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4176results about How to "Solve the blockage" patented technology

Method for automatic correction and tiled display of plug-and-play large screen projections

The invention discloses a method for automatic correction and tiled display of plug-and-play large screen projections. The method comprises the steps as follows: adaptively generating a checker pattern with a certain resolution ratio, projecting by projectors in sequence, capturing by cameras, carrying out feature detection and identification on complicated projection surfaces or checkers under the illumination condition with a multi-feature detection method based on color and geometry, and creating a Bezier curve function to represent a corresponding relation of points between projector images and camera images; and obtaining effective display areas for screen projection with a quick approach method, determining a corresponding relation of the projection contents of the projectors and the display areas, carrying out geometrical distortion on the images to be projected for geometrical correction, and calculating weight values of pixels in projection overlapping areas with a distance-based nonlinear weight value distribution method for fusion of edge brightness. According to the invention, a plurality of projection images of irregular surfaces can be aligned and seamlessly spliced, and the whole method is simple and easy to use, higher in autonomy and better in seamless splicing performance.
Owner:OCEAN UNIV OF CHINA

Accompanying robot path planning method and system based on obstacle virtual expansion

The invention discloses an accompanying robot path planning method and system based on obstacle virtual expansion. The method includes a step of constructing an environment map, namely a step of constructing a two-dimensional occupancy grid map according to an actual scene, with each grid being labeled as an obstacle zone or a walkable zone; a step of setting initial coordinate positions of an accompanying robot and a movable target in the grid map; a step of constructing a sliding window for the robot; a step of subjecting the obstacle zones to expansion processing, namely a step of performing initial expansion on grids where an obstacle is according to a shortest distance between the center of the robot and a body edge, determining the number of grid layers expanded on the basis of the minimum impassable zone, adopting the grids in the expanded zones as obstacle virtual expansion grids, and labeling the grade of danger of obstacle influences on the obstacle virtual expansion grids; and a step of planning a path for the accompanying robot based on an A* algorithm and an incremental path planning process. Incremental path updating is performed by adopting a path of the last moment,thus saving path planning time and increasing the response speed of the accompanying robot.
Owner:QILU UNIV OF TECH

Production method of ultra low carbon steel

InactiveCN102719600AReduce the rate of oxygen blowing heating upReduce temperature dropManufacturing convertersSlagNitrogen
The invention provides a production method of an ultra low carbon steel. The method comprises the steps of: employing a blowing process for desulfurization and slag removal of molten iron, with control of oxygen blowing time and smelting cycle of a converter, argon bottom-blowing in the whole course, and control of S content in slag lime, [C] content at converter end point, and temperature and oxygen activity at the endpoint, adding lime in a tapping process, and modifying ladle top slag after tapping; employing natural decarburization to control carbon content in an RH, wherein Als in molten steel is less than 0.03% after deoxidation, carrying out vacuum-breaking, adding aluminum powder and top slag modifier into the top slag, blowing argon with stirring, vacuumizing again, and carrying out clean circulation for 2-10 min; and carrying out continuous casting with protective casting in the whole course, wherein a nitrogen increase amount in the molten steel is controlled at less than 2 ppm. The invention can effectively reduce temperature drop in a transmission process, reduce oxygen blowing heating rate in a subsequent RH refining treatment, save energy and shorten the time of refining. Besides, the method can effectively guarantee modification effect of the top slag, prevent nozzle clogging and realize sequence casting. Therefore, the method is particularly applicable to the production of high purity ultra low carbon steel.
Owner:ANGANG STEEL CO LTD

Method for producing ultra-low-carbon steel

A method for producing ultra-low-carbon steel belongs to steel-making technology field. The process route is: molten iron desulfuration preprocess -converter smelting -RH vacuum process -slab continuous casting. The iron desulfuration preprocess applies blowing magnesium granules for desulfuration; the converter smelting terminal carbon content and oxygen activity of molten steel; applying slag dam operation when tapping without deoxidation; the ladle furnace proceeds operation of top slag modification and temperature controlling; RH vacuum processing to control the maximum vacuum; applying Al for deoxidation when the decarburization is finished, and alloying if the deoxidation is finished and assuring the deep vacuum processing time after the deoxidation; calming the molten steel when the vacuum is finished; applying non-carbon covering agent and non-carbon protection slag in the slab casting process; the continuous casting process uses full protection casting, and the casting process controls a reasonable pulling speed according to slab section. The advantages are: the invention resolves problem of nozzle clogging and improves castability of the ultra-low-carbon steel and implements multi-furnace continuous casting, and the components of carbon, phosphorus, sulphur and nitrogen of the completed product conforms smelting request of the ultra-low-carbon steel.
Owner:SHOUGANG CORPORATION

Dark channel prior image dehazing method based on multiscale fusion

ActiveCN103942758ASuppress false edgesTransmittance images are accurateImage enhancementTransmittanceSky brightness
The invention discloses a dark channel prior image dehazing method based on multiscale fusion. The dark channel prior image dehazing method based on multiscale fusion comprises the steps that (1) minimum value filter is conducted on a fog-degraded image through a color channel with a neighborhood size of 1*1 and a color channel with a neighborhood size of 15*15, so that corresponding dark channel images are obtained, and an estimated point transmissivity graph and an estimated block transmissivity graph are calculated based on the dark channel images; (2) edge image smoothness protection based on L0 gradient minimization is conducted on the estimated point transmissivity graph; (3) large-size Gaussian filter is conducted on the estimated block transmissivity graph; (4) with a normalized gradient magnitude as the weight, the estimated point transmissivity graph and the estimated block transmissivity graph are fused to enable a corrected transmissivity graph to be obtained; (5) the lower bound of the transmissivity is estimated based on median filtering; (6) the sky brightness is estimated by means of a 15*15 dark channel image; (7) inverse solution is conducted on a fog-degraded model, and a dehazing result is output. The dark channel prior image dehazing method based on multiscale fusion has the advantages that the dehazing capacity is high, the complexity is low, the image dehazing quality and the image dehazing efficiency can be improved.
Owner:NAT UNIV OF DEFENSE TECH

Device and method for indirect thermal desorption disposal of persistent organic pollutant contaminated soil

The invention discloses a device and a method for indirect thermal desorption disposal of persistent organic pollutant contaminated soil. The device comprises a contaminated soil pretreatment system, a feeding system, a thermal desorption system, a discharging system, a tail gas purification system and an automatic control system, wherein the contaminated soil pretreatment system is connected with a feed opening of the thermal desorption system through the feeding system, a solid discharge opening of the thermal desorption system is connected with the discharging system, and a gas discharge opening of the thermal desorption system is connected with an inlet of the tail gas purification system. According to the method, after pretreatment, contaminated soil is conveyed to the thermal desorption system for desorption for 10-40 min at the temperature of 400-600 DEG C, and desorption exhaust gas adopts a technology including procedures of cyclone dust removal, two stages of spraying, drying and activated carbon adsorption / gliding arc degradation. The device and the method adopt indirect heating, so that risks of generation of poisonous materials such as dioxine and the like are avoided effectively; and a double-layer cylinder rotary kiln type furnace body, the furnace body axis and the ground form a 0-degree angle, and accordingly, the operation and maintenance costs are reduced.
Owner:中节能大地(杭州)环境修复有限公司

Method for upgrading coal pyrolysis

The invention provides a method for upgrading coal pyrolysis, comprising the following steps: (a) sending raw coal with granularity being less than and equal to 30mm into a rotary drier, so that the raw coal and hot flue gas are connected with each other by the means of parallel flow and directly change heat, and the raw coal exchanges heat indirectly with hot semicoke from a pyrolyzer in the rotary drier, to dry the raw coal; (b) mixing the dried raw coal with the high-temperature semicoke from a heating rotary kiln and sending the mixture into the pyrolyzer, wherein the coal material directly changes heat with the high-temperature semicoke and pyrolyzes to generate hot semicoke, tar steam and coal gas, wherein final pyrolyzing temperature is 500 DEG C-700 DEG C; and (c) sending a part of the hot semicoke generated into the heating rotary kiln for processing by means of heating, and sending the rest part of the hot semicoke into the rotary drier for exchanging heat directly with the raw coal. The method for upgrading coal pyrolysis has flexible operation, wide granularity range of the coal material, good quality of the generated semicoke and the generated tar, high cascade utilization of energy and high system thermal efficiency, properly solving the technical problems such as dust and tar blocking, high dust content in the tar, etc.
Owner:CHNA ENERGY INVESTMENT CORP LTD +1

Steam stripping method of process condensate in CO conversion

The invention relates to a steam stripping method of process condensate in CO conversion. The invention is characterized in that the process condensate firstly enters the upper part of a carbon dioxide steam stripping tower for flashing evaporation; secondary steam from the upper part of an ammonia-evaporated steam stripper tower enters the bottom part of the carbon dioxide steam stripping tower and steam strips carbon dioxide by countercurrent contacting with the process condensate after flashing evaporation; the process condensate after flash evaporation and the steam stripped carbon dioxide carry out countercurrent contact; the process condensate after flash evaporation and steam stripping enters the upper part of the ammonia-evaporated steam stripper tower from the bottom part of the carbon dioxide steam stripping tower and is steam-stripped by low-pressure steam entering from a kettle of the ammonia-evaporated steam stripper tower; gas phase is treated by secondary condensation to obtain non-acid-coagulated gas and condensate sewage; and steam stripping water is obtained from the bottom part of the ammonia-evaporated steam stripper tower. The invention carries out steam stripping on the upper and lower towers to carbon dioxide and ammonia in the process condensate respectively, thus avoiding the possibility of coexistence of carbon dioxide and ammonia in a condensing system, effectively solving the problem that the steam stripping system of the process condensate in the conversion procedure occurs ammonium salt crystallization blockage and prolonging the period of stable operation of a conversion device.
Owner:CHINA PETROCHEMICAL CORP +2
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