16results about How to "Reduce penetration depth" patented technology

The embodiment of the invention discloses an ultrasonic harmonic image generation method and device, electronic equipment and a medium. A specific embodiment of the method comprises the following steps: controlling an ultrasonic transmitting probe to transmit a low-frequency ultra-harmonic signal; controlling an ultrasonic receiving probe to receive the echo signal set to be detected; carrying out compressed sampling processing on the echo signal set to be detected and then carrying out signal reconstruction to obtain a reconstructed echo signal set; carrying out delay superposition processing on the reconstructed echo signal set to obtain a superposed echo signal; performing signal filtering decomposition processing on the superposed echo signals to obtain a super-harmonic signal set; performing envelope detection on the super-harmonic signal set to obtain an echo amplitude information set; and generating a target area ultrasonic harmonic image set, and sending the target area ultrasonic harmonic image set to a target terminal for display. According to the embodiment, by transmitting the low-frequency signal and receiving the ultra-harmonic signal, the attenuation of the received signal can be reduced, the signal penetration depth can be improved, the purity of the received signal can be improved, and the quality and the resolution of the generated ultrasonic harmonic image can be improved.

The invention provides an X-ray photovoltaic radiation cell based on a gallium-containing semiconductor and a preparation method of the X-ray photovoltaic radiation cell. The gallium-containing semiconductor X-ray radiation photovoltaic cell comprises a gallium-containing semiconductor transduction unit and an X-ray radiation source 55Fe arranged on the semiconductor transduction unit, wherein the semiconductor transduction unit containing gallium comprises at least one of GaAs (gallium arsenide), GaInP (gallium indium phosphide), GaP (gallium phosphide) and Ga2O3 (gallium trioxide). According to the invention, the structure of a radiation photovoltaic cell is adopted, the output power density of an X-ray radioactive source 55Fe can be effectively improved, the penetration depth of the X-ray source 55Fe in a semiconductor can be effectively shortened by taking GaAs, GaInP, GaP and Ga2O3 as semiconductor materials, and meanwhile, the collection capability of current carriers is effectively improved by adjusting the total thickness of a semiconductor transduction unit and the doping concentration of each layer, so that the performance of the X-ray source 55Fe is improved. And finally, the preparation of the X-ray radiation photovoltaic cell with high output power and high energy conversion efficiency is realized.

The invention relates to the technical field of current transformers, in particular to a current transformer for suppressing electromagnetic interference by adopting a high-frequency magnetic ring method. A housing; the number of the ports is two, and the two ports are fixedly connected and penetrate through the shell. The coil is fixedly connected to the interior of the shell; the number of the main magnetic rings is two, and the two main magnetic rings are fixedly connected to the interior of the shell and distributed on the two sides of the coil respectively; the fixing frame is fixedly connected to the interior of the shell, the fixing frame is in sliding connection with a plurality of sliding frames, each sliding frame is fixedly connected with two auxiliary magnetic rings, and the auxiliary magnetic rings are attached to the adjacent main magnetic rings; the stabilizing assembly is arranged in the shell; and the driving assembly is arranged in the shell. By changing the attaching position of the auxiliary magnetic ring and the main magnetic ring, the side, close to an external electric appliance element, of the main magnetic ring is superposed with the auxiliary magnetic ring, the resistance to an external interference magnetic field is improved, and the current detection precision of the device is improved.

According to the sunscreen fabric and the preparation method thereof, a basic fabric is soaked in different agents to be treated, the sunscreen fabric is prepared, modified nylon serves as a base material of the sunscreen fabric, modified nylon molecules are of a branched structure, a molecular chain contains a hydroxyl benzophenone structure, keto groups and hydroxyl groups of the hydroxyl benzophenone structure can form internal hydrogen bonds, a chelate ring is formed, and therefore the sunscreen fabric is formed. After ultraviolet rays are absorbed, hydrogen bonds are broken, chelate rings are opened, energy of the ultraviolet rays is converted into heat energy to be released, the sunscreen fabric contains a framework structure of imidazole zinc, and the framework structure has a high specific surface area and a porous structure, so that the ultraviolet rays can be captured and scattered, the penetration depth is reduced, and the effect of shielding the ultraviolet rays is achieved; meanwhile, the surface of the fabric contains the organic silicon layer and the benzene ring and long-chain alkyl group hydrophobic layer, so that zinc imidazole can be prevented from falling off due to repeated washing, and the sunscreen service life of the fabric is further prolonged.

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

This invention relates to the field of refractory fiber materials, and more particularly to raw materials comprising, by weight: 30-60 parts magnesium aluminum spinel, 10-30 parts M70 sintered mullite, 5-30 parts silica micropowder, 1-20 parts starch ether, and 0.5-2.0 parts surface-modified reinforcing fiber and 5-20 parts ZrO2 micropowder; wherein the surface-modified reinforcing fiber is pre-oxidized polyacrylonitrile fiber, and its surface is bonded or coated with a layer of silicon-based polymer precursor, wherein the silicon-based polymer precursor is selected from polysiloxane or polycarbosilane. The high-temperature resistant ceramic fiber coating of this application has good thermal insulation performance, strong stability, and excellent resistance to chemical erosion and wind erosion.

The utility model relates to the field of agricultural mulching films, mainly aims to solve the problem that the existing PBAT agricultural mulching film is insufficient in ultraviolet shielding effect, and provides an anti-ultraviolet PBAT composite degradable agricultural mulching film which is characterized by comprising a front packaging layer 1 serving as an illuminated surface, an ultraviolet shielding layer 2 and a back packaging layer 3 serving as a soil contact surface which are sequentially stacked, the ultraviolet shielding layer 2 comprises a structural body formed by compounding PBAT and a nanoscale ultraviolet shielding material, the nanoscale ultraviolet shielding material is of a micro-nano composite structure formed by uniformly mixing a nano sheet layer and a micron sheet layer in the ultraviolet shielding layer 2, and the nanoscale ultraviolet shielding material is arranged in a PBAT matrix in an oriented mode to form a brick mud structure. The PBAT degradable composite mulching film can effectively ensure visible light transmission and excellent mechanical properties, can reduce aging and degradation of the mulching film caused by ultraviolet radiation, and can be expected to be used in the agricultural field, especially in the agricultural field especially needing anti-ultraviolet shielding.

The invention relates to the technical field of castable, in particular to high-performance tundish cover castable based on high-aluminum ceramic chip recycled aggregate and a preparation method of the high-performance tundish cover castable. The castable comprises high-aluminum ceramic chip recycled aggregate, modified hollow alumina microspheres, andalusite and other components, and through roasting stabilization treatment of the recycled aggregate and multi-layer coating modification of the microspheres, the problems of poor heat preservation property and concentrated thermal stress caused by high doping amount of the recycled aggregate are solved. The andalusite cooperates with the modified microbeads to optimize aggregate-andalusite-microbead three-phase interface combination by virtue of the low-expansion characteristic and the active surface, so that the thermal shock resistance and the structural compactness are enhanced. The product has excellent heat preservation and heat insulation performance, high strength and slag corrosion resistance, resource efficient utilization of waste high-aluminum ceramic chips is achieved, and the service life of the tundish cover is prolonged.

This invention discloses a layered concrete structure with anti-penetration and filtering properties and its preparation method. It solves the problem in existing technologies where only the composition of the concrete layers is changed without improving the overall filtering performance. This invention has the beneficial effects of improving filtering performance and preventing further crack development. The specific solution is as follows: A layered concrete structure with anti-penetration and filtering properties includes a fiber-reinforced concrete layer and an intermediate composite material layer. The intermediate composite material layer is placed between two fiber-reinforced concrete layers. The fiber-reinforced concrete layer and the intermediate composite material layer are periodically arranged to form a layered concrete structure to enhance the filtering performance and improve the anti-penetration performance. The fiber-reinforced concrete layer contains steel fiber reinforcement to enhance the anti-penetration performance of the layered concrete structure. The wave transmittance in the intermediate composite material layer is different from that in the fiber-reinforced concrete layer, and the intermediate composite material layer is bonded to the fiber-reinforced concrete layer.

The invention discloses a high-resistance precast block, a draped dam bullet shielding layer and a preparation method of the draped dam bullet shielding layer, and the high-resistance precast block is formed by arranging more than one layer of high-strength and high-hardness ceramic balls in the high-resistance precast block, pre-burying lifting bars and then pouring ultra-high performance concrete. The hanging type dam bullet shielding layer is formed by splicing prefabricated blocks of the same structure. Semicircular grooves are formed in the side faces of the precast blocks or round steel pipes are evenly welded to the bottom faces of the precast blocks to serve as reserved anchoring holes, and rivets penetrate through the holes to anchor the precast blocks to the dam. The anti-impact performance of the dam can be remarkably improved, meanwhile, the assembling complexity is reduced, and improvement of construction convenience and economical efficiency is promoted.

The invention provides an elastic layer material for preventing micro-leakage after dental caries repair as well as a preparation method and application of the elastic layer material, and belongs to the technical field of oral medical materials. The elastic layer material comprises the following raw materials: a main component, an auxiliary component, a diluent, a mixed filler and a photoinitiator, the main component is a polyurethane elastomer prepolymer; and the auxiliary component is a hyperbranched polyester acrylate prepolymer. The main component polyurethane elastomer prepolymer forms a framework of an elastic layer material to ensure that the elastic layer material has certain elasticity, and the terminal group of the introduced auxiliary component hyperbranched polyester acrylate prepolymer is efficiently crosslinked with polyurethane, so that the elastic layer has a stable three-dimensional network structure, and the penetration depth of dye can be remarkably reduced.

The invention discloses an anti-penetration ultra-high performance concrete based on alumina modified aggregate and a preparation method and application thereof, belonging to the technical field of building materials. It is prepared from the following raw materials in parts by mass: 360-520 parts of cement, 36-52 parts of silica fume, 36-52 parts of fly ash, 800-1000 parts of fine aggregate, 800-1000 parts of alumina modified aggregate with a particle size of 3-5 mm, 39-78 parts of steel fiber, 120-130 parts of water and 5-10 parts of high-efficiency water reducer; the alumina modified aggregate is a core-shell structure, the aggregate is the core, and the outer side of the aggregate is coated with a sintered alumina shell. The alumina modified aggregate is prepared from the following raw materials in parts by mass: 50-80 parts of alumina powder, 100 parts of aggregate and 2-5 parts of binder. The multiple energy absorption mechanisms of alumina modified aggregate can significantly improve its anti-penetration performance while maintaining the extremely high strength of UHPC.

The present invention provides a protective device and a preparation method and application thereof, which relate to the field of bulletproof technology. The protective device includes a negative Poisson's ratio structural plate, which is located inside an ultra-high performance concrete, and the cavity inside the negative Poisson's ratio structural plate and the periphery of the negative Poisson's ratio structural plate are filled with ultra-high performance concrete; the negative Poisson's ratio structural plate includes a double-arrow structural layer and a sinusoidal structural layer arranged in sequence in a direction perpendicular to the bullet-facing surface, the cross-section of the double-arrow structural layer is a double-arrow-shaped negative Poisson's ratio structure, and the cross-section of the sinusoidal structural layer is a sinusoidal negative Poisson's ratio structure; the sharp angle direction in the double-arrow structural layer is perpendicular to the bullet-facing surface, and the wave crest of the sinusoidal structural layer is connected to the end of the sharp angle structure. The negative Poisson's ratio structure can absorb and disperse impact energy through geometric deformation, and the sharp angle structural design can effectively deflect the trajectory of the bullet, and can improve the energy absorption capacity of the ultra-high performance concrete, thereby reducing its penetration depth.

The invention discloses a method for inhibiting rust of rusted steel bars in a concrete structure, and aims to solve the problems that in the prior art, a safe, environment-friendly and long-acting steel bar corrosion inhibitor convenient to construct is lacked, and a long-acting steel bar corrosion prevention method formed by compounding materials such as an efficient anti-corrosion coating is lacked. Through three innovations of organic silicon modification, a nano-composite technology and a self-crosslinking system, the core problems of poor weather resistance, high VOC (Volatile Organic Compounds), insufficient dispersion stability and the like of the traditional acrylic emulsion are solved, and the acrylic emulsion is particularly suitable for severe environments with high ultraviolet rays, high humidity and the like, so that long-period corrosion prevention is realized, and the service performance of concrete is improved.

The utility model relates to the field of agricultural mulching films, and provides an anti-ultraviolet polylactic acid composite degradable agricultural mulching film mainly aiming at the problem of insufficient ultraviolet shielding effect of the existing polylactic acid-based agricultural mulching film, which is characterized by comprising a front packaging layer 1, an ultraviolet shielding layer 2 and a back packaging layer 3 which are sequentially stacked, the ultraviolet shielding layer 2 comprises a structural body formed by compounding polylactic acid and a nanoscale ultraviolet shielding material, and the nanoscale ultraviolet shielding material is of a micro-nano composite structure formed by uniformly mixing a nano sheet layer and a micron sheet layer in the ultraviolet shielding layer 2 and is arranged in a polylactic acid matrix in an oriented manner to form a brick mud structure. The mulching film can effectively reduce aging and degradation of the mulching film caused by ultraviolet radiation, can be effectively used for protecting root systems of crops from being damaged by the ultraviolet radiation, and can be expected to be used in the agricultural field, especially in the agricultural field particularly needing anti-ultraviolet shielding.

The invention relates to a PRB active material with a core-shell structure and a preparation method thereof.According to the method, an inert material is adopted as a carrier, a layer of active material is loaded on the surface and in pore channels of the carrier, the active material is composed of nanoscale zero-valent iron, a natural mineral material and a porous material, and the inert carrier provides high mechanical strength for the active material; and the nano zero-valent iron, the natural mineral material and the porous material exist on the carrier in a coating state, so that the contact area is large, and the permeability is good. The PRB active material with the core-shell structure prepared by the invention is simple in preparation process and relatively low in cost, and has a relatively good industrial application prospect.