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277results about How to "Improve extraction speed" patented technology

Improved closed-loop detection algorithm-based mobile robot vision SLAM (Simultaneous Location and Mapping) method

The present invention provides an improved closed-loop detection algorithm-based mobile robot vision SLAM (Simultaneous Location and Mapping) method. The method includes the following steps that: S1,Kinect is calibrated through a using the Zhang Dingyou calibration method; S2, ORB feature extraction is performed on acquired RGB images, and feature matching is performed by using the FLANN (Fast Library for Approximate Nearest network); S3, mismatches are deleted, the space coordinates of matching points are obtained, and inter-frame pose transformation (R, t) is estimated through adopting thePnP algorithm; S4, structureless iterative optimization is performed on the pose transformation solved by the PnP; and S5, the image frames are preprocessed, the images are described by using the bagof visual words, and an improved similarity score matching method is used to perform image matching so as to obtain closed-loop candidates, and correct closed-loops are selected; and S6, an image optimization method centering cluster adjustment is used to optimize poses and road signs, and more accurate camera poses and road signs are obtained through continuous iterative optimization. With the method of the invention adopted, more accurate pose estimations and better three-dimensional reconstruction effects under indoor environments can be obtained.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction

The invention provides a method for extracting coal bed gas by negative pressure on the ground through gas-coal simultaneous extraction aiming at a waterless coal bed in an ore field. The extraction of the coal bed gas sequentially comprising three stages, namely pre-extraction before coal mining, extraction during coal mining, and extraction after coal mining; and in the method, in the well drilling process, nonmetal sleeves are descended into an old top section and a coal bed section of a vertical well, steel sleeves are descended in other layers, the nonmetal sleeves arranged in the coal bed section avoid hidden danger of sparkles caused by collision of a coal cutter and metal sleeves in subsequent coal mining, and the nonmetal sleeves arranged in the old top section reserve channels for extraction in a worked out section after the rock and shaft below the old top section are collapsed. In the method for extracting the coal bed gas, one well has three purposes, namely gas is pre-extracted in the coal bed section before coal mining, air return and exhaust are performed in the coal mining process and gas in the worked out section is extracted by negative pressure after coal mining, and the utilization rate of a coal bed gas well is improved; and the gas-coal simultaneous extraction is realized, the safety production of a coal mine is ensured, and multi-win effects of efficiently extracting the coal bed gas, utilizing new energy, protecting environment and the like are achieved.
Owner:中矿瑞杰(北京)科技有限公司

V2X-based roadside unit system and information distribution method thereof

The invention provides a V2X-based roadside unit system and an information distribution method thereof. The system mainly comprises a communication network management module, a message proxy module, an information security component module, a log management component module, a message bus interface module and the like. An RSU (roadside unit) message proxy module is responsible for parsing, priority scheduling and distribution of messages, sent by an application layer through a message bus interface, to a message bus. The RSU communication network management module is responsible for shieldingprotocol difference of a platform and RSU auxiliary communication equipment, and a unified communication calling interface is provided for middleware message proxy. According to the system and the method in the invention, heterogeneous network multi-source information from a road sensor, a vehicle, a cloud platform, a differential positioning base station and the like is managed through the V2X RSU in a unified way, a unified communication calling interface is provided for an upper-layer application, and the application development efficiency and the function expandability are improved; the messages are scheduled on the basis of a priority policy so as to ensure that the information with relatively high information tightness is preferentially sent.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Antibacterial cotton textile fiber preparation method

The invention discloses an antibacterial cotton textile fiber preparation method, which is characterized by comprising: immersing 5 g of a fabric in a caustic soda solution with a mass fraction of 5-30% for 15-60 min at a temperature of 20-35 DEG C, taking out the fabric, placing into 100 g of a chloroacetic acid aqueous solution with a mass concentration of 10%, taking out after 30-45 min, sealing the fabric in a polyethylene plastic bag, placing in a 30-80 DEG C oven, carrying out a reaction for 1-3 h, washing 3-5 times with 50 ml of an ethanol and water mixing solution with a volume ratio of 80:20, drying, dispersing 0.6 g of sodium alginate, 0.7 g of chitosan and 2.2 g of a coptis chinensis extract in 10 g of distilled water, carrying out mixing stirring for 15 min at a temperature of 30 DEG C to obtain the chitosan solution of microcapsule, immersing the modified cotton textile fiber in the chitosan solution of the microcapsule for 30-45 min, taking out, immersing 6 g of a modified starch cross-linking agent, carrying out a reaction for 0.5-1.5 h, adding 0.3 g of a material C, carrying out a reaction for 1 h at a temperature of 90 DEG C, drying for 5-15 min at a temperature of 150 DEG C, carrying out water washing 3-5 times, and drying so as to obtain the antibacterial textile. The prepared textile of the present invention has the lasting antibacterial effect.
Owner:安徽富颍纺织科技股份有限公司

Method for extracting key phrases based on lexical chain

The invention discloses a method for extracting key phrases based on a lexical chain, relating to a method for extracting the key phrases and aiming at solving the problems that the traditional method for extracting key words cannot exactly reflect subject information described by articles and the traditional method for extracting the key phrases based on the lexical chain has lower accuracy for extracting the key phrases and lower coverage for subject information of documents. The method comprises the following steps of: firstly, acquiring word meanings; secondly, eliminating the ambiguity of words by using a dictionary 'Hownet'; thirdly, constructing the words eliminating the ambiguity into the lexical chain and acquiring a plurality of strong chains; fourthly, selecting center words from the strong chains to form a center word set; and fifthly, calculating the concurrence rate among different center words in the center word set and selecting the center words the concurrent rate of which is greater than the extraction threshold set by a user as key phrases. By using the invention, the subject information of the documents can be effectively reflected, the accuracy for extracting the key phrases can be improved and the subject information of the documents can be effectively covered by fewer key phrases. The invention is applied to the filed of key word extraction.
Owner:HARBIN INST OF TECH

Unbalance excitation force compensation method of LMS adaptive filtering bearingless motor

InactiveCN104660137AUnbalance vibration displacement overcomeUnbalance vibration displacement elimination or suppressionElectronic commutation motor controlVector control systemsAdaptive filterClosed loop feedback
The invention provides an unbalance excitation force compensation method of an LMS adaptive filtering bearingless motor. The method comprises the following steps: firstly, measuring the rotating mechanical angular velocity Omegar and the real-time radial displacement x(k) of a motor rotor, and constructing dual reference signals of an LMS filter according to the Omegar and the x(k); inputting the x(k) and the dual reference signals into the LMS filter, adjusting the weight of the filter by use of a weight adjustment algorithm containing a simple step length factor adjustment function, and extracting the optimal estimation value of an unbalance vibration displacement signal of the rotor; and performing rotor synchronous revolution transformation, closed-loop feedback and inverse rotor synchronous revolution transformation on the optimal estimation value in sequence, thereby obtaining an unbalance vibration compensation control force signal. The adaptive variable-step length factor adjustment function is capable of adjusting a critical tracking error absolute value between the adaptive fast adjustment stage and the slow adjustment stage of the step length factor by use of a parameter c. The unbalance excitation force compensation method is small in calculation amount, and capable of overcoming unbalance centrifugal excitation force generated due to the mass eccentricity of the rotor; as a result, the suspension control accuracy of the rotor and the unbalance displacement tracking extraction and convergence rates are increased.
Owner:HENAN UNIV OF SCI & TECH

Process for pumping and exploiting coal bed gas by together using ground well drilling and underground hole drilling

The invention relates to a coal bed gas exploiting technique, in particular to a process for pumping and exploiting coal bed gas by together using ground well drilling and underground hole drilling, solving the problem of low efficiency of the traditional method for pumping and exploiting the coal bed gas. The process comprises the following steps of: (1) carrying out well drilling on the ground; (2) carrying out long hole drilling in underground coal beds; (3) making drilled holes and ground drilled wells crosslink and communicate in the appointed points by utilizing an orientation technique of a long hole drilling machine; (4) effectively closing the underground long drilled holes; (5) fracturing the ground drilled wells and the underground long drilled holes by utilizing fracturing equipment on the ground; (6) after fracturing, closing the ground drilled wells; and (7) opening the closed ends of the underground long drilled holes and then installing relevant pumping and discharging pipelines connected with underground pumping and discharging systems. The process improves the pumping and exploiting speed and efficiency of the coal bed gas, shortens the construction period of coal bed gas pumping and exploiting engineering and saves the construction investment of the coal bed gas pumping and exploiting engineering.
Owner:山西蓝焰煤层气集团有限责任公司

Ginger detergent processed at ultrahigh pressure and preparation method thereof

The invention provides a ginger detergent processed under ultrahigh pressure and a preparation method thereof and belongs to the daily chemical application field. The ginger detergent processed under ultrahigh pressure is used for solving the problem of skin irritation caused by an antiseptic substance added in the existing detergent. The ginger detergent mainly comprises the following raw materials: sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, coco fatty acid diethanol amide, a chelating agent, a solubilizer and deionized water containing a ginger extract component. Due to the adoption of deionized water containing the ginger extract component, the ginger detergent has a good effect of removing fishlike smell, and as the ginger has a natural fragrance, no any perfume needs to be added in the raw materials; ultrahigh processing technology is carried out in the step of preparing the deionized water containing the ginger extract component and the step before bottling; as a result, the yield and extraction speed of the effective component can be increased obviously, and the utilization efficiency of ginger is improved. The ginger detergent is processed at ultrahigh pressure, so that the sterilization effect can be achieved and the use of the antiseptic substance is avoided.
Owner:SHANDONG UNIV OF SCI & TECH

Human face feature extraction and classification method

The invention relates to a human face feature extraction and classification method. The method includes the following steps that feature dimension reduction is performed on human face images through a 2D-PCA method, and a high-dimensional image matrix is converted into a low-dimensional image matrix; the low-dimensional image matrix is converted into one-dimensional column vectors; according to the one-dimensional vectors of images of a training set, an intra-class divergence matrix S<W> and an inter-class divergence matrix S in the training set are solved, and eigenvalue decomposition is performed on the S<W> and the S respectively, wherein the eigenvalue decomposition formulae are as follows: and ; D<alpha> is used for estimating , D<beta> is used for estimating , and the formulae and can be obtained; the column space W<1> of and the column space W<2> of are respectively solved, and the optimum projection space W=[W<1>,W<2>] of a feature extraction algorithm with two stages of LDA based on 2D-PCA is obtained; the low-dimensional image matrix in the first step is projected into the optimum projection space W, and then feature vectors of the images are obtained; classifier training is performed on the feature vectors obtained in the sixth step through an SVM+NDA model, and a final human face classifier is obtained.
Owner:ZHEJIANG UNIV

A superjunction IGBT with a shielded gate and a manufacturing method thereof

The invention discloses a superjunction IGBT with a shield gate and a manufacturing method thereof. The superjunction IGBT comprises a semiconductor substrate, a cell region and a terminal protectionarea. The semiconductor substrate comprises a second conductivity type collector region, a first conductivity type field termination layer and at least one first conductivity type epitaxial layer. Thecell region comprises a plurality of cells connected in parallel with each other, which includes a plurality of cell trenches and a gate conductive polysilicon and a shield gate filled in the cell trenches, A seventh oxide layer is arranged on both sides and sidewalls of the notch of the cell trench opposite to the gate conductive polysilicon, a fifth oxide layer is arranged between the gate conductive polysilicon and the shield gate, and a fourth oxide layer is arranged on the bottom and sidewalls of the cell trench opposite to the shield gate. A P-pillar is also provided in the first conductivity type epitaxial layer, one end of the P-pillar is connected to the second conductivity type well layer, and the other end extends toward the first conductivity type field termination layer. Theinvention adopts the shielding gate structure, reduces the Miller capacitance, thereby reducing the switching loss.
Owner:无锡市乾野微纳科技有限公司

Traditional Chinese medicine extracting and filtering device

The invention discloses a traditional Chinese medicine extracting and filtering device which comprises a reaction kettle and an inner container. The inner container is arranged in an inner cavity of the reaction kettle, a heating cavity is formed between the reaction kettle and the inner container, the top end of one side face of the heating cavity is penetratingly connected with an air incoming pipe, an air shift box is arranged at the top wall of an inner cavity of the inner container, a stirring rod is arranged in the inner cavity of the inner container, the top end of the stirring rod penetrates the top walls of the air shift box and the reaction kettle and is fixedly connected on a motor shaft of a motor, a plurality of stirring pipes are uniformly arranged on the stirring rod, the bottom end of the inner container is penetratingly connected with an agent discharging pipe, the other end of the agent discharging pipe penetrates the bottom wall of the reaction kettle and is penetratingly connected with a filter, and a plurality of supporting legs are arranged at the bottom end of the reaction kettle uniformly. By arranging the heating cavity to wrap the whole inner container to enable the outside of the same to be heated uniformly, lowering of quality of medicine liquid due to charring of traditional Chinese medicine caused by local overheating can be prevented effectively; the medicine liquid is heated from the inside of the same through the stirring rod and the stirring pipes, so that heating effect of the medicine liquid is further improved, and extraction speed and quality of traditional Chinese medicine are improved substantially.
Owner:贵港市鼎金电子产品有限公司

Enterprise internal auditing system based on block chain technology

The invention discloses an enterprise internal auditing system based on a block chain technology. The enterprise information processing system comprises an upper application layer, a development interface layer, a block chain platform layer, a data layer, an infrastructure layer and a terminal department, the upper application layer and the development interface layer are in bidirectional connection, and the open interface layer and the block chain platform layer are in bidirectional connection. The invention discloses an enterprise internal auditing system based on a block chain technology. Aplurality of auditing modes can be set. The actual requirements of enterprise departments are met. Actual services of different enterprises can be met. The standardization and the unification of audit services in an enterprise can also be completed. According to the method, the original data information can be obtained accurately, the efficiency and quality of obtaining audit evidences by internal audit of enterprises are improved, and the reliability of obtaining the evidences by the internal audit is effectively guaranteed, so that the efficiency and effect of executing audit work in the enterprises are improved, and the storage mode of the networked internal audit data is improved.
Owner:威海华智数字经济研究院有限公司

Preparation method for solid-phase micro-extraction fiber bundle

The invention relates to a preparation method for a solid-phase micro-extraction fiber bundle, and relates to preparation of the fiber bundle. The preparation method comprises the steps of (1) preparation of single SPME (solid-phase micro-extraction) fibers based on an integral material: mixing a monomer, a crosslinking agent, a pore-forming agent and an initiator to prepare a uniform solution, then injecting the uniform solution into a capillary which is 5-20cm long and of which the inner diameter is 0.2-0.8mm and the wall thickness is 0.05-0.2mm, sealing two ends of the capillary, performing polymerization, removing a section, which is 1-3cm long, of the capillary, putting the integral material fiber into a soxhlet extractor, performing extraction through a solvent, or putting the fiber into the solvent, and soaking the fiber until no impurity is detected from the liquid so as to obtain the single SPME fibers based on the integral material; (2) preparation of the solid-phase micro-extraction fiber bundle: combining 2-6 of the single SPME fibers based on the integral material on the capillary to obtain the solid-phase micro-extraction fiber bundle. The preparation method is simple, high in extraction capacity, high in extraction speed, low in cost and easy to operate.
Owner:XIAMEN UNIV

On-line detection method of contour accuracy of molding layer in laser selective melting process

The invention belongs to the technical field of additive manufacturing on-line measurement, and discloses an on-line detection method of the contour accuracy of a molding layer in the laser selectivemelting process. The on-line detection method includes the following steps that S1, a model of a to-be-machined part is sliced, and an auxiliary image is generated; S2, powder spreading is conduced, and then powder is melted and molded in a laser selective mode; S3, an image of a basic molding area is collected, and a contour of a segmented image is extracted; S4, the image contour is subjected tothree-dimensional reconstruction to obtain an image actual contour; S5, the image actual contour Cr is compared with a contour of a corresponding slicing layer to analyze the accuracy, if the requirements are met, the step S6 is executed, and otherwise, machining is completed; and S6, whether machining of the to-be-machined part is completed or not is detected. According to the on-line detectionmethod of the contour accuracy of the molding layer in the laser selective melting process, the range of image contour extraction can be effectively and accurately delimited, and then the number of iteration times in the calculation process is greatly decreased; and thus the extraction accuracy of the image contour reaches the sub-pixel level, and accurate and rapid contour detection is realized.
Owner:HUAZHONG UNIV OF SCI & TECH
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