24results about How to "Extended propagation path" patented technology

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.

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 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 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.

The invention belongs to the technical field of acoustic metamaterials, and discloses an acoustic metamaterial silencing structure and a preparation method thereof. The structure comprises a microwell plate structure layer, a porous material structure layer and an acoustic metamaterial unit array structure layer, the microwell plate structure layer is provided with a first sound absorption channel group, and the microwell plate structure layer is closer to the sound source side than the porous material structure layer; the porous material structure layer is provided with a second sound absorption channel group; the acoustic metamaterial unit array structure layer is arranged between the microplate structure layer and the porous material structure layer and comprises a silencing unit group, the silencing unit group comprises a plurality of silencing units which are arranged in the circumferential direction, the silencing units define a silencing cavity, neck channels are arranged on the side walls, facing the silencing cavity, of the silencing units in a protruding mode, and the neck channels are communicated with the silencing cavity. The silencing cavity is communicated with the first sound absorption channel set and the second sound absorption channel set through the neck channel, the inner wall face of the neck channel is limited to form a sound absorption face so that sound wave energy entering and exiting the silencing cavity can be reduced, and the purposes of silencing and noise reduction are achieved while the weight is light.

The mute elevator shaft is arranged outside an elevator and comprises a plurality of hollow plate units arranged in a connected mode, each hollow plate unit comprises a concrete shell and a plurality of layer plate assemblies arranged in the concrete shell, the plurality of layer plate assemblies and the concrete shell are enclosed, and a plurality of cavities are formed in the hollow plate units. And the cavity is filled with a sound absorption part. According to the mute elevator shaft, the elevator shaft body is formed by splicing the multiple hollow plate units, the concrete shell is used for providing a stable structure foundation, the multiple cavities defined by the internal laminate assemblies and the shell are matched with the filled sound absorption parts, a sound insulation and absorption system is constructed, and starting from the overall structure, the sound wave propagation path is divided through the cavity structures, and the sound absorption effect is improved; and noise energy is directly adsorbed by means of the sound absorption part, primary efficient weakening of various noise in elevator running is achieved, convenience is improved through the modular splicing mode, and the structural stability and the mute requirement are both considered.

The application relates to the technical field of photovoltaic modules, in particular to a laminated cell, a preparation method thereof and a photovoltaic module. The laminated cell comprises a top cell unit, a bottom cell unit and a composite layer between the top cell unit and the bottom cell unit. The composite layer comprises a plurality of spaced rod bodies, the rod bodies extend along a first direction, and the rod bodies have a first doping element. The rod bodies at least have a first part and a second part which are stacked, and the doping concentration of the first part is different from that of the second part. The structure of the rod bodies which are spaced and extend along the first direction in the composite layer can form a vertical carrier transport channel in the composite layer, the diffusion path of the carriers is shortened, and thus the carrier transport rate is improved. Meanwhile, by adjusting the doping concentrations of the first part and the second part, the conduction band energy levels of the first part and the second part can be adjusted, so that the potential barrier of the carriers during transmission in the composite layer is reduced, and voltage loss is reduced.

The utility model relates to the field of damping rubber sheet, specifically disclose a damping rubber sheet for car, including damping rubber sheet main part, damping rubber sheet main part includes from top to bottom sequentially arranged corrosion -resistant protective layer, reinforcing layer, double damping layer, magnetic composite layer, first adhesive layer, double damping layer includes laminated arrangement and close reinforcing layer's upper damping layer, far away reinforcing layer's lower damping layer, the upper damping layer, lower damping layer all are provided with a plurality of sound absorption holes, the porosity of upper damping layer is greater than the porosity of lower damping layer. Double damping layer can carry out graded absorption and processing to the noise of different frequency, and the larger porosity of upper damping layer is favorable to absorb middle high frequency noise, and the smaller porosity of lower damping layer has better absorption effect to low frequency noise, thereby can effectively widen the noise reduction frequency band of this damping rubber sheet, significantly improve the overall noise reduction performance, can effectively reduce various noises in the car, create a quiet and comfortable in-car environment for the driver and passenger.

The utility model provides a sound-absorbing crystal wood board convenient to install, which comprises a plurality of composite sound-absorbing boards, the whole composite sound-absorbing boards are arranged in a rectangular shape, two ends of each surface of each composite sound-absorbing board are respectively provided with an installing groove, and a connecting mechanism is clamped in each installing groove. During use, after the edges of the two composite acoustic panels are aligned, the I-shaped connecting blocks can be embedded into the inverted-T-shaped mounting grooves, the limiting springs are compressed under the extrusion of the inner walls of the mounting grooves by utilizing the guide of the inclined planes of the right-angled trapezoidal clamping blocks, and when the connecting blocks are inserted into the clamping grooves, the clamping blocks reach the clamping grooves, the clamping blocks can be clamped into the clamping grooves; each surface of the composite acoustic panel is provided with a mounting groove and a connecting mechanism, multi-direction extension splicing is supported, the mounting flexibility is improved, during dismounting, the push block with the anti-skid groove is pushed to drive the clamping block to be separated from the clamping groove, the connecting block can be taken out, quick dismounting is realized, and the use convenience is remarkably improved.

The application relates to the technical field of hydrogen concentration optical visual detection, in particular to a hydrogen concentration detection device which comprises a detection table, an optical testing device body arranged on the detection table, a detection pipeline body in communication with one end of the optical testing device body, visual detection of a to-be-detected gas by the optical testing device body after the to-be-detected gas enters the detection pipeline body, a joint, a mixing assembly, a buffer assembly, a speed reduction assembly and a reflection assembly arranged in the detection pipeline body in sequence along a gas entering direction; the mixing assembly, the buffer assembly, the speed reduction assembly and the reflection assembly are arranged in the detection pipeline body in sequence, and the optical testing device body is combined with the optical regulation and control means of a beam splitter and a concave lens, the problem of uneven hydrogen distribution is solved through the mixing assembly, the gas flow rate is reduced and the contact time is prolonged through the buffer and speed reduction assembly, and finally the optical path is significantly prolonged through the optical assembly, and the detection signal is enhanced.

This invention relates to a gas water heater and its casing assembly. On one hand, the air inlet and the first air outlet are staggered. This elongates the propagation path of the composite noise after it passes through the chamber, unlike the straight-in-straight-out method of traditional technology. Instead, the noise is attenuated within the chamber due to refraction, reflection, and diffraction caused by the undulations of the pressure profile, significantly reducing the sound energy of the noise. Furthermore, the attenuated composite noise reaches the multiple air inlets and the strip-shaped opening. Because the corresponding parts of the chamber with the multiple air inlets form a perforated plate resonant silencer, the resonant frequency is close to the combustion frequency. Thus, the incident sound wave of the composite noise generates intense vibration and friction as it passes through the air inlets, forming an absorption peak and reducing the sound energy of the noise. In this way, the noise is attenuated during its propagation and diffusion within the chamber, and undergoes sound energy attenuation before propagating outwards, effectively reducing system noise. The overall operating noise can be reduced by approximately 3dB-5dB.

The invention relates to the technical field of ceramics, and particularly discloses a wear-resistant antique gold thread brocade glaze ceramic product and a preparation method thereof.According to the wear-resistant antique gold thread brocade glaze ceramic product, through the synergistic effect of multiple components in glaze, on the basis of maintaining the unique artistic texture of antique brocade glaze, the problem that a reinforcing phase in traditional brocade glaze is prone to falling off is solved, and the wear-resistant antique gold thread brocade glaze ceramic product is obtained. And the obtained product realizes effective unification of archaized art aesthetic appreciation and long service life, and is especially suitable for high-end furnishings and daily use occasions with higher requirements on surface durability.

The application provides a solar cell, a photovoltaic module and a photovoltaic system. The solar cell comprises: a solar cell body; a sub-wavelength nano light-trapping layer formed on at least part of the surface of the solar cell body, wherein the at least part of the surface comprises one or more of a front surface, a back surface and a side surface; the sub-wavelength nano light-trapping layer comprises a plurality of light-trapping structures; the width of the gap between adjacent light-trapping structures changes in the direction away from the substrate of the solar cell body; the sub-wavelength nano layer can be prepared on the front surface, the back surface and the side surface of the solar cell, so that the incident light is subjected to multiple reflections and refractions, the propagation path of the light is prolonged, the light absorption rate is improved, and the light utilization rate is improved.

This disclosure relates to a light-emitting component, a display screen, and an electronic device. The light-emitting component includes multiple pixel definition sections and multiple light-emitting devices. The multiple pixel definition sections are arranged in an array, and the light-emitting devices are disposed in a cavity formed by adjacent pixel definition sections. The light-emitting component also includes a reflective section disposed in the cavity, wherein at least a portion of the light emitted by the light-emitting devices is reflected by the reflective section and then emitted outside the cavity, thereby extending the propagation path of the light. By providing a reflective section, the light-emitting component of this disclosure extends the propagation path of at least a portion of the light emitted by the light-emitting devices, which is equivalent to extending the length of the optical microcavity in which the light-emitting devices are located, enhancing the microcavity effect, increasing the gain of the optical microcavity, which is beneficial to improving the display effect and reducing the power consumption of the light-emitting component.

The utility model discloses a wall lamp which comprises a base provided with a positioning plate extending in a plane and an annular vertical wall vertically extending along the periphery of the positioning plate, and a first clamping structure is arranged at the top end of the vertical wall; the shell assembly comprises an annular sleeving wall extending towards the base, and a second clamping structure complementary with the first clamping structure is arranged at the top end of the sleeving wall; the sleeving wall is assembled with the first clamping structure in the vertical direction in a clamping mode through the second clamping structure, so that the sleeving wall is fixed to the outer side of the vertical wall in a wrapping mode. Through the arrangement of the clamping structures matched with the top ends of the vertical walls and the top ends of the sleeving walls, when the shell assembly and the base are assembled, clamping assembly can be conveniently completed from top to bottom, the structure is simple, adults can complete clamping connection of the shell assembly and the base without the help of climbing tools, and use is convenient. The installation efficiency of the shell assembly and the base and the construction safety are improved.