36 results about "Net radiation" patented technology

The invention provides a crops water forcing index determining device and method. The determining device includes: data collecting and processing units, composed of a data collecting probe and of data collector and calculating unit, respectively and connected with each other; the data collecting probe includes infrared temperature measuring probe, ventilated psychrometer, solar net radiation meter, and wind velocity indicator. It also includes application of determining method in determining crops water forcing index. The monitoring station can be set in any position in the farm, enhancing working efficiency, making it unnecessary bury the system underground, providing convenient condition for agricultural mechanical labor. The system applies CWSI theoretical mode to diagnose water forcing and form an irrigating policy, enhancing diagnosis precision, able to largely reduce the waste in water resource and enhancing the utilization ratio of irrigating water resource.

The invention provides a construction method of a regional scale double-source evapotranspiration model considering dynamic vegetation change. The construction method comprises the following steps: S1, performing regional evapotranspiration estimation of the double-source evapotranspiration model: calculating net radiation data of a required regional scale input by a model; calculating net radiation components Rns and Rnc; calculating each influence factor; performing simulated estimation on evapotranspiration ET; s2, carrying out parameter optimization under different vegetation types; s3, performing simulation effect verification of the regional scale double-source evapotranspiration model considering dynamic vegetation change: performing site scale verification; performing regional scale verification; and performing basin scale verification. According to the model disclosed by the invention, the dynamic change of the vegetation is incorporated into evapotranspiration calculation andanalysis, and meanwhile, the model is expanded to a regional scale, has a multi-scale analysis function and has the advantage of few aerodynamic parameters of the PT-JPL original model, has low requirements on ground data and aerodynamics, and plays a role in promoting the accuracy improvement of regional scale evapotranspiration estimation.

The invention discloses a method and system for diagnosing plant water stress based on high-flux stomatal conductance, and belongs to the technical field of agricultural irrigation. A plant water stress diagnosis system consisting of high-flux stem flow, meteorological data, net radiation measurement equipment and plant height leaf area parameter auxiliary measurement is combined with a P-M formula to continuously output high-flux stomatal conductance, so that a water stress index is calculated by utilizing the stomatal conductance; and the long-time, accurate, high-pass and continuous monitoring, quantification and diagnosis of plant water stress are realized; a reference plant growing under the condition of no water stress is placed in the same growth climate environment as a plant to be detected, and according to the characteristic that the stomatal conductance of the plant is very sensitive to the water stress, the invention provides an index for diagnosing the water stress of the plant. The index can be obtained by calculating the stem flow, net radiation and meteorological data of the to-be-measured plant and the reference plant which are automatically measured in a high-flux manner, so that the high-flux quantification and diagnosis of the water stress degree of the to-be-measured plant are realized. The method comprehensively considers plant physiological response and environmental influence, and has the characteristics of physiological basis, reliable data, long-time accuracy and high-pass continuity in the application of diagnosing plant water stress.

The invention belongs to the field of novel energy technical development, in particular to a three-dimensional tapered nano-layer film structure, a preparation method thereof and application thereof.The three-dimensional tapered nano-layer film structure provided by the invention comprises silicon dioxide layer-hafnium dioxide composite layers and sliver layers, wherein silicon dioxide layers arearranged above hafnium dioxide layers; number of the silicon dioxide layer-hafnium dioxide composite layers is greater than 10; and the silicon dioxide layer-hafnium dioxide composite layers are arranged above the sliver layers. The invention further provides a preparation method for the three-dimensional tapered nano-layer film structure, and further provides application of the three-dimensionaltapered nano-layer film structure or a product prepared by the preparation method in a radiation cooling device. The three-dimensional tapered nano-layer film structure is introduced, so that high-performance dual-window atmospheric radiation can be realized, and high-efficiency passive radiation cooling ability can be finally realized. The technical defect that a daytime cooling method has low net radiation cooling power in the prior art is solved.

The invention provides a construction method of a regional scale evapotranspiration model synchronously considering dynamic changes of a vegetation canopy and a root system. The construction method comprises the following steps: S1, calculating net radiation, net radiation components and influence factors through regional scale data required by a PT-JPL model; s2, estimating the plant effective root depth Zr of the Chinese regional scale based on a Guswa model; and S3, coupling the effective root depth Zr of the plant into the PT-JPL three-source evapotranspiration model to construct a regional scale evapotranspiration model synchronously considering the dynamic change of the vegetation canopy and the root depth. According to the model, the vegetation dynamic change and the plant effective root depth are jointly incorporated into evapotranspiration calculation and analysis, the transverse change (vegetation coverage) of the vegetation dynamic state is considered, meanwhile, the longitudinal change (root depth) of the vegetation change is considered, the multi-scale analysis function is achieved, the requirements for ground data and aerodynamics are low, and the method is easy to implement. And the improvement of the evapotranspiration of the regional scale and the evapotranspiration component estimation accuracy is promoted.

The invention relates to a method for acquiring an internal temperature field of a baking box. The method comprises steps of radiation force calculation, gray body angle coefficient calculation, net radiation quantity calculation and variable and sensitivity analysis.

The embodiment of the invention provides an earth surface net radiation estimation method and system, electronic equipment and a storage medium, and the method comprises the steps: determining the multi-source data of a to-be-measured region based on the first remote sensing data and reanalysis meteorological data of the to-be-measured region or the second remote sensing data, the reanalysis meteorological data and the downlink short-wave radiation from station actual measurement data, wherein the first remote sensing data comprises downlink short-wave radiation, and the second remote sensingdata does not comprise downlink short-wave radiation; inputting the multi-source data into an earth surface net radiation estimation model to obtain an earth surface net radiation estimation result, output by the earth surface net radiation estimation model, of the to-be-measured area, wherein the surface net radiation estimation model is obtained by training based on sample site actual measurement data, a sample normalized vegetation index and sample reanalysis meteorological data of a sample region, actual measurement data of the sample station comprises sample downlink short-wave radiation,sample surface albedo and sample surface net radiation, and high-precision and high-resolution estimation of the surface net radiation is realized.

The invention provides a method of using shortwave radiation to estimate long-wave net radiation and downlink radiation and an apparatus thereof. The method of using shortwave radiation to estimate long-wave net radiation comprises the following steps of acquiring a short wave net radiation sample and a long wave net radiation sample; establishing a mathematical relationship between the short wave net radiation sample and the long wave net radiation sample; acquiring a remote sensing image to be processed; calculating the short wave net radiation corresponding to the remote sensing image; substituting the short wave net radiation into the mathematical relationship so that the long wave net radiation corresponding to the remote sensing image is acquired; and further, according to the long wave net radiation, acquiring long wave downlink radiation. Through the method and the apparatus, no matter in a cloud condition or under a clear sky condition, the short wave radiation can be used to estimate long wave radiation and a technical problem that the long wave radiation can not be acquired from the remote sensing image in the cloud condition so that a long wave radiation space is not continuous in the prior art is solved.

The invention discloses a crop irrigation method, device and system and a readable storage medium, and belongs to the technical field of agriculture, and the method comprises the steps: S1, collectingcrop environment information from a vegetation field of a crop, wherein the crop environment information comprises temperature data, humidity data, long-wave net radiation data and short-wave net radiation data; s2, processing the crop environment information by using a maximum entropy increase model to obtain a potential evapotranspiration amount and an actual evapotranspiration amount of the crop; S3, calculating a crop coefficient Kc corresponding to the crop by utilizing the potential evapotranspiration and the actual evapotranspiration, wherein the crop coefficient Kc is used for representing the condition that the crop is subjected to water stress; and S4, generating an irrigation strategy based on the crop coefficient Kc corresponding to the crop so as to irrigate the crop. Crops are irrigated in a targeted mode, the irrigation reliability is good, the irrigation accuracy is high, and the problem that the crops are not fully irrigated or excessively irrigated can be effectivelysolved.

The invention discloses a simplified climatic change prediction method. The method comprises the following steps: firstly, obtaining annual average net radiation force according to heat absorption and heat release of the earth, and performing regression analysis according to the change of annual average forced radiation and the change of average temperature to obtain a simplified linear model; considering ocean temperature changes, carrying out data fitting on existing ocean temperature data, predicting future global ocean temperature changes through an improved neural network model, and finally carrying out polynomial fitting by combining the ocean temperature changes with earth surface temperature changes to determine global climate changes.

The invention discloses a method for improving an areal aridity/humidity simulating effect. The method comprises the following steps: collecting monthly meteorological data of each site in a study area and net long wave radiation data in the study area, calculating total radiation simulation values by at least two total radiation correcting methods respectively, comparing all the total radiation simulation values with a total radiation observation value respectively, and judging out the total radiation correcting method with the highest accuracy; calculating net long wave radiation values by different net long wave radiation calculating methods, then judging out the net long wave radiation calculating method with the highest accuracy, and calculating a radiation correcting formula of net radiation; calculating the largest possible evapotranspiration according to the radiation correcting formula, and calculating an aridity/humidity index according to the largest possible evapotranspiration. Compared with the conventional FAO56 model calculation method, the method provided by the invention has the advantages as follows: through modification of the conventional model estimation method, the aridity/humidity simulating effect is improved, the applicable area of the model estimation method is widened and the model estimation method is higher in accuracy and better in reliability.

The invention relates to a method and a device for estimating clear sky solar radiation in an oasis farmland. The method comprises the following steps: determining the earth's surface albedo and the earth's surface reflectance; utilizing a thermal infrared wave band to determine the earth's surface temperature, and affirming that the earth's surface temperature is equal to the air temperature based on the standard reference surface within the range of the oasis farmland; utilizing ground measured data to acquire downstream short-wave radiation and downstream long-wave radiation; utilizing the acquired data to determine the ratio of net radiation flux, average daily net radiation and instantaneous net radiation, the ratio of daytime net radiation to the instantaneous net radiation, and the ratio of the instantaneous net radiation at time t2 and the instantaneous net radiation at satellite passing time t1; according to the ratio of the net radiation flux, the average daily net radiation and the instantaneous net radiation, the ratio of the daytime net radiation to the instantaneous net radiation, and the ratio of the instantaneous net radiation at time t2 and the instantaneous net radiation at satellite passing time t1, determining the average daily net radiation, the daytime net radiation and the net radiance at any time point.

The existing method for measuring the radiant heat flow of a building envelope has the two problems of (1) larger error and (2) low measurement efficiency. In order to overcome the defects of the radiant heat flow measuring method, the invention provides a method for quantitatively measuring the net radiation heat flow of the outer surface of a building envelope based on an infrared imaging technology. On the basis of the Stefan-Boltzmann law, the infrared thermal imaging technology and infrared thermal imaging processing software are adopted, so that the net radiant heat flow of the outer surface of an envelope can be rapidly calculated in different regions and under different building conditions, and the defects of existing radiant heat flow measurement are well overcome.