138results about How to "Easy to detect and analyze" patented technology

The invention relates to a pretreatment method for purifying dioxin, polychlorinated biphenyl and polybrominated diphenyl ether in extract liquor. Purifying columns which respectively comprise a compound silicagel column, an alkaline aluminium oxide column and a Florisil column are arranged on an extraction module of a full-automatic solid-phase extractor, wherein fillers in each compound silicagel column comprise the following materials from bottom to top in sequence: silica gel, alkaline silica gel, silica gel, acidic silica gel and anhydrous sodium sulfate, and an eluent is normal hexane; fillers in the alkaline aluminium oxide column comprise the following materials from bottom to top in sequence: alkaline aluminium oxide and anhydrous sodium sulfate, and an eluent is mixed liquor of normal hexane and dichloromethane; fillers in the Florisil column comprise the following materials from bottom to top in sequence: Florisil and anhydrous sodium sulfate, the eluent is divided into two types according to the sequence of the steps, the eluent in the first step is the mixed liquor of normal hexane and dichloromethane, and the eluent in the second step is dichloromethane; and among all purifying columns, the eluents are transferred to an online concentrator for evaporation and concentration, and then are transferred to the next purifying column for purifying and treating.

The invention discloses a method for human shielded contour detection based on rotational depth learning. Firstly, the initial segmentation of an image is obtained by dividing and merging an input person image, and a segmentation contour of a target is extracted by regional merging of the color and the content; secondly, according to a rotation angle set, the image is rotated, sampled and labeledto obtain an edge image block set, based on a convolutional neural network, a depth model of the edge orientation detection is constructed, and a rotation image block acquisition set is used to traina shallow layer model and a deep layer model; and finally, the trained depth model of the edge orientation detection is used to detect the local contour orientation, the local contour orientation is evaluated for consistency, and the character segmentation contour orientation is extracted.

The invention belongs to the technical field of marine product detection, and particularly relates to a method for determining the trace amount of organic tin in marine products. The method comprises the steps that a to-be-determined sample is ground into powder after being preprocessed, the powder is soaked, extracted, frozen, purified, derived, processed through a cleanert florisil column and concentrated to obtain a to-be-determined sample solution; series of different-concentration organic tin mixed standard solutions are added in equivalent blank matrixes same as a sample matrix, soaked for a certain time and then processed through the mode same as the sample; a gas chromatography-tandem mass spectrum detection system is adopted to determine the standard mixed solutions, and a working curve is drawn; the to-be-determined sample solution is determined, the peak area ratio is obtained from a chromatogram chart of the to-be-determined sample solution, regression is performed on the working curve to obtain regression values, and then the concentration of all target objects in the to-be-determined sample can be calculated. The detection method can determine the concentration of butyltin and triphyltin simultaneously, is sensitive, accurate, rapid, simple and convenient and can be applied to detection of the organic tin in the marine products.

The invention discloses a fluid-solid interface wave based sediment concentration detection device and a detection method, and belongs to the technical field of ultrasonic detection and analysis. Fluid-solid Schotle waves are generated by a signal sending module at an excitation measurement side of an excitation signal module and are propagated along a bed, and fluid-solid Schotle wave signals are received by a signal receiving module; the received signals pass through a signal processing module, and then the average velocity of the Scholte waves is extracted and is processed by an algorithmmodule to obtain the average sediment concentration in a measurement range of the bottom of the detected river. The detection method provided by the invention has a large one-time detection range, and an average effect in a wave propagation range is detected by the fluid-solid Schotle waves because the sediment concentration of small regions is possibly different, accordingly, the overall macro detection and analysis are favorable; the method provided by the invention is favorable for real-time detection without sampling for re-detecting; and the relative amplitude of fluid-solid interface waves is large, so that the measurement accuracy of ultrasound can be relatively improved.

The invention relates to a preparation method of an immunoaffinity chromatography medium and an application in tetraodotoxin purification. The preparation method of an immunoaffinity chromatography medium comprises the following steps of: activating a solid-phase carrier through a cyanogen bromide method; coupling a tetraodotoxin specific antibody to the swelled activated solid-phase carrier; sealing the immunoaffinity chromatography medium; and washing the immunoaffinity chromatography medium. The method for purifying tetraodotoxin by using the immunoaffinity chromatography medium comprises the following steps of: pretreating a sample containing tetraodotoxin; preparing a tetraodotoxin immunoaffinity chromatography column; loading the sample; eluting the column; and collecting the elution liquid. The immunoaffinity chromatography medium provided by the invention has high selectivity, strong retention and concentration capability on tetraodotoxin in the sample, water-phase operation, easiness in operation and good purification effect, the immunoaffinity chromatography column can be used repeatedly, a large amount of solvent can be saved, and analysis cost and environmental pollution are reduced.

The invention discloses a method for determining glucose based on a paper-based electrochemical device. The method comprises the following steps that 1, filter paper serves as a detection platform of a paper-based substrate, an electrode is manually drawn with a pencil, and graphite serves as an electrode material, wherein the detection platform comprises two areas, namely a detection area and an enzyme area, each area is provided with a round hydrophilic area, and the part except the hydrophilic area is a hydrophobic area; 2, according to the principle of glucose oxidase oxidizing reaction, ferrocenecarboxylic acid serves as an electronic mediator, glucose is determined by adopting an amperometric method, and the detection platform can sensitively determine the glucose in the presence of interferent; a sample to be detected is added to the detection platform, and the actual blood sugar concentration of the sample can be detected. The paper-based electrochemical system adopted in the method is the novel electrochemical device, the electrochemical device is simple in manufacture and low in cost and can be used in lots of application fields including portable and disposable analytical equipment for clinical diagnosis, food quality control, environment monitoring and the like.

The invention discloses an application of an electrochemiluminescence biosensor based on cytosine (C)-containing cyclic DNA sequences where in-situ reduced Ag nano-clusters are enriched as signal probes and adopting dual amplification strategy to detection of target thrombin. According to the technical scheme, DNA cleavage enzyme with hairpin DNA recognition capability and catalysis effect is designed, when target thrombin exists, hairpin DNA is opened, and substrate DNA is cleaved under the action of Zn<2+>; a large quantity of cytosine (C)-containing cyclic DNA sequences are aggregated through HCR (hybridization chain reaction), in-situ reduction of AgNO3 is performed on the electrode surface by NaBH4, a large quantity of Ag nano-clusters are formed, and the electrochemiluminescence biosensor with dual amplification effect is prepared. The sensor is subjected to luminescence detection, and a linear relation is formed between light-emitting signals and concentration of a to-be-testedsample. The Ag nano-cluster signal probes and the DNA dual amplification technology are combined for rapid and high-sensitivity detection of thrombin, and the electrochemiluminescence biosensor has great application potential in early clinical analysis and detection.

The invention relates to submerged plant and algae coculture equipment, belonging to the field of water treatment. The submerged plant and algae coculture equipment is an experimental apparatus for simulating the living environment of submerged plants and algae and testing the condition of influence of the submerged plants on the growth metabolism of the algae. The submerged plant and algae coculture equipment comprises supporting equipment, culture equipment, lighting equipment and aeration equipment, wherein for the supporting equipment, a steel frame (1) of which the bottom is provided with four universal wheels (6) is used for placing other three sets of equipment; for the culture equipment, a water tank (2) with a tank cover (3) is used for simulating a river body to ensure the submerged plants and the algae to live, an air vent (8) on the cover can be communicated with the aeration equipment, and one side of the water tank is provided with sampling holes (7) so that samples at different water heights can be extracted; for the lighting equipment, a lamp tube (5) fixed on the steel frame provides light for the submerged plants and the algae and the lighting time and the strength can be regulated; and for the aeration equipment, an inflator pump (4) supplies oxygen to the submerged plants and the algae the oxygen supply can be regulated by regulating the operation time of the pump. The equipment occupies a small area, is convenient to move and has stable operation environment.

The invention relates to an image detection and identification device for a safety production line. According to the technical scheme, the image detection and identification device comprises a conveying device, a power track, an auxiliary track, an image identification frame, an image processing and sending device, an image motion acquisition frame, a camera motion table and a conveyor belt motor.According to the image detection and identification device, multi-angle fixed-point snapshot is carried out through the image identification frame, image acquisition of all parts of a product is completed, image detection and identification are carried out, then the product with a problem is tracked and shot through a tracking camera on the camera motion table according to the first detection condition, so that the camera and the product are relatively static, clearer and more stable image information can be obtained, and further detection and analysis of the product are facilitated. By adopting a double image detection and analysis and following shooting mode, the accuracy of image detection and identification can be improved, and the conveying speed of the product is not influenced in the whole detection process, so that the production efficiency of the production line is guaranteed.

The invention discloses a quality detection device and method of an encapsulation LED solder joint. The device comprises a current source, a sample holder, a current detection unit, a photoelectric detector, a data acquisition card and a computer; the current source drives the LED on the sample holder to work; the current detection unit obtains instantaneous current occurring by switching the LED and outputs the instantaneous current to the computer; the photoelectric detector is arranged in front of the sample holder to collect an optical signal sent by the LED and converts the optical signal into an electrical signal; the output end of the photoelectric detector is connected with the data acquisition card; the data acquisition card is connected with the computer; the data acquisition card obtains the electrical signal output by the photoelectric detector and outputs the electrical signal to the computer; and the computer processes and analyzes the measured photoelectrical data to evaluate the quality of the LED solder joint. The invention utilizes a new quality detection method of an encapsulation LED solder joint; and according to the instantaneous current occurring by switching the LED and response curve of light intensity, fall time and stable amplitude are obtained to be compared with preset thresholds, namely the soldering quality of an LED product can be identified so as to realize nondestructive testing of the quality of the solder joint.

The present invention relates to the field of measurement of short chain chlorinated paraffin and particularly relates to a method for measuring short chain chlorinated paraffin in a high polymer material. The method comprises the following steps: dedusting the high polymer material; shearing the dedusted high polymer material into pieces, putting the pieces in a round-bottom flask, and heating the pieces to a molten state; pouring the molten high polymer material into a first reaction container, adding cyclohexanone in twice, oscillating and filtering; adding mixed liquor of ethyl acetate and amyl acetate into a second reactor, oscillating and filtering; adding mixed liquor of acetone/normal hexane/ dichloromethane with a volume ratio of 1:2:1, and oscillating and concentrating the mixed liquor in an ultrasonic oscillator; spraying the concentrated solution onto a chromatographic column, leaching and receiving eluant; feeding the eluant into a chromatographic column from the sample feed opening of a metastable atom bombardment high-resolution mass spectrometer to realize mass spectrometric detection. According to the invention, the main components and the added components in the high polymer material are fully separated to improve the detection efficiency and accuracy of the short chain chlorinated paraffin.

The invention discloses a surface defect detection line light source which comprises a seat body, a light-emitting diode (LED) luminous source and a cylindrical convex lens, wherein the seat body is provided with a luminous source mounting groove along an extension direction; the LED luminous source is obliquely arranged in the mounting groove and has a variable angle; and the cylindrical convex lens and a notch of the mounting groove are configured and the cylindrical convex lens is detachably arranged in the notch. According to the surface defect detection line light source, the detection effect can be effectively improved.

The invention provides a SSR primer pairs, which contain three pairs of SSR primers, namely HVM68, Bmag0007 and EBmac755. The invention also provides a method for high-throughput malt purity identification by the utilization of the SSR primer pairs. The method comprises the following steps: extracting DNA of test samples, carrying out multiplex PCR amplification by the use of SSR labeled with different fluorescent dyes, and carrying out capillary electrophoresis fluorescence detection and data analysis. By SSR band analysis after PCR amplification of the three pairs of SSR primers, a malt variety fingerprinting database can be established. The capillary electrophoresis and SSR marker combined high-throughput malt purity identification method is established. By the method, results are stable and reliable, detection efficiency is raised, lots of samples can be rapidly determined within a short period of time, and the results can be used as judgment basis of commercial arbitration. Therefore, adulteration and selling fakes of malt are eliminated, and product quality of beer brewing enterprises is guaranteed from the source.

The invention discloses a raw material formula of a hydrophilic interaction electrochromatographic monolithic column and a method for preparing the same by the raw material formula. The raw material formula comprises the following components by weight percent: 12-25% of neutral compound monomer, 10-18% of cross-linking agent, 2-15% of hydrophilic compound monomer, 50-65% of pore-forming agent and 0.1-0.4% of initiator, wherein the hydrophilic compound monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy) ethyl-butyl ammonium]propane-1-sulfonate or 2-acrylamido-2-methylpropane sulfonic acid (AMPS). The electrochromatographic monolithic column can analyze and detect the small molecule polar compound such as melamine. The test shows that the detection limit uses signal-to-noise ratio 3 as indicator, the detection limit of the monolithic column is 0.05mg/L, the quantitation limit uses signal-to-noise ratio 10 as indicator, the quantitation limit is 0.1mg/L, and the accuracy is good.

The invention relates to a method of ultrafast detection of antibiotic substances by combined voltage driven solid phase microextraction-raman spectroscopy. The method comprises the following steps: taking a nano golden particle wrapped porous silver wire as a working electrode, a saturated calomel electrode as a reference electrode and a platinum electrode as a counter electrode to form an electrode system, putting the electrode system in a water sample to be detected, applying -0.05 to -0.2V voltage to the electrodes, quickly enriching the antibiotic substances in the water sample onto the working electrode due to voltage driving to achieve in-situ solid phase microextraction, and performing exciting irradiation on the surface of the working electrode through a raman spectrometer for raman spectroscopy. The method increases a diffusion rate of the substances to be detected in the water sample; the nano golden particle wrapped porous silver wire is specific to the antibiotic substances, so that the antibiotic substances are enriched onto the working electrode directionally selectively; the enrichment detection speed is greatly increased; and actual applications in quick field detection and water sample pollutant surveillance are achieved.

The present invention provides a sampling device for extracting smoke from high-temperature flue gas. The device comprises a collecting assembly, a filtering assembly, a supporting assembly and a water curtain assembly. By applying the technical scheme, the effect that the overall structure is precise and simplified is achieved; water flow is guided by a flow limiting curved surface and a flow guiding surface in the water curtain assembly, and the minimum cross-sectional position between the flow limiting curved surface and the flow guiding surface is changed along with water flow speed conditions; when the water flow flows through a gap between the flow limiting curved surface and the flow guiding surface, it can be ensured that the water flow at an outlet stays in a flowing downward state, and a uniform water curtain is formed along the circumference; when the flue gas passes through the water curtain, the smoke carried in the flue gas is captured by the water curtain, and collectionof the smoke is facilitated; the smoke carried in the high-temperature flue gas is captured by the water curtain, then falls into the collecting assembly along with the water curtain and is quenchedby water so that a further chemical reaction of the smoke can be prevented, and therefore original material phase compositions of the smoke is maintained. Through design of the filtering assembly, thewater and a smoke sample can be effectively separated, and convenience is provided extraction of the smoke sample.

Disclosed is an oil level detecting device for a compressor. The oil level detecting device comprises a shell (1), a bottom cover (2), a top cover (3), a oil pool (4) storing compressor lubricant oil, a first connecting pipe (5), a second connecting pipe (6), a connecting terminal (7), a power source device (8), a tank body (9), a floating element (10), a conductive partition plate (11) and a cavity (12) excluding oil pool inside the compressor. One end of the tank body (9) is communicated with the compressor oil pool (4), and the other end of the tank body is communicated with the compressor cavity (12). The floating element (10) can float above compressor refrigerant oil. When the oil level change in the tank body (9) is over a setting value, displacement of the floating element (10) drives the conductive partition plate (11) to be contacted with or separated from the connecting terminal (7). Under the condition that the power source device (8) is powered on, a continuous electric signal is outputted when the conductive partition plate (11) is contacted with the conductive connector (7), and the electric signal is cut when the conductive partition plate (11) is separated from the connecting terminal (7). The oil level in the compressor can be judged by means of electric signal detection.