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266results about How to "Reduce sensitivity" patented technology

Fixed time anti-interference sliding mode tracking control method for under-actuated bridge crane

A fixed time anti-interference sliding mode tracking control method for an under-actuated bridge crane comprises the following steps: firstly, designing a disturbance observer which can converge in fixed time and is used for accurately estimating disturbance in a system so as to provide effective disturbance compensation information for a subsequent control strategy; secondly, in combination with the fixed time disturbance observer, a sliding mode controller is provided to ensure that the crane can accurately track a given trajectory and enable a tracking error to converge to a sliding mode surface within a fixed time. According to the invention, accurate positioning of the trolley can be realized, and load swing can be effectively inhibited in a complex environment. According to the method, the control precision and robustness of the under-actuated bridge crane in a disturbed environment can be remarkably improved, and an effective solution is provided for crane control under complex working conditions.
Owner:ZHEJIANG UNIV OF TECH

Database abnormal behavior detection method and device, electronic equipment and storage medium

The invention discloses a database abnormal behavior detection method and device, electronic equipment and a storage medium, and relates to the technical field of database security analysis, the method comprises the following steps: obtaining an operation log of a target database, and generating an operation embedding feature based on an operation record of the operation log; generating an operation feature sequence based on a recording sequence of operation records corresponding to the operation embedding features; processing the operation feature sequence according to an attention model to obtain a semantic feature sequence after intention weight adjustment; and determining an abnormal semantic proportion in the semantic feature sequence based on the abnormal behavior detection model, and generating an abnormal behavior detection result of the target database based on the abnormal semantic proportion. According to the embodiment of the invention, the operation feature sequence is generated based on the record sequence, the attention model is utilized to focus on the important features of the operation feature sequence, the recognition precision of the abnormal behaviors is improved, and the false alarm rate and the missing report rate are reduced by calculating the abnormal semantic proportion and accurately quantifying the proportion of the abnormal behaviors.
Owner:STATE GRID INFORMATION & TELECOMM BRANCH

Hollow-core optical fiber guide type cold atom inertia measurement system and use method

The invention relates to a hollow-core optical fiber guide type cold atom inertia measurement system and a use method, and belongs to the technical field of cold atom interference measurement inertia. The hollow-core optical fiber guide type cold atom inertia measurement system comprises a vacuum cavity assembly, a laser coupling module I, a laser coupling module II, a cold atom group preparation module and a gravitational acceleration measurement module, according to the invention, a uniform light potential well is constructed by using the hollow-core optical fiber with low loss, high bandwidth and large core diameter, long-distance constraint and guidance are carried out on the cold atom ensemble, and a guide light field applies an optical fiber radial constraint force to the atom ensemble, so that the degree of freedom of motion of the atom ensemble in a non-measurement direction can be inhibited; gravity measurement in a dynamic environment and gravity component measurement in any vector direction are achieved, meanwhile, the size and power consumption of the system are reduced, and integration and engineering of the system are achieved.
Owner:TIANMUSHAN LABORATORY +1

Optical lens and imaging device

ActiveCN119644564Aincrease the amount of lightImprove resolutionOptical elementsOphthalmologyOptical axis
The invention discloses an optical lens and imaging equipment, the optical lens sequentially comprises a first lens, a second lens with focal power, a third lens, a fourth lens with focal power, a fifth lens with focal power and a sixth lens with focal power from a first side to a second side along an optical axis, the first lens has negative focal power, the second lens has focal power, the third lens has focal power, the fourth lens has focal power, the fifth lens has focal power, and the sixth lens has focal power. The first side surface and the second side surface are concave surfaces; the third lens has positive focal power, and the first side surface of the third lens is a convex surface.
Owner:NINGBO SUNNY AUTOMOTIVE OPTECH

Optical system

PendingCN119667915AReduced risk of excursionreduce sensitivityMountingsOptic systemMaterials science
The invention provides an optical system. The optical system comprises a lens barrel, a lens group and at least one spacer, and the lens group and the spacer are arranged in the lens barrel. The five lenses are sequentially a first lens with negative focal power, a second lens with positive focal power, a third lens with focal power, a fourth lens with focal power and a fifth lens with focal power from the object side to the image side; eP01 / CT1 is greater than or equal to 1.92 and less than or equal to 3.08; and (EP2 + T23) / CT3 is greater than or equal to 1.04 and less than or equal to 2.86. The problem that in the prior art, a five-piece optical system meets the optical performance requirement by restraining the size of a front-end lens, so that the assembling stability is poor, and then a defocus curve deviates is solved.
Owner:ZHEJIANG SUNNY OPTICAL CO LTD

Bridge crack identification method and system, electronic equipment and storage medium

The invention discloses a bridge crack identification method and system, electronic equipment and a storage medium. The method comprises the following steps: acquiring a bridge image; a bridge image is input into the trained bridge crack recognition network, and the trained bridge crack recognition network is used for performing feature extraction on the input bridge image by adopting a C2fPonv module, performing feature fusion on the extracted features by adopting a multi-scale attention module EMA, recognizing the fused features to obtain a plurality of prediction frames, and identifying the prediction frames; screening the prediction frames by adopting non-maximum suppression to obtain a bridge crack recognition result; a loss function adopted in the network training process is used for inhibiting the gradient when the difference between a prediction frame and a target frame is smaller than a set threshold value, so that the network focuses on identification of a difficult-to-predict sample.
Owner:SHANDONG HI-SPEED MATERIALS GRP CO LTD +1

Bimetal / carbon nanotube compound modified glassy carbon electrode and preparation method and application thereof

PendingCN119666952ANo obvious reunionLarge specific surface areaMaterial electrochemical variablesBimetallic nanoparticleCarbon nanotube fet
The invention discloses a bimetallic / carbon nanotube compound modified glassy carbon electrode as well as a preparation method and application thereof, and belongs to the technical field of electrochemical analysis. The bimetallic / carbon nanotube compound modified glassy carbon electrode provided by the invention comprises a glassy carbon electrode substrate and a bimetallic / carbon nanotube compound compounded on the glassy carbon electrode substrate, the bimetallic / carbon nanotube compound is prepared from nickel-cobalt bimetallic nanoparticles and a multi-walled carbon nanotube. The prepared bimetallic / carbon nanotube compound modified glassy carbon electrode has excellent electrocatalytic activity, has the advantages of good stability, low detection limit and high sensitivity and selectivity in the process of determining paracetamol, can realize on-site rapid detection of paracetamol, has the advantages of being convenient to carry and simple to operate, and has a wide application prospect. Wide application prospects are realized in medicine safety and clinical medical treatment.
Owner:HANGZHOU NORMAL UNIVERSITY

Conductive terminal assembly and connector

Provided are a conductive terminal assembly and a connector, the conductive terminal assembly comprises a conductive terminal, one end of the conductive terminal is provided with an insertion portion, the insertion portion is provided with an insertion cavity for insertion of a mating terminal, and the mating terminal is inserted into the insertion cavity. The conductive terminal assembly further comprises a sleeve sleeved outside the plugging part and a locking structure for fixing the sleeve and the plugging part together, and the locking structure comprises a protruding part protruding from one of the side wall of the plugging part and the side wall of the sleeve to the other one of the side wall of the plugging part and the side wall of the sleeve. The protruding part is matched with the other one of the side wall of the inserting part and the side wall of the sleeve so as to restrain the sleeve from moving relative to the inserting part. According to the conductive terminal assembly, the sleeve and the conductive terminal only interfere at the position of the protruding part, so that the sensitivity of the conductive terminal assembly to size and shape changes is reduced, the production efficiency can be improved, and the manufacturing cost is reduced.
Owner:TYCO ELECTRONICS (SUZHOU) CO LTD +1

Soluble skin-adhering microneedle for delivering enterovirus inactivated vaccine as well as preparation method and application of soluble skin-adhering microneedle

The invention relates to the technical field of biological medicines, in particular to a soluble skin-adhering microneedle for delivering an inactivated enterovirus vaccine as well as a preparation method and application of the soluble skin-adhering microneedle. Sodium hyaluronate is adopted as a film forming material to wrap an enterovirus 71 type (EV71)-coxsackie virus A16 (CA16) type bivalent inactivated vaccine antigen, and a needle body layer of the soluble microneedle is formed; the substrate layer is prepared from a pullulan material, so that the microneedle patch with a stable overall structure is formed. The technology provided by the invention is completed in a clean environment, and the vaccine patch which is qualified through sterility detection is obtained. The soluble microneedle disclosed by the invention has good antigen stability under the condition of 2-8 DEG C. In animal experiments, the microneedle is attached to the skin surface of a mouse for skin-adhering immunization, a strong immune response reaction can be induced, good immunogenicity is shown, and a novel, safe and effective vaccine delivery way is provided for prevention and control of the infantile hand-foot-and-mouth disease.
Owner:INST OF MEDICAL BIOLOGY CHINESE ACAD OF MEDICAL SCI

Fan state detection method and device and server

The invention provides a fan state detection method and device and a server. According to the method provided by the invention, the running state of the fan is obtained, the state of the fan is classified more meticulously and richer based on the running state, the precision is more accurate and more meticulous, and an administrator can capture different types of problems more accurately through more accurate fan state judgment; therefore, the specific state of the fan can be mastered more clearly, and an administrator can locate problems more quickly and accurately and take corresponding measures conveniently. In addition, by subdividing the state of the fan, a more refined preventive maintenance strategy can be realized, potential problems can be found and solved in time, the fault risk of the server is reduced, and the stability and reliability of the system are improved. And finally, subdividing the fan state is beneficial to improving the overall server management and maintenance level, so that a manager can more comprehensively understand the server state and make a more intelligent decision, thereby improving the performance and availability of the whole server system.
Owner:ZHUOXIN (TIANJIN) INFORMATION TECHNOLOGY CO LTD

Low-concentration hydrogen detection MIS type film sensor and preparation method thereof

The invention discloses a low-concentration hydrogen detection MIS type thin film sensor and a preparation method thereof, and belongs to the technical field of oil-immersed transformer online fault monitoring. The sensor sequentially comprises a metal nickel sheet substrate, a nickel oxide semiconductor layer, an insulating layer, a base layer and an electrode layer from bottom to top, the electrode layer comprises a catalytic electrode layer and a gold connection electrode layer; the insulating layer is any one of silicon oxide, aluminum oxide, silicon nitride and aluminum nitride; the bottom layer is any one of chromium, titanium, nickel-chromium and titanium-tungsten; and the catalytic electrode layer is one or a compound of platinum and palladium. The low-concentration hydrogen detection MIS type thin film sensor has the advantages that the low-concentration hydrogen detection MIS type thin film sensor is provided by fully considering the problems that the transformer insulating oil environment temperature change is large and the hydrogen concentration is low according to the requirement for on-line monitoring of the hydrogen concentration in the transformer insulating oil, the sensitivity is high, the detection lower limit is low, the sensor machining and packaging difficulty is lowered, and the cost is reduced. Good application prospects are realized.
Owner:STATE GRID ANHUI ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST

A MEMS capacitive sensor

This utility model discloses a MEMS capacitive sensor, relating to the field of micro-motor technology. Anchor points and a fixed structure are fixedly arranged. Elastic beams and connecting beams are perpendicular to each other. The anchor points support the inner frame via the elastic beams, making the inner frame suspended. The inner frame, in turn, supports the mass frame via the connecting beams, making the mass fixed structure frame suspended. Movable comb teeth on the mass frame and fixed comb teeth on the fixed structure are spaced and interleaved to form a differential capacitor. The movable and fixed comb teeth use differential output, which can differentially eliminate the capacitance change caused by vibration or acceleration of non-detected axes, preventing signal output. This helps reduce the sensor's cross-axis sensitivity and improve sensor performance.
Owner:RAYTRON(WUXI) TECH CO LTD

Training method of image encoder, image processing method, electronic device, storage medium and program product

The embodiment of the application provides a kind of training method of image encoder, image processing method, electronic equipment, storage medium and program product, it is related to image processing technical field, the training method of image encoder includes: training image is input image encoder, visual word symbol for representing image feature is extracted by the image encoder;Clothing text word symbol is generated for training image;The clothing text word symbol is used to describe the clothing feature of the person in the training image;The model parameter of the image encoder is iteratively trained using a combination loss function;The combination loss function is used to make the visual word symbol of the same person of multiple training images be smaller, and make the visual word symbol and the clothing text word symbol of the same training image be larger difference.It reduces the degree of dependence on visual information by introducing text modal, increases the precision of image encoder to identify the same person under different clothing, improves the precision and robustness of person re-identification.
Owner:PEKING UNIV

A full-mechanical automatic tracking self-balancing variable current stabilizing device and its using method

The application relates to a full-mechanical automatic tracking self-balancing variable current voltage stabilizing device and a use method thereof, which comprises a main pipe and two gear connecting rod combined mechanisms arranged on the two sides of the main pipe respectively; the gear connecting rod combined mechanism comprises a bellows, a pressing plate pressed on one end of the bellows far from a water inlet pipe, and a pressing rod pressed on the hose; one end of the bellows is sealingly connected with the pipe wall of the water inlet pipe, the other end is sealingly fixedly connected with the pressing plate, a supporting rod extending away from the bellows is fixed on the pressing plate, a spring is connected with one end of the supporting rod far from the pressing plate, and the other end of the spring far from the supporting rod is fixedly arranged; the gear connecting rod combined mechanism further comprises a driving gear and a driven gear which are mutually meshed. The application changes the flow area of the hose through the gear transmission mechanism of each connecting rod and the expansion and contraction of the bellows when the water pressure changes, so that the flow is stored and the pressure is increased when the pressure is low, the municipal end water pressure is prevented from being lower than the minimum allowable value due to excessive secondary water supply and water taking, no external power is needed, and the automatic tracking and self-balancing functions are achieved.
Owner:NANJING WEIQI TECH CO LTD

A layered continuous inverse kinematics solving method for fiber reciprocating winding of cylindrical component

ActiveCN122463170BReduce movement mutationscontinuous speed
The application discloses a layered continuous inverse kinematics solving method for fiber reciprocating winding of a cylindrical component and belongs to the technical field of robot end control. Based on a fiber winding task of a six-axis robot cylindrical component, trajectory modeling and pose generation are carried out; a kinematics model of the six-axis robot is established; a Jacobian matrix and singularity representation thereof are obtained; end pose error is defined; the fiber winding task of the six-axis robot cylindrical component is described as a continuous inverse kinematics problem; full-pose inverse kinematics iteration is carried out by using a damped least square method; initial value generation based on state prediction is carried out for the fiber winding task of the six-axis robot cylindrical component; a position rollback strategy is set; and the continuous inverse kinematics problem is solved. The application aims at solving the problems of poor continuity of the end trajectory of the six-axis robot, strong attitude constraint and unstable end reversing solving in the fiber winding process of the cylindrical component.
Owner:HARBIN COMPOSITE EQUIP

Integrated washer dryer

PendingEP4394120A4avoid damageairflow can be efficiently preventedOther washing machinesWashing machine with receptacles
An integrated washer dryer, comprising a drum (R) and a drying module (D). The drying module (D) comprises a moisture absorption and moisture removal component (D1), a moisture absorption channel (D2), and a moisture removal channel (D3). The moisture absorption channel (D2) comprises a moisture absorption channel air inlet (D21) and a moisture absorption channel air outlet (D22). The drum (R) is communicated with the moisture absorption channel air inlet (D21) and the moisture absorption channel air outlet (D22), respectively. A moisture absorption channel fan (D23) is provided in the moisture absorption channel (D2) to form a moisture absorption air stream in the drum (R) and the moisture absorption channel (D2). A moisture removal channel fan (D33) is provided in the moisture removal channel (D3) to form a moisture removal air stream in the moisture removal channel (D3). The moisture absorption and moisture removal component (D1) is provided in a path of the moisture absorption channel (D2) and the moisture removal channel (D3), so that the moisture absorption air stream and the moisture removal air stream both flow through the moisture absorption and moisture removal component (D1), so that the moisture absorption and moisture removal component (D1) absorbs moisture of the moisture absorption air stream during rotation and discharges the absorbed moisture by means of the moisture removal air stream.
Owner:NANJING ROBOROCK INNOVATION TECH CO LTD

Micro light emitting diode based on polarization orientation difference regulation and preparation method thereof

PendingCN122121356AInhibited Diffusionavoid non-radiative recombinationElectron holeEtching
The application discloses a micro light emitting diode based on polarization orientation difference regulation and a preparation method thereof. The micro light emitting diode comprises a substrate layer, and a plurality of first regions and second regions arranged alternately on the substrate layer; the first region comprises a non-doped nitrogen-polar nitride layer, a first n-type ohmic contact layer and an n-type electrode which are sequentially stacked; the second region comprises a nucleation layer, a non-doped metal-polar nitride layer, a second n-type ohmic contact layer, a multi-quantum well active region, an electron blocking layer, a p-type hole injection layer, a p++-type ohmic contact layer and a p-type electrode which are sequentially stacked; wherein the second region is a light emitting unit of the device, and a mesa structure thereof is defined by wet etching; the first region and the adjacent second region form a homopolar junction in the horizontal direction. By constructing nitride epitaxial structures with different polarities on the same substrate, a lateral carrier migration potential barrier is formed, and at the same time, etching damage is eliminated by wet etching, so that side wall non-radiative recombination is avoided.
Owner:XIDIAN UNIV

A manufacturing method of hydrogen embrittlement resistant high-strength bolt based on microsphere shot peening and the bolt

PendingCN122081619AGuaranteed fitAchieve foundation strengthening of the entire surfaceNutsBoltsStress concentrationSurface cleaning
A method for manufacturing high-strength, hydrogen-embrittlement-resistant bolts based on microsphere shot peening, and the bolts themselves, are disclosed. The manufacturing method includes: S1, cold heading and thread rolling of alloy structural steel billets to obtain bolt forming parts; S2, surface cleaning of the bolt forming parts, followed by overall surface peening with microspheres driven by high-pressure air; after overall peening, targeted strengthening peening treatment is performed on stress concentration areas such as thread roots, undercut grooves, and flange transition corners to obtain reinforced bolt parts; S3, the reinforced bolt parts are cleaned, dried, and phosphated to obtain finished bolt parts. This design, through a "overall + targeted" composite microsphere shot peening strategy, introduces a uniform residual compressive stress field and a micron-level fine-grained plastic deformation layer on the bolt surface, forming a thicker strengthening layer in stress concentration areas, significantly improving the fatigue strength and delayed fracture resistance of high-strength bolts, while ensuring uniform surface roughness and stable assembly friction coefficient.
Owner:WUHAN TANWENG TECH CO LTD

Three-dimensional optical control method based on metasurface

PendingCN121763481Astable captureStable and controllableRadiation/particle handlingPolarising elementsNanopillarThree-dimensional space
The invention relates to a three-dimensional optical control method based on a metasurface, and the method comprises the steps: scanning a nano-column unit structure to construct a phase library, selecting high-efficiency half-wave plate nano-columns with phase coverage from-pi to pi from the phase library for the construction of the metasurface, cooperatively introducing a geometric phase and transmission phase regulation and control mechanism, and combining spatial multiplexing arrangement to construct a metasurface. Independent regulation and control of different circular polarization light fields under different wavelengths are realized, so that four switchable optical control focuses are generated in a three-dimensional space; by switching the polarization state or the working wavelength of the incident light, stable capture and controllable transfer of the particles are realized in the space. Compared with the prior art, the method has the advantages that three-dimensional optical control over particles is achieved in an on-chip structure, the control freedom degree is high, and the control adjusting mode is simple and efficient.
Owner:TONGJI UNIV

Performance verification device and method of photoelectric fusion sensor for GIS (Gas Insulated Switchgear) partial discharge detection

The invention belongs to the technical field of photoelectric fusion sensor verification, and relates to a performance verification device and method of a photoelectric fusion sensor for GIS partial discharge detection. The device comprises a test voltage generation section, a first test section and a second test section. The test voltage generation section comprises a non-partial-discharge test transformer and a test protection resistor. The first test section is a linear GIS bus section provided with a first photoelectric fusion sensor mounting flange window and a first defect replacement flange window; the second test section is an L-shaped GIS bus section, the long section of the second test section is provided with a second photoelectric fusion sensor installation flange window, and the middle part of the short section of the second test section is provided with a second defect replacement flange window. The test device for verifying the performance of the photoelectric fusion sensor is provided for the first time, a reliable basis is provided for field application of the photoelectric fusion sensor, partial discharge near the sensor is verified, and the effectiveness of far-end partial discharge sensor detection is also tested.
Owner:STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +3

Hair product containing phyllanthus emblica extract as well as preparation method and application of hair product

The invention provides a hair product containing a phyllanthus emblica extract as well as a preparation method and application of the hair product. According to the invention, when the molecular weight of the emblic leafflower fruit extract is 500-1000Da, the emblic leafflower fruit extract is compounded with specific types of emulsifying thickening agent, solubilizing penetration enhancer, color developing agent and other components to obtain a hair product with better stability, so that the dyed hair has better elasticity, combability and luster; the sensitive degree of dyed hair to ultraviolet rays can be reduced, so that the hair quality damage caused by dyeing can be greatly reduced.
Owner:GUANGZHOU RIDGEPOLE BIOLOGICAL TECH CO LTD

Multi-mode magneto-rheological actuator

The application discloses a multi-mode magneto-rheological actuator, which comprises a magneto-rheological damper, a working cylinder and a control cylinder which are connected in parallel, a piston is arranged in the working cylinder, so that the working cylinder is divided into a first working cavity and a second working cavity by the piston; an adjusting valve core is arranged in the control cylinder, so that the control cylinder is divided into a first control cavity and a second control cavity by the adjusting valve core; the first working cavity, the second working cavity, the first control cavity and the second control cavity are filled with magneto-rheological fluid; the first working cavity is communicated with the first control cavity, and the communication flow in the two cavities is controllable; the second working cavity is communicated with the second control cavity, and the communication flow in the two cavities is controllable; the two cavities are filled with magneto-rheological fluid; the magneto-rheological actuator has two working modes, a mode switching switch of active damping and magneto-rheological semi-active damping is formed by a motor and the adjusting valve core, and model selection is actively carried out for different scenes, so that the damping requirements of different application scenes can be met.
Owner:CHONGQING WULING ZHIXING TECHNOLOGY CO LTD

Tendon rope driven dexterous hand finger for metacarpophalangeal joint movement decoupling

The invention discloses a tendon-rope-driven dexterous hand finger for metacarpophalangeal joint movement decoupling. A flexion and extension rotating joint and a side-sway rotating joint of the tendon-rope-driven dexterous hand finger are both of a bidirectional rotating structure controlled by a rope driver; the side-sway rotating joint is of a rolling meshing structure formed by two toothed plate components, rope guide wheels are arranged on the two toothed plate components, the two rope guide wheels are used for guiding and outputting a flexion and extension driving rope of the flexion and extension rotating joint and a side-sway driving rope of the side-sway rotating joint, and the winding directions of the flexion and extension driving rope on the two rope guide wheels are opposite. The two free ends of the side-sway driving rope are guided by the rope guide wheels to be arranged in a staggered mode. After the scheme is adopted, a transmission link capable of realizing side-sway motion and flexion-extension motion is decoupled, so that the effective length change of the flexion-extension driving rope caused by the side-sway motion is completely compensated geometrically, and the effective length of the flexion-extension link is kept constant at any side-sway angle; and the action stability and the repeated positioning performance of the fingers of the dexterous hand under the multi-posture and multi-load conditions are improved.
Owner:SUN YAT SEN UNIV

Static phase distortion compensation system of spatial light modulator

PendingCN121857203AImplement static phase distortion compensationEnsure robustnessOptical elementsBeam splitterSpatial light modulator
The invention relates to the technical field of light field regulation and control, and discloses a static phase distortion compensation system of a spatial light modulator, which comprises a polarization splitting prism arranged in the light emitting direction of a laser and used for adjusting a light beam emitted by the laser into linearly polarized light in the horizontal direction, the first quarter-wave plate adjusts the linearly polarized light into circularly polarized light and irradiates the circularly polarized light to the spatial light modulator; a second quarter-wave plate arranged in the light emitting direction of the spatial light modulator adjusts an emergent light beam of the spatial light modulator into linearly polarized light, and a linear polarizer performs polarization analysis on the emergent light beam of the second quarter-wave plate; the static phase error of the spatial light modulator is determined through the polarization direction included angle of the incident beam of the first quarter-wave plate and the emergent beam of the second quarter-wave plate, and the polarization direction included angle is determined through the Malus law relation of the incident light intensity and the transmission light intensity of the linear polarizer. The static phase distortion of the spatial light modulator is compensated by using the phase error, and the static phase distortion compensation cost is reduced.
Owner:XI AN JIAOTONG UNIV

Anchors-based clustering guidance data classification method, device and equipment

The application discloses an anchor point guided clustering based data classification method, device and equipment, relates to the technical field of digital data processing, and comprises the following steps: obtaining an original data set to be classified, converting each sample data into a numerical vector, and constructing a data matrix; initializing a clustering center matrix and an anchor point matrix, and setting a fuzzy coefficient; obtaining the anchor point matrix and the clustering center matrix after joint iterative optimization; calculating the fuzzy membership degree of each sample vector; the category with the maximum fuzzy membership degree is taken as the final category label of the sample vector, and the classification results of all sample vectors are output. The application solves the problems that the existing fuzzy clustering method is sensitive to initial conditions, is easy to fall into a suboptimal solution, leads to unstable and inaccurate classification results, and cannot be directly solved by using a gradient descent algorithm, and is difficult to be applied to large-scale data sets, and realizes the enhancement of complex data classification precision and the applicability in different data scale scenes.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Flyback transformer structure with variable inductance

The invention provides a variable-inductance flyback transformer structure, which comprises a flyback transformer main body, a magnetic core is arranged on the outer package of the middle part of the flyback transformer main body, a main winding is fixedly mounted on the inner wall of the middle part of the magnetic core, a secondary winding sleeves the outer wall of a side column on one side of the magnetic core, and a high-low air gap is formed in the outer wall of a side column on the other side of the magnetic core; the stepped air gap or the slope air gap is arranged, and when the magnetic core is close to saturation, the inductance value is reduced; according to the flyback transformer, the step air gap or the slope air gap is utilized, the saturation effect in the magnetic core is gradually promoted from the narrow side of the air gap to the wide side, under the condition of low-voltage input, the magnetomotive force is large, the saturation is promoted to the wide position greatly, and the inductance value of the flyback transformer is reduced; and under the condition of high-voltage input, the magnetomotive force excited by the flyback transformer is relatively small, and the narrower side of the air gap is saturated or unsaturated, so that the inductance of the flyback transformer is reduced or even not reduced, and the optimization design of the variable inductance of the flyback transformer structure is realized.
Owner:SHENZHEN ZHENHUA MICROELECTRONICS

Photoelectric sensor system conversion efficiency calibration system and method based on reverberation chamber

The invention discloses a photoelectric sensor system conversion efficiency calibration system and method based on a reverberation chamber, and belongs to the technical field of photoelectric sensor conversion efficiency calibration, the system comprises an electric wave reverberation chamber, a transmitting antenna, a reference antenna and a photoelectric field sensor system; the photoelectric field sensor system is composed of a photoelectric sensor, a laser source, a photoelectric detector, a polarization maintaining optical fiber and a single-mode optical fiber. In the calibration process, the reference antenna and the photoelectric sensor system are used as receiving ends respectively, receiving power at different stirring positions in the reverberation chamber is sampled to obtain two groups of transfer functions, and the total efficiency of the photoelectric sensor system is determined by comparing the two groups of transfer functions under the condition that the radiation efficiency of the reference antenna is known. The conversion efficiency of the photoelectric sensor system is obtained by combining the relation among the power, the field intensity and the total efficiency in the free space; and the effective averaging of the incident direction and the polarization state is realized by using the uniform and isotropic electromagnetic field characteristics of the reverberation chamber.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Printed circuit board, communication device and vehicle

The utility model discloses a printed circuit board, a communication device and a vehicle. The printed circuit board comprises a dielectric related interface, an electrostatic impedor, a common-mode resistor, an alternating-current coupling capacitor, a common-mode filter and a control chip, and a differential signal line is connected to the control chip through the electrostatic impedor, the common-mode resistor, the alternating-current coupling capacitor and the common-mode filter in sequence; wherein the differential signal lines are arranged based on a cross-layer reference mode; wiring of the positive signal line and the negative signal line of the differential signal line, pin bonding pads on wiring paths and via holes in the wiring paths are all symmetrically arranged, and the positive signal line and the negative signal line are matched in equal length. Through the symmetrical arrangement and equal-length matching of the differential signal lines and the use of the electrostatic impedor, the common-mode resistor, the alternating-current coupling capacitor, the common-mode filter and other elements, noise and interference are effectively suppressed, and the integrity of signals is improved. The cross-layer reference and the reasonable wiring strategy help to reduce electromagnetic radiation and sensitivity, and improve the electromagnetic compatibility of the printed circuit board.
Owner:NOBO AUTOMOTIVE TECH CO LTD

Control method and system for local gluing of outer surface of metal round piece

The invention provides a control method and system for local gluing of the outer surface of a metal round piece, and belongs to the technical field of intelligent gluing control. The method comprises the following steps: firstly, acquiring a current outer surface image and process task data of a to-be-glued metal round piece, and determining a target local gluing area, a state detection area and a target glue line parameter; releasing detection glue points in a state detection area, acquiring a detection dynamic image sequence, and extracting spreading length, edge expansion rate, necking rate, broken wire time delay and retraction displacement to form a dynamic morphology feature sequence; inputting the dynamic morphology feature sequence into a glue solution rheological state inversion model, and solving a current glue solution rheological state parameter; local gluing is carried out according to the formal gluing control instruction, and a local glue line forming result is output in combination with an outer surface result detection record. According to the method, the current flowing state of the glue solution can be recognized before formal gluing, gluing control parameters are synchronously adjusted according to the current flowing state, and the forming stability of local gluing glue lines on the outer surface of the metal round piece is improved.
Owner:SHANGHAI CHEN CHANG EXACT MOULD CO LTD

Anti-interference wireless passive temperature measurement system based on RFID

The invention relates to an anti-interference wireless passive temperature measurement system based on a radio frequency identification (RFID) technology. The anti-interference wireless passive temperature measurement system comprises a temperature sensor and a reader antenna. The temperature sensor comprises a sensor antenna, and the sensor antenna is a linearly polarized antenna. The reader antenna is a circularly polarized antenna and is in communication connection with the temperature sensor. The sensor antenna and the reader antenna transmit and receive signals by using broadband. According to the anti-interference wireless passive temperature measurement system, the temperature data of the detected object in the operation process can be accurately monitored and obtained in real time, the frequency band requirements of different areas can be met, the influence of frequency band deviation caused by the environment can be reduced by adopting broadband signal receiving and transmitting, and the anti-interference wireless passive temperature measurement system has the advantages of being simple in structure and convenient to use. The antenna is not sensitive to the direction of the position where the temperature sensor is placed, and high gain of the reader antenna is achieved.
Owner:SCHAEFFLER TECHNOLOGIES AG & CO KG