1914 results about "Light irradiation" patented technology

The invention discloses a mineral separation workshop inspection method based on an unmanned aerial vehicle, and relates to the technical field of mineral separation workshop inspection, and the method specifically comprises the following steps: when an image collected by the unmanned aerial vehicle is affected by oblique light irradiation, recognizing a region with shadow interference characteristics in the image, and uniformly dividing the region into a plurality of sub-regions; extracting image disturbance feature information of each sub-region from the image acquired by the unmanned aerial vehicle, analyzing the image disturbance feature information, and determining a shadow gray scale disturbance degree and a disturbance type of each sub-region; and according to the disturbance type of each sub-region, respectively executing a trend judgment strategy of the corresponding crack identification path, and carrying out dynamic regulation and control. According to the method, the problems of crack and shadow confusion and path judgment deviation caused by oblique light irradiation when the unmanned aerial vehicle obliquely shoots the preparation equipment are solved, classification identification and dynamic path regulation and control based on image disturbance intensity are realized, and the accuracy of crack identification, the stability of path judgment and the intelligent degree of inspection tasks are effectively improved.

The invention provides a machine vision light source control method and system, and the method comprises the steps: carrying out the spatial analysis of ambient light state data of a machine vision scene, obtaining the spatial distribution information of ambient light, and determining an ambient light illumination abnormal region on the surface of a target object through combining the spatial attitude information of the target object in the machine vision scene; based on the distribution state information of the abnormal ambient light irradiation area on the surface of the target object, adjusting the supplementary lighting irradiation state of the light source, analyzing the global image of the surface of the target object, determining the bright spot distribution information of the surface of the target object, and comprehensively positioning the area range with excessively concentrated brightness generated by supplementary lighting irradiation; based on the hot spot distribution information, the irradiation light intensity distribution of the light source is dynamically adjusted, and the corresponding optimal adjustment parameters are determined, so that the light emitting state adjustment or light ray state modulation is performed on the light source, a flexible and locally adjustable supplementary lighting mode is provided for machine vision recognition, and the applicability of the machine vision light source to different scenes is improved.

The invention provides a grafting method and system for reinforcing UV glue based on ultraviolet interference, the system comprises a spraying and irradiating integrated device, a clamping mechanism and a cutting mechanism, the clamping mechanism is used for clamping a scion and a stock to be grafted and driving the scion and the stock to move close to or away from each other along a straight line; the cutting devices are arranged on the two sides of the clamping mechanism and used for cutting the scion and the stock to form an inclined cutting face used for grafting butt joint. The spraying and illuminating integrated device is arranged on the side portion of the grafting butt joint position in the middle of the clamping mechanism and used for spraying UV glue to the grafting butt joint position of the scion and the stock and conducting light irradiation on the UV glue so that the UV glue can be rapidly cured. Under the comprehensive synergistic effect of the spraying and irradiating integrated device, the clamping mechanism and the cutting mechanism, automatic shearing, butt joint, UV glue spraying and UV glue curing of grafting are achieved, and the grafting efficiency is greatly improved.

A photobase generator includes a compound including: first skeletons represented by the following formula (a); and a second skeleton including nitrogen atoms bonding to bonding positions of the first skeletons to form amide groups, wherein, in a molecule, a number of the first skeletons is two or more, a number of the nitrogen atoms, configuring the amide groups, in the second skeleton is the same as the number of the first skeletons, and at least one of the nitrogen atoms configuring the amide groups is converted into a nitrogen atom configuring a secondary amine or a tertiary amine by light irradiation. In the formula (a), G is a divalent aromatic group, and * represents the bonding position with the nitrogen atom.

The invention provides a perovskite thin film and a preparation method thereof, and belongs to the technical field of perovskite thin films, and the preparation method comprises the following steps: S1, preparing modified octa (aminophenyl trioxosilane); s2, preparing a precursor solution; and S3, spin-coating the pretreated substrate with the precursor solution, dropwise adding ethyl acetate at the same time, performing illumination treatment under ultraviolet light, and then immediately performing micro-vibration and curing annealing on the substrate to obtain the perovskite thin film. According to the perovskite thin film obtained by the invention, the purposes of synchronously increasing the open-circuit voltage and the filling factor of a solar cell, improving the photoelectric conversion efficiency and enhancing the long-term stability can be achieved.

The invention discloses light self-repairing concrete and a preparation method thereof, and relates to the technical field of concrete. The method comprises the following steps: firstly, efficiently packaging a calcium nitrate solution in hollow glass beads by utilizing a negative pressure impregnation technology; then growing a porous zeolite crystal coating on the surface of the microbead in situ by adopting a sol-gel method to form a self-repairing filler with a core-shell-hole gradient structure; when the concrete cracks to cause the cracking of the microbeads, the Ca < 2 + > in the cavity is quickly released, and the Ca < 2 + > adsorbed in the zeolite layer is gradually dissociated along with water permeation, so that the new microcracks are continuously repaired. Then, uniformly coating the surface and pores of the carboxymethyl cellulose hydrogel network with polydopamine in an in-situ oxidative polymerization manner to form composite hydrogel with photo-thermal responsiveness; lighting and heating to trigger dynamic coordination bond dissociation; meanwhile, heat drives rapid directional crystallization of a repair product by promoting the ion diffusion rate, and a compact mineralization layer is formed. The concrete prepared by the invention has the effects of light weight and self-repairing.

The invention discloses a nanosecond particle velocity measurement method based on orthogonal line polarization beam splitting, and belongs to the technical field of particle image velocity measurement. The method comprises the following steps: providing two linear polarization state orthogonal double-pulse lasers, and respectively outputting S polarization pulse light beams and P polarization pulse light beams; the four pulse light beams are combined through the double-path laser beam combining mirror set and output to the sheet light mirror set, and a plane illumination jet flow field with the thickness smaller than or equal to 1 mm is formed; scattered light is separated according to a polarization state by using a polarization beam-splitting cubic prism, and particle images under S polarization and P polarization are respectively captured by two double-exposure cameras which are orthogonally arranged; five kinds of time sequence control are triggered through a multi-channel synchronous controller; processing the view field deviation of the two cameras by adopting a block polynomial alignment method; and calculating a particle velocity field based on a particle tracking velocity measurement algorithm. According to the invention, the polarization debugging error is reduced, the homogeneity error after beam combination is obviously reduced, the coincidence degree of the four beams of planar light is improved, and a high-precision universal alignment scheme is provided for the multi-camera PTV technology.

The invention discloses photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking as well as a preparation method and application of the photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking, the hydrogel is prepared by taking azide group-containing four-arm polyethylene glycol and alkynyl modified hyaluronic acid as matrixes through click chemistry rapid crosslinking under the catalysis of copper-based nanoparticles, the antibacterial biological membrane has remarkable dual anti-biological membrane and anti-inflammatory effects, and can be applied to wound treatment of bacterial biological membrane infection; through a wound surface coating form, under near-infrared light irradiation, copper nanoparticles generate a mild photothermal effect to remove a biological membrane, and Cu < 2 + > is released to promote fibroblast proliferation; nitric oxide can be controllably released, a biological membrane is synergistically eliminated by enhancing lipid peroxidation and destroying a bacterial membrane structure, meanwhile, angiogenesis is promoted, collagen deposition is stimulated, and the wound healing process is accelerated; the invention has the functions of efficient antibiosis and tissue regeneration, and has wide clinical application prospect and development value in the field of infectious wound treatment.

The invention discloses a preparation method for selectively oxidizing thioether into sulfoxide through photo-initiation, and belongs to the field of synthesis of medical compounds. The preparation method comprises the following steps that in the air atmosphere, a thioether compound is dissolved in an acetonitrile-water mixed solvent, inorganic metal salt catalysts such as ferric chloride and copper sulfate are added, the mixture reacts for 8-48 h at the temperature of 0-45 DEG C under illumination with the wavelength of 295-405 nm, selective oxidation is carried out, and the sulfoxide product is obtained, and the molar ratio of thioether to the catalysts is 5: 1. The method overcomes the problems of excessive oxidation risk, complicated operation, environmental pollution and the like caused by dependence of a noble metal catalyst and use of a strong oxidant in the existing thioether oxidation method, has the advantages of high catalytic efficiency, high yield and excellent selectivity, can greatly reduce the production cost, is suitable for later industrial synthesis and amplification, and has wide application prospects. The method has the advantages of no expensive metal catalyst or oxidant, simple preparation process, high efficiency, environmental protection, safety and cost saving.

The invention discloses a high-reliability PbS quantum dot film, a preparation method thereof and a photoelectric device. The preparation method comprises the following steps: 1) obtaining a first quantum dot solution; 2) adding medium-chain and long-chain amine; 3) adding an anti-solvent; 4) obtaining medium-chain and long-chain amine modified PbS quantum dot solids; 5) obtaining a second quantum dot solution; (6) forming a PbS quantum dot coating; 7) forming a mercaptan solution; 8) coating the PbS quantum dot coating with a mercaptan solution; (9) annealing treatment; 10) forming a new PbS quantum dot coating, and coating the new PbS quantum dot coating with a mercaptan solution; according to the PbS quantum dot thin film and the preparation method thereof, through the induction and synergistic effect of halogen atoms, the binding capacity of halogenated mercaptan ligands and the surface of the PbS quantum dot thin film is enhanced, the surface defect state of the PbS quantum dots is effectively inhibited, and the reliability of the PbS quantum dot thin film and a photoelectric device under the conditions of high temperature, high humidity and long-time illumination is remarkably improved.

The invention relates to the technical field of transmission membranes, in particular to a transmission membrane based on dithienylethene and a preparation method of the transmission membrane. The transmission film comprises a base film and light-operated molecules, the base film is coated with the light-operated molecules, and the light-operated molecules have light response groups. A detection result shows that after ultraviolet irradiation, the transmission film can quickly realize complete conversion from an open loop to a closed loop; after visible light irradiation is recovered, the transmission film can efficiently and reversibly recover to an open-loop state. In addition, the transport membrane has a high on-off ratio to five ions of sodium, potassium, lithium, magnesium and calcium. The transmission membrane based on dithienylethene, which is prepared by taking terminal amino-modified dithienylethene as a basic unit, not only has abundant nano-channels, but also is endowed with the characteristic of regulating and controlling the opening and closing of the nano-pore by a photoresponse functional group, and the closing and opening of an ion channel can be accurately regulated and controlled through the alternate irradiation of ultraviolet light and visible light, so that the transmission membrane has a good application prospect. And the controllability of light-operated ion transmission is finally realized.

The invention discloses a method and a device for quantitatively detecting active microorganisms in a solid / semi-solid sample, and belongs to the field of microorganism detection. According to the method, detection is carried out based on a PMA-qPCR method, influence factors of the stability of an experimental result are analyzed, and a stability analysis model is constructed; the stability analysis model is shown in the specification; wherein S is a comprehensive stability score, and the higher the S value is, the better the stability of the experiment result is; the weight coefficient is the weight coefficient of the ith influence factor; the performance function is the performance function of the ith influence factor; the influence factors comprise sample suspension dilution ratio, PMA dye concentration, dye incubation time, blue light irradiation time, blue light irradiation area and impurity particle size. The method can be used for simultaneously detecting the activity of various microorganisms in a solid / semi-solid sample, the accuracy is high, the experimental period is short, and the quantitative result has important guiding significance.

The invention discloses a method for degrading polystyrene (PS) plastic and upgrading and recycling the PS plastic into benzoic acid based on nano MnO2 photocatalytic ozonation, and belongs to the technical field of solid waste recycling. The method comprises the following steps: firstly, mixing PS plastic fragments with nano MnO2 and an organic solvent, then simultaneously introducing ozone into a reaction system at normal temperature and normal pressure, and irradiating with light. Through synergistic catalysis of light and ozone, molecular chains of the PS plastic can be efficiently and selectively broken and oxidized, and finally the PS plastic is directionally converted into benzoic acid with high additional value. After the reaction is finished, a benzoic acid product can be obtained through simple separation, concentration and purification steps. The method provided by the invention realizes high-valued recycling of the waste PS plastic under mild conditions, solves the problems of high energy consumption, complex products, easy generation of secondary pollution and the like in a traditional treatment method, and has the outstanding advantages of green process, efficient reaction, high product value and the like.

The invention discloses a hydroxyl-rich ruthenium / titanium dioxide catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, loading a ruthenium precursor on a titanium dioxide carrier by adopting an impregnation method or a deposition-precipitation method, and drying and calcining to obtain a Ru / TiO2 catalyst; and step 2, placing the Ru / TiO2 catalyst in an atmosphere environment containing water vapor or forming a physical adsorption water film on the surface of the Ru / TiO2 catalyst, and performing ultraviolet irradiation treatment to obtain the Ru / TiO2 catalyst. According to the method, water is physically adsorbed through ultraviolet light dissociation, hydroxyl is directly generated on the surface of Ru / TiO2 in an in-situ mode, the method is easy to operate, complex liquid phase treatment is not needed, and the stability of the generated hydroxyl under the subsequent high-temperature gas-solid phase hydrogen-rich reaction condition is obviously superior to that of hydroxyl introduced through a traditional method. The stable hydroxyl enriched on the surface serves as an effective Lewis base site and cooperates with a Ru active site, adsorption and activation of CO2 molecules are remarkably promoted, and therefore the catalytic activity of the CO2 methanation reaction is greatly improved.

The invention discloses modified asphalt and a preparation process thereof, and belongs to the technical field of road materials. The modified asphalt is prepared from 80-90 parts of matrix asphalt, 4-8 parts of butadiene styrene rubber, 2-5 parts of nano montmorillonite, 1.5-3 parts of core-shell structure nanoparticles (the core is SiO2 grafted with-SO3H, the middle layer is thermo-sensitive PNIPAM containing a photoinitiator, and the shell is GO grafted with a hindered phenol antioxidant group and a photosensitive coumarin group), 1-3 parts of a compatilizer, 3-6 parts of a plasticizer and 0.3-0.8 part of an antioxidant. The preparation process comprises the following steps: pretreating the modifier master batch, performing melt blending, performing high-speed shearing, performing ultrasonic dispersion, cooling, discharging and the like. The light response crosslinking mechanism is utilized, crosslinking is achieved under illumination through the light response characteristic of the core-shell structure nanoparticles, the high-temperature stability, the anti-aging performance and the fatigue life of the modified asphalt are remarkably improved, and the modified asphalt is suitable for the fields of high-grade road construction and the like.

The invention discloses a face recognition method based on multi-modal fusion, and belongs to the technical field of face recognition, in the face recognition method, when visual information is lost due to face partial shielding or strong light irradiation, emotion features in voice signals can automatically compensate for the deficiency of visual information. For example, in a video call scene, when a user shields a chin area with a hand, the system can still accurately recognize anxiety emotion by analyzing intonation trembling characteristics in voice and combining muscle movement of an unshielded eyebrow and eye area, and misjudgment caused by local information loss is avoided. Meanwhile, under the condition that noisy background sound interferes voice, the model can effectively filter interference of voice noise and maintain accuracy of emotion judgment by capturing continuous duration and intensity changes of facial micro-expressions, such as slight twitching of mouth corners lasting for more than 3 seconds.

To facilitate axis matching of signal light to be communicated in a bidirectional manner.SOLUTION: A first optical communication device 10 comprises: a light radiation element 11 which radiates transmission signal light (first communication light L1) toward a second optical communication device 20 of a communication target; a lens 12 on which reception signal light (second communication light L2) from the second optical communication device 20 of the communication target is incident; and a light-receiving element 13 which receives the reception signal light that is condensed by the lens 12. A through hole 12a is provided in the lens 12. The light radiation element 11 is disposed on a virtual line L0 along the through hole 12a so as to perform the radiation while making an axis of the transmission signal light parallel with an optical axis Op of the lens 12 in such a manner that the lens 12 is not irradiated with the transmission signal light, and the light-receiving element 13 is disposed at a position where the reception signal light condensed by the lens 12 can be received in a case where an axis of a center of the transmission signal light radiated from the light radiation element 11 overlaps an axis of a center of the reception signal light incident on the lens 12.SELECTED DRAWING: Figure 1

The utility model discloses a peripheral out-of-focus lens assembly and glasses, and the assembly comprises a basic lens which generates perspective focal power for perspective light; the single image source is arranged at the edge position of the near-eye side of the basic lens and is far away from the basic lens; the plurality of light splitting surfaces are embedded into the basic lens and are distributed in the basic lens at different inclination angles, and the central normal lines of the plurality of light splitting surfaces are inclined to the side where the image source is located relative to the central normal line of the lens; the light irradiation range of a single image source covers all the light splitting surfaces; each light splitting surface and the shared image source form an out-of-focus unit, each light splitting surface is used for reflecting light rays emitted by the image source to form convergent light rays, the convergent light rays are emitted to an exit pupil position, and an out-of-focus image is formed after the convergent light rays enter human eyes; a plurality of out-of-focus images formed by reflection of the plurality of light splitting surfaces are respectively distributed in a peripheral view field. The peripheral out-of-focus lens assembly and the glasses are used for realizing out-of-focus stimulation, inhibiting eye axis growth and achieving the purpose of preventing and controlling myopia.

The utility model relates to a light-operated calibration tool. The light-operated calibration tool particularly comprises the controllable photoresistor branch circuit, the controllable resistance value of the controllable photoresistor branch circuit can be accurately calculated by means of the known resistor branch circuit and the voltage measurement branch circuit, and then the light-operated calibration tool can be accurately calibrated by means of the characteristics that the resistance value of a photoresistor in the controllable photoresistor branch circuit is controllable when the photoresistor is illuminated and the resistance value of the photoresistor is stable. Any required accurate resistance value is provided for calibration, a standard resistor disc does not need to be replaced frequently, damage to a calibration instrument is avoided, safety is improved, meanwhile, testing of resistance values in different ranges of the to-be-tested equipment can be completed with high flexibility, and finally high-safety, flexible and accurate dynamic calibration of the to-be-tested equipment is achieved.

The invention discloses a method for preparing a super-hydrophobic antibacterial fabric with a photothermal effect. The method first loads a photothermal preparation on the surface of the fabric to impart photothermal properties, and then introduces a composite coating formed by hydrophobic silica nanoparticles and a silane coupling agent with an alkane chain to reduce the surface energy of the material and construct a micro-nanoscale rough structure, thereby preparing an antibacterial fabric with excellent photothermal and super-hydrophobic properties. The super-hydrophobic antibacterial fabric prepared by the invention has a fabric surface water contact angle of 158° and a surface temperature of 120°C under near-infrared light irradiation, showing excellent photothermal cycle stability and super-hydrophobic high temperature resistance. The super-hydrophobic antibacterial fabric has an antibacterial rate of over 99.0% under the synergistic effect of passive super-hydrophobic antibacterial adhesion and active photothermal sterilization, and has a wide antibacterial range and a long antibacterial life.

The invention discloses an imidazole derivative curing agent and a preparation method of a space stiffening material with low volatility and high stability, and belongs to the field of preparation of space developing materials. The method comprises the following steps: mixing a light curing agent, an imidazole derivative curing agent, acrylate resin and epoxy resin, vacuumizing, removing bubbles, pouring into a standard dumbbell spline mold, carrying out ultraviolet irradiation for 10-20 minutes to prepare a flexible material of a first network, then pre-curing at 130-150 DEG C for 3-4 hours, and curing at 170-180 DEG C for 3-5 hours to obtain a rigid material. Through molecular synthesis scheme design, the high-molecular-weight imidazole derivative is prepared, the reaction activity is reduced, the storage life is prolonged, and the problems of small molecule migration and vacuum gas outlet are solved. Due to the molecular scheme design, more imidazole groups are introduced to a molecular chain and can be coordinated with metal ions to form ionic bonds, so that the reaction activity can be further reduced, the storage period can be prolonged, the molecular weight can be correspondingly increased, and the migration condition can be inhibited.

The present invention addresses the problem of providing an antioxidant composition having durable antioxidant activity.　The present invention provides: an antioxidant composition containing, as an active ingredient, a light-irradiated product of a grape pomace extract or a new compound contained in said light-irradiated product; and a method for producing a durable antioxidant material, the method including a step for pressing a grape raw material in a wine production process to obtain a grape pomace extract including grape skin and seeds, and a step for irradiating the obtained grape pomace extract with light.

The invention belongs to the technical field of nano-carriers, and particularly relates to a casein-based nano-carrier with slow release and pH / NIR dual response as well as a preparation method and application thereof, casein is combined with hollow copper sulfide nano-particles to load drugs, the nano-carrier with slow release and pH / NIR dual response is generated, and the drug loading rate is as high as 96.84%. Experiments show that the nano-carrier can accurately control drug release under specific pH and near-infrared light irradiation, so that the drug treatment efficiency is improved, and side effects on normal tissues are reduced.

The invention relates to the technical field of antitumor drugs, in particular to a Ru (II) complex and a preparation method and application thereof, and the Ru (II) complex has a structure as shown in a formula I. The Ru (II) complex synthesized by the method disclosed by the invention not only has relatively high cytotoxicity, but also has good photodynamic antitumor activity. After the complex is illuminated, the efficiency of the complex entering cells in an active transportation mode can be accelerated, mitochondria and endoplasmic reticulum are targeted at the same time, mitochondrial membrane potential decline and endoplasmic reticulum stress are caused to form a dual organelle damage effect, immunogenic cell death is caused, the tumor microenvironment is adjusted, and the tumor cell immunogenicity is improved. The enrichment of dendritic cells (DCs) in tumor cells is realized, the chemotactic activity of effector T cells is improved, the proportion of CD4 < + > and Foxp3 < + > cell populations is reduced, and finally the anti-tumor immune response is activated. Meanwhile, the complex provided by the invention can also induce the cell to generate pan apoptosis, retard the cell cycle in the G2 / M period and enhance the effect of the complex in inhibiting tumor proliferation.

Illumination devices for impinging light on tissue, for example within a body cavity of a patient, to induce various biological effects are disclosed. Biological effects may include at least one of inactivating and / or inhibiting growth of one or more pathogens, upregulating a local immune response, increasing endogenous stores of nitric oxide, releasing nitric oxide from endogenous stores, and inducing an anti-inflammatory effect. Biological effects may include upregulating and downregulating inflammatory immune response molecules within a target tissue. Wavelengths of light are selected based on intended biological effects for one or more of targeted tissue types and targeted pathogens. Light treatments may provide multiple pathogenic biological effects, either with light of a single wavelength or with light having multiple wavelengths. Devices for light treatments are disclosed that provide light doses for inducing biological effects on various targeted pathogens and tissues with increased efficacy and reduced cytotoxicity.

A long-persistent luminescence emitter containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein, 70 mol % or more of an electron donor structural unit and less than 30 mol % of an electron acceptor structural unit, or containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein. 70 mol % or more of an electron acceptor structural unit and less than 30 mol % of an electron donor structural unit. The emission decay after stopping light irradiation to the emitter is power law decay.

The invention discloses a silver vanadate photocatalytic material, a preparation method thereof and an illuminating lamp. The preparation method comprises the following steps: firstly, respectively dissolving NH4VO3 and AgNO3 in deionized water, uniformly mixing by magnetic stirring, adjusting the pH value of the solution, and then carrying out hydrothermal synthesis reaction to obtain the Ag3VO4 photocatalytic material. The Ag3VO4 photocatalytic material with controllable morphology, uniform particle size and good dispersity is prepared by adopting a synthesis strategy of a one-step hydrothermal method, the performance of the photocatalyst is optimized by regulating and controlling the pH value, the raw materials and the process are simple, the conditions are easy to control, the cost is low, the photocatalytic degradation rate of the catalyst to organic pollutants is high, and the method is suitable for industrial production. The stability of a crystal structure and catalytic activity can be kept under long-term illumination, and the functional application of a photocatalytic air purification technology can be realized by integrating with an illumination lamp.

The invention belongs to the technical field of organic synthesis and medicinal chemistry, and discloses a total synthesis method of rhododendron heteroterpenin Rhododaurines A-C. The total synthesis method comprises the following steps: carrying out allyl stereoselective addition on a compound 3 and a compound 5 in a toluene solvent under the conditions of catalysis of n-butyllithium and low temperature of-78 DEG C, and constructing a chiral center to obtain a compound 6; removing a methoxy methyl (MOM) protecting group from the compound 6 under an acidic condition, cyclizing, and reacting to generate rhododaurine C (7); the rhododaurine C (7) is subjected to intramolecular [4 + 2] cycloaddition and oxidation reaction in the illumination and oxygen atmosphere of 300-385 nm, and rhododaurine B (8) and an epoxy epimer epinedodaurine B (9) are obtained; and carrying out protonation and rearrangement on the epidodaurine B (9) by virtue of acid catalysis cyclic ether, so as to generate the rhododaurine A (10). The method can overcome the defects that the content of rhododendron miscellaneous terpenoids Rhododaurines A-C in nature is extremely low, and large-scale extraction is difficult.

The invention belongs to the technical field of biomedical materials and regenerative medicine, and relates to collagen-based injectable fiber hydrogel as well as a preparation method and application thereof. According to the injectable fiber hydrogel, methacrylated collagen and dithiothreitol are subjected to a thiol-ene click reaction rapidly under the action of a photoinitiator through illumination, a primary cross-linked network is formed, and the injection and in-situ gel forming requirements are met; then under the conditions that the pH is 6.5-8.0 and the temperature is 30-39 DEG C, collagen molecules are self-assembled into a nanofiber structure, and a bionic network similar to a natural extracellular matrix is obtained. The hydrogel disclosed by the invention has the advantages of rapid gelation, structural biomimetic property and biological activity; residual sulfydryl endows the hydrogel with active oxygen scavenging capacity, so that oxidative stress can be relieved, and immune response can be regulated; the fibrotic structure promotes cell adhesion, migration and tissue regeneration.

The utility model relates to the technical field of beauty instruments, and particularly discloses skin care equipment which comprises a working head, the front end of the working head can be in contact with the skin, and the skin care equipment further comprises a radio frequency working module which comprises a plurality of electrodes and is used for outputting radio frequency current to the skin; the light working module comprises a light emitting device, and the light working module is used for emitting light rays with the wavelength ranging from 630 nm to 1940 nm; and the controller is electrically connected with the radio frequency working module and the optical working module and is used for outputting a control instruction for controlling the radio frequency working module and the optical working module to work simultaneously so as to perform light irradiation and radio frequency current action on the skin. Therefore, the controller outputs a control instruction for controlling the radio frequency working module and the optical working module to work simultaneously, so that the light irradiation and the radio frequency current effect can be carried out cooperatively. The synergistic effect can give play to the advantages of the two, and the skin care effect is enhanced.