89results about How to "Realize precise regulation" patented technology

The invention discloses a method for preparing a modified composite nanofiltration membrane by constructing a pure COFs intermediate layer, which mainly includes: preparing TpPa-1 by using Schiff base condensation, constructing a pure COFs intermediate layer on a porous base membrane by vacuum filtration, and then A composite nanofiltration membrane is obtained through interfacial polymerization, wherein the porous base membrane is a polymer porous membrane with a pore diameter of 0.1 μm. In the present invention, by controlling the concentration of the aqueous phase monomer and the organic phase monomer in the interfacial polymerization step and the drying time after the interfacial polymerization reaction ends, the internal pore moisture and piperazine of the formed composite nanofiltration membrane can be effectively controlled. Molecules, that is, the hydrophilicity and porosity of the polyethersulfone-based membrane surface are optimized by vacuum filtration of the hydrophilic COFs intermediate layer, thereby realizing precise regulation of the interfacial polymerization process. The polyamide separation layer prepared by this method is thin and dense, Under the lower operating pressure (0.2MPa), it has higher water flux and maintains excellent separation performance.

The invention discloses a donor-acceptor type fluorenyl nanometer grid material, a preparation method and application thereof. The nanometer grid material is of a square-ring-shaped rigid structure formed through alternative arrangement of fluorenyl ramification regarded as electron donor units and electron acceptor units. The preparation method comprises the following steps that a precursor with tertiary alcohol and aromatic nucleus terminal based hydrogen inhibitor dual binding sites is dissolved in organic solvent; at the room temperature, a catalyst is added, and stirring and reacting are conducted; and the reaction is conducted for 5 min-12 h, and products are obtained through chromatogram column separation. The donor-acceptor type fluorenyl nanometer grid material has the advantages that the compounding method is modularized, extensibility and stability of thermology, electrochemistry and photology are high; dependency of thin film solvent is reduced; large-area soluble processing is achieved; the size of apertures is accurately regulated and controlled; and accurate regulation an control of band gaps and energy level arrangement are achieved. The donor-acceptor type fluorenyl nanometer grid material has potential application prospects in the fields of photoelectric function materials of organic solar cells, storage and memory resistor, sensing, detecting and the like.

The invention discloses an arc welding seam forming accurate prediction method based on deep learning. The arc welding seam forming accurate prediction method comprises the steps that a correspondingwelding process is designed according to welding equipment, a welding material, a structural form and a welding method; designing a corresponding process experiment according to a welding process, andimplementing in batches; according to different combinations of welding equipment models, material marks, structural forms and welding methods, weld joint forming sub-databases are established respectively; constructing a deep neural network taking the process parameters as input and taking the weld joint forming size and the weld joint section profile as output, and training and evaluating the deep neural network by utilizing data of the sub-database to obtain a weld joint forming prediction model; and real-time technological parameters in the welding seam forming process are collected and input into the welding seam forming prediction model, the corresponding welding seam forming size and welding seam section contour are output, and accurate prediction of arc welding seam forming is achieved. According to the invention, accurate prediction of weld joint forming can be realized.

The invention discloses an SERS sensor for integrated detection of tumor protein and nucleic acid markers and a preparation method thereof. The SERS sensor comprises a silver nanorod array substrate and an SERS probe, wherein the surface of the silver nanorod array substrate is modified with a tetrahedral DNA structure; the tetrahedral DNA structure is formed by self-assembling six DNA single chains, and three DNA single chains are arranged on three edges of the tetrahedral DNA structure, are respectively connected with three capture chains and are used for respectively and specifically binding nucleic acid and a protein marker. The detection limits of the SERS sensor for detecting nucleic acid and protein respectively reach the Amol / L magnitude and the fg / mL magnitude; the integrated detection of various nucleic acid and protein biomarkers in complex environments such as serum can be realized. The sensor disclosed by the invention is simple to prepare, high in detection sensitivity and good in reliability, can realize high-sensitivity detection of biomarkers with extremely low abundance in the early stage of lung cancer, and has good universality for various tumor biomarkers.

The invention discloses an oil reservoir water injection self-adaptive deep global regulation device and a construction method. The regulation device comprises agent dissolution and storage equipment and agent injection equipment which is connected with the agent dissolution and storage equipment through a connection pipeline. The agent dissolution and storage equipment comprises a cleaning and unchoking agent dissolution tank, a plurality of regulation agent dissolution tanks, an agent liquid mixer, an agent storage tank and a main liquid intake pipe. The agent injection equipment comprises a main liquid delivery pipe, a plunger pump installed on the main liquid delivery pipe, a liquid distributor connected with a liquid outlet of the main liquid delivery pipe, and a plurality of liquid injection pipes. The construction method includes the following steps that firstly, a well area to be regulated is determined; secondly, the equipment is placed in position and connected through the pipeline; thirdly, water is injected, and a pressure drop curve is tested before regulation; fourthly, cleaning and unchoking are conducted before regulation; fifthly, oil reservoir water injection self-adaptive deep global regulation is conducted on a target stratum. The oil reservoir water injection self-adaptive deep global regulation device is reasonable in design, convenient to install and lay, easy and convenient to operate, good in use effect and capable of effectively improving water displacing oil work efficiency and crude oil recovery efficiency.

The invention provides flight photographing positioning equipment, a flight photographing positioning method and device, and a storage medium. The flight photographing positioning equipment comprises a camera mechanism, a material conveying piece, and a suction nozzle head, wherein the material conveying piece is opposite to the camera mechanism, and can move along a preset track; the suction nozzle head is arranged on the side of the material conveying piece facing the camera mechanism and moves with the material conveying piece, and positioning marks are arranged on a suction surface of the suction nozzle head; and the suction surface is located within a photographing range of the camera mechanism, the camera mechanism photographs the suction surface onto which a material is sucked, and the flight photographing positioning equipment determines the position of the material according to the positioning marks. The positioning marks are arranged on the suction surface of the flight photographing positioning equipment, and can be photographed during image photographing of the suction surface onto which the material is sucked, so that the flight photographing positioning equipment can carry out precise positioning on the material according to images. Therefore, the image photographing can be carried out on the material during high-speed material picking and placement; and although control precision requirements for exposure time of the camera mechanism are reduced and a wider delay range of the camera mechanism is allowed, the precise positioning of the material can still be achieved.

The invention discloses PEG (polyethylene glycol) functionalized biimidazole cation temperature control ion liquid as well as a preparation method and application thereof. According to the key points of the technical scheme, the PEG functionalized biimidazole cation temperature control ion liquid has a structure described in the specification, and in the structure, n is 7, 11, 15 or 21. The invention further discloses a preparation method of the PEG functionalized biimidazole cation temperature control ion liquid and application of the PEG functionalized biimidazole cation temperature control ion liquid to extraction and separation of amino acid or protein. The PEG functionalized biimidazole cation temperature control ion liquid can form a two-liquid system with an LCST (lower critical solution temperature) phase behavior together with water, and can form a two-liquid system with a UCST (upper critical solution temperature) phase behavior together with an alcohol compound; a proper amount of water is added into the two-phase system of the ion liquid and alcohol so as to accurately adjust and control the two-phase system from the UCST phase behavior to the LCST phase behavior.

The invention discloses a preparation method of a hard tissue engineering scaffold with a gene regulation function. The preparation method comprises the steps of adopting a method combining a sol-gel technology and an electro-spinning technology for preparing CaO-P2O5-SiO2 system mesoporous bioactive glass micro-nanofiber as an inorganic base phase; utilizing a gene recombination technology for preparing plasmid DNA (Deoxyribonucleic Acid) loaded with an osteocyte regulatory factor Osterix target gene, and using chitosan for embedding the plasmid DNA to prepare into a microballoon as an additive phase; preparing an emulsion system formed by the bioactive glass micro-nanofiber, the genetic vector microballoon, PCL and other materials, utilizing a thermally induced phase separation method for preparing a bioactive glass / PCL bionicbone tissue engineering scaffold compounding the Osterix plasmid DNA, and obtaining the hard tissue engineering scaffold with the gene regulation function. The hard tissue engineering scaffold can stimulate cells on a molecular level and produces a special response so as to realize accurate regulation on cell growth genes.

Provided is a method for preparing a catalyst used for modulating distribution of metal on a molecular sieve.By control over the blockage of molecular sieve ducts and the pH of solution, or by selection of metal complexes of appropriate sizes and adjustment of deposition-precipitation process parameters and the pH of solution, catalytic activity metal elements can be selectively deposited on specific loci of the outer surface of the molecular sieve or deposited on specific loci of the inner surface of the molecular sieve as a priority.

The invention discloses a micro-fluidic chip manufacturing method based on the nanofiber template method. Firstly, a receiving plate is coated with a photo-curing material layer to form a micro-fluidic chip substrate; secondly, near-field electrospinning or micro liquid spinning is conducted to obtain a first fiber layer with a certain pattern; thirdly, the receiving plate descends by a certain height along with a moving platform, orderly sedimentation of a second fiber layer is conducted, and spinning and curing are conducted layer by layer to obtain a photo-curing model combining orderly fibers with a photo-curing material; fourthly, a last fiber layer is communicated with the surface of the photo-curing model, and when the fibers are completely wrapped by the photo-curing material and certain allowance is reserved, forming of the photo-curing model is completed; fifthly, the photo-curing model is taken out and placed into a solvent, and ultrasonic shaking soluble fibers are added; sixthly, when micro-nanofibers are completely dissolved, the model is taken out to obtain a micro-fluidic chip. The soluble fibers serve as channel filler, and forming precision can reach the precision level same as that of the fiber diameter.

The invention discloses a speech synthesis method and system for new tone generation, and belongs to the field of speech synthesis. The method comprises the following steps of: firstly, extracting phoneme pronunciation duration and a Mel spectrum from a text and an audio as a training set, and learning a text coding representation aligned with the Mel spectrum in length; enabling a speaker tag to pass through an Embedding embedding layer to generate a speaker coding representation; and combining the speaker coding representation and the text coding representation, outputting a synthesized Mel frequency spectrum through a decoder, and synthesizing voice through a vocoder. According to the method, the speaker coding information is linearly combined to obtain diversified new speaker codes, so that the voice with new tone is synthesized. The period and the cost of recording a voice training database are saved, and the newly generated tone can be regulated and controlled; and the complexity of a model is reduced, so that the speech synthesis model added with the tone generation function can be arranged on hardware with low computing resources, and wide application of the model in more scenes is facilitated.

The invention relates to a method for regulating and controlling the stable flow of the liquid nitrogen jet flow state and belongs to the field of cryogenic engineering. According to regulation of the stable flow of the liquid nitrogen jet flow state through the method, a heat insulation pipeline is utilized to reduce heat leakage, the two-phase flow gas mass fraction is regulated and controlled within a certain range, the gasification ratio of liquid nitrogen in the delivering process is decreased, and the stable output result in the allowable range is obtained. The liquid nitrogen delivering flow is monitored in real time, and liquid nitrogen flow regulation and stable output are achieved through a PID regulating and control method. According to the method, cryogenic fluids in cryogenic medium processing are effectively stabilized, regulated and controlled, the dry degree of the liquid nitrogen in pipeline delivering is decreased, and the utilization rate of the fluids during liquid nitrogen ultra-low temperature cutting is increased. A liquid nitrogen delivering device is compact in structure, a vacuum pipeline is adopted, the heat loss in the pipeline is reduced, the liquid nitrogen gasification rate is decreased, the two-phase flow gas mass fraction is decreased, the liquid nitrogen jet flow state is stabilized, and the liquid nitrogen flow is accurately regulated and controlled.

The invention discloses an electrostatic atomizing cooling system for a high heat flux density surface. The system comprises a pipeline system, an electrostatic atomizing device and a controller, wherein the pipeline system is formed by connecting a liquid storing tank, a circulating pump and a heat exchanger through pipelines; the electrostatic atomizing device is that a micron pore array and a high pressure pore plate are mounted in a nozzle; an atomizing chamber is formed between the micron pore array and a nozzle housing; a flow rate controller and a voltage controller are arranged in thecontroller; the circulating pump is used for pumping cooling liquid from the liquid storing tank, and the cooling liquid injected through the electrostatic atomizing device is collected to a bottom plate below an atomizing system, and the bottom plate is connected to a heat exchanger through a liquid returning pipe and is led to the liquid storing tank; a temperature controller for measuring the temperature of a cooled object is mounted on the bottom plate. According to the system, the rotating speed of a circulating pump is controlled, and the flow rate is changed to adapt to the cooling of the high heat flux density base surface; the voltage and the atomizing flow rate can be accurately adjusted based on the temperature; and moreover, a circulating pipeline system is arranged, so that the problems that the atomizing speed and the atomizing capacity are hard to adjust and the cooling liquid cannot be recycled by an existing atomizing cooling device can be solved.

The invention belongs to the technical field of ecological environment construction methods, and particularly relates to an intelligent construction method for an ecological environment of strawberryand bee composite facilities, which comprises the following steps of S1, determining a strawberry suitable growth environment: collecting environment influence factor data by means of a temperature sensor, a humidity sensor, a photosensitive sensor and a CO2 gas sensor. According to the intelligent construction method for an ecological environment of a strawberry and bee composite facility, a modern control technology is adooted to carry out data fusion on growth conditions of the strawberries and honeybee pollination conditions; accurate environment regulation and control in different time periods are achieved; the growth and development of different organisms are met; a composite ecological space where different organisms harmoniously coexist is constructed, an intelligent equipment technology and a facility agriculture cultivation technology are organically fused, and construction and application of the composite ecological space with different organism space-time distribution differences, optimization and measurement of composite ecological environment index parameters, and artificial induction and application of pollination behaviors of bees in a facility environment are achieved.

The invention discloses a method and system for accurately regulating and controlling the state of a nonvolatile memory unit and belongs to the technical field of semiconductor storage, and the methodcomprises the steps: (1) determining a target threshold voltage range [Vmin, Vmax] according to a target data state; (2) reading the threshold voltage Vread of a storage unit; if the Vread belongs to[Vmin, Vmax], indicating that state regulation is successful, and concluding operation; if Vread is greater than Vmax, entering the step (3); if Vread is smaller than Vmin, executing the step (5); (3) executing erasing operation on the storage unit, and turning to the step (4); (4) reading the threshold voltage Vread 2 of the storage unit; if Vread 2 is larger than Vmin, indicating that state regulation fails, and concluding operation; otherwise, turning to the step (2); (5) applying programming pulses to the storage unit, adjusting the programming pulses in the mode that the width and the amplitude are gradually increased till the threshold voltage of the storage unit is larger than or equal to the lower bound Vmin of the target threshold voltage range, and then exuecting the step (2). According to the invention, the state of the nonvolatile memory unit can be accurately regulated and controlled.

The invention discloses a 3D (three-dimensional) microwave resonant cavity. The 3D microwave resonant cavity comprises a cavity body, a circuit board, an input port and an output port. The cavity body is rectangular and comprises a shell and a hollow cavity provided in the shell. The input port (3) and the output port penetrate the shell from the upper portion of the cavity body (1) and are communicated with the shell. One side of the cavity is provided with a narrow slot along extension direction of the cavity and facing the cavity. The circuit board comprises an external connecting part (2a) and an internal insert part; the external connecting part is wider, the internal insert part is narrower and elongated, and the internal insert part is inserted into the hollow cavity through the narrow slot. The internal insert part comprises a metal lead extending along an insertion direction, a quantum bit device mounting position located at the tail end of the internal insert part and an equipotential connecting line which connects the metal lead and the quantum bit device mounting position. The 3D microwave resonant cavity allows better coupling and allows quantum bit to be precisely controlled.

The invention discloses a polarization regulation device and method and a laser interference type structured light illumination microscope system. The disclosed polarization regulation device comprises two Pockels cells or two liquid crystal phase delayers, incident light passes the first and second Pockels cells or the first and second liquid crystal phase delayers in order, and the two Pockels cells or two liquid crystal phase delayers are used to regulate the polarization state of the incident light. In the laser interference type structured light illumination microscope system, output light, of incident light polarized light (including diffracted light in 0 level and + / -1 level) in different direction angles, after passing the polarization regulation device if of linear polarization inparallel with the polarization direction, it can be ensured that two or three interference light beams in a focal plane after input to an object lens of a large aperture are of s polarization, and anoptimal structured light modulation degree is obtained.

The invention relates to a system for dropping natural gas with hydrogen and belongs to the technical field of energy. The system comprises a natural gas pipeline, a natural gas flow meter, a buffer tank, a hydrogen storage tank, a hydrogen flow controller, a hydrogen flow meter and a control module, wherein the natural gas flow meter and the hydrogen flow meter are used for monitoring the natural gas flow in the natural gas pipeline and the hydrogen flow in the hydrogen pipeline in real time, the control module controls the opening degree of a valve in the hydrogen flow controller according to monitoring results of the natural gas flow meter and the hydrogen flow meter and the target proportion of the hydrogen doping ratio, so that the hydrogen flow in the hydrogen pipeline is adjusted, and it is ensured that the hydrogen doping ratio of natural gas is within a target range. The system is simple in structure and high in safety, the natural gas and the hydrogen can be effectively mixed, the fluctuation range of the hydrogen doping ratio of the natural gas is small, and the system has good good application prospects.

The invention relates to the field of controllable preparation of a carbon nano-tube vertical array structure with heterojunction, and in particular relates to a controllable preparation method of a carbon nano-tube vertical array structure with heterojunction carbon (nitrogen doped / undoped). The heterojunction also means a molecular inner segment, which is formed by two different types of carbon nano-tubes, namely nitrogen doped and undoped carbon nano-tubes on the junction. Iron deposited on a Si substrate or SiOX / Si substrate is used as a catalyst, a chemical vapor deposition method is utilized, and a nitrogen source is added in good time in a carbon nano-tube vertical array growing process to prepare a nitrogen doped / undoped carbon nano-tube heterojunction vertical array, and the length, number, structure and the like of the heterojunction can be effectively and accurately controlled. The controllable preparation method of the heterojunction vertical array structure provided by the invention is simple, has a remarkable heterojunction structure, a narrow heterojunction transition area and an uniform structure, and is expected to be applied to the fields of diodes, nano-switches, amplifiers and the like.

The invention relates to a vanadium dioxide composite film and a preparation method thereof. The vanadium dioxide composite film comprises a base plate as well as a first protective transmission enhanced layer, a vanadium dioxide light-dimming layer and a second protective transmission enhanced layer which are sequentially formed on the surface of the base plate, wherein a chemical formula of thefirst protective transmission enhanced layer or / and the second protective transmission enhanced layer is WO3-x(x being greater than 0 and smaller than 0.9) or MyWO3 (y being greater than 0 and smallerthan or equal to 1), and M is at least one of Cs, Rb, K, Na, Li, Be, Mg, Ca, Sr and Ba. The vanadium dioxide composite film selects WO3-x or MyWO3 as the first protective transmission enhanced layerand the second protective transmission enhanced layer at the two sides of vanadium dioxide light-dimming layer. An optical constant n of WO3-x or MyWO3 is matched with that of the vanadium dioxide composite film, and n is equal to 2.0-2.4. The vanadium dioxide composite film can achieve optical design light-dimming.

The invention discloses a morchella esculenta industrial culture method. According to the four-stage morchella esculenta industrial culture method, after studying the biological characteristics, environmental culture conditions, nutrient requirements and growth laws of the morchella esculenta, the industrial control stages of the system of morchella esculenta can be groped, and by controlling setdifferent parameters of the four set culture stages, accurate control of the industrialized production of the morchella esculenta can be realized, so that the cultivation management of the morchella esculenta enters a parameterization control layer, the yield and the stability of the fruiting are guaranteed, and industrial annual production of the morchella esculenta is realized.

The invention belongs to the technical field of biosensors, and particularly relates to a lactic acid biosensor which comprises a substrate, a carbon working electrode, a carbon counter electrode, a reference electrode and a lactic acid sensing film, wherein the carbon working electrode is an aminated graphite printing electrode, the lactic acid sensing film is formed on the surface of the carbon working electrode after lactic acid oxidase for establishing an electron transfer network is chemically crosslinked by a difunctional chemical crosslinking agent, and the lactic acid oxidase for establishing the electron transfer network is prepared by modifying electrochemically activated lactic acid oxidase by a carboxylated nano material. The electrochemical activation technology of the lactate oxidase is adopted, so that the lactate oxidase can perform direct electron exchange with the electrode, the sensitivity, accuracy, reproducibility, stability, specificity and anti-interference capability of dynamic detection of lactic acid can be improved, the service life of the implantable continuous lactic acid monitoring system is prolonged, and meanwhile, the cost of the lactic acid biosensor is greatly reduced.

The invention discloses a welding device and method for preventing welding angular distortion. The device mainly comprises a welding platform, a guide rail, a heating device, a control box, a feedback panel, a welding mask, a controller and soldering pliers. The control box is electrically connected with the heating device, the feedback panel, the controller and the soldering pliers. The heating device is installed on the guide rail. The guide rail is located below a welding post. The feedback panel is installed on the welding mask. The controller is arranged in a belt shape and installed on the soldering pliers. The method mainly includes the following steps that welding parts are fixed to the welding platform; the controller on the soldering pliers is adjusted, the heating device arrives at the position below a welding point, and the feedback panel displays positional information of the heating device in real time; a first microcontroller and a second microcontroller drive a first magnetic stripe and a second magnetic stripe to generate corresponding magnetic fields, and thus the end face of a heating tip can heat the back face of the welding point; and the welding point is welded. The welding device is simple in structure, convenient to use, high in working efficiency and low in production cost.

The invention provides a method for preparing a low-pressure high-selectivity nanofiltration membrane. According to the method, a small amount of amantadine is put into an oil-phase solution, the amantadine joins in an interface polymerization process in a mode of reacting with a part of acyl chloride groups in trimesoyl chloride in advance, and thus the amantadine is successfully introduced intopolyamide. Due to the amantadine which is uniformly dispersed into a polyamide layer and is of a special cage structure, the free volume of a polymer chain can be increased; in addition, as the amantadine selectively passes through magnesium ions and sodium ions, the cross-linking structure of the generated polyamide and corresponding membrane properties are remarkably affected, and the membrane has wide application prospects in fields such as industrial wastewater zero omission and organic small molecule grade concentration.

The invention discloses a control method for forming a vertically-oriented assembly structure of a segmented copolymer. The segmented copolymer comprises multiple polystyrene-b-polymethacrylate (PS-b-PMA) different in molecular weight and segment proportion. The control method for vertical orientation includes evenly spreading a PS-b-PMA film on a substrate, subjected to electron beam radiation, with a low-electroconductivity or insulated surface and performing heating and annealing to obtain the segmented copolymer. The control method for vertical orientation of the PS-b-PMA has the advantages that novelty is high, operation process is simple, personalized patterns can be formed, interface regulation and control layers are not needed and macroscopic large-area morphology and microcosmic small-area morphology can be regulated and controlled accurately.

The invention relates to a control tooling and method for a spinning deformation temperature field of a large-sized high rare earth magnesium alloy barrel-shaped piece. Aiming to structural characteristics and material characteristics of the high rare earth magnesium alloy barrel-shaped spinning piece, the adjusting and control tooling special for uniformity of the spinning deformation temperaturefield is designed, design of a structure with a spinning die provided with a center hole, a hollow annular steel frame provided with a heating pipe, a pressing bolt and a tail top is adopted, so thata deformation zone of a high rare earth magnesium alloy barrel billet obtains the bidirectional heating effect in the whole spinning deformation process, so that the uniformity of the temperature field of the deformation zone of the high rare earth magnesium alloy barrel billet in the whole spinning process is realized, the temperature gradient of the inner wall and the outer wall of the deformation zone of the high rare earth magnesium alloy barrel billet is reduced or eliminated, spinning cracks are avoided, and the forming quality and precision of the large-sized high rare earth magnesiumalloy barrel-shaped spinning piece is ensured. The control tooling for the spinning deformation temperature field of the large-sized high rare earth magnesium alloy barrel-shaped piece is simple and efficient in operation process, suitable for batch processing, and has high operability and practicability.

The invention relates to a vector light field regulation and control optical fiber based on a nanometer grating array. In the optical fiber, a femtosecond laser direct writing technology is used to implant the nanometer grating array in an internal portion; and through specific array configuration, unique corresponding vector mode of light is selected to pass through. If grating surface distribution of the nanometer grating array is a radiation type, a radial polarization vector light field can be correspondingly regulated, controlled and output, which is a TM01 model. If grating surface distribution of the nanometer grating array is an annular type, an angular polarization vector light field can be correspondingly regulated, controlled and output, which is a TE01 model. If grating surfacedistribution of the nanometer grating array is a staggered type, a mixed polarization vector light field can be correspondingly regulated, controlled and output, which is an HE21<o / e> model. And then, vector light field regulation and control in a broadband range can be realized. The structure of the vector light field regulation and control optical fiber is simple, one-time molding is realized,stability is high, and a wide application prospect is possessed in important fields of optical fiber communication, an optical integration, material processing, optical tweezers and the like.

The invention discloses a preparation method and an application of a PdGaX / Ga2O3 catalyst used for selective hydrogenation of acetylene, and belongs to the technical field of gas phase catalysis withsupported catalyst. The method includes: performing hydrothermal synthesis to prepare a gallium oxide supporter and performing impregnation to support palladium particles onto the gallium oxide supporter, wherein by regulating pretreatment temperature of hydrogen, the permeating doping of gallium atoms in the supporter into the palladium nanoparticles is achieved; then performing reaction performance test of selective hydrogenation of acetylene. A result proves that the Pd2Ga structure, formed in the hydrogen pretreatment, has excellent reaction activity and ethylene selectivity. The syntheticmethod can achieve controllable regulation on the nanoparticles by means of the pretreatment temperature and atmosphere. The catalyst has simple preparation process and excellent performance.

The invention discloses an Ag / TiS2 layered composite substrate with SPR having strong SERS activity in near infrared and a preparation method of the Ag / TiS2 layered composite substrate, and belongs tothe technical field of composite nano functional materials. The invention aims to improve the surface enhanced Raman scattering activity of TiS2 and obtain the substrate with higher Raman activity; the composite substrate provided by the invention is made of a composite material of Ag and TiS2; the composite structure is obtained by depositing Ag and TiS2 on polystyrene spheres of a 200 nm hexagonal close-packed array in a layered sputtering mode. The thickness of Ag is 10 nm, the thickness of TiS2 is 2-10 nm, the substrate has the adjustable SPR characteristic in the infrared region, and accurate regulation and control of SPR can be achieved by changing the thickness of TiS2.

The invention provides a metasurface unit, a phase-adjustable metasurface with the metasurface unit and an optical system, and belongs to the technical field of metasurfaces. The metasurface unit provided by the embodiment of the invention comprises an electrode layer, an electric actuating layer and a nano structure, wherein the nano structure is a sub-wavelength structure; the electrode layers are arranged at the two ends of the electric actuating layer; the nano structure is arranged on one side, far away from the electric actuating layer, of the electrode layer; the nano structure is arranged on one side, far away from the electric actuating layer, of the electrode layer; and the electric actuating layer moves along the height axis direction of the nanostructure under the action of an electric field provided by the electrode layer. According to the metasurface unit, the phase-adjustable metasurface with the metasurface unit and the optical system provided by the embodiment of the invention, large-range and accurate phase adjustment of the phase-adjustable metasurface is realized through the electric actuating layer.