308results about How to "Small aperture" patented technology

The present invention proposes a nanofiber composite vehicle air filter paper with a gradient structure and a preparation method thereof, which is used to solve the technical problems of poor bonding strength between nanofibers and substrates and low filtration efficiency in nanofiber filter materials. The present invention uses a preparation process combining electrostatic spinning and electrostatic spraying to prepare a nanofiber composite vehicle air filter paper, which includes an ultrafine nanofiber mesh layer, a nanofiber layer and a filter paper layer arranged in sequence. The present invention has a good effect on PM under industrial standard wind speed conditions. 0.3 The initial filtration efficiency of particulate matter can reach 99.9%, reaching the H12 standard for air filtration materials. More importantly, in the self-cleaning backflush test, after 10,000 backflush tests, the PM 0.3 The filtration efficiency can still be maintained above 90%. This provides a new strategy for high-performance nanofiber filtration materials, which is of great significance to the high-tech, high-quality, green and sustainable development of nonwoven materials and filtration materials.

The invention discloses a preparation method of a high-performance magnesium-lithium separation membrane. The preparation method comprises the following steps: forming a polyamide film; mixing small molecular quaternary ammonium salt and amine monomer to serve as a solution for secondary interfacial polymerization; performing secondary interfacial polymerization to form a positive charge separation layer; and finally, promoting the reaction through high-temperature curing to obtain the nanofiltration membrane. According to the invention, the quaternary ammonium group with strong positive charges is introduced into the membrane in an in-situ grafting manner, the positive electricity of the membrane is increased, meanwhile, a transmission pore channel with positive charges is constructed, the operation is simple, the effect is obvious, the separation capacity of the membrane is greatly improved, and the method has a wide large-scale application prospect.

The invention discloses a preparation method of sandwich type immunomagnetic beads with high thermal stability, which comprises the following steps: by taking polystyrene microspheres as a template, introducing oil-phase Fe3O4 nanoparticles into the polystyrene microspheres through a swelling method, and then carrying out hydrolytic condensation reaction on the surface of a microsphere assembly by utilizing n-octyltrimethoxysilane OTMS to obtain the sandwich type immunomagnetic beads with high thermal stability. The preparation method comprises the following steps: carrying out surface amination modification on a silicon dioxide thin layer which is grown by hydrolysis of tetraethoxysilane TEOS to realize coating of an outermost organic shell layer, carrying out surface amination modification, and carrying out cross-linking on 1, 4-butanediol diglycidyl ether and erythritol on the surface to form an epoxy polymer layer so as to obtain the sandwich-type immunomagnetic bead with a cross-linked epoxy polymer layer introduced to the outer layer. According to the epoxy group modification process on the surface of the magnetic bead, a direct cross-linking modification process is adopted, so that the operation steps are simplified, and the obtained epoxy group magnetic bead is ensured to show excellent biocompatibility. In addition, the method omits the tedious process of functional group activation, and allows direct coupling with the antibody, thereby greatly improving the efficiency and convenience of the experiment.

The invention relates to a preparation method of a thermal shock resistant high-alumina brick. The preparation method comprises the following steps: S1, preparing a regulator; S2, mixing aggregate; S3, preparing a mixed grinding material; the thermal shock resistant high-alumina brick preparation equipment comprises a mixing and grinding device, a brick press and a tray, the mixing and grinding device comprises a mixing and grinding cylinder, a rotating stand, a grinding wheel and a scraper blade, a discharge port is formed in the lower portion of the circumferential side face of the mixing and grinding cylinder, a guide plate is arranged on the lower side of the discharge port, and a cover plate is arranged at an opening in the upper end of the mixing and grinding cylinder in a closed mode. And the cover plate is provided with a feeding hole. The invention aims to solve or at least alleviate the problem that a fine pore structure in a high-alumina brick is not easy to control when the thermal shock resistant high-alumina brick is produced, and provides a preparation method and preparation equipment of the thermal shock resistant high-alumina brick.

The invention discloses a hard carbon negative electrode material for a sodium-ion battery as well as a preparation method and application of the hard carbon negative electrode material. The hard carbon negative electrode material for the sodium ion battery is a graphite microcrystal cross-linked hard carbon material, and the carbon layer spacing is 0.37 nm to 0.40 nm; the range of the Raman D / G (w) value is 1.1-1.6; and the compaction density of the 3T powder is 0.96 g / cm < 3 >-1.10 g / cm < 3 >. The hard carbon negative electrode material for the sodium ion battery has high capacity, high compaction, high magnification and high cycle performance; meanwhile, amorphous carbon is directionally etched through chemical reaction, and a second carbon source is compounded on the basis, so that the crosslinking degree between graphite microcrystals (a structural unit of hard carbon) is improved, open pores are further promoted to be converted into closed pores, sodium storage sites of the closed pores are increased, and the density and conductivity of the hard carbon material are improved; and the capacity, the compaction density, the multiplying power and the cycle performance are improved.

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination reverse osmosis membrane, a preparation method and application. The seawater desalination reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: immersing the prepared support layer into a water phase solution, and then taking out the support layer adsorbing the water phase solution; immersing the support layer adsorbing the water phase solution into a first oil phase solution, and forming a primary reverse osmosis membrane through a first interfacial polymerization reaction; then, taking out the primary reverse osmosis membrane, and carrying out first drying treatment under a steam condition; and immersing the primary reverse osmosis membrane into a second oil phase solution, and carrying out a second interfacial polymerization reaction to form the seawater desalination reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane for seawater desalination in the aspects of reclaimed water reuse, seawater desalination and brackish water desalination. According to the invention, the seawater desalination reverse osmosis membrane which simultaneously meets high desalination rate and high water flux can be prepared.

The invention discloses a thin-layer high-density filler which is prepared by combining an optimized weaving method, weaving density and a bundling mode on the basis of a plain woven wire mesh filler. The novel weaving method enables the weft number of the thin-layer high-density filler to be larger than that of plain woven wire mesh filler under the condition of the same warp number, and the thin-layer high-density filler has the characteristics of high specific surface area, high mass transfer efficiency, low flow pressure drop and the like. A large number of micropores exist on the surface of the thin-layer high-density filler, the wettability is extremely good, the transverse diffusion effect of liquid in the filler can be greatly enhanced due to the fact that the weft density is large, the performance is particularly outstanding in the processes of large-spraying-density rectification and the like, and the pressure drop is about 30%-50% lower than that of a common plain woven filler. The filler provided by the invention mostly adopts stainless steel wires as raw materials, and has the advantages of low cost, large flux, stable performance and low metal exudation rate, so that the filler is difficult to replace in the field of heat pump rectification, high-purity electronic chemical separation, intermediate separation and isomerism separation production.

The invention relates to a membrane electrode and a preparation method thereof and a PEM electrolytic bath, the membrane electrode comprises a proton exchange membrane and functional layers located on the two sides of the proton exchange membrane, each functional layer comprises a gas diffusion layer and a catalyst layer, the catalyst layer is located between the proton exchange membrane and the gas diffusion layer, and the gas diffusion layer and the catalyst layer are each of a porous structure; a conductive structure is arranged between the gas diffusion layer and the catalyst layer, and the conductive structure exists in the form of a layered structure or a dotted structure. According to the membrane electrode disclosed by the invention, the gas diffusion layer and the catalyst layer form a multi-stage porous structure, so that the membrane electrode can reduce the dosage of a catalyst under the same catalytic activity, reduce the material cost of the catalyst and enhance the binding capacity between the catalyst layer and the gas diffusion layer. The conductive structure improves the conductivity of the membrane electrode, reduces the corrosion of the gas diffusion layer in the long-time working process, and improves the bonding performance between the gas diffusion layer and the catalyst layer.

The invention discloses a foam concrete nano foaming agent and application thereof, and belongs to the technical field of concrete materials. The foam concrete nano foaming agent is composed of the following components in percentage by mass: 10-50% of cellulose; 10%-50% of a water-soluble polymer material; 5%-30% of a surfactant; and 5%-30% of nanoparticles. The foam concrete nano foaming agent provided by the invention has the advantages of low cost and good foaming effect. Nano foam generated by foaming of the foaming agent is high in stability, and when the foaming agent is applied to preparation of a foam concrete material, the foam concrete is wide in dry density range and low in collapse rate, has good mechanical properties, flowing properties, dry shrinkage properties, stability and heat insulation properties, and is wide in application prospect. The method is suitable for the fields of building materials, housing construction, road and bridge engineering, cast-in-place backfill engineering, pit goaf backfill, garbage burying and the like.

The invention relates to the technical field of water treatment, and provides gel type imidazolyl anion exchange resin as well as a preparation method and application thereof. According to the method, the gel type styrene-divinyl benzene copolymer is taken as a matrix, and the adsorption selectivity of the gel type imidazolyl anion exchange resin on rhenium / technetium is regulated and controlled by grafting imidazole with alkyl side chains with different lengths, so that the removal rate of rhenium / technetium is increased. The gel type imidazolyl anion exchange resin provided by the invention has relatively high adsorption capacity on ReO4 <-> and TcO4 <->, high selectivity, wide applicable pH value and temperature range, strong acid and alkali resistance and irradiation stability, and wide application prospect.

The invention discloses a beam transportation control system, and belongs to the technical field of nuclear medicine radiotherapy. The control system comprises an energy adjusting system and a beam transport system. The energy adjusting system is composed of a magnet system, an energy reducer system, a beam measuring system, a vacuum system and a water cooling system. The beam conveying system is composed of a magnet system, a beam measuring system, a vacuum system and a water cooling system. The control system of the energy selection section and the control system of the beam section are connected in series to form the whole beam transport control system. According to the system, through compact beam optical design, the number of magnets is greatly reduced, meanwhile, high-quality continuous beams are guaranteed, beam parameters can be accurately controlled, the transmission efficiency and quality are kept, the beam transportation cost is saved, and meanwhile energy consumption is reduced.

The invention belongs to the field of polyurethane materials, and particularly relates to full-bio-based microporous polyurethane foam and a preparation method thereof. According to the invention, rosin acid and castor oil are used as raw materials, and rosin-castor oil polyol is prepared through an esterification synthetic route. The microporous polyurethane foam with excellent mechanical properties is prepared by utilizing the synergistic effect of the bio-based polyol and the rosin-castor oil polyol in a certain proportion. In addition, the microporous polyurethane foam prepared from the vegetable fat and the abietic acid is simple and low in cost, and meets the requirements of green sustainable development.

The invention discloses a porous carbon material and a preparation method and application thereof, the method comprises an activation step of activating a carbonized material, and the activation step comprises placing the carbonized material in a product channel of a split-phase rotary furnace, a basic activation area, a chambering activation area and a supplementary activation area which are sequentially arranged along the advancing direction of the carbonized material are formed in the split-phase product channel; the activation step comprises the step of activating for 80-200 minutes at the temperature of 800-850 DEG C in a basic activation area; activating for 80-120 minutes at the temperature of 850-900 DEG C in a reaming activation area, and then activating for 80-120 minutes at the temperature of 900-850 DEG C; and activating for 60-120 minutes at the temperature of 850-750 DEG C in a supplementary activation area. The porous carbon material obtained by adopting the preparation method has micropores with larger specific surface area and smaller pore diameter, the application range of the porous carbon material is expanded, and the performance of downstream products is favorably improved.

The invention relates to the field of paint coatings, in particular to an anti-fog coating for a vehicle-mounted camera. The anti-fog coating for the vehicle-mounted camera is prepared from the following raw materials in parts by mass: 45 to 60 parts of resin material, 10 to 20 parts of methyl vinyl silicone rubber, 10 to 15 parts of microcapsule, 20 to 35 parts of humidity control powder, 15 to 25 parts of functional filler, 5 to 10 parts of cross-linking monomer, 3 to 5 parts of cross-linking aid, 5 to 8 parts of foaming agent, 3 to 4 parts of antibacterial agent, 2 to 4 parts of ultraviolet-resistant agent, 1 to 2 parts of initiator, 2 to 4 parts of catalyst and 8 to 15 parts of aid. The anti-fog coating for the vehicle-mounted camera, provided by the invention, not only has excellent anti-fog performance, but also ensures good aging corrosion resistance and the like of the anti-fog coating, can ensure the performance stability of the anti-fog coating in a long-term high-temperature and high-humidity environment, avoids the moisture absorption saturation phenomenon of the existing anti-fog coating in the long-term high-temperature and high-humidity environment, and improves the anti-fog performance of the vehicle-mounted camera. Therefore, the anti-condensation effect under the normal use condition is ensured.

The utility model discloses a fisheye flat gasket stamping die which is characterized in that a fisheye extruding station, a punching station, a blanking station and a guide pin mounting station are correspondingly arranged on a concave die plate, a lower base plate and a lower die plate at the lower end part of the die; the female die plate is further provided with a conical rod mounting station and a guide punching rod avoiding station. And a fisheye extruding mounting station, a punching mounting station and a blanking mounting station which are respectively arranged corresponding to the fisheye extruding station, the punching station and the blanking station are arranged on a stripping template and an upper fixing plate at the lower end part of the die. The stripping template is further provided with a conical rod avoiding station, a guide pin avoiding station and a guide punching rod installing station which correspond to the conical rod installing station, the guide pin installing station and the guide punching rod avoiding station respectively. The punching die is high in punching efficiency, the material utilization rate can be remarkably increased, the high precision of the surface parallelism and planeness of the fisheye flat gasket can be guaranteed, and the punching die can be produced in a large scale.

The invention provides a sustainable power generation fiber material based on moisture absorption-evaporation circulation and a preparation method thereof. The method comprises the following steps: S1, preparing a moisture absorption layer; s2, preparing a nanofiber moisture removal layer through an electrostatic spinning technology; s3, preparing an evaporation layer; and S4, the active metal electrode is installed on the moisture absorption layer, the graphite electrode is installed on the evaporation layer, and the sustainable power generation fiber material based on moisture absorption-evaporation circulation is integrated. According to the material prepared by the invention, the three-layer asymmetric fiber structure design of'moisture absorption-moisture removal-evaporation 'and gradually increased electronegativity are utilized, the functions of moisture absorption, sweat releasing and water photovoltaic power generation are realized at the same time, voltage output exceeding 12.5 V can be provided, the material is combined with masks, clothes and the like, the wearing comfort can be met, an energy collection system can be constructed, and the material is suitable for popularization and application. Direct power supply for commercial electronic equipment is realized.

The invention relates to the technical field of rubber foaming materials, and discloses a preparation method and application of a microporous EPDM rubber foaming material. The anti-aging co-crosslinking agent structure contains a multi-maleimide group, which can generate chemical crosslinking with the EPDM rubber, and the crosslinking activity of the molecular chain is enhanced, so that the carbon dioxide dissolved in the matrix is ​​not easy to diffuse out of the matrix, and the nucleation sites are gradually increased, which can support the formation of the pore structure and maintain the integrity of the pore structure, so as to form a dense microporous structure; the imide heterocycle, triazine ring and benzene ring in the anti-aging co-crosslinking agent have strong high temperature resistance. In the rubber vulcanization process, the double bonds are opened to participate in the crosslinking reaction, and free radical active species are formed, which undergo a co-crosslinking reaction with the EPDM rubber, improve the crosslinking network structure, improve the heat air aging resistance and salt spray aging resistance of the EPDM rubber, and enhance the elastic recovery ability of the rubber.

The present application relates to the field of filling glue, and in particular to a high-flowability epoxy resin encapsulated bottom filling glue and a preparation method thereof. The high-flowability epoxy resin encapsulated bottom filling glue, in parts by mass, has the following raw materials: 40 to 60 parts of epoxy resin composition, 10 to 15 parts of active diluent, 20 to 25 parts of curing agent, 1 to 2 parts of accelerator, 20 to 35 parts of modified filler, 1 to 4 parts of coupling agent, 1 to 1.5 parts of leveling agent, and 1 to 3 parts of flame retardant. The epoxy resin encapsulated bottom filling glue prepared in the present application not only has good stress impact resistance, mechanical properties and flow properties, but also can maintain excellent moisture resistance, water resistance, corrosion resistance, acid and alkali resistance and other properties, thereby greatly improving the application performance of the filling glue and having very excellent application prospects.

The invention relates to the field of earmuff products, in particular to a high-flexibility attached earmuff and a preparation method thereof. The high-flexibility attached earmuff structurally comprises an outer protection layer located at the top, a sound absorption layer located in the middle and a flexible layer located at the bottom. The flexible layer is prepared from the following raw materials in parts by mass: 30 to 40 parts of polyether polyol, 20 to 30 parts of polyisocyanate, 5 to 10 parts of a foaming agent, 1 to 2 parts of a catalyst, 1 to 2 parts of a stabilizer, 3 to 5 parts of a flame retardant, 1 to 2 parts of an antioxidant and 5 to 15 parts of a filling agent. The earmuff product prepared by the invention not only has an excellent sound insulation effect, but also can effectively ensure that the earmuff product has good moisture resistance, water resistance, aging resistance, mechanical quality and other properties, and is especially suitable for environments requiring long-time wearing, such as the fields of music production, industrial operation and the like.

The utility model discloses an edible fungus bag opening binding device which comprises a bag opening supporting ring used for supporting a bag opening of an edible fungus bag after the bag opening is turned outwards, a fungus bag sealing cover is detachably assembled on the outer side of the bag opening supporting ring, air holes are formed in the end face penetrating through the fungus bag sealing cover, and a sealing cover splitting device is arranged on the fungus bag sealing cover. In the spawn running period, the fungus bag sealing cover and the bag opening supporting ring are used for binding the opening of the edible fungus bag, ventilation of the edible fungus bag can be achieved through the ventilation holes so that the survival rate of strains can be guaranteed, and after spawn running is completed, part of the fungus bag sealing cover is detached through the sealing cover detaching device so that the bag opening of the edible fungus bag can be exposed to facilitate growth of mushrooms. When the edible mushroom bag is opened, the remaining part of the edible mushroom bag sealing cover and the bag opening supporting ring are still in an assembling state, so that the opening of the edible mushroom bag is regular, the outward turning part of the edible mushroom bag does not need to be fixed for the second time, management complexity in the mushroom planting process is greatly reduced, operation is easy, and labor is saved in use.

The utility model belongs to the technical field of fertilizer processing equipment, and particularly relates to a feeding hopper for organic fertilizer production, which comprises a hopper body, a filter plate is fixedly connected to the upper part of the inner side of the hopper body, and a plurality of first crushing teeth distributed in an array are fixedly connected to the upper surface of the filter plate; a smashing mechanism used for being matched with the first smashing teeth to smash the organic fertilizer raw materials is installed on the filter plate and comprises a motor installed in the center of the lower surface of the filter plate. The filter plate is fixed on the funnel body, the crushing mechanism is mounted on the filter plate and can be matched with the first crushing teeth on the filter plate to thoroughly crush raw materials, blockage is avoided, meanwhile, the discharging branch pipe is communicated with the discharging pipe of the funnel body, the feeding speed of the funnel can be adjusted according to requirements, and the feeding efficiency of the funnel is improved. The problems that at the present stage, a feeding hopper lacks a smashing function, and the feeding speed is inconvenient to adjust are solved.

The invention relates to the technical field of fireproof coatings, and discloses an environment-friendly inorganic expandable fireproof coating and a preparation method thereof.The expandable fireproof coating is prepared from, by mass, 75-145 parts of a ternary aluminosilicate precursor, 60-120 parts of an alkali activator, 5-9 parts of a fiber reinforced material, 15-30 parts of inorganic flame-retardant filler, 8-23 parts of inorganic heat insulation filler and 3.62-11.22 parts of auxiliaries. According to the technical scheme, by utilizing the dual expansion effect of the silica fume and the expandable graphite and the dual foaming effect of the silica fume and the hydrogen peroxide in the alkaline coal gangue and fly ash geopolymer, the prepared fireproof coating has relatively strong porous heat insulation capability under the normal temperature condition; the coating can rapidly expand under a high-temperature condition to generate a porous and firm inorganic heat insulation layer with the thickness of several times or even dozens of times, and the coating is high in fire endurance, excellent in heat insulation performance and not prone to aging.

The invention belongs to the technical field of settlement monitoring, and particularly relates to an automatic soft soil settlement monitoring device and method.The automatic soft soil settlement monitoring device comprises an inclinometer pipe, the inclinometer pipe comprises an inner pipe, the inner pipe is sleeved with an outer pipe, a settlement magnetic ring is slidably arranged in a gap between the inner pipe and the outer pipe in a sleeved mode, and an elastic piece is fixed to the outer wall of the settlement magnetic ring; a through groove allowing the elastic piece to extend out is formed in the outer pipe. The elastic pieces are folded on the inner sides of the through grooves through the binding assemblies; the cut-off assembly is used for releasing the limitation of the binding assembly on the elastic sheet so as to release the elastic sheet and enable the end part of the elastic sheet to extend out of the through groove to be inserted into the inner wall of the monitoring hole; the settlement magnetic ring is placed in the gap between the inner pipe and the outer pipe, the hole diameter of the monitoring hole is reduced as much as possible according to the diameter of the outer pipe, the gap between the outer wall of the inclinometer pipe and the monitoring hole does not need to be backfilled, the working intensity is reduced, detection soil on the hole wall is directly detected, and the monitoring result is more accurate.

The invention discloses an alkaline electrolytic hydrogen diaphragm and a production method thereof, and the production method comprises the following steps: respectively pulping and dispersing PPS fibers with different forms according to a ratio to obtain PPS fibers with different specifications; according to the requirements and the use mode of the electrolytic hydrogen diaphragm, the PPS fibers, the PPS short fiber pulp and the PPS pulp of various specifications are controlled to be added, the PPS fibers, the PPS short fiber pulp and the PPS pulp are proportioned and dispersed according to the content, and auxiliary materials are added in the pulp blending process to achieve the auxiliary effects of dispersing and wet bonding. And then carrying out a short papermaking process to obtain a formed wet film, carrying out vacuum and squeezing dehydration on the papermaking wet film, drying the papermaking wet film in a drying cylinder, carrying out high-temperature hot pressing to form a film, and carrying out hydrophilic modification treatment to obtain the alkaline electrolytic hydrogen diaphragm. The effects of low quantification, high film forming strength, high temperature resistance, alkali resistance, good hydrophilicity, good air tightness and good durability are achieved.

The utility model relates to the technical field of oil cylinder locking, in particular to a high-pressure locking oil cylinder. According to the technical scheme, the high-pressure locking oil cylinder comprises a piston rod, an oil cylinder front cover is arranged on the outer side of the piston rod in a sleeved mode, a one-way valve is arranged in the oil cylinder front cover, and an annular cavity is formed in one end of the one-way valve. And the hydraulic oil in the one-way valve cannot smoothly pass through and flow back into the annular cavity, so that the purpose that the front cover of the oil cylinder does not leak oil is achieved.

The invention discloses a super-smooth anticorrosive coating for an overhead transmission conductor and a preparation method and application thereof.The super-smooth anticorrosive coating for the overhead transmission conductor is prepared from, by mass, 25-50 parts of polyvinyl fluoride resin, 12-50 parts of epoxy resin, 5-10 parts of butyl acetate, 5-10 parts of graphite fluoride, 5-8 parts of molybdenum disulfide, 5-20 parts of superfine aluminum oxide and 6-25 parts of zinc powder. And 1-12.5 parts of zinc phosphate. Surface modification and dynamic coating are carried out on the super-smooth filler particles, so that a layer of chemical inert film is formed on the surface of the filler, and the friction force between the particles and between the particles and a matrix is reduced. Meanwhile, a multi-stage dispersion technology is adopted, low-speed stirring is firstly carried out for primary mixing, and then gradual speed increasing is combined with ultrasonic treatment, so that aggregates of the filler can be fully destroyed, and a stable dispersion state is formed. The treatment can form a highly uniform super-lubricity network structure, improve the interface bonding between the filler and the matrix resin, reduce micropores in the coating and reduce the friction coefficient of the coating, so that the coating shows super-lubricity. And through ultrasonic oscillation treatment, preservative particles reach the nanoscale, the surface area and chemical activity of the particles are increased, the particles and matrix resin form more stable combination, and the anticorrosive effect of the coating is effectively improved.

The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens is sequentially composed of a first fixed lens group with positive focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a diaphragm, a focusing lens group, a compensation lens group with negative focal power and an auxiliary zoom group with positive focal power from the object plane side to the image plane side. The focusing lens group is formed by one lens; the zoom lens satisfies the following conditional expressions: ft / fw > = 60; fnow is less than 3.2; wherein fw is the focal length of the zoom lens in the wide-angle state, ft is the focal length of the zoom lens in the telescopic state, and fnow is the number of apertures of the zoom lens in the wide-angle state. According to the zoom lens, the plurality of mobile groups are arranged, so that a small number of apertures can be realized under the condition that the zoom lens with a large focal length can realize a large magnification, and the brightness of the zoom lens is increased.

The invention relates to the technical field of building roof greening, and discloses a building roof greening and rainwater recycling irrigation system which comprises a microcontroller, a greening module arranged on a building roof, a rainwater recycling module connected with the greening module and an irrigation module. The microcontroller is electrically connected with the greening module, the rainwater recycling module and the irrigation module; the greening module sequentially comprises a water collecting layer, a filtering layer, a protective layer, a pervious concrete layer, a nutrient soil layer and a vegetation layer from bottom to top. The rainwater recycling module comprises a water pumping pipe arranged at the top of the side wall of the water collecting layer and a rainwater recycling box connected with the water pumping pipe; the rainwater recycling box comprises a first filter box, a second filter box, a disinfection box and a clear water box which are sequentially arranged from top to bottom; the irrigation module comprises a first water suction pump connected with the clear water tank, a water outlet pipe connected with the first water suction pump, a water conveying pipe connected with the water outlet pipe, a drip irrigation pipe connected with the water conveying pipe and a water dropper. By means of the system, maximum utilization of rainwater resources and continuous improvement of the ecological environment are achieved.

The invention relates to the technical field of multi-layer fabrics, and discloses a moisture-permeable layered composite fabric and a preparation method thereof. The preparation method comprises the following steps: compounding polyvinylidene fluoride, an antibacterial agent and a solvent, and performing electrostatic spinning to obtain an inner-layer fabric; mixing an epoxy resin / waterborne polyurethane composite material with a beta-cyclodextrin / polytetrahydrofuran ether glycol compound, and performing electrostatic spinning to obtain a middle layer / inner layer composite fabric; and compounding and hot-pressing the middle-layer / inner-layer composite fabric and the outer-layer fabric to obtain the moisture-permeable layered composite fabric. The layered composite fabric has excellent waterproof and moisture permeable properties and good mechanical properties and antibacterial properties.

The luggage case comprises a case body, a mounting hole is formed in the case body, a funnel-shaped air inlet adapter is arranged at the mounting hole, one end of the air inlet adapter is communicated with the inner space of the case body, and the other end of the air inlet adapter is communicated with the outside. According to the principle, when clothes in the box body need to be dried, the output end of the air blower is in butt joint with the air inlet adapter, hot air generated by the air blower is blown into the box body through the air inlet adapter, and due to the fact that the box body is equivalent to a small-sized semi-sealing device, the hot air can automatically circulate in the box body; therefore, the wet clothes can be quickly air-dried within a certain time. The air inlet adapter is arranged at the mounting hole, so that the hole diameter communicated with the outside is smaller, and the influence on the appearance of the box body is smaller; due to the fact that the air inlet adapter is funnel-shaped, the air inlet adapter can be matched with blowers of various diameters, and the sealing performance of the butt joint of the air inlet adapter and the blowers is good.