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5555results about "Material analysis by observing effect on chemical indicator" patented technology

Chromogenic humidity sensor

The present invention relates to a humidity sensor, and more particularly, to a resistance film-type real-time chromogenic humidity sensor produced with a polyelectrolyte thin film. The humidity sensor according to the present invention is a chromogenic hygrometer in which a polyelectrolyte nano thin film that absorbs moisture is formed on a reflective layer, and the nano thin film varies terms of color and electrical resistance as moisture is absorbed and the thickness varies. The hygrometer according to the present invention is a dual-function hygrometer, the color and resistance of which vary. Provided is the chromogenic hygrometer in which the sensor made using a PSS-b-PMB thin film varies in color between purple, blue, green, yellow, orange, and red according to humidity at a very high response speed of within one minute.
Owner:POSTECH ACADEMY INDUSTRY FOUNDATION

Double-signal detection sugarcane pokkah boeng disease self-powered biosensor and preparation method thereof

The invention discloses a self-powered biosensor for double-signal detection of sugarcane pokkah boeng disease, the self-powered biosensor comprises an anode, a cathode and an electrolyte, the anode is a CuCo-MOF / AuNPs / GOD biological anode, the cathode is a CuCo-MOF / AuNPs / DNA chain biosensor, and the electrolyte comprises glucose, MB and a PBS buffer solution. According to the self-powered biosensor, analysis is carried out through two non-interfering modes of electrochemical detection and colorimetric detection, and whether a detection result is a false positive signal or not can be effectively verified. An external power supply is not needed, and real-time outdoor detection can be realized. The material source is wide, the assembly process is simple, and accurate and rapid detection can be realized. The method has the advantages of high sensitivity, good selectivity and real-time detection, and can be used for accurately detecting the sugarcane pokkah boeng rot.
Owner:GUANGXI UNIV FOR NATITIES +1

Preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I detection

The invention relates to a preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I. The preparation method comprises the following steps: 1) ultrasonically dispersing cobalt salt, selenium powder, chloroplatinic acid, urea and sodium chloride in an alcohol solvent, heating and stirring until the solvent is completely volatilized to obtain a solid mixture, and grinding the solid mixture into powder; and 2) placing the powder in a heating device, carrying out Joule heat treatment in an air atmosphere, washing a reactant, and carrying out vacuum drying to obtain the Pt monatomic nano-enzyme. Se doping is introduced in the one-step chemical reaction process to construct oxygen vacancies, rapid heating and structural shaping are achieved in combination with Joule heat treatment, the Se-doped Co3O4-loaded Pt monatomic catalyst is obtained, the oxygen vacancies and Se doping sites are synergistically used as anchoring sites, Pt monatomic atoms are effectively fixed, and the loading capacity and dispersity of the Pt monatomic atoms are improved. The obtained material shows excellent POD-like enzyme activity, can be used for constructing a high-sensitivity colorimetric immunoassay system, and realizes rapid and accurate detection of cTnI.
Owner:ZHEJIANG PROVINCIAL PEOPLES HOSPITAL

Portable water quality detection system with multi-sensor fusion, self-calibration and image recognition functions

The invention provides a portable water quality detection system based on multi-sensor fusion, self-calibration and image recognition, and relates to the technical field of water quality detection.Water quality parameters are collected through multi-sensor fusion, data are processed in combination with the deep learning self-calibration and image recognition technology, and a comprehensive water quality analysis result is generated; the system integrated communication module uploads data to a cloud end in real time, low-power-consumption power management is achieved, portable deployment of field and emergency scenes is supported, the detection accuracy, intelligence and real-time monitoring capacity are remarkably improved, and efficient water quality safety supervision is achieved.
Owner:张轩儒

Method for detecting pyridine in air

The invention relates to a method for detecting pyridine in air, a test paper sheet is placed in an air environment to be detected, the color change of the test paper sheet is observed, the pyridine concentration is qualitatively judged or quantitatively judged according to the color change of the test paper sheet, and the test paper sheet is made of a filter paper sheet and a zinc-based organic-inorganic hybrid halide material. According to the method, qualitative or semi-quantitative judgment of the pyridine concentration in the air can be performed by adopting a test paper sheet and a color card or a linear correlation model standard curve graph, so that whether the pyridine content in the air exceeds the standard or not or the exceeding amplitude can be monitored, and the method has the advantages of convenience in operation and more convenience in detection.
Owner:泉州医学高等专科学校

Visible spectrum noise reduction and heavy metal ion detection method

The invention relates to the technical field of spectral analysis, and discloses a visible spectrum noise reduction and heavy metal ion detection method, which comprises the following steps: reacting a water sample to be detected with a color developing agent to generate a color developing system, obtaining a gray spectrum signal through optical imaging equipment, carrying out variational mode decomposition, optimizing the signal by adopting singular value decomposition, and calculating the noise of the heavy metal ions. And determining an optimal reconstruction order by using a particle swarm optimization algorithm and reconstructing a signal, finally extracting a feature value from the denoised spectral signal, and predicting the type and concentration of metal ions through a neural network model. Spectral global / local features are modeled through cooperation of multi-head self-attention and learnable position coding, signal frequency-time domain cross-modal fusion is realized in combination with variational mode decomposition and cross attention, training parameters are dynamically optimized by innovatively adopting a reinforcement learning strategy, classification and regression tasks are self-adaptively balanced based on a gradient diversity reward mechanism, and frequency-time domain cross-modal fusion is realized. And finally, dual precision improvement of ion type identification and concentration prediction and model robustness enhancement are realized in a complex noise scene.
Owner:CHENGDU COLLEGE OF ARTS & SCI

Aptamer of enrofloxacin and ciprofloxacin, enzyme sensor and application thereof

The invention discloses a nucleic acid aptamer of enrofloxacin and ciprofloxacin, an enzyme sensor and application thereof, and belongs to the technical field of nucleic acid aptamers. The nucleotide sequence of the nucleic acid aptamer for the enrofloxacin and the ciprofloxacin is shown as SEQ ID NO.3. The invention also discloses application of the nucleic acid aptamer for the enrofloxacin and the ciprofloxacin in detection of the enrofloxacin and the ciprofloxacin. The enzyme sensor comprises the following components: nucleic acid aptamers of enrofloxacin and ciprofloxacin, an auxiliary chain H1, an auxiliary chain H2, an auxiliary chain H3, copper sulfate and a TMB (Tetramethylbenzidine) developing solution. The enzyme sensor is applied to detection of enrofloxacin and ciprofloxacin. The nucleic acid aptamer of the enrofloxacin and the ciprofloxacin is obtained through optimization and transformation and has higher affinity to a target, the Kd value of the nucleic acid aptamer to the enrofloxacin is 15 nM, and the Kd value of the nucleic acid aptamer to the CIP is 123 nM. The enzyme sensor disclosed by the invention can realize specific recognition of ENR and CIP, is high in sensitivity and has a wide application prospect.
Owner:OCEAN UNIV OF CHINA

A single-atom POD-mimicking enzyme nanomaterial, its preparation method, and food safety detection application

The present invention belongs to the technical fields of nanomaterials, analytical detection, and food safety, and specifically relates to a single-atom POD-mimicking enzyme nanomaterial, a preparation method thereof, and a food safety detection application. The single-atom POD-mimicking enzyme nanomaterial comprises a noble metal Os and a defective metal oxide, wherein the defective metal oxide is an oxide of metal Cu, and the Os is anchored on the defective metal oxide in the form of single atoms. The present invention also relates to the use of the single-atom POD-mimicking enzyme nanomaterial in the preparation of a detection reagent having POD activity and in the colorimetric detection of hydrogen peroxide or nitrite.
Owner:SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING

Application of CD4+CD8 + double-positive T cell in improvement of poor immune reconstruction of HIV infected patient

The invention discloses an application of CD4 + CD8 + double-positive T cells in improvement of poor immune reconstitution of HIV (human immunodeficiency virus) infected patients, and relates to the technical field of biological pharmacy, in particular to the application of preparation of the CD4 + CD8 + double-positive T cells in the poor immune reconstitution of the HIV infected patients. The number of peripheral blood CD4 + T cells of HIV infected patients is increased, the immune system of the patients is improved, and the probability of possible opportunity infection and other related diseases of the patients is reduced, so that the morbidity and mortality of the patients are reduced.
Owner:FIRST AFFILIATED HOSPITAL OF KUNMING MEDICAL UNIV

Preparation of bionic copper-based MOF nano-enzyme and application of bionic copper-based MOF nano-enzyme in hydroquinone detection

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.
Owner:JIANGXI AGRICULTURAL UNIVERSITY

Water quality total chlorine detection method and system

The invention relates to the technical field of water quality detection, in particular to a water quality total chlorine detection method and system.The method comprises the steps that firstly, the influence of environmental conditions on a chromogenic reaction is considered, and the environmental interference degree is determined through the temperature influence degree representing the overall temperature fluctuation change and the pH value influence degree representing the overall pH value standard deviation condition; then determining the chemical interference degree by characterizing the wavelength standard deviation and width of the maximum absorption peak which interferes with the influence of chemical substances and deviates and the number of redundant absorption peaks according to the influence of chemical conditions on the chromogenic reaction; determining a historical measurement error of the water quality total chlorine detector through a control variable method; the corrected water quality total chlorine concentration obtained by correcting the initial water quality total chlorine concentration by means of the environmental interference degree, the chemical interference degree and the measurement error is more accurate, and the accuracy of water quality total chlorine detection according to the obtained water quality total chlorine concentration is higher.
Owner:HUNAN KERTONE WATER TREATMENT CO LTD

Imine molecular sensor with five-detection function, two-component gel and preparation method and application of two-component gel

The invention relates to the technical field of organic material detection, in particular to an imine molecular sensor with a five-detection function, two-component gel as well as a preparation method and application of the imine molecular sensor. The imine molecular sensor has three signal responses of fluorescence on-off, ultraviolet absorption and color change to Fe < 3 + >, Co < 2 + > and Ni < 2 + > in a solution state, and has ultraviolet absorption and fluorescence on-off dual-detection performance to acid and alkali changes; the imine molecular sensor and cholesteryl half ester can form two-component gel through a heating-low-temperature ultrasonic cooling method; after Fe < 3 + >, Co < 2 + >, Ni < 2 + >, NaOH and HCl are respectively added, the orange of the gel becomes milky white, reddish brown, transparent red, milky white and milky white under sunlight, and the fluorescence of the orange of the gel disappears under an ultraviolet lamp, so that the rapid and sensitive detection of Fe < 3 + >, Co < 2 + >, Ni < 2 + >, acid and alkali under two states of the imine molecular solution and the gel is realized. The imine molecular sensor provided by the invention has the advantages of mild synthesis conditions, simple preparation and the like, and creates favorable conditions for popularization and application of the imine molecular sensor.
Owner:DEZHOU UNIV

Micro-reagent ammonia nitrogen on-line continuous analyzer and analysis method

The invention discloses a micro-reagent ammonia nitrogen on-line continuous analyzer and an analysis method, and belongs to the technical field of water quality ammonia nitrogen monitoring, the micro-reagent ammonia nitrogen on-line continuous analyzer comprises a first injection pump, a second injection pump, a multi-channel valve, a liquid storage ring and a reaction tank; liquid outlets of the first injection pump and the second injection pump are respectively connected with one end of the liquid storage ring and a circulating port of the reaction tank through different channels of the multi-channel valve; a circulating port of the reaction tank is connected with a first peristaltic pump; the other end of the liquid storage ring is connected with a second peristaltic pump; liquid outlets of the first injection pump and the second injection pump are connected with a third peristaltic pump; a first reagent and a second reagent for ammonia nitrogen analysis are respectively stored in the first injection pump and the second injection pump; different channels of the multi-channel valve are respectively connected with a standard sample and a water sample which are used for ammonia nitrogen analysis, and cleaning water. The micro-reagent ammonia nitrogen on-line continuous analyzer provided by the invention can reduce cross contamination of reagents, reduce reagent consumption and realize short-interval continuous analysis.
Owner:NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES

Colorimetric / fluorescent dual-mode sensor as well as preparation method and application thereof in histamine detection

The invention provides a colorimetric / fluorescent dual-mode sensor, a preparation method of the colorimetric / fluorescent dual-mode sensor and application of the colorimetric / fluorescent dual-mode sensor in histamine detection. The colorimetric / fluorescent dual-mode sensor comprises a horseradish peroxidase-loaded metal organic framework (HRP-AIE-MOF), hydrogen peroxide and a chromogenic substrate o-phenylenediamine (OPD), horse radish peroxidase (HRP) in the HRP-coated AIE-MOF can oxidize colorless OPD into yellow 2, 3-diaminophenazine (DAP), an ultraviolet absorption peak is generated at 425 nm, a strong fluorescence emission peak is generated at 555 nm, the HRP-coated AIE-MOF has a strong fluorescence emission peak at 450 nm, and the HRP-coated AIE-MOF and a fluorescence signal of the DAP can form a ratio fluorescence sensor. According to the invention, the excellent catalytic ability of natural enzyme and the luminescence characteristic of AIE-MOF are integrated in one system, and high-sensitivity histamine detection is realized.
Owner:SHANGHAI OCEAN UNIV

Application of iron-ruthenium nano-enzyme in preparation of nucleic acid detection product

The invention discloses application of iron ruthenium nano-enzyme in preparation of nucleic acid detection products, and belongs to the technical field of biological detection and nano-materials. The RIN has stable peroxidase-like (POD) activity, and can catalyze a chromogenic reaction between 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) and hydrogen peroxide (H2O2). The catalytic activity of the nano-enzyme can be selectively inhibited by pyrophosphate (PPi) generated in a nucleic acid amplification reaction, so that visual colorimetric analysis on whether target nucleic acid exists or not is realized. In combination with a polymerase chain reaction (PCR) system, the invention constructs a new nucleic acid detection strategy which does not need fluorescence labeling, is simple and convenient to operate and has high sensitivity. Through verification, the system can be widely applied to rapid on-site screening and visual interpretation of related nucleic acid of drug-resistant pathogens (such as ESKAPE flora) and the like, and has a good application prospect.
Owner:BEIJING UNIV OF CHEM TECH

Kit for breast cancer diagnosis and application thereof

The invention belongs to the technical field of biological medicine, and particularly relates to a kit for breast cancer diagnosis and application thereof. The kit comprises an elisa plate coated with a captured antibody and an HRP labeled antibody working solution, the capture antibody is a monoclonal antibody T2X-1 of an anti-PSTPIP1 protein; the HRP labeled antibody is a monoclonal antibody Z4Y-2 of an anti-PSTPIP1 protein, and the HRP labeled antibody is a monoclonal antibody Z4Y-2 of an The heavy chain amino acid sequence of the monoclonal antibody T2X-1 is as shown in SEQ ID NO.1, and the light chain amino acid sequence of the monoclonal antibody T2X-1 is as shown in SEQ ID NO.2; the heavy chain amino acid sequence of the monoclonal antibody Z4Y-2 is as shown in SEQ ID NO.3, and the light chain amino acid sequence of the monoclonal antibody Z4Y-2 is as shown in SEQ ID NO.4. The kit for breast cancer diagnosis provided by the invention can be used as an auxiliary diagnosis means for breast cancer with high expression of PSTPIP1 protein, and has high diagnostic value.
Owner:BEIJING OBSTETRICS & GYNECOLOGY HOSPITAL CAPITAL MEDICAL UNIV +1

Peritoneal dialysis solution detection data intelligent analysis method based on visual identification

The invention provides a peritoneal dialysis solution detection data intelligent analysis method based on visual identification, and the method comprises the steps: obtaining a to-be-identified test paper image, carrying out the test paper region segmentation and color correction of the test paper image, and carrying out the brightness equalization processing of a test paper detection region, and obtaining a processed test paper detection region; obtaining a standardized color feature vector of a test paper color development area from the test paper detection area; carrying out mapping matching on the standardized color feature vector and a standard colorimetric database to obtain a colorimetric matching value, carrying out color abnormality identification according to the colorimetric matching value, comparing the color abnormality with a preset abnormal value to obtain a test paper colorimetric analysis result, and carrying out self-adaptive correction on the test paper colorimetric analysis result with abnormality; and constructing a personalized colorimetric model according to the colorimetric matching value in combination with a historical colorimetric matching value, and performing health trend analysis and early warning.
Owner:THE FIRST AFFILIATED HOSPITAL OF SUN YAT SEN UNIV +1

Citric acid-based fluorescent dye for distinguishing dead cells from living cells as well as preparation method and application of citric acid-based fluorescent dye

The invention relates to the technical field of fluorescent dyes, in particular to a citric acid-based fluorescent dye for distinguishing dead cells from living cells as well as a preparation method and application of the citric acid-based fluorescent dye. The invention discloses a citric acid-based fluorescent dye for distinguishing dead cells from living cells. The citric acid-based fluorescent dye comprises at least one of a compound 1 and a compound 2, the citric acid-based fluorescent dye can specifically enter dead cells and specifically dye cytoplasm of the dead cells, so that the dead cells can be dyed or imaged. The citric acid-based fluorescent dye is difficult to dye living cells, so that dead cells and living cells can be quickly and accurately distinguished, and the citric acid-based fluorescent dye can be applied to the field of biological medicines.
Owner:WESTLAKE UNIV

Sample preservation solution for vagina micro-ecology detection and preparation method of sample preservation solution

The invention relates to the technical field of biology, in particular to a sample preservation solution for vagina micro-ecology detection and a preparation method of the sample preservation solution. The invention relates to a sample preservation solution for vaginal micro-ecology detection. The sample preservation solution comprises the following components in percentage by mass: 0.5-0.9% of paraformaldehyde, 0.08-0.12% of glutaraldehyde, 10-18% of a buffer solution, 0.1-0.4% of inositol, 1-10% of a stabilizer, 0.8-5% of a cell treatment agent and the balance of water, the stabilizing agent is prepared from sodium alginate, tween-20 and beta-cyclodextrin. The invention aims to solve the problems of high false negative and false positive rate or difficulty in interpretation caused by liquid-based cell accumulation, unstable subsequent dyeing and decoloration time and the like of a cell preservation solution in the prior art, so that the sample preservation solution for sample cells can keep the forms of cells, protozoa and the like unchanged, and ensures that gram staining negative and positive properties of bacteria and fungi are not changed. The staining and decoloring are relatively stable, the false negative and false positive rate of sample cell detection is effectively reduced, and the sample cell lesion detection and judgment are more accurate.
Owner:SUZHOU TURING MICROBIAL TECH CO LTD

Nano-enzyme, preparation method and method for detecting glucose by using nano-enzyme

The invention relates to the field of nano-enzymes, in particular to a nano-enzyme, a preparation method and a method for detecting glucose by using the nano-enzyme. The nano-enzyme comprises a carrier and platinum nano-particles coated on the surface of the carrier, and the carrier is oxidized nano-diamond particles with the particle size of 20-30 nm. The core structure of the nano-enzyme, namely a composite system of the carrier and the platinum nano-particles, is defined, the platinum nano-particles serve as a metal nano-material with excellent catalytic performance and are a core component for simulating peroxidase activity, the size of the oxidized nano-diamond carrier is controlled to be 20-30 nm, the dispersity of the material is guaranteed, and the catalytic activity of peroxidase is improved. And the catalytic efficiency of the composite system can be further improved through a size effect. According to the structural design, the problems of insufficient catalytic activity and poor stability of a single nano material are solved through the synergistic effect of the carrier and the load component, and a material foundation is laid for subsequent efficient glucose detection.
Owner:JIANGSU YINGTIAN CHEM

Devices, systems and methods for detecting microbial activity

Disclosed herein are devices and systems for detecting microbial activity. A device (100) for detecting microbial contamination comprises a light source (20) that is configured to be optically coupled to an optical element (10), the optical element comprising a waveguide (2) and a diffraction grating (4), that together support a plurality of guided mode resonances at selected wavelengths of light from the light source. The device also comprises a condensing wall (40) having a condensing surface (50) on which liquid in gas (vapour) can condense, wherein the condensing surface is shaped, or engineered, to support flow of condensed liquids under gravity towards a collecting point (55) where the liquid can pool (6) around the optical element. The device further comprises a detector (30) configured to detect a property of a resonant guided mode of the plurality of resonant guided modes thereby to detect the presence or absence of microbes in the liquid that pools around the optical element.
Owner:PROCTER & GAMBLE CO

Responsive aerogel and application thereof

The invention relates to the technical field of gas detection, in particular to response type aerogel and application thereof. The response type aerogel is prepared according to the following steps: mixing and dissolving a metal organic framework material and lead acetate to obtain an adsorption and response integrated probe; mixing silk fibroin, polyethylene glycol diacrylate and the adsorption-response integrated probe, and performing light curing reaction under the action of a photo-crosslinking agent to obtain the adsorption-response integrated probe. Wherein a double-grid aerogel substrate generated by reaction of silk fibroin and polyethylene glycol diacrylate can adsorb water molecules in environments with different humidity to wet the substrate, and a saturated microscopic water environment is provided for colorimetric reaction on the surface of a pore wall, so that interference of environmental humidity on response is effectively relieved. The quantitative method established by using the response type aerogel can be used for high-sensitivity quantitative detection of hydrogen sulfide in livestock and poultry farms.
Owner:ZHEJIANG UNIV

Titration end point judgment method based on machine vision

The invention relates to the technical field of machine vision, in particular to a titration end point judgment method based on machine vision. The method comprises the following steps: acquiring a solution image set in a titration process through a high-resolution camera, and performing bilinear Laplace illumination correction to obtain an initial titration solution image set; performing data preprocessing and enhancement on the initial titration solution image set to obtain a to-be-analyzed titration solution image set; performing solution color dynamic change mode dynamic feature integration according to the to-be-analyzed titration solution image set to obtain a solution dynamic feature set; acquiring historical titration experiment data, and constructing a solution end point state prediction model based on the solution dynamic feature set and the historical titration experiment data; acquiring a real-time titration solution image set; and performing solution state prediction on the real-time titration solution image set through the solution end point state prediction model, and adjusting the titration speed until the titration solution reaches the end point state. The precision and efficiency of solution titration can be improved.
Owner:SUZHOU CHUANG CHUANG ENVIRONMENTAL PROTECTION TECH CO LTD

Rapid detection kit for concentration of fluorine ions in water and use method of rapid detection kit

The invention belongs to the field of rapid detection of environment-friendly water quality, and particularly relates to a kit for rapidly detecting the concentration of fluorine ions in water and a use method thereof. The invention discloses a rapid detection kit for the concentration of fluorine ions in water. The rapid detection kit comprises a fluorine ion rapid detection reagent, a fluorine ion rapid detection color card, a detection accessory and a use method of the rapid detection kit. According to the invention, tedious operations such as solid powder, dangerous organic solvent and multi-step pipetting addition are not needed, the device is convenient to carry, and rapid, simple, high-precision and high-interference-resistance fluorine ion detection of non-specialized personnel under field conditions is realized.
Owner:SHENZHEN FINK INSTRUMENT CO LTD

Dynamic leaching-spectrophotometric detection method for nutrient release rate in slow-release fertilizer

The invention discloses a dynamic leaching-spectrophotometric detection method for the release rate of nutrients in a slow-release fertilizer, and relates to the field of agrochemical analys.The detection method comprises the following steps that S1, a slow-release fertilizer sample is placed in a leaching column to be leached, and leachate is collected; s2, sequentially adding a masking agent solution and a chromogenic reagent into the leachate, and carrying out chromogenic reaction; s3, pumping the solution into a double-optical-path flow cell, and measuring absorbance values under a target nutrient characteristic absorption wavelength and a background interference characteristic wavelength; s4, calculating the corrected net absorbance; and S5, calculating the nutrient concentration, and drawing a nutrient release kinetic curve. By adopting a dual-wavelength synchronous detection and real-time dynamic subtraction correction algorithm, the method can eliminate system errors of time-varying background chromaticity, so that accurate and reliable absorbance readings can be obtained at the initial stage of nutrient release even if the nutrient concentration in the leachate is very low, thereby ensuring the authenticity of the initial stage of a release curve and improving the accuracy of nutrient release. And initial release kinetic parameters are accurately captured.
Owner:江苏省农产品质量检验测试中心

Gas tightness detection device for fuel cell stack

The invention relates to the technical field of air tightness detection, and discloses a fuel cell stack air tightness detection device, which comprises a fuel cell stack main body, an air inlet pipe is installed on the outer wall of the fuel cell stack main body, and the outer wall of the air inlet pipe is sleeved with an air collection airbag. A driving gear is driven by an air pump to rotate through a rotating rod, a gear ring can be driven to rotate on the inner wall of a shell, a plurality of driving gears start to rotate, racks can move in the directions of the driving gears under the rotation of the driving gears, the vertexes of six moving plates can make contact with one another, and the moving plates can move in the directions of the driving gears. Therefore, the outside can be separated from the inner wall of the air inlet pipe, external air can be effectively prevented from continuously entering the inner wall of the fuel cell stack main body, gas waste can be effectively prevented, the safety and reliability of a fuel cell are ensured, gas leakage can be effectively reduced by quickly stopping gas charging, and the safety of the fuel cell stack is improved. Therefore, the risk of fire disasters or explosions is reduced.
Owner:YANTAI HAORUN ENERGY TECH CO LTD

Visual detection method for generation of interface water microdroplet induced electrons in high-temperature and high-pressure hydrocarbon-water system

The invention provides a visual detection method for interface water droplet induced electron generation in a high-temperature and high-pressure hydrocarbon-water system, and belongs to the technical field of in-situ analysis of electrons in mixed fluid. The detection method comprises the following steps: preparing a fused quartz capillary reaction cavity; loading a sample in a fused quartz capillary reaction cavity: sequentially inserting a thin capillary syringe filled with a silicomolybdic acid aqueous solution and a thin capillary syringe filled with a hydrocarbon liquid into the fused quartz capillary reaction cavity, and injecting the silicomolybdic acid aqueous solution and the hydrocarbon liquid; and carrying out visual detection on the water droplets. Through the visual fused quartz capillary thermal simulation experiment device, the color change of the water droplets at the interface of the silicomolybdic acid aqueous solution and the hydrocarbon fluid under the conditions of high temperature and high pressure is visually displayed, and the color characteristics of the water droplets are observed in real time by using a microscope, so that whether the water droplets induce electron generation or not is judged; the problem that electrons generated by water droplets cannot be directly observed and detected under high-temperature and high-pressure conditions is solved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Mixed strain fermentation method for efficient conversion of non-medicinal parts of traditional Chinese medicine

The invention relates to the technical field of Chinese herbal medicine fermentation, and discloses a mixed strain fermentation method for efficient conversion of non-medicinal parts of traditional Chinese medicine, which comprises the following steps: constructing an intelligent fermentation system comprising a plurality of independent fermentation units, respectively culturing different strains such as aspergillus niger, bacillus subtilis, saccharomyces cerevisiae and the like in each fermentation unit, the online sensor is integrated in the system and used for monitoring key fermentation parameters in real time, and a fermentation model and an optimization algorithm are arranged in the system and can automatically adjust fermentation conditions. An intelligent fermentation system comprising a plurality of independent fermentation units is constructed, precise classification pretreatment and mixing according to a specific ratio are carried out on rhizoma polygonati stems and leaves and gentian stems and leaves, and an intelligent control system is utilized to dynamically regulate and control the fermentation process, so that the synergistic effect of different strains such as aspergillus niger, bacillus subtilis and saccharomyces cerevisiae is fully exerted, and the fermentation efficiency is improved. The dissolution rate and the conversion rate of active ingredients in the non-medicinal part of the traditional Chinese medicine are improved.
Owner:SHENYANG INST OF TECH