268results about How to "Achieve absorption" patented technology

The invention provides a multilayer metal medium metamaterial wave absorber and a 3D printing manufacturing method thereof.The multilayer metal medium metamaterial wave absorber comprises a plurality of structural units arranged in rows and columns, and each structural unit comprises a metal base and a plurality of hollow square ring-shaped metal-medium composite layers stacked up and down; the metal-medium composite layers are sequentially and vertically stacked on the metal base according to the side length sequence, and the sizes of the metal-medium composite layers are sequentially decreased from bottom to top. Compared with the prior art, the multi-layer metal medium metamaterial wave absorber has a high-efficiency wave absorbing effect in an ultra-wide frequency band; and the medium material and size can be flexibly selected, and the 3D printing additive manufacturing technology is utilized for manufacturing, so that the processing difficulty and the manufacturing cost are reduced.

The sound absorption body is characterized in that the sound absorption body comprises a light source, a flexible cover plate and at least one sound absorption body back cavity, a channel connected with the outside of the sound absorption body back cavity is formed in the sound absorption body back cavity, the flexible cover plate can cover the opening area of the channel, the flexible cover plate comprises a CNT-Nafion / PE double-layer driver, and the CNT-Nafion / PE double-layer driver is connected with the light source. The light of the light source can drive the CNT-Nafion / PE double-layer driver to deform and enable the channel to be opened or partially opened. According to the invention, the light-actuated CNT-Nafion / PE double-layer driver is used as a flexible panel, the light-actuated CNT-Nafion / PE double-layer driver can cover the opening area of the surface of the channel in a non-illumination state, the driver is deformed after illumination, and the opening of the channel is exposed, so that the sound absorption frequency band of the back cavity of the sound absorber can be adjusted.

The invention discloses a lightweight sound-insulation aerated concrete block and a preparation method thereof, and relates to the technical field of aerated concrete blocks. The polypropylene fibers are blended into the aerated concrete at a low mixing amount, so that the overall performance of the concrete is remarkably improved, the concrete is endowed with a new acoustic characteristic, and the polypropylene fibers have a unique physical property and a distribution mode; a structure similar to a natural or artificial fabric is formed in a pore network of the aerated concrete, when sound waves pass, tiny vibration of fibers can be induced, then the sound waves interact with surrounding pore walls, friction and energy conversion are generated, mechanical energy of the sound waves is effectively converted into heat energy in the process, and the sound waves can be effectively absorbed by the aerated concrete. The absorption and weakening of sound waves are realized, so that a remarkable sound absorption effect is shown.

The invention discloses a perovskite-based visible-near infrared photoelectric detector array and a preparation method thereof. The perovskite-based visible-near infrared photoelectric detector array comprises a substrate, an up-conversion particle / perovskite heterostructure and an electrode layer, wherein the up-conversion particle / perovskite heterostructure is arranged on the substrate; the heterostructure comprises a perovskite layer arranged on the substrate, the perovskite layer is composed of a plurality of perovskite micro-nanowires in one-dimensional linear arrangement, and an up-conversion material layer wraps the two transverse sides of the perovskite micro-nanowires from the side wall to form an up-conversion particle / perovskite structure; the absorption spectrum of the up-conversion material comprises a near-infrared band, and the emission spectrum is partially or completely matched with the absorption spectrum of the perovskite layer material. The detector array widens the absorption range of the perovskite to the near-infrared band under the condition that the inherent visible band detectability of the perovskite is not influenced, the up-conversion material absorbs near-infrared light and emits light in the visible band, the light can be effectively absorbed by the perovskite and generates electron hole pairs, and the photoelectric conversion efficiency is improved. Energy absorption and detection of the perovskite-based photoelectric detector from a visible spectrum section to a near infrared spectrum section are realized.

The invention relates to an auxiliary brick paving robot and an auxiliary brick paving method, and the robot comprises a suction cup butt joint module which is provided with a suction cup used for adsorbing bricks; the vehicle body can move in all directions; the horizontal lifting arm is supported above the vehicle body in a horizontal swinging manner, the swinging tail end of the horizontal lifting arm is connected with a lifting machine, and the lifting tail end of the lifting machine is provided with a third butt joint structure detachably connected with the suction cup butt joint module; the turnover mechanism comprises a suction cup turnover module and a turnover driving mechanism, the suction cup turnover module is connected to the vehicle body in a turnover mode and located in the moving range of the third butt joint structure, the turnover driving mechanism is installed on the vehicle body and used for driving the suction cup turnover module to conduct turnover motion, and the suction cup turnover module is detachably connected with the suction cup butt joint module. According to the brick overturning device, feeding, moving and automatic overturning of bricks can be achieved, and the physical labor of workers is greatly reduced.

The invention discloses a method for reducing deformation of an aircraft skin co-curing plate, the aircraft skin co-curing plate comprises 1-4 wave-absorbing prepreg layers and 8-15 structural prepreg layers which are sequentially laid on the surface of a tool from bottom to top, and 1-4 flexible buffer layers are laid between the wave-absorbing prepreg layers and the structural prepreg layers. And then the wave-absorbing prepreg layer, the flexible buffer layer and the structural prepreg layer are cured and formed through a curing process. By additionally arranging the flexible buffer layer, deformation independently generated by co-curing of the wave-absorbing prepreg or the structural prepreg can be buffered, so that the deformation of the whole plate is reduced under the condition that the temperature resistance of the wave-absorbing prepreg is not changed; the flexible buffer layer is reserved along with curing extrusion in the curing process, and it can be guaranteed that the temperature resistance of the whole plate is basically unchanged; by controlling the thickness of the flexible buffer layer, the specific wave band absorption performance is improved, and the positive progressive significance is achieved for production and manufacturing of the invisible skin.

The invention is applicable to the technical field of wastewater treatment, and provides an intelligent oil-removing and filtering device for oil-producing wastewater, which comprises a treatment box, a water inlet pipe, an oil absorption assembly, a water discharge pipe, a filter plate and a coherent discharge assembly. Waste water is introduced into the treatment box from the water inlet pipe and stands, oil and water in the waste water are layered, the oil-water separation effect can be achieved through the oil absorption assembly, the oil absorption position can be accurately controlled by the oil absorption assembly according to the water content, oil can be completely absorbed, and residual oil is prevented from flowing into subsequent procedures. After oil absorption is completed, the continuous discharging assembly can filter the wastewater, the flowing direction of the wastewater can be adjusted through the continuous discharging assembly, it is guaranteed that the wastewater can flow out and be filtered through the other side, at the moment, the filter plate can be replaced, the smoothness of wastewater filtering is guaranteed, working procedures do not need to be interrupted, and use is more convenient; and the continuous discharge assembly can automatically change the fixed state of the filter plate when the flow direction is adjusted, so that the operation is more convenient.

The invention discloses a method for removing thiocyanate radicals in cyanide-containing wastewater, and belongs to the technical field of metal refining. The method comprises the following steps: adding concentrated sulfuric acid to adjust the pH value of cyanogen-containing wastewater to 2-3, carrying out a stirring reaction, filtering, adding sodium hydrosulfite into a filtrate, simultaneously adding concentrated sulfuric acid to maintain the pH value to 3-5, carrying out a stirring reaction, firstly introducing a sodium sulfite acidic solution into overflowed H2S and HCN gas to absorb H2S gas, and then introducing a sodium hydroxide strong alkaline solution to absorb HCN gas. Aiming at cyanide-containing wastewater subjected to acidification treatment, firstly, a strong reducing agent sodium hydrosulfite is added to reduce SCN <-> into H2S and HCN with recycling value, then H2S is absorbed, elemental sulfur is recovered, finally HCN is absorbed, CN <-> is recovered, and the method is used for cyaniding gold extraction of a gold leaching system. The absorption and separation of H2S and HCN gas are realized, the recovery of elemental sulfur and CN <-> is further realized, and other ions are not introduced into a water supply system.

The invention discloses an ex-situ mixing remediation device for agricultural heavy metal contaminated soil. The ex-situ mixing remediation device comprises a box body as well as a crushing mechanism, a drying mechanism, a receiving mechanism, a spraying mechanism and a mixing mechanism which are sequentially arranged in the box body from top to bottom, the pair of drying mechanisms is arranged on the side wall of the box body in a mirroring mode, and the pair of bearing mechanisms is arranged on the side wall of the box body in a mirroring mode. Through the stirring mechanism and the swing mechanism arranged in the mixing and stirring mechanism, a good remediation effect can be achieved during mixing and stirring of soil and remediation liquid medicine; firstly, a stirring machine can swing and mix through a stirring arm and an adjusting arm when a main shaft rotates, and meanwhile, a scraping plate can lift soil on the bottom layer to the top layer to complete replacement and mixing; exchange and mixing of soil between the two stirring mechanisms can be achieved through the swing mechanism; furthermore, the material crushing mechanism can complete effective material crushing for the soil with relatively high viscosity, so that the defect that the clayed soil is easy to extrude into cakes by using a conventional crushing roller crushing mode is overcome.

The utility model discloses a plate cutting machine with a deburring function, which relates to the field of plate cutting and comprises a support, a conveying belt is arranged at the top end of the support, a clamping device is arranged on one side of the top of the conveying belt, and a baffle device is arranged on one side of the top of the conveying belt. A noise reduction box connected with the support is arranged on one side of the top of the conveying belt, an electric box fixing plate is arranged on one side of the noise reduction box, a distance adjusting device matched with the noise reduction box is arranged on the top of the electric box fixing plate, and a rotating disc device is arranged at the bottom of the distance adjusting device. A control panel is arranged on one side of the conveying belt. The distance adjusting device and the rotating disc device are arranged, the distance between the rotating disc device and the surface of the conveying belt is adjusted according to the thickness of the acoustic board, and meanwhile the acoustic board is cut, deburred and dedusted through the rotating disc device.

The utility model discloses a cleaning device for glass production and processing, which relates to the technical field of glass processing, is used for solving the problem that the existing cleaning device for glass production and processing cannot thoroughly remove raised dust, and comprises a workbench, a support rod, a clamping device, a glass body, a vertical rod, a cross rod, a first sliding block, a motor and a cleaning brush, a glass body is clamped and fixed between the clamping devices, the output end of a motor is connected with a cleaning brush, the side portion of the bottom end of a first sliding block is fixedly connected with a bearing plate, the top of the bearing plate is fixedly connected with a storage box, the bottom end of the storage box is connected with a metal pipe in a penetrating mode, the metal pipe penetrates through a through hole, and the middle of the metal pipe is connected with an air suction pump. The bottom end of the metal pipe is fixedly connected with a suction hopper, and the suction pump and the suction hopper are installed in the device, so that dust raised during cleaning can be sucked, the dust is prevented from falling onto glass again, and the cleaning effect is guaranteed; meanwhile, the respiratory organ of an operator can be prevented from being damaged.

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 relates to a 5G module power supply, and relates to the field of electrical equipment, the 5G module power supply comprises a main body, the main body is provided with a shell, a heat dissipation coil pipe is arranged in the shell, a temperature sensor is arranged on the inner wall of the shell, the heat dissipation coil pipe is tightly attached to the main body, the shell is provided with a heat dissipation grid, and the side, close to the main body, of the heat dissipation grid is provided with a heat dissipation fan; the heat dissipation coil pipe extends towards one side of the heat dissipation fan and comprises heat dissipation fins, and the heat dissipation fins are located between the heat dissipation fan and the heat dissipation grating. The temperature in the shell is detected through the temperature sensor, when the temperature rises, the heat dissipation fan is started to blow air on the outer side into the shell through the heat dissipation grid, the heat dissipation coil pipe dissipates heat of the main body and conveys the heat to the heat dissipation fins, heat dissipation of the heat dissipation fins and the heat dissipation coil pipe is achieved through the heat dissipation fan, and the heat dissipation efficiency is improved. And the heat dissipation coil pipe is kept at a low temperature, and the effect of heat dissipation of the main body in the shell is effectively achieved.

The invention relates to the technical field of wave-absorbing metamaterials, in particular to a lattice element sequential wave-absorbing metamaterial and a preparation method thereof.The wave-absorbing metamaterial comprises a substrate and a lattice structure layer, and the lattice structure layer is formed by arranging a plurality of structure units on the surface of the substrate in a periodic array mode; each structural unit is formed by arranging a plurality of dot matrix elements; the dot matrix elements are sheet-shaped magnetic dot matrix elements. The wave absorbing crest of the dot matrix superstructure moves towards high frequency, and RLlt; and the effective absorption bandwidth of-10dB is improved. The wave-absorbing strength and bandwidth are improved, and the problem that an existing homogeneous wave-absorbing coating is difficult to have the characteristics of small thickness and light weight while the bandwidth is improved is solved.

The utility model discloses a special dedusting platform for medium plate groove cutting, which relates to the technical field of medium plate cutting dedusting and comprises an air duct assembly, a workpiece support frame and a dedusting host. According to the special dust removal platform for groove cutting of the medium and heavy plates, through cooperative use of the air duct assembly, the dust removal main machine, the air cylinder and the air suction opening baffle, the air duct assembly surrounds the outer side of the workpiece supporting frame of the special dust removal platform for groove cutting of the medium and heavy plates, and the air duct assembly communicates with the dust removal main machine through a communicating pipe and a pipeline connector; when medium and thick plates are cut, the dust removal main machine is started synchronously, directional air beams are generated in the air duct assembly, an air cylinder in the pneumatic opening and closing module works and drives an air suction opening baffle to move, opening and closing adjustment is conducted according to the working position of the cutting gun head, the air volume of the dust removal main machine is adjusted, and smoke generated in the cutting process is absorbed; and the dust collection effect of the special dust removal platform for groove cutting of the medium plate is ensured.

The invention provides a metamaterial broadband microwave absorber which comprises a metal bottom plate and a dielectric layer located above the metal bottom plate, and a plurality of semiconductor periodic structure units are periodically laid and arranged on the upper surface of the dielectric layer; each semiconductor periodic structure unit comprises a segmented ring-shaped structure and a cross-shaped structure which are connected with each other; the segmented circular ring structure comprises at least three segmented circular rings which are concentrically arranged and have different radiuses; each segmentation circular ring is divided into four arc pairs which are symmetrically distributed by a cross-shaped structure; the metal bottom plate is made of a conductive metal material; the dielectric layer is made of an insulating electrolyte material; and the product of the thickness and the conductivity of the semiconductor periodic structure unit is a fixed value. By adopting the metamaterial absorber, the problems of narrow band and polarization sensitivity in the existing metamaterial absorber can be relieved.

The invention belongs to the technical field of electromagnetic functional materials, and particularly relates to a hexagonal element sequential wave-absorbing metamaterial and a preparation method and application thereof. Superstructure design is carried out on the surface of the wave-absorbing coating with intrinsic electromagnetic loss, a superstructure wave-absorbing coating for carrying out structural loss on electromagnetic waves is obtained, the superstructure wave-absorbing coating is attached to the metal matrix layer, and the hexagonal element sequential wave-absorbing metamaterial is obtained. The hexagonal primitive sequential wave-absorbing metamaterial breaks through the Rogov limit, solves the problem that a traditional homogeneous wave-absorbing material is limited in the aspects of increasing the bandwidth and reducing the thickness, breaks through the limitation that the thickness and the bandwidth cannot be met at the same time, achieves efficient wave-absorbing and stealth compatibility under the deep sub-wavelength size, and improves the wave-absorbing efficiency. And the thickness of the super-structure wave-absorbing coating is reduced to 2mm, so that practical engineering application is facilitated, and the super-structure wave-absorbing coating can be applied to the fields of communication and national defense.

The invention relates to a high-entropy oxide wave-absorbing ceramic powder material as well as a preparation method and application thereof, belongs to the technical field of electromagnetic wave absorbing materials, and solves the problems of poor high-temperature resistance and oxidation resistance and low absorption efficiency on low-frequency wave bands of an existing electromagnetic wave absorbing material. The high-entropy oxide ceramic material has a perovskite structure, the molecular structure is ABO3, A comprises La and Sr, and B is at least five elements of Cr, Ni, Mn, Fe, Co, Zr, Hf and Ti. According to the invention, the high-entropy oxide is combined with the perovskite structure, the electromagnetic function of the high-entropy oxide ceramic material is accurately regulated and controlled, and effective absorption of low-frequency electromagnetic waves is realized; the material has oxidation resistance and thermal stability under a high-temperature condition, and excellent electromagnetic function strength of the material at a high temperature is maintained. According to the high-entropy oxide ceramic powder material, the range of an electromagnetic wave absorbing material is widened, the environmental adaptability is improved, and higher requirements of development of a communication technology on the electromagnetic wave absorbing material are met.

The invention provides an anti-collision cross beam assembly of a vehicle forecabin, a vehicle body assembly of a vehicle and the vehicle. The anti-collision cross beam assembly of the vehicle forecabin comprises a first anti-collision cross beam, a first energy absorption box, a second anti-collision cross beam and a second energy absorption box. The first anti-collision cross beam is located above the second anti-collision cross beam in the height direction of the vehicle, the first anti-collision cross beam is located on the front side of a vehicle body longitudinal beam of the vehicle in the length direction of the vehicle, and the first energy absorption box is used for being connected between the first anti-collision cross beam and the vehicle body longitudinal beam; the second anti-collision beam and the second energy absorption box are both located on the front side of an auxiliary frame assembly of the vehicle in the length direction of the vehicle, the second anti-collision beam and the second energy absorption box are arranged in a staggered mode in the height direction of the vehicle, and the second anti-collision beam is connected with one end of the second energy absorption box through an anti-collision supporting piece. And the other end of the second energy absorption box is used for being connected with an auxiliary frame assembly, so that the collision force absorption effect of the anti-collision beam assembly is improved.

The invention belongs to the technical field of selenium-rich blueberry planting, and particularly relates to a selenium-rich blueberry cultivation method which comprises the following steps: S1, selecting a proper variety according to climate conditions of a planting field; s2, selecting a place with loose soil, rich organic matters and good drainage for planting; s3, the selected soil is subjected to impurity removal, and meanwhile protection facilities are built around the soil; s4, planting pre-selected high-quality nursery stocks in the planting furrows or holes between autumn without drought in winter and early spring germination; the invention innovatively proposes that in the early stage, the middle stage and the later stage of selenium-rich blueberry growth, the selenium absorption of blueberry leaves is realized by accurately spraying an inorganic selenium solution. And the cost is low. Meanwhile, the selenium content of the blueberries is rapidly increased. According to the method, the problems of enrichment nonuniformity and low absorptivity possibly caused by soil selenium application are solved. Therefore, the selenium content of the selenium-rich blueberries is greatly increased, and the overall quality and yield of the blueberries are remarkably improved.

The utility model relates to an automatic workpiece carrying and stamping production line which comprises a control panel, a feeding machine used for automatically taking, placing and straightening workpieces, a stamping machine used for stamping the workpieces, a receiving belt conveying line used for conveying the workpieces and a material frame used for storing the workpieces. The swing arm manipulator is used for transferring a workpiece of the feeding machine to one stamping machine, transferring a workpiece of the stamping machine to another stamping machine or transferring a workpiece of the stamping machine to the receiving belt conveying line; the material frame is positioned at an outlet of the receiving belt conveying line; according to the production line, automatic carrying and automatic punching of the workpieces and automatic straightening of the positions of the workpieces are achieved, the requirement for manual operation is reduced, and the production efficiency is greatly improved. The automatic operation process can effectively save time and labor cost, and the overall efficiency of the production line is improved.

The utility model discloses a data security storage device, relates to the technical field of data storage, and solves the technical problems that an existing device cannot well store a single hard disk, and data is lost and data security cannot be guaranteed due to the fact that the existing device is possibly affected by vibration and impact in the moving and carrying process. The device comprises a shell, damping layers and a fixing assembly, the damping layers are arranged on the upper wall and the lower wall in the shell, a storage box is arranged between the damping layers in a sliding mode, the storage box comprises a box body, the fixing assembly is arranged in the box body and comprises a fixing rod, one side of the fixing rod is connected with the side wall of the box body, and the other side of the fixing rod is connected with the side wall of the box body. A first pressing rod is arranged in the fixing rod in a sliding mode, the upper side and the lower side of the first pressing rod are connected with second pressing rods in a sliding mode, and the hard disk fixing device has the advantages of being capable of guaranteeing data safety of a hard disk, convenient to use and the like.

The invention discloses an antibacterial and anti-ultraviolet polyester master batch and a preparation method thereof, relates to the technical field of polyester resin, and aims to improve the antibacterial performance and the anti-ultraviolet performance of a polyester material, an antibacterial and anti-ultraviolet intermediate is prepared and added into the polyester material; according to the preparation method, a guanidyl structure with antibacterial performance and benzophenone and triazine ring structures with anti-ultraviolet performance are introduced into an antibacterial and anti-ultraviolet intermediate, so that the anti-ultraviolet performance of the antibacterial and anti-ultraviolet intermediate is improved, and the antibacterial and anti-ultraviolet intermediate reacts with ethylene glycol and other raw materials; therefore, an antibacterial and anti-ultraviolet structure is introduced into a polyester chain segment, the antibacterial performance and the anti-ultraviolet performance of polyester are enhanced, and the use performance of a polyester material is improved.

The utility model discloses a heat discharging device for a textile workshop, which comprises an air exhaust device, a heat dissipation device and a heat dissipation device, the filter plate is arranged on the mounting seat; the cleaning device is arranged on the mounting base, a reciprocating lead screw is rotatably arranged on the mounting base in the height direction of the mounting base, a power device for driving the reciprocating lead screw to rotate is arranged on the mounting base, and the cleaning device comprises a scraping roller matched with the reciprocating lead screw; the scraping device is arranged on the mounting seat; the scraping device comprises a scraping plate which is arranged in the mounting seat and is matched with the scraping roller; the linkage device is used for driving the pushing plate to move and pushing away impurities on the scraper when the reciprocating lead screw rotates. Heat generated by the spinning frame in the spinning workshop can be discharged, and impurities can be effectively prevented from influencing the safety and the efficiency of heat discharging equipment during discharging, so that the heat discharging device is convenient to use actually.

The single-basket feeding machine comprises a machine body, a bearing basket, a conveying mechanism, a material taking mechanism, a correcting mechanism and a detecting mechanism, the bearing basket is connected with the machine body, and the bearing basket is used for containing workpieces; the conveying mechanism is connected with the machine body and used for conveying workpieces. The material taking mechanism is connected with the machine body, and the material taking mechanism transfers workpieces located in the bearing basket to the conveying mechanism. The correcting mechanism comprises a moving assembly and correcting columns, the moving assembly is arranged on the conveying mechanism, the multiple correcting columns are arranged, and the moving assembly drives the multiple correcting columns to clamp the side edge of the workpiece; the detection mechanism is connected with the conveying mechanism, and the detection mechanism detects the distance between the detection mechanism and a workpiece located on the material taking mechanism. According to the workpiece transfer device, a workpiece can be positioned during workpiece transfer, and the conditions of displacement and deflection of the workpiece in the transfer process are reduced.

The invention discloses a preparation method of modified phenolic resin for radioactive waste oil solidification, and relates to the technical field of nuclear radioactive waste treatment.The preparation method comprises the steps that phenolic resin obtained through base catalysis is modified; preparing a lead-based metal organic framework; adding the prepared lead-based metal organic framework into dimethylformamide to obtain a lead-based metal organic framework suspension; 1-5 g of modified phenolic resin is weighed and added into 20-50 mL of methyl alcohol, and a modified phenolic resin solution is obtained; slowly pouring the lead-based metal organic framework suspension into the methanol solution of the modified phenolic resin, and stirring the mixed solution for 30-60 minutes by using a magnetic stirrer, so that the lead-based metal organic framework is uniformly dispersed in the phenolic resin solution to obtain a lead-based metal organic framework-modified phenolic resin solution; the modified phenolic resin material provided by the invention not only can solidify waste oil, but also can play a role in adsorbing radioactive isotopes, and can effectively prevent leakage of radioactive waste oil.

The present invention provides an absorption-type balanced filter power divider with arbitrary transmission zero point, which relates to the field of communication technology and is constructed on a printed circuit board, comprising: a microstrip unit, a dielectric substrate and a metal ground arranged in sequence from top to bottom; a first absorption network, a first low-pass filter unit, a second absorption network, a second low-pass filter unit, a third low-pass filter unit, a third absorption network and a fourth low-pass filter unit are integrated on the microstrip unit, and the first absorption network, the first low-pass filter unit, the second absorption network, the second low-pass filter unit, the third low-pass filter unit, the third absorption network and the fourth low-pass filter unit are sequentially connected end to end to form a closed loop. The technical solution of the present invention overcomes the problems in the prior art that the common mode noise reflected by the balanced port cannot be absorbed and the suppression effect on unnecessary frequency bands is poor.

The present invention discloses a multifunctional poultry breeding feeding device, which relates to the technical field of poultry breeding, and comprises a base, a placing mechanism for feeding different poultry at the same time, a driving mechanism for driving the placing mechanism to work, and an automatic feeding mechanism for automatically refilling the placing mechanism. The water feeding box and the feeding box of the existing feeding device are structurally improved, so that the feeding device can meet the feeding needs of poultry with different feeding habits of chickens and ducks without adding an additional feeding area. Secondly, after the feeding is completed, water and feed can be separated, so as to facilitate the next chicken to eat, and avoid the feed being soaked in water for a long time, resulting in water pollution. The scientificity of feeding is improved while the environmental protection is improved. At the same time, after a feeding cycle, the feeding can be automatically stopped, thereby increasing the functionality of the device.

The utility model discloses a fireproof acoustic board not easy to fall off, and relates to the technical field of acoustic boards, the fireproof acoustic board comprises a frame body, the interior of the frame body is of a hollow structure, cover plates are arranged on the two sides of the frame body, and a polyester fiber board, a foam board, a silencing board and a waterproof impermeable board are sequentially arranged in the frame body; a decorative layer is arranged on one side of the frame body, and the frame body is connected with the cover plate through bolts. The fireproof acoustic board is reasonable and reliable in structure, installation of various laminates is achieved through the frame body, it can be guaranteed that after the acoustic board is used for a long time, the laminates cannot fall off due to failure of the bonding strength, durability of the acoustic board is guaranteed, and meanwhile the fireproof acoustic board is not prone to falling off. The fireproof performance of the acoustic board can be improved through the arrangement of the fireproof coating, when a fire occurs, the coating can effectively prevent flame from spreading, the acoustic board is safer and more reliable when the fire occurs, and therefore the building structure and personnel safety are protected.

The invention relates to a monomer material containing a benzisoxazole structure, a conjugated polymer composite material, a preparation method and an application. The monomer material and the polymer thereof have a benzisoxazole unit structure, and benzisoxazole has relatively strong electron withdrawing capability, so that benzisoxazole is suitable for being used as an A unit in a D-A copolymerization type donor, and can be copolymerized with different D units to respectively obtain polymer donors with wide band gaps and medium band gaps; the monomer material and the polymer thereof have a strong rigid conjugate plane, and can form a polymer film with highly ordered and high carrier migration characteristics through pi-pi supramolecular interaction, thereby ensuring that the polymer film has good carrier mobility. Due to the characteristic, filling factors of the polymer solar cell can be improved, different acceptor materials can be matched, a photovoltaic active layer with complementary light absorption is obtained, effective absorption and utilization of sunlight are achieved, and light current is improved.