5 results about "Radiation reaction" patented technology

The invention relates to the technical field of chemical synthesis processes of medicines, in particular to a preparation process of isocoline hydrochloride and application of the isocoline hydrochloride in eye drops, and solves the technical problems of various steps, low yield, high cost, serious environmental pollution and the like of an existing preparation process. A microwave synergistic palladium catalytic synthesis technology is adopted, 2-chloro-3-methylpyridine, phenylboronic acid and potassium carbonate are subjected to a microwave radiation reaction in an ethanol-water mixed solvent in the presence of a palladium catalyst, the power density is 0.15-0.25 W / mL, the reaction temperature is 120-140 DEG C, the reaction pressure is 0.2-0.5 MPa, the reaction time is 4.0-6.0 hours, and the isolorydine hydrochloride is obtained through cooling crystallization, filtering washing, drying and salifying treatment. According to the process, traditional 8-10-step synthesis is simplified into one-step reaction, the total yield is increased to 62.5% from 45%, the product purity reaches 99.2%, and the stability of the preparation is remarkably improved.

The invention provides a cyclic production method of medical isotope 67Cu, which comprises the following steps: S1, carrying out radiation reaction on a target material solution containing 68Zn or 67Zn in a reactor to obtain a target material solution containing 67Cu; s2, the solution containing the 67Cu target material is introduced into a first extraction unit, and 67Cu is adsorbed and enriched through a chromatographic column; when the first extraction unit reaches an adsorption limit value, the 67Cu-containing target material solution is introduced into a second extraction unit, and adsorption and enrichment of 67Cu are continued by using a chromatographic column; in the adsorption and enrichment process, the solution subjected to adsorption and enrichment returns to the reactor again for irradiation reaction; the adsorption-irradiation operation is circulated; and S3, alternately desorbing 67Cu obtained through online enrichment and separation of the first extraction sheet and the second extraction sheet, purifying the 67Cu through a separation column filled with anion exchange resin or extraction resin, and removing residual 68Zn or 67Zn and other impurities to obtain a 67Cu solution with high nuclear purity, high specific activity and high radiochemical purity.

This invention discloses a highly ordered micron-shaped flower material with three phases coexisting: tetragonal scheelite-type BiVO4, monoclinic BiVO4, and [Bi6O5(OH)3](NO3)5·3H2O, and its control method. The method includes: preparing a mixed solution A of bismuth nitrate and hexadecyltrimethylammonium bromide and a solution B of ammonium metavanadate using deionized water as a solvent; adding mixed solution A dropwise to solution B under vigorous stirring to obtain a reaction precursor solution C; placing solution C in a microwave reactor and performing a microwave radiation reaction at 100°C without pH adjustment to obtain a solid-liquid suspension sample; and centrifuging, washing, and drying the sample to obtain the three-phase coexisting product. This invention utilizes microwave radiation technology to control the morphology and composition of the product without the need for acid or alkali conditions. The method is simple, efficient, and energy-saving.

The preparation method comprises the following steps: mixing, grinding and uniformly dispersing an organic carbon source and a fluorine source, transferring into a reaction kettle, carrying out a microwave radiation reaction, dispersing reactants into deionized water after the reaction is finished, adding a saturated sodium hydride carbonate aqueous solution, and carrying out suction filtration, washing and drying to obtain nitrogen-doped carbon dots; the preparation method comprises the following steps: dispersing soluble nickel salt and lauryl sodium sulfate in ethylene glycol, uniformly dispersing, heating to 50-70 DEG C, regulating the pH value to 11-13, dropwise adding hydrazine hydrate, heating to 70-90 DEG C after a reaction system becomes black, stirring to react for 3-4 hours, and filtering, washing and drying to obtain nano nickel powder after the reaction is finished; the fluorine-doped carbon dots and nano nickel powder are dispersed in water, and then the nano nickel powder composite carbon dots are obtained through filtering and drying. The preparation method comprises the following steps: dispersing nano nickel powder composite carbon dots in a silica gel component A, then adding a silica gel component B, preparing a film on a polyethylene film, and after curing, covering the surface of the film with a layer of polyethylene film to obtain the adhesive tape.

A method for predicting the sound radiation of a flexible layer laid water flow structure, the sound radiation calculation model of the flexible layer laid water flow structure is divided into model one and model two, the four-terminal acoustic impedance parameters are used to describe the relationship between the sound pressure and the vibration velocity of the inner and outer surfaces of the flexible layer, and the non-coherent wall plane wave superposition method is used to process the fluctuating pressure excitation of the turbulent boundary layer. Model one solves the vibration response of the outer surface and the excitation force transmitted to the inner surface under the assumption that the inner surface of the flexible layer is fixed; model two establishes a coupling equation to solve the vibration response by taking the excitation force as the structure input and considering the sound radiation reaction of the outer surface; and the complete sound radiation power is obtained by linearly superimposing the results of the two models. The present application can accurately describe the physical process of the flow-induced load transmitted to the surface of the structure through the flexible layer, realize the unified vibration-sound coupling solution of the flexible layer laid structure under the action of the outer surface flow-induced load, and provide an efficient and accurate new method for predicting the sound radiation of the flexible layer laid water flow structure in engineering.