59 results about "Effective precipitation" patented technology

The invention provides a farmland irrigation water amount calculation method and device. The method includes the steps that whether the water content of soil is lower than a preset water content or not is judged; if the water content of soil is lower than the preset water content, the required water amount of a target irrigation area is obtained; the effective precipitation amount of the target irrigation area is obtained; according to the required water amount of the target irrigation area and the effective precipitation amount of the target irrigation area in a time period, the irrigation amount of the target irrigation area is calculated. By means of the method and device, the problem that in the prior art, irrigation water consumption accuracy is low is solved, water requirement conditions of crops in the target irrigation area are quantitatively and periodically reflected, precise utilization of irrigation water is achieved, and unnecessary waste of water resources is avoided.

A method and apparatus for reducing the effective precipitation rate of an irrigation sprinkler during an irrigation cycle without disrupting the supply of pressurized water from the source opening and closing the inlet to the sprinkler riser at timed intervals through the use of a flow stop valve assembly disposed at the base of the riser, and which includes a lost motion piston and cylinder assembly and first and second flow control devices which control the time the flow stop valve is in the open and closed conditions during the irrigation cycle.

The invention provides a method for separating precipitation echoes and sea surface backscattering in the echo signals of a scatterometer. Pulse compression is carried out on the received echo signals to output compressed pulse signals, minor lobe restraining is carried out on the compressed pulse signals through a frequency domain windowing algorithm, the coupling of distance minor lobes existing in precipitation echo signals and sea surface echo signals is eliminated, the time domain aliasing of precipitation and the sea surface is effectively separated, Doppler frequency correction and energy decrement compensation are carried out in a frequency domain, effective precipitation and sea surface backscattering coefficients can be extracted and synchronously inverted from complex air-sea boundary mixed echo signals, the mutual influence can be eliminated or compensated, and the precipitation echoes and sea surface backscattering can be effectively separated.

The invention mainly relates to a method for Chinese pine seedling cultivation and afforestation in a dry stony sunny slope, and belongs to the technical field of forest seedling cultivation and afforestation. In the northern area of China, there is much dry and stony mountain land where the survival rate of afforestation is low and the forest establishment effect is poor. The cultivation and afforestation method comprises the steps that firstly, seedlings are cultivated in a bare-rooted manner in a field land; secondly, the seedlings are transplanted into containers to be cultivated, substrates in the containers are formed by clay and compounds of the clay or the clay and the compounds of agriculture and forestry organic wastes, and the clay in the substrates accounts for 70-80 percent in volume; thirdly, when the container seedlings are used for afforestation, a mode that the container seedlings are not detached from the containers is adopted for afforestation, the bottoms of the containers are removed, and wall cutting treatment is performed on the peripheries of the containers; fourthly, the container seedlings are transplanted into pits, after afforestation is performed, the seedlings can survival for a non-effective precipitation period of a half month to one month, and after the seedlings survival in summer under natural conditions, common intertillage cultivation is performed. According to the method, the survival rate and preserving rate of the Chinese pine seedlings are improved, the growing speed is obviously improved, and the forest establishment effect is better.

The invention discloses an actual water consumption processing method and device for crops and a server. The method comprises: establishing a first model used for calculating the water storage capacity of root layer soil, obtaining the water storage capacity of the root layer soil of an adjacent irrigation day according to the first model, and the adjacent irrigation day at least comprising the day or the day before; establishing a second model for calculating effective precipitation, and obtaining precipitation infiltration amount according to the second model; according to the preset irrigation water depth, the rainfall infiltration amount and the root layer soil water storage amount of the adjacent irrigation days, obtaining the actual water consumption of the crop on the same day. Thetechnical problem that the actual water consumption calculation mode of crops is poor in effect is solved. According to the method, accurate and automatic calculation of the actual water consumption of the crops is realized.

The invention discloses a method for forecasting water burst flood peak and peak time for a karst tunnel underground river. The method comprises the following steps: (1) computing point rainfall; (2) determining areal rainfall according to the point rainfall; (3) computing effective precipitation according to the areal rainfall; (4) computing time interval unit hydrograph; (5) computing effective precipitation unit hydrograph according to the time interval unit hydrograph; (6) computing surface runoff according to the effective precipitation and the effective precipitation unit hydrograph; (7) computing subsurface runoff; (8) adding the surface runoff at each time interval and the subsurface runoff at the corresponding time intervals to obtain flood discharge; (9) performing fitting on value of the flood discharge to obtain a flood hygrograph; and (10) obtaining the flood peak and the corresponding peak time on the flood hygrograph and determining construction time for a karst tunnel according to the flood peak and the corresponding peak time. According to the method provided by the invention, the water burst flood peak in the tunnel and the arrival time of the flood peak can be accurately forecasted, so that the construction time for the tunnel can be reasonably arranged, and the lives of people and the safety of mechanical equipment can be ensured.

The invention discloses high-strength aluminum alloy powder, which is prepared from the following components in percentage by mass: 4.2 to 6.0 weight percent of Mn, 1.2 to 3.0 weight percent of Mg, 0.6 to 1.0 weight percent of Sc, 0.05 to 0.6 weight percent of Zr, 0.01 to 0.2 weight percent of Si, 0.01 to 0.2 weight percent of Fe and the balance of Al. By optimizing the content of the alloy elements such as Mn, Mg, Fe and Si, the remarkable solution strengthening effect is achieved; by adding Sc and Zr, local formation of equiaxed grains is promoted, crack formation and expansion are inhibited, and meanwhile, an effective precipitation strengthening effect is achieved by means of dispersion particles generated in the aging process.

The invention discloses a method for measuring an isothermal precipitation kinetics curve of carbide. The method comprises steps as follows: 1) compressed yield stress values of a to-be-tested part at set isothermal temperatures and at isothermal time are acquired through a thermal simulated test machine; 2) effective precipitation coefficients feff used for representing a relative quantity of a precipitated phase effectively strengthened in the precipitation process are acquired according to the strength increment delta sigmate y and the largest strength increment delta sigmate y, max of the compressed yield stress values relative to the smallest compressed yield stress value, and feff is equal to the quotient obtained by dividing delta sigmate y, max by delta sigmate y; 3) the precipitation kinetics curve of the carbide in the isothermal process is drawn according to corresponding relations of the effective precipitation coefficients, the isothermal temperatures and the isothermal time under various isothermal conditions. A measurement parameter adopted in the method is the compressed yield stress, the strengthening function of isothermal precipitation is directly reflected, the practicability is high, the method can be directly used for process improvement, data are more visual, sensitive and accurate, and operation is simpler, more convenient and more effective.

A method for preparing a selenium-rich feed additive is disclosed. The method includes applying a selenium-rich organic fertilizer for Chinese milk vetch in one time before flowering after the beginning of spring, watering the Chinese milk vetch for one time if no effective precipitation occurs in seven days after fertilization, harvesting two thirds of overground parts after the Chinese milk vetch is ripe, and drying and crushing the harvested Chinese milk vetch to prepare the selenium-rich feed additive. The dry-weight selenium content of the selenium-rich Chinese milk vetch is 3-50 mg / kg. The harvested selenium-rich Chinese milk vetch is dried in a dryer having a temperature of 80-120 DEG C until a constant weight. The dried selenium-rich Chinese milk vetch is crushed by a crushing machine into powder particles having a size of 80-200 meshes. 20-500 kg of the selenium-rich organic fertilizer is applied per mu. Through converting inorganic selenium into organic selenium through the Chinese milk vetch, storing the organic selenium in the Chinese milk vetch, and preparing the Chinese milk vetch into the additive for animal feed, production performance and immunity of livestock and poultry can be effectively improved, selenium-rich eggs and selenium-rich meat can be produced, and a selenium poisoning hidden danger caused by addition of the inorganic selenium into feed can be solved well.

The invention discloses a plastic-film mulching cultivation method for dangshen plantation suitably used in an arid mountainous area. The plastic-film mulching cultivation method comprises following steps: preparing soil and applying fertilizers; processing seedlings; digging trenches and cultivating; performing fine management and harvesting. The plastic-film mulching cultivation method for dangshen plantation suitably used in the arid mountainous area has following beneficial effects: advanced plastic-film mulching cultivation technology is utilized for replacing conventional dangshen plantation and anti-drought measures such as temperature increase and soil moisture conservation, moisture perseveration and increase, rain collection, seepage storage and runoff interception are integrated with weed control, control of pests and diseases and automatic seedling technology, light rainwater turns into heavy rainwater and uneffective precipitation turns into effective precipitation by utilization of an arch film surface for rainwater collection; soil seepage storage between ridges. precipitation collected by the film surface and soil evaporation collected inside the film are utilized for directly supplying moisture into dangshen seedlings; passive drought resistance becomes active drought resistance; microbial insecticides are utilized for controlling underground pests and soluble microbial products; botanical bactericides are utilized for controlling soil-borne diseases; the manner of firstly planting seedlings, ridging and then laminating is adopted so that heads of dangshen seedlings are kept outside a mulching film; other parts are kept into the mulching film; and the working link of releasing seedlings is eliminated.

The invention provides a method for analyzing the water demand of farmland irrigation levels. The method comprises the following steps: analyzing the rigid water demand of farmland irrigation according to the theoretical water demand and effective precipitation in the growth period of crops; The elastic water demand for farmland irrigation is analyzed by coefficient; the luxury water demand for farmland irrigation is analyzed according to the actual utilization coefficient of irrigation water which is lower than the effective utilization coefficient of advanced farmland irrigation water recommended by the local area. According to the method for analyzing the water demand of farmland irrigation levels in the embodiment of the present invention, the problem of inaccurate calculation of the water demand for farmland irrigation is solved, and the water demand for farmland irrigation is analyzed and calculated in different levels, so that the water demand of each level of farmland irrigation can be accurately analyzed and calculated. , improve the efficiency of farmland irrigation water use, save water resources, point out the direction for the management and control of farmland irrigation water use, and provide a reliable basis for irrigation water management guidance and planning and allocation.