Abstract: A method for identification of characteristic components in a Kai-Xin-San by thin-layer chromatography (TLC) is provided, belonging to the technical field of pharmaceutical raw material detection and traditional Chinese medicine quality control. The method only needs to prepare two test solutions to simultaneously identify six characteristic components in the Kai-Xin-San, namely ginsenoside Rb1, ginsenoside Re, tenuifolin, ?-asarone, dehydrotumulosic acid, and pachymic acid. An automatic TLC spotting instrument can ensure even sampling and flat chromatographic bands and the silica gel G thin-layer plates after spotting are placed in the steam of the optimized developing solvent to allow pre-saturation.

Abstract: The present disclosure belongs to the technical field of OAM antennas, and provides a frequency re-configurable OAM antenna in S band and a frequency reconfiguration method. The OAM antenna includes a lower dielectric substrate and multiple array units. Each array unit includes a metal patch, an upper dielectric substrate, an outer loop, an inner loop, a coaxial feeder, four metal probes, and four diodes. In the present disclosure, bias states of all the diodes of each array unit are controlled by applying a voltage; when all the diodes are in forward bias states, the antenna works at a high frequency; and when all the diodes are in reverse bias states, the antenna works at a low frequency. The frequency re-configurable OAM antenna in S band in the present disclosure has features of frequency reconfiguration and two OAM radiation modes, and has a stable gain over a broadband.

Abstract: An economical optimization strategy construction method and system for lateral stability control of an electric vehicle, and a computer-readable storage medium are provided. The method includes: firstly constructing a lateral stability control system model with active allocation optimization to achieve the coordinational allocation between effective working areas of each part by means of a coordinational variable L; secondly, on the basis of the system model with active allocation optimization, designing a lateral stability controller under a model predictive control framework, where the designed objective function J makes the motion state of the vehicle track the expected value at steady state; and finally, considering the mapping relationship between the additional yaw moment and the coordinational variable L, constructing a three-dimensional surface, and analyzing the influence of the coordinational variable L, and determining the workflow of a regulator of the coordinational variable L.

Abstract: Wave-absorbing materials in the form of a nickel-carbon composite that includes a plurality of modified carbon particles, where each of the modified carbon particles includes a nickel nanoparticle core and a carbon layer wrapped on a surface of the nickel nanoparticle core; and a plurality of the modified carbon particles form an octahedral structure. When a high-frequency microwave interacts with the nickel-carbon composite, the composite has a stronger magnetic loss performance due to various magnetic loss characteristics such as natural resonance and eddy current loss of the magnetic nickel nanoparticles. In addition, the carbon layer, as a shell layer, can provide a directional electron migration path in a special octahedral space structure to construct a conductive network.

Abstract: Disclosed is an underwater robot for a mine flooding rescue, including a starting unit configured to control the implementation of a whole rescue action; a drive unit connected with the starting unit and configured to provide a robot with power to move; and an execution unit connected with the drive unit and configured to salvage underwater life sources.

Abstract: Provided is a zero-clearance fifth-generation (5G) ultra-wideband (UWB) Multiple-Input Multiple-Output (MIMO) antenna, including a main dielectric substrate, lateral dielectric substrates, and multiple antenna elements, where the lateral dielectric substrates are arranged at two sides of the main dielectric substrate; the multiple antenna elements are arranged on the lateral dielectric substrates; the antenna elements each include a feeding element and a grounding radiator element; the feeding element is provided at an inner side of each of the lateral dielectric substrates; and the grounding radiator element is provided at an outer side of the lateral dielectric substrate.

Abstract: A method for quantitatively detecting hydroquinone including: using a “NaClO2—C4H13NO—Na2S4O6” CAT clock reaction system as a detection solution, wherein C4H13NO is tetramethylammonium hydroxide; recording a graph showing that a pH value in the CAT clock reaction system changes with time; obtaining the fact that the CAT clock reaction systems show different induction times to added solutions of hydroquinone with different concentrations; establishing a working curve based on a relationship between the concentrations of hydroquinone in the CAT clock reaction system and the induction times, thereby achieving a quantitative detection of the hydroquinone in a test sample.

Abstract: A graphene quantum dots-gadolinium ion chelate (Gd@GQDs) nanomaterial with hydrophilic groups on the surface has a preparation method that includes: preparing graphene oxide by using a Hummers method; subsequently, subjecting the graphene oxide to heating, oxidation, and purification to obtain pure graphene quantum dots; and finally, chelating the graphene quantum dots with Gd3+ to form stable Gd@GQDs. The Gd@GQDs is easily dispersed in water, phosphate buffered solution (PBS), biological medium and other aqueous system, has good biocompatibility and low cytotoxicity, shows an excellent T1-weighted contrast performance in a 1.5-Tesla magnetic resonance testing system, and has a relaxation rate r1 as high as 72 mM?1s?1, the value of r1 being 20 times higher than that of the current commercial T1-weighted magnetic resonance imaging contrast agent Gd-DTPA.

Abstract: A preparation method of zaleplon is provided and belongs to the technical field of pharmaceutical chemistry. The preparation method adopts simple and cheap m-nitrobenzaldehyde and triethylamine as raw materials, and constructs a core structure of zaleplon with high efficiency and high selectivity through a one-pot series reaction without transition metal catalysis, thereby avoiding the formation of isomers, reducing the generation of by-products, increasing the yield of target products and reducing the synthesis cost; and after simple nitro reduction modification, zaleplon is prepared. The method has the advantages of short preparation route, mild reaction conditions and simple operation, so the method is suitable for industrial production.

Abstract: The metal ceramic powder with a particle size of 15-45 ?m and suitable for thermal spraying is prepared through a combination of mechanical ball milling, spray granulation, and vacuum sintering. The metal ceramic powder is sprayed on a surface of a steel substrate adopting the high velocity oxygen fuel (HVOF) technology with oxygen-propane as fuel and taking oxygen as a combustion improver, propane as fuel, nitrogen as powder feeding carrier gas, and air as a cooling medium to prepare and form the NiCrBSi—ZrB2 composite coating. The present disclosure solves the problem that ZrB2 ceramic is difficult to compact during sintering and improves powder bonding strength and fluidity. The preparation method is simple, has advantages of high coating deposition efficiency and convenient equipment operation, and is cost-effective. The preparation method can improve thermal corrosion resistance and high-temperature wear resistance of a surface of boiler, and prolonging lifetime of the boiler.

Abstract: The present disclosure provides a synthetic aperture radar (SAR) image target detection method. The present disclosure takes the anchor-free target detection algorithm YOLOX as the basic framework, reconstructs the backbone feature extraction network from the lightweight perspective, and replaces the depthwise separable convolution in MobilenetV2 with one ordinary convolution and one depthwise separable convolution. The number of channels in the feature map is reduced by half through the ordinary convolution, features input from the ordinary convolution are further extracted by the depthwise separable convolution, and the convolutional results from the two convolutions are spliced. The present disclosure highlights the unique strong scattering characteristic of the SAR target through the attention enhancement pyramid attention network (CSEMPAN) by integrating channels and spatial attention mechanisms.

Abstract: Disclosed is a synchronous detection system for a trace nitrogen-oxygen compound based on photoacoustic spectrometry, including a NOx (Nitrogen Oxide) detection air channel, a dust detection air channel and a double-photoacoustic spectrometry detection mechanism which are mutually connected in parallel; the NOx detection air channel includes a background interference detection air pipe, a NO2 detection air pipe and a NO detection air pipe that are mutually connected in parallel, and a NOx photoacoustic detection cavity; and the dust detection air channel includes a dust detection air pipe and a dust photoacoustic detection cavity communicating with the dust detection air pipe.

Abstract: The present disclosure relates to a domain decomposition method and system for electromagnetic simulation. The method includes: dividing an antenna structure model into multiple subdomains, where each of the subdomains corresponds to a structure in one to-be-simulated array antenna; subdividing each of the subdomains by a tetrahedral network to obtain multiple tetrahedrons; obtaining a vector basis function of each edge of each of the tetrahedrons according to vertex positions and lengths of the edges of the tetrahedron; and calculating an electric field value and a magnetic field value of any point in a tetrahedron to which each of the edges belongs using a vector basis function corresponding to the edge and a double curl electric field wave equation of a subdomain to which the edge belongs.

Abstract: The present application relates to an attitude self-correcting underground transportation apparatus based on UWB technology and a control method thereof. A transport clamping and fastening mechanism is mounted on an upper platform part of a six-degree-of-freedom motion platform. An attitude perception and sensing set at least includes three UWB tags being configured to acquire position information.

Abstract: An ultra-wideband electromagnetic band gap (EBG) structure includes multiple EBG units in an array. Each EBG unit includes a power plane, a dielectric substrate and a ground plane from top to bottom. The power plane includes a patch, a coupled complementary split ring resonator (C-CSRR) and a plurality of semi-improved Z-bridge structures. Each edge of the patch is provided with a semi-improved Z-bridge structure. The C-CSRR is provided within a ring formed by the semi-improved Z-bridge structures. The Z-bridge structure includes a first horizontal branch, a first vertical branch, a second horizontal branch and a second vertical branch connected in sequence. The second vertical branch is connected to the patch. First horizontal branches of adjacent EBG units are connected to each other. A circuit board including the aforementioned EBG structure is also provided.

Abstract: The present disclosure provides a method for fine-grained detection of driver distraction based on unsupervised learning, belonging to the field of driving behavior analysis. The method includes: acquiring distracted driving image data; and inputting the acquired distracted driving image data into an unsupervised learning detection model, analyzing the distracted driving image data by using the unsupervised learning detection model, and determining a driver distraction state according to an analysis result. The unsupervised learning detection model includes a backbone network, projection heads, and a loss function; the backbone network is a RepMLP network structure incorporating a multilayer perceptron (MLP); the projection heads are each an MLP incorporating a residual structure; and the loss function is a loss function based on contrastive learning and a stop-gradient strategy.

Abstract: A capacitive flexible tactile sensor based on graded inclined micro-cylindrical structure, includes an upper electrode layer, a lower electrode layer and a dielectric layer between them. The dielectric layer is composed of an upper dielectric layer and a lower dielectric layer. The upper dielectric layer includes an upper dielectric layer base, upper dielectric layer long micro-cylinders and upper dielectric layer short micro-cylinders. The lower dielectric layer includes lower dielectric layer base, lower dielectric layer long micro-cylinder and lower dielectric layer short micro-cylinder. The upper dielectric layer long micro-cylinders and the lower dielectric layer long micro-cylinders are closely bonded, and there is a distance between the upper dielectric layer short micro-cylinder and the lower dielectric layer short micro-cylinder. The sensor structure of the present application is stable, overcomes the viscous effect.

Abstract: Bidirectional circularly polarized antenna element and bidirectional circularly polarized array antenna are provided, and comprising a dielectric substrate, a feeder, a radiation patch, a first plane, a second plane, a first coupling assembly and a second coupling assembly which are embedded in the surface of the dielectric substrate. The first plane and the second plane of the antenna element are kept at different heights, and compared with the solution that two planes at the same height can only generate linear polarization radiation in the prior art, the circular polarization radiation can be generated, which solves the problem of linear polarization mismatch. Furthermore, two coupling assemblies are introduced into two sides of the radiation patch to enable the coupling effect with the radiation patch, such that the frequency bandwidth of the circularly polarized antenna can be greatly improved without increasing the size of the antenna.

Abstract: An improved low-toxicity and high-efficiency orthoester mixture pharmaceutical adjuvant, a preparation method thereof, and a topical sustained release drug delivery formulation including the same are provided.

Abstract: The present disclosure provides a transformer-based driver distraction detection method and apparatus, belonging to the field of driving behavior analysis. The method includes: acquiring districted driving image data; building a driver distraction detection model FPT; inputting the acquired distracted driving image data into the driver distraction detection model FPT, analyzing the distracted driving image data by using the driver distraction detection model FPT, and determining a driver distraction state according to an analysis result. The present disclosure proposes a new network model, i.e., a driver distraction detection model FPT, based on Swin, Twins, and other models. Compared with a deep learning model, the FPT model compensates for the drawback that the deep learning model can only extract local features; the FPT model improves the classification accuracy and reduces the parameter quantity and calculation amount compared with the transformer model.