1462results about "Material weighing" patented technology

The invention discloses a seed quality evaluation system and device based on multi-modal data fusion and a control method, and relates to the technical field of agricultural engineering. The system comprises a data acquisition module, a data processing module, a quality evaluation module and a control module. The data acquisition module acquires multi-modal data; the data processing module performs preprocessing, feature extraction and fusion on the multi-modal data to generate a comprehensive feature vector; the quality evaluation module performs seed quality evaluation based on the comprehensive feature vector by using a machine learning model; the control module controls all the modules to operate and outputs results. The device comprises a closed box body, a temperature and humidity control unit, an electronic scale, a hyperspectral imaging unit, a visible light imaging unit, a mechanical arm and a main control unit. The method realizes rapid, accurate, lossless and automatic evaluation of seed quality, overcomes the defects of low efficiency, strong subjectivity, easy damage of seeds and the like in a traditional method, and improves the accuracy and efficiency of seed quality evaluation.

The invention relates to the technical field of automatic sorting of agricultural products, in particular to an egg quality intelligent sorting system and method based on multi-modal sensing. The system comprises a multi-mode sensing module, a data processing module and a sorting execution module. The multi-mode sensing module integrates a hyperspectral imaging unit, a voiceprint vibration detection unit and a weight sensing unit, and comprehensively collects egg surface images, vibration frequency and weight data; the data processing module analyzes the image data through deep learning and a data fusion algorithm to detect cracks and blood spots, and fuses multi-modal data to generate features to adapt to characteristic changes of different batches of eggs; the sorting execution module determines the sorting priority according to the fusion features and executes accurate sorting; the system utilizes the synergistic effect of the multi-mode sensing technology to comprehensively evaluate the internal and external quality of eggs, the detection precision is remarkably improved, efficient and intelligent egg sorting is realized, and the automatic sorting technology level of agricultural products is improved.

The invention provides a grain impurity rate and breakage rate monitoring system and method for a combine harvester. The grain impurity rate and breakage rate monitoring system comprises a grain sampling device, an image acquisition device and a control device, the grain sampling device is installed on the side wall of the vertical grain conveying barrel, a grain inlet of the grain sampling device is connected with a grain outlet hole in the side wall of the vertical grain conveying barrel through a hose, and a grain outlet of the grain sampling device is connected with a feeding port of the image acquisition device through a connecting pipe; the image acquisition device is connected with the control device, an image acquisition module of the control device controls the image acquisition device to acquire a grain image, and online calculation of the impurity rate and the breakage rate of the grain is realized on the grain image through a YOLOv8-Seg instance segmentation model of the image processing module in combination with an impurity rate and breakage rate mathematical model; finally, a detection result is displayed on a display screen in real time, visual numerical values can be provided for an operator of the combine harvester, and the operator is helped to adjust working parameters of the harvester. The method can be used for harvesting rice, wheat, oilseed rape and soybeans, and has wide applicability.

The invention discloses a smoke concentration detection method and device, a storage medium and a program product, and relates to the field of concentration detection.The method comprises the steps that the target environment temperature and the target environment humidity of a target sampling point and the target morphological parameters, the target initial mass and the target sampling volume of target smoke particles are obtained; according to the target morphological parameters and a preset morphological parameter-mass increment corresponding table, determining different mass increments corresponding to the target smoke particles at different environment temperatures and different environment humidity; determining a target mass increment of the target smoke particles based on the target environment temperature and the target environment humidity; according to the target initial mass and the target mass increment, target final mass of the target smoke particles is determined; and dividing the target final mass by the target sampling volume to obtain the target smoke dust concentration of the target smoke dust particles. By implementing the method, the accuracy of smoke concentration detection is improved.

The utility model provides a hydropower station unit internal environment anti-condensation simulation test device, which comprises a temperature and humidity control environment box and a temperature-controllable circulating water tank, a cooling-water machine refrigerates water in the temperature-controllable circulating water tank, and two ends of the temperature and humidity control environment box are provided with a water inlet and a water outlet which are communicated with a test bearing water pipe. The temperature-controllable circulating water tank is connected with the water inlet and the water outlet through a water supply pipeline, the water supply pipeline is provided with a water pump, the outer side of the test bearing water pipe is provided with different test areas, the different test areas are coated with different anti-condensation coating samples, an electronic balance is arranged in the temperature and humidity control environment box corresponding to the test areas, and the electronic balance is provided with a condensation collecting disc. And the temperature and humidity control environment box is placed on the vibration platform. The device can simulate the anti-condensation performance of anti-corrosion samples of different processes in different environments.

The invention provides a method and a system for evaluating the biological health condition of cultivated land soil based on exploratory factor analysis, and relates to the technical field of evaluation of the biological health condition of soil. The precise analysis of the complex interaction relationship between the soil microorganism function and the environmental factor is realized; through multi-dimensional index fusion and deep mining of a factor model, key biological function factors are effectively discriminated and quantified, and the scientific evaluation capability of soil ecological functions is improved; in combination with causal path analysis, the scheme can reveal the influence of environmental pressure on a microbial regulation and control mechanism, and intelligent attribution and traceability of abnormal health conditions are realized; based on dynamic fusion and grading judgment of function and environment scores, the scheme supports accurate health condition evaluation and hierarchical intervention, the early warning capability and decision scientificity of soil management are enhanced, and the agricultural sustainable development guarantee level is remarkably improved.

The invention discloses a measuring device and a measuring method for field runoff plot soil erosion monitoring, the device comprises a sediment measuring device, a water measuring device and a protective cover, the sediment measuring device realizes sediment filtration and weight measurement through a filter funnel and a scale, and the water measuring device accurately calculates the water amount by using a double-tipping-bucket container and a sensor. The protection cover ensures that runoff accurately enters the device. The device is also provided with a horizontal test system to ensure the measurement accuracy. The measuring method comprises two steps of preparation before work and a working process, specifically, firstly, a proper position is selected to place the device and leveled, then silt and water generated in a runoff plot are monitored, the silt is separated through the filtering funnel, the weight is measured, meanwhile, the water amount is calculated through the double-tipping-bucket container and the sensor, and finally flowing water is guided out through the drainage system, so that monitoring is completed. The device is compact in structure and simple and convenient to operate, can accurately monitor the soil erosion condition of the field runoff plot in real time, and provides powerful support for water and soil conservation and ecological environment research.

The invention discloses a rubber sealing ring performance detection device, and belongs to the field of sealing ring detection, the rubber sealing ring performance detection device comprises a rubber sealing ring detection table, the top of the rubber sealing ring detection table is provided with a segmentation detection driving unit and a segmentation detection mechanism, and the segmentation detection driving unit and the segmentation detection mechanism are respectively used for providing clamping, stretching and friction driving during rubber sealing ring segmentation detection; and detecting the tensile strength and wear resistance of the segmented rubber sealing ring. The segmented detection driving unit is arranged to be matched with the segmented detection mechanism, the rubber sealing rings can be clamped and detected in a segmented mode, the rebound pressure of the rubber sealing rings is detected based on the Newton's third law, the tensile strength of the rubber sealing rings at all positions is obtained, and the abrasion loss of the rubber sealing rings in the detection process is judged according to the abrasion loss of the rubber sealing rings in the detection process. The wear resistance of each rubber sealing ring can be known, so that whether the wear resistance and the tensile strength of the formed sealing ring are poor due to the material or subsequent injection molding and hot melting forming can be known, and the effect of accurately analyzing the detection result can be achieved.

The invention discloses a real-time monitoring device and method for soil disintegration air escape amount and cement dissolution rate. The real-time monitoring device comprises a disintegration tank, the disintegration tank is arranged on a base, a water injection pipe with a valve is arranged at the top of the disintegration tank, a water drainage pipe with a valve is arranged at the bottom of the disintegration tank, and a support is arranged above the disintegration tank. The mechanical sensing unit comprises a lifting rope, a lifting hook, a gas collector, a grid plate, a first tension sensor and a second tension sensor, and the electrochemical monitoring unit comprises an anode electrode plate, a galvanometer, a switch, a direct-current power supply and a cathode electrode plate which are sequentially connected in series through wires to form a closed monitoring loop. Quantifying the dissolution rate of the cement by monitoring a current signal corresponding to the ion concentration change in the solution; the high-definition camera collects disintegration images in real time and synchronously transmits the disintegration images and sensor data to the server. According to the device, through the combined action of the mechanical sensing unit and the electrochemical monitoring unit, the limitation of single-parameter monitoring is solved, and key data support is provided for stability evaluation of geotechnical engineering.

The invention discloses a silkworm cocoon porosity testing device and method, and relates to the technical field of textile material detection. The device comprises a fixed support, the inner wall of the fixed support is fixedly connected with a test cylinder, the top of a transverse plate of the fixed support is fixedly connected with a recoverer, the outer wall of the test cylinder is fixedly connected with an ultrasonic oscillator, and the outer wall of the test cylinder is fixedly connected with a water return pipe. Through cooperation of the test cylinder, the water return pipe, the recoverer, an ultrasonic oscillator, a first motor, a first threaded rod, an L-shaped plate, a first threaded sleeve, a connecting plate, a moving block, a vertical rod, a placement disc, a first spring, an L-shaped short plate, a concentric-square-shaped block, a first arc block, an L-shaped long plate and a second arc block, a silkworm cocoon sample box shakes back and forth and is matched with a cavitation effect formed by high-frequency mechanical oscillation generated by ultrasonic waves; the silk on the silkworm cocoons and the distilled water can be wetted and permeated more quickly and fully, so that the reaction rate of the silk on the wet silkworm cocoons and the distilled water is increased.

The invention belongs to the technical field of TG-DSC testing of metal powder materials, and particularly relates to an anti-oxidation high-precision TG-DSC testing method of high-temperature alloy powder, which comprises the following steps: placing the high-temperature alloy powder in a furnace body of a TG-DSC instrument, carrying out high-purity argon replacement on the atmosphere in the furnace body by taking high-purity argon as furnace body purging gas, and carrying out high-purity argon replacement on the atmosphere in the furnace body; the initial oxygen content in the furnace body is reduced to 0.1 ppm or below; continuously introducing hydrogen-argon mixed gas as flowing gas into the furnace body, controlling the temperature of the furnace body to be increased to a target temperature, and ending the test to obtain a TG curve and a DSC curve of the to-be-tested high-temperature alloy powder; according to the invention, through physical cleaning of oxygen in the furnace body by circulating vacuumizing before testing and chemical cleaning of oxygen permeating into the furnace body by hydrogen-argon mixed gas in the whole process in the testing process, a dual anti-oxidation barrier is constructed, so that oxidation weight increment and oxidation heat release interference of a powder sample are eliminated fundamentally; therefore, the real mass change and the heat flow signal change of the alloy powder sample in the temperature programming process can be accurately measured.

The invention provides a method for testing breakage of a film covered wire. The method comprises the following steps of: 1, respectively sampling a section of a wire with the length of 1m and a section of a wire with the length of 10m; step 2, respectively measuring weight values and direct-current resistance values of the 1-meter sampling line and the 10-meter sampling line to obtain a weight value G1 of the 1-meter sampling line, a direct-current resistance value R1 of the 1-meter sampling line, a weight value G2 of the 10-meter sampling line and a direct-current resistance value R2 of the 10-meter sampling line; step 3, calculating the direct current resistance change rate according to a formula delta R = {R2 / [R1 * (G2 / G1)]-1} * 100%; 4, when the direct-current resistance change rate delta R is smaller than a set percentage, the wire is judged to be qualified; and when the direct-current resistance change rate delta R is greater than or equal to a set percentage, judging that the wire has the wire breakage defect. According to the invention, the resistance abnormity caused by broken line and non-broken line factors can be effectively distinguished, and the misjudgment rate is reduced; and meanwhile, quantitative line breakage degree evaluation can be realized, and a technical basis is provided for formulating an industrial line breakage detection standard.

The invention belongs to the field of dust production characteristic research of coal mining machines in coal mines, and relates to a device and method for researching coal breaking dust production characteristics of cutting picks, the device comprises a dustproof shell, a coal sample restraint device, the cutting picks, a counterweight and lifting system, a pressurization system and the like, and the dust production amount and particle size distribution are accurately measured by simulating the coal breaking process of the cutting picks under different working conditions. The experiment method comprises the steps of sample preparation, device arrangement, experiment operation, data acquisition and processing and the like, and the experiment accuracy is ensured by utilizing the secondary impact prevention lock. According to the method, dust production influence factors can be effectively analyzed, a dust generation mechanism is disclosed, a basis is provided for coal cutter design and operation parameter optimization, an effective dust control strategy is formulated, and an operation environment is improved.

The invention relates to a device and a method for measuring concrete volume change caused by long-term neutron irradiation, the device comprises a neutron emitter and a neutron receiver which are arranged in a laboratory in a matching manner, a test concrete test piece is fixed between the neutron emitter and the neutron receiver, and the test concrete test piece measures the temperature through a temperature detector; a contrast concrete test piece is arranged in the test chamber, a collection mold wraps the outer side of the contrast concrete test piece, and a condensation pipe, a water vapor collector and a high-precision electronic scale are arranged. The method comprises the following steps: 1, measuring the overall expansion rate of a concrete test piece through a strain measurer; 2, testing the volume change of the concrete test piece in the environment; 3, calculating the volume change rate of the concrete caused by neutron radiation by combining the thermal expansion coefficient of the concrete and the drying shrinkage of the concrete; and 4, the relationship between the volume expansion rate of the concrete and the neutron irradiation dose is tested, and the relationship between the volume change rate of the shielding concrete of the engineering structure and the time is speculated, so that the safety of the nuclear engineering structure is ensured.

The invention belongs to the technical field of geotechnical engineering sludge solidification, and particularly relates to an integrated test system and method for solidifying and repairing polluted bottom mud through vacuum electroosmosis. According to the method, the change of the water content and the electric conductivity of the polluted bottom mud in the electroosmosis treatment process can be monitored in real time, and the change of the pollution concentration of the polluted bottom mud can be calculated in real time according to the change of the water content and the electric conductivity, so that the problems that a traditional test method needs sampling detection, steps are tedious and a result cannot be obtained in real time are solved; no special equipment is needed for measuring the concentration and the moisture content of the pollutants, so that the cost is saved; pollutants in the polluted bottom mud are discharged into the water collecting assembly along with sewage, so that the decontamination effect is ensured; the polluted bottom mud in the mud inlet assembly is sucked into the vacuum container through the negative pressure assembly, so that the uniformity of the polluted bottom mud is ensured; along with the proceeding of the test, the vacuum container compresses the polluted bottom mud, so that the vacuum electroosmosis dehydration and decontamination process is accelerated.

The invention relates to the technical field of coal underground gasification, and discloses an in-situ UCG process coal body stripping dynamic monitoring physical simulation device and method.A sealed first cavity is formed in an outer bin, and an extraction opening and a first injection opening communicating with the first cavity are formed in the outer bin; a semi-open second cavity is formed in the inner bin, and coal is placed in the second cavity; the horizontal mechanism is arranged on the outer bin and connected with the inner bin; the pressurizing mechanisms are arranged on the inner bin and used for pressurizing the coal body in the horizontal direction and the vertical direction; the weight collecting mechanism is arranged at the bottom of the first cavity, and the open end of the second cavity faces the weight collecting mechanism; according to the coal body stripping characteristic monitoring device, the coal body stripping characteristic in the coal underground gasification process can be monitored in real time, and the control effect of a coal composition on stripping can be analyzed by combining a coal composition and structure space characteristic characterization technology.

The invention provides a karst stratum rock groutability test analysis method, device, equipment and medium, and relates to the technical field of mine water disaster prevention and control, and the method comprises the steps: obtaining a rock core sample, and obtaining a to-be-grouted rock sample and first pore information of the to-be-grouted rock sample before grouting; the method comprises the following steps: acquiring a first weight and a rock sample length of a to-be-grouted rock sample before grouting, performing a grouting test and slurry initial setting on the to-be-grouted rock sample to obtain a grouted rock sample, and acquiring a second weight of the grouted rock sample; based on the first weight, the rock sample length and the second weight, the linear meter grouting amount of the rock sample to be grouted is determined; acquiring second pore information of the grouted rock sample; and evaluating the groutability of the karst stratum based on the first pore information, the second pore information and the linear meter grouting amount. According to the method, advanced research on the groutability of the target governance layer is realized, and a scientific basis is provided for subsequent ground area governance scheme design, project amount, grouting amount prediction and governance effect verification and evaluation.

The invention discloses a dry-method electrode film rolling compounding method and dry-method electrode film rolling equipment. The method comprises the following steps: leading out a current collector film from an unpowered unreeling shaft, forming a suspension arc by virtue of self weight, and penetrating through a first roller gap; synchronously unrolling the two dry-method electrode films in an unpowered manner, so that the two dry-method electrode films enter the first roller gap in a self-weight overhanging state and are attached to the two surfaces of the current collector film to form an initial complex; coating the outer side of the initial complex with an isolating membrane to obtain a to-be-heated complex, and enabling the to-be-heated complex to enter a second roller gap after the to-be-heated complex is overhung by self weight; the to-be-heated composite body is subjected to hot-pressing compounding through compounding rollers on the two sides of the second roller gap; and then stripping the isolating membrane and rolling the double-sided dry-method pole piece. According to the method, near-zero tension conveying is achieved through natural suspension, and by matching with isolation film wrapping and one-time double-face pressing of the hot-pressing roller, edge micro-cracking and whole belt breakage of the dry-method electrode film can be effectively avoided, and the interface density and the roll-to-roll production yield are improved.

The invention discloses a fire extinguishing water spraying intensity detection method for propellant fire in the field of propellant fire extinguishing. A superspeed deluge system, an ignition system, a charging device and a weighing device are included. The ultra-high-speed deluge system comprises a high-speed detector, a control system, a quick opening valve, a sprinkler head, a water supply pipe, a pressure water supply device and an air supply device; the ignition system comprises a resistance wire, an ignition circuit and an ignition device.The fire extinguishing water spraying intensity detection method for the propellant fire is provided for solving the problems that the propellant fire cannot be extinguished through the water spraying intensity of an existing deluge system, and an ultra-high-speed deluge system cannot be effectively applied to a propellant production site. The problem that an existing propellant powder production place does not have a key parameter of fire extinguishing water spraying intensity is solved, effective application of the ultra-high-speed rain extinguishing technology in the propellant powder production place is achieved, and safety of production personnel and equipment is protected.

The invention discloses a preparation and quality detection device and method for uniformly layered granular materials with different compactness, and belongs to the technical field of geotechnical test equipment.The device comprises a receiving container arranged on an inner supporting frame, the receiving container is connected with a diffuser through a control valve, and a miniature CPT device is arranged between the diffuser and the inner supporting frame; the top of the receiving container is connected with a hopper through a flexible hose, and the hopper is arranged on the top of the outer supporting frame. A porous plate structure in the diffuser is used for controlling the deposition strength, particle distribution is monitored through a micro pressure sensor and a high-speed camera, the aperture is adjusted, multi-dimensional characteristic in-situ detection is achieved by means of multiple sensors of a micro CPT device, and parameters are optimized and optimal deposition parameters are predicted through a controller. According to the preparation and quality detection device and detection method for the layered uniform granular materials with the different compactness, the deposition strength and particle distribution can be accurately controlled, multi-dimensional detection and automatic control are achieved, the test precision and efficiency are improved, and manual errors are reduced.

The invention relates to the technical field of PVD coating detection, in particular to a PVD coating detection device which comprises a friction testing machine shell, a precision electronic scale and a friction mechanism arranged on the friction testing machine shell, the side wall of the friction testing machine shell is fixedly connected with a T-shaped base, and the top of the T-shaped base is fixedly connected with a heightening table. The precision electronic scale is fixedly connected to the top end of the heightening table, an outlet is formed in the side wall of the friction testing machine shell, an L-shaped plate is fixedly connected to the inner side of the outlet, a sliding plate is transversely and slidably connected to the inner side of the L-shaped plate, and a top plate is longitudinally and slidably connected to the side wall of the sliding plate. A test block weighed on the precision electronic scale can be automatically placed on the friction mechanism to be tested, and the test block can be placed back to the precision electronic scale to be weighed after the test is finished, so that the test block does not need to be repeatedly disassembled by detection personnel, and the convenience performance of the device is greatly improved.

The invention belongs to the technical field of edible vegetable oil quality analysis, and discloses a construction method of a step-by-step temperature compensation model for thermal oxidation rapeseed oil quality detection based on an ultrasonic diagnosis technology. The invention aims to solve the problem that the environment temperature change can influence the sound wave pulse signal when the rapeseed oil quality is detected by utilizing an ultrasonic diagnosis technology. According to the method, a plurality of partial least squares (PLSR) or random forest method (RF) models are respectively established by adopting each integer temperature in a temperature range of 22-32 DEG C and correspondingly acquired ultrasonic data parameters in combination with physical and chemical data parameters acquired at the temperature; the prediction pertinence and accuracy of the temperature compensation model are improved in a mode of constructing a plurality of sub-models, and meanwhile, a training set, an internal verification set and an external verification set are introduced to perform multiple verification evaluation on the model, so that the prediction performance and stability of the model are ensured, and a quality index prediction value output by the model is closer to an actual quality index; and the accuracy and effectiveness of detection data are ensured.

The invention provides a seed detection method, system and device based on a multi-modal intelligent algorithm. The method comprises the following steps: acquiring a raster image of a to-be-detected seed; rGB-D modal information of the raster image is collected; cutting an edge part in the raster image, and matching the cut image with the RGB-D modal information; performing target detection on the image by adopting a detection algorithm to determine a detection area of the seed in the image; establishing three-dimensional point cloud data according to the RGB-D modal information of the pixel points in the detection area; segmenting the three-dimensional point cloud data into point cloud data corresponding to each seed by adopting an adaptive density clustering algorithm; calculating volume data of each seed by using a point cloud convex hull algorithm according to the point cloud data; and clustering all volume data into real grain data and shriveled grain data by adopting a K-means clustering algorithm. According to the method disclosed by the invention, nondestructive seed test detection of the seeds is realized by adopting a multi-modal detection technology, and detection with higher precision is realized.

The utility model discloses a drainage liquid monitoring device which comprises a shell with a containing chamber, and the containing chamber can bear a drainage instrument. The image acquisition module is used for periodically acquiring the color and transparency of drainage liquid and is embedded in the inner wall of the shell; the weighing module is used for monitoring the increase rate of the drainage liquid in unit time in real time and is arranged at the bottom of the accommodating chamber; the microprocessor is used for receiving and analyzing data of the image acquisition module and the weighing module and is arranged at the bottom of the shell; and the audible and visual alarm is exposed on the outer surface of the shell, and the audible and visual alarm is electrically connected with the microprocessor. Through the image acquisition module and the weighing module, the color and transparency of the drainage liquid in the drainage instrument and the increase rate of the drainage liquid in unit time are monitored in real time, an alarm is given to medical staff in time through the audible and visual alarm under abnormal conditions, and the dangerous situation of postoperative massive hemorrhage can be found in time.

The embodiment of the invention provides a method and system for measuring the content of needle-sheet pea gravels based on image processing, and the method comprises the steps: obtaining a plurality of pea gravels, cleaning and drying the obtained pea gravels, weighing the pea gravels, and recording the initial weight of the pea gravels; placing the processed pea gravels on a glass plate which is spliced into a step shape, projecting the pea gravels on the glass plate in three different directions, respectively shooting the projections in the three different directions by using an industrial camera, and acquiring projection images; the collected projection image is imported into image analysis software for image analysis, and the measurement size of the pea gravel in the projection image is obtained; screening the sizes of the pea gravels based on a preset size threshold value, selecting needle-sheet-shaped pea gravels, and weighing the screened needle-sheet-shaped pea gravels to obtain an actual weight; and calculating the ratio of the actual weight to the initial weight to obtain the actual content of the acicular pea gravel.

The invention provides a bituminous coal caking index full-process detection system based on a mechanical arm and a use method thereof, which can realize the operation of the whole bituminous coal caking index detection process from blanking weighing to crucible testing and then cleaning and recycling through the mechanical arm, and can liberate laboratory technicians from a tedious, monotonous and harmful working environment. And intelligent, unmanned, specialized, technical and standardized caking index detection and inspection service is realized. The system comprises a blanking weighing module used for placing quantitative samples into a crucible; the bonding pre-treatment and post-treatment module is used for treating samples before and after coking; the high-temperature furnace module is used for performing high-temperature coking treatment on the sample; the mechanical arm is used for clamping a crucible or a crucible holder and circulating among the blanking weighing module, the bonding pretreatment and aftertreatment module, the high-temperature furnace module, the bonding rotary drum tester module, the cooling module and the cleaning module.

The invention provides a method and device for measuring the photosynthetic rate of plant leaves based on C13 isotope labeling, and belongs to the technical field of biology. The method comprises the following steps: putting a to-be-detected leaf into an assimilation leaf chamber, marking the to-be-detected leaf with 13CO2, measuring the change of 13C content of a specific leaf part before and after marking through an element analyzer and a stable isotope proportion mass spectrometer, and calculating the assimilation 13C amount of the leaf part in unit area and unit time, namely the photosynthetic rate. According to the method and the device, the photosynthetic rates of a plurality of parts on the blade can be measured at the same time, and the measurement efficiency is greatly improved.

The invention discloses a device and method for simulating the freezing and thawing cycle process of collapsible loess in the natural environment, and belongs to the technical field of geotechnical engineering.The device comprises a test box provided with a sample groove, a rainfall simulation system is arranged on the upper portion in the test box, an underground water seepage simulation system is arranged on the lower portion in the test box, and the sample groove is connected with a loading system; a weighing system is arranged at the bottom in the test box, the weighing system is connected with an underground water seepage simulation system, a settlement and internal damage monitoring system is arranged between the weighing system and the rainfall simulation system, and a freezing and thawing circulation system is arranged on the inner side wall of the test box. According to the invention, the natural environment of the loess plateau area can be simulated, and the strength change of the strong salinized soil in the dry-wet process can be tested and researched under the combined action of various factors such as rainfall, load, underground water seepage and freeze-thaw cycle.

The invention relates to the technical field of lithium iron phosphate material detection, in particular to a method for detecting the content of fragment carbon in a lithium iron phosphate positive electrode material, which comprises the following steps: dispersing the lithium iron phosphate positive electrode material in a solvent to obtain a dispersion liquid, and standing the dispersion liquid; the dispersion liquid obtained after standing treatment is taken from the upper layer according to 30-60% of the total volume of the dispersion liquid and dried, the mass of the dried material is M1, and the carbon content is C1; the remaining dispersion liquid is dried, the mass of the dried material is M2, and the carbon content is C2; and calculating and obtaining the fragment carbon content in the lithium iron phosphate positive electrode material according to a formula: (C1-C2) * M1 / (M1 + M2). According to the method, multiple factors in the detection process are explored, and the formula is designed, so that the content of the fragment carbon in the lithium iron phosphate material can be rapidly detected.

The invention discloses a method for determining the content of lithium sulfide based on a gravimetric method, and belongs to the field of battery material detection. The invention discloses a method for determining the content of lithium sulfide based on a gravimetric method. The method comprises the following steps: A, oxidizing lithium sulfide into lithium sulfate at high temperature; b, converting lithium sulfate into barium sulfate precipitate; c, burning the precipitate at high temperature and keeping the weight constant; and D, calculating the content of lithium sulfide according to barium sulfate. According to the method, the content of lithium sulfide is measured through a gravimetric method, the problem that the content of lithium sulfide cannot be accurately measured in the industry is solved, and the method is easy to operate, high in accuracy, good in precision and safer.