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110results about How to "Reduce extraction efficiency" patented technology

Method for extracting single tree information from LiDAR point cloud in layered clustering mode

The invention discloses a method for extracting single tree information from LiDAR in a layered clustering mode and belongs to the scope of LiDAR point cloud data processing and information extraction. According to the key technical point, 1, the point cloud is horizontally layered; 2, all the layers of point cloud are classified in a k mean value clustering mode, and different attribute values are provided for all the layers of point cloud; 3, the point cloud meeting preset conditions is fused; 4, the single tree positions, the tree height, the crown breadth and other information are extracted from the point cloud with the same attribute values, and forest stand structure information is calculated through the single tree information. The method has the key advantages that extraction of floor stratum single trees is achieved, and the number of accurately extracted forest stand forests reaches 80% or above; the function of extracting the single tree information from LiDAR and calculating the forest stand structure is achieved; no excessive requirement on the point cloud density is generated, and it is proved that the point cloud of 2p/m<2> can complete relevant work. The method can be applied to the field of LiDAR inversion information, is especially suitable for the forest stand condition with the complex structure, and can accurately extract the single tree positions, the tree height, the crown breadth, the forest stand structure parameters and other relevant information.
Owner:BEIJING FORESTRY UNIVERSITY

Method for extracting digital video fingerprints

The invention discloses a method for extracting digital video fingerprints. The method comprises the following steps of: extracting video slices of vision perception characteristics of a video fragment sequence, analyzing frequency domain characteristics of the video slices, processing the video slices by effectively using time-space relativity among the video contents and using 2-dimensional discrete wavelet transform (2D-DWT), and extracting horizontal detail component coefficients or vertical detail component coefficients in the 2D-DWT to serve as fingerprint information. The horizontal detail component coefficients or the vertical detail component coefficients reflect the stimulation of video content change on vision perception rather than low-level characteristics, such as color or gray, of a video frame at a certain moment, so that the method has good robustness for different video formats and different video contents. Meanwhile, the video slices are uniformly distributed in the whole video fragment, reflect the content change of the whole video fragment and have sensitivity, so that the method can meet requirements on video content identification and monitoring and precaution to various attacks. Meanwhile, by using the method, the size of the fingerprints is greatly reduced, and the efficiency of fingerprint extraction is improved. Therefore, the performance of the method is superior to that of the conventional digital video fingerprint extraction method.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Extraction method for mangrove plant kandelia candel leaf total protein suitable for two-dimensional electrophoresis

The invention discloses an extraction method for mangrove plant kandelia candel leaf total protein suitable for two-dimensional electrophoresis. A traditional trichloroacetic acid/acetone precipitation method for protein extraction and a traditional phenol extraction method for protein extraction are combined, a cosolvent SDS solution is introduced, the extraction process is optimized, and the Phe-B method suitable for extraction of the mangrove plant kandelia candel leaf total protein is established. The extraction efficiency and quality of the protein are effectively improved, and the technical scheme can be specifically suitable for extraction of the kandelia candel leaf protein in two-dimensional electrophoresis. The method has the advantages of being easy to operate, high in protein extraction efficiency and fewer in interfering substance, and is suitable for materials with difficult protein extraction, low protein extraction efficiency and more interfering substances. The extracted kandelia candel leaf protein completely meets the requirements of the first direction and the second direction of two-dimensional electrophoresis, a high-quality two-dimensional electrophoresis gel map with high resolution, more clear protein points, uniform distribution and the clear background can be obtained, and experiment repeatability and stability are good.
Owner:SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI

Method for separation purification of polyhydroxy-alkyl-pyrazine from suger amine reaction liquid

This invention discloses a method of separately purifying caoboxyl alkyl pyrazine from sugar ammonium reaction liquor. Compound got by reaction of sugar and ammonia is pressed let in acceptable filtration membrane (retention molecular weight is more than 200) or exceed filtration membrane (retention molecular weight is more than 1000) from material storage tank. Macromolecule matter is entrapped by membrane module, parts feed liquids penetrate the two membranes (there is multi-caoboxyl alkyl pyrazine, and macromolecule matter content is low or absence because of entrapped by membrane module), the material liquid that don't penetrate the membrane module is sent back to material storage tank through tubes and then sent to membrane modules to be separated. Pure water can be added to material storage tank for dilution at the later stage of separation, then acceptable filtration or exceed filtration is kept on to make the multi-caoboxyl alkyl pyrazine penetrate the module along with the penetration liquid at the best. All penetration liquids are collected and pure multi-caoboxyl alkyl pyrazine category matter can be got after concentration, extraction, decoloration, crystallization or using chromatogram etc. technologies. It can be used as spice or medicine materials. The material liquid can be directly used to perfuming and charging of cigarette to improve taste of cigarette and other aspects.
Owner:CHINA TOBACCO HUNAN INDAL CORP

Extracting method of 2'-hydroxy-4'-methoxyacetopheone

The invention provides an extracting method of 2'-hydroxy-4'-methoxyacetopheone.The method comprises the steps that a water steam distillation and alkali-dissolution and acid-precipitation combined method is adopted to extract 2'-hydroxy-4'-methoxyacetopheone, moutan bark and whole plants of paniculate swallowwort or paniculate swallowwort roots serve as the raw materials, the raw materials are smashed and subjected to water extraction for 10 h-23 h, water steam distillation is conducted, and distillation is stopped when the mass of distillate is 2.5-3 times that of the raw materials; the distillate is cooled and filtered, a product A is obtained, the pH of the raw material and residual liquid in a flask after water steam distillation is conducted is adjusted to be 12-14, and alkali dissolution is conducted; the pH of the solution is adjusted to be 5-7 after alkali dissolution is conducted, acid precipitation is conducted, cooling and filtering are conducted, and a product B is obtained.The method can efficiently extract 2'-hydroxy-4'-methoxyacetopheone, the extraction rate reaches up to 95.3%, and the purity of obtained 2'-hydroxy-4'-methoxyacetopheone reaches up to 98.8%; according to the method, no organic solvent is adopted, environmental pollution is avoided, and environmental friendliness is better achieved.
Owner:CHONGQING UNIV

Smoke gas extraction system applied to ammonia escape detection and smoke gas extraction method

The invention provides a smoke gas extraction system applied to ammonia escape detection and a smoke gas extraction method. The smoke gas extraction system comprises a smoke gas sampling device, an extraction power device and an anti-blocking device, wherein the smoke gas sampling device comprises a plurality of extraction heads in equal-area matrix distribution in the flue cross sections; the plurality of extraction heads are communicated with a mixed gas mother tank through sampling pipelines; the sampling pipelines are communicated with the mixed gas mother tank and the anti-blocking devicein parallel; a valve is arranged on each sampling pipeline; the extraction power device is connected with the mixed gas mother tank. The ammonia and NOx quantity at an SCR reactor outlet can be accurately detected; the ammonia spraying is realized according to the mole ratio of ammonia to NOx; the excessive ammonia spraying is avoided, so that the ammonium salt crystallization is reduced; the problem of air preheater blockage is solved. A large amount of cleaning and maintenance cost is reduced. The ammonium salt crystallization formation at the catalyst surface and nearby part is avoided; the service life of the catalyst is prolonged. The blockage damage of the whole system can be prevented through the anti-blocking device; the operation reliability and the service life of once commissioning are ensured.
Owner:陕西凯特自动化工程有限公司

Low-cost and high-extraction efficiency extraction method of peony flower stock solution

The invention belongs to the technical field of peony processing, and particularly relates to a low-cost and high-extraction efficiency extraction method for a peony flower stock solution. The extraction method comprises the following steps: harvesting peony petals; carrying out cryopreservation on the petals; carrying out enzyme deactivation and sterilization treatment; squeezing and standing, and taking the upper-layer liquid to obtain a peony petal stock solution first crude liquid; sterilizing and decoloring; and filtering, and filtering for the second time to obtain the peony flower stocksolution. According to the invention, the peony flower stock solution prepared by the method disclosed by the invention is strong in free radical resistance, does not pollute the environment to the greatest extent, and is most energy-saving; compared with other processes such as distillation, supercritical carbon dioxide, subcritical, biological fermentation and other disclosed production processes, the product provided by the invention has strong oxidation resistance and stability; and raw material resources are fully utilized, the process is simple and convenient, economic benefits are high, investment cost is low, residues are low, no waste water or waste gas is generated, and efficient industrialization is achieved.
Owner:天宝牡丹生物科技有限公司

Method of extracting non-alkaloid from fructus meliae toosendan and rhizoma corydalis

The invention discloses a method of extracting non-alkaloid from fructus meliae toosendan and rhizoma corydalis, relates to an extraction method of the non-alkaloid and aims at solving the technical problems of the traditional method of extracting the non-alkaloid of low speed, high cost, need for reflux high temperature, complex operation, high cost of extraction process and low extraction efficiency. The method comprises the following steps: mixing the rhizoma corydalis and the fructus meliae toosendan, grinding, adding an ethanol aqueous solution, and carrying out ultrasonic treatment and microwave heating; then carrying out ultrasonic treatment, filtering, collecting a filtrate, steaming out ethanol in the filtrate, adding water to regulate a pH value, and collecting an ion exchange liquid containing the non-alkaloid component; and regulating a pH value to be 7, carrying out vacuum concentration, and drying under vacuum to prepare non-alkaloid powder. Compared with the decocting and alcohol precipitation processes, the method has the following characteristics of rapidness in extraction, high extraction rate, low cost, high efficiency, no need for reflux high temperature, simpleness and feasibility in operation, low cost of the extraction process and remarkable comprehensive economical benefit. The invention belongs to the field of extracting the non-alkaloid.
Owner:HEILONGJIANG UNIV OF CHINESE MEDICINE
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