46results about How to "Eliminate systematic errors" patented technology

The invention discloses a fish and shellfish polyculture experiment system and a verification method, and the system comprises at least two groups of experiment units which operate independently, an intelligent water distribution unit, a water quality on-line monitoring unit, a waste automatic collection unit and a central control unit. Wherein the experiment module comprises a fish culture area, a shellfish culture area, an adjustable mainstream circulation channel and a bypass circulation loop. The verification method comprises the steps of system initialization and experiment grouping, biological putting and feeding calibration, breeding operation under a controlled condition, multi-processing-group synchronous monitoring and sampling and data analysis and efficiency comprehensive evaluation. According to the method, the experimental platform which can accurately simulate the material circulation process of the fish-shellfish polyculture system, realize synchronous comparison of multiple treatment groups and quantitatively evaluate the nutrient interstage material coupling mechanism is constructed, and a scientific basis is provided for an ecological culture mode with low emission and high resource utilization rate.

This utility model discloses a dual-mode hydrological radar measurement device based on closed-loop attitude adjustment, belonging to the field of hydrological monitoring technology. It includes a sealed electronic cabin and an attitude adjustment mechanism. A pitch angle adjustment component is located between a bottom fixed base and a rotating base, used to drive the bottom fixed base to pitch and swing horizontally. An azimuth angle adjustment component is connected between the rotating base and the top fixed base, used to drive the rotating base to rotate horizontally vertically. Through a periodic task scheduling mechanism and pre-emptive closed-loop attitude adjustment, it can automatically and cyclically switch between water level measurement mode and flow velocity measurement mode under unattended conditions. Before each measurement, the radar beam is precisely adjusted to the optimal incident angle of the corresponding mode. Simultaneously, the "attitude adjustment first, measurement later" execution logic ensures that each data acquisition is performed under optimal physical conditions, fundamentally improving the measurement accuracy of water level and flow velocity parameters and realizing fully automated continuous hydrological monitoring.

The invention relates to a high-strength aluminum alloy residual stress testing device and method in the technical field of material mechanical property testing, the high-strength aluminum alloy residual stress testing device comprises a rack, a clamping assembly used for clamping a sample and a cutting assembly used for cutting the sample are arranged on the rack, and a plurality of strain gauges are arranged in the middle of the bottom face of the sample at intervals in the cutting direction; according to the invention, the second jacking piece is arranged to apply accurate jacking force at the trisection position of the sample in the length direction, so that static deformation of the sample caused by self weight is effectively compensated, and systematic errors of the gravity on a measurement result are eliminated from the source; compared with a mode depending on follow-up algorithm compensation or tedious early-stage calibration in the prior art, the method does not need complex calculation or manual intervention, the operation process is simplified, the technical requirements for operators are reduced, a detector system is simpler and more reliable, and the repeatability and accuracy of testing are improved.

The application discloses a microseismic event positioning method based on a microseismic signal, and is characterized by comprising the following steps: S1, collecting the microseismic signal by using a microseismic collection device; the microseismic collection device comprises a plurality of three-component microseismic detectors which are arranged at equal intervals in a long drill hole and are used for collecting the microseismic signal generated by a microseismic event in a deep coal seam; the P wave and the S wave of the microseismic signal are collected simultaneously by using the microseismic collection device, and the time difference between the P wave and the S wave is used to directly provide the absolute distance from each receiver to the seismic source, so that the positioning process is converted into a spherical surface intersection problem with each receiver as a spherical center and with a calculated distance as a radius. The method not only eliminates systematic errors caused by the uncertainty of the time of earthquake occurrence, but also provides a large amount of redundant data for cross verification, so that the accuracy and reliability of the positioning result are greatly improved. The accuracy and comprehensiveness of signal collection are improved.

The application relates to the technical field of medical detection, in particular to a kit, a method and a system for predicting bacterial infection. The application provides a kit for predicting bacterial infection, which comprises an antibody combination for specifically recognizing CD64, CD14 and CD14, and the antibodies are respectively labeled with mutually distinguishable fluorescent dyes. Meanwhile, the application provides a method for predicting bacterial infection, which comprises obtaining the counts of neutrophils, lymphocytes and monocytes in a to-be-detected sample, and the fluorescent intensities of CD64 and CD14 on the cell subgroups, and calculating four characteristic parameters IDXNLR, IDXLMR, IDXCD64 and IDXCD14; and then inputting the parameters into a pre-trained infection diagnosis model to output a risk score for judging the infection state (especially bacterial infection). The model significantly improves the accuracy and specificity of distinguishing bacterial infection from non-bacterial infection (such as viral infection or healthy state) by comprehensively integrating immune parameters in multiple dimensions.

This invention discloses a method for evaluating the accuracy of surveying results based on a vehicle-mounted mobile measurement system, comprising the following steps: receiving surveying result data, determining the data acquisition area and acquisition route, and acquiring raw 3D laser point cloud data and position data; processing the raw 3D laser point cloud data and position data to obtain point cloud data and position files in the target coordinate system; constructing trajectory reference line one based on the processed position files, forming trajectory reference line two based on time interval segmentation, and forming trajectory reference line three after trajectory quality screening; loading the vector data, point cloud data, and trajectory reference lines of the surveying result sample to be inspected, automatically extracting the relative accuracy detection side length and absolute accuracy detection points, calculating the offset value with the corresponding side length and corresponding point in the surveying result to be inspected, and statistically analyzing the mean square error to achieve the mathematical accuracy evaluation of the surveying result to be inspected. This invention is highly efficient; based on the integrated acquisition of a vehicle-mounted mobile measurement system, efficiency is improved; and accuracy is reliable.

The application discloses a kind of laser calibration devices of thin-walled shell axial compression test, it is related to the technical field of axial compression test, including laser calibration instrument system, control unit, servo motor, screw adjusting mechanism and clamping mechanism;Laser calibration instrument system is integrated with clamping mechanism, control unit is respectively connected with laser calibration instrument system, servo motor, screw adjusting mechanism and clamping mechanism, realizes closed-loop control, laser calibration instrument system and clamping mechanism adopt same reference coordinate system;Clamping mechanism is used for the nondestructive positioning and locking of thin-walled shell;The clamping end surface of clamping mechanism is embedded with pressure sensor;Laser calibration instrument system is used for real-time monitoring thin-walled shell displacement and positioning deviation, cooperates control unit, servo motor and screw adjusting mechanism to complete dynamic calibration.The application can realize the high-precision positioning and calibration of composite thin-walled shell in axial compression test process, and can avoid stress concentration when the shell is clamped and fixed, realize the nondestructive clamping and locking of shell.

The invention provides a kidney transplantation rejection reaction serum polypeptide detection device and method, and the method comprises the steps: obtaining a kidney transplantation serum sample, and extracting a polypeptide characteristic signal group of the serum sample from a polypeptide mass spectrum of the serum sample in a preset mass-to-charge ratio range; the polypeptide characteristic signal group comprises three characteristic polypeptide peak signals corresponding to different protein fragments, and further determining the mass-to-charge ratio of each protein fragment and the relative intensity value of each characteristic polypeptide peak in the polypeptide characteristic signal group; carrying out fusion judgment on the rejection risk of the serum sample according to the mass-to-charge ratio of each protein fragment and the relative intensity value of each characteristic polypeptide peak in the polypeptide characteristic signal group to obtain a risk index representing the rejection state in the serum sample; and comparing the risk index with a rejection risk threshold value of the serum sample so as to make multi-level judgment on the rejection risk level to which the serum sample belongs. Based on the scheme, rejection reaction monitoring based on kidney transplantation serum polypeptide fingerprints can be realized.

The invention discloses an energy-saving optimization control method and system of an air compression station building, a medium and a product, and belongs to the field of air compression station building energy-saving control, and the method comprises the steps: collecting multi-source operation data of the air compression station building in a current sampling period; based on the multi-source operation data, the real gas consumption of the user in the current sampling period is calculated through the mass conservation relation among the gas supply amount, the gas storage variable amount and the gas consumption; inputting the real gas consumption of the user into a preset gas consumption prediction model, outputting gas consumption prediction data in future preset time, and solving to obtain gas supply distribution of each air compressor based on the gas consumption prediction data and a preset power-gas supply relation model of each air compressor; and on the basis of all the air supply distributions, an operation instruction is generated, all the air compressors are controlled to operate, and energy-saving optimization control is completed. By implementing the method, the problem that in the prior art, due to the fact that the outlet flow of the air compressor is directly adopted as the user gas consumption, gas consumption requirement recognition is not accurate can be solved.

The invention discloses an electronic terminal transfer function test system and method based on analog-to-digital conversion. Relates to the technical field of electrical testing and automatic control, in particular to an electronic terminal transfer function testing system and method based on analog-to-digital conversion. Input and output signals of a controlled object are synchronously acquired and processed, and high-precision extraction of amplitude and phase is realized by combining sine frequency sweep excitation with parameter fitting calculation, so that frequency response characteristics of a system in a target frequency band are obtained. The system comprises a main control board, an upper computer and a controlled object, one end of the main control board is connected with the upper computer, and the other end is connected with a controlled object; the upper computer is used for generating a test instruction and sending the test instruction to the main control board; the main control board is used for synchronously acquiring a test excitation signal output by the main control board and a response signal output by a controlled object; and the controlled object receives the test excitation signal output by the main control board and outputs a response signal. And the upper computer generates frequency response characteristics according to the synchronously acquired signals.

The invention relates to the technical field of medical monitoring and intelligent nursing, in particular to a cardiology department patient home nursing monitoring system and method, and the system comprises a dynamic collection module, an intelligent processing module, a safety storage module, a dynamic calibration module and an application service module. The dynamic acquisition module dynamically acquires physiological and behavior parameters of a patient and transmits the acquired parameters to the intelligent processing module; the intelligent processing module performs feature extraction, abnormity identification and illness state trend prediction, and synchronizes a processing result to the secure storage module and the application service module; the safety storage module encrypts and stores the health data of the patient, and the dynamic calibration module adjusts the calibration period of the equipment, performs automatic calibration and feeds back the calibration result to the dynamic acquisition module; and the application service module generates hierarchical intervention information and dynamically adjusts a personalized nursing scheme. Through dynamic acquisition and processing, dynamic calibration, security encryption storage and dynamic adjustment nursing, comprehensive and effective cardiology home monitoring, accurate data and reliable, accurate and safe nursing are realized.

This invention provides a method for simulating and predicting the bonding performance of an underfill adhesive, comprising: (1) modeling and optimizing the substrate material; (2) modifying the surface of the optimized substrate material; (3) modeling the monomer mixture; (4) constructing and restrictively optimizing the relaxation of a "substrate-monomer mixture-substrate" sandwich structure; (5) performing a crosslinking reaction on the sandwich structure to obtain a kinetic calculation model box; (6) acquiring kinetic data; (7) establishing a thermodynamic calculation model; (8) optimizing and relaxing the thermodynamic calculation model to obtain thermodynamic data; (9) constructing a crosslinking unit model of coupling agent, epoxy resin, and curing agent; (10) obtaining the minimum bond breaking energy; and (11) simulating and predicting the bonding performance of the underfill adhesive based on the data obtained above. The simulation and prediction method of this invention has the characteristics of high precision and high efficiency, overcoming the problems of incompleteness, low precision, and narrow applicability of existing technologies.

The application discloses a land use change detection system based on remote sensing cloud computing. The system comprises a remote sensing data acquisition module, a spectral shift compensation module, a response field construction module, a confidence evaluation module, a multi-scale segmentation optimization module and a sub-pixel boundary optimization module. The application firstly realizes accurate spectral alignment by using invariant ground feature spectral reference, then establishes a spatial confidence evaluation model through change direction consistency and amplitude dispersion analysis to filter core change pixels; and based on boundary stability and internal homogeneity, the optimal segmentation scale is automatically determined, and the change area boundary is accurately corrected through sub-pixel spectral decomposition technology, which significantly improves the reliability and accuracy of land use change detection, greatly reduces the false change detection rate, effectively enhances the boundary positioning accuracy, adapts to complex change scenes and improves the processing efficiency.

The application relates to the technical field of semiconductor detection, and provides a semiconductor temperature field detection method and device. The method comprises the following steps: point-by-point scanning of a wafer surface to obtain radiation information of each spatial position point on the wafer surface; radiation energy of different wavelengths is separated from each spatial position point in sequence according to the radiation information; radiation data of each spatial position point under multiple wavelengths is generated based on the radiation energy of each wavelength; the time sequence of the point-by-point scanning and the separation of the radiation energy of each wavelength is coordinated, so that each spatial position point matches corresponding multi-wavelength radiation data; the multi-wavelength radiation data is obtained, a radiation equation group is constructed based on the multi-wavelength radiation data of the same spatial position point, and the temperature value of each point on the wafer surface is calculated by synchronous inversion according to the radiation equation group. The application is used for the semiconductor manufacturing process, and can realize self-adaption and high-reliability non-contact detection of the surface temperature field without relying on preset parameters of emissivity.

The invention discloses a method and a system for positioning blockage of a detector in a pipeline based on array sound wave layered inversion, and belongs to the technical field of buried pipeline detection. The method comprises the following steps: performing high-precision global synchronization on an internal detector clock; the blocking state is intelligently judged, and sound wave emission is triggered; the comprehensive sound velocity of an axial pipe soil medium is inversed by using a ground axial double-point receiving signal, and coarse positioning of a blocking axial interval is realized; searching and determining a ground projection center through an energy peak value of a mobile probe; a linear receiving array perpendicular to the pipeline is arranged, and sound wave travel time data propagating in the radial direction is collected; and finally, through a linearized hyperbolic travel time equation and by utilizing least square parameter estimation, the local soil sound velocity above the blockage point and the buried depth of the inner detector are subjected to combined inversion, so that accurate three-dimensional space coordinates are obtained. According to the method, through physical layering and parameter joint inversion, the influence of nonuniform soil sound velocity uncertainty is eliminated, and sub-meter-level precision blocking positioning of the detector in the pipeline is achieved in a complex geological environment.

The invention provides a power transmission line tower grounding resistance unwiring-free measurement method and system, and belongs to the technical field of power transmission line operation maintenance and detection, and the method comprises the steps: constructing a tower equivalent loop model, employing a non-contact transformer to synchronously inject a test signal, and collecting multi-path response data, and establishing a multi-parameter complex equation set based on the Kirchhoff voltage law for solving, and finally judging the grounding resistance of the tower according to the order of magnitude relationship between the equivalent impedance and the grounding resistance. According to the invention, through the measurement method without wire releasing and auxiliary electrode bonding, the operation steps are simplified, the working efficiency is improved, personnel are prevented from working in a high-risk environment, and the working safety is improved; meanwhile, the portable design provides effective support for data real-time monitoring, online analysis and operation and maintenance decision on the basis of guaranteeing functionality, and the accuracy, efficiency and safety of power transmission line grounding resistance measurement are comprehensively optimized.

This invention discloses a high-precision method for reconstructing a directed distance field model in the field of solid rocket motor burnout calculation technology. The method includes: obtaining the directed distance field function based on a fixed mesh; reconstructing initial isosurfaces / lines using linear interpolation based on the type and spatial dimension of the fixed mesh, and marking isosurfaces / lines that make the directed distance field function zero; and obtaining and classifying the mesh nodes of the mesh cells intersecting the isosurfaces / lines obtained by searching using linear interpolation, resulting in directly adjacent nodes, a set of directly adjacent nodes, and a set of non-adjacent nodes. This invention constructs a reference base circle and uses a local optimization method to find isosurfaces / lines that are tangent to as many base circles as possible, ensuring that the directed distance field calculated based on the reconstructed isosurfaces / lines is consistent with the input directed distance field, avoiding non-physical offsets of the isosurfaces / lines, thereby eliminating systematic errors and improving calculation accuracy.

This invention discloses a rapid detection method and system for the reheating degree of meat dishes based on electrochemical sensing, belonging to the field of food testing technology. Addressing the problem of difficulty in rapidly and accurately evaluating the reheating degree of meat dishes in existing technologies, this invention first places the meat dish to be tested in a space, generating headspace gas at a preset equilibrium temperature and time. An electrochemical sensor unit collects the complete time-response curve of the interaction between the headspace gas and the sensitive layer, extracting dynamic characteristic parameters such as response rise time, peak response value, time to reach peak value, curve integral area, and half-life of the fall phase. Simultaneously, it acquires ingredient attribute parameters and reheating method parameters. These parameters are then input into a pre-trained deep learning prediction model, which outputs the reheating degree level and displays it on a display unit. This method can be used in the catering industry, food processing, and home cooking for rapid detection of the reheating degree of meat dishes, ensuring food quality and food safety.

The invention relates to a fusion positioning method and device in an open scene, electronic equipment and a storage medium, and is applied to the technical field of automatic driving, and the method comprises the steps: detecting whether a vehicle driving region is an open region or a non-open region based on point cloud data; if it is detected that the vehicle enters the open area from the non-open area, the positioning mode is switched to a positioning mode based on integrated navigation; processing the collected integrated navigation data by using the positioning mode to obtain an integrated navigation positioning result; compensating a combined navigation positioning result in real time according to a pre-counted positioning deviation between a point cloud map matching-based positioning mode and a combined navigation-based positioning mode, and taking the compensated positioning result as a final positioning result; and if it is detected that the vehicle drives from the open area to the non-open area, matching the compensated positioning result with the point cloud map, and if matching succeeds, switching the positioning mode to a positioning mode based on point cloud map matching. And stable high-precision positioning can be realized.

The application discloses a kind of based on LF-NMR combination's adsorption state and free state methane content fine characterization method, belong to unconventional natural gas exploration and development technical field.It solves the technical problem existing in the quantitative characterization means of unconventional natural gas (such as coalbed gas) reservoir methane phase state in prior art.The application utilizes the response characteristics of LF-NMR to hydrogen-containing fluid highly sensitive, real-time monitoring coal rock sample under different pressure drop gradient nuclear magnetic resonance T2 spectrum evolution characteristics, by analyzing the time-domain dynamic response of relaxation signal, constructs the kinetic response model of methane phase state division.Through setting different pressure drop rate gradient, the release signal of two phase states can be effectively separated in time domain, the application can realize the continuous, non-destructive and high-precision quantitative division of adsorbed state and free state methane content in complex reservoir, provide theoretical and technical support for accurate evaluation of deep coalbed gas reservoir gas content and efficient development scheme optimization.

The present application relates to photovoltaic array integration axis positioning control method, including the following steps: the installation position of the first stake and the tail stake of the photovoltaic array is positioned, and the first stake and the tail stake are installed respectively in the corresponding installation position;Install fixed support to the first stake and the tail stake, and install the tensile measuring rope on the top of the two fixed supports, adjust the height of the fixed support, so that the tensile measuring rope is in the preset slope;According to the preset stake spacing, mark on the tensile measuring rope, and install the plumb bob at the mark;The vertical projection of the tip of the plumb bob on the ground is installed in the middle stake;Install the fixed support on the top of the middle stake, and make the top of the fixed support connected to the tensile measuring rope;Install multiple inclination sensors on the tensile measuring rope between the first stake, the middle stake and the tail stake, and adjust the height of the fixed support on the middle stake, aiming at the same inclination data feedback by the multiple inclination sensors.

The invention discloses silica gel material heat conductivity coefficient testing equipment, and belongs to the technical field of heat conductivity coefficient testing, and the silica gel material heat conductivity coefficient testing equipment comprises a control cabinet body, the top end of the control cabinet body is provided with a protective cover, the protective cover is internally provided with a testing main body, and the protective cover is also internally provided with a drawing unit; and the drawing unit is used for assisting sample placement and automatic feeding work, and the position of the drawing unit corresponds to the position of the cold pole unit. The system has the beneficial effects that the drawing unit is arranged, the two sets of conveying units are arranged in the drawing unit, one set of conveying unit is used for placing a plurality of samples to be detected in advance, the other set of conveying unit can be used for placing the detected samples, and after one sample is tested, the system can automatically move out the detected samples; in the whole process, an operator does not need to frequently open and close the cover door, the manual intervention time of a single test is reduced to zero, and the test efficiency is greatly improved.

The invention discloses a strain fine tuning device and method for a high-temperature strain fatigue extensometer, the extensometer comprises a first high-temperature ceramic rod and a second high-temperature ceramic rod which are distributed up and down, and the strain fine tuning device comprises a clamping mechanism, comprising a first support used for being matched with a first high-temperature ceramic rod and a second support used for being matched with a second high-temperature ceramic rod, and the first support is rotationally connected with the second support; and the adjusting mechanism is used for mounting the clamping mechanism and driving the first bracket and the second bracket to relatively swing by a preset angle based on a hinge point between the first bracket and the second bracket so as to act on the first high-temperature ceramic rod and the second high-temperature ceramic rod respectively. The relative angle of the first support and the second support which are rotatably connected is slightly adjusted by the adjusting mechanism so as to act on the first high-temperature ceramic rod and / or the second high-temperature ceramic rod, so that strain fine adjustment of the extensometer in a high-temperature environment is realized, stress response distortion and average stress deviation caused by thermal expansion are solved, and life deviation is avoided.

The application discloses an adjusting device and method of a laser interferometer, and provides a hardware solution for automatic adjustment of the laser interferometer by designing a laser interferometer mounting and adjusting mechanism, combining a manual adjusting mechanism and an automatic adjusting mechanism, and detecting a laser light path through a combined first PSD position sensor and a second PSD position sensor to realize quick mounting and calibration between the laser interferometer and an interference mirror. The best direction vector of outgoing light of the laser interferometer in space is solved through least square fitting analysis on the results of multi-point position detection, so that the system error of the laser measuring system itself is eliminated, and the influence of Abbe error and cosine error on the laser measuring system is reduced.

The invention relates to the field of dispensing, and particularly discloses a high-precision continuous laser displacement height measurement detection method which comprises the following steps: S1, constructing a detection system; s2, in the continuous motion process of the motion platform, a high-speed data acquisition card synchronously acquires pulse signals of an X-axis encoder and a Y-axis encoder and analog quantity signals of a laser displacement sensor at a preset sampling frequency to obtain a synchronous position-height original data stream; s3, the upper computer PC unit screens out a height value corresponding to the target position from the original data stream according to a preset sampling strategy; the sampling strategy comprises a point mode, a line mode or a continuous acquisition mode; and S4, performing position compensation on the screened height value according to the response hysteresis characteristic of the laser displacement sensor to obtain a compensated actual height value.

The present application relates to the technical field of composite materials, and discloses a fabric composite material stiffness matrix calculation method, device, equipment and medium. The method comprises the following steps: obtaining a standard sample of a fabric composite material; determining the in-plane weaving angle alpha and the out-of-plane fluctuation angle beta of the fabric based on the standard sample; obtaining the corresponding basic mechanical parameters of the fabric composite material and the fabric layup parameters of a target component; and constructing a cross-scale numerical calculation model based on the in-plane weaving angle alpha, the out-of-plane fluctuation angle beta, the basic mechanical parameters and the fabric layup parameters, and calculating the complete stiffness matrix of the fabric composite material. The present application is suitable for various single glass fiber or carbon fiber reinforced fabric composite materials, can adjust the structure characteristic measurement points and model parameters according to different fabric types, and has good universality and expandability.

The invention provides a movable guide vane angle selection method and system based on an analytical model and simulation iteration, and belongs to the technical field of hydraulic machinery design. The technical problems that in the prior art, water pump guide vane opening design excessively depends on an empirical curve, reference lacks under extreme parameters, and CFD trial and error cost is high can be at least partially solved. The method comprises the following steps: firstly, constructing a guide vane opening analysis model based on a fluid dynamic mechanism, and directly calculating a theoretical initial value of the guide vane opening by utilizing geometric parameters, unit parameters and target efficiency of design working condition points; inputting the initial value as a boundary condition into a CFD simulation environment, and calculating the relative deviation between the efficiency under the actual flow field and the lift of the runner inlet water pump; and finally, according to the efficiency error and the water pump lift relative deviation, the guide vane opening degree is dynamically adjusted through a preset correction function, and closed-loop iteration is conducted to meet the convergence condition. According to the method, the rapidity of a mechanism model and the high precision of numerical simulation are organically combined, and the research and development period of water pump hydraulic design is remarkably shortened.

The application discloses a tumor driving gene super-sensitive quantitative detection method based on digital PCR and belongs to the technical field of tumor gene detection in molecular biology. The application realizes accurate calculation of the average number of molecules in a microdroplet, the absolute concentration of nucleic acid and the frequency of variant alleles by means of directional pretreatment of clinical samples, targeted nucleic acid purification, multiple chemical modification of tumor driving gene primers and probes, microfluidic vibration atomization nanoscale microdroplet partitioning, six-color fluorescence channel multiple digital PCR amplification and machine learning assisted microdroplet intelligent typing. The application breaks through the bottleneck of existing digital PCR detection technology, avoids conventional processes and algorithms, realizes 0.001% VAF super-sensitive detection, has a quantitative relative deviation of less than or equal to 1%, simultaneously detects eight driving genes in a single tube, is suitable for multiple clinical samples such as plasma, FFPE tissue and body fluid, and is excellent in detection sensitivity, specificity and repeatability, and is suitable for early tumor screening, efficacy monitoring, recurrence early warning and targeted drug guidance.

This application discloses an online resistance measurement circuit for a Kelvin bridge heater used in a temperature control system, relating to the field of online heater resistance measurement. The circuit includes a constant current source excitation module that outputs a DC measurement excitation current; a Kelvin four-wire connection interface; a bridge balancing and signal conditioning module that outputs a differential voltage signal proportional to the resistance change of the heater under test; an analog-to-digital conversion module that converts the differential voltage signal into a digital sampling signal; an online measurement control module that controls the overall measurement timing, acquires the digital sampling signal, performs resistance value calculation, and outputs the digital resistance measurement result of the heater under test; and a constant current source excitation module that provides excitation current to the heater under test during the measurement window within the heating cycle of the temperature control system, thereby enabling resistance measurement of the heater under test under normal operating conditions. Through this circuit, high-precision, low-interference online resistance measurement is achieved under normal heater operating conditions.

This invention relates to the field of GDMS sample preparation technology, and particularly to a pretreatment method for enriching high-purity graphite powder for GDMS. The method includes: Step 1, oxidation enrichment treatment: Weigh 300±5g of high-purity graphite powder and evenly spread it in a high-purity quartz crucible. Place the quartz crucible in a muffle furnace, keeping the furnace door open, and then heat it in two stages: ① First stage: When the temperature reaches 750℃~800℃, start the oxygen generator and control the oxygen flow rate to ≤10L / min; ② Second stage: Continue heating to 950℃±20℃, adjusting the oxygen flow rate to ≤20L / min to accelerate the oxidation reaction. After the reaction is complete, stop the oxygen supply, remove the quartz crucible, and cool it to room temperature. Step 2, weigh and collect; Step 3, mix and label; Step 4, GDMS detection. This invention achieves pollution-free pretreatment through the pretreatment device, improving the enrichment degree of the sample; and improves the accuracy of the impurity content results by performing GDMS testing on the impurities in the enriched high-purity graphite powder sample.