47results about How to "Avoid sampling error" patented technology

The invention relates to a sampling device for soil monitoring, and belongs to the technical field of soil monitoring. The sampling device for the soil monitoring comprises a machine frame; sliding rails are mounted in the machine frame; a sliding plate is arranged on the sliding rails; the sliding plate is provided with a hydraulic driving device and a rotating motor; a screw rod with a drill bitis mounted at the lower end of the rotating motor; an annular post is mounted outside the screw rod; a cutter head is mounted at the lower end of the annular post. According to the sampling device for soil monitoring, the pressure of the annular post entering soil is greatly reduced by matching the screw rod with the drill bit with the rotating motor and the hydraulic driving device; the samplingspeed and the sampling depth are improved; through an electric telescopic rod and a sampler which is rotationally connected with the electric telescopic rod, the required soil at various depths can be taken out at one time conveniently; the sampling error caused by mutual contaminating of the soil at different depths is avoided; and the work efficiency is improved.

The invention discloses a computer generated hologram fast generation method for 3D models, comprising: translating and rotating a triangular patch in world coordinate system to standard position, and synchronously doing same transformation on the computer generated hologram, to hold the relative position between the triangular patches in the computer generated hologram and the object face, after the coordinate transformation of the triangular path; deriving Fresnel diffraction integral equation to obtain the relationship between the optical field at one point and the optical field at the top point of the triangular patch in the computer generated hologram; adding the coordinate and optical field of the top point of the special triangular patch into the equation to obtain the optical field at each sampling point on the computer generated hologram. The computer generated hologram fast generation method can significantly reduce calculation amount, avoid sampling error on object face and generate computer generated holograms of various resolutions.

The invention discloses a device and method for detecting heated coke formation propensity of a solid heavy raw material. The device comprises a sealed box. A sample pool is arranged in the sealed box. A heater for heating the sample pool is arranged outside the sample pool. A suspended heating device for providing heat for the solid heavy raw material is arranged in the sample pool. A sleeve for adsorbing coke particles is arranged outside the heating device. The top of the sleeve is connected with a weighing device. The weighing device measures the quality of the electric heating bar sleeve and the quality change, caused by reaction raw material heated coke formation, of the electric heating bar sleeve in real time. The weighing device is connected with a data collecting module which is connected with a data processing module. The data processing module processes signals of a scale, and the percentage content of the coke amount is obtained.

The invention belongs to the technical field of environmental pollutant prevention and control, and particularly relates to a method for diagnosing the concentration level of environmental medium pollutants. The method comprises the following steps: S1, determining an environmental medium; S2, selecting pollutants to be diagnosed; S3, analyzing and diagnosing the concentration of pollutants in theenvironmental medium; S4, concluding: analyzing and summarizing the result of the concentration level of the pollutants in the environmental medium. S3 specifically comprises the following operations: S3.1, setting a data acquisition range; S3.2, determining a data acquisition rule; S3.3, sorting, merging and calculating data; S3.4, sampling data; S3.5 performing pollution level evaluation. According to the method, data with the same investigation range and the same investigation purpose are summarized, the investigation frequency and the number of investigation samples are indirectly increased, sampling errors caused by the small number of investigation samples are avoided, the accuracy of environmental pollution concentration level analysis is improved, and a manager can make a pollution prevention and control strategy easily.

The invention discloses a quantitative description method for rock integrity, and relates to the fields of engineering geology and rock mechanics. The method comprises the following steps: acquiring a sketch map of an endokinetic joint gap of a rock body through geological logging; converting the rock structure sketch map acquired in the step a into a graphic file in a digital format; covering the gap in the graphic file by using a box covering method, and acquiring the relationship between the fractal dimension of the rock body and the size and amount of box covering in combination with a fractal theory to obtain a fractional dimension of the rock body. The quantitative description method has the beneficial effects that the sketch map of the endokinetic joint gap of the rock body is converted to the digital format, and then the fractional dimension of the rock body is calculated by the box covering method and the fractal theory. Compared with field wave speed testing, the method has the advantages that sampling error can be avoided, the obtained fractional dimension is a quantitative index, a basis is laid for a corresponding relationship curve of the fractional dimension, rock integrity, rock strength and deformation through the fractional dimension, and the strength index of the rock body can be predicted.

The invention discloses a blood collection tube for inspection, which comprises a test tube body. The tube wall of the test tube body is provided with protrusions, and the protrusions are integrally formed with the test tube body and arranged at intervals on the same horizontal plane of the outer wall of the test tube body. , with at least one protrusion. In the present invention, the bottom surface of the extended wall forming a cavity is arranged at the bottom of the test tube body to paste the label, which reduces the wear and tear on the label, and at the same time avoids blocking the line of sight and affecting the sampling result when the label is attached to the test tube body.

The invention discloses a rotary uncapping type vacuum blood collection tube which comprises a test tube body and a cap. A toothed groove is formed in the middle portion or the bottom of the outer wall of the test tube body, and an inwards-concave flat tube bottom is arranged at the bottom of the test tube body and used for sticking a sample label. The rotary uncapping type vacuum blood collection tube is matched with an automatic instrument, so that the cap of the rotary uncapping type vacuum blood collection tube with negative pressure can be automatically unscrewed by a mechanical arm, the phenomenon that the test tube body is broken or samples are vibrated due to the fact that the test tube body is clamped by large force when the vacuum blood collection tube is uncapped through manpower is avoided, the sample label is pasted to the bottom of the test tube body so that errors caused by vision shielding in the sampling process can be avoided, the structure is simple, operation is convenient, various defects caused by manual operation are overcome, manufacturing cost is low, adaptability is high, and great convenience is brought to achievement of automation of sample detection.

A content analyzing apparatus is provided. A heat-insulating layer is arranged on an inner cavity wall of a straight tube housing with two opened ends; the upper wall of the housing is provided with two separated temperature sensors; a front temperature sensor is arranged on the front part of the housing and a back temperature sensor is arranged on the back part of the housing; the lower wall of the housing is provided with a heating element; the heating element is arranged between the front temperature sensor and the back temperature sensor; the internal diameter of the straight tube housing is D; the distance between the front temperature sensor and the heating element is indicated as t1, which is 0.5 to 5 times of the internal diameter D; and the distance between the back temperature sensor and the heating element is displayed as t2, which is 10 to 30 times of the internal diameter D. During the use, the content analyzing apparatus can be cooperated with a flow meter and can be applied to detection for content of multi-phase flow of oil wells and fields and to two-phase mixture metering of other industries; the content analyzing apparatus is a straight tube section, thereby having small pressure loss, so flow regime cannot be broken and the content analyzing apparatus can be conveniently installed; and the measuring and calculation values acquired by the analyzing apparatus is free of effects of pressure, so high precision is possessed.

The invention discloses a method for carrying out in-situ sampling and detection on effective state metals based on a DGT-XRF combined technology, and the effective state concentration of metals/metalloids in polluted water and soil is quantitatively obtained by combining DGT and portable XRF technologies. The method comprises the following specific steps: putting a ZrO-ChelexDGT device into a polluted water body or soil in situ, standing for 8-48 hours, synchronously enriching multiple metal elements, taking out DGT, cleaning water and soil left on the surface, and directly measuring by using a portable XRF (X-ray fluorescence) to obtain signal intensity values of the multiple metal elements on the DGT film. And performing correction according to a pre-calibrated linear curve of the indoor standard sample to obtain the effective state concentration of the metal in the water body or the soil at the sampling point. The invention relates to the technical field of environment monitoring. The method for carrying out in-situ sampling and detection on the available metal based on the DGT-XRF combined technology is simple to operate, high in sensitivity and high in analysis speed, and can realize rapid in-situ monitoring of various metal elements in polluted water areas and soil.

The invention relates to the field of circuits, and discloses a monitoring method and system for remained charge of a battery pack. The method comprises the following steps of: S1, monitoring a current state of the battery pack; when the battery pack is currently in a charged state: sampling the voltage of each single battery in the battery pack; calculating the open-drain voltage of the single battery with the smallest current voltage value in the battery pack according to a current charging current, a single battery voltage with the smallest current voltage value in the battery pack, internal resistance of the single battery; querying a mapping table; updating current remained charge percentage of the battery pack to corresponding remained charge percentage value of the open-drain voltage of the single battery with the smallest current voltage value in the battery pack in the mapping table; and returning to S1. The mapping table is pre-stored with a mapping relation between the open-drain voltage of the single battery with the smallest current voltage value in the battery pack and the current remained charge percentage value of the battery pack under a resting state of the battery pack.

The invention discloses an over-current protection circuit of a direct-current electronic contactor, which is characterized in that a drain electrode of an NMOS switching transistor is connected witha positive electrode of a direct-current power supply, and a source electrode is connected with a negative electrode of the direct-current power supply through a load; and a control signal of a single-chip microcomputer is input into a grid electrode of the NMOS switching transistor through a driving circuit. Multiple paths of the NMOS switching transistor are connected in parallel. The drain electrode of the NMOS switching transistor is connected with a non-inverting input end of a differential amplifier through a relay protection circuit and a differential resistor, the source electrode ofthe NMOS switching transistor is further connected with an inverting input end of the differential amplifier through a relay coil equivalent resistor and a differential resistor, and the output end ofthe differential amplifier is connected with an AD conversion module of the single-chip microcomputer. The driving signal controls the NMOS switching transistor to be switched on. The over-current protection circuit samples voltage at the drain electrode end and the source electrode end of the NMOS switching transistor, and when the voltage exceeds a set threshold value, over-current shutdown protection is performed. The over-current protection circuit is simple in design, the use cost of the circuit can be reduced, and the reliability and the stability of the circuit during working can be improved.

The invention discloses a constant current control circuit, a control method and a flyback circuit, when a system is in a continuous mode, the constant current control circuit controls the product of a median current of a primary side inductor and a first conduction duty ratio of a secondary side to be in a set first threshold interval; and when the system is in an interrupted mode, the constant current control circuit controls the product of half of the peak current of the primary side inductor and the second conduction duty ratio of the secondary side to be in the first threshold interval. According to the constant-current control circuit, the constant-current control method and the flyback circuit, the constant-current precision of the system working in a DCM mode of high-voltage input can be greatly improved, sampling errors caused by CS voltage waveform oscillation are avoided, and meanwhile, the influence of median sampling position deviation on the constant current of the system is also eliminated.

The invention relates to an active equalization circuit of a lithium ion storage battery monomer for carrying, and belongs to the field of ground power supplies for carrying. The circuit comprises ground charging and discharging equipment, n monomer equalization modules and n battery monomers; the n battery monomers are sequentially connected in series in a positive-negative manner to form a series circuit; the positive end and the negative end of the series circuit are communicated with the ground charging and discharging equipment; the n single balancing modules are arranged and mounted on an external connecting bottom plate; the monomer equalization modules and the battery monomers are in one-to-one correspondence to form a parallel circuit; and n parallel circuits are formed. According to the invention, the problem of monomer active equalization in the charging process of multiple strings of lithium ion monomers is solved, the characteristics of frequent ground charging and discharging and short flight task work period of the lithium ion storage battery for carrying are met, and the cycle service life of the lithium ion storage battery for carrying and the flight reliability after launching are ensured.

The invention discloses a device and a method for measuring mercury in flue gas based on low-temperature plasma pyrolysis. The device comprises a sampling unit, a pretreatment system, a mercury analyzer, a calibration unit and a data acquisition and transmission system. The sampling unit is used for collecting sampled flue gas, pyrolyzing and releasing mercury in particulate matters and mercury in an oxidation state in the flue gas during sampling, and converting the mercury and the mercury into elemental mercury; the pretreatment system is used for controlling the sampling mode of the sampling unit to be dynamic pressure tracking sampling; the mercury analyzer is used for measuring the concentration of mercury in the sample; the calibration unit is used for converting a mercury standard substance with known concentration into Hg < 0 > and then inputting the Hg < 0 > into the mercury analyzer for detection through a gas circuit; and the data acquisition and transmission system is used for acquiring, storing and transmitting data obtained by the mercury analyzer. The device has the characteristics of simple structure, rapidness and stability.

The present disclosure relates to methods of extracting DNA from urine and methods of analyzing DNA in a urine sample. Methods are provided for extracting ctDNA from a urine sample and analyzing the extracted ctDNA for mutations indicative of a disease. The disclosure also relates to compositions for use in such methods.