37results about How to "Control the rate of diffusion" patented technology

The invention discloses a device for controlling the delivery and the uniform distribution of reaction gas in a MOCVD reaction chamber. By respectively controlling the flow of gas passages non-uniformly distributed radially on a front gas homogenizing plate and input passages at different positions, at least two reaction gases are respectively introduced into two paths which are radially and axially crossed on a spray header, and can be secondarily distributed by nozzles in different shapes, so the uniformly distributed boundary layer concentration, speed and temperature required are achieved on the surface of a rotary epitaxial wafer, the quality of massively produced epitaxial films and the finished product ratio of massively produced epitaxial wafers are improved, the consumption of expensive reaction gases can be effectively controlled and the epitaxial production cost is reduced. By properly increasing the distance between the surface of the spray header and the epitaxial wafer, deposits generated on the surface of the spray header and the nozzles in the epitaxial growth are reduced, the cleaning period is prolonged, and the production efficiency and system capacity are improved. The device also can reduce the processing difficulty and manufacturing cost of the nozzles of the spray header and cooling medium passages.

The invention discloses a grain boundary diffusion method of an R-Fe-B rare-earth sintered magnet, an HRE diffusion source and a fabrication method thereof. The grain boundary diffusion method comprises the following steps of forming film engineering A on a high-temperature resistant carrier, wherein HRE compound powder is attached onto the film, and the HRE is selected from at least one of Dy, Tb, Gd and Ho; and placing the R-Fe-B rare-earth sintered magnet and the high-temperature resistant carrier processed by the engineering A in a processing room, performing thermal treatment on the R-Fe-B rare-earth sintered magnet and the high-temperature resistant carrier in vacuum or inert atmosphere, and supplying HRE engineering B to a surface of the R-Fe-B rare-earth sintered magnet from the high-temperature resistant carrier. By the method, consumption of a heavy rare-earth element can be reduced, and the loss of residual magnetism Br of the magnet is controlled as well as the coercivity is improved.

The invention discloses a method for preparing a carbon nano-tube with controllable number of tube wall layers. The method comprises the following steps of: preparing transition metal salt, support salt and dispersant into sol or solution with de-ionized water after the transition metal salt, the support salt and the dispersant are mixed, and drying the sol or the solution with a sol-gel method or a freeze-drying method, thereby acquiring catalyst; putting the catalyst into a catalyst chamber which is sent into a thermostatic reactor of a CVD device and feeding carbon source gas in the protecting atmosphere to grow the carbon nano-tube. The method can control the diffusion velocity of carbon atoms in metallic nano-particles through changing the flow rate of the carbon source gas and the mol ratio of the transition metal salt to the support salt to the dispersant, thereby controlling the number of the tube wall layers of the carbon nano-tube. The method has a simple process, and prepares the carbon nano-tube with controllable number of the tube wall layers with high purity, thereby overcoming the defects that the prior prepared multi-wall carbon nano-tube is actually a carbon nano-tube mixture with uncertain number of tube wall layers, and providing a foundation for scientific research on various carbon nano-tubes with different numbers of the tube wall layers.

The invention relates to a preparation method of a titanium anode for water treatment. The preparation method specifically comprises the following steps: carrying out pretreatment on a titanium substrate; preparing an active coating solution; and performing sintering. WO3 which is good in chemical stability, has catalytic activity and is low in cost is introduced into a traditional ruthenium-titanium active component, the service life of the anode is effectively prolonged, and the manufacturing cost of the anode is reduced.

The invention relates to a carbon-fiber washing machine for carbon fiber precursor washing. A multilevel washing trough is installed at the front portion of a machine frame 1, a driving roller and a guiding roller are installed on the machine frame 1, and two transmission systems are installed at the back portion of the machine frame 1. The carbon-fiber washing machine is superposed by five-level water troughs in a dislocation mode, the washing time is prolonged, and the occupied area of the device is saved to a maximum degree. As liquid level plates, flow stopping plates and overflowing plates are designed in the washing troughs, the washing process is intensified; as the two ends of the washing troughs are distributed in a dislocation mode, the number of driving roller is reduced, the contact area of fibers and rollers is reduced, and the broken filament generating probability caused by friction is reduced; deionized water used by the carbon-fiber washing machine flows to the next washing trough from the last washing trough and is recycled, and the cost is reduced while the washing effect is improved. The carbon-fiber washing machine has the advantages of being simple in structure and convenient to daily maintain and operate.

The invention provides core-shell lightweight aggregate and a preparation method thereof. The core-shell lightweight aggregate comprises a core and a shell according to a mass ratio of 1:1-2:1, the core comprises, by weight, 65-85% of sludge, 6-12% of calcium superphosphate, 5-10% of potassium sulfate, 3-8% of manganese nitrate, 5-11% of ammonium phosphate and 4-10% of sodium chloride, and the shell comprises, by mass, 75-85% of polluted soil, 10-15% of sludge and 5-10% of glass powder. The preparation method includes: adopting the sludge as a main raw material, and adding inorganic salt and phytonutrient containing nitrogen and phosphorus to prepare the core; adopting the polluted soil as a main raw material, and adding the glass powder which is a sintering aid to prepare the shell; coating the shell onto the core by means of high-temperature sintering. Recycling rate of solid waste like the sludge and the polluted soil is increased, the lightweight aggregate suitable for plant hydroponics is developed, and the lightweight aggregate is of quite important economic, environment-protection and scientific-research significance.

The invention provides a defect repairing method of an investment precision casting for a liquid rocket engine. The defect repairing method comprises the following steps of: positioning defects; removing the defects; machining a groove; treating a repair welding part; performing welding; and performing postweld treatment. According to the defect repairing method, welding wires for ZG03Cr13Ni5Co9Mo5 and ZG06Cr14Ni7Mo castings are defined, and a welding process database based on the initial thickness of repair welding parts of the castings and a postweld heat treatment system are established; acorresponding repair process is adopted; the tensile strength of an obtained ZG03Cr13Ni5Co9Mo5 weld joint at a room temperature is greater than 1070 MPa (the matrix strength is not lower than 1180 Mpa), the rate of elongation is not lower than 15%, and the low-temperature impact toughness at the temperature of minus 196 DEG C is not lower than 39 J; the tensile strength of a ZG06Cr14Ni7Mo weld joint at a room temperature is greater than 900 MPa (the matrix strength is not lower than 980 Mpa), the rate of elongation is not lower than 12%, and the low-temperature impact toughness at the temperature of minus196 DEG C is not lower than 31 J; the internal quality and the surface quality of the weld joints are qualified; and the weld joints meet the I-grade weld joint standard of QJ1842-95 structural steel and stainless steel fusion welding technical conditions and the use requirements of spaceflight products.

The invention discloses a vehicle-mounted fragrance system. The vehicle-mounted fragrance system comprises fragrance equipment, a controller and interaction equipment, the fragrance equipment comprises a plurality of fragrance bodies with different fragrance smells and characteristic parameters, and the fragrance device obtains the characteristic parameters of the fragrance bodies, controls opening or closing of the fragrance bodies, detects correction parameters in the cabin and adjusts the diffusion speed of fragrance. The controller recognizes the fragrance body according to the characteristic parameters and knows the state of the fragrance body, adjusting parameters are calculated according to the correction parameters, and the fragrance equipment adjusts the diffusion speed of fragrance according to the adjusting parameters. The interaction device displays the recognized fragrance body and the state of the fragrance body and receives a user instruction, and the controller controls the fragrance device to operate the fragrance body according to the user instruction. The invention further discloses a control method of the vehicle-mounted fragrance system. The system has the self-learning and self-adapting functions, and the rotating speed of the fan can be adjusted according to the actual situation in the cabin so as to control the diffusion rate of fragrance.

The invention discloses a magnetic response dynamic autocrine coating as well as a preparation method and a use method thereof, and belongs to the field of surface protection. The coating comprises three film layers including priming paint, intermediate paint and finish paint. The priming paint is used for enhancing the adhesive force between the coating and a substrate, and the intermediate paintis doped with magnetic filler, contains lubricating oil and can deform and vibrate under the condition of an alternating magnetic field. A pore-forming agent is added into the intermediate paint filmlayer, and bottom micropores are large in size while upper micropores are small in size, so that a large amount of lubricating oil can be stored in the micropores and diffused to the surface; The exterior of the finish paint is of a micro-nano rough structure, and when lubricating oil permeates into the surface layer, a super-smooth surface is formed. The coating can quickly respond to a magneticfield to form a micro-vibration surface to extrude internal oil bags to deform to secrete lubricating oil. Due to the synergistic effect of the super-smooth surface and the dynamic surface, the anti-corrosion, anti-fouling and protection functions are greatly enhanced, and the service life of the super-smooth surface is greatly prolonged. The coating has important enlightenment significance for the development of an anti-fouling technology.

The invention discloses a self-adaptive edge preserving denoising method based on an anisotropic diffusion model. The method comprises the following steps of preprocessing an original noise image, constructing a denoising algorithm model, performing iterative calculation on the original noise image and performing denoising processing on the original noise image. According to the method, the diffusion coefficient of the adaptive image denoising algorithm based on the combination of the fractional order differential operator and the Gaussian curvature is improved, bilateral filtering and local variance are added, the regularization item is introduced into the diffusion model, the image edge preserving effect is improved, the diffusion coefficient of the adaptive image denoising algorithm model is corrected, the denoising and edge maintaining effects are better, and the visual effect of the image is improved; the diffusion coefficient is adjusted by using the local variance so as to better control the diffusion speed; the image fidelity is improved by adding a regularization item, and an adaptive threshold is used, so that the medical image processing method is superior to a traditional image processing method in the aspect of processing a medical image besides a natural image.

The invention provides a continuous diffusion furnace which comprises a furnace body with two open ends, a first air inlet pipe with an open end and an enclosed end, a second air inlet pipe with an open end and an enclosed end, and an exhaust pipe which is fixedly arranged on the inner wall of the furnace body chamber, wherein the first air inlet pipe is fixedly arranged on the inner wall of the furnace body chamber; the wall of the first air inlet pipe is uniformly provided with several small holes which are far from the inner wall of the furnace body chamber; the second air inlet pipe is fixedly arranged on the inner wall of the furnace body chamber; the wall of the second air inlet pipe is uniformly provided with several small holes which are far from the inner wall of the furnace body chamber; two ends of the exhaust pipe are both opened; negative pressure is applied on the two ends of the exhaust pipe; and the wall of the exhaust pipe is provided with several small holes which are far from the inner wall of the furnace body chamber. By the adoption of the ventilation method of the continuous diffusion furnace, consistent density of reactant gases around silicon chips in the same batch is realized. PN junctions of the silicon chips are uniform. And two breather pipes are simultaneously used for ventilation, so as to avoid obstruction of breather pipe holes.

Disclosed are a semiconductor structure and a forming method thereof. The forming method includes the following steps: forming a substrate; forming a gate structure on the substrate; forming source-drain doping regions located in the substrate on two sides of the gate structure; forming a dielectric layer on the substrate exposing from the gate structure, wherein the dielectric layer covers the source-drain doping regions; forming contacting holes passing through the dielectric layer, wherein the bottoms of the contacting holes expose the source-drain doping regions; forming an oxide metal layer on the source-drain doping regions exposing from the contacting holes; and forming plugs in the contacting holes in which the oxide metal layer is formed. The technical scheme of the invention caneffectively inhibit the phenomenon of Fermi level pinning at the interface of the plugs and the source-drain doping regions, thereby benefiting the reduction of the contact resistance between the plugs and the source-drain doping regions, and benefiting the improvement of the performance of the formed semiconductor structure.

The invention discloses a water stopping method for a steel pipe pile fore shaft. The water stopping method comprises the following steps that a phosphoric acid solution and a water glass solution areinjected into the bottom of the fore shaft at the same time through a drill rod, and a grout stopping layer is formed; and cement paste and the water glass solution are injected into the area above the grout stopping layer of the fore shaft through the drill rod at the same time for plugging. According to the water stopping method for the steel pipe pile fore shaft, the diffusion speed and distance of grout in water can be effectively controlled, it is guaranteed that a water flowing channel is rapidly blocked under the condition that water flows, and therefore the water stopping effect is good, grouting can go deep into the bottom of the fore shaft through the drill rod, saturated grouting is conducted from bottom to top, and water stop effect is better.

The invention provides a deodorization and bacteriostasis composition, a deodorant container and an adjustable deodorant container, and relates to the field of deodorization of public toilets. The invention aims to solve the problem that odor remains in public toilets and cannot be removed in the prior art. The invention firstly provides the deodorization and bacteriostasis composition. The deodorization and bacteriostasis composition is prepared from the following substances: cineole, camphene, phellandrene, terpilenol, geraniol acetate, isovaleraldehyde, citronellal, piperonone and d-limonene. According to the deodorization and bacteriostasis composition, various plant extracts are adopted for formula synthesis, plant single ions can be automatically emitted when the deodorization and bacteriostasis composition is placed in a natural environment, and when the single ions meet odor molecules, the single ions and the odor molecules can be rapidly subjected to gas capacity reaction to form odorless salt molecules and water molecules; and the deodorization and bacteriostasis composition disclosed by the invention has a good effect of eliminating peculiar smell, also has an effect of inhibiting growth of escherichia coli and staphylococcus aureus, and further has an effect of effectively repelling mosquitoes.

The invention discloses non-woven fabric sterilization equipment, which comprises a box body, a penetrating inner cavity is formed in the box body; a side inner cavity located in the box body is formed in one side of the penetrating inner cavity, the penetrating inner cavity and the side inner cavity are arranged in a penetrating mode, the penetrating inner cavity located in the box body is formedin the upper side of the side inner cavity, a middle cylinder is rotationally arranged in the end wall of the penetrating inner cavity, a non-woven fabric is wound on the outer surface of the middlecylinder body; the non-woven fabric penetrates through the penetrating inner cavity; according to the equipment, the non-woven fabric is continuously dragged by equipment in an external space; the non-woven fabric is continuously moved, the coiled non-woven fabric is fully disinfected in an alcohol dipping mode when the non-woven fabric is wound, and alcohol in the non-woven fabric is volatilizedand further disinfected in a heating roller extrusion mode when the non-woven fabric is pulled out of the equipment.

A biogas purifier and pressure gauge device for quickly interchangeable desulfurization bottles. It mainly solves technical problems such as unreasonable structure, inconvenient operation, easy waste of resources and easy corrosion of equipment in the existing biogas purifier. The key points of the technical scheme are: the two bottle stopper parts are symmetrically installed on the main body of the desulfurizer support part with screws, the wire interface of the valve body of the regulating valve part is connected with the short pipe of the bottle stopper of one side of the bottle stopper part with a plastic nut and a sealing sleeve and fixed on the small bracket on one side of the desulfurizer bracket part with screws; the wire interface of the display body of the display part is connected with the short tube of the bottle stopper of the bottle stopper part on the other side with plastic nuts and sealing sleeves, and fixed with screws On the small bracket on the other side of the desulfurizer bracket part; then use screws to fix the pressure gauge fixing card on the side of the small bracket on this side. Its structure is simple and reliable, easy to disassemble and install. The control valve part adopts ceramic valve core, which is light in hand and durable. It adopts a display with desulfurizer status, which can prompt the user to regenerate or replace the desulfurizer in time.