173 results about "Solar spectra" patented technology

The invention relates to the technical field of high polymer materials, in particular to a high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material as well as a preparation method and application thereof. Firstly, a polypyrrole aqueous solution is prepared through chemical oxidative polymerization, and high-entropy alloy nanoparticles are synthesized through a Joule thermal technology; and then mixing a polypyrrole aqueous solution, the high-entropy alloy nanoparticles and a polyvinyl alcohol aqueous solution, and adding a cross-linking agent and a catalyst to prepare the high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material. According to the composite hydrogel, under the synergistic effect of the high-entropy alloy, the light absorption performance is remarkably improved, wide-spectrum efficient absorption of ultraviolet rays, visible light and near-infrared light in a solar spectrum is achieved, and meanwhile the mechanical strength and chemical stability of the material are enhanced. The preparation process is simple, the cost is low, and the prepared composite hydrogel has wide application prospects in the fields of seawater desalination, wastewater treatment and the like as a solar interface evaporator.

The invention provides a multifunctional passive cooling optical metamaterial fiber, yarn and fabric and a preparation method thereof. The passive cooling optical metamaterial fiber is composed of high-refractive-index inorganic micro-nano particles and / or a micro-nano functional material and a polymer substrate material. Wherein wavelength / sub-wavelength scale micro-nano particles are uniformly distributed in a substrate material as a random scattering medium to form a random optical metamaterial system, and reflection enhancement of the optical metamaterial fabric in a solar spectrum band is realized by utilizing a multiple Mie resonance collective effect. According to the passive cooling optical metamaterial fiber, a circular structure, a skin-core structure and the like are prepared through melt spinning, high-refractive-index inorganic micro-nano particles are added into a skin layer and used for sunlight band wide spectrum regulation and control, and a micro-nano functional material is added into a core layer, so that multiple functions are effectively achieved.

The invention discloses a Janus cotton fabric with radiation refrigeration and antibacterial functions and a preparation method thereof.The preparation method creatively achieves multifunctional integration through multistage structural design and interface engineering and specifically comprises the steps that 1, a bionic silicon dioxide nano sheath layer grows on the surface of cotton fiber in situ through a controllable sol-gel method; the monodispersity of the nanoparticles is ensured by optimizing the ratio of the TEOS to the silane coupling agent; (2) introducing high-refractive-index nanoparticles to construct a dual-scale photonic crystal structure, and enhancing solar spectrum reflection by using a plasma resonance effect; (3) performing hydrophilic interface modification by adopting a biomacromolecule self-assembly technology to form a super-hydrophilic antibacterial layer; and (4) constructing a super-hydrophobic interface on the single side of the fabric through precise spraying, and finally forming a Janus structure with an asymmetric wetting gradient. The preparation process is mild in condition and high in controllability, and the obtained Janus fabric has excellent antibacterial performance (the antibacterial rate gt; 99.5%) and radiation refrigeration performance (daytime sub-environment temperature drop gt; 8 DEG C).

The invention provides a solar seawater desalination photothermal conversion efficiency optimization method and system based on machine learning, and the method comprises the steps: firstly collecting the solar spectrum distribution data, seawater turbidity spectrum data, real-time heat flow data and semiconductor nanomaterial data of a target sea area; and constructing a material spectrum mapping library based on the light absorption characteristics of the nano material. Through coupling analysis of a solar spectrum and a seawater turbidity spectrum, an environmental constraint condition is formed, a Bayesian optimization model is combined with a material spectrum mapping library and real-time heat flow data, and an optimal nano material mixing ratio is generated under environmental constraint. Then, the interface evaporation rate is predicted through the deep residual network, an optimal material morphology configuration scheme is obtained, and finally the morphology configuration is applied to semiconductor nanomaterial preparation. The photo-thermal conversion efficiency of the solar desalination system in the high-turbidity seawater environment is improved.

The invention belongs to the field of composite materials, and particularly relates to a nanofiber radiation refrigeration heat insulation film with a bionic multilayer structure. The device sequentially comprises a bionic anti-reflection layer, a solar spectrum reflection layer, a nanofiber porous heat insulation layer and an atmospheric window radiation layer from outside to inside, the bionic anti-reflection layer is a sub-wavelength nano bulge array simulating a moth eye structure and is formed on the outer surface of the solar spectrum reflecting layer; the solar spectrum reflecting layer is a polymer film doped with high-reflectivity nanoparticles; the nanofiber porous heat insulation layer is a porous membrane formed by interweaving polymer nanofibers prepared by an electrostatic spinning technology; the atmospheric window radiation layer is a functional layer formed by coating or blending high-emissivity inorganic nanoparticles on the inner surface of the nanofiber porous heat insulation layer; the film integrates bionic antireflection, high sunlight reflection, efficient heat radiation and physical heat insulation, and efficient, stable and flexible daytime radiation refrigeration is achieved.

The invention provides a radiation refrigeration plate combining a sky radiation refrigeration material and a plate heat exchanger, and relates to the technical field of refrigeration, the radiation refrigeration plate comprises a sky radiation refrigeration material layer, a plate heat exchanger assembly, a fan cover layer and a heat insulation material layer, the sky radiation refrigeration material layer has high reflectivity in a solar spectrum wave band and has high emissivity in an atmospheric window wave band, and the plate heat exchanger assembly has high reflectivity in a heat insulation material layer; and heat can be efficiently radiated to the outer space. The plate heat exchanger assembly comprises an enhanced heat exchange tube and a nanofluid, and the nanofluid is filled in the enhanced heat exchange tube and used for heat transfer and transport capacity and enhancing the heat exchange effect. And the fan cover covers the sky radiation refrigeration material. The heat insulation material layer is laid on the portion, except the top face, of the radiation refrigeration plate so as to reduce heat loss of the system to the surrounding environment, and the refrigeration effect is guaranteed. By means of the structure, working modes in the daytime and at night are achieved, the heat transfer efficiency of the system is greatly improved, energy consumption is reduced, and the efficient radiation refrigeration effect of all-weather continuous operation at the temperature lower than the environment temperature is achieved.

The invention provides an electro / thermochemical gradient hydrogen production system and method for solar radiation energy grading and residual light energy thermal complementary coupling. The system comprises a light condensation assembly; the frequency division assembly is used for grading solar spectrum radiation; a photovoltaic cell power generation device; the methane oxygen-enriched combustion high-temperature photovoltaic power generation device is used for realizing oxygen-enriched combustion of natural gas by utilizing residual heat heat energy and generating power by utilizing radiation energy generated by high-temperature flue gas generated after combustion; the solid oxide electrolytic tank device is used for pushing solid oxide to electrolyze water to produce hydrogen by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step; and the thermal chemical reaction device is used for promoting each step of thermal chemical reaction by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step. The energy source of the system is solar radiation and natural gas, hydrogen and electricity are produced, the system utilizes different energy conversion modes to achieve temperature gradient ordered conversion and utilization of residual light energy after solar frequency division, and complementary coupling of different qualities is achieved on the basis of energy gradient conversion.

The invention relates to the technical field of photovoltaic cooling hydrogen production, and particularly provides a multi-source synergistic spray cooling concentrating frequency division photovoltaic hydrogen production system and a regulation and control method. Accurate separation of solar spectrums is achieved through jacketed pipe frequency division and a reaction pipe, visible light wave bands are converted into electric energy through a photovoltaic module, infrared wave bands are subjected to photo-thermal conversion through a catalytic reaction pipe, surplus heat energy is directly used for the activation process of hydrogen production through water electrolysis, and gradient utilization of solar energy is achieved. And precise temperature control is realized, and the temperature of the photovoltaic panel is stabilized in an optimal interval in combination with a closed-loop temperature control strategy. The wind-solar complementary power supply and the waste heat cascade recovery device synergistically improve the energy utilization rate, and the multifunctional integrated electric control system realizes hydrogen-electricity-heat multi-target scheduling through a dynamic game optimization algorithm and a digital twin simulation platform. The working temperature of a solar cell is stabilized in the optimal efficiency interval, meanwhile, heat energy loss of a traditional system is converted into hydrogen production effective energy, and an efficient and stable solar energy-hydrogen energy conversion system is constructed.

The invention discloses a silicon-based infrared diaphragm with a photothermal effect inhibition effect. The silicon-based infrared diaphragm is a photon super-structure film formed by alternately stacking heterogeneous photonic crystal film layers with relatively small infrared band extinction coefficients. Therefore, the reflection bandwidth is widened through mutual coupling of a plurality of functional film sequences, impedance matching and interlayer coupling are adjusted, and the infrared antireflection effect is improved. The silicon-based infrared diaphragm provided by the invention has the characteristic of high reflection of solar spectrum (280-2500 nm), can reject heat absorption in a working environment with high solar radiation in the daytime, and reduces the thermal load of a photoelectric device, so that the device can work in a stable temperature environment. Meanwhile, the high infrared transmittance is kept, the photoelectric property of the silicon wafer in the infrared band (2.5-14 microns) is not affected, and compared with a bare silicon wafer, the performance is improved.

The invention discloses a solar spectrum simulation method based on a BP neural network, belongs to the technical field of solar spectrum simulation, and aims to solve the problem that no LED solar simulator can simulate AM0G and AM1.5 G solar spectrums at the same time. The method comprises the steps of an LED solar spectrum simulation framework giving consideration to AM0G and AM1.5 G, an NSGA-II-assisted solar spectrum LSTM simulation algorithm, a solar spectrum simulation instance, conclusion analysis and the like. According to the method, the spectrum matching degrees of the AM0G and the AM1.5 G are superior to + / -10.5% and + / -9.3% respectively, the simulation effect of A +-level solar spectrum simulation giving consideration to the AM0G and the AM1.5 G is achieved, and the method has the advantages of being high in practicability and wide in application range. And theoretical basis and technical support are provided for high-precision solar spectrum reconstruction.

The invention discloses a TEC photo-thermal stable thermoelectric power generation device and a preparation method thereof, and relates to the technical field of thermal power generation, and the TEC photo-thermal stable thermoelectric power generation device comprises an energy capture module, a thermoelectric power generation module and a dual-mode heat dissipation module which are sequentially arranged from top to bottom; the energy capture module comprises a silicon substrate with a micro-cone array on the surface, a phase change energy storage buffer dielectric layer coated on the surface of the micro-cone array, and a silicon carbide film layer, a titanium nitride film layer and a titanium nitride nanoparticle layer which are sequentially arranged on the surface of the phase change energy storage buffer dielectric layer; the thermoelectric power generation module comprises a corrugated metal composite substrate and a plurality of thermoelectric units arranged on the surface of the metal composite substrate. The bottleneck that a traditional single material is insufficient in solar spectrum coverage is broken through, the solar energy utilization efficiency is greatly improved, excessive heat generated by sudden change of instantaneous illumination intensity can be effectively absorbed, and continuous and stable heat source input is provided for thermoelectric conversion.

The invention discloses an on-orbit spectrum precision test method and equipment for an ultraviolet hyperspectral remote sensor, and the method comprises the steps: selecting a high-resolution reference solar spectrum higher than the spectral resolution of the ultraviolet hyperspectral remote sensor, and calculating a reference standard solar spectrum according to the high-resolution reference solar spectrum; establishing a reference wavelength library according to the reference standard solar spectrum of the ultraviolet band, and selecting a standard absorption line meeting conditions as a reference wavelength; screening an absorption peak center position of the observation spectrum, finding an absorption peak center closest to the reference wavelength in combination with the reference wavelength library, and constructing a peak searching database of the absorption peak center of the discrete spectrum; and calculating a difference value between the central wavelength calculated according to the peak searching database and the corresponding reference wavelength to obtain the spectrum calibration precision of the ultraviolet hyperspectral remote sensor. According to the method, the precision difference of the spatial dimension can be identified, the distribution of the overall system deviation is quantified, and reliable support is provided for on-orbit precision verification and performance optimization of the ultraviolet hyperspectral remote sensor.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The invention relates to a design and preparation method of selective spectral transmission agricultural photovoltaic glass, and belongs to the field of photovoltaic agricultural cross technologies. The agricultural photovoltaic glass is synergistically designed through multiple layers of functional structures and comprises a selective spectrum transmission layer, a bottom diffuse scattering layer and an edge photovoltaic unit. The selective spectrum transmission layer is formed by compositing a photoluminescence substance layer and a glass layer, incident ultraviolet light (300-400 nm) can be converted into red light (620-680 nm), the number of parts beneficial to crop growth in transmission light is increased, selective transmission of incident solar spectrums is achieved, and full transmission of visible light (400-700 nm) and infrared light (700-1000 nm) is guaranteed while ultraviolet light is isolated. The photovoltaic unit is arranged along the edge of the glass, and utilizes the optical waveguide total reflection principle to efficiently collect ultraviolet converted light for power generation. The problems that traditional photovoltaic glass is low in light transmittance and spectral absorption conflicts with plant requirements are solved, and synergistic interaction of greenhouse light transmittance, crop growth and clean power generation is achieved.

The invention is applicable to the technical field of sunlight utilization and wastewater treatment, and provides a preparation method and application of a photo-thermal-photocatalytic solar interface evaporator. According to the method, alkalized polyacrylonitrile aerogel is used as a matrix framework, BiOI-Bi-Bi2O3 composite particles are used as main photo-thermal-photocatalytic functional materials, and the photo-thermal-photocatalytic solar interface evaporator is prepared. And the single layer of Ti < 3 > C < 2 > T < x > MXene is used as a synergistic photo-thermal and photo-photocatalytic auxiliary agent. According to the prepared composite aerogel, BiOI, Bi2O3 and Bi are combined to form a stable interface heterostructure, and meanwhile, full-wave-band efficient utilization of a solar spectrum is realized by utilizing single-layer Ti < 3 > C < 2 > T < x > MXene. The evaporator can be used for effectively treating a water source containing complex pollutants and synchronously realizing desalination and deep purification. The evaporator has remarkable effects in the aspects of improving the photo-thermal conversion efficiency, optimizing the evaporation process and the resource utilization rate, protecting the environment, saving energy and the like, and has wide application prospects in the aspects of water resource shortage and water environment pollution.

The invention discloses a photovoltaic power generation forecasting method based on spectrum forecasting, and aims at solving the problem that errors are large due to the fact that only temperature and total irradiance are considered in an existing photovoltaic power generation forecasting method. The method comprises the following steps: downloading global forecast data and carrying out lattice point coding conversion; then carrying out dynamic downscaling and calculating future key meteorological variables; calculating the spectral optical thickness of each atmospheric component by using the spectral absorption and scattering coefficients of different gas components in the HITRAN database, and obtaining direct and scattered spectral irradiance according to the spectral optical thickness; carrying out calculation result verification and artificial intelligence correction by utilizing a solar spectrum radiometer; calculating generated power of different wavelengths; and calculating the final generation power through integral calculation in combination with the loss of other parts of the photovoltaic module. And forecasting a radiation spectrum at a future moment according to different forecasted meteorological variables, and converting radiation into power generation power according to the spectrum, thereby realizing refined conversion of optical power.

The embodiment of the invention provides a remote sensing image atmospheric correction method and system for an ocean near-shore scene, and relates to the technical field of ocean remote sensing image atmospheric correction. According to the method, after remote sensing data is obtained, solar flare correction is executed by extracting a target mask and using a secondary simulation model of a satellite signal in a solar spectrum. And then a multi-band darkness index is calculated, and an optimal aerosol optical thickness value is inverted through a radiation transmission model. And calculating the atmospheric correction coefficient of each wave band according to the optimal aerosol optical thickness value so as to generate correction result data. According to the method, on the basis of robust flare correction of the SWIR proxy, scene-adaptive flare proxy is constructed by utilizing water body reflection and path radiation physical characteristics of the SWIR under a deepwater condition, and flare deduction is realized. Inversion is carried out through multiband combined darkness indexes, and the spectral characteristics of the deep water body reflected in the visible spectrum are utilized, so that single-band random noise is smoothed, and the accuracy of an AOT estimation result is improved.

The invention provides a solar photovoltaic system, and belongs to the technical field of photovoltaics. The system comprises a light condensation module which is used for self-adaptively focusing according to the illumination condition and splitting light; the wide-spectrum absorption photovoltaic module is used for receiving the light transmitted by the condensation module and optimizing spectrum absorption; the intelligent control system is used for generating an optimal strategy through a preset fusion model according to the collected various aspects of data of the solar photovoltaic system, and sending a control instruction according to the optimal strategy; the storage battery module is used for storing electric energy from the wide-spectrum absorption photovoltaic module; and the electric energy output and adaptation module is used for receiving the electric energy of the storage battery module. According to the invention, the absorption range of the solar spectrum is widened; the optimal control strategy can be accurately generated in real time, and the whole solar photovoltaic system can quickly adapt to complex working conditions and always keep an efficient and stable operation state through cooperative regulation and control of all the modules.

The present disclosure provides a film for enhancing the growth of plants in the Cannabaceae family, the film being capable of blocking solar spectrum in the range 430-550 nm. The present disclosure also provides a single- or multi-layer plastic greenhouse film for enhancing cannabis plant growth, where the single- or multi-layer plastic greenhouse film (a) has at least one blue light blocking layer for blocking solar spectrum in the range of 430-500 nm; (b) has a high transmittance for red light in the solar spectrum in the range of 600-750 nm.

The invention provides an under-forest light spot space-time distribution simulation method and system based on anisotropic probability volume fraction, and the method comprises the steps: obtaining laser radar point cloud data of a target forest stand, and carrying out the preprocessing, and generating a standardized point cloud; constructing a forest probability density field: dividing a forest stand space into voxel grids, and for each non-empty voxel containing vegetation, extracting spatial distribution statistical characteristics of internal point clouds of the non-empty voxel and calculating an anisotropic extinction coefficient of each non-empty voxel; the method comprises the following steps: simulating the sun as a surface light source with a preset angular diameter, emitting light from an under-forest preset observation point to the surface light source, executing probability volume fraction light stepping in a forest probability density field, and obtaining the optical thickness by accumulating anisotropic extinction coefficients of all non-empty voxels on a light propagation path. And then calculating the transmittance of the light reaching the observation point, integrating the solar spectrum irradiance in a wave band and a time period corresponding to the photosynthetically active radiation, and generating a spatial-temporal distribution map of the photosynthetically active radiation under the forest.

This application provides a machine learning-based method and system for optimizing the photothermal conversion efficiency of solar desalination in seawater. The method includes: firstly, collecting solar spectral distribution data, seawater turbidity spectral data, real-time heat flow data, and semiconductor nanomaterial data for the target sea area; and constructing a material spectral mapping library based on the light absorption characteristics of the nanomaterials. By coupling analysis of the solar spectrum and seawater turbidity spectrum to form environmental constraints, a Bayesian optimization model is used in conjunction with the material spectral mapping library and real-time heat flow data to generate the optimal nanomaterial mixing ratio under these constraints. Subsequently, a deep residual network is used to predict the interfacial evaporation rate and obtain the optimal material morphology configuration scheme, which is finally applied to the preparation of semiconductor nanomaterials. This application improves the photothermal conversion efficiency of solar desalination systems in high-turbidity seawater environments.

The application provides a high-thermal-conductivity heat dissipation integrated composite heat control film for satellites, which comprises a protective layer, a nano heat control film and a graphite film. The nano heat control film comprises a protective layer based on the surface of the film and a three-dimensional micro-nano structure, the graphite film is packaged by hot melt adhesive and is pasted together with the nano heat control film by the hot melt adhesive to form a new high-thermal-conductivity heat dissipation integrated composite heat control film. The application is pasted on the outer surface of a satellite cabin plate or an antenna and the like by silicone rubber, so that the outer surface of the satellite has the characteristics of high reflectivity to the solar spectrum, high emissivity to the infrared spectrum and high thermal conductivity, the uniformity of the temperature field of the whole satellite is improved, the reliability of the single machine in the cabin is improved, the production cycle of the product is short and the product is convenient to implement. The application solves the problems of high heat flux density, complex illumination components and rapid development of future low-orbit satellite constellations, the production cost is significantly reduced, and the commercial batch production of the satellite constellations is facilitated.

The invention provides a solar energy comprehensive utilization coupling structure and a preparation method and application thereof. The solar energy comprehensive utilization coupling structure comprises a semitransparent photovoltaic cell, a photo-thermal reflecting mirror, a spectrum frequency divider, a non-transparent photovoltaic cell and a photo-thermal heat collector, and the semitransparent photovoltaic cell absorbs ultraviolet light and visible light in a solar spectrum; the photo-thermal reflecting mirror is located below the semitransparent photovoltaic cell and reflects the residual spectrum which is not absorbed by the semitransparent photovoltaic cell, the spectrum frequency divider divides near-infrared light and far-infrared light in the residual spectrum to the opaque photovoltaic cell and the photo-thermal heat collector respectively, and the opaque photovoltaic cell conducts photovoltaic power generation through the near-infrared light. And the photo-thermal heat collector utilizes far infrared light to carry out photo-thermal power generation. According to the coupling structure, the purpose of fully utilizing sunlight can be achieved, the cooperative utilization efficiency of photovoltaic power generation and photo-thermal power generation is improved, and the coupling structure can be widely applied to tower type, groove type, disc type, Fresnel type and other photo-thermal power stations.

This invention discloses a superhydrophobic radiation-cooling polymer coating, its preparation method, and its application. The coating is white and possesses a bicontinuous micro / nano porous structure. It is prepared by a ternary copolymerization reaction of polyurethane acrylate oligomers, acrylate reactive diluents, and vinyl siloxane porogens. The method involves initiating free radical polymerization of monomers in the porogen under ultraviolet light, inducing rapid phase separation, and naturally evaporating the porogen to obtain the coating. This coating exhibits superhydrophobicity without post-treatment, virtually no absorption in the solar spectrum, and near-100% emissivity in the mid-infrared window. Furthermore, the optical properties and superhydrophobicity of the coating are minimally affected by long-term ultraviolet irradiation, thermal aging, acids, and alkalis. This coating can be applied over large areas in high-performance radiation-cooling applications.

The invention provides a low-frequency sunlight-assisted coal-fired boiler power generation system and method, which are applied to the technical field of electrical energy, and the system comprises a spectrum separation device which is used for carrying out spectrum separation processing on incident solar energy to obtain a solar spectrum of a first wave band and a solar spectrum of a second wave band, and transmitting the solar spectrum of the first wave band to a light-concentrating heat-collecting system, and transmitting the solar spectrum of the second wave band to a photovoltaic power generation device, so that the photovoltaic power generation device performs solar power generation by using the solar spectrum of the second wave band. The light-gathering heat-collecting system is used for heating a circulating working medium in the light-gathering heat-collecting system by utilizing the solar spectrum of the first wave band after receiving the solar spectrum of the first wave band, and heating flue gas in a hearth when the coal-fired boiler receives a work load reducing instruction, so that the temperature of the flue gas reaches the lowest temperature threshold value of the denitration device; the problem that the denitration performance is reduced when the coal-fired power generation unit enters the deep peak regulation state can be solved.

A system for illuminating a target in the presence of atmospheric turbulence includes a coherent beam combining (CBC) subsystem, an atmospheric wave-front sensor (AWS) subsystem, a multi-channel photo-detector (MCPD) subsystem, an auxiliary light source, and a receiving optical aperture. The CBC subsystem forms a multiplicity of CBC sub-beams and an reference beam, all of which fall in a wavelength band that is different from that of the auxiliary light source. The auxiliary light source may be a laser or a portion of the solar spectrum of the Sun. An AWS controller provides closed-loop compensation of atmospheric turbulence for low power auxiliary reflection and reference beams. A MCPD controller provides closed-loop compensation of high-frequency laser noise and transfers the wavefront correction from the reference to the high power CBC laser. The frequency of the MCPD controller is at least an order of magnitude greater than the bandwidth of the AWS controller.

The invention discloses a purple phosphorus-based monatomic catalyst for efficient hydrogen evolution and a preparation method of the purple phosphorus-based monatomic catalyst, and belongs to the technical field of catalysts. The preparation method comprises the following steps: treating block purple phosphorus by a liquid-phase ultrasonic stripping method to obtain a purple phosphorus precursor serving as a carrier; mixing a platinum salt solution with the purple phosphorus precursor to form a mixed solution; and carrying out irradiation treatment on the mixed solution by adopting a standard solar spectrum, so that platinum ions in the platinum salt are reduced and anchored on the purple phosphorus precursor in a monatomic form, thereby obtaining the purple phosphorus-based monatomic catalyst. The whole technological process only relates to common raw materials such as purple phosphorus and trace platinum salt, operation is easy and convenient, cost is low, and product purity is high. According to the method, the monatomic catalyst with a clear structure is successfully constructed through ingenious process design by utilizing the confinement effect of purple phosphorus and the synergistic effect of photoreduction, and a solid foundation is laid for the monatomic catalyst to show high catalytic activity and excellent stability in a hydrogen evolution reaction.

The invention relates to a biomass-based radiation refrigeration fireproof composite material and a preparation method thereof, and belongs to the technical field of macromolecular fireproof composite materials. In order to solve the problem that an existing fireproof coating cannot give consideration to both thermal management and fireproof performance, the invention provides a biomass-based radiation refrigeration fireproof composite material which comprises magnesium-aluminum hydrotalcite powder, cellulose nanofibers and a hydrophobic adhesive. According to the invention, a brick-mud hierarchical structure with a shell-like structure is constructed through electrostatic self-assembly, and the mechanical strength and toughness of the material are improved. The optical performance is improved through a multi-stage scattering interface constructed through CNF, and the solar spectral reflectivity is as high as 95.6%. The emissivity of the atmosphere window wave band reaches 94.9%, the radiation refrigeration power reaches 138.54 W / m < 2 >, and the thermal management performance is far better than that of a traditional fireproof coating. The inherent flame retardant property of Mg-Al LDH is combined with the enhancement effect of CNF, so that the material is endowed with excellent flame retardant property and good thermal stability.

The invention discloses a polar axis type solar direct radiation spectrum measurement method and system, belongs to the technical field of solar direct radiation spectrum measurement, and aims to solve the problems that an existing measurement system depends on complex double-axis tracking, has many errors, is high in maintenance cost and is insufficient in latitude adaptability. The system comprises a polar axis rotating reflector and a solar spectrum measurement system, the polar axis rotating reflector directly radiates and reflects the sun with the solar elevation angle of + / -23.5 degrees and the solar azimuth angle of + / -90 degrees to the measurement system, and measurement is achieved in combination with a spectrum reconstruction model. The spectral resolution is superior to 2 nm, the single-point error ranges from-6.83% to 6.61%, the area error ranges from-0.03% to 0.05%, the space-time uniformity is larger than or equal to 99.92%, the structure is simplified, all-year-round all-latitude high-precision measurement without moving tracking is achieved, and the method is suitable for the fields of solar energy development, climate change research and the like.

The invention relates to the technical field of photoelectrochemical water decomposition, and discloses a solar cell hydrogen production method, which comprises the following steps: S1, collecting solar irradiation data and electrolyte state parameters through a photovoltaic-electrolytic cell integrated new energy battery device, S2, carrying out wave band division processing on a solar spectrum, and S3, carrying out wave band division processing on the solar spectrum, the visible light wave band is directionally transmitted to a photovoltaic unit for power generation, and the infrared wave band is guided to a heat exchange unit for preheating electrolyte; by establishing a frequency division processing mechanism of visible light and infrared bands, solar spectrum energy is distributed to photovoltaic power generation and electrolyte preheating according to needs, irradiation intensity fluctuation and thermoelectric requirements of an electrolytic cell can be matched in real time, cooperative supply of photovoltaic output electric energy and heat exchange power is guaranteed, attenuation of hydrogen production efficiency caused by abnormal spectrum distribution is avoided, and the service life of the hydrogen production system is prolonged. The stability and continuity of the energy conversion process are improved, and the membrane electrode coupling protection end is arranged, so that the long-term operation reliability of the new energy battery device under complex working conditions is guaranteed.