156results about How to "Improve absorption properties" patented technology

The invention relates to a virtual 3D replaying method based on an earphone. The method comprises the following steps: setting a parameter of a virtual 3D sound source; calculating an absorption value of air to sound and calculating a sound pressure attenuation factor of the sound; calculating a room pulse response (RIR); calculating a position distance d between each sample point of the RIR and a receiving point, calculating a sound pressure of the original sound source after being transmitted for the d distance according to the d; using a interpolation method to process an absorption coefficient of a metope frequency point so as to obtain the RIR after increasing air attenuation and metope absorption; calculating a level angle and an elevation angle between a sound source point position and a head position so as to select a proximal head correlation transmission function; carrying out convolution on head-related transfer function (HRTF) and the RIR after increasing the air attenuation and the metope absorption so as to acquire binaural room pulse response (BRIR); carrying out the convolution on the BRIR and an input sound signal so as to realize a virtual 3D sound signal based on the earphone. By using the method provided in the invention, an '' inner head '' problem during earphone replaying, a distance direction feeling problem, a room characteristic problem and the like can be solved so as to realize a virtual 3D effect based on the earphone.

Disclosed are a radiation absorptive material and more particularly a method of economically coating halloysite or other mineral tubules (including nanotubules and microtubules) with a conductive metal (Cu) in order to produce an absorptive composite material capable of providing shielding and attenuation of radio-frequency signals.

To provide inks and ink sets for inkjet recording, which have good fastness and good jet-out stability and which give good images with no bleeding trouble, yellow ink, black ink and magenta ink for inkjet printing contain at least two dyes each having an oxidation potential over 1.0 V (vs SCE).

The invention relates to a large-area perovskite film, a perovskite solar cell module and a manufacturing method. The manufacturing method of the large-area perovskite film comprises the steps of providing an initial solution to a conductive substrate so as to form a film material, wherein perovskite is represented by a general expression ABX3, and a solute of the initial solution at least comprises A, B and X; and applying an anti-solvent to the film material.

The invention relates to an infrared detector and a preparation method thereof. The infrared detector comprises a plurality of detector pixels arranged in an array, and each detector pixel comprises amicro-bridge detector structure and a metamaterial metal layer; the metamaterial metal layer comprises a plurality of metal repeating units arranged in an array, and each metal repeating unit comprises two L-shaped patterned structures arranged diagonally; the infrared absorption spectrum section of the infrared detector is a wave band of 3 microns to 30 microns. By means of the technical scheme,wide-spectrum absorption of the infrared detector is achieved, the absorptivity of the infrared detector to temperature infrared radiation energy of a target object is greatly improved, thus, the infrared detector has high detection sensitivity.

An aircraft cabin panel for sound absorption, with a core layer that comprises a plurality of cells that extend in an open manner across the thickness of the core layer and that are separated from each other by cell walls, and with a first cover layer that faces away from the sound field, as well as a second cover layer that faces towards the sound field and that comprises a plurality of perforation holes. The second cover layer is multi-layered and apart from a layer with the perforation also comprises a second layer that acts as a flow resistance device. The second layer is arranged on the outside, and visually closes off the perforation, and the outer layer comprises an air-permeable woven fabric.

The invention discloses a bismuth-phosphate-based composite photocatalytic material. The bismuth-phosphate-based composite photocatalytic material comprises fluorine-nitrogen-codoped bismuth phosphate, bismuth tungstate and bismuth vanadate at a molar ratio of 1 to (0.1-0.3) to (0.1-0.3). The invention further discloses a preparation method of the bismuth-phosphate-based composite photocatalytic material. The preparation method comprises the steps of dissolving bismuth nitrate pentahydrate in a nitric acid solution, adding a mixed solution of phosphate, ammonium tungstate, ammonium metavanadate and sodium hydroxide solution, and carrying out microwave hydrothermal reaction, centrifugation and drying, so as to obtain the bismuth-phosphate-based composite photocatalytic material. According to the bismuth-phosphate-based composite photocatalytic material, by virtue of codoping of nonmetal fluorine and nitrogen ions, the capacity for capturing electrons at an interface among three semiconductors including bismuth phosphate, bismuth tungstate and bismuth vanadate is effectively improved, and the migration efficiency of electron holes is increased; the three semiconductors are compounded at the interface and can form a heterogeneous structure, so that the separation of photon-generated carriers is effectively promoted, and the photocatalytic activity of a composite system is improved.

Ionic superabsorbent polymers having increased swelling capacity of salt-containing solutions are disclosed. The ionic superabsorbent polymers of the present invention contain an additive to increase the osmotic activity of the polymer in the presence of a salt-containing solution. The additive used in combination with the ionic superabsorbent polymer is capable of forming a zwitterion at a pH of from about 1 to about 9, has a dipole moment greater than that of water, and has a molecular weight less than about 10,000 grams/mole.

The invention relates to an infrared detector and a preparation method thereof, the infrared detector comprises a plurality of detector pixels arranged in an array, each detector pixel comprises an electrode layer, and the electrode layer is provided with a plurality of linear strip structures and a plurality of inflection strip structures. The multiple linear strip structures and the multiple inflection strip structures are alternately arranged in the direction perpendicular to the linear strip structures. The infrared absorption spectrum band of the infrared detector is 8 microns to 24 microns. By means of the technical scheme, wide-spectrum absorption of the infrared detector is achieved, the absorptivity of the infrared detector to temperature infrared radiation energy of a target object is greatly improved, and then the infrared detector has high detection sensitivity.

The invention relates to a method for suppressing parasitic oscillation in a gain medium of a grazing incidence plate strip. According to the method, a layer of dielectric material is plated on three non-light-through surfaces of the grazing incident plate strip, and the dielectric material shows the absorption characteristic on the parasitic oscillation of the gain medium. The method is simple and is wide in application range, and a better suppression effect on the parasitic oscillation is exerted. A plate strip crystal comprises six surfaces, the parasitic oscillation in the crystal can be enhanced by reflection or scattering of each surface, thus, an absorption medium is plated on all other surfaces except a pumping surface and a light through surface, and a parasitic oscillation loop is cut off to achieve an absorption effect. By the method, the parasitic oscillation of the gain medium with such structure can be effectively suppressed, the energy storage and the gain of the gain medium are improved, the amplified spontaneous radiation (ASE) of a system is reduced, and the output light pulse energy is improved. The method belongs to the technical field of laser.

The invention relates to a photocatalyst, which relates to a visible light responded AgX/Ag2CO3(X=C1, I)composite photocatalyst and its preparation method. The preparation method comprises the following steps: placing silver carbonate in an aqueous solution and ultrasonically dispersing to obtain a dispersion liquid of silver carbonate; fully dissolving halogenated ionic liquid in deionized water, heating in water bath and uniformly stirring, dropping the halogenated ionic liquid in the dispersion liquid of silver carbonate, continuously stirring for a while after dropping; after the reaction is completed, cooling to the room temperature, washing the products obtained in the reaction, and drying to obtain the photocatalyst. The preparation method has the advantages of simple process, and can effectively degrade a colored dye (methylthionine chloride) under visible light irradiation. The method uses good control synthesis function of the ionic liquid, better disperses AgX on an Ag2CO3 matrix, so that a purpose of enhancing the degradation performance of the photocatalysis.

The invention provides composite water absorbent paper for an absorbent product. The composite water absorbent paper for the absorbent product comprises an upper isolation layer, macromolecular water absorbent resin, a high-fluffy nonwoven fabric and a lower isolation layer, wherein the macromolecular water absorbent resin comprises upper macromolecular water absorbent resin which is distributed between the upper isolation layer and the high-fluffy nonwoven fabric, and lower macromolecular water absorbent resin which is distributed between the high-fluffy nonwoven fabric and the lower isolation layer; the upper isolation layer, the upper macromolecular water absorbent resin, the high-fluffy nonwoven fabric, the lower macromolecular water absorbent resin and the lower isolation layer are combined together in a gluing or heat sealing manner; the composite water absorbent paper is characterized in that the particle size of the upper macromolecular water absorbent resin is different from that of the lower macromolecular water absorbent resin; the particle size of the lower macromolecular water absorbent resin is smaller than that of the upper macromolecular water absorbent resin. According to the composite water absorbent paper for the absorbent product, the absorption performance of the water absorbent paper can be remarkably improved; the utilization rate of macromolecules is improved; the production cost is reduced.

An absorbent material which comprises an absorbent resin containing a polyacidic amino acid as a constituent component of the resin and having a structure in which primary particles are agglomerated and including pores having a total pore volume as measured by a mercury penetration method of 0.5 to 5.0 cm<3>/g.

The present invention provides a dual-band visible light broadband absorption structure. The structure comprises a substrate; a metal layer arranged on the substrate; a metal grating layer arranged on the metal layer, wherein the metal grating layer is a one-dimensional grating and comprises a plurality of grating units, grating grooves are formed between each two adjacent grating units, the period of the metal grating layer is not larger than 500nm, the duty ratio of the metal grating layer is between 0.1 and 0.7, the height of the metal grating layer is between 100-500nm, and the imaginary part of the dielectric constant is larger than the absolute value of the real part of the dielectric constant in the metal grating layer; and a filling dielectric layer located in the grating grooves. The present invention further provides a preparation method of the dual-band visible light broadband absorption structure. Compared to the prior art, the structure is simple, the absorption efficiency is high (up to nearly 100%) in the wide incident angle changing range of 0-60 degrees, and dual-bandwidth absorption the TM polarized light and the TE polarized light can be realized.

The invention provides an anti-ultraviolet polyamide color master batch and a preparation method of a functional fiber. The anti-ultraviolet polyamide color master batch comprises polyamide powder, adispersing agent, anti-ultraviolet colorant nanopowder, a flame retardant and an antioxidant. A preparation process of the anti-ultraviolet colorant nanopowder comprises the following steps: step 1, adding perylenetetracarboxylic acid-bis-(3,5-dimethylphenyl)imide, cerium sulfide and a titanate coupling agent into absolute ethyl alcohol, carrying out stirring, and then carrying out centrifuging toobtain a colorant pre-dispersion; 2, dissolving antimony chloride into pure acetic acid to prepare a transparent precursor solution, subjecting the transparent precursor solution to reacting at 300 DEG C in virtue of carrier gas by using a spraying thermal decomposition method so as to generate antimony trioxide, repeatedly and uniformly spraying the transparent precursor solution into the colorant pre-dispersion so as to coat the colorant pre-dispersion with the antimony trioxide generated by the reaction, and carrying out vacuum drying to obtain the anti-ultraviolet colorant nanopowder. According to the method for preparing the polyamide functional fiber, the problems of low color fastness and industrial three wastes of the polyamide fiber in the prior art are solved.

This method for producing the carbonized fabric includes thermally carbonizing a woven fabric, a knitted fabric or a woven and knitted fabric composed of cellulosic fiber yarns as a raw material fiber fabric. The method includes restraining and holding the dried raw material fiber fabric having a water content of less than 25% from one of the longitudinal and transverse directions of the fabric, and then heating the fabric in the restrained and held state in a temperature range of 250-450[deg.]C at a temperature-rising rate of 50-200[deg.]C/hr in an oxidizing atmosphere having an oxygen fractional pressure of 50 mmHg or greater in a heating oven, continuously heating the fabric at a temperature-rising rate of 50-200[deg.]C/hr to a final heating temperature range of 750-1,000[deg.]C in a non-oxidizing atmosphere having an oxygen fractional pressure of less than 50 mmHg, and then heating the fabric at the final heating temperature for a prescribed time. Accordingly, the invention provides a method for producing a carbonized fabric, by which the carbonized fabric having excellent electromagnetic wave absorbability, electric characteristics or dielectric characteristics, heat resistance, mechanical strength, flexibility and the like, can relatively easily and economically be produced.

The invention discloses a selenium-enriched high-yield planting method for chillies, and belongs to the technical field of planting. The method specially includes the following steps that (1) chilli seedlings are prepared; (2) field planting pretreatment of chilli grown-up seedlings is performed; and (3) the chilli grown-up seedlings are subjected to field planting. By the adoption of the method, the characteristics of the chilli grown-up seedlings are well improved, the selenium content of the chillies cultivated ultimately is increased by 5 times or above, the zinc content is increased by 2 times or above, and the content of ferrum, manganese and calcium elements is increased by about 20%; and moreover, the yield of the chillies per mu is increased by about 30%, planting benefits are enhanced obviously, and the promotional value is great.

The invention relates to the field of a semiconductor photoelectronic material, is applied to the preparation of doped black silicon, and specifically discloses a method for preparing a doped black silicon microstructure through a femtosecond laser radiation method after the doped film layer is prepared. According to the preparation method, a target material fitting mode and a magnetron sputtering method are adopted to deposit a silicon-doped film layer on the surface of a clean silicon substrate; then a surface microstructure is prepared through femtosecond laser radiation; the surface microstructure is thermally annealed under an atmosphere environment to obtain the doped black silicon material, wherein the doped black silicon material has a certain high absorption characteristic on light with the wavebands of 400-2,400nm; the absorption rate of the doped black silicon material on the visible light wavebands of 400-1,100nm can reach 95%, and the absorption rate of the doped black silicon material on the near infrared wavebands of 1,100-2,400nm can reach 90%, so that technological foundation for expanding the application of the black silicon material is established. Compared with the prior art, the types of the doped elements are enriched due to the solid film layer doping mode; and meanwhile, the doping concentration is improved, the doping cost is lowered, the process steps are reduced, and the preparation efficiency is improved.