37results about How to "Efficient shielding" patented technology

The invention relates to a broadband online measurement sensor for DC extra-high voltage corona current, which comprises an isolation electrode unit, a signal processing unit and a system power supply unit, wherein the isolation electrode unit comprises an insulated isolation sleeve, a hollow tubular long arm low-voltage electrode and a hollow tubular short arm high-voltage electrode, wherein two ends of the insulated isolation sleeve are respectively in security isolation connection with the high-voltage electrode and the low-voltage electrode in a special way; the signal processing unit consists of a sampling resistor module, a signal acquisition module, a signal conversion module and a signal transmission module; the system power supply unit comprises a storage battery pack and a charging module; and the signal processing unit and the system power supply unit are arranged in the isolation electrode unit, so that the high-accuracy integral measurement sensor can be formed. The broadband online measurement sensor solves the problems of shielding disturbance of a strong electric field between an acquired signal and an acquisition channel as well as surrounding stray capacitance, and realizes the broadband domain online measurement and the multi-point network online measurement of the DC extra-high voltage corona current.

The invention discloses an electromagnetic shielding machine case which is composed of a machine case housing (1), side panels (9), waveguide windows, an aviation plug (8) and a power filter (12). Two side panels (9) are arranged on choke grooves (13) on two lateral sides of the machine case housing (1) respectively, the aviation plug (8) and the power filter (12) are arranged in the machine case housing (1), and a front side panel (6) and a rear side panel (11) are respectively provided with a waveguide window to achieve a purpose of efficient shielding. The electromagnetic shielding machine case is clear in structure and good in practicality, achieves the purposes of being convenient to move, high in shielding efficiency, safety and reliability, good in environment adaptation and wide in application range, solves the problems of computer damage caused by electronic pulse and electromagnetic information leaking and is suitable for military and confidential situations.

The invention discloses an inflaming-retarding transparent plasticized PVC (Polyvinyl Chloride) functional thin film and a preparation method. The inflaming-retarding transparent plasticized PVC functional thin film has the characteristics of selectively transmitting and absorbing a solar spectrum and multiple functions of efficiently shielding ultraviolet rays, infrared rays, energetic visible light-blue light and the like. The inflaming-retarding transparent plasticized PVC functional thin film has an average shielding rate, which is up to 99 percent or above, in a 200nm to 400nm of ultraviolet waveband and an average inhibition rate, which is up to 99 percent or above, for 400nm to 500nm of the energetic visible light (blue light), and meanwhile, has a limit oxygen index which is more than 30 percent. The inflaming-retarding transparent plasticized PVC functional thin film provided by the invention is prepared from the following raw materials by mass: 100 parts of PVC resin, 60 to 70 parts of compound plasticizer, 2 parts of compound heat stabilizer, 0.1 to 1 part of compound light stabilizer, 0.1 to 0.5 part of functional pigment and 0.5 to 1 part of surface graft-modified metallic oxide.

The invention belongs to the special building material preparation field and the industrial solid waste comprehensive utilization field, and concretely relates to a preparation technology for a novel multi-element shield radiation protection cement and a product. The technology comprises steps: a radiation protection cement clinker, industrial solid waste, mixed materials and gypsum are subjected compounding mixing; the mixed materials are dispersed and then are subjected to on-line drying; the dried mixture is subjected to pre-grinding processing; the pre-grinding power is subjected to primary power section; sorted micro-powder is ground again, and micro-powder with a specific surface area of more than 430m<2>/kg is obtained; the micro-powder is subjected to secondary powder selection, and novel multi-element shield radiation protection cement with a specific surface area of more than 450m<2>/kg is obtained. The specific surface area of the cement powder is more than 450m<2>/kg, the content of particles with a particle size of 3-32 micrometers in the powder is more than 85%, the micro-particle content is high, the powder abundance weighted average is stable, heat of hydration is low, the early strength is high, the endurance is strong, and the novel multi-element shield radiation protection cement has characteristics of high-efficiency shielding, comprehensive protection, stable structure, low production energy consumption and the like.

The invention relates to a preparation method of a transparent rare earth composite oxide ultraviolet screener. The method is characterized in that the method comprises the following steps: processing raw materials comprising a rare earth salt solution and salts of tin and zinc to prepare a mixed solution having a rare earth ion concentration of 0.05-2mol/L and having a rare earth salt mass fraction of 40-80%, adding a dispersant for dissolving, adding a precipitating agent in a dropwise manner, reacting under stirring at 50-90DEG C until the pH value reaches 7-8, carrying out filtration washing, drying at 70-110DEG C for 6-24h for converting to precursor powder, heating the precursor powder to 900DEG C in a 300DEG C temperature gradient manner, and carrying out heat insulation for 30-180min to obtain the transparent rare earth composite oxide ultraviolet screener having an average particle size of below 500nm. The ultraviolet screener has the advantages of transparency, cheapness, high quality, easy industrialized production, strong shielding of ultraviolet ray in a wavelength range of 100-400nm, permeation of visible light in a wavelength range of 400-780nm, high heat stability, high chemical stability, non-toxicity, odorlessness and solvent resistance.

The invention discloses a microwave assisted ozone rapid catalytic decomposition device and a decomposition method thereof. The device sequentially comprises a gas inlet, a wind valve, a microwave ozone catalytic decomposer, a fan and a gas outlet, wherein the microwave ozone catalytic decomposer is composed of a modification microwave shielding screen at a gas inlet end, a modification microwaveshielding screen at a gas outlet end, and a microwave cavity, and the microwave cavity comprises a microwave generator and an ozone catalytic decomposition material filled in the microwave cavity, wherein every modification microwave shielding screen is a metal honeycomb screen coated with the ozone catalytic decomposition material. The device efficiently purifies high-humidity and high-air speedozone waste gas under the coaction of microwave radiation, high-temperature thermal decomposition and catalytic decomposition, and the microwaves also can realize the in situ regeneration of the ozonedecomposition material and the continuous decomposition of the ozone waste gas. The device and the method allow the ozone waste gas having different humidity ranges to be purified in different modes,are simple and efficient to operate, and can be widely applied to the field of industrial waste gas.

The invention discloses a blue ray and ultraviolet absorption adhesive tape and glue and preparation method thereof. The adhesive tape comprises a base material A, a blue ray and ultraviolet absorption adhesive layer, a base material B, a pressure-sensitive adhesive layer and a release film sequentially from top to bottom. The blue ray and ultraviolet absorption adhesive layer is formed by a blueray absorbent, an ultraviolet absorbent, acrylate resin and tackifying resin. The preparation method includes: coating two sides of the base material B with the blue ray and ultraviolet absorption adhesive layer and the pressure-sensitive adhesive layer respectively, drying through a drying tunnel, adhering the base material A on the blue ray and ultraviolet absorption adhesive layer of the base material B in a take-up stage, and laminating the release film on the pressure-sensitive adhesive layer. By the blue ray and ultraviolet absorption adhesive tape, blue ray and ultraviolet protection can be quickly provided for photosensitive materials in a processing process of optical and electronic devices, damages of the materials in a conventional workshop illumination environment are avoided,and defects caused by illumination are reduced.

The invention discloses thin-layer graphene aqueous slurry and a preparation method and application thereof. The thin-layer graphene aqueous slurry comprises the following components in percentage bymass: 1-10% of thin-layer graphene, 1-20% of filler, 0.5-5% of functional auxiliary agent and the balance water. According to the thin-layer graphene aqueous slurry prepared by the preparation method,the graphene is uniformly dispersed in the filler, is stable in storage and good in compatibility with resin and the filler; in the process of mixing with the aqueous resin, emulsion or other fillers, the graphene is difficult to stack and agglomerate due to the blockage of the filler, so that the dispersion effect and efficiency of the thin-layer graphene in a coating is improved, the thin-layergraphene is fully dispersed and spread in the coating, the high-efficiency shielding effect is achieved with low content; and the process is simple, the efficiency is high, and the thin-layer graphene aqueous slurry plays an important role in improving the corrosion resistance of an existing coating based on an aqueous coating.

The invention discloses a risk user identification method. Firstly, a historical risk user sample set in historical activities and a plurality of features of each user in the historical risk user sample set are obtained; then, through risk interception, an undetermined risk user sample set formed by undetermined risk users participating in the current activity of a network live broadcast platformis obtained; weights are iteratively updated for the users in the historical risk user sample set and the users in the undetermined risk user sample set, and based on the multiple features of each user in the historical risk user sample set, the probability that a prediction label of each round of iteration of the user is a risk and a weight adjustment coefficient of each round of iteration of theuser are obtained; and based on the probability that the prediction label of each round of iteration of the user is a risk and the weight adjustment coefficient of each round of iteration of the user, a risk user is identified from the users participating in the current activity of the network live broadcast platform. According to the method, the identification accuracy of risk users in a new activity is higher.

The invention relates to a metallized porous conductive polymer composite material, a preparation method and application thereof, and particularly discloses a preparation method of the metallized porous conductive polymer composite material. The method comprises the following steps of: (1) preparing a conductive filler solution, (2) preparing a porous conductive polymer material, and (3) metallizing the porous conductive polymer material. The invention also discloses the metallized porous conductive polymer composite material prepared by the method. The density of the obtained metallized porous conductive polymer composite material is 0.2-0.8g/cm<3>, the conductivity is 200-5000S/m, and the electromagnetic shielding effectiveness in the X waveband is 60-120dB. According to the invention, the preparation process is simplified, the bonding strength between the metal particles and the polymer is improved, the mechanical strength of the porous polymer composite material is improved, the addition amounts of the polymer and the conductive filler are reduced, and the porous polymer composite material has important application value in the fields of conductive polymer-based composite materials, electromagnetic shielding materials and the like.

The invention discloses a hard X-ray and photoelectron shielding composite material, which comprises an X-ray shielding layer and a photoelectron shielding layer. The photoelectron shielding layer isarranged on two sides or one side of the X-ray shielding layer, the X-ray shielding layer is made of a high Z material, and the photoelectron shielding layer is made of a low Z material. The laminatedfunctional composite material composed of the high-Z material and the low-Z material can effectively shield X-rays and photoelectrons, the influence of the photoelectrons on electronic equipment is reduced, and the problem that an existing hard X-ray shielding material is poor in the shielding performance is solved.

The invention discloses a trapped transparent metal mesh electromagnetic shielding film, which includes a substrate; the upper side of the substrate is provided with a high-light-transmitting resin layer, a plurality of nano magnetic conductive material particles are embedded in the high-light-transmitting resin layer, the invention also discloses a preparation method of the trapped transparent metal mesh electromagnetic shielding film, which adopts a micro-nano processing mode to manufacture a transparent structural substrate, and forms a metal mesh structure inside the structure by using theprinciple of gravure printing, so that the metal structure has a high transmission type and a high weathering resistance; the environment-friendly manufacturing technology is adopted, and the finestmetal line width can reach 1 [mu]m, which has good visual effect; the combination of magnetic conductivity and conductive nanomaterials can effectively improve the shielding effect and widen the shielding range. A variety of grid designs and an analog circuit absorbing array are combined to achieve high-efficient shielding and absorbing effect.

The invention relates to a selective wave point position type anti-blue-ray thin film. The anti-blue-ray thin film comprises an anti-wear layer, anti-blue-ray layers, a substrate layer and a mountingadhesive layer; the anti-wear layer is made of wear-resistant polyurethane; the substrate layer is selected from one of cellulose triacetate and polyethylene glycol terephthalate; each anti-blue-ray layer is selected from three or above of nano-scale silicon dioxide, nano-scale titanium dioxide, nano-scale cerium oxide, nano-scale tin oxide, nano-scale platinum, nano-scale palladium and nano-scalemagnesium fluoride; and the multiple anti-blue-ray layers can be arranged according to needs and can shield blue rays with narrow bandwidth (less than or equal to 5 nm) and with the wavelength at thewave point positions of 411 nm, 430 nm, 440 nm and 450 nm and blue rays with the wavelength of 460-480 nm. The anti-blue-ray thin film has the advantages that (1) a proper blue ray shielding scheme is provided for users of different ages and different using occasions; and (2) the harmful blue rays are efficiently shielded, and meanwhile, the influence on color vision of human eyes is weakened tothe maximum degree, in addition, excessive shielding cannot be caused, and the protection principle of minimization is met.

The invention discloses a high-frequency electromagnetic wave shielding material, and belongs to the technical field of electromagnetic shielding. The shielding material is composed of a release filmlayer, a back adhesive layer, a first alloy layer, a shielding base layer and a second alloy layer which are sequentially stacked. The electromagnetic wave shielding material comprises the shielding base layer, wherein the first alloy layer and the second alloy layer are prepared on the two sides of the shielding base layer respectively; the first alloy layer and the second alloy layer have excellent conduction performance and shielding performance, and especially have efficient shielding effect on high-frequency electromagnetic waves; the thickness of the shielding material is greatly reduced, so that a light and thin structure is achieved while the shielding effect is guaranteed; and the shielding material is simple in structure and easier to produce and prepare, and can be widely applied to connecting lines of a mobile terminal, a computer, medical equipment, a vehicle-mounted electric control system, a displayer and the like.

The invention relates to a curtain fabric and belongs to the field of textile fabrics. The curtain fabric comprises a curtain fabric main body (1), wherein the curtain fabric main body (1) is formed by twisted textile fibers and stainless steel wires, wherein diameter of each stainless steel wire is phi 0.025mm, the stainless steel wires are of filaments; a plurality of V-shaped or arc-shaped cracks (2) are arranged on the curtain fabric main body (1). The plurality of V-shaped or arc-shaped cracks are arranged on the curtain fabric main body, so that, after a curtain is spread and a window is opened, the wind enters through the cracks to balance air pressure of both sides of the curtain, ventilation is realized, and the curtain is prevented from waving along with the wind; a part of ray can enter the room through the cracks to meet an illumination demand in a room. In addition, with the adoption of the anti-radiation fabric knitted by metal wires and cotton, the curtain fabric is high in shielding effect, excellent in durability, resistant to washing, resistant to a high temperature, and soft and breathable.

The invention provides a self-gel-breaking fiber fracturing fluid as well as a preparation method and application thereof. The self-gel-breaking fiber fracturing fluid is prepared from the following components in parts by weight: 100 parts of water, 0.05 to 0.20 part of a surface active thickening agent, 0.5 to 2.0 parts of anti-swelling agent, 0.01 to 0.03 part of a capsule type gel breaker and 0.3 to 1.5 parts of a degradable fiber. The self-gel-breaking fiber fracturing fluid provided by the invention is suitable for diverting fracturing transformation of a natural fracture development reservoir, has good shielding and temporary plugging capability, can divert the fracturing fluid to more ground waves and low-permeability production layers, and improves transformation effect; and meanwhile, the preparation method of the self-gel-breaking fiber fracturing fluid is simple, a fracturing process can be simpler due to the self-gel-breaking characteristic of the self-gel-breaking fiber fracturing fluid, and a fracturing construction period can be shortened.