466 results about "Bulk density" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention discloses an SAR (Synthetic Aperture Radar) soil surface water content inversion method and device based on deep learning, and the method comprises the steps: constructing a deep learning regression model for predicting the volume content of soil water through combining SAR data, auxiliary data and in-situ sensor data; a ConvNeXt model is adopted to construct a parallel convolution encoder to solve multi-source data with different input resolutions, and back scattering coefficients, spectral information, digital elevation model high-resolution data and soil sand content, sludge content, clay content and stacking density low-resolution data are fused into soil moisture estimation. And the inference capability of unknown data is improved. The model obtained by training can realize large-range and high-resolution automatic estimation of the water content of the soil surface layer. According to the invention, the influence of radiation transmission noise is avoided, the inversion precision of a vegetation coverage area is improved, and large-range high-resolution automatic processing of soil humidity products is realized.

The invention relates to the technical field of control systems, and particularly discloses a crushed material drying system and an operation method thereof, and the crushed material drying system comprises a data acquisition module, a multi-source data fusion module, a dynamic shunting decision module, a cooperative control module and a tail gas treatment optimization module. The data acquisition module acquires particle size distribution, moisture content, stacking density and dust concentration data of materials in real time through a laser scattering type particle size analyzer and a microwave moisture sensor, and transmits the data to the multi-source data fusion module through a Modbus protocol; according to the operation method, through an abnormal working condition grading alarm mechanism, a genetic algorithm optimization fuzzy rule base and multi-module data linkage, the problems of local overheating and low energy efficiency caused by parameter mismatch in traditional control are solved, and global optimization of drying efficiency, energy consumption and operation stability is achieved.

The invention belongs to the technical field of quartz sand, and discloses a roasting method for controlling the pore defect of quartz sand and increasing the stacking density, which comprises the following steps: 1) drying silicon dioxide gel prepared by a sol-gel method to obtain silicon dioxide powder; (2) the silicon dioxide particles are placed in a roasting furnace, the furnace temperature is preheated to 400-700 DEG C after vacuumizing is conducted, then the furnace is maintained in a vacuum environment for a period of time, then oxygen-containing atmosphere is filled into the furnace and maintained for a period of time, the vacuum environment and the oxygen-containing atmosphere environment are alternately conducted, and sufficient decarburization is achieved; and (3) vacuumizing again, raising the furnace temperature to 1100-1300 DEG C, maintaining for a period of time in a vacuum environment, filling inert gas into the furnace, maintaining for a period of time, alternately vacuumizing and filling the inert gas, and sintering the quartz sand. According to the method, preheating is performed for sufficient decarburization, then high-temperature sintering is performed, the finally obtained quartz sand does not have obvious air holes, and the bulk density is larger than or equal to 1.3 g / cm < 3 >.

An adsorption system having at least one adsorber retaining a bed of adsorbent material can be configured to provide enhanced purification of fees having relatively low concentrations of hydrogen or helium. Embodiments can utilize an activated carbon layer between at least one upstream layer and at least one downstream layer. The activate carbon layer can include activated carbon can have a pre-selected surface area (SA), bulk density, total open pore volume (TOPV), and / or ratio of TOPV to surface area (TOPV / SA).

The utility model relates to a mineral powder production system which comprises a first raw material bin and a second raw material bin, the first raw material bin is connected with a raw material weighing feeder, the discharging end of the raw material weighing feeder is connected with a chute, and the chute is connected with a grinding machine; the second raw material bin is connected with a crusher, the crusher is connected with a powder concentrator, a coarse powder bin and a fine powder bin are arranged at the downstream of the powder concentrator, powder in the fine powder bin is stirred by adding water through a first kneading machine, and superfine powder is obtained after stirring and fine grinding; the powder in the coarse powder bin is mixed and stirred with the superfine powder through the second kneading machine, and the mixed powder obtained after mixing and stirring is conveyed to the chute, mixed with the raw material powder and then introduced into the grinding machine. The particle composition state of the powder can be improved, the particle size distribution of the powder is obviously changed, the peak width on a particle size distribution diagram is widened, the peak height on the particle size distribution diagram is reduced, the level difference is increased, and higher bulk density is achieved.

The invention relates to the technical field of soil improvement, in particular to a saline-alkali soil improvement method which comprises the steps of dividing a to-be-improved saline-alkali soil area, detecting the saline-alkali distribution depth of the area and determining the ploughing depth by combining the depth of a target plant root system. Adjusting parameters of the ploughing device according to the difference between the depth and the soil permeability coefficient; setting initial leaching water pressure according to the ploughing parameters, detecting the concentration of sodium ions in discharged water, and adjusting the pressure according to the change curve of the period; when the slope of the curve reaches a preset value, measuring the proportion of sodium ions adsorbed by soil colloid, and comparing the proportion with a standard interval to judge whether continuous spraying is carried out or not. Whether the soil bulk density is detected or not is determined according to the result, ploughing parameters are fed back and adjusted according to the bulk density result, and the improvement requirement is met. According to the method, the ploughing parameters are adjusted through the target ploughing depth and the soil permeability coefficient difference value, and the leaching water pressure is adjusted according to the sodium ion change curve, so that the sodium ion removal efficiency is improved, and then the subsequent improvement efficiency of the saline-alkali soil is improved.

The invention discloses a device and a method for preparing a negative carbon cementing material by a wind power suspension semi-dry method, and belongs to the technical field of comprehensive utilization of solid waste resources. The method for preparing the negative carbon cementing material comprises the following steps: keeping the humidity and CO2 concentration of a reaction system, and carbonizing the wet steel slag micro-powder in the reaction system while the wet steel slag micro-powder is in a suspended state under the action of wind power, so as to obtain the negative carbon cementing material. The CO2 storage rate of the prepared negative carbon cementing material is equivalent to that of wet carbonization, the CO2 storage rate of the negative carbon cementing material is 8-12%, and the bulk density is 1.05-1.2 g / cm < 3 >. In the preparation process, the water resource consumption is extremely low, no wastewater is discharged, and water resource waste and wastewater discharge pollution are avoided.

Systems and methods for analyzing soil are generally provided. In particular, the disclosure provides systems and methods for determining bulk density of soil using rotational soil penetrometers. In some embodiments, the bulk density is determined by obtaining spectroscopic data and penetration torque data from the rotational soil penetrometer, and determining the bulk density of the soil based at least in part on the spectroscopic data and the penetration torque data. Bulk density may be combined with in situ measurements of elemental composition (e.g., carbon content) of soil in order to calculate total quantities of an element (e.g., carbon) in an area's topsoil. Also disclosed herein are systems and methods for modeling bulk density and / or carbon content of soil, based at least in part on spectroscopic data and penetration torque data. For example, trained statistical models determination are provided herein.

The invention provides a soil health evaluation method. The method comprises the following steps: acquiring community characteristics of soil arthropods of to-be-evaluated soil; the soil arthropods are selected from at least one of diptera arthropods, arthropods of arachnids, coleoptera arthropods, hymenoptera arthropods and lepidoptera arthropods; the community characteristics comprise species composition and relative abundance of species; predicting soil indexes according to the community characteristics; the soil index is selected from at least one of a soil physicochemical index, a soil degradation index and a soil health index; the soil physical and chemical indexes are soil pH, soil total carbon, soil organic carbon and soil total nitrogen; the soil degradation indexes comprise a soil pH degradation index, a soil total carbon degradation index, a soil organic carbon degradation index and a soil total nitrogen degradation index; the soil health index is determined based on soil pH, soil microbial biomass nitrogen, soil respiration rate, soil total carbon, soil organic carbon, soil total nitrogen and soil bulk density; and performing soil health evaluation based on the soil indexes.

The invention provides a water-retaining material as well as a preparation method and application thereof, and finds that corn glume has extremely high water absorption rate and can be used as an excellent water-retaining material. The glume is obtained by crushing corncobs and then carrying out winnowing and gradient sieving, and the particle size is 2-3mm. In order to effectively utilize the material, the obtained corn glume, a binder, an expanding agent and water are mixed and granulated to prepare water-retaining agent particles, and the water-retaining agent particles are easy and convenient to apply, high in water-retaining capacity and capable of effectively improving the water-retaining capacity of soil and improving the temperature, humidity, conductivity and bulk density of the soil; therefore, the method has important commercial value for soil and land improvement.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a compound conditioner for treating sulfate type saline-alkali soil and application of the compound conditioner. The compound conditioner is formed by compounding hydrotalcite, acidic zeolite and humic acid; wherein the hydrotalcite is nitrate intercalated MgAl-LDH or MgFe-LDH, and the molar ratio of divalent metal ions to trivalent metal ions of the hydrotalcite is (2: 1)-(4: 1); the acidic zeolite is clinoptilolite treated by a nitric acid solution; the humic acid is mineral source humic acid, and the purity of the humic acid is greater than 80%. The compound conditioner disclosed by the invention can mineralize Na < + > and SO4 < 2-> which are too high in content in saline-alkali soil, reduce the salt content and pH and prevent plants from osmotic stress and alkaline toxicity; the content of nitrate nitrogen and organic matters in soil is increased, and nutrient substances are provided for plants; the soil structure is improved, the water-retaining property and the air permeability are enhanced, the soil bulk density is reduced, and plant germination and root growth are facilitated.

The invention discloses a crop planting substrate for promoting rhizome system development and a preparation method thereof. The substrate comprises the following components by volume ratio: 10-20% of straw biogas residue; 50-60% of peat; 15 to 25% of vermiculite; 15 to 25% of perlite; wherein the substrate further comprises a functional additive, and the functional additive is selected from one or more of potassium fulvate, chitosan or plant growth promoting flora. The crop planting substrate provided by the invention significantly promotes the development of rhizome systems through the synergistic effect of the organic-inorganic composite system and the functional additive. The layered structure design optimizes the slow-release effect of water and fertilizer, the water-absorbent resin enhances the water-retaining property, the slow-release fertilizer particles provide continuous nutrients, and the pH regulator maintains a suitable acid-base environment. Compared with a traditional substrate, the volume weight, the total porosity and the gas-water ratio of the substrate are more suitable for root growth, and the substrate is especially suitable for seedling raising of crops such as rice and traditional Chinese medicinal materials.

The invention relates to a method and a device for measuring a soil disturbance profile of an agricultural soil touch component, and belongs to the technical field of soil disturbance measurement. The method comprises the following steps that microwaves are emitted to soil of the cross section of an operation area after the agricultural soil touch component operates, reflected waves reflected by the soil are measured, the area with the large microwave reflection loss is determined from the reflected waves, and the boundary of the area serves as the soil disturbance outline. Microwaves are emitted to the soil of the cross section of the working area after the agricultural soil touching component works, reflected waves reflected by the soil are measured, the area with the large microwave reflection loss is determined from the reflected waves, when the soil bulk density corresponding to the microwave reflection loss is reduced by 20% or above, it is considered that the microwave reflection loss is large, and the area with the large microwave reflection loss is determined. According to the method, the boundary of a large area in microwave reflection loss serves as the soil disturbance contour, accurate measurement of the soil disturbance contour is achieved, manual repeated measurement is not needed, and accurate measurement can be conducted on the complex shape of the disturbance area after operation.

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention discloses a device and method for testing the repose angle of energetic material particles with low free-flow and low stacking density, the testing device comprises a protractor and a stacking mechanism, the stacking mechanism comprises a base, a negative pressure cover is arranged on the base, a door capable of being opened and closed is arranged on the negative pressure cover, and a charging barrel is arranged in the negative pressure cover; the charging barrel is provided with a voice coil motor serving as a vibration source, the charging barrel is further connected with a clamping mechanism, and the other end of the clamping mechanism penetrates out of the side wall of the negative pressure cover and is connected with a stand column arranged on the base; a suction opening used for being connected with negative pressure equipment is formed in the position, located above the charging barrel, of the top of the negative pressure cover. According to the cylindrical charging barrel, the problems that energetic material particles of a conical charging barrel are prone to bridging, and accumulation bodies are difficult to form are solved; the voice coil motor serves as a vibration source, the consistency and stability of the energetic material in the initial state are guaranteed, the energetic material particles floating in the air are pumped away by providing a negative pressure environment, and the safety and accuracy of repose angle testing are obviously improved.

The invention discloses a method for synergistically preparing a carbon-based soil conditioner from coal gangue and straw, and relates to a method for preparing the carbon-based soil conditioner. The invention aims to solve the technical problem that a large amount of coal gangue and agricultural straws are accumulated as wastes in the prior art to cause harm to the environment. The preparation method comprises the following steps: firstly, carrying out ultramicro activation pretreatment on coal gangue through mechanical grinding; then, adopting a double-atmosphere segmented pyrolysis process: generating a plant ash silicon fertilizer rich in KCl and K2CO3 in an air atmosphere; preparing a biochar material with a hierarchical porous structure under the protection of nitrogen; accurate compounding of the activated silicon fertilizer and the porous biochar is achieved through solid-phase mixing, finally, the activated silicon fertilizer and the porous biochar cooperate with the vinegar residue organic material to form the organic-inorganic composite carbon-based soil conditioner, the soil conditioner has the weakly acidic pH regulation and control function, the mineral nutrition slow release characteristic and the multi-scale pore structure characteristic, formation of saline-alkali soil aggregates is effectively promoted, the soil structure is improved, and the soil quality is improved. The volume weight of soil is reduced, and the effectiveness of phosphorus and the bioavailability of silicon are remarkably improved.

The invention provides a method for improving land through cooperation of coal-based solid waste and agricultural waste, and belongs to the technical field of solid waste reutilization. According to the method, coal gangue and other solid waste are used as main raw materials, different application modes are provided for mine area land restoration and desertification land improvement, the scientific, reasonable, economical and safe ecological restoration mode is adopted, the requirements for mine area land desertification and ecological restoration of a mine area are met, and the method is suitable for popularization and application. And a feasible solution is provided for regions taking coal-based industry and animal husbandry as the pillar industry, and the ecological restoration effects of treating waste with waste and turning waste into wealth are achieved. Results of the embodiment show that when the method provided by the invention is used for land improvement, the volume weight and the field moisture capacity of the soil can be effectively improved, nutritional ingredients in the soil are greatly improved, and the improved soil meets the standard of Soil Environment Quality Agricultural Land Soil Pollution Risk Management and Control Standard (Trial) (GB15618-2018).

The bulk density is increased by applying vibration to a container filled with powder or granular material with a simple structure and without requiring any additional power source. [Solution] In a method for filling powdered or granular material W, in which a number of consecutive containers 2 are moved along a predetermined conveying route R and powdered or granular material W is supplied to containers 2 that have reached a supply position R1, an impact section 40 having a base end 41 fixed outside the movement trajectory S of the container 2, a tip end 42 located inside the movement trajectory S and supported in a cantilevered state, and a connection section 45 that elastically connects between the base end 41 and the tip end 42 is used, and the tip end 42 is abutted against the preceding container 2L and displaced as the preceding container 2L moves, thereby elastically deforming the connection section 45, and when the tip end 42 moves away from the preceding container 2L as a result of further movement of the preceding container 2L, the elastic deformation is released, causing the tip end 42 to impact the following container 2T.

A composition for reducing the bulk density of quartz sand and a preparation process therefor. The composition comprises the following components in parts by weight: 800-1200 parts of 40-70-mesh activated quartz sand, 8-10 parts of a modified epoxy resin, 30-50 parts of a powder, 1-3 parts of a curing agent and 0.5-1.5 parts of calcium stearate. In the composition for reducing the bulk density of quartz sand and the preparation process therefor, the quartz sand is subjected to a surface treatment, so artificial micro-nano protrusions are formed on the surface of the quartz sand and the bulk volume of the quartz sand is increased without affecting the sphericity, and thus the bulk density of the quartz sand is reduced. The bulk density of the treated quartz sand is reduced from 1.5 g / cm3 to 1.4 g / cm 3 or less, with a level of reduction exceeding 6%.

The invention relates to a preparation method of quartz sand, and belongs to the technical field of quartz. The preparation method comprises the following steps: S1, adding a polyvinyl butyral solution into silica sol, and uniformly stirring to obtain silica sol dispersion liquid; the polyvinyl butyral solution comprises polyvinyl butyral (PVB) and tert-butyl alcohol; s2, performing spray drying on the silica sol dispersion liquid to obtain quartz microspheres; and S3, carrying out oxidation carbon removal treatment and vacuum dehydroxylation treatment on the quartz microspheres to obtain the quartz sand. Drying cracking and micro-hollow structure defects of the quartz sand can be effectively eliminated, it is ensured that the product is compact and free of pores, and the structural integrity and the use reliability are greatly improved; the density performance bottleneck of quartz sand is successfully broken through, and the bulk density after sintering is remarkably improved; the particle size distribution of the quartz sand can be accurately controlled, and the product particle size uniformity is ensured.

The invention provides a soil carbon reserve measuring and calculating method and system and a medium, and belongs to the technical field of organic carbon reserves, and the method comprises the following steps: obtaining surface layer reflectivity spectral data of each layer of soil after construction of a disturbance area; dividing a plurality of grids based on the spatial distribution characteristics of the reflectivity spectrum; according to the coordinates of the center position of each grid, the soil texture and land utilization type corresponding to each grid in the database are called, and according to the reflectivity spectral characteristics of each grid, the soil organic carbon content on each grid is inverted through a pre-trained organic carbon content estimation model; according to the center position coordinate of each grid, calling the corresponding soil bulk density on each grid in the database, and determining the soil organic carbon reserve on each grid based on the soil bulk density and the soil organic carbon content; wherein the database stores soil texture, volume weight and land utilization type data corresponding to different coordinates; and obtaining the soil organic carbon reserve of the disturbance area according to the soil organic carbon reserve of each grid. The method can efficiently calculate the soil carbon reserve in the field.

The invention relates to the field of agricultural planting, in particular to a post-ginseng land soil improvement method based on compound bacteria fermentation degradation of allelochemicals. The invention provides a main technological process for improving soil through a fermentation method. The main technological process comprises the steps of land consolidation, ridge forming and pond building, material preparing and feeding and soil-material mixing, zymophyte inoculation and bacterium-material combination, film mulching anaerobic and fermentation monitoring, fermentation completion and post-treatment. The invention also provides a complex microbial inoculant composition capable of achieving the improvement effect, and the complex microbial inoculant composition comprises the following components in parts by weight: 5 parts of straw returning agent, 3 parts of organic fertilizer leavening agent and 1 part of bacillus subtilis agent. According to the method, the improved soil is subjected to long-time anaerobic fermentation in the water stain micro-ecological environment, the organic matter content of the soil can be greatly increased by adding a large number of organic matter materials, the carbon / nitrogen ratio of the soil is increased, the bulk density of the soil is reduced, fertility is comprehensive, sufficient and balanced, and the method is suitable for continuous cropping planting and healthy growth of ginseng.

The invention provides a ceramsite proppant as well as a preparation method and application thereof. The method comprises the following steps: grinding a coal gangue raw material, pre-sintering, cooling and then grinding again; grinding the tungsten tailing sand, the low-grade bauxite, the carbide slag and the clay; grinding after mixing the raw materials; the raw materials comprise 45-60 parts of low-grade bauxite, 20-35 parts of pre-sintered coal gangue, 15-20 parts of tungsten tailing sand, 1-5 parts of carbide slag and 7-14 parts of clay; the total amount of the low-grade bauxite, the pre-sintered coal gangue and the tungsten tailing sand is 100 parts; granulating and drying; carrying out first sintering at 800-950 DEG C; second sintering is conducted at the temperature of 1050-1200 DEG C; and naturally cooling to obtain the ceramsite proppant. The technical problem to be solved is how to realize high-valued utilization of mine solid waste and low-grade bauxite, reduce dependence on high-quality bauxite and production cost, reduce sintering energy consumption and carbon emission, reduce product body density and improve key performance such as strength and sphericity of the proppant by optimizing raw material combination and a preparation process. And the requirements of oil and gas field fracturing operation are met.

The invention discloses a rapid distinguishing method for predicting a nitrogen source produced by flooded soil through combination of in-situ observation and a model, and relates to the technical field of agro-ecology. Field micro-areas are divided in a target area, an intelligent sensing system is deployed, and soil environment parameters are monitored in real time; the method comprises the following steps: sampling soil in a target area, measuring soil bulk density, root layer depth, total nitrogen content and 15N abundance parameters of a soil sample, and obtaining soil basic data; and calculating the optimal 15N fertilizer abundance according to the recommended nitrogen fertilizer dosage recommended by the target area in combination with the soil nitrogen library content, the fertilizer application amount and the soil background 15N abundance. According to the method, dynamic changes of soil environment parameters are captured through combination of in-situ observation and an intelligent sensing system, the generation rate of nitrogen isotopes is monitored synchronously, the limitation that a traditional method depends on a single parameter is avoided, the distinguishing precision of nitrogen loss sources is remarkably improved, and the contribution rate of the in-situ observation and the intelligent sensing system to nitrogen loss can be rapidly calculated by combining model analysis.

The invention belongs to the field of fertilizers, and particularly relates to a soil conditioner and application thereof. The soil conditioner is prepared from the following components in parts by weight: 20 to 60 parts of biochar, 10 to 50 parts of silicon-calcium-potassium-magnesium, 10 to 30 parts of bentonite, 15 to 35 parts of surfactant and 3 to 15 parts of biostimulant, the surfactant comprises one or more of sodium lignin sulfonate, sodium taurine laurate or rhamnolipid, and the biostimulant comprises one or more of humic acid, chitosan, trehalose or polyglutamic acid. The conditioner is prepared by compounding a plurality of surfactants and biostimulant, and has three significant soil conditioning properties of ventilation, fertility increase and water retention. The soil conditioner can break soil hardening, loosen soil, improve soil permeability, reduce soil bulk density, promote soil microbial activity, enhance soil fertilizer and water permeability and improve crop yield.

The invention discloses application of biochar in saline-alkali soil improvement and crop quality and yield improvement, and relates to the technical field of biochar soil improvement and crop yield and quality improvement. Comprising a biochar saline-alkali soil improvement and crop quality-improving and yield-increasing system which is used for acquiring degradation weight data of biochar and physical and chemical data of saline-alkali soil, acquiring correlation between saline-alkali soil data and biochar degradation degree by using a Pearson correlation coefficient, calculating the biochar degradation degree, constructing a biochar degradation monitoring model, and monitoring the quality of the saline-alkali soil in the biochar degradation monitoring model. According to the method, the soil bulk density measurement technology, the drying acquisition technology and the modern information technology are combined, the soil bulk density measurement technology and the drying acquisition technology are combined, and the soil bulk density measurement and the drying acquisition technology are combined; the consumption of biochar in saline-alkali soil at the interval of 24 hours and the soil bulk density, the water content, the pH value and the organic carbon content of the saline-alkali soil in a saline-alkali soil test area at the interval of 24 hours are accurately captured, and physical data and chemical data of the saline-alkali soil are monitored in real time.

The invention discloses a straw pre-wetting time judgment method and system, particularly relates to the technical field of agricultural waste treatment intelligent control, and is used for solving the problem of multi-target conflict between existing pre-wetting process parameters and tunnel fermentation energy consumption. The method comprises the following steps: acquiring initial moisture content and bulk density distribution data of straw in real time, identifying spatial distribution of a high-density blocking region and a low-density permeation channel in a stacking layer, and generating an effective length reflecting a moisture permeation path; generating a pre-wetting time reference value based on dynamic weight fusion of the current batch and historical pre-wetting data, and performing collaborative correction in combination with a coupling relationship between equipment idling time and ventilation energy consumption; the pre-wetting time threshold value is dynamically adjusted through a cooperative feedback mechanism of the main fiber direction of the straw stalks and the acoustic impedance characteristics of the stacking layers; finally, a termination instruction is triggered according to the continuous stable state of the surface layer moisture content and the fiber orientation, and precise balance between energy consumption and process efficiency is achieved while the pre-wetting uniformity is improved.

The invention relates to the technical field of road material engineering, in particular to an asphalt mixture gradation optimization method and device, electronic equipment and a storage medium. According to the gross volume relative density, the apparent relative density and the tamping density of each grade of aggregate, the actually measured stacking density of each grade of aggregate is calculated; on the premise of ensuring that the pre-estimated void ratio, the pre-estimated asphalt saturation and the pre-estimated mineral aggregate void ratio meet the target requirements, in the standard grading range and the parameter value range of the Bailey method, the maximum pre-estimated stacking density, the maximum pre-estimated mineral aggregate void ratio and the minimum pre-estimated asphalt-aggregate ratio are used as target functions, grading iterative optimization is carried out by utilizing a multi-target particle swarm algorithm, and the maximum pre-estimated stacking density, the maximum pre-estimated mineral aggregate void ratio and the minimum pre-estimated asphalt-aggregate ratio are obtained. The Pareto solution of the optimized gradation is obtained; analyzing the Pareto solution of the optimized gradation, and selecting a plurality of groups of optimized gradation according to the principle of minimum asphalt-aggregate ratio. According to the method, the economical efficiency and the success rate of grading optimization of the asphalt mixture are improved.

The invention discloses graded metal powder for cold metal fusion additive manufacturing, which is characterized in that metal powder with different particle sizes is graded to form multimodal particle size distribution powder, and the metal powder with different particle sizes is compounded in a gap filling manner; multi-peak particle size distribution powder obtained by grading metal powder of various particle sizes balances the fluidity and the stacking density, the metal powder of different particle sizes can be subjected to gap filling, for example, coarse particle powder dominates the fluidity, the CMF powder laying uniformity is ensured, gaps of the coarse particle powder are filled with medium particle powder, and the CMF powder laying uniformity is ensured. And then superfine particle powder is adopted to fill the remaining gaps, the superfine particle powder provides a high specific surface area, and the sintering driving force is improved. Compared with single powder, the tap density obtained through powder grading is increased by more than 10%. And the CMF process can be well adapted through the graded metal powder, the thickness of a powder laying layer can be better matched, and interlayer dislocation is avoided.