount threshold, and modifying a voltage level of the processor by a first amount. Embodiments include, in response to modifying the voltage level of the processor by the first amount, detecting a second amount of throttling amount in the processor, determining that the second amount of throttling amount satisfies a second condition with respect to a throttling amount threshold, and modifying the voltage level of the processor by the second amount.

The present invention comprises: a first tray for forming a portion of an ice-making cell; a second tray forming the other portion of the ice-making cell, and capable of moving relative to the first tray; an ice bin for storing ice separated from the first and second trays; and a full-ice sensing lever for moving together with the second tray in a predetermined range.

A cutting blade wear determination device (31) of a sheet processing device includes a cutting controller (33), a cutting trace extractor (34), and a determiner (35). The cutting controller (33), by causing a lifting mechanism capable of moving a cutting blade in a direction intersecting a sheet placed on a table and a parallel movement mechanism capable of moving the cutting blade in parallel with a surface of the table while the cutting blade is brought into contact with the table to operate, instructs formation of a cutting surface in a sheet placed on the table. The cutting trace extractor (34) acquires an image captured by imaging, by a camera (21), a portion of the back surface of a sheet where formation of a cutting surface is instructed and extracts, from the image, a cutting trace that is a line at which the formed cutting surface intersects the sheet back surface. When an assumed line that is a line at which a cutting surface assumed to be formed in the sheet by the cutting blade intersects the sheet back surface does not coincide with a cutting trace extracted by the cutting trace extractor (34), the determiner (35) determines that the cutting blade instructed to form the cutting surface is worn.

The present invention provides an antenna structure, including a frame body, a first feed-in part, and a first connection part, where the frame body is at least partially made of a metal material, the frame body includes at least a first part and a second part, the second part is connected to one end of the first part, a length of the second part is greater than a length of the first part, a first slot is provided in the first part, a second slot is provided in the second part, a part of the frame body between the first slot and the second slot forms a first radiation part, the first feed-in part is disposed on the first radiation part and located on the first part of the frame body, the first feed-in part is electrically connected to a first feed to feed a current signal into the first radiation part, and the first connection part is disposed on the first radiation part and located on the second part of the frame body. The antenna structure can effectively improve low band (LB) radiation performance. The present invention further provides an electronic device having the antenna structure.

This application provides a data transmission method, a network interface card (NIC) for a data receiving end, an electronic device, and a storage medium. The data transmission method is applied to the NIC of the data receiving end. The NIC writes data to the host memory of the data receiving end via a bus. The data transmission method includes: if the bus bandwidth resources required for the NIC to write the target data to the host memory exceed the bus bandwidth resources available to the NIC, then writing a portion of the target data to the NIC's NIC buffer; the NIC buffer includes a first memory buffer configured for the NIC based on its on-chip memory and a second memory buffer configured for the NIC based on its onboard memory; the data sending end sends the target data to the data receiving end via remote direct memory access; and a portion of the data is written from the NIC buffer to the host memory. The solution of this application can better avoid data packet loss problems when facing sudden traffic surges.

The application discloses a V micro-alloyed ultra-high-strength Al-Mg-Si-Cu alloy and a preparation method thereof. The components of the alloy are as follows in percentage by mass: Mg: 1.2-2.0 wt.%, Si: 1.0-1.5 wt.%, Cu: 0.5-1.5 wt.%, Zn: 0.1-0.5 wt.%, Mn: 0.2-0.4 wt.%, V: 0.05-0.4 wt.%, and Fe: less than or equal to 0.2 wt.%. The rest includes Al and inevitable impurities. The preparation process comprises the following steps: smelting, homogenization treatment, rolling and solid solution aging treatment. By synergistically optimizing the content of main alloying elements and introducing V micro-alloying, the mechanical properties of the 6xxx series aluminum alloy plate are broken through, the yield strength is greater than or equal to 370 MPa, the tensile strength is greater than or equal to 420 MPa, and the elongation is greater than or equal to 14%. The alloy plate has the advantages of ultra-high strength, excellent plasticity and low alloy cost, and meets the demand of the transportation field lightweight design for the ultra-high-strength aluminum alloy plate.

The invention relates to the technical field of polymethyl methacrylate, and discloses a flame-retardant polymethyl methacrylate material and a preparation method thereof.The flame-retardant polymethyl methacrylate material is obtained by reacting polymethyl methacrylate, a hydroxyl-terminated flame retardant and p-toluenesulfonic acid. The linear polymethyl methacrylate is crosslinked into a three-dimensional network structure, so that the crosslinking degree between molecular chains is enhanced, the molecular chains are not easy to slip under stress, good structural stability is maintained, and the polymethyl methacrylate has high tensile strength and bending strength. The flame retardant contains piperazine rings and phosphate structures, forms an intumescent flame-retardant system, generates phosphoric acid substances, nitrogen and other gases during combustion, promotes dehydration of a matrix to form an intumescent carbon layer, isolates oxygen, prevents heat conduction, inhibits the combustion process, remarkably reduces the peak value of the heat release rate and the total heat release amount, and has excellent flame-retardant performance.

This invention discloses a self-healing, anti-corrosion, and cooling coating and its preparation method. The preparation method includes: TiO2 surface activation treatment; in-situ construction of a mesoporous silica shell and loading of a corrosion inhibitor; surface silane modification; and coating and curing after blending the obtained filler with resin and curing agent. The coating consists of a polymer resin matrix and a multifunctional core-shell nanocomposite material uniformly dispersed therein; the composite material has a three-level structure of core-shell-interface layer: titanium dioxide as the core, mesoporous silica loaded with corrosion inhibitor as the functional shell, and a silane coupling agent as the interfacial compatibility layer. Through multi-level structural design, this invention enables a single filler to simultaneously achieve high solar reflectance, high infrared emission, and intelligent release of corrosion inhibitors. The coating combines a physical barrier, active corrosion prevention, and radiation cooling triple protection mechanism, and can be widely used for long-term protection of outdoor metal or non-metal substrates.

Disclosed herein are a Mn-Zn ferrite material and a preparation method therefor. The Mn-Zn ferrite material comprises a main component and an auxiliary component; the main component comprises Fe2O3, ZnO and MnO; the auxiliary component comprises CaCO3, Bi2O3 and CoO; on the basis of the total weight of the main component, the content of CoO is 1000-5000 ppm. The preparation method comprises: (1) mixing each member of the main component, then pre-firing, and obtaining a pre-fired mixture; (2) adding each member of the auxiliary component to the pre-fired mixture, and mixing to obtain a ferrite slurry; (3) granulating the ferrite slurry, and pressing and forming after granulation to obtain a manganese-zinc ferrite blank, and (4) sintering and cooling the manganese-zinc ferrite blank to obtain the Mn-Zn ferrite material. The Mn-Zn ferrite material provided in the present application is a material having high magnetic permeability and a low temperature coefficient.

A cathode material, its preparation method, a cathode sheet, and a secondary battery are disclosed. The cathode material includes a core and a buffer layer. The core contains a first lithium manganese iron phosphate doped with a metal element. The buffer layer covers the outer surface of the core and contains a second lithium manganese iron phosphate. Along the thickness direction of the buffer layer, the iron-manganese ratio near the core is smaller than that far from the core. This cathode material can solve the problem that existing lithium manganese iron phosphate exhibits a dual-voltage plateau characteristic during charge and discharge, affecting the accuracy of charge state estimation.

The invention belongs to the field of functional fibers, and particularly relates to a deodorizing and identifiable regenerated cellulose fiber and a preparation method thereof.The deodorizing and identifiable regenerated cellulose fiber is prepared by preparing a TiO2 / g-C3N4 nano composite material, selecting proper carbon dots to modify the TiO2 / g-C3N4 nano composite material and adjusting components of a coagulating bath through a pre-spinning blending technology. And preparing the regenerated cellulose fiber with a broad-spectrum light-catalyzed deodorization function by adopting wet spinning. The absorption peak value of an ultraviolet region of the regenerated cellulose fiber prepared by the method is 340nm, and the absorption characteristic peak value of a visible region is 435nm; the removal reduction rate of ammonia gas is not less than 85%, the removal reduction rate of acetic acid is not less than 90%, and the removal reduction rate of isovaleric acid is not less than 90% According to the present invention, the fiber has the excellent mechanical property, the fiber fineness is 1.11-2.78 dtex, the dry breaking strength is 2.7-3.0 cN / dtex, and the wet breaking strength is 1.7-2.0 cN / dtex; the washable effect is good, the deodorization effect is basically unchanged after 50 times of washing, and the reduction rates of ammonia gas, acetic acid and isovaleric acid are all reduced by 3% or below.

The invention belongs to the field of agricultural fertilizers, and provides a micro-mineral activator and an application thereof in improving the fertilizer efficiency of a bio-organic fertilizer. According to the invention, epoxy silane coupling modified potassium feldspar powder is adopted as a core to construct a two-phase collaborative design of humic acid coated core-shell composite powder IM-X and metal ion crosslinked microgel powder IM-Y; the balance between the compressive strength of the particles and the rapid disintegration and dispersion performance when encountering water is realized, the consideration of a high-solid-content low-water-adding-amount granulation process window and the rheological stability of a humic acid cross-linked network is considered, and the unification of moisture absorption and caking resistance during storage and transportation and water absorption and retention ion response regulation and control functions after application is realized; the mineral-organic composite additive solves the performance coupling contradiction of natural conflicts in physical and chemical mechanisms of the existing mineral-organic composite additive, has the advantages of good processing controllability, excellent storage and transportation stability and remarkable fertilizer efficiency improvement effect, and has wide application value in the field of bio-organic fertilizer synergism.

The application discloses a needle-tooth shell assembly and a speed reducer, and solves the problem of high difficulty in needle selection and the problem of speed reducer failure caused by needle-tooth groove wear in the prior art. The needle-tooth shell assembly comprises a needle-tooth shell and a needle-tooth sleeve. The needle-tooth sleeve is arranged to be movable on the needle-tooth shell, so that the position of the needle-tooth groove on the needle-tooth sleeve for cooperating with the needle can be adjusted, and the diameter of the needle-tooth shell is adjusted, so that the needle-tooth groove can be adapted according to the selection of the needle, the problem that the needle engagement top gap is too different from the theory due to the error in the diameter screening of the needle in the prior art is solved, the purpose of weakening the adverse effect of the large diameter fluctuation of the needle on the service life of the speed reducer is achieved, the assembly precision of the speed reducer and the service life of the speed reducer are improved, the purpose of reducing the idle stroke of the speed reducer and the attenuation rate of the stiffness curve is achieved, and the service life of the speed reducer is improved.

The proposed method relates to the field of non-ferrous metallurgy. The method for processing bauxites to produce alumina, said method comprising: filtering an alumina process slurry obtained after a digestion of the bauxites, wherein the slurry, after leaching, dilution or thickening, is filtered at a temperature of at least 95 °C to obtain a filtrate representing a green liquor after the filtration and a solid phase of a red mud, washing the solid phase of the red mud on filtration equipment, wherein the washing is carried out with hot water, preferably at a temperature of below 98 °C, to achieve specified concentrations of the green liquor and a liquid phase of the red mud, where the filtrate is directed to security filtration and / or precipitation, and the water after washing the red mud is fed for the dilution of the slurry after the digestion of the bauxites and / or the dilution of the filtrate to obtain a specified concentration of the green liquor, wherein a resulting cake is a waste product. The method results in enhancing liquor productivity at precipitation and reducing the consumption of soda, therefore, the efficiency of alumina production improves due to the saving of soda, heat and energy resources, and the production of smelter-grade alumina increases.

The invention provides an anion exchange membrane electrolyzed water cathode electrode and a preparation method thereof. The anion exchange membrane electrolyzed water cathode electrode comprises a carbon fiber substrate and cathode catalyst slurry cured on the surface of the carbon fiber substrate, and the cathode catalyst slurry comprises the following components in parts by mass: 20 parts of an anion ionomer, 10 parts of a catalyst, 5-9 parts of a 5% binder solution and 250-300 parts of a solvent; wherein a binder in the 5% binder solution is selected from at least one of polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polyvinyl alcohol and polyvinylpyrrolidone. The high-molecular binder and the anion ionomer are introduced to form a composite network, the binding force between the catalyst layer and the porous transmission layer is improved, the attenuation rate is low, the stability is high, and the problems of stripping and pulverization of the catalyst layer under the working conditions of strong alkalinity and high gas-liquid flow rate can be effectively solved.

The invention is suitable for the technical field of aero-engines, and provides a venturi tube structure, a swirler and a combustion chamber, the venturi tube structure comprises a venturi tube outer layer and a venturi tube inner layer, the venturi tube outer layer is provided with a containing cavity, a plurality of first protrusions are arranged on one side of the venturi tube inner layer in the circumferential direction at intervals, and a plurality of second protrusions are arranged on the other side of the venturi tube inner layer in the circumferential direction at intervals; the venturi tube inner layer is embedded in the containing cavity, the multiple first protrusions abut against the inner wall of the containing cavity so that a first cavity can be formed between the venturi tube outer layer and the venturi tube inner layer, and the multiple second protrusions abut against the inner wall of the containing cavity so that a second cavity can be formed between the venturi tube outer layer and the venturi tube inner layer; the first cavity and the second cavity are mutually independent and are used for preventing high temperature from being directly transmitted to the inner layer of the venturi tube. By means of the core structure design of the double-layer tube body and the independent cavities, the first cavity and the second cavity which are independent of each other are formed between the two tubes, direct conduction of high temperature from the outer layer of the venturi tube to the inner layer of the venturi tube is blocked by means of the air heat insulation characteristic, and the carbon deposition restraining effect is remarkable.

This utility model discloses a portable desalination device for metallic artifacts, belonging to the field of cultural relic protection technology. It includes a mobile frame with casters fixed to the bottom via spring shock absorbers. A desalination assembly is located on the top of the frame, comprising a desalination chamber, a lid, partition grooves, partition plates, threaded grooves, several connecting rods, and clamps. The desalination assembly, with its cross-shaped partition grooves and snap-fit ​​partition plates within the desalination chamber, allows for flexible adjustment of the internal space dimensions, adapting to metallic artifacts of different sizes and volumes, significantly improving the device's adaptability. Furthermore, the connecting rods mounted via the threaded grooves flexibly secure the clamps and a waterproof camera. The monitoring sensor probe within the clamps can acquire multi-dimensional data at different depths of the solution in real time, while the waterproof camera simultaneously records the artifact's condition, eliminating reliance on manual sampling and enriching parameter monitoring methods.

The application discloses a high-strength and high-toughness Al-Ca-In series aluminum alloy low-oxygen spherical powder for additive manufacturing and a preparation method thereof, relates to the technical field of additive manufacturing powder, and comprises the following components in percentage by mass: 1.5-3.0% of magnesium, 0.15-0.60% of manganese, 1.0-2.0% of calcium, 0.06-0.25% of indium, 0.08-0.18% of zirconium and 0-0.05% of titanium, and the balance of aluminum and impurities, wherein the total oxygen is not more than 0.10%; the powder surface has a nitrogen-containing diffusion barrier layer with a thickness of 2-8 nanometers and an ultrathin oxide layer with a thickness of 0.5-2.0 nanometers in sequence, and the surface enrichment and interface capture indexes are limited; and the powder is prepared by high-temperature dissolution of manganese and zirconium, low-temperature segmented calcium addition, nitrogen-containing gas atomization and low-temperature micro-oxidation. The powder inhibits the surface migration and oxidation loss of calcium and indium, improves the component stability in recycling and forming, reduces defects and performance dispersion, and is suitable for the high-strength and high-toughness manufacturing consistency of thin-wall lattice load-bearing parts.

The atomization assembly comprises an atomization main body and a heating piece, the atomization main body is provided with an atomization channel and an air inlet channel, the atomization main body comprises a first barrel and a second barrel which are arranged in the radial direction of the atomization channel, the air inlet channel is located between the first barrel and the second barrel, the first barrel is provided with a first partition plate, and the second barrel is provided with a second partition plate; a first channel is formed between the first partition plate and the second barrel, the second barrel is provided with a second partition plate, a second channel is formed between the second partition plate and the first barrel, the first channel is communicated with the second channel, and the first channel and the second channel are arranged in a staggered mode in the radial direction and / or the circumferential direction of the atomization channel. When the backflow aerosol passes through the air inlet channel, baffling in the radial direction and / or the circumferential direction can be generated under blocking of the first partition plate and the second partition plate, so that the backflow rate and the backflow amount of the aerosol can be reduced, and the influence on the use experience of a user due to the fact that the aerosol is subjected to backflow condensation and gathered in the air inlet channel or the air inlet is reduced.

The application relates to the technical field of battery optimization, and particularly discloses a storage battery operation optimization method and system based on peak-valley electricity, which comprises the following steps: constructing a multi-dimensional operation characteristic matrix of a target power supply system; performing trend correlation analysis on the multi-dimensional operation characteristic matrix to establish a dynamic mapping mechanism of a peak-valley electricity price period and a storage battery state of charge interval, and obtaining a charging and discharging strategy mode; taking minimization of electricity cost as an optimization target and a battery attenuation rate as a constraint condition, performing multi-target collaborative deduction on the charging and discharging strategy mode to obtain an optimal charging and discharging power curve of the storage battery and a corresponding time period window, generating a charging and discharging control instruction of the storage battery, and delivering the charging and discharging control instruction to a storage battery energy management system; and correcting mapping parameters of the dynamic mapping mechanism according to an actual state of charge feedback value of the storage battery energy management system; and the application can improve the operation optimization efficiency of the storage battery.

The present invention belongs to the technical field of catalytic cracking, and relates to a metal pollution-resistant catalyst, its preparation and application. The catalyst consists of a first alumina comprising a modified metal Mn and a second alumina. The ratio of the integral areas of the two peaks at 3670 cm-1 and 3730 cm-1 in the infrared spectroscopy of the catalyst is 1-5:1. The method for preparing the catalyst comprises a step of forming a slurry of an acid-soluble first alumina, a non-acid-soluble second alumina, water and optionally acid and a modified metal oxide. The metal pollution-resistant catalyst and the particle containing a catalytic cracking active component form a catalytic cracking catalyst, useful for catalytic cracking of hydrocarbon oil containing pollution metals. In the case of nickel pollution, catalytic cracking of hydrocarbon oil can reduce the ratio of hydrogen to methane.

An object of the present invention is to provide a composite particle that can achieve both a high silicon utilization rate and suppression of oxidation during water dispersion. A composite particle of the present invention is a composite particle including a particle including a carbon material and silicon, and a coating layer including carbon and oxygen on the surface of the particle, in which the composite particle has a true density of 1.80 to 1.99 g / cm3; in the Raman spectrum, a peak is present at 450 to 495 cm-1, and when the intensity of the peak is defined as ISi and the intensity of the G band is defined as IG, ISi / IG is 1.3 or less; and when the ratios of the number of atoms of Si, O, and C in X-ray photoelectron spectroscopy are defined as ASi, AO, and AC, respectively, and the ratios of SiO2 and SiO are defined as BSiO2 and BSiO, respectively, ASi is 0.05 or more, and ISi / IG and Ac / (Ac + ASi × (BSiO2 + BSiO)) have predetermined relationships.

The invention relates to an optical element testing system, in particular to an optical element performance testing system and method based on ultralow-temperature high-vacuum coupling, and aims to solve the problem that an existing testing system cannot test the performance of an optical element while simulating an ultralow-temperature and ultrahigh-vacuum sequential coupling environment. Precision testing equipment is protected, and all-parameter and multi-attitude stable and accurate testing of the optical element is achieved. The system comprises a testing container and a tested container which are communicated with each other, and a high-reflectivity one-way film evaporation container is arranged in the testing container and used for slowing down temperature and pressure sudden change during vacuumizing so as to protect internal testing equipment; a contact type optical element clamping cold box is arranged in the tested container, is connected with the optical element through a flexible cold chain, and is matched with a liquid nitrogen / gas nitrogen system to realize proportional temperature regulation. The device can safely and truly simulate the extreme environment of a spaceflight deep space, and achieves the stable and accurate testing of all parameters and multiple attitudes of the optical element.