27 results about "Complex matrix" patented technology

This invention discloses a pretreatment method for detecting trace perfluorinated and polyfluoroalkyl substances (PFAS) in complex matrix textiles, belonging to the field of materials analysis technology. The method involves placing the textile in an alkaline solvent containing an alkyl sulfonate displacing agent. Under heating conditions, the displacing agent utilizes its competitive adsorption mechanism to forcibly occupy matrix adsorption sites and displace the target analytes into the solvent. Subsequently, the temperature is rapidly lowered to the phase separation induction temperature, inducing supersaturation precipitation of the displacing agent, which then encapsulates impurities in situ and co-precipitates, forming a solid-liquid stratified system. Finally, the supernatant is collected for analysis. This invention utilizes the dual properties of the displacing agent—high-temperature solubilization and low-temperature phase change removal—to effectively break the strong adsorption equilibrium of aged textiles without using a solid-phase extraction column. This solves the contradiction between low extraction rate and significant matrix interference, significantly improving the recovery rate of PFAS. It offers advantages such as low cost, simple operation, and high accuracy.

The application relates to the technical field of automatic charging, and provides a control method and system of an automatic charging device, a mechanical arm of the automatic charging device comprising three rotary joints, one translation joint and joint arms between the joints, the rotary planes of the three rotary joints being parallel to each other, the translation joint driving a charging gun to move along a translation axis, the method comprising the following steps: acquiring current pose parameters of the mechanical arm and a target pose of the charging gun; calculating a current pose of the charging gun based on the current pose parameters; and planning a joint path of the mechanical arm based on a two-dimensional search method and the geometric relationship between the rotation angle of the charging gun relative to the translation axis and the joint angles of the rotary joints according to the current pose and the target pose. The application does not need to establish a D-H kinematics model and does not need to perform complex matrix operations; moreover, the two-dimensional search method can directly obtain an optimal solution without iterative calculation, reduces the calculation time cost, and has high overall planning efficiency.

This invention discloses a magnetic covalent organic framework composite material modified with nucleic acid aptamers, its preparation method, and its applications. The composite material uses magnetic iron oxide microspheres as the core, with the surface of the core coated with a shell of covalent organic framework material. Nucleic acid aptamers capable of specifically recognizing tetracycline antibiotics are stably assembled onto the shell surface through non-covalent interactions. This invention fully utilizes the large specific surface area and electron-rich framework of magnetic covalent organic framework materials as efficient carriers for nucleic acid aptamers, effectively overcoming the shortcomings of traditional adsorption materials in terms of poor selectivity and limited adsorption capacity in complex matrices, while avoiding cumbersome covalent modification processes. This composite material exhibits excellent adsorption capacity and superior selectivity for tetracycline antibiotics, and is particularly suitable for rapid and efficient magnetic solid-phase extraction of trace tetracycline antibiotics in complex animal-derived food matrices, significantly improving the detection sensitivity and accuracy of subsequent instrumental analysis.

The application discloses a method for analyzing methyl mercury methyl carbon in a complex matrix, which comprises the following steps: taking a methyl mercury-containing sample to be measured, adding sodium tetraphenylborate to perform a phenyl derivatization reaction; performing headspace solid-phase microextraction enrichment on the derivatized sample; introducing the enriched solid-phase microextraction fiber into a gas chromatograph mass spectrometer to perform thermal desorption, separation and detection; and qualitatively or quantitatively analyzing the methyl mercury methyl carbon according to the retention time, mass spectrum response signal and isotope characteristics. The application is aimed at the problems of low methyl mercury content and strong matrix interference in a complex matrix such as a microbial culture system, and combines phenyl derivatization, solid-phase microextraction enrichment and gas chromatograph mass spectrometry detection, so that the enrichment efficiency and detection sensitivity are improved, the matrix interference is reduced, the method has the characteristics of high sensitivity, good matrix adaptability and stable repeatability, and is suitable for trace methyl mercury methyl carbon analysis in a complex culture matrix and isotope characteristic determination of a 13C labeled system.

This invention belongs to the technical field of battery material analysis, and discloses a sample digestion method for determining the titanium content in carbon-coated lithium iron phosphate and a method for determining the titanium content therein. The sample digestion method provided by this invention uses concentrated sulfuric acid, perchloric acid, and ammonium sulfate as the first digestion reagents. The carbon-degradation-oxidation-decomposition of carbon-coated lithium iron phosphate is achieved at a high temperature of 200℃~350℃. Concentrated hydrochloric acid is used as the second digestion reagent to achieve complexation-stabilization of titanium ions, thereby achieving complete digestion of carbon-coated lithium iron phosphate. This yields a clear, transparent digestion solution with stable titanium ions, which can be directly used for quantitative analysis of titanium. This method has the advantages of simple operation, short processing time, and high processing efficiency, and has excellent application prospects for accurate and industrialized batch detection of titanium content in this complex matrix battery material, carbon-coated lithium iron phosphate.

The application discloses a kind of MSNs@Au-LAC@PDA-PPy composite material and its preparation method and application.It is mainly prepared by MSNs@Au, lacase LAC, polydopamine PDA and polypyrrole PPy composite;Preparation is dissolved in acetic acid-sodium acetate buffer lacase to prepare lacase solution, MSNs@Au is added into lacase solution and is ultrasonic, stirring, soaking and acetic acid-sodium acetate buffer is washed by centrifugation, then hydrochloric acid dopamine, pyrrole and Tris solution, initiator are added, stirring is used at specific temperature Distilled water is washed by centrifugation, finally freeze-drying treatment obtains final MSNs@Au-LAC@PDA-PPy composite material, and further preparation electrode is used for bisphenol A detection.The application prepares high-sensitivity electrochemical sensor, is used for the high-sensitivity detection of BPA in complex matrix, can realize the efficient fixation and protection of lacase.

This invention relates to the field of environmental analysis and testing technology. Addressing the problems of limited specific surface area, uneven mass transfer during stirring, and low desorption efficiency in existing membrane or tubular enrichers, it provides a rapid enricher using a stirred silicone rubber filament bundle. This enricher consists of 2-300 silicone rubber filaments bound into a bundle by a fixed head, connected to an electric drill via a connecting rod, and can be rotated and stirred in water samples at 100-3000 rpm. After enrichment, the bundle is placed in a thermal desorption container, where organic matter is desorbed by heating and then detected by ion mobility spectrometry along with the carrier gas. Compared to membrane / tubular structures, the filament bundle has a larger specific surface area, stronger turbulence during stirring, and effectively improved enrichment efficiency. Furthermore, the filament bundle is flexible and not easily broken, making it suitable for rapid on-site detection of complex matrix water and air samples.

This application relates to the field of quantum computing technology, and in particular to a method, apparatus, and electronic device for compressed storage of quantum logic gates, comprising: creating a decision graph and using the root node of the decision graph as the current node; dividing the matrix into four sub-matrices with the same number of rows and columns, creating a child node corresponding to each sub-matrix, and associating the pointer of the current node with each child node; when a sub-matrix satisfies a preset termination condition, using the child node corresponding to the sub-matrix as a leaf node and storing the leaf node as a scalar value of the corresponding sub-matrix; recursively decomposing the quantum gate matrix and shared sub-matrices by creating a decision tree, decomposing complex matrix operations into smaller sub-problems, reducing redundant computations; and using the decision graph to explore the sparsity and regularity of the quantum gate matrix, efficiently representing the quantum gate matrix and state vector, thereby achieving compressed storage of matrices in quantum circuits and avoiding redundant computations.

This invention discloses a method and application for detecting diazepam based on ratio Raman signals, belonging to the field of food safety and chemical detection technology. The method involves mixing an Au@4-NTP@Ag@ZIF-8 composite material solution with the sample solution to be tested, then dropping the mixture onto a substrate. A Raman spectrometer is used to acquire spectral data at an excitation wavelength of 532 nm, and the intensity ratio I is calculated. 1590 / I 1107 Substitute diazepam concentration to intensity ratio I 1590 / I 1107 The concentration of diazepam in the sample was calculated using a standard curve. The detection method of this invention exhibits high selectivity for diazepam and is unaffected by interference from macromolecules such as proteins, lipids, and glucose, as well as small molecule chemicals in complex matrices. It enables trace, rapid, and accurate detection of diazepam residues in aquatic products, and has significant application prospects in practical scenarios such as port clearance and on-site law enforcement.

The application specifically relates to a method for analyzing the content of impurity elements in a neodymium iron boron material by a fusion sample preparation-X-ray fluorescence spectrometry, and belongs to the technical field of analytical chemistry and material detection. The method comprises the following steps: after grinding, a sample is pre-fused in a platinum-gold crucible by using anhydrous lithium tetraborate to form a protective layer; lithium carbonate is added as an oxidant and vanadium pentoxide is added as an internal standard, and after pre-oxidation in stages, the sample is high-temperature fused to prepare a glass sheet; under optimized instrument conditions, a working curve is established by using a series of standard fusion sheets, a to-be-measured fusion sheet is measured, and the content of each element is calculated. Through the synergistic technology of the "flux protective layer-dry pre-oxidation-internal standard correction", two major problems of corrosion of active metals on the crucible and correction of the complex matrix effect are solved, and 10 kinds of elements such as Al, Cu, Co, Ga, Dy and Tb can be simultaneously and accurately measured. The method is safe in operation, high in efficiency and good in reproducibility, and is suitable for quality control and composition analysis of a neodymium iron boron permanent magnet material.

The application specifically relates to a microplastic real-time identification method based on single-particle acoustic streaming behavior spectrum and application, and solves the technical problem that the characteristic dynamic behavior of particles in an acoustic field is not used for directly identifying and classifying the characteristics of particles in the prior art. By applying a programmable, multi-mode switching acoustic field, a single microplastic particle is excited to generate a characteristic dynamic behavior uniquely related to its size, shape, density and elastic modulus, and a high-speed sensor is used to collect a scattering light timing signal, and then a multi-dimensional behavior feature vector is extracted, and a microplastic is realized in real time by combining an artificial intelligence model. Label-free, high-throughput detection and classification. The application principle is innovative, and completely gets rid of the dependence on optical imaging, is especially suitable for and good at detecting transparent / semi-transparent microplastics, has strong anti-complex matrix interference capability, and provides a brand-new solution for on-site rapid screening of microplastics in environmental water bodies.

The application relates to the field of material analysis, and discloses a test method for analyzing the properties of lotus plumule extract, which comprises the following steps: introducing the lotus plumule extract to be detected into a flow detection pool to establish a transient electrically induced birefringence monitoring field; applying a high-frequency bipolar symmetric square wave electric field to an excitation electrode pair; using the polarity high-frequency switching characteristic to limit the displacement of free ions within a local perturbation range, and simultaneously inducing the electric dipole orientation arrangement of alkaloid molecules; removing the electric field; monitoring and recording the transient birefringence decay trajectory data; and processing the data to separate the spin relaxation time constants belonging to different components, and determining the contents of nuciferine, isonor-lausplumuline and methylnuciferine according to the mapping rule between the constants and the effective hydrodynamic radius of molecules. The application realizes the physical decoupling of overlapping signals in the time domain through the spin relaxation characteristic, effectively suppresses the ionization interference of a complex matrix, and ensures the stability of a detection baseline.

The invention proposes a method, using a transmitter device (2), for precoding v sequence(s) of symbol(s) spatially distributed over v layers of Mlayer symbols using a plurality of complex precoding matrices of dimensions Pxv, where P denotes a number of antenna ports of the transmitter device, each precoding matrix being constructed from a complex matrix W of dimensions Pxv, said precoding method being characterised in that, for v> 1 and P> min(1,v), the v columns of the complex matrix W are linear combinations of distinct vectors from a basis of P orthogonal vectors wp, p=0,..,P-1.

This application discloses a high-throughput automated nucleic acid extraction kit for complex matrix samples, comprising a reaction plate. The reaction plate is pre-encapsulated with at least one set of encapsulation reaction solutions. Each set of encapsulation reaction solutions includes a binding solution, a first washing solution, a second washing solution, a magnetic bead solution, and an elution solution. Each set of encapsulation reaction solutions occupies six wells on the reaction plate, and the first washing solution occupies two wells. This application provides a high-throughput automated nucleic acid extraction method for complex matrix samples, using the aforementioned nucleic acid extraction kit. This application employs a reaction plate with specific pre-encapsulated reaction solutions, combined with sample pretreatment reaction solutions and pretreatment steps, to meet metagenomic sequencing requirements. It can obtain high-quality nucleic acids from fecal samples and can be used with conventional automated equipment to achieve a high-purity, low-cost, and efficient closed-loop processing flow. The optimal process and parameters for instrument and reagent combination ensure high-quality detection and possess industrialization capabilities.

This invention proposes a graphyne / gold nanocomposite material, its preparation method, and its application. The graphyne / gold nanocomposite material comprises graphyne and gold nanoparticles loaded on its surface. Graphyne can enrich the gold nanoparticles, and the gold nanoparticles loaded on the graphyne can generate a localized surface plasmon resonance effect, thereby providing a SERS signal response. The substrate of this invention exhibits good SERS signal response to dyes and plant toxins, and the substrate enhancement effect is stable and highly reproducible, ensuring the accuracy and reliability of the detection results. This invention also proposes the application of the above-mentioned graphyne / gold nanocomposite material as a surface-enhanced Raman scattering substrate for detecting isoxazole / tryptamine toxins in mushrooms. This enables rapid detection of psilocybin and amatoxins in complex matrices of fungal samples; it can be used for rapid screening of highly poisonous mushrooms and their products in food safety, showing significant application prospects.

This invention discloses a method for preparing a magnetic molecularly imprinted fluorescent sensor and its application. The method involves imprinting a magnetic molecularly imprinted fluorescent sensor onto the surface of silicon-functionalized iron(III) oxide nanoparticles using a sol-gel method. Eugenol is used as a template molecule, and silanized carbon quantum dots are embedded within the nanoparticles. After eluting the eugenol, imprinted cavities with specific recognition sites for eugenol are obtained. This invention uses silicon-functionalized iron(III) oxide nanoparticles as the matrix, enabling the sensor to be rapidly separated and recovered from the solution under an applied magnetic field, thus improving detection efficiency. Furthermore, the sol-gel method produces a relatively thin imprinted layer with high mass transfer efficiency. The sensor obtained by this invention exhibits good selectivity, stability, anti-interference properties, and reusability, and has significant application value for the detection and control of eugenol in various complex matrices.

The application discloses a target azimuth measurement method and device and a storage medium, and is used for a MIMO radar. The method comprises the following steps: driving a transmitting antenna to transmit two radio frequency signals with different center frequencies and receiving a return signal; obtaining a first complex vector according to a complex matrix corresponding to the return signal; calculating a second-order cumulative quantity matrix according to the first complex vector, and obtaining an array element distance matrix according to the position of a receiving array element; converting the array element distance matrix into an array element index vector, and vectorizing the second-order cumulative quantity matrix to obtain a second complex vector; and determining the azimuth of a target to be measured based on the array element index vector and the second complex vector. The technical scheme provided by the application can solve the technical problem in the prior art that the scattering intensity of a detection point on a target to be measured randomly changes when a millimeter wave radar measures the azimuth of the target, the target return phase wave is distorted, the angle glint phenomenon is caused, and the angle measurement error is caused.

Precoding and reception methods, transmitter device and receiver device. The invention proposes a method for precoding, by a transmitter device (2), sequence(s) of symbol(s) spatially distributed on layers of Mlayer symbols using a plurality of complex precoding matrices of dimensions Px, where P denotes a number of antenna ports of the transmitter device, each precoding matrix being constructed from a combination of a complex matrix W of dimensions Px, a complex diagonal matrix D of dimensions x introducing a variety of cyclic delays and a complex rotation matrix U of dimensions x, said precoding method being characterized in that, for >1 and P>min(1,), the P columns of the complex matrix W are linear combinations of distinct vectors from a basis of P orthogonal vectors, p=0,..,P-1. Figure for the abstract: Fig. 1.

The present application belongs to the technical field of radio wave propagation, and discloses a three-dimensional parabolic equation prediction method for the propagation characteristics of low-frequency ground wave on fluctuating terrain. Firstly, the 3D-CMM-PE form on the condition of irregular terrain is derived, and then the explicit difference format of 3D-CMM-PE is proposed. On this basis, combined with the single-side approximation and the explicit difference scheme, the 3D impedance boundary condition is effectively merged into the explicit finite difference algorithm. Then, the field distribution in the calculation area is solved point by point, and based on the full-field calculation result, the magnetic field intensity and the secondary time delay of the radio wave propagation are further solved. The significant advantage of the method is that by introducing the explicit finite difference algorithm and combining the 3D impedance boundary processing, the complex matrix inversion process in the traditional implicit algorithm is avoided, the calculation complexity and memory requirement are greatly reduced, and the overall calculation efficiency is improved, thereby providing effective technical support for the engineering prediction and practical application of the low-frequency ground wave propagation characteristics.

The application relates to the technical field of steel processing, and discloses a method for detecting the boron content in steel, which comprises the following steps: S1, dissolving a steel sample by using a dissolving agent to obtain a to-be-detected solution; S2, preparing a standard series solution, measuring the first analysis line intensity of boron elements in the standard series solution to establish a correction curve; S3, measuring the second analysis line intensity of boron elements in the to-be-detected solution, and obtaining the instrument measurement value of the boron elements based on the correction curve and the second analysis line intensity; and S4, measuring the content of interfering elements in the to-be-detected solution, and correcting and calculating the instrument measurement value of the boron elements based on the content of the interfering elements and the standard series solution to obtain the boron element content in the steel sample. Through the scheme, the spectral overlapping interference of coexisting elements such as tungsten, molybdenum and cobalt in the steel can be effectively eliminated, and the precision and reliability of the boron content determination in a complex matrix sample are improved.

This invention provides a method for determining the mass and purity of silver in ceramic cups with a silver layer on the inner wall, belonging to the field of precious metal analysis and detection technology. Addressing the technical problems of existing physical methods being unable to remove the silver layer and chemical methods being affected by bismuth interference from the ceramic matrix in purity determination, this invention uses silver-free ceramic cups from the same batch as a specific blank control. The silver-layered sample and the blank sample are simultaneously digested using an optimized ratio of nitric acid solution under specific temperature and time conditions. The mass of silver is accurately determined by ammonium thiocyanate titration, and the impurity concentrations in the sample and blank solutions are determined separately by spectroscopic methods. Background interference such as bismuth dissolved from the ceramic is accurately subtracted using a difference method, and the silver purity is finally calculated through normalization. This method enables continuous and accurate determination of silver mass and purity with a single sample dissolution, effectively solving the problem of interference from complex matrices, significantly improving the precision and accuracy of detection, and providing a feasible technical solution for the quality inspection of silver-layered ceramic products.

The application discloses a method for determining silicon element in glass by ICP-MS CRC technology, which comprises four steps of sample pretreatment, instrument condition optimization, interference elimination verification and quantitative analysis: the glass sample is treated by a microwave digestion method or a melting method to avoid the introduction of interference by a chlorine-containing reagent; ICP-MS CRC reaction cell conditions are optimized, O2 or H2 is selected as a reaction gas, the flow rate is set to 0.3-0.7 ml / min, the cell pressure is set to 1.0-1.5 mbar, and 29Si+ is selected as a monitoring ion; the interference elimination effect is verified by a full scanning mode and a standard solution; and a standard curve is drawn and the silicon concentration is calculated. By using the method, the interference of polyatomic ions is effectively eliminated, the silicon detection limit is as low as 0.1 ppb, the detection accuracy is improved by more than 90%, and the method has the advantages of wide applicability, simple operation and reliable data, and can be used for accurate detection of trace silicon in glass and semiconductor material complex matrix samples.

This application discloses a method, apparatus, equipment, and medium for calculating the dynamic response and sensitivity of a nonlinear rotor system. The method includes the following steps: S1, based on the structural characteristics of the nonlinear rotor system, performing dynamic modeling of the nonlinear rotor system and establishing the equations of motion for the nonlinear rotor system; S2, establishing the hypercomplex form of the equations of motion for the nonlinear rotor system to obtain the hypercomplex equations of motion for the nonlinear rotor system, using complex matrix expression, and expanding the dimension of the complex matrix equations of motion for the nonlinear rotor system to convert them into equivalent real matrix equations; S3, solving the established hypercomplex equations of motion for the nonlinear rotor system, extracting the real and imaginary parts of the calculation results, and obtaining the system response and corresponding sensitivities of each order. This application achieves automatic updating and solving of the Jacobian matrix during the iteration process, ensuring the accuracy of the calculation results, and can simultaneously calculate the response and dynamic response sensitivity of the nonlinear rotor system, resulting in high computational efficiency.

This invention belongs to the field of drug detection technology, and discloses a flexible SERS substrate, its preparation method, and its application. The preparation method includes: Step S1, preparing PVP-coated AgNPs based on Citrate-Ag colloid; Step S2, using PDMS as a flexible substrate, transferring the AgNPs sol to the PDMS surface to form a PDMS@Citrate-Ag flexible SERS substrate. The flexible SERS substrate is the substrate obtained by the above method. It also includes a method for detecting narcotic and psychotropic drugs based on the flexible SERS substrate, comprising the following steps: Step S1, contacting the narcotic and psychotropic drug to be tested with the flexible SERS substrate and performing SERS measurement using a Raman spectrometer; Step S2, introducing a dSERS strategy to perform digital quantitative analysis of the target narcotic and psychotropic drug. The flexible substrate of this invention can meet the needs of rapid on-site detection of narcotic and psychotropic drugs in various scenarios, and the dSERS strategy can solve the problem of false negatives caused by low content, cumulative abuse, and interference from complex matrices. The combination of the two is beneficial to promoting the scientific rigor and reliability of drug detection in drug control work.

This invention discloses a method for flattening curved surfaces in laser shock forming, relating to the field of laser shock forming. The method includes: reading the three-dimensional mesh data corresponding to the curved surface part to be flattened and calculating the three-dimensional normal vectors of each vertex; establishing a two-dimensional projection plane; determining the pole from all vertices as the origin of the two-dimensional projection plane; projecting all vertices onto the two-dimensional projection plane, calculating and adjusting the initial coordinates of each projection point, determining the final two-dimensional projection coordinates corresponding to each three-dimensional mesh vertex, and then combining the surface topology of the original mesh to output the final two-dimensional flattened blank contour. This invention can automatically select the flattening direction, eliminate the need to solve complex matrix equations, maintain mesh topological continuity without tearing, and highly restore the original shape and boundary features of the three-dimensional curved surface, balancing dimensional accuracy and flattening efficiency.