2215 results about "Linear arrays" patented technology

The invention discloses a single-bit direction of arrival estimation method and system with signal amplitude recovery, a terminal and a storage medium, and the method comprises the steps: obtaining each snapshot time signal from a signal source of a uniform linear array receiver, introducing a non-zero threshold value to carry out the single-bit quantization of each snapshot time signal, and obtaining a signal model; reconstructing the signal model, replacing a sign function of the reconstructed signal model with a smooth hyperbolic tangent function, and performing reconstruction to obtain a target signal model; based on the target signal model, constructing a single-bit DOA estimation optimization problem by using a truncated Frobenius norm and an L2, 0 norm, and converting the optimization problem into a target optimization problem by using a semi-quadratic technology; and solving a target optimization problem by using a near-end alternating minimization algorithm and a forward-backward splitting algorithm to obtain a signal source estimation direction, a signal source estimation number and a signal estimation amplitude. According to the method, the amplitude of the signal source is accurately estimated while the prior dependence on the number of the signal source is eliminated.

The invention provides a coherent signal arrival direction estimation method and device based on a deep convolutional network, and belongs to the field of array signal processing. The method comprises the following steps: receiving a to-be-detected signal containing a coherent signal by using a uniform linear array antenna to obtain an array receiving data matrix and extract a covariance matrix; forming an input feature vector by right upper triangular elements divided from a diagonal line in the covariance matrix, inputting the input feature vector into a covariance estimation model formed by a deep convolutional network, obtaining an estimation value of the right upper triangular elements under an ideal incoherent condition, and reconstructing the estimation value to obtain a covariance matrix estimation value; and performing characteristic decomposition on the covariance matrix estimation value, and generating a spatial spectrum by using a MUSIC algorithm to obtain an estimation result of the signal arrival direction. According to the method, the noise-containing mixed signal covariance matrix is mapped into the ideal incoherent noise-free signal covariance matrix through a physical constraint supervised learning framework, so that the estimation precision and robustness of the MUSIC algorithm in a coherent scene are improved.

The invention discloses a low-voltage cable branch box with protection structures at wire inlets, and belongs to the technical field of cable branch boxes, the low-voltage cable branch box comprises a box body, the interior of the box body is fixedly connected with a mounting rack for mounting electrical appliance elements through bolts, the bottom of the box body is provided with a plurality of wire inlets distributed in a linear array, and the wire inlets are arranged in the box body. The bottom of the inner wall of the box body is fixedly connected with a fixing frame corresponding to each wire inlet, and the front and back surfaces of the fixing frame are movably provided with plugging plates in a penetrating manner. The plugging plate is arranged to plug the wire inlet, and the gap sealing mechanism is arranged to fill and seal the gap between the cable and the plugging plate, so that external humid gas cannot enter the box body from the wire inlet, and when the sealing door of the box body is in a closed state, the whole branch box can be in a totally closed state; dust or humid gas in external air is prevented from entering the branch box, and electronic components in the branch box are well protected.

The invention discloses a deep-sea self-expanding horizontal array acoustic subsurface buoy, which relates to the field of deep-sea underwater acoustic detection and comprises an expanding platform arranged at the top of the acoustic subsurface buoy, a subsurface buoy main body positioned below the expanding platform and an anchoring structure connected below the subsurface buoy main body, the subsurface buoy body comprises a buoyancy platform arranged below the unfolding platform and an equipment platform arranged below the buoyancy platform. The problem that a hydrophone linear array composed of a plurality of large-scale acoustic linear arrays is folded and automatically unfolded into a cross horizontal array is solved, and integration of a deep-sea acoustic emission system, an acoustic receiving system, an underwater acoustic communication system and an equipment supply system is achieved. The whole subsurface buoy can be quickly and conveniently released and recycled, and high-reliability anchor mooring is achieved.

The invention discloses a server liquid cooling cabinet group heat dissipation system with phase change energy storage, which comprises two linear array type server liquid cooling cabinet groups, two cooling capacity distribution units, two heat pipe air conditioner all-in-one machines, a multi-channel cold liquid distributor, a multi-channel hot liquid backflow device and the like, the all-in-one machine comprises a heat pipe natural cold source refrigerating loop and a compressor mechanical refrigerating loop, the two refrigerating loops independently or jointly provide an outdoor cold source, heat of all the liquid cooling cabinets is transmitted to the all-in-one machine in the cold capacity distribution unit, and therefore the heat is transmitted out of the machine room. A phase change energy storage flow channel is preferably arranged on the primary side of the intermediate heat exchanger in parallel, cold storage and buffering are achieved by switching a channel, a cold storage and cold release intelligent control strategy based on a lag temperature difference threshold value is constructed, a main cold source linkage and cold source switching smooth transition mechanism is achieved, the thermal stability, operation continuity and response capacity of the system are improved, and the system reliability is improved. The liquid cooling heat dissipation device is suitable for data center liquid cooling heat dissipation scenes with high heat density, high energy efficiency and high reliability requirements.

The present invention discloses a wide microstrip antenna array based antenna system for millimeter wave applications. The microstrip antenna array based antenna system of the present invention includes plurality of patch antennas and each of the patch antennas includes a U-slot of unequal arms. This patch antenna with the U-slot acts as the array element. The array elements are placed in a linear array at a distance of λ / 2 from each other on the antenna substrate to achieve desired scan performance. The microstrip corporate feed network with T-junction power divider is used. The antenna elements are fed by electromagnetic coupling with the feed network. The antenna array with dummy elements on both sides of the linear array together with an extra ground plane is used to achieve improved array performance with high main lobe gain and reduced side lobe.

The invention relates to the technical field of satellite internet, and discloses a low-orbit satellite phased array multi-beam interference modeling and suppression method and system, and the method comprises the steps: selecting a Kaiser window as a core filtering method, and achieving the optimization of beam characteristics through the dynamic adjustment of a shape parameter beta; generating an initial beam directional diagram based on a digital phase matching method, and multiplying the Kaiser window function coefficient by the excitation weight of the 64-array-element linear array element by element to realize spatial domain weighted filtering; the method comprises the following steps: constructing a training data set containing multi-scene interference characteristics, calculating a corresponding covariance matrix and an accurate inverse matrix thereof to form a sample pair, designing a deep neural network architecture, inputting a flattened covariance matrix vector, and learning a complex nonlinear mapping relation from the covariance matrix to the inverse matrix through a multi-layer full-connection structure; a mean square error is used as a loss function to constrain network output precision, and a multi-beam interference system model is constructed; according to the invention, stable and efficient communication of the low-orbit satellite system in a complex electromagnetic environment and under rapid channel change is ensured.

The invention relates to the field of sound velocity, opto-acoustic and ultrasonic imaging, in particular to a dynamic sound velocity self-adaptive ultrasonic opto-acoustic bimodal imaging method and a dynamic sound velocity self-adaptive ultrasonic opto-acoustic bimodal imaging system. The method comprises the following steps: acquiring an ultrasonic signal and a photoacoustic signal; reconstructing a sound velocity distribution diagram according to the ultrasonic signal; based on the sound velocity distribution diagram, reconstructing a related time delay diagram; and reconstructing an ultrasonic image and a photoacoustic image based on the related time delay graph. The problems that a traditional sound velocity correction method is limited in application range, inconvenient to operate, high in cost, low in resolution and the like are solved; the adopted sound velocity correction algorithm is high in resolution, is suitable for various transducers of linear arrays, convex arrays, ring arrays, spherical arrays and the like, and is widely applied to most parts of a human body; cancerous tissues, normal tissues, muscles, fat and the like can be accurately distinguished; the ultrasonic and photoacoustic dual-mode imaging system is simple in structure, is not influenced by illumination, is high in sound velocity resolution and signal-to-noise ratio, supports seamless correction and registration of ultrasonic and photoacoustic dual-mode imaging, and promotes clinical application and development of ultrasonic and photoacoustic dual-mode imaging.

The invention discloses a two-dimensional bionic multi-stage conical flow divider for laser processing and an application device thereof, and the two-dimensional bionic multi-stage conical flow divider is characterized in that the upper surface and the lower surface of the two-dimensional bionic multi-stage conical flow divider are provided with micro-groove structures, and the micro-groove structures are longitudinal parallel grooves distributed in a linear array; the two-dimensional bionic multistage cone flow divider is of a bilateral symmetry structure and specifically comprises a single primary main cone and a plurality of secondary small cones on the single side, the secondary small cones are distributed on the two sides of the primary main cone at equal intervals, and the included angle between each secondary small cone and the primary main cone ranges from 9 degrees to 21 degrees. The cone angle of the first-stage main cone structure is 9-21 degrees, the length of the first-stage main cone structure is 8-12 mm, the cone angle of the second-stage small cone structure is 9-21 degrees, the length of the second-stage small cone structure is 1-3 mm, the depth of the micro-groove structure is 35-45 micrometers, and the center-to-center distance of the micro-groove structure is 28-35 micrometers. According to the two-dimensional bionic multistage conical flow divider for laser processing and the application device thereof, the problem that the efficiency of spontaneous continuous separation of existing multiphase immiscible organic liquid drops is low is solved.

The present invention relates to the technical field of plastic aging evaluation, and specifically to a plastic aging performance evaluation instrument, comprising a chassis; a take-in and put-out port, which is opened on the side of the chassis; a cover plate, which is arranged on the inner side of the take-in and put-out port; a plurality of solar light panels, which are distributed in a linear array and fixedly installed on the inner top surface of the chassis; and a driving structure, which is arranged on the chassis and is used to drive the plastic parts to rotate. Compared with the prior art, the present application drives the rotating frame by a driving motor to realize the rotation of the rotating frame, thereby driving the clamping frame to revolve. At the same time, due to the meshing of the transmission gear and the fixed gear ring, the clamping frame can also realize self-rotation during the revolution. This combination of revolution and self-rotation ensures that the clamped plastic parts can be turned over in all directions and without dead angles, so that their outer walls can be fully irradiated. This rotation design not only improves the irradiation efficiency, but also ensures the uniformity of irradiation.

The invention provides a glass substrate harpoon type grinding workbench which comprises two racks, the two racks are symmetrically arranged, a mounting seat is fixedly mounted at the tops of the racks, a vacuum table is mounted at the top of the mounting seat, and the vacuum table comprises a vacuum box which is fixedly mounted at the top of the mounting seat and is provided with an opening in the top; the top of each vacuum box is fixedly provided with a box cover used for blocking the opening end of the vacuum box through a screw, supporting units are installed on the mounting base and located on the sides, close to each other, of the two vacuum boxes, and each supporting unit comprises a plurality of supporting rods fixedly installed on the mounting base in the length direction of the rack in a linear array mode. When the edge part of the substrate is processed, the transfer frequency of the substrate is reduced, the edge part of the substrate is convenient to grind and process, and the whole grinding and processing flow of the four sides of the substrate is simple and convenient, so that the processing time is shortened, and the processing efficiency is improved.

A station keeping waterfowl system includes at least one self propelled station keeping waterfowl decoy and a homing buoy each having water resistant housings, with at least a portion of the decoy housing having a form of a waterfowl. The decoy and buoy each include batteries, microprocessors, and power switches. The decoy includes a motor driven propeller, a motor driven rudder, and a receiving array of antennae for radio direction finding and radio ranging to the buoy. The receiving array is a T-array of antennae comprising a first transverse linear array and a second longitudinal linear array. The homing buoy emits a homing signal and the one or more waterfowl decoys autonomously navigate to remain within a predetermined radius around the buoy. The system includes a simple handheld controller which preferably comprises no more than two switches or buttons.

Base station antennas include a reflector, a first linear array of radiating elements extending forwardly from the reflector, the radiating elements in the first linear array configured to operate in a first frequency band, and a second linear array of radiating elements extending forwardly from the reflector, the radiating elements in the second linear array configured to operate in the first frequency band. These antennas further include an isolation wall that is positioned in between the first linear array of radiating elements and the second linear array of radiating elements. This isolation wall comprises at least one partially reflective surface that is configured to reflect, on average as a function of frequency, between 20% and 80% of incident radiation in the first frequency band.

The invention belongs to the technical field of wire harness conduction detection, and particularly relates to a wire harness conduction detection device comprising a detection platform; the multiple groups of detection mechanisms are distributed above the detection platform in a linear array mode, each group of detection mechanism comprises two mounting frames symmetrically arranged above the detection platform, and the two mounting frames are internally provided with test terminals communicated with the two ends of a wire respectively; and the multiple sets of self-adaptive clamping mechanisms are arranged, are used in cooperation with the mounting frames correspondingly and are used for conducting self-adaptive clamping and fixing on the wires according to the diameters of the wires. By arranging the self-adaptive clamping mechanism, the wire can be clamped and fixed in a self-adaptive manner according to the diameter of the wire, the fixing effect on the wires with different diameters in the wire harness is improved, the stability of wire connection is improved, and the influence on conduction detection of the wire is avoided.

The invention relates to the technical field of straw wood-plastic floors, in particular to a straw wood-plastic floor capable of preventing water accumulation and a preparation process thereof, the straw wood-plastic floor comprises a wood board main body, and further comprises a convex block fixed on one side of the wood board main body; the groove is fixed to the other side of the wood board body, and the protruding block is matched with the groove in a sliding mode; the plurality of lifting grooves are formed in the top of the wood board main body in a linear array; the multiple lifting assemblies are installed in the lifting grooves correspondingly and used for expanding and lifting when meeting water so that the lifting assemblies can be matched with the wood board body to form anti-skid teeth after being lifted, and the lifting assemblies are gradually reset after being dried; according to the device, through the arrangement of the lifting assembly, the lifting assembly can be automatically triggered when water is accumulated, so that the anti-skid effect of the wood board main body is enhanced under the action of the formed tooth shape, and potential safety hazards caused by slipping when people pass through are avoided.

An optical arrangement for a LIDAR system includes a laser, scanner, fold mirror, lens, and sensors. Adding a wedge-shaped optical element creates an auxiliary field of view, when positioned to overlie an edge portion of the lens. The wedge-shaped optical element may have a variable transparency preventing reception by the sensors of excessive signals from close targets. The sensors may be: a plurality of sensors with unique lengths / widths, arranged to form a linear array; or sensors with the same length / width, but positioned to form an arcuate shape, compensating for an arcuate scan line; or two columns of sensors, one with a field of view in focus at far field positions, and the other in focus at near field positions, correcting for parallax effect / error; or a column of highly sensitive sensors surrounded by a plurality of guard rail sensors having higher immunity to damage from stray laser light.

The invention discloses an array amplitude-phase error calibration method based on joint sparse estimation. The method comprises the following steps: setting a correction sound source to be positioned in an unknown far-field direction relative to a sensor linear array; the method comprises the following steps: dividing an observation area of a sensor linear array to obtain a plurality of grid points, correcting an array sampling signal based on the grid points and offset, constructing an array response signal model, and performing joint sparse direction-of-arrival estimation of the grid points and the offset to obtain a corrected sound source signal direction-of-arrival; the joint sparse estimation method for solving and correcting the direction of arrival of the sound source signal is popularized to a planar array and a multi-frequency cross array through iterative correction; and on the basis of the estimated corrected sound source direction of arrival, array amplitude-phase error calibration is completed by adopting a spatial filtering method. According to the method, the problem of beam pattern attenuation caused by existing array amplitude phase error calibration is solved, the error correction precision and correction efficiency are improved, and the application range of the error calibration method in multiple array types is widened.

The invention relates to a high-signal-to-noise-ratio ultrasonic imaging method and device for internal defects of a curved surface component, a medium and a product, and belongs to the technical field of ultrasonic imaging. According to the method, a linear array ultrasonic probe is adopted to carry out single-time ultrasonic excitation on a curved surface component, a full-matrix echo signal is obtained, first arrival time extraction is carried out on the collected signal, an ultrasonic incident angle is estimated, and discrete coordinates of the surface of the component are obtained; the method comprises the following steps of: fitting a curved surface model, constructing an equivalent virtual array model, calculating transmitting and receiving delay time of each pixel point, realizing initial full-focusing beam forming of signals, estimating an expected signal variance and a noise variance based on maximum likelihood estimation, constructing an initial coherent beam forming machine and performing iterative updating, and finally forming a beam. And taking the coherent beam synthesizer obtained by iteration as a weighting factor, acting on an initial beam synthesis signal for weighting, and completing image reconstruction. The method has the advantages of being high in calculation efficiency, low in system overhead, high in imaging signal-to-noise ratio and the like, and accurate imaging can be achieved in a curved surface structure scene.

A flexible weight that can be secured to a wearer during performance of an exercise. The weight is segmented, with each segment from a set of segments including an associated bolster-shaped unit having a plurality of pellets suspended in a cured gel, the pellets / gel being positioned within a casing. The set of segments is contained within an outer pouch that is substantially conformal with the set of segments, and the segments from the set of segments are arranged in a linear array. The weight also includes an endcap with a colored light indicator and electronics for communicating with a smart mirror.

The invention discloses a super-condensation composite brightness enhancement film and a liquid crystal display backlight module, and particularly relates to the technical field of brightness enhancement films.The super-condensation composite brightness enhancement film comprises a core layer, an upper-layer brightness enhancement structure and a lower-layer brightness enhancement structure, the core layer is a multi-layer film made of poly (ethylene naphthalate) and a copolymer thereof, the upper-layer brightness enhancement structure is fixed to the top of the core layer, and the lower-layer brightness enhancement structure is fixed to the bottom of the core layer; the upper-layer brightening structure comprises a plurality of light gathering blocks, the light gathering blocks are distributed on the top of the core layer in a linear array mode, the light gathering blocks are arranged to be in a trapezoid quadrangular prism shape or a hexagonal pyramid shape, and the lower-layer brightening structure is fixed to the bottom of the core layer. The large-angle light of the incident surface is subjected to primary convergence through the plurality of inverse prism structures at the bottom of the core layer, and the large-angle light of the emergent surface is subjected to secondary convergence through the plurality of concave trapezoidal quadrangular prism-shaped or hexagonal pyramid-shaped light condensation blocks at the top of the core layer, so that the light loss is reduced, and the brightness of the backlight center is improved; and the hexagonal pyramid-shaped light condensation block can also improve the uniformity of the visual angle.

Wake-word processing by a wearable electronic device could be carried out when the device is worn by a user and is in a device sleep state, the device including a linear microphone array having at least two microphones vertically spaced from each other, and the device also including a processor. And the example method could involve (i) the at least two microphones of the linear microphone array receiving an audio waveform representing a wake-word utterance, (ii) the processor making a determination, based at least on an angle of arrival of the audio waveform at the at least two microphones of the linear microphone array and / or an energy level of the audio waveform received at the at least two microphones of the linear array, of whether to accept the wake-word utterance or rather to reject the wake-word utterance, and (iii) the processor controlling operation of the device based on the determination.

The invention relates to the technical field of engineering structure vibration reduction, in particular to a pressure-resistant and low-frequency vibration reduction light sandwich cylindrical shell structure which is obtained by a unit cell circumferential array and a linear array. Each unit cell comprises an inner panel, an outer panel and a grid interlayer, and the inner panel, the outer panel and the grid interlayer are made of the same material. The Archimedes spiral resonance groove is accurately engraved in the inner panel, so that the local resonance effect is excited, and effective vibration attenuation is achieved. The structure has the characteristics of integration of light weight, vibration reduction and noise reduction functions, wide vibration reduction frequency range, good hydrostatic pressure resistance, easiness in manufacturing and the like. And meanwhile, certain sound absorption performance can be realized without changing external geometric characteristics of the structure and adding extra materials.

The invention discloses a high-performance concrete anti-permeability performance detection device, and belongs to the technical field of building detection, the high-performance concrete anti-permeability performance detection device comprises an operation table, a test mold, demonstration concrete and an inner layer detection mechanism, the test mold is arranged above the operation table, the demonstration concrete is arranged on the inner side of the test mold, and the demonstration concrete comprises a concrete pile; a test hole is formed in the center of the concrete pile in a penetrating mode, the inner layer detection mechanism is arranged on the inner side of the test hole and comprises a sealing cylinder and a detection cylinder, the detection cylinder is arranged on the inner side of the sealing cylinder, a sealing air bag is arranged on the side wall of the sealing cylinder, and detection bins are arranged in the detection cylinder in a linear array mode; and water-absorbent resin particles which swell when encountering water are quantitatively arranged in the detection bin. Compared with a traditional concrete impermeability detection device, the concrete impermeability detection device has the advantages that the test mold can be automatically locked, manual tightening and fixing are not needed, the permeation condition in the concrete can be visually detected, and the impermeability of the concrete can be more accurately detected.

Disclosed is a linear array scanning Brillouin scattering elastic imaging device. In the device, a signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective. A signal receiving system consists of a microscope objective, a quarter-wave plate, a polarization beam splitter and an eight-channel optical collimator array. Each channel of an eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card.

The utility model relates to the technical field of stair manufacturing, in particular to a mould for a concrete prefabricated stair. Comprising a first template body, a second template body is arranged on one side of the first template body, lock catches are symmetrically and fixedly connected to the two sides of the second template body, the second template body and the first template body are clamped and fixed through the lock catches, two partition plates are arranged in the first template body, and the two sides of each partition plate make contact with the inner wall of the first template body and the inner wall of the second template body respectively. Inserting rods are fixedly connected to the positions, close to the upper ends, of the two sides of the partition plate, and a plurality of inserting grooves are formed in the tops of the first template and the second template in a linear array mode. After the distance between the two partition plates is adjusted, the two partition plates are installed between the first formwork and the second formwork, a small pouring cavity is formed among the two partition plates, the inner wall of the first formwork and the inner wall of the second formwork, concrete is poured into the small pouring cavity, a stair with the specified length and width can be manufactured, and use is convenient.

The invention belongs to the technical field of heat exchange of electronic equipment, and discloses a manifold micro-channel type radiator and a heat dissipation method.The manifold micro-channel type radiator comprises a plurality of radiator modules arranged in a linear array, and each radiator module comprises two symmetrically-arranged heat dissipation units; the heat dissipation unit comprises a manifold distributor and a micro-channel; a cold side manifold channel and a hot side manifold channel are processed on the manifold distributor; the cold side manifold channel is of a channel structure which is reduced in the flowing-in direction of a coolant, and the hot side manifold channel is a uniform-section channel; the width of the hot side manifold channel is greater than the width of the inlet end of the cold side manifold channel; the micro-channel comprises a micro-channel substrate and a micro-channel main body arranged on the micro-channel substrate; the micro-channel main body comprises a cold side micro-channel area and a hot side micro-channel area; the hot side micro-channel area comprises a plurality of hot side micro-channels which are arranged in parallel, and each hot side micro-channel is provided with a plurality of pin fins which are linearly distributed; the purpose of effectively utilizing the cooling potential of the hot side manifold channel is achieved.

The invention relates to the field of underwater sound signal processing, in particular to an underwater DOA (direction of arrival) estimation method based on graph nerves and a convolutional neural network, which comprises the following steps: 1, establishing a linear array, and enabling narrow-band signals to simultaneously reach an underwater sound array; 2, performing signal preprocessing to obtain a signal covariance matrix, and performing normalization processing; 3, extracting correlation between array elements and spatial features of array signals, and performing data supplementation on sparse linear array information; 4, forming a double-branch structure, enhancing the information aggregation capability, and extracting features from a space path and a time domain path; and 5, constructing an adjacent matrix, filling node features of damaged array elements, adopting a double-branch structure, extracting spatial features and time domain features, carrying out feature integration, and outputting a DOA estimation result. The spatial correlation between array elements is extracted and the array sparsity problem is processed by using the graph neural network, and the time domain features of the signals are extracted in combination with the convolutional neural network, so that more accurate and more robust DOA estimation can be realized under the conditions of low signal-to-noise ratio and array sparsity.

The invention discloses a microneedle application packaged by liquid metal, and relates to the technical field of microneedle application, the microneedle application comprises gauze, the microneedle application further comprises a first application and a second application, the first application and the second application are the same in structure and are arranged on the two sides of the gauze, and the first application comprises a pressing part and an attaching part; the microneedles are arranged below the attaching piece in a linear array mode, the interiors of the microneedles are of hollow structures, and the inclination direction of the microneedles located in the first application body is opposite to the inclination direction of the second application body. The microneedles of the two microneedle application bodies are arranged to be inclined, the inclination directions of the microneedles of the two microneedle application bodies are opposite, so that a structure similar to a clamping jaw is formed, the attaching strength of the application body and the skin of a patient is improved, meanwhile, liquid metal is added into the microneedle application bodies and powered on, an electric field is formed at the wound of the patient, and the wound of the patient is wound. Therefore, continuous electrical stimulation is performed on the wound, and wound healing is actively promoted.

The invention provides an automatic container loading and unloading system and method, and mainly relates to the field of automatic loading and unloading. An automatic container loading and unloading system comprises an AGV body and a telescopic conveying belt, an adjusting unit is arranged on the front side of the AGV body, and an action unit with a visual recognition system is arranged at the top of the AGV body. The adjusting unit comprises a reversing mechanism, a conveying mechanism and a positioning mechanism, the action unit comprises a longitudinal displacement mechanism, a transverse displacement mechanism, a lifting mechanism and a grabbing mechanism, the grabbing mechanism is a suction cup set arranged in a linear array mode, and the coverage range of the suction cup set is half of the width of a container. The semi-row goods grabbing device has the beneficial effects that semi-row goods can be grabbed at a time, so that synchronous stacking or unstacking of the semi-row goods is conducted at a time through the action unit, the tedious steps of repeated action are reduced by multiple times, and the stacking efficiency is greatly improved.

The invention discloses a robust incoherent distribution source two-dimensional arrival angle estimation method under an L-shaped array, which comprises the following steps of: establishing a generalized array flow pattern receiving model under the L-shaped array, and the L-shaped array consists of two uniform linear arrays which are respectively positioned on an x axis and a z axis of an xoz plane; sampling data output by the uniform linear arrays on the x axis and the z axis at N moments; constructing aperture expansion array cross covariance vectors corresponding to the uniform linear arrays on the x axis and the z axis by using statistical average operation and a conjugate symmetry strategy; according to the cross covariance vector of the two aperture expansion arrays, all direction angle estimated values taking the x axis as the reference and all direction angle estimated values taking the z axis as the reference are obtained, and all two-dimensional arrival angle estimated values are obtained through pairing; the method has the advantages that the method is not only suitable for uniform and non-uniform noise scenes, but also does not depend on prior information of the number of signal sources, and the practicability and flexibility of the algorithm are improved.