31results about How to "No complex post-processing required" patented technology

The invention discloses a photon-number distinguishable detection-based true random number generator and belongs to the class of quantum secure communication. Different photon-number incident events are combined into a 2-bit random number sequence according to the uncertainty principle of poisson distribution by using the characteristics of a photon-number distinguishable detector capable of distinguishing incident photon numbers. The true random number generator mainly comprises a photon-number distinguishable detection module, a photon-number identifying and processing module and a random number acquisition module and can generate high-speed random secret keys needed in the quantum secure communication. The true random number generator has stable and reliable random sources; the generated true random number cannot be repeated or deciphered by the random characteristics of light quanta; a complex post-processing procedure is not needed; and the true random number generator is convenient to use.

The invention relates to a method for producing 2-amino-4-acetamido benzene alkyl ether by reduction with sodium bisulfide. The method comprises the following steps: adding 2-nitro-4-acetamido benzene alkyl ether in water the mass of which is 3-5 times of that of a reactant; adding glacial acetic acid; regulating the pH value of the material to 5-6 by using liquid caustic soda; raising the temperature to 90-105 DEG C, dropwise adding a 10-25% sodium bisulfide solution, carrying out insulation reaction for 1 hour after dropwise addition; cooling slowly to crystallize and separate out the product; filtering the crystal, washing the crystal with cold water until the pH value of the filtrate is 7 to obtain 2-amino-4-acetamido benzene alkyl ether, wherein the washing sleeve is still used in the next-batch reduction. The method disclosed by the invention has the advantages that (1) the reaction yield is above 90%; (2) the reaction speed is high so that the product is not easy to oxidize, and has good colour and high quality; (3) complex aftertreatment is not required, and the equipment and operation are simple; (4) wastewater is little and easy to treat, thus the method is a low-emission clean process; and (5) resource utilization is realized for recycling and managing hydrogen sulfide waste gas so as to obtain the sodium bisulfide solution in industries such as petrifaction industry, and cost is low.

The invention discloses a method for preparing high-strength α-titanium gypsum by utilizing industrial waste titanium dioxide waste residue, specifically: adding water to finely ground titanium dioxide waste residue to prepare slurry, adding a composite nucleating agent to the slurry and adjusting pH value to 1.0 to 5.5, then add it to the reaction kettle, stir and continue to feed oxygen, heat to a slight boiling state, constant temperature dehydration and crystallization, after the reaction is completed, the prepared solution is filtered under reduced pressure, and successively use boiling water and ethanol Wash and dry to obtain short hexagonal α-titanium gypsum crystals, sieve the obtained crystals and make 15-30% of 10-30 μm, 50-75% of 30-80 μm, and 10-20% of 80-200 μm. The high-strength α-titanium gypsum with an average particle size of 20-60 μm, a compressive strength of more than 70 MPa, regular shape and uniform size can be obtained. The method has the advantages of simple process, low cost and high efficiency.

Belonging to the field of inorganic oxide powder materials, the invention discloses a preparation method of a spinel-type porous high entropy oxide material. The method is low temperature combustion synthesis method. Specifically, a metal nitrate is adopted as the metal source, one of or a mixture of several of citric acid, ethylenediamine tetraacetic acid, hexamethylenetetramine and glucose is adopted as the fuel, by controlling the concentration of the metal salt raw materials, the fuel type and adding amount, the combustion improver type and adding amount, and the ignition way, the granularity, morphology and other characteristics of the spinel-type transition metal high entropy oxide (CoCrFeMnNi)3O4 nanopowder can be regulated. The preparation method adopts liquid phase compounding toensure molecular level uniform mixing of the raw materials, and the product achieves stoichiometric ratio. At the same time, the method has the advantages of energy saving, high production efficiency,green and environmental protection, no need for complicated post-treatment and the like. The high entropy oxide powder prepared by the method provided by the invention has high purity and uniform particle size distribution.

The invention relates to a green-sensitive photopolymer composition and a grating. The composition includes the following components: a polymerization active monomer; a dye compound, which has excitation activity at least near the wavelength of 532nm light; agents; film-forming components and plasticizers. The refractive index difference (n 聚合活性单体 ‑n 成膜组分 ) value above 0.075. Compared with the existing holographic recording photopolymer materials, the grating obtained based on the composition of the present invention has higher refractive index modulation degree, exposure sensitivity and light transmittance, and has improved diffraction efficiency at the same time, and preferably With improved size shrinkage, in addition, the photosensitive material of the present invention has wider angle selectivity and is less affected by environmental humidity.

The invention provides a novel simple biomolecule fixing method, comprising the following steps: firstly synthesizing a metal nano material by a liquid-liquid interface method; then adding biomolecules to a water phase for fixing the biomolecules to the liquid-liquid interface by a bonding action, thus obtaining a composite membrane of the metal nano material and the biomolecules; and finally, extracting the biomolecule-metal composite monodisperse membrane on the liquid-liquid interface by a langmuir technology or directly by a solid substrate. The method for fixing biomolecules provided by the invention has a simple preparation process for forming the biomolecule-metal nano composite material, and has the characteristic that the biomolecules are dispersed in order in a single layer and have good stability.

The invention discloses a method for preparing a melamine molecularly imprinted polymer by virtue of distillation, precipitation and polymerization. The method comprises the following steps: (1) dissolving melamine, a polymerization reaction monomer and divinylbenzene in acetonitrile, and standing; (2) adding an initiating agent into the solution of the step (1), removing oxygen, and heating to distill acetonitrile; and (3) after the distillation in the step (2), filtering the reaction solution, performing refluxing extraction on filter residues by using a methanol-acetic acid mixed solution, and drying to obtain the melamine molecularly imprinted polymer. By adopting the method disclosed by the invention, the problems that the molecularly imprinted polymer obtained by the conventional method is non-uniform in particle size, difficult in size control and low in binding capacity; the method disclosed by the invention is simple to operate and does not need a complex after-treatment process, and the obtained molecularly imprinted polymer microspheres have good monodispersity and binding capacity of 32-44mg / g, and can be used for separating and detecting melamine in a sample.

The invention discloses a preparation method of a rare-earth-based fluorite type high-entropy oxide powder material and belongs to the field of rare earth oxide powder materials. The method is a low-temperature combustion synthesis method and specifically comprises the following steps: taking rare earth nitride as a metal source and one or a mixture of more of urea, acetic acid, ammonium acetate,oxalic acid and glycine as fuel; and controlling the concentration of metal salt raw materials, types and adding amounts of the fuel, types and adding amounts of a combustion improver and an ignitionmanner to regulate and control properties including granularity, shapes and the like of rare-earth-based fluorite type high-entropy oxide powder. According to the preparation method disclosed by the invention, liquid-phase ingredients are adopted to ensure that a molecular level of the raw materials is uniform and a stoichiometric proportion of a product is realized; meanwhile, the preparation method has the advantages of energy source saving, high production efficiency, greenness and environment protection, no need of complicated post-treatment and the like; and the prepared rare earth oxidepowder has the advantages of high purity, small granularity and uniformity in distribution.

The invention discloses a method for preparing rare earth-doped yttrium oxide fluorescent nanoparticles by DBD technology, the method comprising the following steps: (1) base metal organic matter and doped metal organic matter are carried out at a mass ratio of 10 to 40:1. Mixing, the mixture is ground as a reaction precursor; (2) the precursor obtained in step (1) is placed in a container, and the container is placed between the positive and negative electrodes of the plasma reactor; (3) after that, under an oxygen atmosphere, An alternating current is applied between the cathode and anode of the plasma reactor, the precursor is treated for a period of time, and the product is taken out and ground at intervals to obtain a powder containing rare earth-doped yttrium oxide nanoparticles. The invention adopts the DBD technique to prepare the powder of the rare earth-doped yttrium oxide fluorescent nano-particles by using the highly active oxidizing component in a one-step method. The method is simple and easy, green and efficient, and does not require further reaction under high temperature and high pressure, effectively reducing energy consumption.