33results about How to "Accurate concentration" patented technology

The embodiment of the invention provides a high-temperature and high-humidity flue gas generation device. A first carrier gas pipeline is provided with a first carrier gas flow controller and a permeation humidification module; the standard gas pipeline is provided with a standard gas flow controller; the second carrier gas pipeline is provided with a second carrier gas flow controller; the output ends of the first carrier gas pipeline and the standard gas pipeline are communicated with the input end of the gas mixing pipe; the output end of the gas mixing pipe is communicated with the input end of the target gas pipeline; a water bath temperature control part of the permeation humidification module heats the carrier gas to a first target temperature, wherein the first target temperature is close to the upper limit of the working temperature range of the dew-point instrument; a target gas temperature control part on the target gas pipeline heats the target gas to a second target temperature higher than the first target temperature; the control module is used for controlling the first carrier gas flow controller to convey carrier gas with fixed flow, adjusting the carrier gas flow conveyed by the second carrier gas flow controller and adjusting the standard gas flow conveyed by the standard gas flow controller so as to adjust the humidity and the concentration of target gas.

The invention provides a gas infrared cross detection system and a detection method, and belongs to the technical field of gas detection. A first detection channel and a second detection channel are arranged in a cavity in parallel at an interval. The first photoacoustic receiving module converts a first photoacoustic signal generated in the first detection channel into a first electric signal. The second photoacoustic receiving module converts a second photoacoustic signal generated in the second detection channel into a second electric signal. The first signal processing module filters and amplifies the first electric signal to obtain a first detection signal. The second signal processing module filters and amplifies the second electric signal to obtain a second detection signal. And the differential amplification module performs differential amplification on the first detection signal and the second detection signal to obtain a concentration detection signal, so that the purpose of differential noise reduction is achieved, and a target signal is enhanced. The main control module determines the concentration of the detected gas according to the concentration detection signal, so that the concentration detection precision is improved, and the problem of low detection accuracy in the traditional technology is solved.

The invention discloses a radiotherapy system, an auxiliary system and method for evaluating free radical damage and application thereof, a tube body of a cuvette of the auxiliary system comprises side surfaces, a top surface and a bottom surface, the top surface is provided with an opening matched with a shading cover, and the side surfaces comprise a first side surface, a second side surface, a third side surface and a fourth side surface; one end of the first optical fiber is connected with the laser assembly, and the other end of the first optical fiber is connected with the first side surface; the irradiation assembly is arranged on one side of the top surface; the fluorescent light filter is arranged on the third side surface or the fourth side surface; one end of the second fiber is connected with the fluorescent filter, and the other end of the second fiber is connected with the luminosity assembly; the chamber is used for accommodating the cuvette and the fluorescent light filter; for FLASH radiotherapy, the real-time accurate detection of the fluorescence intensity can be realized by optimizing the detection environment, and a reliable platform is provided for free radical damage assessment.

The invention belongs to the technical field of source tracing of pollution sources, and particularly relates to a heavy metal pollution source tracing method based on artificial intelligence. Carrying out abnormal value processing and standardization on the collected heavy metal concentration detection data, carrying out terrain segmentation and feature extraction on terrain data, and carrying out spatial interpolation and time pairing on rainfall data; the data dimension is further enriched by acquiring historical pollution event records and wind speed and wind direction data and constructing interaction characteristics of rainfall and gradient. Then, the processed multi-dimensional feature matrix is input into the trained prediction model to obtain accurate heavy metal concentration and spatial distribution features, and finally, the position of the pollution source is deduced by adopting a Bayesian reverse modeling method, so that accurate tracing of the heavy metal pollution source is realized, the accuracy and reliability of a tracing result are improved, and the method is suitable for popularization and application. The technical problem that a tracing result in a traditional method is not scientific and systematic enough is effectively solved.

The invention is suitable for the technical field of automobiles, and provides a carbon tank flushing control method and device, a vehicle-mounted controller and a vehicle. Determining the working condition of the engine based on the parameter information; if the working condition is the steady-state working condition, carbon tank washing operation is executed; and if the working condition is the dynamic working condition, the carbon tank washing operation is not executed. According to the method and the device, the carbon tank flushing operation is executed only when the engine works under the steady-state working condition, so that the determined carbon tank oil-gas concentration during carbon tank flushing is more accurate, and the problems of unstable idling and even flameout during flushing due to the fact that the wrong carbon tank oil-gas concentration, especially the virtually high carbon tank oil-gas concentration is obtained are solved. Meanwhile, the carbon tank flushing operation is not executed when the engine works under the dynamic working condition, the situation that the engine obtains the wrong carbon tank oil gas concentration under the dynamic working condition is avoided, and the problems of unstable idling and even flameout in the flushing process caused by the wrong carbon tank oil gas concentration are further avoided.

The utility model relates to gas detection technical field, the utility model provides a kind of portable gas calibration device, can realize portable flow adjustable, gas species selectable, configuration accurate, simple operation and safe use. The utility model device can produce five kinds of standard gas in hydrogen in air, hydrogen in oxygen, hydrogen in nitrogen, oxygen in hydrogen and oxygen in nitrogen, when producing hydrogen in air, can not use standard gas cylinder, by extracting field air after pretreatment as carrier gas to carry out gas distribution;When producing other gas, only need to be equipped with a bottle of carrier gas standard gas. The utility model gas distribution principle is simple, concentration is accurate, greatly facilitates the calibration of on-site analyzer, realizes portable flow adjustable, gas species selectable, configuration accurate, simple operation.

This invention discloses a quantitative assessment method for the impact of meteorological conditions on atmospheric particulate matter pollution. Through modeling, historical data on wind speed, humidity, temperature, and mixing layer height can be used to scientifically predict the future trend of pollutant concentrations. This invention's quantitative assessment method for the impact of meteorological conditions on atmospheric particulate matter pollution constructs a quantitative assessment model of the impact of meteorological conditions on particulate matter pollution through the analysis of experimental data. This model can accurately assess the degree of influence of meteorological conditions, providing effective assistance for the control of atmospheric particulate matter pollution.

The invention discloses a trace moisture standard gas preparation device and method, and relates to the technical field of standard gas. The device comprises: a high-purity gas source; the flow control module is connected with the high-purity gas source and used for controlling the flow of the high-purity gas source; the permeation system comprises a sealing cavity, a permeation pipe and a thermostat, distilled water is contained in the sealing cavity and heated through the thermostat, and the permeation pipe is arranged in the sealing cavity; the high-purity gas enters the permeation pipe through the flow control module and the connecting pipeline and is fully mixed with water permeating into the permeation pipe to form trace water standard gas, and the invention further provides a preparation method of the trace water standard gas based on the device. The device realizes the preparation of the trace moisture standard gas, and has the advantages of simple structure, convenience in operation, low cost, short production preparation period, high stability and accurate concentration of the trace moisture standard gas, and can be used for quickly preparing a large amount of the trace moisture standard gas.

This invention discloses a method for detecting hexavalent chromium in cement, belonging to the field of cement quality testing technology. The method includes: preparation of standard solution, preparation of colorimetric reagent, plotting of standard curve, cement sample processing, sample determination, and waste liquid treatment. This invention solves the problems of insufficient detection stability, non-standardized operation procedures, and poor environmental performance of existing technologies. It has the advantages of accurate detection, simple operation, and safety and environmental protection, and can be widely applied to cement production quality control and environmental testing scenarios.

This invention relates to a nuclear-targeted multimodal imaging diagnostic probe with BNCT therapeutic efficacy, its preparation, and its application, belonging to the fields of biomedicine and nuclear medicine technology. This boron drug contains... 10 Using acetylacetone difluoroborate as the parent nucleus, this invention endows the tumor with nuclear targeting ability by introducing N- or S-containing heterocyclic structures, while utilizing its conjugated structure to provide fluorescence / photoacoustic dual-modal imaging functionality. Based on this, the invention achieves three core functions: first, through fluorescence / photoacoustic dual-modal imaging, it enables the visual localization and real-time monitoring of tumor sites; second, by leveraging the binding of nuclear targeting groups to nuclear DNA / RNA, it... 10 B is precisely delivered into the nucleus, significantly improving the killing efficiency of BNCT; thirdly, thermal neutron irradiation is performed under imaging guidance, triggering... 10 The B(n,α)⁷Li nuclear fission reaction ultimately enables high-precision integrated diagnosis and treatment. This invention also discloses a method for preparing this probe, which has promising clinical application prospects.

The application belongs to the technical field of infrared laser radar, and provides a laser radar chip integration method for gas cloud imaging, which comprises the following steps: integrating a mid-infrared band intercascade laser and a mid-infrared detector on a same silicon substrate; when the integrated chip is packaged, a micro-mirror, a MEMS mirror and a transceiver chip are combined and packaged in a same module; the laser rear end transmits light to the micro-mirror, the micro-mirror moves forward and backward through a piezoelectric ceramic, the light emitted by the laser front end hits the MEMS mirror, the light emitted by the MEMS mirror is reflected after hitting the detected gas and is received by the detector; the application realizes the integration of emission, reception and spatial scanning, gives a gas distribution diagram of the whole space through scanning spectrum imaging, can provide accurate gas concentration at any position in the space, and can detect multiple gases simultaneously through spectrum tuning of a wide spectrum light source.

The utility model discloses a liquid medicament accurate adding device, which relates to the technical field of medicament adding equipment and comprises a solution tank, a stirrer is arranged at the top of the solution tank, at least one group of medicament automatic adding mechanism is arranged on the solution tank, each medicament automatic adding mechanism comprises a discharge pump and a metering pump, a liquid inlet end of each discharge pump is connected with a first flowmeter, and a liquid outlet end of each metering pump is connected with a second flowmeter. The first flow meter is connected with a three-way electromagnetic valve; the other two ports of the three-way electromagnetic valve are respectively connected with a medicament stock solution pipe and a medicament solution pipe, and the other end of the medicament solution pipe is connected to the bottom of the solution box; the liquid outlet end of the discharge pump is connected to the top of the solution tank through a dosing pipe; the liquid inlet end of the metering pump is connected to the medicament solution pipe, and the liquid outlet end is connected with the medicament adding pipe; a tap water pipe is arranged at the top of the solution tank. According to the utility model, accurate preparation and automatic dosing of the medicament can be realized, the problem of medicament waste caused by extensive dosing of the medicament can be avoided, and the efficiency of medicament preparation and dosing is effectively improved.

The gas detection method and system based on the multi-channel integrating sphere optical gas chamber of the present invention uses a multi-channel integrating sphere optical gas chamber, wherein the integrating sphere is provided with 5 through holes along the equatorial axis direction, each through hole is equipped with a filter, through holes are respectively provided on both sides of the horizontal axis of the integrating sphere, one through hole is used as a light inlet, the opening direction of the light inlet is perpendicular to the opening direction of the through hole for installing the filter, and the other through hole is provided with a connector, the connector is driven to rotate the integrating sphere, and an air inlet and an air outlet are also provided on the integrating sphere; infrared light enters the optical gas chamber through the light inlet, and the mixed gas to be measured enters the optical gas chamber through the air inlet, the connector is driven to rotate the integrating sphere, and the light passes through different filters, and the optical signal of each channel is converted into an electrical signal through a photoelectric detector to obtain the electrical signal value of each gas. The present invention utilizes the rotation characteristics of the sphere of the integrating sphere and the setting of multiple filters to efficiently and accurately detect multiple gases synchronously.

The invention discloses an NO2 sensor and an air switch cabinet air discharge real-time monitoring method, and the construction of a sensor array of the NO2 sensor specifically comprises the following steps: depositing a heating electrode on a silicon substrate as a heating layer; and a plurality of interdigital electrodes are arranged at the top of the sensor array and are used for measuring the resistance of various materials. An interdigital electrode layer is arranged on the heating layer, specifically, the arrangement mode between electrodes is similar to a finger staggered structure, and the four interdigital electrodes in the interdigital electrode layer are used for measuring the resistance of different materials. Si3N4 layers are arranged between the silicon substrate and the heating layer and between the heating layer and the interdigital electrode layer to serve as insulating layers. The sensor array of the NO2 sensor has good selectivity, and can be used for detecting 250ppb of NO2; the sensor shows a good response recovery characteristic on NO2; and estimation is carried out through the CNN-ALSTM model, the concentration is predicted, and the prediction result is relatively accurate.

The invention relates to the technical field of energy storage and flow batteries, in particular to an electrolyte chromium dichloride concentration testing system and method and application. The system comprises an inert atmosphere device and a testing device, and the testing device is arranged in the inert atmosphere device; a potential monitor and a titration sub-device are arranged in the testing device. According to the method, the ferric chloride solution with a certain concentration is used as the oxidizing agent, the oxidation-reduction potentiometric titration test is carried out in the inert gas atmosphere, the oxidizing agent is not prone to deterioration, economical and easy to obtain and does not react with any other substances / ions except Cr < 2 + > in the electrolyte, the test accuracy is guaranteed, and the test time is shortened. The method for judging the reaction endpoint by potential mutation avoids the interference of ion color judgment, so that the accurate concentration of Cr < 2 + > in the electrolyte of the iron-chromium flow battery can be quickly obtained.

The invention provides blood glucose test paper and a preparation method thereof, and belongs to the technical field of test paper. The preparation method comprises the following steps: dissolving 3, 3 ', 5, 5'-tetramethyl biphenyl diamine in ethanol, adding a catalytic developing factor, carrying out uniform ultrasonic dispersion, spraying onto a PET (Polyethylene Terephthalate) film through spraying equipment, carrying out freeze drying, coating with the PET film, and reserving a blood contact hole and an observation hole, so as to obtain the blood glucose test paper. The preparation method of the prepared blood glucose test paper is simple, easy and convenient to operate and low in cost, catalytic reaction can be efficiently completed through low-concentration catalytic chromogenic factors, the reaction sensitivity is high, the result is accurate, the detection limit is low, and wide application prospects are achieved.

The present invention provides a method for determining ammonia-containing heavy metal wastewater, including: providing standard copper-ammine complex solutions of different concentrations, measuring them respectively using an ultraviolet-visible spectrophotometer to generate a first ultraviolet-visible spectrum; collecting first spectral data of the first ultraviolet-visible spectrum in a band of 500 to 800 nm, and establishing a concentration prediction model based on the spectral data; measuring the copper-ammine complex solution sample to be tested under the same measurement conditions as the standard copper-ammine complex solution to generate a second ultraviolet-visible spectrum; collecting second spectral data of a band of 500 to 800 nm in the second ultraviolet-visible spectrum; standardizing the second spectral data in turn, performing principal component regression analysis, and determining the concentration of the copper-ammine complex solution sample to be tested based on the concentration prediction model. Compared with the prior art, the method for detecting copper-ammine complex ions in water bodies realizes rapid and accurate monitoring of the actual copper-ammine complex ion concentration in each treatment link.

The present application belongs to the field of pollution source tracing technology, and more specifically, it relates to a heavy metal pollution tracing method based on artificial intelligence, which uses a stratified random sampling method to conduct multi-layer depth collection in different landform types, and performs outlier processing and standardization on the collected heavy metal concentration detection data, terrain segmentation and feature extraction on terrain data, and spatial interpolation and time matching on rainfall data; by obtaining historical pollution event records and wind speed and direction data, and constructing the interactive characteristics of rainfall and slope, the data dimension is further enriched. Then, the processed multidimensional feature matrix is ​​input into the trained prediction model to obtain accurate heavy metal concentration and spatial distribution characteristics. Finally, the Bayesian inverse modeling method is used to infer the location of the pollution source, thereby realizing the accurate tracing of the heavy metal pollution source, improving the accuracy and reliability of the tracing results, and effectively solving the technical problem that the tracing results in the traditional method are not scientific and systematic enough.

The invention discloses a chip for high-throughput detection of water-mediated protozoa and / or worms, the chip is an OpenArray chip, primers and probes corresponding to different target species to be detected are respectively fixed in small holes of each subarray of the OpenArray chip, and the target species to be detected are 22 types of water-mediated protozoa and worms. Primers and probes of a to-be-detected target species are designed according to specific genes of 22 kinds of water-medium protozoa and worms. The high-throughput detection chip is adopted to determine the kinds of the water-medium protozoa and worms contained in an environment to-be-detected sample and determine the corresponding concentrations of the water-medium protozoa and worms; by adopting the detection chip disclosed by the invention, 192 samples can be used for simultaneously carrying out high-throughput molecular screening on protozoa and worms of 22 target species, and the detection efficiency is remarkably improved; when the chip is used for detecting the types and the concentrations of the water-medium protozoa and the worms in an environment sample, the detection result is high in accuracy and high in credibility; the chip is high in detection sensitivity on a detection target, good in repeatability and stability, and good in credibility of a detection result.

The invention discloses preparation and application of an electrochemical aptamer sensor for sex hormone estradiol detection, and belongs to the technical field of electrochemical biosensors. According to the sensor, sulfydryl polyethylene glycol and a capture chain are co-assembled on a gold electrode, so that the stability and pollution resistance of the electrode are remarkably enhanced. By means of specific binding and strand displacement reaction between the estradiol aptamer and the signal strand, accurate detection of estradiol without signal amplification is achieved. Electrochemical signals are collected by adopting differential pulse voltammetry, the detection range of the sensor is wide (7.5 pM to 100 nM), the detection limit is low (7.5 pM), the accuracy and reliability of detection are ensured, and good reproducibility is achieved. The preparation method of the sensor is simple, convenient and rapid, has high cost effectiveness, and is easy to realize large-scale production and application. In the fields of medical diagnosis, environmental monitoring, food safety and the like, the electrochemical aptamer sensor is rapid and accurate in detection, short in time consumption, suitable for rapid diagnosis and high-throughput screening and wide in application prospect.

The present invention relates to a kind of ammonia detection test paper, in particular to a kind of polyphenols loaded silicon oxide hydrogel test paper and its preparation method and application, including the following steps: S1: tetraethyl orthosilicate, ethanol, deionized water and hydrofluoric acid are mixed to obtain a precursor solution of silicon oxide hydrogel; S2: polyphenols are added to the precursor solution of silicon oxide hydrogel, stirred and ultrasonically dispersed to completely dissolve, and then hydrofluoric acid is added dropwise thereto to adjust the viscosity of the mixed solution; S3: the test paper template is completely inserted into the mixed solution, and then the test paper template is pulled for coating to obtain a test paper with silicon oxide polyphenols hydrogel; S4: the test paper with silicon oxide polyphenols hydrogel is aged and dried to obtain a polyphenols loaded silicon oxide hydrogel test paper. Compared with the prior art, the preparation method of the present invention is simple, raw materials are easy to obtain, cost is low, the prepared test paper is easy to carry, concentration detection is fast and accurate, and it is suitable for practical use.

The utility model relates to the technical field of ammonia water dilution, in particular to efficient ammonia water dilution equipment and a control system thereof, the equipment comprises a primary mixing chamber, the top end of the primary mixing chamber is provided with a purified water inlet and a liquid ammonia inlet, and the side wall of the primary mixing chamber is provided with a discharge hole for ammonia water to pass through; the secondary mixing chamber completely wraps the discharge hole in the side wall of the primary mixing chamber; the first heat exchange device is arranged to completely cover the outer side wall of the secondary mixing chamber; and the second heat exchange device is arranged at a liquid outlet of the secondary mixing chamber. The ammonia water dilution device solves the problems that safety accidents are easily caused by human errors due to the fact that existing ammonia water dilution equipment cannot be automatically controlled, the absorption effect is poor and the concentration is not uniform due to the fact that the existing ammonia water dilution equipment only adopts one-time dilution and mixing, and in addition, the dilution amount range is narrow, and the cost is low. And one set of equipment cannot cover the amount of ammonia water required by low, medium and high dilution.

The invention relates to the field of biological detection, and particularly discloses a lateral chromatography paper-based sensor for detecting a heart failure biomarker NT-proBNP. The lateral chromatography paper is composed of a bottom plate, and a sample pad, a combination pad, a detection pad and a water absorption pad which are sequentially overlapped and pasted on the bottom plate along a sample chromatography direction, the combination pad is coated with a gold nanoparticle coupling aptamer 1, and the aptamer 1 is an aptamer capable of being specifically combined with NT-proBNP; different positions of the detection pad are coated with NT-proBNP specific antibodies and aptamers 2, so that a detection line and a quality control line are respectively formed. The lateral chromatography paper can realize qualitative detection of heart failure biomarkers NT-proBNP in samples such as serum, plasma and urine by naked eyes, can realize quantitative detection of NT-proBNP based on application of intelligent equipment, is a simple, rapid and sensitive detection mode, and has a wide application prospect.

The application relates to a preparation method of a HOF ratio fluorescent sensor and application of the HOF ratio fluorescent sensor in ammonia gas detection in exhaled air of patients with liver and kidney diseases. The material can detect trace ammonia gas, the lower limit of ammonia gas detection is 0.7 ppm, two opposite fluorescent response signals can accurately quantitatively detect the concentration of ammonia gas in the exhaled air of patients with liver and kidney diseases, the ammonia gas concentration obtained through testing keeps a high positive correlation with the blood ammonia concentration, specifically, the exhaled air of patients with liver and kidney diseases is collected in an aluminum foil gas collecting bag, the collected gas is introduced into an aqueous solution containing a ratio fluorescent sensing material Pt2Cu4@HOF-101, and the aqueous solution is statically placed for a period of time to complete ammonia gas detection in the exhaled air of the patient and fluorescent color development, or the patient directly blows the gas into the aqueous solution of the fluorescent sensing material to complete ammonia gas detection. Non-invasive rapid detection of liver and kidney diseases can be effectively realized, and the HOF ratio fluorescent sensor is expected to replace traditional blood ammonia detection and be applied to the fields of clinical diagnosis and disease course monitoring of liver and kidney diseases.

The present disclosure relates to a method, device and storage medium for determining the carbon monoxide concentration in a fully mechanized mining face, and belongs to the field of coal mining. The method includes: determining the amount of carbon monoxide generated by the coal left in the goaf; determining the amount of carbon monoxide generated by the coal body after the frame is broken; and determining the carbon monoxide concentration corresponding to the target area according to the amount of carbon monoxide generated by the coal left in the goaf, the amount of carbon monoxide generated by the coal body after the frame is broken, and the over-air volume in the target area. By determining the carbon monoxide concentration by the amount of carbon monoxide generated by the coal left in the goaf, the amount of carbon monoxide generated by the coal body after the frame is broken, and the over-air volume in the target area, the carbon monoxide concentration in the target area can be more accurately determined, thereby avoiding the danger caused by inaccurate false reports of carbon monoxide concentration.

The present invention relates to the field of exhaust gas detection technology, and specifically to a motor vehicle exhaust gas telemetry system and a control method and a control device thereof. A control method for a motor vehicle exhaust gas telemetry system includes: obtaining a first measurement curve of a target gas passing through a first optical path; obtaining the target gas concentration in a standard gas pool; calibrating the standard curve according to a second optical path; and calculating the concentration of the target gas in the motor vehicle exhaust gas according to the calibrated standard curve, the target gas concentration in the standard gas pool, and the first measurement curve. The standard curve is calibrated in real time according to the second optical path, and the concentration of the target gas in the motor vehicle exhaust gas is calculated according to the calibrated standard curve, the target gas concentration in the standard gas pool, and the first measurement curve, so that the calculation of the concentration of the target gas in the motor vehicle exhaust gas is based on the calibrated standard curve, which has high timeliness, and also makes the calculation of the concentration of the target gas in the motor vehicle exhaust gas more accurate, thereby preventing misjudgment of violations of motor vehicle exhaust gas emissions.

The utility model discloses a demister for a sand discharge adjusting barrel in a mine filling work area. The demister comprises a U-shaped clamp, a lifting track, an electric telescopic rod, a lifting seat, a transverse support, an exhaust pipe, an ascending pipe, a condensate discharge pipe, a condenser, a connecting hose and an exhaust fan. The U-shaped clamp installation structure is adopted, other components are all installed on the U-shaped clamp, the U-shaped clamp can be installed and detached only by being integrally taken up or put down, and convenience is achieved. Water mist generated in the adjusting barrel is pumped out through the exhaust pipe, demisting is achieved, it is ensured that the camera observes the condition in the adjusting barrel, the sand discharging condition in the adjusting barrel can be mastered in real time, the tailing utilization rate and the tailing filling amount are increased, and smooth filling work is ensured. The pumped water mist can be further recycled and sent back to the adjusting barrel, water is saved, it is guaranteed that the concentration of slurry in the adjusting barrel is accurate, and filling operation can be controlled easily; the liquid level adjusting device has the function of adjusting the height of the exhaust pipe, adapts to different liquid levels, does not affect normal work of the adjusting barrel and is very convenient to operate.

A CAN bus urea quality sensor concentration correction system and method are disclosed. The CAN bus urea quality sensor concentration correction system includes a urea quality sensor body and a quality concentration probe disposed at the lower end of the urea quality sensor body. The quality concentration probe has a emitting surface and a reflective surface spaced apart from the emitting surface. The CAN signal interface of the urea quality sensor body is electrically connected to a USB-CAN analyzer via a CAN bus. The serial port of the USB-CAN analyzer is electrically connected to the serial port of a host computer. This invention corrects the distance between the emitting and reflective plates of the urea quality sensor through closed-loop compensation data fitting, making the urea concentration measured in a standard urea solution at room temperature more accurate. By integrating concentration measurement data under other temperature and concentration conditions through a large amount of experimental data, the measurement accuracy of the ultrasonic probe product is significantly improved. No additional components are required, and the correction speed is fast, exhibiting high correction accuracy and practicality.

The invention relates to the technical field of precious metal nano catalytic materials, in particular to a three-dimensional porous graphene composite catalyst layer membrane electrode system and a preparation method thereof.The three-dimensional porous graphene composite catalyst layer membrane electrode system comprises a layer membrane electrode preparation system, and the layer membrane electrode preparation system comprises a platinum-carbon catalyst preparation stage; the platinum-carbon catalyst preparation stage is further provided with a layer membrane electrode slurry preparation stage in a matched mode, the layer membrane electrode slurry preparation stage is further provided with a cathode catalyst layer preparation stage and an anode catalyst layer preparation stage in a matched mode, and the layer membrane electrode preparation method further comprises a membrane electrode treatment stage. The high dispersity and uniformity of the catalyst are realized, the catalytic performance and the stability of the electrode are improved, the electrode structure is optimized, the porosity and the ion conduction performance are improved, and the efficiency and the service life of the battery are remarkably improved.

The present invention relates to the technical field of automobile exhaust treatment, and discloses a nitrogen oxygen sensor oxygen pumping device, a nitrogen oxygen sensor and an oxygen pumping method thereof. The nitrogen oxygen sensor oxygen pumping device comprises a signal processing module and an oxygen pumping module. The signal processing module is used to detect and process a pump current signal of a pump electrode and a reference induced potential signal of a reference electrode to obtain an advance oxygen pumping signal, and send the advance oxygen pumping signal to the oxygen pumping module; wherein the reference induced potential signal is generated by superimposing the potential difference generated by the oxygen concentration difference between the main pump electrode and the reference electrode on the reference electrode, and the potential of the main pump electrode is a preset value; the oxygen pumping module is used to connect the signal processing module, and is used to adjust the main pump-pump potential difference between the main pump electrode and a pump electrode according to the received advance oxygen pumping signal, so as to pump oxygen to a chamber. The nitrogen oxygen sensor oxygen pumping device provided by the present invention solves the problem of inaccurate concentration measurement of nitrogen oxides in nitrogen oxygen sensors in the prior art.