Abstract: Described herein is a method for preparing acesulfame potassium, comprising: adding triethylamine to a sulfamic acid solution, and carrying out an amination reaction to produce a sulfamic acid ammonium salt solution; adding diketene to the obtained sulfamic acid ammonium salt solution, and under the action of a solid superacid catalyst, carrying out an acylation reaction to obtain an intermediate solution; dissolving sulfur trioxide in a solvent to form a cyclizing agent solution; adding the cyclizing agent solution to the intermediate solution, and carrying out a sulfonation cyclization reaction to obtain a cyclized product solution; adding a hydrolysis agent to the cyclized product solution, and carrying out a hydrolysis reaction to obtain a hydrolysis product solution; and adding a potassium hydroxide solution to the organic phase of the hydrolysis product solution to obtain acesulfame potassium.

Abstract: Described herein is a method for preparing acesulfame potassium, comprising: pressing an acetoacetamide-N-sulfonic acid triethylamine salt solution and a cyclizing agent solution into a Venturireactor via different inlets, mixing same at a mixing section and a diffusion section of the Venturireactor, and then injecting the obtained mixture into a flow reactor, wherein the cyclizing agent solution is formed by dissolving sulfur trioxide in a first organic solvent; subjecting the mixture passing through the flow reactor to a sulfonation cyclization reaction under the action of a supported solid base heterogeneous catalyst preset in the flow reactor, and entering the obtained sulfonated cyclized product into a hydrolysis reactor; subjecting the sulfonated cyclized product and a hydrolysis agent preset in the hydrolysis reactor to a hydrolysis reaction to obtain a hydrolysis product solution; and adding potassium hydroxide into an organic phase of the hydrolysate solution for a salt-forming reaction to obtain the

Abstract: The present disclosure discloses a rolling ring shrink fitting tool for rotary equipment, including a lifting frame; a movement slot is formed in a bottom surface of a top of the lifting frame; an output end of a first motor is connected with a main gear; guide rollers are embedded in a lifting seat through bearings; shrink fitting plates are two semicircular structures; lifting lugs are welded on outer sides of the shrink fitting plates; tooth rings are arranged outside the shrink fitting plates; stop rods are fixed on inner walls of the tooth rings; supporting screw rods are embedded at sunken positions on inner walls of the shrink fitting plates through bearings.

Abstract: An optical fiber measurement system includes an optical time-domain reflectometer, a wavelength division multiplexer, and a signal generator. The signal generator sends a signal light ray to the wavelength division multiplexer. The optical time-domain reflectometer sends two measurement light rays whose wavelengths are respectively longer than and shorter than a wavelength of the signal light ray to the wavelength division multiplexer. The wavelength division multiplexer combines the two measurement light rays and the signal light ray, sends a combined light ray to an optical fiber, and sends a light ray returned by the optical fiber to the optical time-domain reflectometer, so that the optical time-domain reflectometer determines performance of the optical fiber based on the returned light ray.

Abstract: An electric motor includes an end turn ring and a cooling structure that is in a thermally conductive relationship with the end turn ring.

Abstract: Stable, macroscopic single-crystal chiral liquid crystal compositions are described. The compositions include a single-crystal chiral liquid crystal material on a patterned surface. The patterned surface seeds a particular crystallographic orientation at the substrate-liquid crystal interface. Also described are methods of forming the single-crystal chiral liquid crystal compositions.

Abstract: This invention relates to the technical field of harmonic elimination for ferromagnetic resonance for a voltage transformer (abbreviated as PT), in particular, to a harmonic elimination method for ferromagnetic resonance for an active resistance-matching voltage transformer based on PID-adjustment, including compiling a resistance matching algorithm; designing and building a harmonic elimination control system based on the PID control strategy; presetting an active resistance-matching strategy; designing an engineering scheme for placing resistors.

Abstract: An aluminum borate whisker reinforced and toughened non-metallic matrix composite is provided, which specifically includes a non-metallic material reinforced and toughened with aluminum borate whiskers. The composite exhibits a higher bending strength and fracture toughness and a higher wear resistance. A method for preparing the composite is also provided. The method includes mixing the aluminum borate whiskers and the non-metallic material to form a mixture; and sintering the mixture by a vacuum hot press method, or molding the mixture.

Abstract: A crystal-growth controlling method and device, and a crystal growing apparatus, used for, in the process of growing a crystal by a pulling method, forming the crystal of the shape required by the cell side. The method includes: in a process of growing a crystal by the pulling method, acquiring a growth image of the crystal in real time, and extracting shape information of the crystal at a growth interface from the growth image, wherein the growth interface is where the crystal intersects with a raw-material melt liquid level; comparing the shape information of the crystal at the growth interface with shape information of the predetermined shape, to obtain a comparison result; and based on the comparison result, adjusting a shape of the crystal at the growth interface by using a laser.

Abstract: The present invention discloses mutant strains of Amycolatopsis sp. ATCC 39116 suitable for the production of natural vanillin using ferulic acid as a feedstock. More specifically, the present invention discloses mutant strains having mutations that reduce the degradation of vanillin to vanillic acid.

Abstract: A chemical mutagenic approach and a screening protocol were followed to select mutant strains of Amycolatopsis sp. with the ability to produce natural vanillin at high yields without any lag period. The resulting mutant strains are free of any exogeneous genetic elements and can be qualified as non-genetically modified organisms (non-GMOs) for regulatory purposes.

Abstract: The present disclosure generally relates to the production of natural vanillin by biocouversion using isoeugenol as the substrate. More specifically, the present methods utilize a filitgal isoeugenol monooxygenase to catalyze the bioconversion of isoeugenol to vanillin, which can be carried out in a cellular system (e.g., bacteria or yeasts) or in an enzymatic reaction mixture without a cellular system.

Abstract: Embodiments of the present disclosure provide a broadcast-multicast service session transmission control method and device. The broadcast-multicast service session transmission control method performed by a user equipment (UE) includes: receiving session state information of a broadcast-multicast service session, transmitted by an access network device; and stopping monitoring a data transmission channel of the broadcast-multicast service session, in case that the session state information indicates that the broadcast-multicast service session is in a release state. Thus, in the embodiments of the present disclosure, when the MBS session is in the release state, the access network device can notify the UE in the MBS session that the MBS session is in the release state, so that the UE can no longer monitor a data transmission channel of the MBS session, thereby saving the power.

Abstract: The present disclosure generally relates to the production of natural vanillin by bioconversion using isoeugenol as the substrate. More specifically, the present methods utilize a fungal isoeugenol monooxygenase encoded by VpIEM gene from Violaceomyces palustris to catalyze the bioconversion of isoeugenol to vanillin, which can be carried out in a cellular system (e.g., bacteria or yeasts) or in an enzymatic reaction mixture without a cellular system.

Abstract: An optical signal amplification apparatus includes a power detection module, a pump control module, and a Raman amplification module. The power detection module is configured to detect power of each of a plurality of G wavelength channels in each of a plurality of N spatial dimensions, and send power configuration information to the pump control module. The pump control module is configured to output N channels of pump light, where each channel of pump light includes M pieces of split pump light of different wavelengths, and a proportion of each piece of split pump light in pump light of a corresponding wavelength is determined based on the power configuration information. The Raman amplification module is configured to perform Raman amplification on a space division multiplexed signal in all of the N spatial dimensions by using the N channels of pump light.

Abstract: A display panel and a display apparatus are provided in the present disclosure.

Abstract: Provided is a method for refining acesulfame potassium (Ace K), including: adding hydrogen peroxide and activated carbon to an Ace K crude product-containing solution to obtain a mixture, maintaining the mixture at a first preset temperature for a first preset time, and filtering the mixture to obtain an Ace K mother liquor; conducting concentration on the Ace K mother liquor to a preset concentration to obtain a concentrated solution, allowing the concentrated solution to stand at a second preset temperature for a second preset time to form an Ace K crystal nucleus, and obtaining a crystal nucleus-containing solution; conducting programmed freezing on the crystal nucleus-containing solution to obtain a solution with a large number of Ace K crystals; and conducting centrifugation, water washing, and drying on the solution with a large number of Ace K crystals to obtain an Ace K crystal product.

Abstract: Disclosed is a method for purifying sucralose, sequentially including: adding sucralose to ultrapure water, heating the resulting mixture for dissolution to obtain a dissolved solution, filtering the dissolved solution to obtain a filtrate, and then extracting the filtrate with an extraction solvent to remove non-polar impurities; subjecting the extracted recrystallization solution to concentration by evaporation to obtain a concentrated recrystallization solution with a preset concentration, and leaving the concentrated recrystallization solution to stand at a preset temperature for a preset time to produce a sucralose crystal nucleus in the concentrated recrystallization solution; subjecting the concentrated recrystallization solution containing the sucralose crystal nucleus to programmed cooling to obtain a recrystallization solution with a large amount of a sucralose crystal; and centrifuging the recrystallization solution with a large amount of a sucralose crystal to obtain a solid, and subjecting the so

Abstract: The present invention relates to a compound of Formula (I) and/or a physiologically acceptable salt, enantiomer, or solvate thereof. Said compound can be used in combination with one or more sweeteners to enhance their individual sweet taste or the overall sweet taste of a composition comprising said one or more sweeteners.