10results about How to "Reduce particle count" patented technology

The invention relates to the technical field of freeze-dried preparations, and provides exosome freeze-dried powder as well as a preparation method and application thereof. The exosome freeze-drying preparation is prepared by mixing an exosome solution and a freeze-drying protection solution and then freeze-drying the mixture, the concentration of the exosome solution in the mixed solution is 0.1-10% V / V, and the freeze-drying protection solution comprises 0.4-4% W / V of saccharides and 0.25-4% W / V of alcohols; the saccharide is trehalose, cane sugar or lactose; the alcohol is mannitol, sorbitol or a combination of mannitol and polyethylene glycol; and the solvent is sterilized water for injection or a PBS buffer solution. The exosome freeze-dried powder is stable in activity, small in irritation, good in safety and good in fibroblast proliferation promoting capacity, when the exosome freeze-dried powder is applied to supporting essence or masks in the medical beauty industry, the exosome activity of the exosome freeze-dried powder is still kept stable, and the application prospect is good.

The invention relates to the technical field of pulverized coal separation, in particular to a cyclone separator, a pulverized coal separation system and a cyclone separator structure optimization method.The cyclone separator comprises an air inlet unit which comprises an air inlet assembly and a separation assembly connected with the air inlet assembly; and the discharge unit comprises an exhaust assembly arranged on the inner side of the separation assembly and a dust discharge assembly arranged at the bottom of the separation assembly. The cyclone separator has the beneficial effects that by arranging the spiral channel, the centrifugal force after dust-containing gas enters can be increased, the dust particle separation efficiency is improved, the longitudinal circulation phenomenon at the top of the separator can be effectively avoided, the influence of a top ash ring is relieved, and mutual interference of airflow in adjacent inner and outer rotational flows is avoided; and the number of particles of large-particle-size dust entering the exhaust pipe through longitudinal circulation is reduced, the flow field can be stabilized, the separation performance is improved, and the separation efficiency of small-particle-size dust is improved.

The utility model relates to the technical field of filtering devices, in particular to a basket type filter, which comprises a barrel body, a barrel body, a filter screen, a filter screen, a filter screen, a filter screen, a filter screen and a filter screen, the barrel body is provided with a feed port and a discharge port, and the bottom of the barrel body is provided with a storage bin; the screen drum is arranged in the drum body, a first filtering space communicated with the storage bin is formed in the screen drum, first filtering holes are formed in the screen drum, and the discharging port is located in the outer side of the screen drum; the screen structure is arranged between the screen drum and the discharge port, a second filtering space communicated with the storage bin is formed between the screen drum and the screen structure, a second filtering hole is formed in the screen, and the aperture of the second filtering hole is smaller than that of the first filtering hole. The basket type filter provided by the utility model is used for overcoming the defect that the existing basket type filter cannot intercept metal non-magnetic foreign matters with smaller particle sizes, such as Cu / Zn and the like.

The invention relates to an unmanned aerial vehicle target positioning method based on improved mutation firefly optimization particle filtering, and the method comprises the steps: fusing an optimization mechanism of a firefly algorithm in a frame of a particle filtering algorithm, and guiding particles to move towards a high-likelihood region; a multi-variation strategy and an elastic force mechanism are introduced to change a particle interaction mode, and the problem of particle degradation caused by serious nonlinear factors and excessive optimization is solved; the target position is optimally estimated by using the mutation firefly optimization particle filter, the number of particles required by the operation of the standard particle filter algorithm is reduced, and the robustness and the positioning precision of the algorithm are improved.

The invention discloses a particle source output method, device and equipment based on a flow field edge interface and a storage medium, and relates to the technical field of computational fluid mechanics, and the particle source output method based on the flow field edge interface comprises the steps that triangular mesh data of the flow field edge interface is acquired, the triangular mesh data comprises mesh areas and vertex coordinates of all triangular meshes of the flow field edge interface; calculating characteristic parameters of the flow field boundary interface according to the vertex coordinates and the grid area; calculating particle source characteristic parameters of the flow field boundary interface based on the characteristic parameters and a preset flow line number; and outputting a particle source corresponding to the flow field boundary surface according to the particle source characteristic parameters. The number of actual particles required for flow line calculation is effectively reduced, boundary surface particles are uniformly distributed, the accuracy of a plane particle source is further improved, and the particle source is prevented from penetrating through a flow field boundary interface.

A method for recycling cellulose acetate, which comprises the following steps: dissolving the waste tow, waste filter rod or waste mouth rod generated in the process of producing filter rod for cigarettes after removing impurities in acetic acid aqueous solution, filtering, water solution precipitation, solid-liquid separation, washing to remove the forming paper, water pine paper and TiO2, and obtaining diacetate cellulose with quality meeting the use requirements of downstream products. The present application can completely remove the residual forming paper and water pine paper and TiO2 in the prior art. The quality of cellulose acetate before and after regeneration is compared, and it is found that AV and IV fluctuate slightly, which does not affect the use, but the PV value of regenerated cellulose acetate increases greatly, which shows that filtering and washing can significantly remove residual impurities, the quality of regenerated cellulose acetate is significantly improved, and the commercial use requirements are met; the present application has a very positive effect on reducing production cost and environmental protection.

The present invention is a bonded light-emitting element wafer in which a light-emitting element epitaxial wafer having an epitaxial layer including an active layer is bonded to a transparent substrate with an adhesive layer interposed therebetween, the transparent substrate being visible-light-transmissive and ultraviolet-light-transmissive. The adhesive layer is visible-light-transmissive and ultraviolet-light-impermeable, and the height at which spinous inclusions contained in the epitaxial layer protrude from the epitaxial layer is equal to or less than the thickness of the adhesive layer. The present invention thereby provides a bonded light-emitting element wafer in which an epitaxial wafer having thorn-like inclusions is bonded to a transparent substrate with an adhesive layer interposed therebetween, the adhesive layer being visible-light-transmissive and ultraviolet-light-impermeable, and the transparent substrate being visible-light-transmissive and ultraviolet-light-transmissive, the range of defective parts caused by spiny inclusions is narrow.

The utility model discloses a disposable visual drainage operation towel, and relates to the technical field of medical operation auxiliary materials, in particular to a disposable visual drainage operation towel. The utility model discloses a double-layer non-woven fabric operation towel which is 120 cm in overall length and 120 cm in width. A through hole is formed in the center of the operation towel; pasting dressings made of transparent materials are arranged on the through holes and pasted to the through holes; two shapeable supporting strips are symmetrically arranged on the two sides of the through hole of the operation towel. The operation towel is further provided with an adhesive fixing buckle used for fixing the telescopic drainage tube. A conversion head is assembled on the telescopic drainage tube; the operation towel is connected with the drainage device through the adapter, and the connection assembly position is fixed to the operation towel through the pasting fixing buckle. According to the technical scheme, the problems that in the prior art, an operation towel is complex to lay and low in efficiency; the doctor-patient feeling is poor; the blood loss amount cannot be accurately calculated; consumables and labor cost are high; the indoor air quality is reduced by the decontaminated operation towel, and the like.

The invention provides a method for improving bonding interface quality of a composite substrate and the composite substrate. The method comprises the following steps: providing two substrates to be bonded, growing a buffer layer on a to-be-bonded surface of at least one of the two substrates, and then carrying out bonding to obtain a composite substrate; the method for growing the buffer layer comprises the following steps: (1) pre-cleaning a reaction chamber, then placing a substrate in the pre-cleaned reaction chamber, and depositing the buffer layer on a to-be-bonded surface of the substrate; and (2) carrying out preliminary cleaning on the surface of the buffer layer obtained by deposition, then turning on radio frequency, introducing oxygen, and carrying out oxygen plasma cleaning. The process before and after deposition of the buffer layer is optimized, the number of particles in the buffer layer can be effectively reduced, and therefore the bonding interface quality of the composite substrate can be effectively improved.

The invention relates to a preparation method of a flame-retardant washable water-based acrylate resin coating with moderate compatibility, which comprises the following steps: adding water, an emulsifier and methacrylic acid, stirring to react for 60 minutes, adding a monomer A, a charring agent intermediate, DOPO and 3, 4-epoxy-1-butene, and emulsifying for 20-30 minutes; heating to 80-90 DEG C, dropwise adding an initiator, reacting for 1-2 hours, adding diethanol amine, and reacting for 1-2 hours to obtain a core-layer emulsion; the preparation method comprises the following steps: adding a monomer A and a monomer B into a reaction kettle, dropwise adding a monomer B and an initiator at the same time, keeping the temperature at 75-85 DEG C, stirring and reacting for 1.5 hours, adding DOPO, 3, 4-epoxy-1-butene and an initiator, reacting for 1 hour at 60-70 DEG C, cooling to 50 DEG C, adding an emulsifier B, reacting for 30 minutes, and adding ammonia water to adjust the pH value to 7-8, so as to obtain the flame-retardant washable water-based acrylate resin coating with moderate compatibility, and the obtained acrylate resin has good flame retardance and washability.