30results about How to "Controllable density" patented technology

The invention discloses a preparation method of a cadmium selenide or cadmium sulfide two-dimensional monocrystal nanosheet. The method comprises the steps that the CdSe or CdS two-dimensional monocrystal nanosheet is prepared through a van der Waals epitaxial growth technology, the method is characterized in that a mica sheet which is smooth in surface and free of chemical dangling bond is adopted to serve as a substrate, CdCl2 powder or Se powder or S powder serves as a source material, argon serves as carrier gas, CdCl2 stream is reacted with Se or S steam to form CdSe or CdS steam at high temperature, and the steam is deposited on the mica sheet for nucleation and epitaxially grows into the CdSe or CdS two-dimensional monocrystal nanosheet. The preparation method of the cadmium selenide or cadmium sulfide two-dimensional monocrystal nanosheet is easy to operate, low in cost and strong in controllability, the obtained CdSe or CdS has the advantages of being good in size uniformity, high in degree of crystallinity and the like, and important research value and wide application prospect in the fields of solar cells, field effect transistors, photoelectric detectors, photocatalyses and the like are achieved.

This invention discloses a method for manufacturing high heat-conductive graphite foam material. The method comprises: (1) heating asphalt in a reactor at 1-5 deg.C/min to 260-400 deg.C; (2) pressurizing to 2-6 MPa; (3) heating at 1-2 deg.C/min to 350-550 deg.C; (4) keeping the temperature for 15-120 min, and discharging the gas to obtain asphalt foam material; (5) heating to 950-1100 deg.C under nitrogen protection to obtain carbonized asphalt foam material; (6) heating to 2600-3000 deg.C under nitrogen protection for carbonization, and cooling naturally to obtain high heat-conductive graphite foam material. The pore sizes are 80-800 mum, the density is 0.28-0.75 g/cu cm, the porosity is 55-85%, and the heat conductivity is 68-140 W/mK. The high heat-conductive graphite foam material can be widely used in radiator, heat exchanger, automobile, airplane brake block, catalyst carrier, gas adsorbent and composite material.

The invention discloses a remote sensing satellite multispectral image registration method. The remote sensing satellite multispectral image registration method comprises the following steps that 1, a rough registration image is obtained according to the distance of a multispectral detector; 2, histogram projection is carried out on an image to be registered on the basis of a reference image; 3, the two images are partitioned in blocks, and for each pair of image blocks, angular points of each pair of image blocks are extracted, and in order to realize registration of a near infrared image, the main direction phase coincidence characteristic of each block is extracted, and a positive and negative sub pixel matching point set of each block is obtained on the basis of phase correlation and surface fitting; 4, triangular grid partition is carried out on the reference image and the image to be registered, a transformation coefficient is worked out, and resampling is carried out on the image to be registered to obtain a registered image. Compared with the prior art, the method solves the problem that as the gray difference of features of different reflectivities on different spectral sections is large, registration is difficult, and also effectively solves the problem that large remote sensing images in different areas distort to different extents.

The invention provides a readily-foaming emulsifying agent. The readily-foaming emulsifying agent consists of the following components in percentage by weight: 60 to 40 percent of surfactant and 40 to 60 percent of wetting and stabilizing agent, wherein the surfactant at least comprises S-80 with high hydroxyl value. The main components and compounded products of the emulsifying agent are dissolved into oil easily; and the emulsifying agent is emulsified with aqueous solution of ammonium nitrate inorganic salt to form a latex matrix, and after the latex matrix is added into aqueous solution of sodium nitrite, bubbles are generated to sensitize the latex matrix into emulsion explosive.

The invention relates to a preparation method of a molybdenum trioxide nanorod. An alpha-MoO3 nanorod in oriented growth is excellent in field electron emission performance and relatively low in threshold electric field, and can be widely applied to field emission display apparatuses, super-capacitors, electrochemical energy storage device and the like. By utilizing a two-step spreading pulsed laser deposition technology, based on alpha-MoO3 as a target material, the alpha-MoO3 nanorod in an orthorhombic system is deposited on a silicon substrate, wherein the deposited alpha-MoO3 nanorod is high in density and less in diameter. The method comprises the following steps of: firstly, depositing a thinner MoO3 seed crystal layer on a substrate ablated by a conventional pulse laser; then reversing the sample; and further growing a uniform MoO3 nanorod on the seed crystal layer through a spreading pulsed laser deposition method. According to the preparation method provided by the invention, a single crystal MoO3 nanorod array which is high in degree of crystallinity and low in defect density can be prepared without a catalyst, and the preparation process is simple, easy to control, good in repeatability and environmental-friendly.

The invention provides a method for preparing simple and controllable nanoscale silver-loaded monox. The method comprises the specific steps that (1) monodispersed spherical nanometer SiO<2> particles are prepared through a Stober method; (2) a reducibility group is decorated on the surface of a nanometer SiO<2> sphere; (3) silver particles with the diameter of 1-3 nm are reduced on the surface of the nanometer SiO<2> sphere. The obtained silver-loaded monox is regular in form and even in particle size, and the particle size and density of the silver particles on the surface of the silver-loaded monox can be regulated and controlled easily; the overall preparation technology is easy and feasible, a product system is stable, and the industrial preparation potential is achieved.

The invention relates to the technical field of high polymer materials, in particular to micro-foamed water-based damping coating and a preparation method thereof and aims to solve the problem that the size and the density of cells of the damping coating in the prior art are difficult to control. To solve the problem, the micro-foamed water-based damping coating is prepared from a water-based emulsion serving as a main agent, damping filler serving as main filler, organic filler serving as auxiliary filler as well as a proper amount of a crosslinking agent, a catalyst, a gas foaming agent and water; specifically, the micro-foamed water-based damping coating is prepared from raw materials by weight as follows: 10-60 parts of the water-based emulsion, 20-80 parts of the damping filler, 0.5-10 parts of the organic filler, 10-50 parts of the crosslinking agent, 0.01-2 parts of the catalyst and 5-30 parts of water, wherein the temperature of the gas foaming agent ranges from 220 DEG C to 250 DEG C, and the pressure of the gas foaming agent ranges from 8 Mpa to 10 Mpa. Besides, the invention further provides a method for preparing the micro-foamed water-based damping coating. The size and density of cells of the damping coating can be controlled effectively after the coating is foamed through the gas foaming agent.

The invention discloses a preparation method of a vanadium dioxide nano rodlike thin film. The preparation method of the vanadium dioxide nano rodlike thin film comprises the following steps: firstly preparing clarified electrolyte containing a tetravalent compound, then carrying out electrochemical deposition coating; finally annealing at the temperature of 100-800 DEG C in a reducing atmosphere. The thin film obtained by adopting the preparation method is of a nano rodlike structure with a regular and uniform morphology, has high surface activity, can be applied to a thin film material which is formed through deposition on the surface of a base plate in one step and has thermochromic property and also can be applied to the fields of energy storage materials like a cathode electrode; besides, the preparation method of the vanadium dioxide nano rodlike thin film is simple in technology, mild in reaction conditions and applicable to substrate base plates with different morphologies and specifications, a film-forming speed is high, morphology and thickness of the thin film are controllable, compactness is good, and the preparation method of the vanadium dioxide nano rodlike thin film is applicable to large-scale popularization and application.

The invention discloses a method for manufacturing a patterned substrate. The method comprises the followings steps of: providing a substrate; depositing an indium tin oxide thin film on the substrate; carrying out wet-method etching on the indium tin oxide thin film by using an indium tin oxide corrosion solution, so as to form a discontinuous indium tin oxide thin film on the surface of the substrate; taking the discontinuous indium tin oxide thin film as a mask and etching the substrate by a dry method to form a concave-convex substrate surface; utilizing the indium tin oxide corrosion solution to remove the residual discontinuous indium tin oxide thin film from the substrate to form the patterned substrate. The method for manufacturing the patterned substrate, disclosed by the invention, has the advantages of high production efficiency and low cost and is suitable for manufacturing of the small patterned substrate.

The invention discloses a carbon nanotube foam material with electromagnetic shielding performance, and a preparation method and application thereof. The preparation method of the carbon nanotube foammaterial with the electromagnetic shielding performance comprises the following steps: placing carbon nanotube foam into a reaction chamber of chemical vapor deposition equipment; and heating the reaction chamber to 1000-1100 DEG C, and then at least introducing a carbon source and a reducing gas into the reaction chamber, so as to carry out secondary deposition of amorphous carbon on the carbonnanotube foam, thereby obtaining the carbon nanotube foam material with the electromagnetic shielding performance, wherein the carbon nanotube foam material comprises a porous structure composed of a3D network structure with self-supporting capability. According to the invention, the prepared carbon nanotube foam material with the electromagnetic shielding performance has excellent shielding effectiveness, controllable density and thickness, small mass, good flexibility and excellent shielding effectiveness stability; and the preparation process is simple, and batch production can be expanded.

The invention discloses a solvent-resistant composite nanofiltration membrane and a preparation method thereof, and belongs to the field of organic composite materials. The solvent-resistant compositenanofiltration membrane is composed of a poly-p-phenylene terephthamide short chain segment and polyarylethersulfone containing an amino branched structure. The preparation method comprises the following three steps: dissolving the poly (p-phenylene terephthamide) nanofiber, synthesizing amino branched structure-containing polyarylethersulfone and preparing the solvent-resistant composite nanofiltration membrane. The membrane prepared by the method has a high-flux transmission channel, good chemical stability and solvent resistance.

The invention discloses a method for constructing a tartaric acid coating layer with a corrosion protection function on the surface of magnesium metal. The method comprises the following steps: A. polishing and carrying out ultrasonic cleaning on a pickling solution; B. soaking the magnesium metal obtained in the step A in NaOH solution with a concentration of 3mol/L, placing the NaOH solution in a water bath environment at 50-70 DEG C, standing for 11-14h, carrying out alkaline activation pre-treatment, then thoroughly washing the magnesium metal, and then drying the magnesium metal; C. preparing a tartaric acid solution with a concentration of 5-25g/L, and adjusting the pH value of the tartaric acid solution to achieve 5-9 by virtue of NaOH with a concentration of 1mol/L; and D. soaking the magnesium metal obtained in the step B in the tartaric acid solution prepared in the step C, placing the tartaric acid solution in a water bath environment at 30-80 DEG C, standing for 3-12h, then taking out the magnesium metal and thoroughly washing the magnesium metal by virtue of deionized water, and carrying out vacuum drying; and the tartaric acid coating layer with the corrosion protection function is successfully constructed on the surface of the magnesium metal. After the surface of the magnesium metal is modified through the method, the corrosion speed of a corrosive environment for the magnesium metal can be much effectively controlled, so that the corrosion-degradation period of the magnesium metal is matched with the treatment-recovery period of organisms when the magnesium metal is used as a biodegradable medical material.

The invention relates to a method and system for manufacturing microscopic speckle in a digital image correlation method by using a femtosecond laser, and belongs to the technical field of micro-deformation measurement. The microscopic speckle is etched on the surface of a sample to be manufactured by using a femtosecond laser; the etched microscopic speckle moves along with deformation of the sample to be manufactured, and can serve as an information carrier for digital image correlation measurement, so that the displacement, strain and other information of the sample to be manufactured under the load can be measured. The etched microscopic speckle can reach the micron scale and is suitable for measuring microdeformation, the etching depth does not exceed 2 microns, the influence on the performance of the to-be-manufactured sample is small, the microscopic speckle can not loss effect under high-temperature, the method is suitable for most materials such as metal materials, ceramic materials, organic materials, composite materials and the like, the etching process is automatically controlled, and the efficiency is high.

The invention discloses a preparation method of high-purity nuclear graphite, and provides graphite, wherein the ash content of the graphite is less than about 300 ppm; the boron equivalent of the graphite is less than about 5.0 ppm; and the isotropous ratio of the graphite is about 0.85-1.5, which is calculated by dividing the CTE (Coefficient of Thermal Expansion) in the crosscutting texture direction by the CTE in the texture direction. The preparation method disclosed by the invention comprises the following steps of: grinding uncalcined needle coke into fine powder, mixing the fine coke powder with an adhesion agent, namely asphalt, then, grinding the mixture to form moulding powder, uniformly moulding the powder to form an expected shape of a graphite part, and roasting, densifying and graphitizing the blank product so as to obtain high-purity graphite having high isotropy. The high-purity nuclear graphite prepared by the invention is free from impurities and still has improved isotropy and controllable average density and bending strength; and thus, the high-purity nuclear graphite can be applied to a new generation of nuclear fission and ultra-high-temperature reactors.

The invention provides a vortex resonance multistage cusped field micro-newton-scale ion propulsion device, belongs to the field of plasma propulsion, and particularly relates to a vortex resonance multistage cusped field micro-newton-scale ion propulsion device. The device solves the problems that an existing micro-newton-scale thruster cannot meet the requirements for large-range adjustability of thrust, high-precision thrust control and the like in major tasks such as space gravitational wave detection and space gravitational field detection are solved. The device comprises a discharge cavity, a screen grid and an accelerating grid, wherein the screen grid and the accelerating grid are fixed to the open end of the discharge cavity, a quartz guard plate is coaxially and fixedly arrangedinside the discharge cavity, the discharge cavity comprises an annular wall plate and a bottom plate, the bottom plate is fixedly arranged at one end of the annular wall plate, a plurality of incensecoil-shaped antennas are arranged on the end face, close to the quartz guard plate, of the bottom plate, the incense coil-shaped antennas form a periodic topological structure array on the bottom plate, and multistage annular permanent magnets are arranged on the side wall of the annular wall plate. The device is mainly used for propulsion of plasmas.

The invention provides a magnetron, which comprises a center magnetic control partition, an edge magnetic control partition and a driving mechanism, wherein the driving mechanism can synchronously or independently drive magnetic body groups in the center magnetic control partition and the edge magnetic control partition and make the magnetic body groups run in the own magnetic control partition according to predetermined tracks. The magnetron can effectively increase the metal atom ionization rate of the whole target region, particularly an edge region, so as to improve the hole filling uniformity of the edge region of a substrate. Furthermore, the invention also provides thin film deposition treatment equipment applying the magnetron.

The invention provides an imaging system for installing an armor block of a breakwater and an application technique thereof. A three-dimensional image sonar is used for continuously scanning underwater, positioning coordinates are obtained by a positioning unit, the kinematic error is corrected by an attitude sensor, and a physical model is resolved by a computer so as to generate a three-dimensional diagram containing coordinate information and guide the installation construction of the armor block. A sonar real-time imaging technique is used for installing the underwater armor block of the breakwater, so that frequent positioning and underwater measurement and touch of divers can be omitted, a large amount of time is saved, and the safety risk is reduced; an accurate positioning result is guaranteed by self attitude correction, the influence of wind wave on construction can be effectively reduced, blocks can be accurately put and are hooked and connected with each other, the density and direction can be controlled, the installation quality of the blocks is increased, the wave resistant capability of the breakwater is guaranteed, and a crane operator can know complete information of the armor block, information asymmetry and misunderstanding from the computer in the whole installation process, so that the construction accuracy is greatly guaranteed.

The invention discloses a large-central-angle magnetic shoe forming upper die and a large-central-angle magnetic shoe forming method. The large-central-angle magnetic shoe forming upper die comprises a forming upper die body, the lower end face of the forming upper die body is provided with an inwards-concave arc-shaped face, the top of the forming upper die body is provided with a main water storage cavity, and the main water storage cavity is externally connected with a vacuum negative pressure pipeline; a left branch water storage cavity and a right branch water storage cavity are formed in the positions, located below the main water storage cavity, of the upper die body, the left branch water storage cavity and the right branch water storage cavity are not directly communicated with the main water storage cavity, and the main water storage cavity, the left branch water storage cavity and the right branch water storage cavity communicate with the lower end face of the upper die body 1 through a plurality of vertical small drainage holes, the left branch water storage cavity and the right branch water storage cavity are located above an arc left tail end and the arc right tail end of the arc face respectively. The large-central-angle magnetic shoe forming upper die and the large-central-angle magnetic shoe forming method further comprises the large-central-angle magnetic shoe forming method, the problem that the two sides of the arc of the magnetic shoe forming green body with the inner arc central angle larger than 145 degrees are prone to cracking can be solved, the forming yield of the large-central-angle magnetic shoe is greatly increased, and the method can adapt to the full-automatic magnetic shoe forming process.

The invention relates to technical method and apparatus for surface compactness of timber. The apparatus includes a wood test piece, left and right clamping blocks, a lifting work table, a column surface loading head, and a loading head fixing block. The method includes: 1) fastening the column surface loading head on the loading head fixing block through screws, and connecting the loading head fixing block with a crank-link mechanism; 2) regulating levelness and height of the column surface loading head and lifting work table; 3) setting reciprocating travel and compression feeding speed; 4)pre-softening the timber; 5) fixing the wood test piece on the lifting work table; 6) performing repeated compression. The method and apparatus have the advantages of: by controlling the compression quantity and the radius of the loading head, controllability on the thickness of the compact layer on the surface of timber and the compactness is achieved; the surface of the timber is subjected to repeated compression, so that resilience of compression deformation is greatly reduced, wherein the production process is free of pressure maintaining, thus greatly increasing productivity; the method and apparatus can achieve automatic flow line production and are free of any chemical reagents, thus achieving environmental protection.