1554results about How to "Prevent intrusion" patented technology

The invention discloses a communication network power distribution cabinet convenient for heat dissipation, and relates to the technical field of power distribution cabinets, and the power distribution cabinet comprises a composite mechanism. According to the communication network power distribution cabinet convenient to dissipate heat, through the design of a composite mechanism, the box body shell is used for storing electronic components, after long-time operation, the temperature in the box body shell rises, hot gas rises, and then the hot gas flows to the processing mechanism from the circular groove, so that the heat dissipation effect is achieved, and the internal temperature of equipment is reduced; the ventilation mechanisms are arranged on the two sides of the box body shell, so that the convection effect is achieved, the cold air flowing effect is improved, the cold air is located at the low position with the high density, hot air is squeezed upwards after entering the box body shell, the discharging speed is increased, and the heat dissipation efficiency is improved. The box body shell is supported through the supporting assembly, so that the effect of reducing deformation of the box body is achieved, and internal electronic elements are protected.

The invention discloses a hot-rolled high-weather-resistance steel plate with extremely low yield ratio and 850 MPa-grade tensile strength as well as a manufacturing method and application of the hot-rolled high-weather-resistance steel plate. The steel plate comprises chemical components in percentage by weight as follows: 0.06%-0.08% of C, 0.40%-0.60% of Si, 0.40%-0.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 2.50%-3.00% of Cr, 0.25%-0.30% of Cu, 0.13%-0.15% of Ti, 0.020%-0.040% of Alt, smaller than or equal to 0.0040% of N, smaller than or equal to 0.0030% of O and the balance of Fe and inevitable impurities. The high Cr + high Ti design is adopted, the tensile strength reaches 850 MPa, the weather resistance index I value is larger than or equal to 8.0, addition of precious metal Ni is omitted, the addition amount of the strong hardenability element Cr in the steel exceeds 2.50%, a fine grain ferrite and bainite double-phase structure is obtained in combination with the controlled rolling and controlled cooling process, meanwhile, the precipitation strengthening and fine grain strengthening effects of Ti are fully exerted, control over high strength and the extremely-low yield ratio smaller than 0.65 is achieved, and the high-strength and low-yield-ratio steel is obtained. The forming performance is excellent, the corrosion rate is smaller than 40% relative to Q345B, and good atmospheric corrosion resistance is achieved.

The invention provides a multifunctional electric energy metering box, and relates to the technical field of electric energy metering boxes, the multifunctional electric energy metering box comprises an electric energy metering box, communication grooves are formed in two side walls of the electric energy metering box, first inner grooves are formed in the two communication grooves, and first heat dissipation openings and second heat dissipation openings are formed in two side walls of the electric energy metering box; the two second heat dissipation openings are located below the two first heat dissipation openings, an electric energy metering box door is hinged to the electric energy metering box, an observation window and a control panel are arranged on the electric energy metering box door, a containing groove is formed in the side wall of the electric energy metering box, a protective cover is fixedly installed on the side wall of the electric energy metering box, and the protective cover is located over the containing groove. The top of the inner wall of the electric energy metering box is fixedly provided with a fixed box body. The self-adaptive mechanism of the equipment reduces faults caused by overheating or moisture, reduces the maintenance cost, protects electrical elements, ensures the stable operation of the whole system, and improves the reliability and stability of the equipment.

The invention provides an ultrahigh-ductility cement-based composite material for ocean engineering and a preparation method of the ultrahigh-ductility cement-based composite material for ocean engineering. The concrete is prepared from the following raw materials in parts by weight: 250 to 500 parts of cement clinker, 400 to 600 parts of fly ash, 200 to 300 parts of mineral powder, 100 to 150 parts of silica fume, 160 to 240 parts of metakaolin, 600 to 900 parts of quartz sand, 10 to 20 parts of organic synthetic fiber, 20 to 30 parts of organic corrosion inhibitor, 180 to 240 parts of water and 1 to 8 parts of water reducing agent. The organic corrosion inhibitor provided by the invention can be combined with chloride ions to form a passive film, so that the corrosion of reinforcing steel bars and the invasion of the chloride ions into concrete are inhibited, and the durability of the concrete is improved; by regulating and controlling the mixing ratio of the four mineral admixtures and the mixing amount of the synthetic fiber component, the concrete can well consider high strength, high ductility, high durability, high flow state and excellent deformation resistance. The ultrahigh-ductility concrete for ocean engineering, which can meet the toughness requirements of high compression resistance, fracture resistance and impact resistance and the requirements of high chloride ion permeation resistance and steel bar corrosion resistance, can be obtained.

The invention relates to the technical field of concrete preparation, in particular to fiber-reinforced building solid waste recycled aggregate concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, recycled coarse aggregate, slag, fly ash and river sand are mixed and stirred according to the proportion, and a cement mixture is obtained; s2, calcining the cement mixture for 2-3 hours to obtain cement clinker; s3, cement clinker, modified fibers, modified graphene oxide and tetrasodium iminodisuccinate are mixed according to the proportion and then poured into a stirrer to be stirred for 5-6 min; and S4, adding water into the stirrer according to the proportion, continuously stirring for 6-10 minutes, and taking out to obtain the fiber-reinforced building solid waste recycled aggregate concrete. According to the invention, the polystyrene fiber and the concrete are connected more tightly by using the modified fiber, and the polystyrene fiber can be subjected to multiple reactions with components in the concrete in an alkaline environment of the concrete to form a stable network structure, so that mechanical indexes such as crack resistance and breaking strength of the concrete are improved.

The invention discloses a communication and interference integrated base station method and system for a low-altitude safety problem of an unmanned aerial vehicle, and relates to the field of communication, the field of unmanned aerial vehicles and the field of safety supervision, in particular to a method and system for realizing low-altitude wireless signal coverage, including communication signals and interference signals, by using a wireless communication network base station so as to realize low-altitude safety management of the unmanned aerial vehicle. A low-altitude, slow and small unmanned aerial vehicle becomes a main user of a low-altitude airspace in China, but the safety supervision of the flight of the unmanned aerial vehicle in the low-altitude airspace is difficult to realize. According to the method, the interference signal generator function is integrated into the base station (the communication-interference integrated base station), effective coverage of communication / interference signals in the forbidden and limited area can be economically realized through wide deployment of a base station network system, and obvious electromagnetic signal characteristics are given to the forbidden and limited area, so that intrusion of an illegal flying unmanned aerial vehicle is effectively prevented; and meanwhile, management and control of the legal flight networked unmanned aerial vehicle are realized through networking communication, and a technical means of electronic management of low-altitude flight of the unmanned aerial vehicle is provided.

The invention discloses a marine low-temperature concrete additive and a preparation method thereof, and belongs to the technical field of concrete admixtures. The marine low-temperature concrete additive is prepared from the following raw materials: silane / polymer hybrid modified silicon dioxide, anti-freezing fibers, an air entraining and water reducing agent, silica fume, sodium hexametaphosphate and calcium chloride. Through scientific proportioning of silane / polymer hybrid modified silicon dioxide, compound anti-freezing fibers and other components, on one hand, cement matrix interface bonding is enhanced, the integrity of the internal structure of concrete is improved, microcrack initiation in the freezing and thawing cycle process is reduced, and the surface hydrophilicity of the hybrid modified silicon dioxide is enhanced; according to the present invention, by adding the cross-linked polymer, the dispersibility can be improved, the pore structure of the concrete can be optimized, the macroporosity can be reduced so as to reduce the freeze-thaw damage risk and improve the freeze-thaw erosion resistance of the concrete, and the cross-linked network structure is formed in the cement matrix so as to improve the strength and the toughness of the concrete and enhance the freeze-thaw resistance.

The invention provides an external-soft and internal-rigid plugging agent, a preparation method and a water-based drilling fluid, the preparation method of the external-soft and internal-rigid plugging agent comprises the following steps: (1) reacting silicon dioxide with a vinyl-containing silane coupling agent in an ethanol water solution to obtain modified silicon dioxide; (2) mixing the modified silicon dioxide, acrylamide, 2-acrylamido-2-sodium methylpropanesulfonate, sodium p-styrenesulfonate, N, N-methylene bisacrylamide and water, introducing nitrogen to remove oxygen under stirring and heating conditions, and then adding an initiator to react; and (3) filtering, washing and drying the product obtained in the step (2) to obtain the plugging agent with soft outside and rigid inside. The plugging agent can effectively combine the advantages of high strength of a rigid plugging agent and high adaptive capacity of a flexible plugging agent, can adapt to the sizes and shapes of micro-cracks and cracks in a stratum, and effectively plugs pores and cracks in the surface of a well wall.

The invention provides a tantalum-tungsten alloy hot forging machining method. The method comprises the following steps that a tantalum-tungsten alloy prefabricated part is subjected to heat preservation and then subjected to hot forging machining; the tantalum-tungsten alloy prefabricated part comprises a tantalum-tungsten alloy inner core, glass powder and a metal sheath layer from inside to outside; the heat preservation temperature ranges from 900 DEG C to 1400 DEG C. According to the method, heat preservation and hot forging are conducted after the tantalum-tungsten alloy prefabricated part is formed, and in the heat preservation process, the glass powder and the metal wrapping layer effectively prevent oxygen from invading; the glass powder can automatically fall off in the hot forging process, so that the steps of hot forging processing are simplified; through the treatment, oxidation of the large-size tantalum-tungsten alloy in the heating process is prevented, and the boundary dimension and the surface effect of the blank subjected to hot forging have good controllability.

The invention provides a cloud side end toll station traffic flow monitoring method and system based on digital twinning, and relates to the technical field of traffic control, and the method comprises the steps: collecting the actual operation data of a toll station in real time, including the vehicle arrival time, the lane use condition and the equipment state information, constructing a digital twinborn model corresponding to the entity toll station on the cloud server; an edge computing node is arranged at the edge of the entity toll station, processing and anomaly detection analysis are carried out on the actual operation data to obtain a processing result, and the processing result is uploaded to a cloud server; and in the cloud server, the processing result is predicted and analyzed to generate a traffic flow monitoring scheme of the toll station, and the traffic flow monitoring scheme comprises lane opening or closing suggestions, lane proportion adjustment and emergency response measures under special events. Through cooperation of the digital twin technology and the cloud side end, intelligent monitoring and dynamic optimization of the traffic flow of the toll station are realized, and the traffic efficiency and the management level are improved.

The invention provides an ocean engineering anticorrosive coating and a preparation method thereof, and belongs to the technical field of coatings. The coating is prepared from the following raw materials: fluorocarbon resin, modified synthetic mica, modified basalt fibers, modified carbon nanotubes, nano silicon dioxide, nano zinc oxide, nano titanium dioxide, carbon fibers, zinc phosphate, hydroxyl-terminated polybutadiene, a plant extract, organic tin and the like. The modified synthetic mica and the modified carbon nanotubes are modified by adopting pentaerythritol stearate, cellulose nitrate and sodium hexametaphosphate; the modified basalt fiber is modified by adopting sodium stannate, polyvinyl alcohol and sodium hexametaphosphate; the plant extract is ethanol percolation extract of kandelia candel leaves and mangnolia officinalis leaves. All the components are used in a matched mode according to a certain proportion, and the advantages of being excellent in anti-corrosion performance, good in mechanical performance, excellent in anti-aging performance, environmentally friendly and the like are achieved.

The invention provides a vehicle body structure and a vehicle. The vehicle body structure comprises a middle channel, a front anti-collision beam, a first longitudinal beam, a front wall cross beam assembly and a second longitudinal beam. The middle energy absorption structure is located in the frame structure and connected with the front wall cross beam assembly, and in a projection plane perpendicular to the Z direction, the projection of the middle energy absorption structure and the projection of the middle channel are at least partially overlapped; at least the middle portion, located between the first longitudinal beam and the second longitudinal beam, of the front anti-collision beam is a straight section. A middle force transmission channel located between the first longitudinal beam and the second longitudinal beam is built through the middle energy absorption structure, the problem that the first longitudinal beam and the second longitudinal beam cannot directly participate in supporting can be solved under the central column collision working condition, the columnar counterguard is prevented from invading a vehicle, and the safety of passengers in the vehicle is guaranteed; and the front anti-collision beam collides with the obstacle avoidance part through the straight section, so that the situation that the front anti-collision beam invades into the obstacle due to the fact that the structural strength of the front anti-collision beam is too high can be avoided under the MPDB working condition, and it is guaranteed that fatal damage is not caused to the obstacle.

The invention discloses a waterproof heat-insulation flame-retardant multi-component composite material capable of preventing high-temperature scald, which comprises a cylindrical heat-insulation protective material capable of surrounding a local trunk or limbs of a human body in an enclosure shape, and the cylindrical heat-insulation protective material sequentially comprises an outer protective layer, a heat-insulation layer, a breathable transition layer, a heat absorption functional layer and a comfortable inner layer from outside to inside; the heat insulation capability is improved; meanwhile, the comfort is considered.

The invention provides a battery cell structure, an assembly process method of the battery cell structure and a large energy storage battery, the battery cell structure comprises a cover plate and two adapter sheet structures, the cover plate is provided with two pole columns arranged at intervals along the Y direction, each adapter sheet structure comprises a pole column connecting part, the pole column connecting part is provided with a first side, and the first side is provided with a second side; the first side is provided with a cleaning area for cleaning treatment, the cleaning area comprises a welding area and an annular area surrounding the periphery of the welding area, and the welding area is used for welding and fixing the pole connecting part and the pole, so that the welding area is ensured to be in a clean state before welding, welding defects caused by impurities, oxides and the like are avoided, and the welding quality is improved. Therefore, the welding strength and reliability of the pole connecting part and the pole are improved.

The invention discloses a pressurization guarantee cabin for tunnel field command, relates to the technical field of guarantee cabins, and solves the technical problems that in the prior art, movement and walking are inconvenient, and a safety structure for guaranteeing the balance pressure inside and outside a cabin door does not exist. A multi-layer cabin body structure is fixedly installed on the upper wall face of the main machine frame, a peep window is fixedly installed on the front wall face of the multi-layer cabin body structure, and a pressure maintaining porch structure is fixedly installed on the side wall face of the multi-layer cabin body structure. The pressure in the porch pipe and the cabin body is adjusted through the constant pressure machine, internal pressure leakage or external high-pressure gas invasion can be prevented, and the long-term stability of the air pressure environment in the cabin is ensured. The multi-layer cabin body structure enhances the pressure resistance of the cabin body, can bear an external high-pressure or low-pressure environment, and also can prevent accidents such as tunnel collapse from causing physical damage to the structure.

The invention discloses a low-carbon concrete material containing solid wastes and a preparation method of the low-carbon concrete material, and relates to the technical field of concrete materials. The concrete material is prepared from the following components in parts by weight: 520 to 660 parts of a cementing material, 1380 to 1650 parts of aggregate, 1.218 to 1.845 parts of an additive and 25 to 45 parts of other additives, specifically, the cementing material is prepared from 250 to 300 parts of cement, 120 to 150 parts of fly ash, 100 to 130 parts of slag powder, 20 to 30 parts of silica fume and 30 to 50 parts of metakaolin. A large amount of solid wastes are used in the formula, so that the pollution pressure on the environment is effectively reduced by utilizing the wastes; by reducing the use amount of the cement and replacing part of the cement with various solid wastes, the carbon emission in the concrete production process is effectively reduced, and the raw material cost is reduced.

The present invention relates to a weather-resistant and anti-aging polyethylene pipeline and a preparation method thereof, and belongs to the technical field of polymer materials. The pipeline adopts high-density polyethylene resin, linear low-density polyethylene resin, polyimide resin powder, nano silicon dioxide, nano hexagonal boron nitride, polybenzimidazole fiber, carnosic acid, zinc glycyrrhetinate, antioxidant 1010, hindered amine light stabilizer, polydimethylsiloxane titanate cross-linked polymer, 3-methacryloxypropyl triethoxysilane as raw materials; wherein, polyimide resin powder, carnosic acid and zinc glycyrrhetinate are uniformly mixed, and then modified at 300°C to 350°C for 30min to 60min to obtain a modified product, which can better improve the weather resistance and aging resistance of the pipeline. Each component is compatible with each other, and a special modified preparation method is adopted to better play the synergistic effect of the components, and greatly improve the weather resistance and aging resistance of the polyethylene pipeline.

The invention discloses a low-smoke-density high-temperature-resistant halogen-free special flame-retardant optical cable, which comprises a cable core, an inner sheath and a fireproof layer from inside to outside, and is characterized in that the fireproof layer comprises a fireproof layer made of a ceramic silicone rubber material; the cable core comprises optical fibers, a loose tube, a reinforcing piece and an internal flame-retardant thermal insulation layer, the reinforcing piece is located in the center of the cable core, the optical fibers are arranged in the loose tube to form an optical fiber unit and surround the reinforcing piece, the internal flame-retardant thermal insulation layer comprises water-blocking yarn and a calcined mica tape, and the space between the optical fiber unit and the reinforcing piece is filled with the water-blocking yarn. And the optical fiber units, the reinforcers and the water-blocking yarns are wound by the calcined mica tape in a multi-layer and multi-pitch manner. According to the invention, the ceramic silicone rubber material is adopted and is ceramized in a flame state or at a high temperature of more than 500 DEG C to form an oxygen barrier layer, so that a flashover phenomenon in the cable is prevented; ointment is removed from the structure, and the water-blocking yarn and the calcined mica tape are used for blocking water, so that smoke in the combustion process is reduced, and the harm to personnel is less under the condition of fire hazard.

The invention belongs to the technical field of metal part machining equipment, and particularly relates to a metal part welding device which comprises a straight seam welding machine body, a linear driving assembly and a connecting plate, and a fixing assembly is arranged at the left end of the straight seam welding machine body; the welding mechanism comprises a mounting seat mounted on the connecting plate, and a welding head is mounted on the mounting seat; the auxiliary mechanism comprises an air injection part rotationally arranged on the outer ring of the welding head, and a driving part and a cooling part are further fixedly installed on the welding head; and the preheating mechanism comprises a gas conveying part arranged on the side face of the straight seam welding machine body, plugging parts are arranged on the top face of the straight seam welding machine body in an array distribution mode, and a control part is arranged on the mounting base. By integrating inert gas protection, efficient cooling and intelligent preheating functions, the welding quality and production safety are remarkably improved, and meanwhile the high-precision and efficient automatic welding process is achieved.

The low-resistance carrier roller device comprises a carrier roller, a bearing seat and a first sealing assembly, the carrier roller comprises a roller and a rotating shaft, the roller is arranged on the rotating shaft in a penetrating mode, the bearing seat comprises a shell with an opening and a bearing arranged in the shell, one end of the rotating shaft penetrates through the opening and is arranged on the bearing in a penetrating mode, and the other end of the rotating shaft is connected with the first sealing assembly. The first sealing assembly is arranged in the shell and arranged on the rotating shaft in a penetrating mode, the inner circumferential face of the first sealing assembly and the outer circumferential face of the rotating shaft are arranged at intervals in the radial direction of the rotating shaft and are filled with magnetic liquid, and the first sealing assembly is located on the side, close to the opening, of the bearing. The first sealing assembly seals the opening with the magnetic liquid. The low-resistance carrier roller device has the advantages of being low in resistance, small in leakage, long in service life and the like.

According to the steel wire rope composite rope core and the production method thereof, a composite structure composed of the composite core yarn and the outer layer core yarn is adopted, the composite core yarn is formed by weaving the sisal fiber yarn and the jute fiber yarn which have high oil storage performance in a staggered mode, and therefore the composite core yarn has certain strength and toughness, and meanwhile the manufacturing cost is reduced; meanwhile, the outer-layer core wire comprises an outer-layer steel wire layer consisting of outer-layer steel wires and a modified fiber layer consisting of modified PP fiber yarns; the overall strength and tensile strength of the composite rope core are improved by arranging the outer steel wire layer, and the PP fibers with low cost, the PE-based carbon fibers, the polymer polyethylene particles and the graphene are subjected to melt blending to obtain the modified PP fibers, so that the cost is further reduced while the tensile strength of the PP fibers is improved; therefore, the overall tensile capacity and strength of the composite rope core are effectively guaranteed; in addition, by arranging the fiber net layer and the steel wire net layer, the inner core wire structure can be fastened, core wires are prevented from loosening, and the strength of the composite rope core is further improved.

The invention discloses a preparation method of a passivator for a high-rust-prevention aluminum alloy, and belongs to the technical field of rust-prevention materials.The passivator comprises a self-repairing nanocapsule, an environment-friendly corrosion inhibitor, a functional silane coupling agent, inorganic anti-corrosion pigment and an assistant.The self-repairing nanocapsule can form a passivation film with a self-repairing function on the surface of the aluminum alloy, and the passivation film can be applied to the surface of the aluminum alloy; the environment-friendly corrosion inhibitor provides anti-rust performance and biocompatibility, the functional silane coupling agent enhances the adhesive force and weather resistance of a passivation film, the inorganic anti-corrosion pigment serves as a main component of the passivation film to provide excellent anti-corrosion performance, and the passivation agent is applied to the surface of an aluminum alloy in a dipping, spraying, brushing or electrochemical deposition mode. According to the passivating agent, the self-repairing nanocapsule is added to form a layer of passivating film with a self-repairing function and excellent anti-rust performance, the anti-rust performance and durability of the aluminum alloy are remarkably improved through the passivating agent, and the performance is gradually enhanced along with increase of the content of the self-repairing nanocapsule.

The invention provides a fluorine-containing polymer wetting reversal agent suitable for shale reservoir protection as well as a preparation method and application of the fluorine-containing polymer wetting reversal agent. The preparation method of the reverse wetting agent comprises the following steps: adding ethylamine, triethylamine and deionized water into a reaction flask, and adding perfluorooctanoyl chloride into the system for reaction; after the reaction is completed, potassium hydroxide and 2-chloroethanol are continuously added for reaction; and after the reaction is completed, obtaining the N-ethyl-N-hydroxyethyl perfluorooctanamide. Adding nanoparticles, a silane coupling agent and ammonia water into the dispersant solution, and carrying out a modification reaction to obtain a modified nanoparticle solution; and adjusting the pH value of the obtained modified nanoparticle solution to 5-9, adding N-ethyl-N-hydroxyethyl perfluorooctanamide, introducing nitrogen to remove oxygen, adding an initiator, and carrying out thermal initiation polymerization reaction to obtain the composite material. The wetting reversal agent disclosed by the invention has excellent wetting reversal performance and a certain filtration reduction effect, and provides innovative thinking for development of a high-performance water-based drilling fluid technology.

The utility model relates to the technical field of projection equipment, in particular to a projector, which comprises a shell, and a projection assembly, an air uniformizing structure and a cooling fan which are arranged on the shell, a containing cavity is formed in the shell, an air duct inlet communicated with the containing cavity is formed in the shell, and the projection assembly is arranged in the containing cavity; the air inlet end of the air uniformizing structure is connected with an air outlet of the cooling fan, and the air outlet end of the air uniformizing structure is connected with the air channel inlet. According to the projector provided by the embodiment of the invention, the air uniformizing structure is arranged between the cooling fan and the air duct inlet, so that airflow blown by the cooling fan passes through the air uniformizing structure and then enters the accommodating cavity of the shell to dissipate heat of the internal projection assembly, thereby enabling the airflow entering the accommodating cavity to be distributed more uniformly; the problem of poor local heat dissipation effect caused by non-uniform distribution of heat dissipation airflow in the existing projector can be effectively solved.

The present invention discloses a high-precision smart meter for outdoor use, which belongs to the technical field of smart meters. The following scheme is proposed, which includes a smart meter body, heat dissipation structures are arranged on both sides of the smart meter body, an air intake structure is detachably installed on the heat dissipation structure, the smart meter body and the air intake structure can be detachably installed inside the meter box, an adjustment component and a pushing component for driving the adjustment component are arranged inside the air intake structure, and a driving component for adjusting the pushing component is arranged on the smart meter body; by arranging the air intake structure, the adjustment component and the pushing component, if the connecting hole is configured in a ⊥ shape, the external natural wind will be effectively guided to the inside of the wind collecting cover, and then smoothly flow into the inside of the installation shell through the air intake duct and the conduit, so as to implement uniform and effective air cooling and heat dissipation on the side wall of the smart meter body, thereby significantly improving its operating stability and ensuring the high precision of the smart meter body during operation.

The invention discloses an intelligent park security risk perception system and method with prediction capability. The method comprises the following steps: acquiring face feature data registered at a park entrance guard; collecting video data of T monitoring areas of the park in real time; real-time face feature data in the video data appearing in the tth monitoring area is extracted, the real-time face feature data is compared with registered face feature data, the comparison result comprises the existence of a garden entry record and the absence of the garden entry record, and the real-time face feature data without the garden entry record is marked as abnormal personnel features; setting a deliberate avoidance area of each monitoring area in advance; using a tracking algorithm to track the abnormal personnel with the abnormal personnel characteristics, recording deliberate avoidance areas where the abnormal personnel characteristics appear in the q monitoring areas, marking the deliberate avoidance areas as passing avoidance areas, and sequentially connecting all the recorded passing avoidance areas to form an action track of the abnormal personnel; and the safety risk perception capability of the park is improved.

The invention relates to a terminal identity authentication method based on an identity label password, which comprises the following steps: step 1, during identity registration, collecting user voice through a mobile terminal to establish an identity vector voiceprint model, extracting features, adding an identity label to generate a user ID, and generating a corresponding identity password system; and 2, during authentication, judging the legality of a user according to voice recognition, and encrypting and decrypting data based on an identity password and a symmetric encryption algorithm AES to realize terminal identity authentication so as to resist common attacks in the mobile internet. According to the invention, the capability of identifying illegal users and the capability of resisting network hostile attacks are greatly improved.

The utility model discloses a small handheld refrigeration fan, which relates to the technical field of handheld fans and comprises a handle, an outer cover component and a fixed outer cover component, the outer cover component and the fixed outer cover component are in threaded butt joint and are rotatably arranged at the top of the handle, and an outer sleeve is slidably sleeved on the outer wall of the handle; storage grooves are formed in the outer wall of the periphery of the bottom end of the handle, a supporting plate is rotationally arranged in each storage groove, and the outer cover assembly comprises an outer ring in butt joint with the fixed outer cover assembly. The fan in a non-use state is sealed and protected through the outer cover assembly, data lines, key pendants and other objects are prevented from entering a satchel in the carrying process of the satchel, or the situation that long hair of girls invades and is wound is prevented, the practicability of the handheld fan is further improved, meanwhile, the supporting plate capable of being folded and stored is utilized, and the handheld fan is convenient to use. The fan is more convenient to hold by hand or stand on a table top, and the situation that the base is lost does not need to be worried about.

The invention provides a fresh tilapia mossambica block preservative and a preparation method thereof, the fresh tilapia mossambica block preservative comprises the following raw materials: natural plant extract, modified biological polysaccharide, organic acid, natural antibacterial peptide, a humectant, deionized water and the like, and propolis extract and astaxanthin can be selected to enhance the effect; wherein the natural plant extract is corncob, zingiber mioga and tartary buckwheat bran extract; the modified biological polysaccharide is obtained by modifying chitosan quaternary ammonium salt, laminarin, cell wall polysaccharide and carboxylic acid. The fresh-keeping agent is prepared through ultrasonic mixing, multilayer electrostatic deposition and other technologies, through the synergistic effect of all the raw materials, a multilayer coating structure is formed through electrostatic deposition, microbial growth can be inhibited, gas exchange can be controlled, water loss can be reduced, the fresh-keeping period of tilapia mossambica blocks can be effectively prolonged, and the quality of the tilapia mossambica blocks can be kept.

The utility model discloses a fixing device of a monitoring image module, relates to the technical field of monitoring, and solves the technical problem that an existing monitoring image module is inconvenient to mount and dismount. The device comprises a base, fixing assemblies are installed on the two sides of the base, and a monitoring image module is installed above the base; the fixing assembly comprises an L-shaped plate, a sliding rod, a limiting block, a pull rod and a spring, one end of the L-shaped plate is fixedly installed on one side of the base, a through hole is formed in the other end of the L-shaped plate, the sliding rod penetrates through the through hole, the limiting block is fixedly installed at the end, close to the base, of the sliding rod, and the pull rod is fixedly installed at the end, away from the base, of the sliding rod; one end of the spring is fixedly connected with the limiting block, the other end of the spring is fixedly connected with the L-shaped plate, and the limiting block is inserted into the monitoring image module. According to the utility model, the fixing and dismounting of the monitoring image module are realized, the flexibility during the installation of the monitoring image module is increased, and the operation is convenient and fast.