94results about How to "The preprocessing method is simple" patented technology

The invention relates to improvement on an imidacloprid pesticide wastewater treatment method. The imidacloprid pesticide wastewater treatment method is characterized by comprising the following steps of: performing physical and chemical pretreatment, namely performing chemical phosphorus removal and ferrum-carbon (Fe-C) micro-electrolysis sequentially and then performing Fenton oxidation and catalytic oxidation respectively; and performing biochemical treatment, namely performing aerobic biochemical treatment in the presence of salt-tolerant aerobic bacteria. By the imidacloprid pesticide wastewater treatment method, the total physical and chemical treatment effect is greatly improved; physical and chemical pretreatment can be performed at normal temperature and normal pressure; organic matters difficult to biochemically degrade is degraded and the biochemical property of the wastewater is improved under the condition of low cost; the dilution factor of the wastewater is greatly reduced; and the using amount of diluting water is reduced by 50 to 80 percent, so that the treatment is more economic. The imidacloprid pesticide wastewater treatment method is simple in pretreatment method, mild and stable in process reaction condition, simple in operation (for example, the catalytic oxidation can be performed at normal temperature and normal pressure and a catalyst can be recycled), low in operating cost, good in treatment effect, low in the using amount of the diluting water during the subsequent biochemical treatment and low in total treatment cost, and the water from the biochemical treatment can reach a national level 1 of discharge standard.

The invention relates to a second-order mass spectrometric detection method for bisphenol substances in a water environment, and belongs to the field of bisphenol substance detection. The problems that an existing analysis method for bisphenol pollutants is low in accuracy and precision due to interference of a natural water body matrix are solved. According to the second-order mass spectrometric detection method for the bisphenol substances in the water environment, an HLB column is adopted for solid-phase extraction, an amino column is purified, a full scanning mode is selected and used for qualitative and quantitative detection, all target objects used in a sample can be detected out at the same time by means of the mode, the mode is used for analyzing trace substances in a complex matrix, and for each substance, only one or two specific pairs of parent ions and daughter ions are selected to be detected. Matrix interference can be effectively removed, and sensitivity of detection and accuracy of qualitation and quantitation are improved.

The invention relates to a screen image quality evaluation method based on sparse representation, comprising the following steps: first, calculating three kinds of gradient maps of distorted screen images, including absolute gradient maps, relative gradient patterns and relative gradient maps; Step 2: extracting the texture features of the screen image, and extracting the gradient direction histogram features from the absolute gradient image, the relative gradient direction image and the relative gradient image obtained in step 2. constructing a learning dictionary; performing sparse representation of the feature vector of the test screen image. Step 5: a pooling stage of mass fraction. The screen image quality evaluation method provided by the invention accurately predicts the quality fraction after the screen image is distorted by using the image second-order partial derivative information and the sparse representation.

The invention relates to a full-reference virtual-reality video quality evaluation method based on convolutional neural networks. The method comprises the steps that video preprocessing is conducted,wherein VR differential videos are obtained by means of a left view video and a right view video of a VR video, frames are uniformly extracted from the differential videos, each frame is cut into blocks in a non-overlapping mode, and a VR video patch is formed by the video blocks at the same location of each frame; two convolutional neural network models with the same configuration are built; theconvolutional neural network models are trained, wherein by means of a gradient descent method and by taking the VR video patches as the input, each patch is accompanied by an original video quality score to serve as a tag, the tags are input to the networks in batches, the weights of various layers of the networks are fully optimized after multiple times of iteration, and finally the convolutional neural network models capable of being used for extracting virtual-reality video features are obtained; the features are extracted by means of the convolutional neural networks; and local scores areobtained by means of a support vector machine, and a final score is obtained by adopting a score fusion strategy. According to the full-reference virtual-reality video quality evaluation method, theaccuracy rate of an objective evaluation method is increased.

This invention discloses a high-efficiency liquid phase chromatography detection method for PDE-5 inhibitor in Chinese patent drug, health food and food. Diode array detector is adopted, and octadecylsilane chemically bonded silica is used as liquid phase chromatographic column of filling agent; the mobile phase is phosphoric acid triethylamine solution-methanol-acetonitrile system; the flow rate is 0.5 to 1.5 ml/min; the column temperature is 20 to 50 degrees centigrade; the pre-process of the sample uses acetonitrile or methanol for ultrasonic extraction; the sample is analyzed in the wavelength range from 200 mm to 400 mm. This invention has simple pre-process method, high accuracy, good specificity, short analysis cycle and wide detection concentration range; one analysis can detect eleven kinds of PDE-5 inhibitors; the invention is applied to qualitatively and quantitatively analyze PDE-5 inhibitor in Chinese patent drug, health food and food, which can greatly improve detection efficiency, save detection cost and meet the daily monitoring and detecting requirement.

The invention discloses a preparation method of sucrose ester, which belongs to the technical field of non-ionic surfactants. The method comprises the following steps of: removing a small amount of water and free fatty acids out of fatty acid methyl ester at first, and then adding a solid catalyst in the water-removed fatty acid methyl ester, mixing uniformly and adding sucrose in a certain ratio. In the existing industrial preparation of sucrose ester, an alkali metal hydroxide is commonly used as a catalyst, and subsequent product purification steps are cumbersome, and lots of wastewater is generated; however, according to the preparation method disclosed by the invention, a common industrial alkaline earth metal oxide is used as the solid catalyst, the reaction conditions are moderate, and the solid catalyst is not left in the product, can be repeatedly utilized and is environment-friendly and thus cost is reduced.

The invention relates to a method for analyzing soluble organic pollutants in indoor air, in particular to a method for analyzing varieties and contents of organic pollutants in condensation water by measuring and collecting condensation water in indoor air so as to reflect the quality of indoor air. Since the concentration of the organic pollutants in the collected condensation water is lower, a solid phase extraction technology is utilized to enrich the organic pollutants in water, so as to carry out qualitative and quantitative analysis by the aid of a gas chromatograph/velocitron and a high performance liquid chromatograph. The invention has the advantages of simple sampling method, high sample analysis speed, low cost for sample pretreatment, low detection limit and high sensitivity, and can qualitatively and quantitatively detect trace amounts of volatile organic pollutants and soluble organic substances in air. The analysis method is quick, sensitive and accurate, and is especially suitable for relatively closed environments, such as office buildings, engine rooms and the like.

The invention relates to a virtual reality video quality evaluation method based on a double-flow convolutional neural network, which comprises the steps of video preprocessing, wherein a VR differential video is obtained through a left view video and a right view video of a VR video, spatial compression is carried out on video frames at different positions, the frames are uniformly extracted fromthe compressed differential video, each frame is cut into blocks in a non-overlapped manner, a VR video patch is formed by the video blocks at the same position of each frame, so that enough data canbe generated for training the convolutional neural network, and meanwhile, optical flow is extracted for each VR video; establishing two convolutional neural network models with the same configuration; respectively taking the VR video patch and the optical flow as input; and obtaining a final objective evaluation score, wherein the scores obtained by two passages of the video patch and the lightflow are averaged and summed, so that a final objective quality evaluation score is obtained. According to the method, the accuracy of the objective evaluation method is improved.

The invention provides a cadmium ion detection kit as well as a preparation method and an application thereof. Complete antigen of a cadmium ion is a complex of the cadmium ion, a chelating agent andcarrier protein, wherein the chelating agent comprises any one of or a combination of any two of EDTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriamine pentaacetic acid), a derivative of DTPA, DOTA (1,4,7,10-tetraazacyclododecane-N,N,N,N-tetraacetic acid) and DOTA-NHS (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid-N-hydroxysuccinimide eater). The heavy metal cadmium ion is coupled with the carrier protein through a bifunctional chelating agent, the complete antigen of the cadmium ion is obtained, a cadmium ion monoclonal antibody with high immunogenicity and high valence for the cadmium ion is prepared, and the formed kit has high specificity and sensitivity and can be used for detecting the cadmium ion.

The invention provides a food allergen specific IgE detection kit and an application thereof. The kit includes magnetic micro-particles, a food allergen, an enzyme labeled anti human IgE antibody anda substrate, wherein the food allergen is modified with biotin, and the enzyme labeled anti human IgE antibody is modified with alkaline phosphatase. All the reagent components in the kit have good stability, and the kit has the advantages of long validity period, high sensitivity, good accuracy and short detection time.

The invention discloses a method for detecting a phthalic acid ester plasticizer in plastics. The method comprises the following steps: mass spectrometric detection is performed on the pre-treated plastics, wherein, the mass spectrometric detection condition comprises: an ionization mode: direct sampling-atmospheric pressure chemical ionization; a sampling mode: liquid sampling or direct solid sampling; when the sampling mode is the liquid sampling, the pretreatment is characterized in that the plastics are dissolved in an organic solvent, wherein, the organic solvent is one or more of tetrahydrofuran, cyclohexanone and dichloroethane; when the sampling mode is the direct solid sampling, the particle size of the plastics is less than 1mm. The method can simultaneously detect four phthalic acid ester plasticizers in a quantitative mode, in the detection method, a sample pretreatment method is simple, detection time is short within 0.2 minutes, speed is fast, sensitivity is high, and resolution rate is high.

The invention belongs to the technical field of treatment of solid wastes and particularly relates to a new technology for improving dissolving out of organic matter in excess sludge through pretreatment with an ultrasonic and free ammonia combined technology. The method comprises specific steps as follows: the excess sludge in a secondary sedimentation tank of a sludge treatment plant serves as afermentation substrate after gravity settling, a proper volume of sludge is subjected to ultrasonic treatment, a certain ammonia chloride solution is added to the sludge after ultrasonic treatment, pH and the temperature are controlled, free ammonia with certain concentration is produced, and the free ammonia is further pretreated. Experiments prove that dissolving out of organic matter in excesssludge can be further improved by means of the method, and the method has great significance in reduction and recycling of sludge.

The invention discloses a pretreatment method and a detection method of amoxicillin, penicillin G and penicillin V. The pretreatment method comprises the following steps that 1, a mixture of a sample to be detected and acetonitrile is centrifuged to collect supernatant, and the sample to be detected is a milk product which does not contain solid particles; 2, the supernatant is loaded to an activated Oasis PRiME HLB solid-phase extraction column, and effluent is collected. The pretreatment method is fast, simple, economical, reliable, capable of effectively extracting components to be detected and removing the influence of a complex matrix, and beneficial for fast detecting the sample to be detected. While the high extraction rate is kept, less organic solvent is used and discharged, loss of the organic solvent is reduced, environment is protected easily, the pretreatment steps are reduced, time is saved, energy consumption is reduced, and the detection method is fast, simple and high in precision and accuracy, and has high application value.

The invention discloses a lignin pretreatment method for preparing carbon fibers, comprising the following steps: (1) degrading the lignin with biological enzymes; (2) adding alkali to the degraded lignin for reaction, After the reaction is completed, an oxidizing agent is added for oxidation treatment; (3) Organic acid is added to the oxidized lignin for polymerization reaction, and the pretreated lignin is obtained after the reaction is completed; Methods The lignin molecular chain was adjusted so that the structural units in the lignin were arranged in an orderly manner, with less branched chains on the molecular chain and a stable structure, which had a positive effect on improving the mechanical properties, chemical stability and processability of carbon fibers.

The invention discloses a method for detecting tyrosine by using a chitosan-functionalized gold nano-modified glassy carbon electrode. The method comprises the following steps of (1) preparing a mixed liquid A, mixing the mixed liquid and a chitosan solution with the mass fraction of 0.5wt% at the volume ratio of 1:1, carrying out ultrasonic treatment, carrying out centrifugal treatment, taking sediments, dispersing the sediments into water at the mass-volume ratio of (5-8mg):1ml, carrying out ultrasonic treatment to obtain a micro-solution, titrating the micro-solution on the surface of the glassy carbon electrode and airing to obtain the chitosan-functionalized gold nano-modified glassy carbon electrode; and (2) adopting the chitosan-functionalized gold nano-modified glassy carbon electrode prepared from the step (1) as a working electrode, and detecting the concentration of tyrosine in a to-be-detected solution by using a differential pulse voltammetry of a three-electrode system according to a differential pulse voltammetry curve of the tyrosine. The method has the advantages of being simple in operation, fast in detection and high in sensitivity, and high-sensitivity recognition of the tyrosine in the mixed sample solution can be carried out.

The invention provides a method for determining the concentration of hydrochlorothiazide, losartan and active hydroxy acid metabolite 5-carboxylic acid losartan in plasma by liquid chromatography-massspectrometry. The method comprises the following steps of: (1) pretreating a plasma sample; (2) detecting by liquid chromatography-mass spectrometry; (3) preparing a standard curve; and (4) determining the concentration of hydrochlorothiazide, losartan and active hydroxy acid metabolite 5-carboxylic acid losartan in plasma. The method provided by the invention is rapid, accurate, high in sensitivity and simple to operate, and serves clinical application of medicines.