30results about How to "Determine the concentration" patented technology

A method of optimizing system parameters in a crude unit to reduce corrosion and corrosion byproduct deposition in the crude unit is disclosed and claimed. The method includes measuring or predicting properties associated with the system parameters and using an automated controller to analyze the properties to cause adjustments in the chemical program to optimize the system parameters. Adjusting the system parameters effectively controls corrosion in the crude unit by reducing the corrosiveness of a fluid in the process stream and / or by protecting the system from a potentially corrosive substance. System parameter sensing probes are arranged at one or more locations in the process stream to allow accurate monitoring of the system parameters in the crude unit.

The invention discloses a high flux detection method and detection biochip based on nucleic acid address coding. According to the invention, the principle of specific complementation and hybridization of nucleic acid is ingeniously utilized to locate nucleic acid with different sequences at different areas of the chip; conjugates of complementary nucleic acid and proteins are located at corresponding positions on the biochip because of interaction among nucleic acid; therefore, disadvantages and deficiency of conventional protein chips are overcome, a whole reaction is carried out in a liquid environment, and since genetic coding is infinite, limitation of bead coding in liquid phase chips is overcome. Thus, the detection biochip provided in the invention combines the advantages of solid phase chips and liquid phase chips and enables a more accurate high flux detection reaction to be achieved.

Embodiments provide a handheld fluorometer and method of determining a concentration of a product within a sample. In some cases the handheld fluorometer includes an immersible sensor head that measures a fluorescence of the product and a controller that calculates the concentration of product. In some cases the handheld fluorometer includes a handheld controller module, an immersible sensor head connected to the controller module, a sample cup for containing a water sample, and a fastener that removably fastens the sample cup about the immersible sensor head. In some cases the sensor head is angled with respect to the controller module and the fluorometer provides a substantially stable base. The sample cup can be removed to acquire a sample of water containing the product and then refastened about the sensor head for determining the concentration.

A method for reconstructing a fluorescence image of the interior of a turbid medium is provided. The method comprises the step: accommodating a turbid medium (1) to which a fluorescent contrast agent has been administered in a measurement volume (4). The fluorescent contrast agent is capable of emitting light in a first range of wavelengths upon irradiation with light. The method further comprises: performing attenuation measurements at a plurality of different wavelengths ([lambda]i, . . . [lambda]k) by subsequently irradiating the turbid medium (1) with light from a plurality of different source positions and detecting light emanating from the turbid medium (1) in a plurality of detection positions for each source position; reconstructing absorption properties ([mu]a(r, [lambda])) as a function of the position in the interior of the turbid medium (1) for the plurality of different wavelengths from the attenuation measurements; calculating absorption properties as a function of the position in the interior of the turbid medium (1) for wavelengths of the first range of wavelengths; performing a fluorescence measurement by subsequently irradiating the turbid medium (1) with light causing the fluorescent contrast agent to emit light in the first range of wavelengths from the plurality of source positions and detecting the light emanating from the fluorescent contrast agent in the plurality of detection positions for each source position; and reconstructing a fluorescence image of the spatial distribution of the fluorescent contrast agent in the interior of the turbid medium (1) from the fluorescence measurement using the calculated absorption properties.

The invention provides a photochemical chemical oxygen demand (COD) electrode and a method of measuring the same. The working electrode is a nanometer titanium dioxide photocatalysis and photooxidation electrode and is arranged in a supported electrolyte solution cavity. After organic matters in the water sample under test enter the supported electrolyte solution cavity and reach the surface of the working electrode by a polytetrafluoroethylene filter element through diffusion, the working electrode generates photo-generated electrons and holes under the ultraviolet irradiation; the holes arecaptured by the organic matters and then catalyzed and oxidized by the organic matters; the photo-generated electrons are forced to flow to a counter electrode and a platinum electrode under the action of an external electric field; and the platinum electrode is captured by oxidant in an electrolyte solution cavity of the counter electrode to form the light current. The amperage of the light current depends on the speed the organic matters enter the supported electrolyte solution cavity through diffusion and is proportional to the concentration of the oxidizable organic matters in the water sample under test, i.e., the COD in the water sample under test. The outer surface of the polytetrafluoroethylene filter element is provided with an automatic cleaning brush which can clean the surfaceof the polytetrafluoroethylene filter element at regular time to prevent the polytetrafluoroethylene filter element from being blocked. The invention is very practical and is suitable for both outdoorconvenient measuring and long-time real-time monitoring.

The invention relates to a method for determining residual Sulfamethoxazole and Danofloxacin in milk simultaneously by a fluorescence spectrum. The method includes scanning deproteinized and derivatized milk according to a three-dimension excitation emission matrix fluorescence spectrum, analyzing the fluorescence spectrum by means of chemical metering, and establishing a multi-variate correction model capable of detecting content of Sulfamethoxazole and Danofloxacin in milk simultaneously quickly. By the fluorescence method, negative samples and positive samples can be identified quickly when in prediction of the residual Sulfamethoxazole and Danofloxacin in unknown milk samples by the established correction model, and further, content of two drug residues can be determined. The fluorescence method has the advantages of simplicity, rapidness and high flexibility, detection efficiency is increased greatly, operation processes for detecting antibiotic residues are simplified, samples in batch can be processed, and the fluorescence method can be popularized in detection application.

The invention provides a photovoltaic power prediction method based on a haze / dust coverage range. The method comprises the following steps: acquiring meteorological forecast element data at the current / near moment, performing gridding processing and performing correction; substituting the corrected gridding weather forecast element data into a pre-constructed prediction model to obtain the haze / sand dust concentration and the coverage range of each grid; and substituting the haze / sand dust concentration and the coverage range of each grid into a predetermined correlation between haze / sand dust and photovoltaic power to obtain a photovoltaic power prediction value in the affected grid. According to the technical scheme provided by the invention, correlation analysis is carried out on meteorological forecasting elements and haze / sand dust concentration values by utilizing a statistical method, and a forecasting model is established, so that more accurate photovoltaic power forecasting of an area where the photovoltaic power station is located is achieved.

The application provides a method and device for analyzing surgical smoke, and a storage medium, and the method comprises the following steps of receiving a surgical tissue image captured by a cameraduring a surgery, wherein the surgical tissue image includes the surgical smoke generated by a surgical instrument acting on the surgical tissue; analyzing the surgical tissue image to determine the type, concentration and dispersion speed of the surgical smoke; and processing the type, concentration and dispersion speed through a preset classifier to determine whether the startup of a smoke purification system needs to be controlled. The type, concentration and dispersion speed of the surgical smoke can be obtained by analyzing the surgical tissue image, and the type, concentration and dispersion speed of the surgical smoke is analyzed by the classifier to determine whether the smoke generated at this time requires clearing by the smoke purification system, so as to control the timing ofthe smoke purification system to avoid the startup of the smoke purification system that requires no startup, thereby avoiding the waste of energy.

The invention relates to a water softening device comprising: a softening unit, in particular comprising at least one container with ion exchange resin; a storage vessel used for storing a regenerantsolution and further comprising a solid regenerant salt; an ejector used for transporting the regenerant solution from the storage vessel to the softening unit; an electronic control device for controlling the delivery of the regenerant solution from the storage vessel into the softening unit. The water softening device is designed to: predetermine or measure the volume V1 or the mass M1 of the delivered regenerant solution in a delivery step; predetermine or measure a duration t1 for conveying the volume V1 or the mass M1; and the electronic control device is used for determining the concentration CRM1 of the delivered regenerant solution and / or a parameter dependent on the concentration of the delivered regenerant solution from V1 or M1 and / or t1 by means of a stored calibration function. The invention also relates to a method for operating the water softening device.

The invention discloses a calibration method for a flow calibration coefficient of multi-component mixed gas. The method comprises the following steps: (1) taking a mass spectrum as a gas flow detector, and selecting a gas which does not react with any component in the mixed gas as a reference gas; (2) injecting a single reference gas by using a standard flow controller, injecting a mixed gas through a to-be-detected flow controller or a flow meter, mixing the injected reference gas and the mixed gas, and detecting the mixture by using a mass spectrum; (3) according to the mass spectrum characteristic chromatograms and the relative sensitivity of the different components in the mixed gas, obtaining the actual flow of the different components through a mass spectrum quantitative analysis technology, wherein the mass spectrum quantitative analysis technology is an equivalent characteristic spectrum method; (4) summing and calculating the actual flow of the mixed gas; and (5) comparing the actual flow with the numerical value of the flow controller or the flow meter to be detected to obtain a calibration coefficient of the flow controller or the flow meter to be detected.

The invention provides an air sampling device for environment detection, which comprises a first box body, the top of the first box body is provided with a lifting mechanism, the bottom of the inner cavity of a second box body is fixedly connected with a motor, the output end of the motor is fixedly connected with a first bevel gear, and the outer side of the first bevel gear is engaged with a second bevel gear. The inner ring of the second bevel gear is fixedly connected with a threaded rod, the outer side of the threaded rod is in threaded connection with a threaded block, and one side of the threaded block is fixedly connected with a fixing rod. A motor is arranged to drive a first bevel gear to rotate, the first bevel gear is in engaged connection with a second bevel gear to drive a threaded rod to rotate, the threaded rod rotates to enable a threaded block to move up and down, and the threaded block is fixedly connected with a fixed rod to drive a sampling mechanism to ascend and descend; the air sampling device solves the problems that an existing air sampling device cannot sample air at different heights, so that the sampled air cannot meet the requirements, and errors can be generated in the detection result.

Belonging to the technical field of calcium ion detection, the invention discloses an aggregation induced luminescent probe, preparation and application thereof in calcium ion detection and imaging. The aggregation induced luminescent probe has a structure shown as formula I, wherein R is hydrogen, alkyl, perfluoroalkyl, alkoxy, alkylthiol, alkyl amino, halogen, cyano, nitro, or heteroaryl; X is axial bond or alkylidene; Y is axial bond, arylidene, or heteroarylidene; A<+> is a cation. The aggregation induced luminescent probe is used for calcium ion detection and imaging. The probe for calcium ion detection has the characteristics of wide response range, strong fluorescence, high lightening ratio up to 10 times or more, and high signal-to-noise ratio, effectively overcomes the defect of aggregation quenching luminescence in traditional fluorescent materials. At the same time, the probe has the advantages of simple preparation, low cost and convenient operation, is suitable for specific imaging and detection in high concentration aggregation areas of calcium ions, and has good detection effect.

A method for determining the concentration of a liquid is disclosed. The invention relates to a method for determining the concentration of a liquid (3), in which an ultrasonic transducer (72) and at least two ultrasonic reflecting surfaces (731, 732) are arranged on a carrier element (73) which is formed in a common one-piece manner, said at least two ultrasonic reflecting surfaces being at different distances from the ultrasonic transducer (72). The concentration is determined in a measurement operation from a first propagation time of the ultrasonic signal between the ultrasonic transducer (72) and the first ultrasonic reflecting surface (731) without having to reflect the ultrasonic signal at another ultrasonic reflecting surface (732). In a calibration operation, a first propagation time and a second propagation time (93, 94) of the ultrasound signal between the first ultrasound reflecting surface (731) and the at least one other ultrasound reflecting surface (732) are determined.

The invention provides an iodometry-based method for measuring concentration of peroxide in a peroxo-monosulfate, peroxo-disulfate and hydrogen peroxide mixed solution, and relates to the iodometry-based method for measuring concentration of each peroxide in the peroxo-monosulfate, peroxo-disulfate and hydrogen peroxide mixed solution. The invention aims to solve the problem that respective concentration of three oxidizing agents in three oxidizing agent mixtures cannot be measured by an existing method. The iodometry-based method comprises the steps of adding a to-be-detected liquid into sodium bicarbonate and potassium iodide, adding acetic acid after standing, performing titration, and calculating to obtain concentration sum of the oxidizing agents; taking and adding the to-be-detectedliquid into disodium hydrogen-sodium dihydrogen phosphate buffer liquid and a catalase solution, adding the sodium bicarbonate and the potassium iodide, adding acetic acid after standing, and performing titration to obtain concentration sum of PMS and PDS; and taking the to-be-detected liquid, adding disodium hydrogen-sodium dihydrogen phosphate buffer liquid and the catalase solution, adding potassium iodide and an acetic acid-sodium acetate buffer liquid, performing titration after standing, and calculating to obtain concentration of the PMS. The iodometry-based method is applied to the field of oxidizing agent concentration measurement.

The invention discloses a multifunctional graphene quantum dot detection agent and application thereof. P-phenylenediamine is dissolved in alcohol and heated to obtain a graphene quantum dot solution, then the graphene quantum dot solution is dripped on test paper, graphene quantum dots are dispersed into the test paper, detection test paper is obtained after a solvent is volatilized, and the detection test paper is red under the excitation of ultraviolet light. P-phenylenediamine is used as a raw material, so that the graphene quantum dots finally emit stronger red fluorescence under the excitation of ultraviolet light, the color of the detection test paper is brighter red, the red fluorescence is quenched by formaldehyde in a formaldehyde environment, so that the color of the detection test paper is darkened. As the red color of the detection test paper is very strong at the beginning, low-concentration formaldehyde also enables the detection test paper to fade more obviously. Therefore, the detection lower limit of the detection test paper is effectively improved.

The invention discloses a magnetic fullerene nano-material and application thereof in magnetic dispersion solid-phase extraction of methyl methoxyacrylate pesticides. The preparation method comprisesthe following steps: firstly, modifying Fe3O4 nanoparticles by using tetraethoxysilane (TEOS) to obtain ferroferric oxide superparamagnetic particles wrapped by silicon dioxide, wherein the silicon dioxide-coated ferroferric oxide superparamagnetic particles are marked as Fe3O4@SiO2 nanoparticles; then, enabling the Fe3O4@SiO2 nanoparticles to react with 3-chloropropyltrimethoxysilane so as to obtain Fe3O4@SiO2@Cl nanoparticles; finally, enabling fullerene C60 to react with benzaldehyde and benzylamine to obtain 2,5-diphenylfullerenepyrroline, and then enabling the 2,5-diphenylfullerenepyrroline to react with the Fe3O4@SiO2@Cl nanoparticles to obtain the magnetic fullerene nano-material which is recorded as Fe3O4@SiO2@C60 nanoparticles. The magnetic fullerene nano-material disclosed by theinvention can be used for magnetic dispersion solid-phase extraction of methyl methoxyacrylate pesticides, and is strong in adsorbability, large in adsorption capacity, good in selectivity and easy to elute.

The invention relates to a method for processing exhaust gas of an internal combustion engine (10) with at least one combustion chamber (12). The air inlet (22) of the internal combustion engine is connected to a gas feeding system (20); and the air outlet of the internal combustion engine is connected with an exhaust device (40) of the internal combustion engine. Each combustion chamber is provided with at least one ignition device, which is used to ignite a stoichiometric combustion air mixture in the combustion chamber. The exhaust device is provided with an exhaust channel (46), and at least one exhaust gas post-treatment member is arranged in the exhaust channel. The exhaust device is connected to the gas feeding system of the internal combustion engine through an exhaust gas recirculation system (60), and an exhaust gas recirculation cooler (70) is arranged in the exhaust gas recirculation system. The method comprises the following steps: burning the stoichiometric combustion airmixture (lambda=1) to operate the internal combustion engine; purifying the exhaust gas of the internal combustion engine by an exhaust gas post-treatment component; determining the operation point of the internal combustion engine; and adjusting the exhaust gas recirculation rate at a constant load point of the internal combustion engine so as to change the temperature of the exhaust gas.

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.