30results about How to "Concentration determination" patented technology

Background composition concentration data representative of an actual background composition of a sample gas can be used to model absorption spectroscopy measurement data obtained for a gas sample and to correct an analysis of the absorption spectroscopy data (e.g. for structural interference and collisional broadening) based on the modeling.

The invention provides a method and a device for remotely measuring methane concentration by methane gas mass interface recognition and laser with an adjustable measuring range and relates to the field of gas detection and analysis. The device is composed of an STM32 controller, a laser device driving circuit, a laser device temperature control circuit, a photoelectric detection circuit, a lock phase demodulating circuit, a three-dimensional space laser measuring tracking device and an internally-arranged air velocity transducer, wherein the STM32 controller is in circuit connection with the laser device driving circuit, the laser device temperature control circuit, the lock phase demodulating circuit and the three-dimensional space laser measuring tracking device respectively; and the photoelectric detection circuit is connected with the lock phase demodulating circuit. The method is high in measurement speed which reaches ms-grade responding time, and has high measurement sensitivity which reaches ppm magnitude order; the maximum detection distance is 100 meters and the detection can be finished in one step in a range of 30 meters long, so that the detection efficiency is improved; the requirements on the environment are not high and influences on a measurement result are not caused in a detected gas atmosphere containing high dust and having strong corrosiveness; and by adopting a remote detection function, the detection of places which cannot be reached or are difficult to reach can be realized.

The invention discloses a method for measuring the concentration of coal powder. The method comprises the following steps of: 1) selecting an air flow parameter measurement point I and an air flow parameter measurement point II before and after powder conveying air flow and the coal powder are mixed on a primary air pipeline, setting the unmixed air flow parameter measurement point I at a position where the air flow is steady, and the coal powder and the air are going to be mixed, setting the mixed air flow parameter measurement point II at a position where the speed of coal powder particles reaches the speed of the air flow behind the mixed point, selecting a pipe section L as a flow pressure drop measurement pipe section from a horizontal straight pipeline after the speed of the coal powder particles reaches the speed of the air flow, and arranging static pressure measurement points for measuring the pressure drop of the straight pipe section at two ends of the pipe section L respectively; 2) measuring the static pressure P1 and the full pressure P before mixing; 3) measuring the static pressure P2 after mixing and the pressure drop deltaPLD of the pipe section L; and 4) calculating the concentration of the coal powder. The invention also discloses a measurement device for implementing the method. The method and the device for measuring the concentration of the coal powder are suitable for primary air pipelines of a middle warehouse-type powdering system boiler.

The invention discloses a method and a device for measurement of concentration and flow of pulverized coal, which includes steps: firstly, selecting flow parameter measuring point I before mixing of pulverized coal conveying air flow with pulverized coal and flow parameter measuring point II after mixing on a primary air pipeline, wherein the flow parameter measuring point I before mixing is arranged at a flow stable position before mixing of the pulverized coal with air, and the flow parameter measuring point II after mixing is arranged at a position where the pulverized coal speed reaches the flow speed after mixing; determining flow pressure drop measurement pipe section L on a horizontal straight pipeline; and arranging static pressure measuring points for measuring pressure drop of the pipe section at two ends of the pipe section L; secondly, measuring static pressure P1, temperature T1 and full pressure P before mixing; thirdly, measuring static pressure P2 and pressure drop delta PLD; fourthly, calculating flow density 1 before mixing; fifthly, calculating flow speed V1 before mixing, sixthly, calculating pulverized coal concentration mu; and seventhly, calculating pulverized coal flow MP.

The invention discloses an electrochemical ammonia gas sensor chip which is integrally in a sheet shape and comprises a first solid electrolyte layer, a second solid electrolyte layer, a third solid electrolyte layer, a fourth solid electrolyte layer and a fifth solid electrolyte layer. The first solid electrolyte layer is provided with an opening I and a diffusion barrier I; a gas chamber I, a gas chamber II, a gas chamber III, an auxiliary electrode I, an auxiliary electrode II, a measuring electrode, a diffusion barrier II and a diffusion barrier III are arranged on the second solid electrolyte layer, and a reference gas channel and a reference electrode are arranged on the side face of the fourth solid electrolyte layer. Ammonia gas in the gas is oxidized into nitric oxide, converted into electric potential and applied to the measuring electrode, and the concentration of the ammonia gas is determined by detecting the pump current between the auxiliary electrode II and the measuring electrode. The problems that a common ammonia gas sensor chip is short in service life and cannot be used under the high-temperature condition are solved, and the ammonia gas sensor chip is high in sensitivity, high in response speed and high in reliability.

The invention provides a universal method for detecting the total concentration of a monoclonal antibody drug targeting soluble protein in monkey serum. The method comprises the following steps: adding a universal coated antibody working solution into an elisa plate, sealing the plate, and incubating overnight; adding the confining liquid into an elisa plate, sealing the plate, incubating, washing the plate with washing liquid, adding the diluted correction standard sample, blank monkey mixed serum, a quality control product and a monkey serum sample to be detected into the elisa plate, sealing the plate, and incubating; washing the plate with washing liquor, adding the universal enzyme-labeled detection antibody working solution into the enzyme-labeled plate, sealing the plate, and incubating; washing the plate with washing liquor, adding a substrate of enzyme into the elisa plate, and incubating the elisa plate at room temperature for color development; and adding sulfuric acid into the elisa plate to stop color development, reading the absorbance value of each hole of the elisa plate by using an elisa reader, and calculating the concentration value. The detection method provided by the invention can accurately and reliably determine the total drug concentration of the monoclonal antibody of the targeted soluble protein in monkey serum and reflect the actual blood drug concentration.

The invention discloses a Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification processes and a preparation method thereof. The composite catalyst is prepared from an Al2O3-TiO2 composite carrier and an active component CeO2 supported by the carrier. The preparation method comprises 1) preparing an Al2O3-TiO2 composite carrier, and 2) preparing the composite catalyst CeO2/Al2O3-TiO2. The preparation method of the catalyst is simple and has industrial large-scale production feasibility. In a common industrial catalytic temperature section at 200 to 400 DEG C, good simultaneous removal of two ingredients is realized and the amount of the by-product NH3 is low. The Ce-based composite catalyst has a high economic value and promotion value. In the later period, a high conversion rate of the nitrogen oxides and sulfides is realized through the modified catalyst and reaction conditions.

The invention discloses a system for detecting the concentration of a solution based on an SPR sensor. The system comprises the SPR sensor, a broadband light source, a sample cell, a fiber optic spectrometer and a computer, the SPR sensor is arranged in the sample cell, the input end of the SPR sensor is provided with an input optical fiber, the output end of the SPR sensor is provided with an output optical fiber, the input optical fiber is connected with the broadband light source, the output optical fiber is connected with the fiber optic spectrometer, and the fiber optic spectrometer is connected with the computer through a data line, wherein the SPR sensor includes a detection optical fiber and an asymmetric metal film arranged on the detection optical fiber, the detection optical fiber includes a single-mode optical fiber and multimode fibers bilaterally symmetrically arranged at two ends of the single-mode optical fiber, and the two multimode optical fibers are connected with the single-mode optical fiber through welding.

The invention relates to a method for operating a washing machine (1), comprising a container (2), a drum (3) for accommodating laundry items (4), a drive motor (5) for the drum (3), an electrochemical sensor (9) in the container (2) for measuring an electrochemical signal in dependence on a composition of an aqueous liquid (7) in the container (2), and a control device (8), wherein the following steps are performed: (a) providing a detergent-containing aqueous liquid (7) in the container (2); (b) rotating the drum (3) in accordance with a predetermined motion program; (c) ending rotational motion of the drum (3) and allowing the detergent-containing aqueous liquid (7) to rest until a specified calmed state of the detergent-containing aqueous liquid (7) is achieved; and (d) measuring the concentration cten of a detergent in the detergent-containing aqueous liquid (7) provided in step (a) by recording and evaluating electrochemical signals of the electrochemical sensor (9) by using a relationship between electrochemical signals and detergent concentrations, which relationship is stored in the control device (8). The invention further relates to a washing machine (1) suitable for performing the method.

The invention mainly belongs to the field of electrolysis of metal titanium through molten salt, and particularly relates to a method for measuring the concentration of low-valent titanium ions. The method is used for measuring the concentrations of titanium ions in various valence states in a mixed electrolyte through a molten salt electrolysis process, and the valence state of the titanium ions in the mixed electrolyte is Ti<n+>(n=2, 3, 4). The method comprises the following steps: (1) measuring the concentration W1 of Ti<2+> in the mixed electrolyte through a hydrogen measurement method; (2) measuring the concentration W2 in the mixed electrolyte through ammonium ferric sulfate titrimetry based on a solution subjected to hydrogen measurement, wherein the concentration of Ti<3+> is equal to a value obtained by subtracting W1 from W2; and (3) measuring the concentration of Ti<4+> through spectrophotometry. The method can be used for measuring the concentrations of the low-valent titanium ions in various valence states through the molten salt electrolysis process, so as to obtain a relatively stable electrolyte system and guide metal electrolysis preparation or metal titanium electrolysis and refining industrial production.

A capillary electrophoresis apparatus for water sample heavy metal in-situ monitoring comprises a first mini peristaltic pump, a second mini peristaltic pump, a third mini peristaltic pump, a fourth mini peristaltic pump, a first one-way valve, a second one-way valve, a metal tube, a high-voltage-end electrophoresis buffering liquid storage bottle, a waste liquid bottle, a two-way normally-on electromagnetic valve, a crossed four-way buffering liquid storage chamber, a mixing reaction coiler, a capillary tube, a photometric detector and a three-way joint, an electrophoresis high-voltage interface is externally connected with a mini high-voltage power source to serve as an electrode of the electrophoresis separation process, the metal tube serves as another electrode of the electrophoresisseparation process, and the two electrodes form an anode-cathode relationship and form a complete electrophoresis loop, and type of heavy metal and concentration thereof in a solution are determined by analyzing the metal complex solution in the electrophoresis loop through the photometric detector. A detection value of the capillary electrophoresis apparatus is small in deviation relative to a standard value, and the capillary electrophoresis apparatus is high in accuracy, reliability and stability of detection data and has the advantages of low cost, portability, flexibility, easiness in useand high sensitivity.

The invention discloses a method for detecting keratin by using a ThioGlo1 fluorescent probe, which is characterized by comprising the following steps of: mixing the ThioGlo1 fluorescent probe and keratin in a liquid environment for reaction, then detecting the fluorescence intensity when the emission wavelength lambda em is about 510nm and the excitation wavelength lambda ex is 340nm, and judging whether the keratin exists or the concentration of the keratin exists. The ThioGlo1 fluorescent probe is very sensitive to detection of the waste wool keratin and the waste chicken feather keratin, and the fluorescence intensity is in direct proportion to the concentration of the waste keratin, so that the existence of the waste keratin can be indicated or the concentration of the waste keratin can be quantitatively determined. The method can also be used for rapidly screening keratin degrading bacteria, and lays a foundation for high-throughput screening of the bacteria.

The invention relates to a device for detecting human immunodeficiency virus based on neural network. The device comprises a near-infrared spectrophotometer and a computer, the computer is used for receiving absorption spectrogram data obtained by the near-infrared spectrophotometer, and the computer comprises a module for removing background absorption based on a blank serum absorption spectrogram, a module for performing first-order differential processing on spectral data after background absorption removal, a module for dividing a first-order differential processing result into a plurality of sections and performing partial least squares algorithm fitting on each section, a module for determining an absorption peak value for all absorption spectrogram data with the AIDS viruses and a module for calculating the toxicity concentration of the absorption spectrogram data of the AIDS virus based on the absorption peak value. The detection device and a detection method provided by the invention can determine the concentration of the AIDS virus in a very simple and easy-to-operate manner, also have very high sensitivity, and provide a new route for realizing AIDS prevention and control.

The invention provides glycopolypeptide gold nanoparticles and a preparation method and application thereof. The preparation method of the glycopolypeptide gold nanoparticles comprises the following steps: adding glycopolypeptide into a NaOH aqueous solution with the pH value of 12, uniformly stirring to obtain a mixed solution A, heating the mixed solution A to 70-90 DEG C under a water bath condition, dropwise adding a chloroauric acid aqueous solution under a stirring condition to obtain a mixed solution B, and gradually changing the mixed solution B from original faint yellow to wine red after 30-50 minutes to obtain the glycopolypeptide gold nanoparticles. The carboxyl functionalized gold nanoparticles are obtained through one-step reduction of glycopolypeptide, the process of preparing the gold nanoparticles can be greatly simplified, meanwhile, detection of various metal ions is achieved through the gold nanoparticles, the detection speed is high, and the detection method is simple and convenient.