157results 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 discloses a germanium-silicon photoelectric detector, which relates to the field of photoelectric detectors and comprises a strip waveguide, a doped first silicon waveguide region, a doped second silicon waveguide region, a germanium layer, a doped germanium layer, a germanium upper electrode and a silicon upper electrode, the electrodes on the silicon surround all the side faces of the germanium layer, gaps at the vertex angles are reserved for transmission of optical signals, the full-surrounding electrodes reduce parasitic parameters of the photoelectric detector, and the bandwidth of the detector is improved. And the silicon strip waveguide is connected with the vertex angle of the second waveguide region corresponding to the silicon-on-electrode gap, and guides an optical signal to be input from the vertex angle of the second waveguide region and propagate along the diagonal line of the germanium layer, so that the propagation path of the optical signal is increased, the responsivity is improved, and the problem that the bandwidth and the responsivity are mutually restricted in the prior art is solved.

The invention discloses electromagnetic shielding aerogel with a double-layer structure and a preparation method of the electromagnetic shielding aerogel, the electromagnetic shielding aerogel is composed of cellulose nanofibers, hollow cobalt nickel carbon nanocages and few-layer MXene, and the electromagnetic shielding aerogel is of the double-layer structure. The electromagnetic shielding aerogel not only has excellent kilomegahertz shielding efficiency with low reflection characteristic, but also has great application potential in the fields of lightweight multifunctional electromagnetic shielding composite materials, special electromagnetic protection facilities, electromagnetic stealth materials, severe environment resistant electronic equipment and the like.

The vibration isolation structure comprises a vibration isolation body and vibration isolation layers arranged on the two sides of the vibration isolation body, each vibration isolation layer is of a porous structure, the vibration isolation layers are arranged between the vibration isolation body and surrounding rock, and the thickness of each vibration isolation layer ranges from 5 cm to 10 cm. According to the design, when fluctuation enters the porous structure, pores in the vibration isolation layer can generate multiple scattering and reflection on incident waves, the scattering and reflection processes prolong the propagation path of the fluctuation, increase the interaction time between the fluctuation and the interior of the material, guide the fluctuation energy to be dissipated in the vibration isolation structure, and further reduce the impact on the surrounding environment; by absorbing and dispersing fluctuation energy, the vibration isolation structure remarkably reduces transmission of vibration waves to surrounding buildings, and therefore potential damage to the buildings is reduced.

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 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 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 provides an MXene-based electromagnetic shielding material for anchoring 0 / 2-dimensional magnetic metal and preparation and application thereof.The electromagnetic shielding material comprises an MXene material, nearly-0-dimensional magnetic alloy microspheres and two-dimensional flaky magnetic metal, the MXene material is of a lamellar structure, the magnetic alloy microspheres and the flaky magnetic metal are embedded between lamellas of the MXene material, and the two-dimensional flaky magnetic metal is embedded between the lamellas of the MXene material. The mass of the magnetic alloy microspheres accounts for 8.3%-33.3% of the total mass of the electromagnetic shielding material, and the mass of the flaky magnetic metal accounts for 8.3%-33.3% of the total mass of the electromagnetic shielding material. The preparation method of the electromagnetic shielding material adopts a direct compounding mode of an anionic surfactant and an ultrasonic process. The preparation method is simple in process, the component proportion is easy to control, and the prepared electromagnetic shielding material is rich in electromagnetic loss mechanism, large in effective shielding bandwidth and remarkable in electromagnetic shielding effectiveness and has wide application prospects in electromagnetic interference prevention of MEMS sensor packaging, automobile electronic products, stealth fighter planes and wearable electronic equipment.

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 utility model discloses a silencer which comprises a body, the body is provided with a cavity, the two ends of the cavity are provided with a first communicating nozzle and a second communicating nozzle which are communicated with each other, and the first communicating nozzle and the second communicating nozzle are arranged in a staggered mode. A first inclined partition plate and a second inclined partition plate are arranged in the cavity, the first partition plate is provided with a first communicating groove, the second partition plate is provided with a second communicating groove, and the first communicating groove and the second communicating groove are vertically staggered; the first partition plate and the second partition plate divide the cavity into a first cavity, a second cavity and a third cavity, the first cavity is communicated with the first communication nozzle, the second cavity is located between the first cavity and the third cavity and communicated with the first cavity and the third cavity, and the third cavity is communicated with the second communication nozzle. The propagation path of sound waves in the silencer body is prolonged, the reflection frequency of the sound waves is increased, and finally a better silencing effect is achieved.

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.

The invention discloses an electromagnetic shielding porous film and a preparation method thereof, and the method comprises the following steps: firstly, preparing a film from a two-dimensional nano material or a composite nano material of a one-dimensional nano material and the two-dimensional nano material, and then carrying out supercritical foaming on the film to prepare the electromagnetic shielding porous film. The film is prepared by taking a nano material as a raw material, the porous film is obtained through supercritical foaming, and the porous film not only can reduce the interface impedance mismatching between the material and air, so that electromagnetic waves are easy to sink into the composite film, but also provides a multiple reflection / scattering interface for the electromagnetic waves, so that the propagation path of the electromagnetic waves is greatly increased; the composite material can effectively attenuate electromagnetic waves, has excellent electromagnetic shielding effectiveness, and is simple in preparation method, pollution-free in process and suitable for the technical field of electromagnetic shielding.

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.

The invention relates to a rare earth complex ink with scattering particles doped with a pyrazoloboron Ce (III) complex, and preparation and application thereof, and belongs to the field of light-emitting display. The scattering particles are introduced into the rare earth complex ink, so that the scattering of light can be effectively increased, the propagation path of light can be prolonged, the opportunity of absorbing light by the rare earth complex can be increased, the luminous efficiency can be enhanced, exciting light can be uniformly distributed, brightness spots and dark areas in printed patterns can be reduced, and the consistency of visual effects can be ensured; the light rays scattered in multiple directions can broaden the light-emitting angle, so that the pattern can keep a good light-emitting effect at different observation angles. In addition, by changing the propagation path of the light, the scattering particles reduce the retention time of the light in the rare earth complex, the self-absorption effect is reduced, and the luminous efficiency is further improved.

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 invention discloses a radar-sound compatible absorption superstructure and a preparation method thereof, and belongs to the technical field of sound absorption and wave-absorbing materials, the superstructure is formed by a wave-absorbing material through fused deposition 3D printing, and has three-dimensional gradient components and a hierarchical pore structure, the hierarchical pore structure comprises a microscopic pore structure and a macroscopic pore structure, the macroscopic hole structure is a space folding inclined hole; microscopic holes and macroscopic holes are formed in the superstructure at the same time, resonance absorption peaks are formed at different frequencies through the composite effect of the micro / macroscopic holes, the problem that a traditional radar-sound wave compatible absorption material is too large in thickness / size is solved, it can be guaranteed that incident electromagnetic waves in different directions can make full contact with an absorber, all-directional multi-stage reflection is achieved, and the absorption efficiency is improved. Moreover, the folded multi-stage inclined holes can prolong the propagation path of sound waves and radar waves under the condition that the thickness of the structural member is not increased, multiple reflections are formed in the folded channel, and therefore rapid wave dissipation is caused in the channel.

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 invention discloses a photovoltaic panel synergistic coating based on a nano conductive polymer and a preparation method thereof, belongs to the technical field of photovoltaic component coating synergism, and is used for solving the technical problem that the anti-aging performance of a photovoltaic component synergistic layer and the photoelectric conversion efficiency of a photovoltaic component need to be further improved in the prior art. The preparation method comprises the following steps: adding sodium p-styrenesulfonate, a modified antioxidant and N-methyl pyrrolidone into a reaction kettle under the protection of nitrogen, stirring until the system is dissolved and clarified, and adding modified titanium dioxide into the reaction kettle; according to the invention, polycondensates of modified titanium dioxide, a modified antioxidant, modified polysiloxane and sodium p-styrenesulfonate are enhanced by isocyanate propyl triethoxy silane, so that not only are the conductivity and light absorption performance of the synergistic coating effectively improved, but also the aging resistance and adhesion performance of the synergistic coating are improved; and the photovoltaic panel can maintain high photoelectric conversion efficiency in the long-term use process.

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.