8 results about "Topological transformation" patented technology

The invention provides a building construction site safety monitoring and early warning method and system based on the Internet of Things, and relates to the technical field of data processing.The method comprises the steps that a three-base-point dynamic topological structure is established in a target monitoring domain, a first datum point is arranged at the extension end of the axis vertical line of a slewing bearing of a tower crane, and a second datum point is arranged at the extension end of the axis vertical line of the slewing bearing of the tower crane; the second datum point is embedded in the radial section of a force bearing flange plate of the hydraulic jacking module, the third datum point is fixedly connected to the intersection joint of a deep foundation pit top beam and a supporting system, and a non-collinear vector set is constructed through three-point coordinate offset; and based on the non-collinear vector group, deformation compensation correction is performed on the dynamic calibration parameter set through a vector space topological transformation algorithm, a topological reconstruction data stream containing a displacement gradient tensor and strain energy density is generated, and a risk situation feature space is constructed based on the topological reconstruction data stream. According to the invention, the intelligent construction safety management is realized.

The invention discloses a catalyst for preparing methanol through high-temperature CO2 hydrogenation as well as a preparation method and application of the catalyst. The active component of the catalyst is a Mn-doped ZnZrO2 solid solution, and the catalyst is prepared by adopting a crystal growth regulation and control-in-situ topological conversion method: by taking an amphiphilic block copolymer or CTAB (Cetyltrimethyl Ammonium Bromide) as a template, inducing directional crystallization of a precursor through solvothermal to construct a hierarchical porous structure; topological transformation is realized through staged heat treatment, so that the Mn element is uniformly doped in the crystal lattice of the catalyst in an atomic scale; the surface of the catalyst is reconstructed through oxidation and reduction treatment, and the oxygen vacancy density and the acid-base property distribution are accurately regulated and controlled. Experimental results show that the CO2 conversion rate of the catalyst is gt at the high temperature of 280-350 DEG C; the methanol selectivity is gt; the space-time yield reaches more than 700 mg / (gcat.h <-1 >), and the performance is reduced by 1t after 200 hours of operation; 3%. The key problems that the catalyst is easy to sinter at high temperature, the active site distribution is uneven, the methanol selectivity is low and the like are effectively solved, and a high-performance and stable catalyst system is provided for efficient resource utilization of CO2.

The invention provides an atomic-scale dispersion transition metal M-based catalyst as well as a preparation method and application thereof, and belongs to the field of chemical engineering. According to the invention, LDHs is used as an innovative platform, and rich oxygen vacancies which are uniformly distributed are formed through topological transformation in a high-temperature reducing atmosphere, so that M nano-particles formed in a sol fixing process can be promoted to be re-dispersed and anchored in situ, thereby obtaining the M1-YOx-MgAlO catalyst. The active metal M of the catalyst is dispersed in an atomic scale and is anchored by an oxygen vacancy adjacent to an unsaturated coordination Y atom, so that electron interaction between M and Y is initiated, and an electron-deficient and stable M1 delta < + >-YOx synergistic active center is formed. The prepared atomic-scale dispersion transition metal M-based catalyst can be used in a selective hydrogenation reaction, shows excellent hydrogenation activity and selectivity, has outstanding catalytic performance, is easy to recover and reuse, and has good stability.

The application provides a method for topological transformation synthesis of high-entropy hydroxyl oxide nanosheets, and belongs to the technical field of inorganic materials, and comprises the following steps: 1) component design: Ca2Fe2O5 brown iron ore type oxide is used as a matrix material for element doping; 2) combustion synthesis of a precursor: a low-temperature solution combustion synthesis method is used to in-situ composite the raw material of step 1), and brown iron ore type oxide powder rich in ordered oxygen vacancies is prepared by burning the obtained powder; 3) structure reconstruction: the brown iron ore type oxide powder rich in ordered oxygen vacancies obtained in step 2) is subjected to high-energy ultrasonic activation to form a high-activity ultrathin structure nanosheet, and then an ion exchange reaction is carried out to obtain the high-entropy hydroxyl oxide nanosheet electrocatalyst. Compared with traditional NiFe and CoFe hydroxide / hydroxyl oxide, the nanosheet catalyst also shows higher anti-Fe leaching capacity in the OER process. The assembled zinc-air battery can stably operate for more than 225 hours at a low charging voltage.

The application adopts a co-precipitation method to prepare a NiZr / CoOx catalyst prepared by topological transformation of a layered double hydroxide (LDHs) precursor and a method for catalytic hydrogenation of biomass-derived compounds. The catalyst used is a NiZrCo catalyst prepared by a co-precipitation method. The method used is: adding unsaturated biomass-derived compounds into a reaction container containing a solvent, using isopropyl alcohol as a solvent and a hydrogen source, and realizing the hydrogenation reaction of aldehyde ketone compounds under the action of the NiZr / CoOx catalyst. In order to improve the catalytic activity of Co species in the hydrogenation reaction, Ni and Zr are doped in the cobalt salt to obtain the catalyst. The addition of Zr not only helps the dispersion of Ni and Co, but also provides acid sites for the catalytic system, the strong electronic interaction between metal species improves the catalytic activity, and the existence of oxygen vacancies provides adsorption sites for C=O in furfural, greatly improving the catalytic performance. The method for preparing the NiZr / CoOx catalyst doped with Ni, Zr and Co is simple, the process is easy to operate, the obtained catalyst has high activity, and exhibits good catalytic performance in the catalytic hydrogenation reaction of biomass-derived compounds. The catalyst has magnetism, and is convenient for recycling. In addition, the method uses an in-situ hydrogenation method to replace the traditional external hydrogen to provide a hydrogen source, and has high safety.

The invention discloses an LDO catalyst for an efficient CO2 methanation reaction and a preparation method thereof.The preparation method comprises the following steps that NiAlLDH of a hydrotalcite structure serves as a precursor, in-situ topological transformation is conducted in the hydrogen reducing atmosphere, and the LDO catalyst for the efficient CO2 methanation reaction is obtained. Meanwhile, full-spectrum response and a good photothermal effect are achieved.

The invention discloses a zither performance video content intelligent analysis and retrieval system, and belongs to the technical field of video content analysis and retrieval, the system comprises a multi-modal feature extraction module, a manifold topology transformation module, a semantic scene analysis module and a self-adaptive retrieval module, deep fusion of visual and audio features is realized through manifold topology transformation, and the video content is analyzed and retrieved. A topological structure is established based on Riemannian metrics, and precise recognition and time sequence segmentation of scenes such as technique display, track playing and teaching explanation are achieved. The adaptive retrieval module constructs a closed-loop feedback mechanism, dynamically adjusts feature extraction weights and measurement parameters according to retrieval confidence, and realizes continuous optimization of system performance, the problems of insufficient multi-modal information fusion, inaccurate scene recognition, low retrieval efficiency and the like in the prior art are solved, the scene recognition accuracy is improved by more than 12%, and the system performance is improved by more than 12%. And the retrieval precision is improved by more than 30%.

This invention discloses a catalyst for high-temperature CO2 hydrogenation to methanol, its preparation method, and its applications. The active component of the catalyst is a Mn-doped ZnZrO2 solid solution, prepared using a "crystal growth regulation-in-situ topological transformation" method: using amphiphilic block copolymers or CTAB as templates, a hierarchical porous structure is constructed through solvothermal-induced directional crystallization of the precursor; a topological transformation is achieved through staged heat treatment, resulting in atomically uniform Mn doping in the catalyst lattice; further oxidation and reduction treatments promote catalyst surface reconstruction, precisely controlling the oxygen vacancy density and acid-base distribution. Experimental results show that at high temperatures of 280–350 °C, the catalyst achieves a CO2 conversion rate >26.5%, a methanol selectivity >78%, and a space-time yield of 700 mg / (g). cat ·h ‑1 The performance degradation is less than 3% after 200 hours of operation. This invention effectively overcomes key challenges such as easy sintering of catalysts at high temperatures, uneven distribution of active sites, and low methanol selectivity, providing a high-performance and stable catalyst system for the efficient resource utilization of CO2.