4results about How to "Excellent extractability" patented technology

The invention discloses a generative model redrawing attack-oriented image robust watermark traceability method and system and a computer readable storage medium, and belongs to the field of digital information security and artificial intelligence content governance. The method comprises the following steps: in a watermark embedding stage, performing error correction coding and digital signature processing on traceability information containing identity information and a timestamp to generate a load to be embedded, and embedding the load to be embedded and a synchronization template for geometric synchronization into a host image in a function separation manner by using a deep neural network; in the training stage, combined optimization is carried out on the watermark embedding and extracting process by introducing generative model redrawing and microsimulation of image distortion attack, so that the robustness of the watermark under a complex attack condition is improved; in the extraction and verification stage, under the condition that an original image is not needed, geometric synchronous correction and blind extraction of a watermark load are carried out on an image to be analyzed, and authenticity confirmation of traceability information is completed through error correction decoding and digital signature verification. By adopting the technical scheme of the invention, the problems of insufficient traceability information robustness, difficult source confirmation and incomplete evidence chain in a generative model redrawing scene in the prior art are solved, and verifiable traceability and credible evidence generation of the image source information are realized.

The application provides a palladium ion extractant material and a preparation method thereof, and the pyridine-oxadiazole ligand is used as the extractant, most Pd 2+ in the aqueous phase can be extracted into the organic phase in a short time, and has a very high extraction rate; selective extraction separation of Pd 2+ under acidic conditions can be realized, the applicable range of acidity is wide, and excellent extraction capacity is achieved in the range of 0.2-4M nitric acid concentration; the extractant has excellent selectivity to Pd 2+ in the aqueous phase containing various metal ions; the pyridine-oxadiazole extractant has a good application prospect in the separation and recovery of Pd 2+ in high-level radioactive waste; the m-nitro-trifluorotoluene is used as a diluent of the extraction system, has good solubility to the organic ligand and the extractant, and the 2-bromohexanoic acid can increase the lipophilicity of the extractant.

The invention discloses a plane target adapting to a mobile scanning environment and a bull's-eye positioning method and system. Relates to the field of three-dimensional laser scanning and the technical field of engineering measurement. The method comprises the following steps: acquiring point cloud data of a complete front pattern of each planar target and preprocessing the point cloud data to obtain a target point cloud data set; processing the target point cloud data set to obtain a centralized point cloud, and performing singular value decomposition on the centralized point cloud; constructing a point cloud data plane according to the decomposition result of the singular value, calculating the distance from the point cloud data to the point cloud data plane, and determining an optimal plane; a cross wire of each plane target is decomposed, original data of straight lines are extracted and optimized, the optimized original data are fitted, and two straight lines are obtained; and projecting the two straight lines to an optimal plane to calculate an intersection point, thereby completing target center identification. The method can effectively remove the influence of noise and outliers, enables the data to be more concentrated and accurate, and remarkably improves the precision and reliability of subsequent calculation.

This invention relates to the field of sample pretreatment technology, and in particular to a rapid extraction method for pesticides in water based on a confined liquid membrane. The method includes the following steps: preparing a composite substrate membrane comprising carbon nanofibers / carbon fibers and carbon nanofibers / carbon spheres; injecting ethanol as a confining solvent through the composite substrate membrane until droplets form beneath the membrane, thus completing the construction of the confined liquid membrane; passing a water sample containing the target pesticide through the confined liquid membrane at a set flow rate; using a desorption solvent at a set flow rate through the confined liquid membrane to elute the extracted target pesticide; collecting the eluent and performing quantitative analysis. This invention, through its ingenious confined liquid membrane design, successfully achieves rapid simultaneous extraction of pesticides with a wide polarity range and multiple categories from water while ensuring high extraction efficiency and good reproducibility.