199results about How to "Reduce spread" patented technology

The invention relates to the technical field of plastic forming, and discloses a plastic leftover material forming process of a layered compaction structure, which comprises the following steps: S1, raw material pretreatment: selecting a new plastic material meeting performance requirements, drying, mixing with pretreated recycled material particles in proportion, uniformly stirring, and feeding into a raw material storage tank for later use; s2, melting and injection molding: feeding the mixed raw materials into an injection molding machine, heating in different areas through a charging barrel, and stirring and melting into a melt through a screw rod; the die set is arranged, through an immediate leftover material separation and recovery system, the cut leftover materials can be rapidly recycled, soil and water pollution caused by leftover material accumulation is avoided, meanwhile, waste of plastic raw materials is reduced, and the development concepts of green manufacturing and circular economy are met. Due to the sealing protection design of the die set, pollution caused by melt leakage is avoided, and diffusion of dust and harmful gas is reduced through the sealing structure of the movable groove.

The utility model belongs to the technical field of textile dust collection, and particularly relates to a textile machine textile dust collection device which comprises a bearing table. Moving wheels are rotationally connected to the side wall of the bearing table. The moving wheels are symmetrically arranged on the side wall of the bearing table; the top of the bearing table is fixedly connected with a dust collection box; collecting holes are formed in the side walls of the moving wheels; the collecting holes are formed in the side wall of the dust collecting box in a circular array mode. An inner box is fixedly connected to the interior of the collecting hole; a collecting hole is also formed in the side wall of the inner box; a filter screen is mounted on the side wall of the inner box; by means of the structure, spinning dust can be effectively collected from different angles and positions, diffusion of the spinning dust in a workshop is reduced to the maximum extent, the high-performance dust suction fan can generate strong negative pressure suction force, a large amount of spinning dust generated in the spinning process can be rapidly sucked away, and the collection efficiency is greatly improved compared with a traditional device.

This invention discloses a portable low-temperature plasma device based on a Laval nozzle structure and its application, belonging to the field of plasma technology application technology. Specifically, it includes (1) the construction of the device; and (2) the use of the device for fungal eradication treatment and transdermal drug delivery enhancement treatment. The beneficial effects achieved by this invention are as follows: This invention is the first to apply the Laval nozzle structure to a portable low-temperature plasma device. The results show that the device can effectively improve the plasma jet performance and active particle content, significantly improve the treatment effect of fungal infections of the skin and nails and the transdermal drug penetration efficiency, while solving the problems of large size, reliance on external power supply, and complex operation of traditional plasma devices. Therefore, using this invention for the treatment of fungal infections of the skin and nails and for enhanced transdermal drug delivery has advantages such as ease of operation, high safety, non-invasiveness, and high efficiency, and thus has potential application prospects in the field of skin disease treatment and transdermal drug delivery.

The utility model relates to a kind of closed liquid adding device, it includes: it includes: sealed bucket, its lower part is provided with faucet, its top is detachably provided with bucket cover;Pad is set on the bottom of the sealed bucket, and let slot is set on it;Flexible liquid storage bag is fixedly set on the pad by magic tape component, the upper portion of the liquid storage bag is provided with transfer component for and raw material bucket detachably connected to carry out liquid filling, the bottom of the liquid storage bag is provided with liquid outlet pipe for and the faucet detachably connected, to discharge the liquid in liquid storage bag by the faucet, the liquid outlet pipe is placed in the let slot.Polyethylene plastic bucket pouring has reduced toxic gas overflow and diffusion, cause medical staff eye and respiratory mucosa exposure risk, guarantee the physical and mental health of medical staff.

The utility model belongs to the technical field of seat, disclose a kind of multilayer fire -retardant noise absorption seat backplate, including backplate body, the backplate body is made of five layers structure composite, the backplate body includes abrasion -resistant fire -retardant surface layer, perforated sound-absorbing layer, soundproof layer, damping layer and support backplate that are sequentially arranged, each layer is integrally formed by hot pressing, the abrasion -resistant fire -retardant surface layer is located outermost layer.The utility model can effectively block external fire source and delay flame spread by abrasion -resistant fire -retardant surface layer, perforated sound-absorbing layer and soundproof layer can efficiently absorb medium-high frequency noise by micro-perforation resonance and porous sound-absorbing, and damping layer further inhibits structural vibration energy transmission, solve the problem that traditional seat backplate is insufficient in fire -retardant and single in noise absorption means.

The utility model provides a kind of high-temperature-resistant long-life ball bearing retainer, it is related to bearing retainer technical field, and it includes: hold frame body;The retainer body is annular structure, and ball hole is arranged in annular array shape on the inner wall of retainer body;Annular array shape is arranged in the through hole of the outer wall of retainer body, and the through hole is circular hole structure, and the through hole arranged in annular array shape is jointly composed of the heat dissipation structure of retainer body.Utilize nickel-based alloy high melting point (1300 DEG C above) and strong oxidation resistance, so that retainer is not easy to heat softening or oxidation corrosion failure under high temperature working condition (such as industrial kiln, aeroengine), directly prolongs the service life under high temperature environment;Through type circular through hole forms three-dimensional heat dissipation channel, cooperates the forced convection of lubricating medium (oil / gas), and internal heat is quickly taken away.For example in high-speed motor, airflow passes through through hole can make retainer temperature reduce 20%~30%, avoid local overheating to cause material failure.

The utility model belongs to the technical field of pipeline backfilling, and discloses a hydraulic flat plate vibration compaction device for pipeline backfilling modification, which comprises a bottom plate, a replacement structure, a hydraulic motor, a lower connecting seat, a fixing frame and a dustproof structure, the replacement structure is arranged at the bottom end of the bottom plate, the hydraulic motor is arranged at the top end of the bottom plate, and the lower connecting seat is arranged on the replacement structure. A hydraulic motor is installed on the bottom plate, an eccentric wheel box is installed on one side of the hydraulic motor, the other side of the hydraulic motor is connected with an oil pressure pipeline, lower connecting bases are fixed to the two sides of the top end of the bottom plate, and shock absorption dampers are installed at the top ends of the lower connecting bases. The problems that flying dust is generated, the air quality is reduced, the air becomes turbid, meanwhile, the urban environment becomes dirty, messy and bad, and the overall image of a city and the living quality of residents are affected due to the fact that the device needs to strike the earth surface soil for a long time are solved.

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 provides an epoxy resin with a super-hydrophobic layer and a preparation method thereof, and relates to the technical field of polymer insulating materials.The preparation method of the epoxy resin with a super-hydrophobic layer comprises the following steps: surface activation of a substrate: treating the surface of the cured epoxy resin substrate with plasma or alkali to introduce hydroxyl groups; constructing a silane anchoring layer; constructing a conductive inhibition layer; constructing a micro-nano rough structure layer: forming a micro-nano rough structure on the surface of the conductive inhibition layer by spraying or dipping nanoparticles; low surface energy modification; the super-hydrophobic performance of the epoxy resin is excellent: through the cooperation of the micro-nano rough structure and the fluorosilane low surface energy modification layer, the water contact angle is greater than or equal to 150 degrees, the rolling angle is less than 10 degrees, the formation of a water film on the surface can be significantly inhibited, and the adhesion and spreading of water in a humid environment are reduced; the wet-state insulation performance is greatly improved: the conductive inhibition layer introduces a large number of charge traps and prolongs the charge migration path.

The utility model discloses a plywood cutting device which comprises a cutting table, the upper surface of the cutting table is fixedly connected with a fixing frame, a dust collector is installed on the upper surface of the fixing frame, a sliding dustproof cover is arranged in the fixing frame, and the outer surface of the sliding dustproof cover is fixedly communicated with a first dust collection pipe. Symmetrical adjusting plates are fixedly connected to the outer surface of the sliding dustproof cover, two springs are fixedly connected to the upper surface of each adjusting plate, and the top end of each spring is connected with the inner wall of the fixing frame. According to the plywood cutting device, a cutting mechanism driven by a motor is adopted, a positioning plate and an adjusting mechanism are combined, accurate positioning and stable cutting of plywood can be achieved, and the accuracy of the cutting size is ensured; and wood chips and dust generated in the cutting process can be effectively collected, dust diffusion is reduced, and the machining environment is improved.

The utility model belongs to the technical field of separation, and particularly relates to a storage tank for separating trace chlorobenzene in hydrochloric acid, which comprises a storage tank body, a liquid receiving tank is connected below the storage tank body, a chlorobenzene drainage port is arranged at the bottom of the liquid receiving tank, an inner cavity of the storage tank body is communicated with an inner cavity of the liquid receiving tank, and a feed port is arranged at the top of the storage tank body. An inserting pipe is arranged in the feeding port, the bottom of the inserting pipe extends to the bottom of an inner cavity of the storage tank body, a baffle is vertically arranged in the storage tank body, the lower end and the two sides of the baffle are connected with the inner wall of the storage tank body, and a gap is reserved between the upper end of the baffle and the top of the storage tank body; the liquid receiving groove and the inserting pipe are located on the same side of the baffle, and a hydrochloric acid discharging opening is formed in the side, away from the liquid receiving groove, of the baffle and located in the bottom of the storage tank body. The storage tank can effectively separate out trace chlorobenzene in hydrochloric acid, the purity of hydrochloric acid is improved, and efficient separation is achieved.

The application discloses a kind of multistage synergic covalent grafting type hydrolysis-resistant self-cleaning PET submarine cable monofilament and preparation method, the monofilament includes three parts of core layer, skin layer and surface layer, the core layer is the high viscosity polyethylene terephthalate resin containing carbodiimide anti-hydrolysis agent;Skin layer is the modified PET resin of functional polysiloxane covalent grafting, wherein the functional polysiloxane has epoxy end group or isocyanate end group, and main chain has Si-H group;Surface layer is the fluorine-free low surface energy layer formed by polyvinyl long side chain alkane polysiloxane and residual Si-H group in skin layer through hydrosilylation reaction.The application significantly improves the durability of monofilament in humid heat environment, so that it is suitable for long-term humid heat service environment such as marine cable and industrial fabric, and can maintain stable mechanical strength and self-cleaning performance for a long time.

The application provides a road wrecker, which comprises a vehicle body, a fire extinguishing cover arranged on the vehicle body, a bottom end of the fire extinguishing cover being open and capable of being buckled on a road surface to form a closed space for accommodating a failure vehicle in the fire extinguishing cover, the closed space comprising a parking chamber and a cleaning chamber distributed upward and downward, a heat exchange assembly arranged on the fire extinguishing cover, a lifting mechanism for lifting the failure vehicle into the parking chamber, an isolation mechanism for isolating the parking chamber from the cleaning chamber, a cleaning mechanism for cleaning the ground buckled by the fire extinguishing cover, and a water storage assembly arranged on the vehicle body. The application can effectively reduce the risk of fire spreading, effectively prevent the flame and heat from spreading to surrounding vehicles or combustible materials, and significantly reduce the direct emission of toxic gas and smoke generated by battery combustion into the atmosphere due to the closed property of the fire extinguishing cover. In addition, the fire extinguishing wastewater containing harmful substances generated in the fire extinguishing process is limited in the cleaning chamber inside the fire extinguishing cover.

The utility model relates to a high-voltage plastic shell isolation switch. The high-voltage plastic shell isolation switch comprises a contact assembly and an arc extinguishing assembly. The contact assembly comprises a fixed contact and a moving contact, the fixed contact is fixedly arranged, the moving contact can be movably arranged relative to the fixed contact, and the moving contact and the fixed contact are electrically connected when being in contact; the arc extinguishing assembly comprises an arc extinguishing shell and gas generating parts, an arc extinguishing space is arranged in the arc extinguishing shell, the moving path of the moving contact is located in the arc extinguishing space, the two gas generating parts are located in the arc extinguishing space and arranged at intervals, the static contact and the moving contact are located between the two gas generating parts, and the spacing distance between the two gas generating parts is 8-12 mm. According to the scheme, when the moving contact and the static contact are disconnected, the exhaust speed is increased, airflow is equally divided, arc extinguishing is efficient, and then zero flashover is achieved.

The utility model relates to the technical field of detection module, especially for the multimode detection module for vehicle lithium battery, including multispectral imager, two multispectral imager respectively are established in the top both sides of metal frame, the inside of metal frame is equipped with a plurality of battery group, the inside of battery group is equipped with a plurality of electric core, the top of electric core is pasted with fiber bragg grating sensor, the top of battery group is equipped with three NTC film thermocouple. The support rod in the device is obliquely installed on both sides of the metal frame, which can optimize the viewing angle of the two multispectral imagers, so that the battery group can be fully covered to eliminate dead angles. The hydrogen sensor is embedded in the contact side of the battery group, which can capture combustible gas leakage in real time to speed up the early warning. The design of the protective shell can provide physical protection for the electric core and ensure the surface of the NTC film thermocouple to measure temperature. The three NTC film thermocouples are distributed on the top front, middle and back of the protective shell, which can monitor the temperature gradient and accurately locate the overheating.

The application discloses an ultrafiltration membrane for sewage treatment and a preparation method thereof, and relates to the field of membrane separation technology. The method comprises the following steps: firstly, ZnO@PHEMA-Ag nanoparticles are prepared, and the nanoparticles are pretreated, modified, grafted and loaded with silver nanoclusters; then, maleic anhydride grafted PVDF and modified MXene are prepared; then, a composite casting solution is prepared, and the solution is cast into a film and then immersed into a polyvinyl alcohol coagulation bath containing dimethylformamide to form a film; finally, the finished ultrafiltration membrane is obtained through ultraviolet crosslinking post-processing. The ultrafiltration membrane has excellent anti-pollution performance through functional nanoparticles, substrate modification and process optimization.

The application provides an amphiphilic carbon dot, a rapid dispersion ultra-stable foam system and a preparation method thereof, and belongs to the field of oil field chemistry, wherein the preparation method of the amphiphilic carbon dot comprises the following steps: dissolving cholic acid in a first solvent to obtain a hydrophobic phase precursor solution; dissolving chitosan oligomer in a second solvent to obtain a hydrophilic phase precursor solution; mixing the hydrophobic phase precursor solution and the hydrophilic phase precursor solution in a closed reactor, standing for 5-10 min, and performing phased microwave treatment: 180-220 W for 1-3 min, 450-550 W for 2-5 min, and 80-120 W for 4-8 min; cooling the reaction liquid to room temperature, and obtaining the amphiphilic carbon dot through filtration, dialysis and freeze-drying. Through the synergistic effect of the amphiphilic carbon dot and the surfactant, the application can realize rapid dispersion to form uniform foam, and can maintain the stability of the foam in a high-salt environment for a long time, thereby meeting the application requirements in a high-salt scene.

The utility model discloses an aluminum honeycomb core composite board which comprises a composite board body, the composite board body is formed by combining an outer layer, a fireproof coating, a structure reinforcing layer, a first core layer, a first fireproof layer, a second fireproof layer, an inner layer, a waterproof layer, a second core layer and a bottom layer, the fireproof coating is fixedly connected to the lower surface of the outer layer, and the structure reinforcing layer is fixedly connected to the lower surface of the inner layer. Through the components, the composite board body is provided with multiple layers of fireproof and waterproof layers, ceramic treatment can be carried out at high temperature, a hard fireproof barrier is formed, double high temperature resistance can be achieved, flames and heat are prevented from permeating inwards, heat radiation can be reflected, and fire spreading can be delayed; the surface hydrophobicity of the composite board body can be high, the composite board body is resistant to rainwater corrosion, and the composite board body can still keep stable when exposed outdoors or in a humid environment for a long time.

The utility model discloses a wooden floor processing grinding and polishing machine which comprises a grinding and polishing shell, supporting plates are arranged at the front end and the rear end of the interior of the grinding and polishing shell, a wooden floor conveying belt is arranged between the two supporting plates, grinding and polishing rollers are arranged at the upper end of the interior of the grinding and polishing shell respectively, and the wooden floor processing grinding and polishing machine further comprises a wood chip collecting mechanism. And the wood chip collecting mechanism comprises dust collecting covers, dust suction pipes and brushing rollers, the dust collecting covers are arranged between the upper surfaces of the two supporting plates correspondingly, and the grinding and polishing rollers are rotationally connected between the front inner walls and the rear inner walls of the dust collecting covers through first rotating shafts correspondingly. According to the wood flour collecting device, wood flour generated during grinding and polishing of the wood floor is collected in a centralized and multi-directional mode, compared with a single dust collection mode, diffusion of the wood flour to the outside can be reduced, wood flour collection is more comprehensive, residues of the wood flour on the surface of the wood floor are reduced, follow-up machining is facilitated, and the quality of the wood floor machining environment is improved.

The utility model discloses a kind of for wind power blade polishing device, it is related to polishing device technical field.The utility model includes placing table, and the placing table provides stable support base for integral equipment, further include polishing mechanism, and the polishing mechanism is set on placing table top.The utility model is through setting dust collection component, specifically in the process of rotating shaft rotation will be through driving gear to drive several driven gears to rotate together, in the process of several driven gears rotation will be through several impellers rotation to produce powerful airflow to make dust hood inside present negative pressure state, at this time dust generated in the process of polishing disc polishing is inhaled into dust hood inside, reduce dust height dispersion, and diffuse in the whole working environment, to reduce the influence to operator's vision, reduce working difficulty and risk, also reduce dust to spread to surrounding environment, reduce the influence to surrounding environment.

The invention relates to an intelligent spraying robot operation control method, device and equipment for a target part and a medium, and the method comprises the steps: extracting a mean value of current insect situation indexes of an insect situation density field of each pesticide application sub-region, so as to determine an insect pest grade of each pesticide application sub-region, and distributing a corresponding insect pest grade quantized value, converting the quantized value of the insect pest level into target pesticide application amounts through a linear mapping function, calculating a spatial centroid coordinate of each pesticide application sub-region, taking the spatial centroid coordinates as pesticide application operation points of the pesticide application sub-regions, and constructing a pesticide application region set containing a plurality of pesticide application operation points and the corresponding target pesticide application amounts in the target planting region; a K nearest neighbor algorithm is adopted to carry out space path optimization sorting on the pesticide application area set, an optimal operation sequence is generated, and spraying pesticide application is carried out on each pesticide application sub-area based on the optimal operation sequence until pesticide application operation of each pesticide application sub-area is completed. According to the application, the pest control effect can be remarkably improved, and the defect of one-step spraying is avoided.

The utility model discloses a kind of ultra-thin smart cards, including smart card;The upper end of the smart card is provided with a through-hole, the smart card is composed of chip, film layer, silica gel sheet, printing layer and protective layer, the film layer is attached on both sides of chip, the silica gel sheet is attached on the outside of film layer, the printing layer is attached on the outside of silica gel sheet, the protective layer is attached on the outside of printing layer.The silica gel sheet of the utility model has good flexibility and elasticity, is attached on the outside of film layer, can utilize its elastic buffer external impact force to smart card, reduce the damage caused to internal chip due to collision, extrusion etc., also make the whole smart card more flexible, meet the characteristic requirement of ultra-thin.

This invention relates to the field of cable protection conduit technology, specifically a flame-retardant and impact-resistant protective conduit for communication and power cables. The conduit includes a flame-retardant structure comprising an outer tube layer, the inner wall of which is fitted with a heat-resistant outer tube. An impact-resistant protective structure is provided on the inner wall of the inner mounting layer, including a cable mounting bracket outer tube located on the inner wall of the inner mounting layer. One end of the outer tube layer has a conduit interface structure. This flame-retardant and impact-resistant protective conduit for communication and power cables exhibits significant flame-retardant effects, effectively preventing flame spread, avoiding pipe combustion and dripping, and effectively absorbing impacts from external collisions and compression. It can withstand various external impacts such as outdoor construction, vehicle collisions, and heavy object compression. Furthermore, it improves splicing and connection efficiency, is suitable for large-scale cable laying projects, and can significantly shorten the construction cycle.

This invention relates to a membrane-free static alkaline zinc-iron battery. On one hand, this invention utilizes a vacuum filtration method to deposit high-specific-surface-area carbon material with a specific concentration gradient into the electrode. The adsorption of ferricyanide ions by the carbon material ensures that the active material generated during charging is mainly concentrated at the bottom of the electrode, reducing self-discharge caused by ferricyanide ions diffusing to the negative electrode and reacting directly with zinc. On the other hand, it utilizes the magnetic property of ferricyanide by applying an external magnetic field to the membrane-free static alkaline zinc-iron battery. The magnetic field induces ferricyanide ions, reducing their diffusion to the negative electrode. Through these methods, a high-efficiency membrane-free static zinc-iron battery is constructed.

The utility model discloses a hydro-pneumatic spring with a heat dissipation function, and belongs to the technical field of hydro-pneumatic springs. The device comprises a hydro-pneumatic spring body, a floating piston, a one-way check valve, a cooler and a pipeline system. The floating piston achieves oil-gas isolation, the main piston divides an inner cavity of the cylinder body into a center cavity and an annular cavity, and the center cavity and the annular cavity are communicated through a piston rod damping oil channel and an external pipeline. The core innovation is that in the active cooling circulation, in the compression stroke, hot oil in a central cavity is pressed out, is forcibly guided into an external cooler through a one-way check valve to be cooled, and then is injected into an annular cavity; and in the stretching stroke, the oil flows back to the central cavity through the damping hole. By means of the structure, a double heat dissipation mechanism combining cylinder barrel convection radiation heat dissipation and oil liquid replacement convection heat dissipation is formed, the limitation that a traditional hydro-pneumatic spring only relies on a cylinder body for heat dissipation is broken through, the temperature of oil liquid and gas can be actively and efficiently controlled, temperature rise is remarkably restrained, and sealing reliability and system work stability are guaranteed.

The present application belongs to the technical field of construction fence, and in particular to a trencher construction protective fence, which comprises a fence plate, a plurality of sound absorption holes are formed on the outside of the fence plate, a sound collection groove is formed in the inside of the fence plate, and the plurality of sound absorption holes are in communication with the sound collection groove; the plurality of fence plates are arranged to build the trencher construction protective fence, the sound absorption holes are in communication with the sound collection groove, the arc-shaped plate inner wall absorbs noise, the noise absorption and noise reduction effect is achieved, the plurality of pulleys at the bottom ends of the plurality of sliding plates rotate to realize the displacement effect of the fence plate, the first rotating plate and the second rotating plate rotate in the fixed frame and are respectively clamped in the first fixed block and the second fixed block to fix, the height of the baffle is limited, the first guide plate and the second guide plate are guided and matched to guide the noise to the inside of the sound absorption plate for absorption, and the diffusion of noise pollution is reduced.

The utility model discloses an aerogel felt post -treatment frock, including bearing frame body, install hydraulic telescopic mechanism on the bearing frame body, the lower extreme of hydraulic telescopic mechanism is connected with U type steel, both sides of U type steel all are fixed with fixed plate, both sides of the lower extreme of U type steel all are fixed with connecting plate, the upper end middle part of U type steel is installed with joint, both sides of joint all are connected with first fixed pipe. The utility model discloses can promote the sufficiency and comprehensiveness of adsorption to the upper end and both sides adsorption and lift adjustment of aerogel felt, can adapt to different specifications aerogel felt adsorption simultaneously, can guarantee the microstructure integrity of aerogel felt to improve the overall quality of product, prolong the service life of equipment, improve the reliability and stability of production equipment, reduce the flying and diffusion of nanometer particles in production environment, be favorable to the improvement production workshop's working environment, protect the health of operator.

The invention discloses a magnetic shielding structure for solving the influence of a magnetic back splint on the natural performance of a wearable terminal, and particularly relates to the technical field of wearable device.The magnetic shielding structure comprises a magnetic base and a magnetic clamping cover, and further comprises a fixing assembly installed on the upper portion of the face, close to the magnetic clamping cover, of the magnetic base; the back cover is installed on the back face of the magnetic attraction clamping cover, a first containing cabin is arranged in the middle of the magnetic attraction clamping cover, and a second containing cabin is arranged in the middle of the magnetic attraction base; every four of the eight magnetic shielding mechanisms form a group, and the eight magnetic shielding mechanisms are symmetrically arranged in the first containing cabin and the second containing cabin respectively. According to the magnetic shielding structure for solving the influence of the magnetic back clip on the natural performance of the wearable terminal, the magnetic shielding mechanisms with the magnetic shielding covers are symmetrically arranged in the accommodating cabins of the magnetic clip cover and the magnetic base, the cylindrical magnetic shielding covers are utilized to form an approximately-totally-closed shielding space, a magnetic field generated by a magnet is concentrated in the shielding space, and the magnetic shielding performance of the wearable terminal is improved. And outward diffusion of the magnetic field is greatly reduced.

This application provides a TOPCon solar cell with improved leakage current and its fabrication method, relating to the photovoltaic field. After phosphorus diffusion, a patterning process is performed on the front edge and central axis of the silicon wafer using a laser, followed by acid washing and alkali washing to obtain an alkali-washed silicon wafer. An Al2O3 thin film is prepared on the front surface of the alkali-washed silicon wafer using plasma ALD, followed by annealing to form an Al2O3 layer. SiO2 is then prepared on the surface of the Al2O3 layer using plasma ALD. x N y Layer; SiH4, CM4 and CH3M gases are introduced, and ALD is used on SiO2. x N y SiN layer surface x M layer; M is a halogen element, SiN x Halogen elements in the M layer move along the path close to SiO₂ x N y One side of the layer to the side away from SiO x N y The content gradient on one side of the layer decreases; electrode printing, sintering, and light injection are performed to obtain TOPCon solar cells with improved leakage current. This can reduce recombination loss and leakage current.

The application discloses layered composite lead-free relaxor ferroelectric material and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics, and overcomes the defects that the strain excited by the lead-free relaxor ferroelectric material in the prior art is small under a low driving electric field. The layered composite lead-free relaxor ferroelectric material comprises a first relaxor ferroelectric layer, a ferroelectric layer and a second relaxor ferroelectric layer arranged in sequence; and in the layered composite lead-free relaxor ferroelectric material, 0 < ferroelectric layer mass percentage < 30%. The application provides the layered composite lead-free relaxor ferroelectric material which has low driving electric field and large strain.