14results about How to "Small aperture" patented technology

The laser chip and its fabrication method disclosed herein include a first reflective layer, an active region, an oxide layer, and a second reflective layer sequentially disposed on a substrate. The laser chip has a first trench and a second trench for oxidizing and etching the oxide layer. A first connecting portion connects one end of the first trench to one end of the second trench, and a second connecting portion connects the other end of the first trench to the other end of the second trench. Due to the influence of crystal anisotropy on the oxidation rate, and the mutual coordination of the first and second connecting portions on the oxidation rate, the oxide aperture includes a first oxide arc, a second oxide arc, a third oxide arc, and a fourth oxide arc. The first and second oxide arcs are arranged opposite each other, as are the third and fourth oxide arcs. The third and fourth oxide arcs have different radii of curvature, forming a specific irregular morphology. The oxide aperture based on the irregular morphology can effectively suppress transverse multimode lasing of the optical signal and reduce mode degeneracy.

The application discloses a kind of low basis weight high-density fiber material preparation methods, the fiber material includes fiber layer and hot melt powder layer;The fiber layer is filled with superfine powder;Including the following steps: (1) polyvinyl alcohol ultra-short fiber, polyester superfine ultra-short fiber, fine denier ultra-short cellulose fiber are made into mixed slurry, then wet-laid web is made;(2) the wet-laid web is consolidated into intermediate material, then the intermediate material hot water bath is made, and polyvinyl alcohol ultra-short fiber is dissolved;(3) superfine powder is made into suspension, and filled into intermediate material;(4) hot melt powder is made into suspension slurry and coated and fixed.Reduce the unit area mass of material, increase the density of material under low basis weight, utilize the thermal closing pore effect of superfine powder, ensure the safety of battery separator product.Realize the technical requirement of low basis weight, high density and high porosity, solve the problem that existing fiber material cannot meet the use requirement of battery separator.

This invention provides a method for preparing bamboo fiber for textiles, belonging to the field of fiber extraction technology. The preparation method includes bamboo strip pretreatment, enzyme immobilization, and bamboo fiber extraction. The bamboo strip pretreatment method is as follows: whole bamboo is taken, crushed and cut, and bamboo strips with a length of 6-8 cm, a width of 0.5-0.7 cm, and a thickness of 0.3-0.5 cm are taken. The strips are ultrasonically treated for 25-35 min, then soaked in NaOH solution for 30-40 min, filtered, washed with deionized water until neutral, and dried to a moisture content of 15-20% to obtain pretreated bamboo strips. The bamboo fiber extracted by this invention has a tensile strength of 1.21-1.28 GPa, a breaking elongation of 4.09-4.17%, an elastic modulus of 37.15-37.26 GPa, and an average enzyme activity retention rate of 66.3-68.4% after 10 reuses.

The utility model discloses a textile processing equipment nozzle device relates to the field of textile equipment, including base, the inside fixedly connected with bottom plate of base, the inside of bottom plate is established with the feedway, the upper surface fixedly connected with the connecting plate of bottom plate, the upper end fixedly connected with the conical ring of connecting plate, the inside through -going of conical ring is established with the feed hole, the top fixedly connected with the spray head of conical ring, the feed hole with feedway intercommunication, the inside through -going connection with the feed pipe of base, the right -hand member of feed pipe with feedway intercommunication. In the utility model, the inside of feedway is sent into the feed hole with dye, and the aperture of reduction accelerates the flow rate of dye, and simultaneously through the diameter of reducing spray head and conical head accelerates the gas flow, and dye and gas collide together, thereby the spray of dye atomization is to the work piece, and the even spray of convenient is prevented to cause the damage to work piece.

The invention provides a cotton fiber / nitrocellulose composite membrane and a preparation method and application thereof.The preparation method comprises the following steps that S1, a cotton pulp board is beaten into cotton fiber-containing cotton pulp, the cotton fiber-containing cotton pulp is added into an acetic acid buffer solution of sodium periodate, a first reaction is conducted, an obtained product is washed and then added into a NaBH4 solution, and a second reaction is conducted; carrying out a second reaction, and washing the obtained product to obtain cotton fibers oxidized by sodium periodate; and S2, mixing the cotton fibers oxidized by sodium periodate with a cellulose nitrate and carboxymethyl cellulose suspension, carrying out suction filtration to form a membrane, so as to obtain an ox-CF / NC / CMC composite membrane, immersing the ox-CF / NC / CMC composite membrane into a gelatinized cationic starch suspension, taking out the membrane, and drying the membrane, so as to obtain the ox-CF / NC / CMC / CS composite membrane. The protein adsorption performance and the color development performance of the composite membrane are enhanced.

This invention discloses a method for preparing a gas separation membrane, specifically a method for densifying and hydrophobically modifying the outer surface of a hollow fiber membrane. The invention primarily involves mixing isotactic polypropylene granules in a mixer and heating them to 150-200°C. The granules are then stretched and extruded into a membrane through a spinneret while in a molten state. The membrane is then cooled for 1-3 minutes in a cooling chamber using volatile alkanes or alcohols as atomizing cooling media. Finally, the hollow fiber membrane fibers are stretched and drawn onto rollers, automatically wound onto the rollers to form the original membrane fibers. These fibers are then subjected to post-treatment processes such as overnight soaking in deionized water and washing to obtain the hollow fiber degassing membrane. The advantages of this invention are that it eliminates the need for introducing other components (the alcohol solvent is fully evaporated without residue), avoids material compatibility and stability issues between different components, and provides a long-lasting and reliable hydrophobic enhancement effect.

This invention relates to a staggered covalent organic framework thin film, its preparation method, and its application, belonging to the field of thin film technology. The invention first dissolves an amine monomer in acetic acid solution to obtain an aqueous solution; then dissolves an aldehyde monomer in mesitylene to obtain an organic solution; finally, the aqueous and organic solutions are added to the aqueous and organic phase chambers of a diffusion cell, respectively, for interfacial polymerization. After the reaction, the membrane material is removed, washed, and dried to obtain the staggered covalent organic framework thin film. This film forms a staggered stacked structure and constructs sub-nanometer transport channels with pore sizes of approximately 0.5 nm to 0.7 nm. Through a synergistic mechanism of Donnan repulsion and hydrogen bonding interactions, it maintains structural stability under extreme environments of high acidity, strong corrosion, and high radiation, achieving highly efficient selective permeation of protons and efficient retention of metal ions in high-level radioactive waste liquids.

A method for preparing an ammonia nitrogen-rejecting reverse osmosis membrane based on a support layer with controllable amination degree is disclosed. This invention aims to address the problem of poor selective separation performance of ammonia nitrogen in reverse osmosis membranes prepared based on inert support layers. The method comprises: 1. Synthesizing APAEPO polymer with controllable amination degree; 2. Preparing a polymer support layer with controllable amination degree using a solvent-inducible phase inversion method; 3. Preparing an ammonia nitrogen-rejecting reverse osmosis membrane using interfacial polymerization. This invention allows for flexible control of the membrane's ammonia nitrogen rejection rate (92.2%~99.1%) and water flux by adjusting the amination degree of the support layer (0-80%), meeting the needs of different reclaimed water treatment scenarios (such as low-ammonia nitrogen wastewater reuse and high-ammonia nitrogen wastewater deep purification), thus having a wide range of applications. The preparation process of the amination polymer in this invention does not require the introduction of toxic modifiers, the polymerization reaction conditions are mild, secondary pollution is minimal, and it can be directly industrialized.

The utility model belongs to the technical field of high-pressure water cleaning equipment, and discloses an ultrahigh-pressure stainless steel pipe sealing and connecting structure which comprises two stainless steel pipes which are in threaded connection with a concave plate connecting piece and a flat plate connecting piece respectively. The end face of the concave plate connecting piece is attached to the end face of the flat plate connecting piece, and a groove is formed in the end face of the concave plate connecting piece and used for installing a high-pressure sealing ring. Shoulders expanding outwards in the radial direction are arranged at the butt joint positions of the concave plate connecting piece and the flat plate connecting piece; the two flange rings sleeve the outer sides of the concave plate connecting piece and the flat plate connecting piece respectively, and the inner sides of the two flange rings abut against the two circular beads respectively; the two flange rings are connected through a bolt assembly. By means of the split type design, the high-pressure water cleaning device has the advantages of being good in sealing performance and pressure resistance, convenient to disassemble and assemble and low in cost, and is suitable for being applied to the field of high-pressure water cleaning.

This invention provides a composite nanofiltration membrane, its preparation method, and its application, belonging to the field of pollutant removal technology. The invention first coats the surface of a macroporous base membrane with a high molecular weight polyelectrolyte system to cover the macropores, then fills the micropores of the base membrane with a low molecular weight polyelectrolyte. This improves the retention rate of micropollutants in the layer-by-layer self-assembled membrane, reducing pore size while maintaining high permeability. This invention prepares a multilayer composite nanofiltration membrane by coating polyelectrolyte systems of different molecular weights onto a high-porosity base membrane and repeating the coating process. The prepared composite nanofiltration membrane achieves a removal rate of over 90% for micropollutants with a molecular weight of around 200 Da, with a maximum removal rate of 99.8%.

This invention relates to the field of air conditioning technology, and discloses an air intake noise reduction structure and an air conditioning range hood. The air intake noise reduction structure includes: an air intake plate with an air inlet; and a noise reduction channel disposed within the air inlet. The noise reduction channel includes noise reduction holes formed inside the air intake plate and a guide channel connecting the noise reduction holes and the air inlet. The guide channel has a guide surface suitable for gradually guiding the airflow and / or sound waves entering from the air inlet to the noise reduction holes. The air conditioning range hood includes: a main air inlet on a smoke hood; and an auxiliary air inlet on the smoke hood, on which the aforementioned air intake noise reduction structure is installed. This invention, without changing the size of the air inlet area, guides the airflow and sound waves entering from the air inlet to the noise reduction holes of the air intake plate through a guide channel set on the inner circumference of the air inlet. The noise reduction holes utilize multiple reflections of noise at the air inlet to dissipate sound wave energy, thereby achieving noise reduction.

The application relates to a light-weight concrete insulation board and a preparation method thereof, and belongs to the technical field of building insulation boards. The light-weight concrete insulation board is mainly prepared from the following components: cementing material 350-400 parts by weight, light-weight aggregate 71-81.5 parts by weight, additive 10-17.5 parts by weight, foaming agent 1.5-2.0 parts by weight, reinforcing fiber 0.8-1.2 parts by weight, silica sol 2-3 parts by weight and water 160-200 parts by weight. The light-weight concrete insulation board provided by the application can significantly improve the insulation performance on the basis of guaranteeing mechanical properties such as compressive strength, and can guarantee the anti-freezing performance of the insulation board under low-temperature conditions.

This invention belongs to the field of tower foot welding technology, specifically referring to a welding device for the feet of power angle steel towers. It includes a support frame, a transverse slide, a positioning platform, a measuring drive mechanism, a dust-collecting welding mechanism, a compressed air anti-scattering mechanism, and a controller. The transverse slide is mounted on the upper wall of the support frame, and the positioning platform is symmetrically positioned on the upper walls at both ends of the support frame. The measuring drive mechanism is mounted on the transverse slide and includes a drive component, a sliding component, and a measuring component. The drive component is located on the upper walls at both ends of the transverse slide, the sliding component is located on the upper wall of the transverse slide, and the measuring component is located on the side wall of the drive component. This invention provides a welding device for the feet of power angle steel towers capable of collecting welding fumes generated during the welding process and compressing the dust particles in the welding fumes into a cake to prevent secondary diffusion of the fumes.

This application relates to the field of photovoltaic module technology, providing a shaped busbar and a photovoltaic module. The shaped busbar includes a busbar portion and a connector portion. The busbar portion extends along a first direction and is used for electrical connection with the cell string of the photovoltaic module. The first direction intersects with the main grid lines of the photovoltaic module cells. The connector portion includes a first part and a second part. The first part is connected to one end of the busbar portion, and the second part is connected to one side of the first part along a second direction and protrudes from the outer edge of the busbar portion. The connector portion is used to pass through the wiring hole of the photovoltaic module and be electrically connected to the junction box. The second direction intersects with the first direction. This application can reduce the aperture of the wiring hole while ensuring the current carrying capacity of the shaped busbar module, thereby improving the structural strength and reliability of the photovoltaic module.