Abstract: A photoelectric fluid field cluster catalytic method for atomic-scale deterministic processing, comprises the following steps: selecting nanoparticles with photocatalytic activity as a photocatalytic medium, and using a photoreduction method to realize the precipitation of metal nanoparticles on a surface of the photocatalytic medium, thus creating photoelectrocatalytic clusters; illuminating a coupling area between a surface to be processed of a workpiece, the photoelectrocatalytic clusters and a flexible tool with a catalytic light source, and simultaneously applying a bias voltage to a conductive tray of the workpiece; and applying a normal load to a flexible tool head and setting a rotation speed to generate a hydrodynamic pressure to drive a polishing solution to flow, thus enabling controllable removal with atomic-level precision.

Abstract: A device for multi-energy field induced atomic-scale CNC machining in an environmental atmosphere comprises an electromagnetic shielding chamber and a control mechanism, wherein an environmental chamber is arranged in the electromagnetic shielding chamber, a workpiece platform is arranged at the bottom of the environmental chamber, and a nanotool driven by a nanotool actuator is arranged at the top of the environmental chamber, and a gas inlet and a gas outlet which are connected to the environmental chamber are formed in the electromagnetic shielding chamber; and the control mechanism is used for controlling the workpiece platform and the nanotool actuator and applying energy fields including a force field, a temperature field, an electric field, an optical field and a magnetic field. The device has the advantages of atomic precision, high efficiency, low cost and good universality.

Abstract: Provided herein is 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-7,7?-diol, which is a compound represented by formula I, or an enantiomer or a raceme thereof. The is prepared with a 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-7,7?-diol 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-7,7?-dicarbaldehyde derivative as a starting material through a Baeyer-Villiger oxidation rearrangement reaction and an alkaline hydrolysis reaction. The 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-7,7?-diol comprises two gem-dimethyl groups and is a key intermediate for preparing corresponding 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-based monophosphine ligands, such as phosphonite ligands, phosphite ligands, phosphoramidite ester ligands, phosphoric acid and phsophonamidate. The 3,3,3?,3?-tetramethyl-1,1?-spirobiindane-7,7?-diol skeleton provided herein could be used in chemical industry and has economic practicality and industrial application prospects.

Abstract: A data encoding method includes obtaining an attribute residual of a current point cloud point, binarizing the attribute residual to obtain a binary code of the current point cloud point that includes a first binary code indicating a first flag bit and a second binary code indicating a second flag bit, selecting a first context model from a context model list according to a first condition, selecting a second context model from the context model list according to a second condition, encoding the first binary code using the first context model, and encoding the second binary code using the second context model. The first condition and the second condition are different for the first context model and the second context model corresponding to a same index in the context model list.

Abstract: A multi-waveband-tunable multi-scale meta-material and a preparation method and a spectral detection method thereof are provided. The meta-material includes a stretchable layer, a non-stretchable support layer, a metal layer, and a nanoparticle layer sequentially stacked from bottom to top. The stretchable layer is a polydimethylsiloxane (PDMS) layer. The non-stretchable support layer is a polyimide (PI) layer. The metal layer is a gold layer. The nanoparticle layer is modified with a hydrophobic group. The preparation method includes vacuum-evaporating fluorosilane on a silicon wafer, spin-coating PDMS, heat-curing PDMS, conducting plasma cleaning, spin-coating and curing PI, sputtering gold, self-assembling the nanoparticles on a water surface to form the nanoparticle layer, transferring the nanoparticle layer to the metal layer, and etching according to a pattern.

Abstract: Disclosed is a non-blind-area multi-view panoramic stereo imaging device. The device comprises a front lens assembly or a plane mirror, an aspheric mirror, a middle lens assembly, a panoramic block, a rear lens assembly and an image surface which are longitudinally arranged along an optical axis. The aspheric mirror comprises a central hole and an annular reflecting surface. The panoramic block comprises a front central circular transmission surface, a front reflecting surface, a front transmission surface, a rear reflecting surface and a rear transmission surface. The front reflecting surface, the front transmission surface and the rear reflecting surface are all annular surfaces. The inner edge of the front reflecting surface is connected with the edge of the front central circular transmission surface.

Abstract: An online observation method of an anode nitrogen concentration for a proton exchange membrane fuel cell is disclosed. Firstly, a dynamic model of anode nitrogen concentration is established based on a gas transmembrane penetration model and an anode material conservation model of a fuel cell, and then an average voltage degradation value between a nitrogen partial pressure and an average monolithic cell voltage is obtained as online feedback information, an online observer of anode nitrogen concentration is established based on the dynamic model of anode nitrogen concentration and the online feedback information, and the anode nitrogen concentration of the fuel cell is obtained by the online observer. The new method solves the problem of online observation of anode nitrogen concentration during the operation of a proton exchange membrane fuel cell engine system under dynamic conditions.

Abstract: Amine-supported mesoporous carbon and a preparation method and use thereof are provided.

Abstract: Disclosed is a method for fast automatic calibration of a phased array based on a residual neural network. A phase setting matrix is set and an amplitude and a phase of a array far-field complex signal are measured with a network analyzer to obtain an amplitude and phase vector of the array far-field complex signal. A real part, an imaginary part, and a magnitude of the far-field measured complex signal value are separated and normalized, and mapped to RGB three-channel image data. Datasets are automatically generated according to a preset amplitude-phase error range by a simulation software, the datasets are proportionally divided into a training set and a test set to be input into the residual neural network for training to obtain a calibration model. Measured data is input into the calibration model for automatic estimation of the amplitude-phase error of the phased array.

Abstract: A packaging material for the non-destructive detection of food quality, a preparation method of the packaging material, and a detection method using the packaging material are provided. The packaging material includes a film material covering the outside of the food, where the film material includes a flexible base layer, an adhesive layer, a transparent conductive layer, and a nanostructured layer which are sequentially stacked from the outer side to the inner side. The flexible base layer is a polydimethylsiloxane (PDMS) layer. The adhesive layer is a polyimide (PI) layer. The transparent conductive layer is an indium tin oxide (ITO) layer. The nanostructured layer is a silver nanoparticles layer. The preparation method includes spin-coating and curing PI on PDMS, sputtering ITO, self-assembling silver nanoparticles on the transparent conductive layer, and etching according to a pattern.

Abstract: The present disclosure relates to a device and process for preparing sebacic acid through electromagnetic induction heating coupled with dry constant-temperature alkaline hydrolysis. The device includes an electromagnetic heating cylinder and a reaction kettle arranged in the electromagnetic heating cylinder, heat storage pellets fill space between the reaction kettle and the electromagnetic heating cylinder, and the heat storage pellets adhere to an inner wall of the electromagnetic heating cylinder and an outer wall of the reaction kettle. The upper end of the reaction kettle is provided with a feeding port, a gas outlet and a temperature measuring port, the reaction kettle is also provided with a stirring device, a lower portion of the reaction kettle is provided with a discharging port, and the feeding port, the gas outlet, the temperature measuring port and the discharging port all extend out of the thermal insulation cotton.

Abstract: The present disclosure belongs to the technical field of purification, and particularly relates to a method for purifying an antimony chloride solution through arsenic removal. The method includes: 1) adding copper-antimony alloy into a crude arsenic-containing antimony chloride solution to be treated in a protective atmosphere to obtain an antimony chloride solution containing low-concentration arsenic impurities after a reaction; and 2) performing distillation and concentration on the antimony chloride solution containing low-concentration arsenic impurities to obtain a high-purity antimony chloride solution.

Abstract: The present invention relates to a phosphorescent material and the use thereof, and more particularly to a cyclic tetradentate metal platinum (II) complex phosphorescent material and the use thereof. The present invention provides a cyclic tetradentate metal platinum (II) complex phosphorescent material based on 8-phenylquinoline, benzoxazole, and phenoxy groups. It is a novel tetradentate platinum (II) complex with a 6/6/6 metal fused ring structure. The phosphorescent material of the tetradentate fused ring structure system of the present invention has the characteristics of easy modulation of HOMO and LUMO orbital energy levels and strong luminescence. It has good chemical stability and thermal stability and is easy to fabricate evaporation-type OLED devices. The organic electroluminescent device fabricated using the compound of the present invention as a light-emitting layer can reduce the start-up voltage and remarkably improve the external quantum efficiency.

Abstract: A fruit sterilizing and cooling device using a plasma-activated ice-water mixture includes a top-opened tank body, where the tank body includes a front side provided with an ice-water tank, and a rear side provided with a cooling tank; a clapboard is provided between the ice-water tank and the cooling tank; a water passing port is formed in an upper portion of the clapboard; a grid plate is inserted at the water passing port; ice cubes are added to an upper portion of the ice-water tank; one side of a lower portion of the ice-water tank is connected to a plasma-activated water (PAW) generator; a valve is provided at a water outlet of the PAW generator; a fixed fence frame and a movable fence frame are provided in the cooling tank; and fruits to be treated are placed in the movable fence frame.

Abstract: Disclosed is a method for fast automatic calibration of a phased array based on a residual neural network. A phase setting matrix is set and an amplitude and a phase of a array far-field complex signal are measured with a network analyzer to obtain an amplitude and phase vector of the array far-field complex signal. A real part, an imaginary part, and a magnitude of the far-field measured complex signal value are separated and normalized, and mapped to RGB three-channel image data. Datasets are automatically generated according to a preset amplitude-phase error range by a simulation software, the datasets are proportionally divided into a training set and a test set to be input into the residual neural network for training to obtain a calibration model. Measured data is input into the calibration model for automatic estimation of the amplitude-phase error of the phased array.

Abstract: A method for place re-recognition of a mobile robot based on a lidar estimable pose, said method comprising: using radon transform to convert rotation and translation changes into translation changes on two axes of a sinusoidal graph, and, on the basis of an amplitude spectrum of a spectrum, performing spectrum cross-correlation calculation on translation invariance and two images, so as to solve the translation property of the images. Translation invariance is used to generate a position descriptor and thereby perform candidate matching for place re-recognition; and cross-correlation calculation may be performed together with radon transform to solve relative rotation and translation. In the described method, a time-varying environment is considered, and by using a multi-channel feature BEV for representation, the capability of representing a local feature in a laser point cloud can be improved.

Abstract: A method for preparing sodium taurine as a taurine intermediate is provided in the present disclosure. The method comprises the following steps: providing sodium hydroxyethyl sulfonate and an ammonia source; and placing the sodium hydroxyethyl sulfonate and the ammonia source in an aminolysis reactor for an aminolysis reaction to obtain a mixture containing sodium taurine as a taurine intermediate, wherein the molar ratio of ammonia in the ammonia source to the sodium hydroxyethyl sulfonate is greater than or equal to 25:1. A method for preparing taurine is further provided.

Abstract: A measurement method for the impedance of the converter at multiple operating points based on the secondary-side disturbance includes the following steps: superimposing the positive sequence current disturbance in the current sampling value; superimposing the positive sequence voltage disturbance in the voltage sampling value; determining whether measurement data of the converter at two or more current operating points are obtained, if so, based on the measurement data of the converter at two current operating points, calculating values of A(s) and B(s); further calculating values of coefficients at each frequency point, and obtaining the impedance value of the converter at multiple current operating points by calculation. The above-mentioned measurement method overcomes the disadvantages of high cost and complicated operation of the impedance measurement method based on the primary-side disturbance, and solves the problem of lacking the pre-judgment function.

Abstract: The present invention discloses a Paenibacillus strain capable of producing polysaccharides with an after-sun repair effect and use thereof. This strain is classified and named as Paenibacillus polymyxa PYQ1, preserved in China General Microbiological Culture Collection Center with a preservation number of CGMCC No. 16444. The present invention includes isolation and cultivation of strains and 16S rDNA identification; obtaining extracellular polysaccharides from fermentation product of the strain and use of the extracellular polysaccharides produced by the strains in repairing after-sun damages.

Abstract: The present application discloses a microbubble dispersion system stabilized with polydopamine nanoparticles for highly-efficient intravenous oxygen supply and a method for preparing the same. The method includes: dissolving dopamine, chitosan quaternary ammonium salt and amino-rich polymer in water, adjusting the pH to be alkaline, and then introducing oxygen into the solution; under the strong shear force of a homogenizer, oxygen oxidizing dopamine, and the obtained polydopamine nanoparticles adhering to the interface of oxygen microbubbles during polymerization, forming a compact shell layer of polydopamine particles; finally, adding glutaraldehyde to solidify the shell layer of polydopamine particles adhered to the interface of microbubbles, and obtaining oxygen microbubbles stably dispersed in water by filtration, washing and redispersion.