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Rapid fingerprint identification method
InactiveCN101609499AAvoid panningAvoid dependencyCharacter and pattern recognitionFeature extractionFeature selection
The invention discloses a rapid fingerprint identification method based on image characteristics and minutia characteristics. The method comprises the following steps: firstly, detecting a reference point and determining a direction thereof, and determining the reference direction of the reference point by observing the difference between the fingerprint direction and the radial direction in sector regions with different sizes; carrying out image characteristic extraction, performing feature selection after normalization, and finally, obtaining the characteristic vector of the fingerprint image; establishing a minutia template and transforming the obtained minutiae under a polar coordinate system to establish a fingerprint minutia template; and carrying out the characteristic matching, i.e. as for the input fingerprints to be compared, judging whether the two fingerprints are matched or nor by using the fingerprint image characteristics and the minutia template obtained from the three steps. The invention not only can effectively inhibit the influence generated during the fingerprint image translation and the rotation, but also avoids the dependence to the detected reference point and the direction thereof in the recognition process and can also rapidly and accurately judge whether the fingerprint to be identified is matched with the template fingerprint or not.
Owner:NANJING UNIV OF SCI & TECH
Self-elevating scaffold provided with telescoping platforms for building construction
InactiveCN102926529ASimple structureLess material consumptionBuilding support scaffoldsWinding machineWire rope
The invention discloses a self-elevating scaffold provided with telescoping platforms for building construction. The self-elevating scaffold comprises a base which is fixed on the ground surface, an upright column which is fixedly arranged on the base, a platform base which is arranged on the upright column and can be lifted along the upright column, a connector, a lifting device and the two telescoping platforms which are arranged on two sides of the platform base and are lifted along the upright column together with the platform base, wherein the upright column is formed by connecting a plurality of upright column base frames in sequence; the lifting device comprises a steel wire rope and a winding machine; an outer guide rail is arranged on each of two sides of the upper surface of the platform base along the length direction; each telescoping platform comprises a bottom plate and an inner guide rail; and limit wheels which are used for limiting the sliding range of the inner guide rails are arranged at two ends in a guide groove along the length direction. The self-elevating scaffold provided with the telescoping platforms for the building construction has the advantages that security and convenience of construction are improved, the adjusting speed is high, the stability is high, and the like.
Owner:BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE +1
Display device, backlight module and frame unit
ActiveCN102679285AAvoid panningImprove stabilityLighting support devicesOptical light guidesDisplay deviceEngineering
The embodiment of the invention discloses a display device, a backlight module and a frame unit. The frame unit comprises a rubber frame and a back plate which are matched with each other. The back plate consists of a bottom and a first side wall which are integrated as a whole, the bottom is used for bearing an optical diaphragm of the backlight module; the rubber frame consists of a bearing part, a second wall and a supporting part which are integrated as a whole, the bearing part is used for being matched with the bottom so as to fix the optical diaphragm and for supporting a liquid crystal panel, a holding channel is formed between the second side wall and the supporting port, the first side wall is arranged in the holding channel, the supporting part consists of a supporting main body and a positioning block which are integrated as a whole, the supporting main body is connected with the bearing part, and the positioning block and the bottom are matched with each other so as to prevent the rubber frame from doing translation motion relative to the back plate. With the invention, the stability and firmness of the rubber frame can be effectively improved, the display property of the display device is stable, the condition of product damage does not occur easily, and the service life of the product can be further prolonged.
Owner:TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
Point cloud attribute encoding and decoding method, device and system based on DCT
ActiveCN111953998AAvoid panningRemove spatial redundancyDigital video signal modificationDiscrete cosine transformationTime complexity
The invention discloses a point cloud attribute encoding and decoding method, device and system based on DCT. The encoding method comprises the steps: acquiring point cloud data to be encoded; reordering the to-be-coded point cloud data, and selecting a plurality of points as to-be-transformed points; performing DCT (Discrete Cosine Transformation) on the attribute information of the to-be-transformed points to obtain a transformation coefficient; and quantizing and encoding the transformation coefficient to realize encoding of the point cloud attribute. According to the point cloud attributecoding method based on DCT, the coding time complexity is reduced, and meanwhile the coding performance is improved.
Owner:XIDIAN UNIV
Windshield wiper blade assembly with axial translation prevention system
A windshield wiper blade assembly is disclosed that includes a resilient wiper blade having an axial channel through which resilient support beams are positioned to form a structure. The universal connector element used to connect the blade assembly to several different wiper arms is bent along the wiper blade to the middle of the blade and support beam assembly in such a way that no perforation or perforation of the elastic windshield wiper material is required machining while simultaneously preventing relative axial translation of the support beam in the windshield wiper blade and translation between the blade and the connector itself.
Owner:TENNECO AUTOMOTIVE OPERATING CO INC
Lifting type water floating split green building structure system and construction method
InactiveCN105253261APromote sustainable developmentSave land resourcesFoundation engineeringFloating buildingsMarine engineeringEconomic benefits
The invention relates to a lifting type water floating split green building structure system and a construction method. The lifting type water floating split green building structure system comprises a water floating structure and an underwater support structure. The water floating structure is composed of an FRP reticulated shell dome, an FRP cantilever reticulated shell, FRP combination columns, an FRP sandwich concrete combination base plate, guy rope devices with active control dampers, FRP cylindrical surface reticulated shells, FRP inclined struts and an access pipeline gathering channel. The FRP reticulated shell dome is arranged on the boss of the FRP combination columns to form an enclosed roof structure, the lower end of the FRP cantilever reticulated shell is fixed on the bosses of the FRP combination columns, and the upper end of the FRP cantilever reticulated shell is connected with the FRP reticulated shell dome through pull bars driving the active control dampers; and the two ends of the FRP sandwich concrete combination base plate are provided with U-shaped swimming pools, the FRP inclined struts are arranged at the side surfaces of the swimming pools, and the underwater support structure can be composed of telescopic spring inflation piles and a raft plate base. The upper-portion structure of the system can be disengaged from the base, the floating effect of water is brought into full play, and the overall economic benefits are quite good.
Owner:NORTHEAST GASOLINEEUM UNIV
Pipe unloading and translation mechanism
InactiveCN108706285AImprove efficiencyQuality improvementConveyorsConveyor partsElectromagnetic clutchEngineering
The invention discloses a pipe unloading and translation mechanism, and belongs to the field of building material machining mechanical equipment. A reciprocating driving mechanism is vertically fixedon one side of the upper side of a fixed base; a connecting bracket is vertically fixed between the reciprocating driving mechanism and a pushing mechanism; an unloading mechanism is arranged on the upper side of the pushing mechanism; the connecting bracket is horizontally and rotationally connected with an electromagnetic clutch; one end of a one-way clutch on one side of a rotating gear is horizontally arranged in the electromagnetic clutch; a pushing rotating shaft above a pushing bracket is horizontally arranged in the electromagnetic clutch; a damping mechanism is arranged at one end ofthe pushing rotating shaft; pipe pushing support rods are symmetrically arranged on the outer side of a pushing chain; and an unloading mechanism comprises a pipe guide inclined plate, a pipe stop rotating rod, a lower pipe cylinder and a lower pipe baffle plate. The pipe unloading and translation mechanism is reasonable in structural design, can gradually and stably unload pipes, and can flatly shift the pipes as needed efficiently and accurately to meet the machining and use demands.
Owner:桐乡市川泰纺织科技有限公司
Swiveling mechanism and engineering machinery with swiveling mechanism
InactiveCN101532300ALow turning resistanceReduce use costSoil-shifting machines/dredgersBuilding material handlingMechanical engineeringEngineering
The invention discloses a swiveling mechanism and an engineering machinery with the swiveling mechanism. The swiveling mechanism includes a first component and a second component which can rotate reversely, the first component includes at least two roller columns, the roller column can be rotary installed on the first component body; the second component includes a center line and a ring shape curve surface coinciding with a swiveling shaft line of the swiveling mechanism, the ring shape curve surface cooperates with the roller column peripheral, preferably, a first face of the second component cooperates with a first face of the first component for forming a first cooperating surface. The roller column is rotary installed on a first component body, cooperation between the ring shape curve surface and the roller column peripheral belongs to rolling cooperation which can reduce swiveling resistance of the swiveling mechanism. Compared with the bearing type swiveling mechanism, the swiveling mechanism can reduce manufacturing and using cost. The invention provides the swiveling mechanism with little swiveling resistance, simple structure and strong maintenance from a new technique angle.
Owner:SANY HEAVY IND CO LTD (CN)
Protective cover for container and container provided with such a cover
ActiveCN101438092AAvoid panningVessel mounting detailsVessel geometry/arrangement/sizeInterface designEngineering
Protective cover for a container of fluid, particularly for a compressed-gas bottle, comprising a covering body (5, 6) and a ring (3) that forms an assembly interface designed to be placed between a container and the covering body (5, 6), said cover being characterized in that the ring (3) has an opening (13) around its circumference for positioning it on or removing it from a container.
Owner:LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
Rotolinear clamping cylinder
InactiveCN105339680AAvoid panningReduce manufacturing costAssembling battery machinesFinal product manufactureMechanical engineeringBase line
The invention relates to a clamping cylinder (100) comprising a body (110) and a movable assembly (102) contained in a receiving chamber (112) of the body, rotatable and translatable relative to the body along a predetermined movement axis (V), the cylinder comprising guide means (142; 150) in order to guide the movable assembly between a clamping position and a free position. The guide means comprise: - at least one cylindrical roller (150A-150D) arranged on the body of the cylinder such that the axis of the roller is essentially perpendicular to the movement axis (V), - a rod (104) of the movable assembly extending along the movement axis and being configured so as to comprise at least one movement portion (142) having a polygonal section in a plane normal to the movement axis, the section comprising at least one rectilinear edge, the movement portion (142) being configured such that said section follows an essentially helical base line around the movement axis over at least a fraction (143) of the portion, the rod (104) and the rollers (150A-150D) being positioned such that a roller is arranged across from each of the sides of the polygonal section.
Owner:BLUE SOLUTIONS
Ecological damaged revetment repairing structure
ActiveCN105887760AAvoid pollutionFast constructionCoastlines protectionReceptacle cultivationShip wavesEngineering
The invention discloses an ecological damaged revetment repairing structure. The ecological damaged revetment repairing structure comprises a pile foundation concrete structure, a placement platform, prefabricated cylinders and prefabricated wedge blocks. The prefabricated cylinders are vertically installed on the placement platform; concrete is poured between every two adjacent prefabricated cylinders in situ to achieve seamless connection; the prefabricated wedge blocks are fixed to the bottom between the every two adjacent prefabricated cylinders; the placement platform is arranged on the pile foundation concrete structure near the water side and a lower structure of an original revetment; and square piles are inserted and struck into the side near the water of the lower structure of the original revetment, and concrete is poured to form the pile foundation concrete structure. The ecological damaged revetment repairing structure can reduce the cost of a revetment repairing project, reduce carbon emission, improve the ecological feature of the revetment, achieve recycling of dismantled old materials, improve the construction progress and weaken the ship wave function.
Owner:SOUTHEAST UNIV
Split type on-water floating and energy-saving building structure system and construction method
InactiveCN105155581AFloating helpsPromote sustainable developmentArtificial islandsUnderwater structuresLine tubingMarine engineering
The invention relates to a split type on-water floating and energy-saving building structure system and a construction method. The split type on-water floating and energy-saving building structure system comprises an on-water floating structure and an underwater supporting structure. The on-water floating structure is composed of an FRP reticulated shell dome, an FRP overhung reticulated shell, FRP combination columns, an FRP sandwiched concrete combination bottom plate, guy rope devices with active control dampers, FRP cylindrical reticulated shells, floating FRP supporting bodies and an overall pipe inlet and outlet channel. The FRP reticulated shell dome is arranged on bosses of the FRP combination columns to form a closed roof structure. The lower end of the FRP overhung reticulated shell is fixed to the bosses of the FRP combination columns, and the upper end of the FRP overhung reticulated shell is connected to the FRP reticulated shell dome through pull rods with active control dampers. U-shaped swimming pools are formed in the two ends of the FRP sandwiched concrete combination bottom plate. The underwater supporting structure is composed of flexible spring inflation piles and a raft foundation. The part, between the FRP combination columns, of the FRP sandwiched concrete combination bottom plate is a sunken arc type bottom plate. According to the invention, the upper structure can be separated from the foundation, the buoyancy of water can be fully used, and the overall economical efficiency is high.
Owner:NORTHEAST GASOLINEEUM UNIV
Strip delivery mechanism
The invention discloses a strip delivery mechanism and belongs to the field of delivery processing mechanical equipment. The strip delivery mechanism comprises a fixing bracket, a rotating disc, a delivery belt motor, a control rod, an electromagnet, a driving connecting rod, a delivery belt pawl, a delivery belt ratchet wheel, a delivery belt roller and a belt pressing mechanism, wherein the control rod is arranged at the upper side of the rotating disc; the driving connecting rod is arranged at the lower side of the rotating disc; the outer end of one side of the rotating disc is horizontally provided with a rotating pin rod which is matched with a rotating clamping slot; one side of the delivery belt ratchet wheel is coaxially and horizontally provided with the delivery belt roller; thedelivery belt pawl is arranged at the lower side of the driving connecting rod; one end of the delivery belt pawl is meshed with the delivery belt ratchet wheel; a belt pressing bracket is arranged at one side of the upper portion of the delivery belt roller; the lower end of the belt pressing bracket is horizontally and rotationally connected with a belt pressing roller; and the belt pressing mechanism is horizontally arranged on the fixing bracket positioned at one side of a belt guide roller. The strip delivery mechanism disclosed by the invention is reasonable in structural design, stableand controllable in a strip delivery process and capable of efficiently, accurately and intermittently delivering strips so as to meet the production and application requirements.
Owner:TONGXIANG YUESHUN WRAP KNITTING
Inland-river slope type ecological protection structure
ActiveCN107299618AAvoid panningImprove permeabilityBarrages/weirsClimate change adaptationSide lyingWater flow
The invention discloses an inland-river slope type ecological protection structure which comprises a greening part, a fish tank mounting part, a slope protection part and a corner protection part. The fish tank mounting part is arranged at the position of the construction water level and comprises a fish tank mounting structure, the fish tank mounting structure comprises a plurality of side-lying rectangular fish tanks vertically lining along the bank slope, openings of the rectangular fish tanks are arranged in the manner of facing water, multiple sets of first alloy steel cages which are arranged at intervals are arranged on the slope protection part, first fish inlets and outlets are arranged in side faces and / or top faces of the first alloy steel cages, and the first alloy steel cages are filled with first ballast rocks. By the arrangement, water scouring of bank slope soil can be effectively prevented, high permeability is achieved, and the effect of material energy exchange between water and the bank slope soil is small; good ecological landscape can be built for the river bank, a diverse habitat environment can be provided for aquatic creatures, and the habitat environment can be provided for the aquatic creatures with different habitat characteristics.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
Extrusion die head adjusting device
ActiveCN102773200AAvoid panningTimely adjustment of lateral alignment accuracyLiquid surface applicatorsCoatingsSpray coatingFriction force
The invention relates to an extrusion die head adjusting device. The device comprises an extrusion die head, an extrusion die head supporting seat, and a fixed bottom plate, wherein the extrusion die head is used for spraying coating materials to a basal body; the extrusion die head is mounted on the extrusion die head supporting seat, and the extrusion die head supporting seat is mounted on the fixed bottom plate; the device further comprises a micro-adjusting device, which is used for adjusting the position of the extrusion die head, and a guiding device; the guiding device is mounted between the extrusion die head supporting seat and the fixed bottom plate and is used for reducing a friction force during a lateral movement; and a fixed end of the micro-adjusting device is mounted on the extrusion die head supporting seat or the fixed bottom plate and is used for adjusting a lateral position of the extrusion die head and the extrusion die head supporting seat. Due to adoption of the extrusion die head adjusting device provided by the invention, a problem that unqualified products are caused due to lag of a lateral contraposition adjustment and repeated adjustment of a coating area relative to the basal body is solved through controlling the position of the extrusion die head. Through adopting the micro-adjusting device to directly adjust the lateral position of the extrusion die head, the lateral contraposition accuracy of the coating area can be intuitively and properly adjusted.
Owner:SHENZHEN HAONENG TECH
Timer with rotatable socket
ActiveCN102394457AExpand the range of pluggingAvoid plugging dead endsCoupling device detailsFlexible/turnable line connectorsTimer
The invention relates to a timer with a rotatable socket. The timer comprises: a mechanical or electronic timer; a socket, which integrates a male plug and a female plug into one; and a housing, which is provided with the mechanical or electronic timer and the socket; and besides, the socket is rotatedly connected with the housing. According to the invention, a rotated connection structure is employed between a socket and an installation housing; after a socket of the timer is plugged to another socket, one end where the timer is installed or a whole housing can carry out radial rotation by taking the socket as a center; therefore, a plugging blind angle can be avoided or plugging positions can be spared for other plugs; a plugging range of the timer socket can be expanded; and plugging modes with more angles can be provided for the timer socket.
Owner:宁波泰美电器有限公司
Chemical product storage barrel facilitating transportation
InactiveCN107972953AEasy and safe transportationStack stableRigid containersChemical productsUltimate tensile strength
The invention discloses a chemical product storage barrel facilitating transportation. A chemical barrel body is included and is a hexahedron with a rectangular section; a feeding pipe is connected tothe top face of the chemical barrel body; the bottom face of the chemical barrel body is provided with a groove protruding upwards; the groove is matched with the feeding pipe; micro suction cups aredistributed on the bottom faces; the top face is a polishing face; and a supporting rod is arranged between the top face and the bottom face, and is arranged in an inner cavity of the chemical barrelbody. The storage barrel is high in strength and good in stability, it can be effectively avoided that during transportation, a chemical barrel topples over, and leakage is caused, deformation is notlikely to be caused, and safety transportation of lots of chemical products is facilitated.
Owner:CHENGDU BAIFUDE TECH CO LTD
Filling production line
PendingCN112591215AAvoid interferencePrevent disengagementArticle unpackingWrapper twisting/gatheringProduction lineReciprocating motion
The invention discloses a filling production line. The filling production line comprises a stepping conveying device, a film uncovering mechanism and a filling discharging device, the stepping conveying device comprises a conveying component, a translation driving component and a lifting driving component, and the translation driving component drives the conveying component to reciprocate in the horizontal direction of a conveying channel; the lifting driving component drives the conveying component to do reciprocating motion in the vertical direction of the conveying channel, the film uncovering mechanism comprises a support, a posture adjusting swing unit and a third driving unit, the posture adjusting swing unit comprises an air conveying pipe and a suction cup arranged on the air conveying pipe, and the third driving unit drives the support to do swing motion so that the air conveying pipe can drive the suction cup to swing; and the filling discharging device comprises a liftable objective table, a main hopper, a guide hopper and a driving component are arranged on the objective table, the main hopper is sleeved with the guide hopper, a discharging port located in the guide hopper is formed at the lower end of the main hopper, a turnover baffle is arranged in the guide hopper, and the driving component drives the baffle to turn over so as to open or close the discharging port.
Owner:HANGZHOU ZHONGYA MACHINERY CO LTD
Sleeve-frame type limiting mechanism and limiting method for controlling lateral displacement in building lifting process
The invention relates to the technical field of building lifting. A sleeve-frame type limiting mechanism for controlling lateral displacement in a building lifting process comprises a limiting column and a limiting sleeve, wherein the upper end of the limiting sleeve is arranged at the lower end of the limiting column in a sleeving mode. A sleeve-frame type limiting method for controlling lateral displacement in the building lifting process includes the steps that a plurality of sleeve-frame type limiting mechanisms for controlling the lateral displacement in the building lifting process are arranged between a lower layer of floor of a building and a lifting roof to conduct limiting, and then a jack is used for lifting the roof; each sleeve-frame type limiting mechanism for controlling the lateral displacement in the building lifting process comprises the limiting column and the limiting sleeve, wherein the upper end of the limiting sleeve is arranged at the lower end of the limiting column in a sleeving mode, the upper end of the limiting column is fixed to the lifting roof together, and the lower end of the limiting sleeve is fixed to the lower layer of floor together. The sleeve-frame type limiting mechanism and the limiting method are used for preventing horizontal displacement from happening in the lifting process of the building so as to solve the problem that excessive horizontal displacement is generated in the lifting process of the building.
Owner:ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES +1
Improved foldable bamboo mat
Owner:NANTONG JINMEILUO HOME TEXTILE
Method for converting arbitrary coordinate conversion system of BIM into construction coordinate system
ActiveCN107145652AAvoid unapplicable phenomenaComputing theory is simple and easy to understandGeometric CADDesign optimisation/simulationBacksteppingBack calculation
The invention provides a method for converting an arbitrary coordinate conversion system of BIM into a construction coordinate system. The method comprises the steps of calculating azimuth angles and various side lengths between known control points and axis intersections separately by using the known control points in the construction coordinate system and known axis intersection coordinates in a construction plane layout chart; grabbing arbitrary coordinate values of the axis intersections in the arbitrary coordinate system of a BIM model, calculating arbitrary azimuth angles and distances of the axis intersections and reversely deducing the coordinates of the control points in the arbitrary coordinate system; and carrying out back calculation on arbitrary coordinates of various structures grabbed in the BIM model and arbitrary coordinate values of the control points, calculating the numerical values, such as the included angles and the side lengths, between arbitrary coordinate points of the structures and the control points and calculating the coordinates of various structures grabbed in the BIM model, thereby meeting site construction layout.
Owner:THE 4TH CONSTR ENG CO LTD OF CHINA RAILWAY NO 4 ENG GRP +1
Mainboard testing device
PendingCN113866599ASame direction of plugging and unpluggingSimplified installation stepsPrinted circuit testingSoftware engineeringMechanical engineering
Owner:SUZHOU LANGCHAO INTELLIGENT TECH CO LTD
Limiting device used for cut-off deflection rectifying of prefabricated square pile
The invention relates to the technical field of deflection rectifying of buildings. A limiting device used for cut-off deflection rectifying of a prefabricated square pile is characterized by comprising a supporting seat and a quadrangular-prism-shaped limiting sleeve, wherein the supporting seat is used for being fixed to the lower section of the cut-off square pile, and the quadrangular-prism-shaped limiting sleeve is connected to the supporting seat and used for being arranged on the upper section of the cut-off square pile in a sleeving mode; and the quadrangular-prism-shaped limiting sleeve comprises four pieces of angle steel located at the four corners of the quadrangular-prism-shaped limiting sleeve, and horizontal connecting plates connected with the angle steel together. The limiting device used for cut-off deflection rectifying of the prefabricated square pile is used for preventing horizontal displacement when a building is jacked, and the problem that the building is liable to deflect in the jacking process is solved.
Owner:ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES
Actuator device for a bicycle gearshift
InactiveCN100515857CEasy assembly/disassemblyPrevent axial displacementChain/belt transmissionGearingGear driveControl engineering
Owner:CAMPAGNOLO SRL
Multihole machining tool of end face of air cylinder sleeve
The invention provides a multihole machining tool of an end face of an air cylinder sleeve. The machining tool comprises a drill plate (1), wherein the drill plate (1) is an circular column; one or more die holes (2) are uniformly formed in the drill plate (1) along the same circumference; drill bushings (3) are connected into the die holes (2) in a sleeving manner; the machining tool further comprises locating blocks (4); the locating blocks (4) are fixedly connected with the drill plate (1); the shapes of the locating blocks (4) are matched with those of circular arc notches (5) of the air cylinder sleeve; the drill bushings (3) are internally provided with cylindrical through holes; external walls of the drill bushings (3) are conical; hole walls of the die holes (2) are conical; and the drill bushings (3) are matched and connected with the die holes (2). The machining tool is convenient and accurate in location, simple to operate, low in machining cost, good in drilling machining effect and high in machining efficiency and is particularly applicable to multihole machining of the end face of the air cylinder sleeve of a locomotive.
Owner:襄阳襄车铁达缸套铸业有限公司
Fan-shaped ecological bank protection body and bank protection structure adopting bank protection body
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
Low-scattering X-ray fluorescence CT imaging system and method
InactiveCN109709127AReduce distractionsEasy to distinguishMaterial analysis using wave/particle radiationShaped beamStructure chart
The invention relates to a low-scattering X-ray fluorescence CT imaging system and method. The system comprises a light source, X-ray fluorescence detectors, and a data processing system. The light source is a fan-shaped beam X-ray source. The detectors are eight minitype fluorescent detectors and are classified into two groups; and each group includes four detectors. Pinhole collimators are addedin front of the detectors and are arranged at the two sides of an incident X-ray beam symmetrically; and an included angle between the collimators and the incident X-rays are 90 to 180 degrees. Fluorescent light passes through the pinhole collimators and then is received by the fluorescence detectors; the data processing system carries out conversion to obtain projection data; and then an elementdistribution structure chart of the sample is reconstructed. Therefore, the resolution and contrast of different soft tissues of medical CT images can be increased; and the interference on the photons by the Compton scattering can be reduced.
Owner:CHONGQING UNIV
Medical transfer bed
The invention discloses a medical transfer bed which comprises a bed frame, wherein a lower bottom plate is fixed to the lower portion of the bed frame, and a bed plate capable of moving up and down is arranged on the upper portion of the bed frame; a hydraulic lifting mechanism which is used for moving the bed plate up and down; a moving mechanism which is installed on the lower bottom plate andused for driving the hydraulic lifting mechanism and the bed plate to move front and back; a power transmission device which is used for driving the moving mechanism to act; an anti-rollover device which is arranged below the side surface of the lower bottom plate and is used for preventing the bed frame from rollover; and a PLC which is connected with the hydraulic lifting mechanism and the powertransmission device and is used for controlling the actions of the hydraulic lifting mechanism and the power transmission device, so that the bed plate moves up and down and back and forth to transfer patients. The PLC is adopted to control the hydraulic lifting mechanism to drive the bed plate to move up and down, and the power transmission device and the moving mechanism are adopted to drive the hydraulic lifting mechanism to move front and back, so that the bed plate moves up and down and front and back, and the purpose of transferring patients is achieved.
Owner:LIAONING TECHNICAL UNIVERSITY
Preparation and imidization method of polyimide hollow fiber membrane
InactiveCN110756063APrevent rotationAvoid panningSemi-permeable membranesDispersed particle separationImidePolymer science
The invention provides a preparation and imidization method of a polyimide hollow fiber membrane. The preparation and imidization method comprises the steps that firstly, a polyamide acid hollow fibermembrane is prepared through a dry-spraying wet-spinning method, after the coagulation is completed, an original solvent (DMAc) and residual liquid (deionized water) in coagulating bath are exchangedby solvent exchange, then a nascent fiber membrane is immersed in an imidization reagent to be cyclized at low temperature, then after the partially immersed cyclized polyamide acid hollow fiber membrane is put into an oven for heating to remove the solvent, and is continuously heated for fully imidization. According to the preparation and imidization method, polyamide acid can be partially cyclized at the low temperature firstly, the chain structure is fixed, the transfer and rotation is prevented in the subsequent heating process, the defects of the hollow fiber membrane can be effectivelylowered, and the key performances of mechanical property, pressure resistance, gas permeability and separation performance and the like of the hollow fiber membrane can be improved.
Owner:BEIJING UNIV OF CHEM TECH
Method for repairing dam buttress with foundation soil loss
The invention relates to the technical field of emergency flood fighting, in particular to a method for repairing a dam buttress with foundation soil loss with IPC being E02B 3 / 12. By adopting the repairing method, crushed stone concrete is poured at a combination part of an original apron and original foundation soil to fill gaps at a combination part of original soil and stones for consolidation, and the crushed stone concrete and a lead wire mesh are consolidated to form a whole body, so that erosion of an ordinary water level to the foundation soil is effectively prevented; a sediment cementing material is filled at a soil and stone combination part of a newly built apron and new foundation soil to form an inverted T-shaped seepage-prevention wall, so that erosion to the new foundationsoil in great floods or continuous rainfalls is effectively prevented; and an earthwork standard room is arranged at a combination part of the new foundation soil and the old foundation soil, so thatthe strength of a combination part of a new soil body and an old soil body is improved.
Owner:张传河
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