53results about How to "Extended propagation path" patented technology

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell assembly and a photovoltaic system.The solar cell comprises a silicon substrate, the silicon substrate is provided with a backlight face and a light facing face which are oppositely arranged, a plurality of grid lines and a plurality of microarrays are arranged on the backlight face side by side in the first direction, and the grid lines extend in the second direction; the microarray comprises a plurality of arranged microstructure units, an included angle is formed between the microarray and the grid line, and the first direction is crossed with the second direction; the length of the silicon substrate in the second direction is L, the range of the two side edges, parallel to the first direction, of the silicon substrate extending towards the center line by L / 9 is an edge area, the included angle in the edge area is alpha, the included angle in the area close to the position of the center line is beta, and the angle of alpha is larger than that of beta. The absorption path of light in the silicon wafer is increased, the diffuse reflection effect of reflected light of backlight surfaces in different areas is promoted, and therefore the absorption efficiency of the light is improved.

The invention belongs to the technical field of vehicle-mounted communication, and relates to a transmitting end and a receiving end of a vehicle-mounted communication system, the vehicle-mounted communication system and a method. A multi-antenna base station constructs a mapping relation between index bits and a reflection array element group and between the index bits and a transmission array element group by using a generalized spatial modulation technology, modulates the index bits and information bits to obtain target to-be-transmitted signals, and transmits the target to-be-transmitted signals and carrier signals; the omnidirectional intelligent metasurface transmits a target signal to be transmitted to the demodulator, and carries out modulation coding on a carrier signal based on a reflection phase offset control signal and a transmission phase offset control signal generated by the controller. A reflection signal matrix and a transmission signal matrix are generated and transmitted; a demodulator demodulates a target signal to be transmitted to obtain index bits and information bits; the controller divides a plurality of array element groups of the omnidirectional intelligent metasurface into a reflective array element group set and a transmission array element group set based on the index bits, and generates a reflective phase offset control signal and a transmission phase offset control signal based on the information bits.

The invention provides a crystalline silicon solar cell with high conversion efficiency and a preparation process thereof, and belongs to the technical field of solar cell preparation. The preparation process comprises the following steps: pretreating a crystal silicon wafer; preparing a bionic micro-nano composite film; preparing a composite structure on the surface of the silicon wafer; preparing the glass powder doped with the phosphorus-doped graphene; preparing a positive electrode conductive slurry; and preparing the crystalline silicon solar cell. The CuS nanocrystals / quantum dots are deposited on the surface of the bionic micro-nano composite film, the effects of antireflection, passivation and sensitization of the silicon wafer can be achieved, the photoelectric conversion efficiency of the battery is further improved, the CuS nanocrystals / quantum dots are deposited, the absorption range of the silicon wafer to the optical wavelength can be increased, and the photoelectric conversion efficiency of the battery is improved. Meanwhile, one absorbed photon can be converted into a plurality of photon-generated carriers through the CuS quantum effect, and the photoelectric conversion efficiency of the cell is improved.

The embodiment of the invention provides an optical module and a near-to-eye display device. The optical module comprises a waveguide substrate, a coupling-in grating, a first collimating element, a second collimating element and a coupling-out grating. The coupling-in grating is arranged on one side of the waveguide substrate. The first collimating element is arranged on the side, away from the coupling-in grating, of the waveguide substrate or the side, away from the waveguide substrate, of the coupling-in grating. The second collimating element is arranged on the side, away from the waveguide substrate, of the first collimating element. The coupling-out grating is arranged on the waveguide substrate. A light beam can penetrate through the waveguide substrate and is transmitted to the first collimating element, the light beam emitted from the first collimating element is reflected by the second collimating element, and the light beam emitted from the second collimating element is transmitted to the first collimating element, is coupled into the waveguide substrate through the coupling-in grating, is transmitted in the waveguide substrate, and is coupled out through the coupling-out grating. The first collimating element and the second collimating element are used for collimating the light beam. According to the technical scheme, the size of the near-to-eye display equipment is reduced.

The invention discloses a film bulk acoustic resonator with a side cavity and a filter. According to the thin film bulk acoustic wave resonator, an effective resonance area is formed by an overlapping area of an acoustic mirror, a bottom electrode, a piezoelectric layer and a top electrode in the thickness direction of the resonator, and a side face cavity with an irregular edge shape is formed outside the effective resonance area, so that originally concentrated transverse acoustic waves are dispersed, the propagation path of the original transverse acoustic waves is prolonged, and the acoustic effect is improved. And the strength of the transverse parasitic mode is weakened, so that the parasitic mode of the film bulk acoustic resonator is effectively inhibited, and the quality factor of the device is improved.

The invention relates to a multilayer special-shaped section sound absorption material and a preparation method thereof. The multilayer special-shaped section sound absorption material comprises a special-shaped layer, a bottom layer and a plurality of supporting assemblies evenly distributed between the special-shaped layer and the bottom layer. The supporting assemblies, the special-shaped layer and the bottom layer define a cavity. The special-shaped layer is of a multi-layer laminated structure, and the multiple layers are independently selected from any one of a linear layer, a circular layer and a pentagram-shaped layer and are different from one another; wherein the cross section of fibers used by the straight-line-shaped layer is straight-line-shaped; the cross section of the fiber used by the circular layer is circular; and the section of the fiber used by the pentagram-shaped layer is pentagram-shaped. When sound waves penetrate through the special-shaped layer, the sound waves can be reflected back and forth and spread among the linear layer, the circular layer and the pentagram-shaped layer of the special-shaped layer, and therefore sound energy can be further consumed, and the multilayer special-shaped section sound absorption material has good sound absorption performance.

This invention belongs to the field of acoustic-to-electric conversion technology, and discloses an aerogel acoustic-to-electric conversion device with both sound absorption and power generation functions, as well as its preparation method. The aerogel acoustic-to-electric conversion device of this invention includes a nanofiber aerogel layer, electrode layers respectively disposed on opposite sides of the nanofiber aerogel layer, and a clamp for fixing the nanofiber aerogel layer and the electrode layers. The nanofiber aerogel layer comprises a three-dimensional porous structure composed of piezoelectric nanofibers. The electrode layers include a substrate and a conductive layer disposed on one side of the substrate. The electrode layers have a through-hole array, and the conductive layer is in contact with the nanofiber aerogel layer. The aerogel acoustic-to-electric conversion device of this invention can achieve the conversion of sound wave-induced mechanical energy into electrical energy while maintaining the sound absorption performance of the aerogel, and is suitable for scenarios such as noise absorption, sound energy harvesting, and self-powered sensing.

This invention discloses a coatable, moldable dual-functional coating material for heat protection and stealth, and its preparation method. The coating material is formed from a SiC-based composite ceramic aerogel slurry, a perovskite / MAX phase composite ceramic absorber, and a high-temperature resistant binder. The composite ceramic aerogel slurry is composed of SiC micro / nano-scale aerogel powder, SiC nanowires, and a high-temperature resistant binder; the perovskite ceramic absorber is lanthanum strontium manganese oxide (La). 1‑x Sr x MnO3), lanthanum strontium iron oxide (La) 1‑ x Sr x FeO3), lanthanum strontium cobalt oxide (La) 1‑x Sr x The MAX phase ceramic absorber is Ti3SiC2, and it contains substances such as CoO3. The technology of this invention enables the rapid application of coating materials to the surface of equipment via brushing, enhancing high-temperature radar absorption stealth and thermal protection capabilities, and facilitating the preparation and efficient repair of high-temperature stealth coatings.

This invention belongs to the field of electromagnetic shielding, and relates to an electromagnetic shielding material with a macroscopic conical hole structure, its preparation method, and its application. The preparation method includes: S1. Adding graphene nanosheets and polylactic acid particles to dichloromethane to obtain a graphene composite dispersion; S2. Drying the graphene composite dispersion at room temperature in a fume hood to obtain a graphene / polylactic acid composite material; S3. Chopping the obtained graphene / polylactic acid composite material and feeding it into a benchtop extruder, extruding composite filaments for 3D printing via melt spinning; S4. Creating a 3D printing model on a computer, feeding the composite filaments into a 3D printer, and processing the material with a macroscopic conical hole array structure using computer-controlled 3D printing. This electromagnetic shielding material exhibits excellent electromagnetic shielding performance, has a simple processing technology, low equipment parameter requirements, and is suitable for industrial production.

The utility model relates to the technical field of wall surface cloth, in particular to curved surface acoustic wall surface sticking cloth. The patch comprises a patch body, two convex grooves are formed in the surface of the patch body, strip-shaped plates are connected to the surfaces of the convex grooves in a sliding mode, connecting blocks are fixedly connected to the surfaces of the strip-shaped plates, flannelette is fixedly connected to the surfaces of the two connecting blocks, and the flannelette is attached to the surface of the patch body. The surface of the flannelette is fixedly connected with a plurality of flannelette points, the height sizes of the flannelette points are different, the surface of the patch body is provided with a plurality of sound absorption grooves, and a plurality of refraction protrusions are arranged in the sound absorption grooves. The problems that when sound waves meet a flat patch body, the sound waves on the surface of the patch body are intensively reflected, so that indoor sound interferes with each other, echo is obvious, voice definition is reduced, noise pollution is aggravated, normal communication, learning and rest of people are seriously affected, and even hearing fatigue is possibly caused are solved.

The present invention provides a nanostructure for enhancing the nonlinear luminescence performance of perovskite and a preparation method thereof, comprising a luminescent layer and a substrate arranged in sequence from top to bottom, wherein the luminescent layer of the upper layer is composed of a plurality of independent perovskite nanostructure arrays, and each perovskite nanostructure is a mixture of a transparent high molecular polymer and perovskite. With only a few simple steps, a large-scale nano pattern can be obtained, which has the advantages of low price, easy processing, large-area preparation, etc. In addition, the nanostructure enables the perovskite to obtain an enhanced electromagnetic field, improves the nonlinear optical performance of the perovskite, and lays an important foundation for optoelectronic applications based on micro-nanostructure perovskites.

This invention provides a film that combines thermal conductivity, thermal insulation, and electromagnetic shielding. It includes a high thermal conductivity film, a phase change film, and a thermally insulating electromagnetic shielding film. The high thermal conductivity film and the thermally insulating electromagnetic shielding film are respectively disposed on both sides of the phase change film. The thickness of the high thermal conductivity film is 0.01–0.5 mm; the thickness of the phase change film is 0.1–1 mm; and the thickness of the thermally insulating electromagnetic shielding film is 0.05–1.5 mm. This invention, combining thermal conductivity, thermal insulation, and electromagnetic shielding, can effectively solve the problem of poor heat dissipation in electronic devices such as mobile phones under high load, while reducing the impact of electromagnetic radiation on users. The product is lighter, thinner, and more flexible; the entire film product can be completely folded without material breakage.

This utility model relates to the technical field of rotating machinery life testing platforms, and in particular to a base isolation and noise reduction structure for a rotating machinery life testing platform. The structure includes a base plate, a top plate, and a base. Isolation components are provided on the outer sides of the base plate and top plate, and noise reduction components are provided on the inner sides of the isolation components. An installation component is provided between the isolation components and the base plate and top plate. The noise reduction components include multiple sets of noise reduction strips, all of which are hollow inside and arranged in a regular, continuous, undulating wave shape. The multiple sets of noise reduction strips are arranged perpendicularly and interlaced. The inner cavity of the noise reduction strips is filled with sound-absorbing cotton. The upper and lower ends of the base are fixedly connected to the top plate and base plate, respectively. This utility model can reflect and scatter sound waves multiple times to extend the propagation path of the sound waves, causing them to consume more sound energy, thereby providing excellent noise reduction effects.

This application discloses a method for preparing radiation-shielding mortar based on lead-zinc tailings. By crushing and density sorting lead-zinc tailings containing barite, the synergistic effect of high-density and low-density components is rationally utilized. On this basis, functional components such as rare earth tungsten composite oxide powder, boron-containing zirconium complex modifier, calcium aluminate, quasi-crystalline rare earth silicate powder, and graphene oxide dispersion are introduced to construct a radiation-shielding mortar system with high density, multi-energy-level radiation absorption capacity, and excellent mechanical properties. This effectively improves the mortar's attenuation capacity for various types of radiation such as gamma rays and neutron rays. At the same time, the quasi-crystalline structure and the micro-enhancing effect of graphene oxide significantly reduce the internal porosity of the material and improve the interfacial bonding state. Thus, while realizing the high-value utilization of lead-zinc tailings resources, it overcomes the problems of insufficient radiation shielding efficiency, difficulty in balancing mechanical properties and durability, and low level of industrial solid waste utilization in existing radiation-shielding mortars.

The range hood comprises a shell, a fan and a control assembly which are arranged in the shell, and an exhaust fume collecting hood arranged at the bottom of the shell, the fan is vertically arranged in the shell, a fume inlet of the fan is opposite to the inner wall of the rear side of the shell, a fume guide cavity is formed between the fan and the inner wall of the rear side of the shell, and the noise reduction guide plate is obliquely arranged on the upper portion of the fume guide cavity. The upper end of the noise reduction flow guide plate is located above the smoke inlet and fixedly connected with the top wall of the machine shell, and the lower end of the noise reduction flow guide plate is opposite to the smoke inlet and connected with the rear side wall of the machine shell in a clamped mode. Compared with the prior art, the range hood provided with the noise reduction flow guide plate has the advantages that the upper end of the noise reduction flow guide plate is connected with the top wall through the two screws, so that the noise reduction flow guide plate can bear direct impact of airflow without deformation or vibration, and secondary noise is avoided; the lower end of the noise reduction flow guide plate is clamped with the rear side wall of the machine shell, the placement angle of the noise reduction flow guide plate can be limited through clamping matching, and the installation precision of the noise reduction flow guide plate is guaranteed.

The invention relates to a preparation method of a composite material box body with an inner boss, in particular to a preparation method of a SiC / SiBCN ceramic matrix composite material box body with an inner boss. In order to overcome the defects that in the prior art, the preparation process of a composite box body with an inner boss is complex, holes are formed in areas with different thicknesses, and hole filling fiber bundles are prone to deformation and dislocation after being pressed, so that the structure is unstable. The preparation method of the SiC / SiBCN ceramic matrix composite box with the inner boss sequentially comprises the steps of SiC fiber prefabricated body preparation, high-temperature treatment, boron nitride interface layer preparation, Si3N4 matrix deposition, SiBCN matrix preparation, Si3N4 matrix deposition and the like, the SiC fiber prefabricated body is prepared from a U-shaped prefabricated body, a concentric-square-shaped prefabricated body and an exterior prefabricated body, and the stability of the mounting boss is improved.

The invention discloses a soil ecological environment gas detection system, and relates to the field of gas detection. The system comprises a gas collecting unit, a gas collecting cavity, an optical signal transmitting unit, an optical signal receiving unit, a gas pressure sensor and a control processing unit, the gas collection unit is used for collecting soil gas in target soil, and the soil gas comprises greenhouse effect gas; the gas collection cavity is used for accommodating soil gas; the optical signal transmitting unit is positioned at one end of the gas collecting cavity; the optical signal receiving unit is positioned at the other end of the gas collection cavity and is used for generating a photoelectric sensing signal; the air pressure sensor is arranged in the air collection cavity; and the control processing unit is used for determining the greenhouse effect gas concentration of the soil gas according to the photoelectric sensing signal, and performing compensation treatment according to the cavity gas pressure to obtain the greenhouse effect gas detection concentration. The soil ecological environment monitoring system has the real-time data processing capability, so that the detection result can be fed back quickly, and timely and accurate information is provided for monitoring and management of the soil ecological environment.

The application relates to the photovoltaic technical field and provides a back contact solar cell, a preparation method thereof, a laminated cell and a photovoltaic module. The back contact solar cell comprises a substrate including oppositely arranged first and second surfaces, the second surface includes alternately arranged first and second regions, the first region includes a first rough surface and a first plane, and in the thickness direction of the substrate, the first plane is convex to the side away from the first surface relative to the first rough surface, and the second region includes a second rough surface; a first doped layer is arranged on the first region; a first electrode is electrically connected with the first doped layer, and in the thickness direction of the substrate, the first electrode at least partially overlaps with the first plane; a second doped layer is arranged on the second region, and the doping type of the second doped layer is different from that of the first doped layer; and a second electrode is electrically connected with the second doped layer.

The present invention provides a headphone shell noise testing device, which relates to the field of acoustic testing technology, including an operating table, a product fixture, a plurality of motor drive modules and an electric control element module; the operating table includes a main sealed box, a product fixing area arranged above the main sealed box, an electric control element area arranged in the main sealed box, and a plurality of sub-sealed boxes arranged in the product fixing area; the product fixture is arranged in the product fixing area; the output shaft of the motor drive module passes through the sub-sealed box and is connected to the product fixture; the shells of the main sealed box and the sub-sealed box each include a metal layer, a composite plate layer, a damping material layer and a sound-absorbing material layer arranged in sequence from the outside to the inside, and the metal layer, the composite plate layer and the damping material layer are provided with array-distributed and staggered conical silencing cavities. The present invention significantly improves the low-frequency sound insulation effect and ensures the accuracy of the test data through the design of a multi-layer composite sound insulation structure and a conical silencing cavity.

This invention provides an exhaust structure, a pump assembly, a compressor, and an air conditioner. The exhaust structure includes a pump body flange with an exhaust groove formed thereon. Multiple circumferentially arranged exhaust holes are formed on the bottom wall of the exhaust groove. An annular exhaust valve plate and a valve cover are provided on the exhaust groove. The central hole of the annular exhaust valve plate is a first flow hole, and the valve cover has a second flow hole. The annular exhaust valve plate is located within the accommodating space formed between the valve cover and the exhaust groove. The annular exhaust valve plate has a check valve state that blocks all exhaust holes and an exhaust state that connects all exhaust holes, the first flow hole, and the second flow hole. Under the pressure difference between its two end faces, the annular exhaust valve plate switches between the check valve state and the exhaust state by lifting and lowering as a whole. This invention helps reduce noise, improves the stability and durability of the exhaust structure, and avoids tilting or damage to the aforementioned annular exhaust valve plate due to uneven pressure distribution.

The embodiment of the invention provides a preparation method of an electromagnetic wave absorbent and the electromagnetic wave absorbent. The polymethyl methacrylate dispersion liquid and the MXene colloidal solution are mixed and then stirred to obtain a first precipitate, and the first precipitate is dried to obtain first mixed powder; dispersing the first mixed powder in a first solvent to obtain a first dispersion liquid; cobalt salt is dispersed in a second solvent, and second dispersion liquid is obtained; dispersing the MOFs organic ligand in a third solvent to obtain a third dispersion liquid; mixing the first dispersion liquid and the second dispersion liquid, then mixing and stirring with the third dispersion liquid to obtain a second precipitate, and drying the second precipitate to obtain the composite material. And carbonizing the composite material to obtain the electromagnetic wave absorbent with the hollow heterostructure. According to the prepared electromagnetic wave absorbent, impedance mismatch is reduced, the loss form of the electromagnetic wave absorbent is enriched, and the wave absorbing performance of the electromagnetic wave absorbent is enhanced.

The invention discloses a double-layer composite deadening felt device which comprises a reflecting film layer, a nanometer heat insulation cotton layer, a shock absorption and sound absorption layer, a fiber composite layer, a flame-retardant deadening felt layer and a protective bonding layer which are sequentially arranged in a stacked mode. One side of the reflecting film layer is connected with the nanometer heat insulation cotton layer, and one side of the nanometer heat insulation cotton layer is connected with the shock absorption and sound absorption layer; according to the double-layer composite deadening felt device, the sound insulation performance, the sound absorption performance and the shock absorption performance can be effectively improved, by arranging the reflecting film layer and the nanometer heat insulation cotton layer, noise can be partially reflected, heat insulation can be achieved, and therefore noise transmission is reduced; due to the design of damping holes and bubbles in the damping and sound absorbing layer, high-frequency and low-frequency noise can be absorbed, effective damping is achieved, the transmission path of sound waves is effectively prolonged through a net-shaped sound absorbing channel in the fiber composite layer, the sound insulation effect of the device is further enhanced, and the overall structure is simple.

The invention relates to the technical field of texturing additives for monocrystalline silicon wafers, and discloses a texturing additive for a pyramid textured monocrystalline silicon wafer and a preparation method of the texturing additive. Comprising the following raw materials in parts by mass: 1-1.5 parts of organic sulfonate, 1-2 parts of a polyamine high-molecular compound, 1-2 parts of a high-molecular polymer, 0.5-1 part of a surfactant, 0.2-0.5 part of a composite additive and 90-110 parts of deionized water. The composite additive contains a large number of carboxyl groups, hydroxyl groups and amino groups, the adsorption performance of the texturing additive on the surface of the monocrystalline silicon wafer can be enhanced, then a uniform pyramid structure is formed, the reflectivity is reduced, and the contained modified nano titanium dioxide can form a nano composite film on the surface of the monocrystalline silicon wafer, so that the texturing effect is improved. And the surface roughness and the scattering effect are further improved.

The invention relates to the field of semiconductor lasers, in particular to a surface emitting laser with a convertible cavity type. Comprising a resonant cavity conversion control electrode, a substrate, a dielectric film waveguide layer, a second resonant cavity active layer, an N-type electrode, a tunnel junction, a resonant cavity conversion control layer, an N-type DBR layer, a first resonant cavity active layer, an oxide layer, a P-type DBR layer and a P-type electrode which are sequentially stacked from bottom to top. The N-type DBR layer, the first resonant cavity active layer and the P-type DBR layer form a first resonant cavity; the dielectric film waveguide layer, the second resonant cavity active layer and the P-type DBR layer form a second resonant cavity; the resonant cavity conversion control layer is made of electro-optical materials. Switching of laser between the two resonant cavities can be achieved, the oscillation path of the laser in the resonant cavities is changed, meanwhile, the polarization characteristic of materials can be adjusted, and the polarization state of the laser is changed.

The invention discloses a multifunctional composite ultramicro cotton needled felt and a preparation method thereof.The multifunctional composite ultramicro cotton needled felt comprises a needled felt body and base cloth, the needled felt body is composed of the base cloth, a filter layer, a heat insulation layer and a sound absorption layer, and the filter layer, the heat insulation layer and the sound absorption layer are sequentially distributed on the outer side of the base cloth from inside to outside; the filter layer is directly connected with and covers the outer side of the base cloth, the heat insulation layer is connected with and covers the outer side of the filter layer, and the sound absorption layer is connected with and covers the outer side of the heat insulation layer. Through the arrangement of the heat insulation layer and the combined use of the ceramic fibers and the aerogel material, the heat insulation layer can achieve an efficient heat insulation effect and remarkably reduce the heat transfer rate, and the ceramic fibers and the aerogel material are environment-friendly materials, do not contain harmful substances and do not cause harm to the environment and human health; and the materials can be recycled, so that the resource consumption and the waste generation are reduced, and the environmental protection property and the sustainability of the material are further improved.

The present invention belongs to the technical field of material slitting, and in particular to a slitting machine for producing bamboo composite materials, comprising a board conveying platform, a slitting frame, a hollow slitting sheet, a perforated bracket, a streamlined push-pull assembly, a perforated assembly and a winding assembly, wherein the slitting frame is fixedly connected to the top of the board conveying platform, the hollow slitting sheet is movably connected to the inner side of the slitting frame, the streamlined push-pull assembly is hinged to the outer side of the hollow slitting sheet, the bottom of the perforated bracket is fixedly connected to the surface of the board conveying platform, the perforated assembly is slidably connected to the inner side of the perforated bracket, and the winding assembly is threadedly connected to the outer side of the board conveying platform; when the pushing cylinder is started, a plurality of groups of hollow slitting sheets complete left and right swinging actions in the middle of an anti-dropping shaft sleeve, and displacement compensation is completed by using a guide rod in conjunction with the telescopic function of a hollow sleeve rod, so that the porous hollow slitting sheets can jointly cut the bamboo composite board into a streamlined concave-convex structure with the same thickness on a uniform path, and improve the sound insulation effect of the bamboo composite board.

The invention discloses a solar cell adhesive film and a preparation method thereof, and relates to the technical field of adhesive film materials, the solar cell adhesive film comprises an adhesive film body and at least one photonic crystal structure layer located in the adhesive film body and / or on the surface of the adhesive film body; materials of the photonic crystal structure layer comprise a first material and a second material, the absolute value of the refractive index difference value of the first material and the second material is larger than or equal to 0.1, and the first material comprises at least one of an up-conversion material, a down-conversion material and a perovskite material. When the solar cell adhesive film provided by the invention is used as a packaging adhesive film of a solar cell, the light field distribution after sunlight incidence can be changed, the propagation path of sunlight in the solar cell is increased, and the effect of enhancing the photoelectric conversion efficiency of the solar cell is realized by utilizing light diffraction. The photonic crystal structure layer comprises at least one of an up-conversion material, a down-conversion material and a perovskite material, so that the photonic crystal structure layer can convert light in a wave band with relatively low absorption and utilization efficiency of the solar cell into light in a wave band with relatively high absorption and utilization efficiency; and the efficient absorption and utilization of sunlight in a wider wave band range by the solar cell are further enhanced. The two aspects are combined to improve the photoelectric conversion efficiency of the solar cell.

The utility model provides an assembly type building prefabricated wallboard with an anti-seismic energy dissipation structure, and relates to the technical field of building prefabricated wallboards, the assembly type building prefabricated wallboard comprises a front wallboard main body, the rear end face of the front wallboard main body and the front end face of a rear wallboard main body are fixedly installed and connected through an adhesive, and at the moment, a rear containing groove and a front containing groove jointly form a sound absorption energy dissipation cavity; sound waves enter the sound absorption cavities with the interior being of a spherical structure, the incident sound waves are subjected to the total reflection effect through the inner circumferential arc faces of the spherical cavities, and sound energy is converted into heat energy to be consumed through multiple times of reflection attenuation of the sound waves in the cavities in combination with the friction of the wall faces of the cavities and the viscous effect of air media; a continuous acoustic conduction network is formed, after sound waves are reflected for multiple times in a single spherical cavity, part of energy enters the adjacent cavities through the sound conduction reflection holes, the cross-cavity linkage reflection energy consumption process is triggered, and the problem that the sound wave treatment capacity of a traditional prefabricated wallboard is limited, and the comprehensive requirement of a building cannot be met is solved.

This utility model provides a hollow, one-time injection-molded composite fencing, relating to the field of fencing technology. It includes a fencing body and two sound-absorbing components, both fixedly installed on the exterior of the fencing body, for quickly absorbing noise generated during construction. In this utility model, when noise contacts the surface sound-absorbing panel, some sound waves are directly absorbed and reflected, achieving initial attenuation. The remaining sound waves enter the cavity through the sound inlet holes and undergo multiple reflections under the action of a specially designed corrugated plate, significantly extending the propagation path and converting most of the sound energy into heat energy. Finally, the residual sound waves are completely absorbed by the sound-absorbing cotton and the inner wall sound-absorbing panel, achieving noise reduction across the entire frequency band. The structure adopts a multi-layer composite noise reduction design, achieving efficient sound energy absorption through a stepped noise reduction mechanism. This not only effectively reduces noise pollution and harms residents' health but also significantly improves the traffic environment and reduces the risk of accidents caused by noise interference for drivers.