168results about How to "Efficient conversion" patented technology

The invention provides a macro virus group sequencing library construction method for removing host ribosome RNA through an enzyme method and a kit, and belongs to the technical field of biology. The method comprises the following steps: hybridizing total RNA (Ribonucleic Acid) of a sample with a DNA (Deoxyribose Nucleic Acid) probe aiming at host ribosome RNA to form a DNA / RNA hybrid chain; rNase H is used for digesting RNA in the hybrid chain, and DNase I is used for digesting the remaining DNA probe in the system; purifying to obtain virus RNA (Ribonucleic Acid); carrying out fragmentation treatment on the virus RNA; carrying out reverse transcription on the fragmented RNA to synthesize a first chain cDNA, then synthesizing a second chain cDNA, and carrying out terminal repair and dA tail addition to obtain double-chain cDNA; connecting the linker with the dT tail with the double-chain cDNA; and carrying out PCR amplification and purification on the connection product to obtain the macro virus group sequencing library. According to the construction method and the kit, the problem that the full-length sequence of the virus cannot be obtained from a low-load sample can be solved.

The invention discloses a transformer substation secondary circuit drawing intelligent processing method and system, belongs to the technical field of electric power system digitization, and aims to solve the problems that the missing detection and false detection rate of old fuzzy drawings is high, a deep learning model lacks topological semantic understanding, full-process automation is insufficient, and structural management is lacked in conventional secondary circuit drawing processing. According to the core scheme, the method comprises the steps of segmenting an image through a U-Net network to generate masks, generating a structured topology table in combination with a primitive database, converting the structured topology table into nodes and directed edges with electrical attributes, constructing a queriable graph database integrating version management, rule check and a layout optimization algorithm, and finally generating a standard format drawing. According to the scheme, the primitive recognition and topology analysis precision is improved, deep mapping from images to electrical logic is achieved, full-process automation is achieved, version tracing and rule verification are supported, and standardized drawings are produced.

The invention belongs to the field of preparation of high-end carbon materials, and relates to a method for desulfurizing high-sulfur petroleum coke. The core of the invention is to construct a'desulfurization-acidification-regeneration 'three-step closed cycle system. The system takes magnesium oxide as a circulating medium, firstly magnesium oxide reacts with sulfur in petroleum coke at a high temperature to be converted into magnesium sulfide, then sulfur is released and recovered through an acidification step, meanwhile magnesium is converted into an intermediate product magnesium hydroxide, and finally, the magnesium medium is recovered to be active through a thermal regeneration step, magnesium oxide is obtained, and circulation is completed.

The invention relates to the field of biological catalysis, and discloses a method and a device for generating ursodesoxycholic acid through continuous flow catalysis of chenodeoxycholic acid. Comprising the following steps: (1) in the presence of first immobilized cells, carrying out a first catalytic reaction on a reaction system containing chenodeoxycholic acid to obtain a first product, the first immobilized cells expressing 7 alpha-hydroxysteroid dehydrogenase and lactic dehydrogenase; the concentration of the chenodeoxycholic acid in the reaction system is 40 to 70 mM; (2) adjusting the pH value of the first product to 8-9, and then in the presence of a second immobilized cell, carrying out a second catalytic reaction on the first product after the pH value is adjusted to obtain ursodesoxycholic acid, and the second immobilized cell expresses 7 beta-hydroxysteroid dehydrogenase and glucose dehydrogenase. According to the method, the stable activity of a catalytic system is kept, efficient conversion of high-concentration CDCA is achieved, meanwhile, precipitation of 7-KLCA is thoroughly avoided, and the synthesis efficiency, the product purity and the process continuity of UDCA are remarkably improved.

This invention relates to the field of fine chemical technology, specifically disclosing a production process for electronic-grade diethyl carbonate. The method includes the following steps: ethylene carbonate and anhydrous ethanol undergo a transesterification reaction in a microwave reactor catalyzed by a composite catalyst; the reaction solution is then subjected to phase separation treatment, followed by a continuous separation process coupling atmospheric and vacuum distillation to obtain an intermediate; further purification is achieved by molecular sieve adsorption to remove metal impurities and moisture, combined with precision filtration using a polytetrafluoroethylene membrane. The composite catalyst significantly improves the transesterification reaction efficiency and product selectivity. This process, through the synergistic effect of reaction process enhancement and multi-stage purification technology, achieves highly efficient removal of moisture, metal impurities, and nanoscale particles from the reaction system. The resulting electronic-grade diethyl carbonate meets the stringent requirements of high-end electronic chemicals such as lithium battery electrolytes, and possesses technical advantages such as short reaction cycle, thorough impurity removal, and high product purity.

The invention discloses a bamboo charcoal fiber cloth-based composite material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic shielding materials. The bamboo charcoal fiber cloth-based composite material comprises: a base cloth, which is a bamboo charcoal fiber cloth subjected to oxidation modification and activation treatment by TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxygen radical); the gradient copper layer is chemically plated on the surface of the base cloth; the nickel layer is chemically plated on the surface of the gradient copper layer; wherein the density of the base cloth side copper layer is smaller than that of the nickel layer and the copper layer. The bamboo charcoal fiber cloth is subjected to surface treatment modification through a special process, and meanwhile, a gradient copper layer and a gradient nickel layer are formed on the surface of the bamboo charcoal fiber cloth, so that the bamboo charcoal fiber cloth-based composite material with light weight, structural stability and excellent electromagnetic shielding performance is prepared, and the requirements of flexible and broadband electromagnetic shielding application are met.

A mangrove sediment-mediated seawater aquaculture tail water treatment method, comprising the following steps: pretreating seawater aquaculture tail water to remove large-particle impurities in the seawater aquaculture tail water; then introducing into an SBR tank for heterotrophic nitrification treatment; before the heterotrophic nitrification treatment, introducing mangrove sediment into the SBR tank and domesticating to enrich AOB bacteria; then introducing into an upflow denitrification filter for aerobic denitrification treatment, before the aerobic denitrification treatment, introducing mangrove sediment into the upflow denitrification filter and domesticating to enrich nirS type denitrifying bacteria; finally, disinfecting to remove pathogens in the seawater aquaculture tail water. The present application is based on a sequencing batch reactor and an upflow denitrification filter with domesticated mangrove sediment as activated sludge, and constructs a set of seawater aquaculture tail water treatment process, which can realize efficient removal of NH4 + -N, NO3 ‑ -N, COD and the like, and can maintain long-time operation.

The application relates to the technical field of molecular biology, and discloses a cold-tolerance identification method of Pennisetum based on a 65-core molecular marker set, a primer group and a gene chip and application thereof. The application collects core germplasm resources of the Pennisetum through a system, and constructs a GWAS population by using multi-environment (different altitudes) conditions, so that a wide genetic background and phenotype variation are fully covered, and a material foundation for genetic analysis of cold tolerance is laid. In the aspect of cold-tolerance phenotype identification, the application innovatively takes the chlorophyll content of leaves and the percentage of green leaves after natural low-temperature stress in autumn and winter fields as the cold-tolerance evaluation indexes, judges individuals with more than 40 excellent allelic variations as high-cold-tolerance varieties, and establishes a rapid and non-destructive phenotype screening method which can be implemented at the seedling stage.

The utility model relates to a kind of ladder form switch capacitor conversion circuit, conversion circuit includes ladder determination module, switch control module, output capacitor at least one flying capacitor;Current input end is connected with voltage output end in turn through at least two switch tubes, voltage output end is also grounded through output capacitor;One end of flying capacitor is connected between voltage input end and the common point of adjacent two switch tubes of voltage output end, its other end is grounded through a switch tube, and also be connected to the common point of output capacitor and voltage output end through another switch;When the ratio of input voltage and output voltage is non-integer, switch control module controls the charge-discharge process of flying capacitor, so that the voltage of last flying capacitor is equal to output voltage or input voltage.The present application realizes the efficient conversion of fixed integer ratio and / or non-integer ratio of input and output voltage by the switch capacitor control mode of multiple ladder, using the ladder voltage variation of flying capacitor.

The invention relates to a spatial analysis single cell state modeling method and system based on domain self-adaption and layered fine tuning, and the method comprises the steps: obtaining multiple immunofluorescence images and single cell segmentation masks, and constructing a no-label data set; constructing a mask auto-encoder composed of a ViT encoder and a linear decoder, adding a classification token in front of the image, carrying out field adaptive training on the mask auto-encoder based on the unlabeled data set, learning the classification token, and obtaining a field adaptive weight of the ViT encoder; obtaining a labeled data set; constructing a state embedding generation model, wherein the state embedding generation model comprises a shared ViT backbone network and a two-stage classifier; a classification token is added in front of an image feature sequence in the labeled data set, hierarchical training is carried out on the state embedding generation model, and the classification token is learned; and inputting the cell image blocks into the trained state embedding generation model, outputting a classification result and cell state embedding, and carrying out interpretability analysis. Compared with the prior art, the method has the advantages that accurate cell classification can be realized, and cell state representation with biological interpretability can be generated.

The invention discloses a quick-start compressed air energy storage system based on residual wind power absorption and a control method thereof. The system comprises a power divider, a lithium battery, a main compressor unit, at least one peak shaving compressor, a plurality of compression working medium flow valves, a plurality of air compressor interstage coolers, an air storage tank, a pressure regulating valve, a vortex tube, a distribution valve, a heat storage tank, a plurality of heat tank heat source supply flow valves, a cycle working medium flow valve, a turbine air inlet precooler, a turbine generator unit and an adsorption tower. An ORC power generation system and a power supply control and black start module; wherein the power supply control and black start module is used for executing corresponding control strategies according to various power grid operation data and wind power. The system can adaptively start the peak regulation compressor to absorb excess electric energy, and combines a hybrid frequency modulation architecture and a black start protocol, so that the system response speed, the energy storage density, the energy comprehensive utilization efficiency and the power grid supporting capability are remarkably improved, and efficient consumption and rapid peak regulation of wind power fluctuation are realized.

The embodiment of the application provides a method for converting a knowledge graph into a natural language large model training sample and related equipment, and belongs to the technical field of artificial intelligence. The method comprises the following steps: selecting a key anchor point from the knowledge graph based on a graph centrality measurement index; taking a key anchor point pair as a starting point and an ending point, extracting a symmetric element path connecting the two, and constructing a subgraph; generating multi-perspective paths for the same core entity through an anchor point switching mechanism; converting subgraph information into a (instruction, output) sample pair conforming to the instruction fine-tuning paradigm by using a structured information template, a path information template and a metadata enrichment template; and fine-tuning a large language model by using the generated corpus. By introducing the symmetric element path and the multi-dimensional instruction template, the embodiment of the application realizes semantic preservation and structured mapping of complex relationships in the knowledge graph, and effectively improves the knowledge understanding, reasoning and generalization ability of the large model in a specific field such as the power secondary equipment field.

This invention belongs to the field of lithium-sulfur battery technology, providing a zirconium-based flexible carbon nanofiber membrane, its preparation method, a lithium-sulfur battery cathode, and a lithium-sulfur battery. The preparation method involves mixing a zirconium source, a polymer, and an organic solvent to form a spinning solution; the spinning solution is electrospun to obtain a fiber membrane; the fiber membrane is then carbonized to obtain the zirconium-based flexible carbon nanofiber membrane. This invention yields a zirconium-based flexible carbon nanofiber membrane with high conductivity, a well-structured microstructure, and active sites for zirconium-based compound nanoparticles. The zirconium-based flexible carbon nanofiber membrane with its well-structured microstructure and active sites for zirconium-based compound nanoparticles exhibits excellent chemical / physical adsorption characteristics for polysulfides. Simultaneously, the zirconium-based compound nanoparticles possess excellent electrocatalytic properties, accelerating efficient conversion between polysulfides, achieving efficient electron transfer and ion diffusion, and realizing high sulfur utilization. This results in excellent areal capacity electrochemical performance. When used as a cathode in lithium-sulfur batteries, it enables the lithium-sulfur battery to exhibit outstanding rate performance and cycle stability, promoting the development of lithium-sulfur batteries towards low-altitude economic applications. Furthermore, the zirconium-based flexible carbon nanofiber membrane, when combined with a high-sulfur-loaded sulfur cathode (greater than 6 mg / cm³), further enhances the effectiveness of the process. 2 Together, they constructed a novel "sandwich" sulfur cathode, resulting in a high-capacity lithium-sulfur battery.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

The present application relates to a rare ginsenoside composition and a method and application thereof, wherein the ginsenoside composition comprises 0.02-0.1 mg / mL of S-Rg3, 0.009-0.029 mg / mL of R-Rg3, 0.087-0.245 mg / mL of Rg5 and 0.013-0.044 mg / mL of CK. The rare ginsenoside is prepared by fermentation, which comprises the following steps: step-by-step fermentation with yeast and lactic acid bacteria. Through the step-by-step fermentation method, the inherent ginsenoside is converted into rare ginsenoside, and 17 kinds of rare ginsenosides, including S-Rg2, R-Rg2, F1, F4, Rk3, F2, Rh4, S-Rg3, R-Rg3, PPT, Rg5, CK, S-Rh2, R-Rh2, Rk2, Rh3 and PPD, are obtained. The bioactivity of the fermented ginseng is higher, and the fermented ginseng can be applied to the food, medicine, health food and skin care product industries.

This application provides a fuel precursor, a fuel, and a method for preparing the same. The method for preparing the fuel precursor includes: mixing furanol, an organic extractant, water, and an acidic molecular sieve catalyst to obtain a mixture; heating the mixture under an inert atmosphere to obtain the fuel precursor. As the reaction proceeds, furanol continuously diffuses into the aqueous phase and reacts, while the organic extractant can promptly extract the target product, the fuel precursor, into the organic phase, avoiding further polymerization and improving the yield of the fuel precursor; furthermore, the two-phase system facilitates the separation and purification of the fuel precursor.

The application discloses a wave energy power generation device, and belongs to the technical field of wave energy power generation.The device comprises a floating ball shell for floating on the water surface, a wave sail assembly, a power generation assembly arranged in the floating ball shell, and a locking assembly arranged between the floating ball shell and the wave sail unit.The wave sail assembly comprises a plurality of wave sail units arranged around the center plane of the floating ball shell, and the wave sail units are hinged to the floating ball shell.The power generation assembly comprises a plurality of power generation units arranged along the radial direction of the floating ball shell, a heavy ball arranged at the center of the floating ball shell, and a cable.The heavy ball is connected to the plurality of power generation units through the cable, and the heavy ball can be driven by force from different directions to generate power for the corresponding power generation units.The locking assembly can lock the wave sail units on the wave-encountering side to receive the wave energy to the maximum extent.The device can reduce the resistance of the side wings, reduce the loss of wave energy, collect energy from different directions, and improve the utilization rate of wave energy.

The application discloses a key type specificity changed alpha-glucosyltransferase mutant, and belongs to the technical field of enzyme engineering and starch modification. The method is characterized in that, by analyzing the combination of Lf2970GtfB 4,3-alpha-glucosyltransferase in the active center donor / acceptor sub-site and the substrate, part of key amino acids of Lf2970GtfB are mutated into different types of amino acids, the mutant is prepared by changing the enzyme and substrate interaction force, space steric hindrance and other factors affecting the orientation of the substrate in the active center, the transglycosylation is changed, and the bond type composition of the product is changed. The application changes the bond type specificity of Lf2970GtfB 4,3-alpha-glucosyltransferase by mutation, the obtained mutant has novel 4,3 / 6-alpha-glucosyltransferase activity, and is helpful to synthesizing unique structure and more valuable alpha-glucan by using starch substrates.

According to the catalyst for preparing olefin from synthesis gas and the preparation method, by means of the pore channel structure of porous carbon, active metal cobalt and iron are loaded in pore channels of a porous carbon carrier in a layered mode, an auxiliary is loaded on the surface of the porous carbon carrier, and due to the fact that the catalytic activation temperature of cobalt is lower, the catalytic activity of the catalyst is improved; the synthesis gas conversion reaction can be firstly started at a relatively low temperature, so that energy waste caused by activation of iron at a high temperature is avoided; an iron-based catalyst is high in activity but serious in internal diffusion, iron in a porous carbon carrier pore channel is difficult to quickly contact a reactant and start a reaction, and after cobalt is activated firstly, heat is transferred through a reaction atmosphere in the pore channel to drive the iron in the pore channel to participate in the reaction. Therefore, the catalyst provided by the invention does not need to depend on the high-temperature activation condition of iron, and the activity temperature of the whole catalyst is lowered; meanwhile, a large amount of iron serves as a main active center, and synthesis gas can be efficiently converted.

This application discloses a method for the conversion of C4-C6 alkanes. In a reactor, a raw material containing hydrogen and C4-C6 alkanes is contacted with a catalyst and reacted to obtain a product containing small molecule hydrocarbons; the C4-C6 alkanes are selected from at least one of n-butane, isobutane, n-pentane, isopentane, and 2,3-dimethylbutane; the small molecule hydrocarbons are selected from at least one of ethane, propane, n-butane, and n-pentane; the catalyst is prepared by the following steps: (1) mixing clay and sol, spray drying to obtain microspheres with a diameter of 1-50 μm; (2) immersing the microspheres in an aqueous solution containing a noble metal precursor, drying I, calcining I, and treating with a hydrogen atmosphere to obtain a catalyst precursor; (3) mixing the catalyst precursor, molecular sieve, and additives, rolling to form spheres, drying II, calcining II, and reducing to obtain the catalyst.

The application discloses a dry gas deep desulfurization process. The process comprises the following steps: (1) removing hydrogen sulfide from refinery dry gas through a first-stage amine liquid absorption tower; (2) removing organic sulfur from tail gas of the first-stage amine liquid absorption tower in a low-temperature absorption tower; (3) sequentially exchanging heat between the absorption tail gas and raw dry gas, and between the absorption tail gas and hydrolysis tail gas, and then heating the absorption tail gas, and then inputting the absorption tail gas into a hydrolysis reactor to convert carbonyl sulfur into hydrogen sulfide; and (4) inputting the hydrolysis tail gas into a second-stage amine liquid absorption tower, and countercurrently absorbing the hydrolysis tail gas with lean amine liquid in the tower to remove hydrogen sulfide in the dry gas. The application can purify and remove sulfides in the dry gas, reduce the content of organic sulfur and hydrogen sulfide in the gas, reduce the content of SO2 in flue gas discharged from a heating furnace of each subsequent device, and ensure safe, environmentally-friendly and efficient and stable operation of the heating furnace of the whole plant.

The invention discloses high-purity heat-resistant quartz ceramic and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials, the high-purity heat-resistant quartz ceramic comprises the following raw materials by mass fraction: 50-80% of a fused high-purity quartz raw material, 10-50% of fused high-purity quartz fine powder, 0.1-1% of a composite mineralizer, and 0.1-5% of a binder; the content of CaO in the high-purity heat-resistant quartz ceramic is less than or equal to 0.1%. The aspects of raw material deep processing, additives, the preparation process and the like are strictly controlled, the addition of calcium-containing substances is avoided, the eutectic point phase is fundamentally reduced, the alkali corrosion resistance and the high-temperature strength are further improved, and the finally obtained quartz ceramic has the advantages of high refractoriness under load, excellent thermal shock resistance and corrosion resistance, and the service life of the quartz ceramic is prolonged. The method is suitable for severe environments such as oxy-fuel combustion glass kilns.

The invention relates to the technical field of elastic bushings, in particular to a magneto-rheological elastomer bushing for an automobile suspension and a vehicle suspension system. The magneto-rheological elastomer bushing comprises an inner sleeve and an outer sleeve which are coaxially arranged; the magnetorheological elastomer layer is filled between the inner sleeve and the outer sleeve, and the magnetorheological elastomer layer serves as a main bearing and rigidity adjusting component; the magnet exciting coil is arranged on the inner sleeve or the outer sleeve, and the magnet exciting coil applies a magnetic field to the magnetorheological elastomer layer to adjust the radial rigidity of the magnetorheological elastomer layer; the magneto-rheological elastomer composite material further comprises at least one magnetic conductive reinforcing piece which is arranged in the magneto-rheological elastomer layer in the radial direction, and the magneto-rheological elastomer layer is divided into at least two sub-layers in the radial direction by the magnetic conductive reinforcing piece. The rigidity of the vehicle can be instantly improved to enhance the control stability when high supporting performance is needed, the rigidity can be instantly reduced to optimize the riding comfort when high vibration filtering performance (such as a bumpy road surface) is needed, and dynamic intelligent balance between the two is achieved.

The invention discloses a heterogeneous environment prediction model training and deployment method and system, and relates to the field of prediction model training. In order to overcome the defects that an existing model training and deployment method is large in development difficulty, low in deployment efficiency and lack of unified management of multiple versions, an integrated development environment and an integrated development framework are used, and multiple pre-training models and operators are built in; carrying out data preprocessing and exclusive model building, obtaining training data to carry out model training, and generating a training model; all training models are arranged in a model center for unified management; aPI service development is carried out, a unified model algorithm reasoning framework is adopted, self-defined service development is carried out, and self-defined AI service is generated; the AI service is audited and published to be online, and the online AI service is used by an external application; based on distributed task scheduling and service arrangement, AI services are scheduled and run on a service running platform. The method is mainly used for establishing the prediction model for the heterogeneous environment.

The invention relates to a photoelectric sensing element, a photoelectric sensing array and a preparation method, the photoelectric sensing element comprises a substrate, a transistor module and a photoelectric detection module, the transistor module comprises a grid electrode, a first dielectric layer, an active layer, a first source electrode, a first drain electrode and a first passivation layer; the photoelectric detection module is sequentially provided with a second dielectric layer, a second source electrode, a second drain electrode and a second passivation layer from bottom to top; the first source electrode, the first drain electrode, the second drain electrode, the second source electrode and an external reading circuit are connected in series to form a loop; and a photosensitive induction layer of the photoelectric detection module is filled into a channel between the second source electrode and the second drain electrode. The transistor module and the photoelectric detection module are integrated on the substrate and are connected in series to form a complete loop, and the photosensitive sensing layer made of the two-dimensional transition metal chalcogenide is adopted, so that efficient capture, conversion and output of optical signals are realized, the sensitivity and response speed of optical signal detection are improved, and the structural stability of the device and the accuracy of signal transmission are guaranteed.

The invention discloses a carrier supported multi-metal sulfide state nickel-based catalyst as well as a preparation method and application thereof. The catalyst is composed of a porous carrier loaded NixMySz active phase, M is a combination of at least one metal element of Co, Fe, Cu, Zn or Mn, multiple metal components form a synergistic structure in the vulcanization process, and through construction of Ni-S-M bonds, pinning effect generation and electron interaction, controllable adjustment of the sulfide structure is achieved, and the stability of the catalyst is improved. The catalyst is obtained by loading a nickel-second metal precursor on a porous carrier, roasting to form an oxide, vulcanizing in a sulfur-containing atmosphere, and activating. The obtained catalyst has an adjustable Ni: M molar ratio, a sheet-like or petal-like nanostructure and high-density sulfur defects. The catalyst is suitable for decarbonylation-dehydration reaction of bio-based fatty acid or derivatives thereof, and can efficiently convert C10-C20 fatty acid, methyl ester or ethyl ester thereof, and animal and vegetable oil or waste oil containing the components into long-chain olefin at 200-350 DEG C under 0.1-3 MPa.

The invention provides an X-ray luminescent crystal material containing heavy atoms as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The chemical formula of the X-ray luminescent crystal material is 2XL at-AMnBr4, 2XL represents dihalogen substituted p-phenylenediamine hydrobromide, halogen atoms are one or two of Cl, Br and I, and A represents crown ether. According to the invention, heavy atoms are introduced into the organic cation module of the organic-inorganic hybrid metal halide through the multistage supramolecular self-assembly effect for the first time, the luminescence property and stability of the X-ray luminescent material are improved, and the luminescent quantum yield reaches 60% or more. The X-ray luminescent material provided by the invention is used as a scintillator of a core component, can efficiently convert X-rays into visible light signals, and provides more accurate and rapid analysis and detection for multiple fields such as safety inspection, scientific research, medical diagnosis and the like.

This invention discloses a porous carbon-supported copper catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The invention uses three-dimensional interconnected ordered porous carbon (NCP) with a large-pore structure as a support, tetraphenylporphyrin copper(II) and tetraphenylporphyrin as nitrogen and copper sources, and KOH or NaOH as activators. An NCP precursor adsorbed with tetraphenylporphyrin copper(II), tetraphenylporphyrin, and an alkaline component is obtained through a two-step adsorption process. This precursor is then pyrolyzed at 600-900℃ under nitrogen protection, cooled to room temperature, and washed with water to obtain the porous carbon-supported copper catalyst (NCP@NC-Cu). This catalyst retains a three-dimensional interconnected porous structure, with the active component (copper species) mainly distributed within the pores of the NCP support, and possesses a large specific surface area and abundant nitrogen. The catalyst was applied to the N-formylation reaction of amines with CO2 and H2 to prepare formamide compounds, exhibiting excellent catalytic activity, recyclability, and good substrate versatility, showing promising application prospects.

The invention relates to a genotype-dependence-free dendrobium nobile genetic transformation method and application, and belongs to the technical field of genetic engineering. Comprising the following steps: taking embryonic calluses, protocorms or protocorm-like bodies of dendrobium nobile as explants; introducing the binary vector carrying the target gene into agrobacterium to prepare an infection solution, and infecting the explant; after co-culture, transferring to a culture medium containing a screening agent to obtain a resistant explant; and carrying out differentiation and rooting culture to obtain a transgenic plant. By systematically optimizing a plant growth regulator combination, an agrobacterium strain type, an infection mode and an auxiliary screening mode, an efficient and stable genetic transformation system which does not depend on a specific genotype and takes multiple types of explants as receptors is established for the first time, and the problems that a traditional method is high in genotype dependency and limited in tissue type are solved; the method shows good applicability and repeatability in a plurality of dendrobium hybrids, and provides a general technical platform for gene function research and molecular breeding.