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138results about How to "Reduce boundary effects" patented technology
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Stereoprojection system
InactiveUS20090102915A1Add depthReduces pushing border effectMirrorsProjectorsMonitoring systemProjection system
The invention relates to stereo projection systems for displaying stereopaired images on mirror-spherical or parabolic screens and for collectively watching a stereo effect without using stereo spectacles. Said invention makes it possible to continuously dynamically superimpose the projections of the left and right picture frames of a steropair with the user's left and right eyes, respectively. Such impositions are carried out simultaneously and independently for each viewer. The technical result is attainable by that the inventive stereo projection system comprises stereo projectors which are individually allocated to each viewer and in-series connected, a monitoring system for continuously and accurately determining the viewers' eye positions, a self correcting device, video-correcting devices, automatic drives for the mechanical self-correction of the stereo projectors and the system optical elements, units which are used for forming stereopair projected images in the stereo projector and which are coupled with the video-correcting device for the video-correction of the optimal parameters of the screen images. The inventive system makes it possible to carry out the self- and video-correction in an integral manner in such a way that the comfort of the stereo effect viewing is maximally satisfied.
Owner:ARSENICH SVYATOSLAV IVANOVICH
Time domain dynamic characteristic analysis-based intra-vehicle sound quality prediction method
InactiveCN105021275AFeature reservedReduce boundary effectsSubsonic/sonic/ultrasonic wave measurementTime domainAnalysis study
The invention belongs to the technical field of sound quality prediction in vehicle vibration and noise analysis and control and relates to a time domain dynamic characteristic analysis-based intra-vehicle sound quality prediction method. With the method adopted, the problem of incapability of current intra-vehicle sound quality analysis researches to describe the time domain dynamic characteristics of intra-vehicle sound environment in vehicle regular driving can be solved. The method includes the following steps that: 1, a sound acquisition device is utilized to acquire an intra-vehicle sound signal sample; 2, framing and windowing processing is performed on the intra-vehicle sound signal sample; 3, a subjective evaluation test is performed on the intra-vehicle sound signal sample; 4, sound quality objective psychological acoustic parameters are calculated; 5, the time domain dynamic characteristic indexes of the objective psychological acoustic parameters are calculated, wherein the indexes include the variances of the objective psychological acoustic parameters and the ranges of the objective psychological acoustic parameters; 6, an intra-vehicle sound quality objective comprehensive evaluation model is established; 7, the output value of the sound quality objective comprehensive evaluation model is compared with a subjective evaluation value; and 8, a test sample is utilized to verify the model.
Owner:JILIN UNIV
Three-directional static and dynamic loading model test platform for deep water foundations of bridges
ActiveCN103510551ASolve the technical problem of vertical loading influenceSmall sizeFoundation testingHorizontal forceTower
The invention discloses a three-directional static and dynamic loading model test platform for deep water foundations of bridges. The three-directional static and dynamic loading model test platform comprises a test foundation trench, a vertical loading system, a horizontal bi-directional loading system and a water level simulating system. The test foundation trench is used for arrangement of foundation soil, water and models. The vertical loading system used for applying vertical static and dynamic action on the models is installed at the top of the test foundation trench, the horizontal bi-directional loading system used for applying two or more horizontal static and dynamic actions on each model is installed on the upper portion of the inner side wall of the test foundation trench, and the water level simulating system used for water feeding and draining and test water level control in the test foundation trench is installed on the bottom and the outer side of the outer side wall of the test foundation trench. Test and research on the models of bridge deep water foundations such grouped piles, sink shafts, caissons and compound foundations and bridge towers (piles) under three-directional static and dynamic actions such as the vertical static and dynamic action and the horizontal bi-directional static and dynamic action can be carried out by the test platform, and the test platform solves problems about simulation of static and dynamic mutual action of the foundation soil-water-bridge deep water foundation-bridge tower (pile) under the combined working conditions of vertical force, horizontal force, bending moment, torque and the like.
Owner:CCCC HIGHWAY BRIDNAT ENG RES CENT
Foundation base model test device capable of bidirectional loading
The invention discloses a foundation base model test device capable of bidirectional loading. A force-bearing framework is a rectangular steel frame, a model slot is of a rectangular steel structure, is provided with an upper opening and is formed by welding of a box template, the force-bearing framework is sleeved at the periphery of the model slot, a horizontal actuator counterforce column is vertically erected on the left end part of the model slot, the left end of the horizontal actuator is connected with the horizontal actuator counterforce column, the right end of the horizontal actuator is connected with the top of a pile, the upper end of a vertical actuator is connected with a cross beam at the upper part of the force-bearing framework, the lower end of the vertical actuator is connected with the top of the pile through a vertical dowel steel, a row of drain valves are arranged at the lower part of the left side wall of the model slot, an inlet valve is arranged at the lower part of the right side wall of the model slot, and a water supply pipe of the inlet valve is connected with a constant-pressure water tank. Monitoring is systematic and comprehensive, embedding of monitoring instruments is relatively easy, and automatic and real-time monitoring on multiple physical quantities can be realized. The foundation base model test device disclosed by the invention can be used in conducting model tests like slope foundation, composite foundation and pile foundation.
Owner:HUBEI ELECTRIC ENG CORP +1
Integral permeability testing machine for self circulation measuring for perpendicular and horizontal permeability coefficient
InactiveCN101285754AFast deliveryPrecise deliveryTextile testingPermeability/surface area analysisGraduated cylinderPermeability coefficient
The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with a barometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of the vertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.
Owner:ZHEJIANG UNIV
Method for inverting near-surface velocity model by utilizing preliminary waveforms
The invention discloses a method for inverting a near-surface velocity model by utilizing preliminary waveforms. The method comprises acoustic wave equation-based wave field forward modeling and steepest descent-based waveform inversion technologies, and comprises the following steps of 1, extracting time-domain preliminary waveform records and an initial model; 2, calculating a simulated wave field and a wave field residual by utilizing acoustic wave equation staggered grid finite-difference forward modeling simulation; 3, reversely propagating the wave field residual to obtain a retransmission wave field; 4, calculating a gradient of a target function by utilizing the retransmission wave field and a forward propagation wave field, and calculating an updating step length; 5, updating a speed model; 6, inspecting whether the speed model is consistent with an iteration stopping condition, outputting the speed model if the speed model is consistent with the iteration stopping condition, otherwise returning to the step 2, and continuing iterative updating. According to the method, a wave equation theory-based full-waveform inversion technology is used as reference, and preliminary waves with higher energy and more stable waveforms are used for inversion, so that the multiplicity of solutions of full-waveform inversion is reduced, and the inversion stability and the calculation efficiency are improved; the accuracy of static correction and shallow depth imaging is improved.
Owner:中国石油集团西北地质研究所有限公司
Strength testing device and testing method for fuselage wall plate under action of combined loads
ActiveCN103149075AReduce boundary effectsUniform shear loadMaterial strength using tensile/compressive forcesMaterial strength using steady shearing forcesInternal pressureKeel
The invention belongs to a strength testing device and a testing method for a fuselage wall plate under the action of combined loads. The strength testing device for the fuselage wall plate under the action of the combined loads comprises corner boxes, airtight end plates, the fuselage wall plate, a hinge, mandrils, keels and arc-shaped rubber plates, wherein the airtight end plates are arranged at two ends of the fuselage wall plate, the corner boxes are arc-shaped components and installed at a combined part between the airtight end plates and the fuselage wall plate, the keels are arc-shaped frames, the keels are connected in a pasting mode through the arch-shaped rubber plates to form a keel group, the mandrils are installed on web plates at two ends of the keel group, and the hinge is arranged on the fuselage wall plate and the keel group and achieves hinged connection of the fuselage wall plate and the keel group. According to the strength testing device and the testing method for the fuselage wall plate under the action of the combined loads, boundary conditions of the fuselage wall plate can be effectively imitated, the combined loads are conveniently used for achieving a strength test, and due to the fact that drawing loads and compressing loads are not used at the same time, the applied combined loads are one kind of or two kinds of or three kinds of internal pressure loads, drawing loads (or compressing loads) and shear loads.
Owner:CHINA AIRPLANT STRENGTH RES INST
Monitoring system for migration of elements of nitrogen, phosphorus and the like in hydrologic cycle process of farmland soil
InactiveCN103558361AMake up for migration issuesShorten the test cycleEarth material testingEngineeringHolding tank
The invention discloses a monitoring system for the migration of elements of nitrogen, phosphorus and the like in the hydrologic cycle process of farmland soil. The monitoring system is provided with a water supplying system, a soil holding pool, a water head and water level control system, a soil solution collector, a bottom frame and a slope regulator, wherein a water inlet pool and a water outlet pool of the water head and water level control system are respectively arranged near two wide side walls of the soil holding pool and share the side walls together with the soil holding pool, holes are respectively formed in the shared side walls, water level / water head control holes are respectively formed in the outer side walls of the water inlet pool and the water outlet pool, baffle plates are respectively arranged on the outer side walls of the water inlet pool and the water outlet pool, a nozzle of the water supplying system is positioned above the soil holding pool, collecting tanks of the soil solution collector are embedded in soil in the soil holding tank, and head sections and tail sections of the two adjacent collecting tanks in each line are positioned in the same plane, the soil holding pool, the water inlet pool and the water outlet pool are integrally placed on the bottom frame, and the slope regulator is arranged under the bottom frame. According to the monitoring system, the elements of the nitrogen the phosphorus and the like in the vertical infiltration process of soil water in different soil layers can be monitored, and the elements of the nitrogen, the phosphorus and the like in a shallow groundwater flowing process can be monitored.
Owner:INST OF AGRI ENVIRONMENT & RESOURCES YUNNAN ACAD OF AGRI SCI
Simulated large-field soil and solute transporting system
InactiveCN102608291AShorten the test cycleReduce boundary effectsEarth material testingWater contentCollection system
The invention relates to a large-field soil and solute transporting system and discloses a simulated system for researching leaching, migration and transformation conditions of solutes in the soil under a field irrigation condition. The system comprises a soil groove, a water supply system, a sampling system, a data collecting system and a leaching solution collecting system, wherein the inner wall and the bottom part of the soil tank are provided with waterproof layers and the soil is filled into the soil tank; the water supply system is used for supplying water to the soil tank; the sampling system is used for sampling a solution contained in the soil of the soil tank; the data collecting system is used for monitoring the water content in the soil with the different depths in the soil tank at regular time; and the leaching solution collecting system is used for collecting a leaching solution at the bottom of the soil tank. The system disclosed by the invention can be used for monitoring the leaching, migration and transformation conditions of the solutes in the soil under the field irrigation condition one by one, so that the test period is shortened, the boundary effect is reduced and the test precision is improved; and furthermore, the problems that the indoor evaporation amount is small and does not accord with field conditions are solved by using an evaporation system.
Owner:CHINA AGRI UNIV
Step type variable speed scanning method for accuracy control of laser bend forming
InactiveCN101804508AAchieve bendingReduce boundary effectsLaser beam welding apparatusNumerical controlLaser coating
A step type variable speed scanning method for accuracy control of laser bend forming belongs to the technical field of plastic forming. A laser coating material is coated on the scanning area of a surface to be scanned, a sheet material to be detected is clamped on one side, the scanning speed of the scanning area is determined by the diagram method to generate the step type variable speed scanning scheme corresponding to the scanning area, and finally the sheet material to be detected is scanned and processed according to the step type variable speed scanning scheme in a laser numerical control manner. The measure and check after processing are performed after the sheet material is cooled naturally. The method of the invention can effectively reduce the phenomenon of border effect, enhance the forming accuracy of the sheet material, thereby realizing the different energy output of the different heating area to balance the geometric constraint of the sheet material and improve the border effect.
Owner:SHANGHAI JIAO TONG UNIV
Method for simulating soil slope instability induced by groundwater
InactiveCN108828189AShorten test timeImprove test efficiencyEarth material testingPhysical modelInstability
The invention discloses a method for simulating soil slope instability induced by groundwater. The method is characterized by comprising the following steps: a, putting a physical model on a centrifugal machine; b, raising the height of an external water tank, opening a water outlet valve and a water inlet valve, carrying out water seepage into a soil layer according to the thickness of a saturated soil layer and completing the saturation process of a soil mass; c, closing the water inlet valve, reducing the height of the external water tank, improving the centrifugal acceleration to solidifyand disperse the internal pore water pressure of the physical model; d, after the solidification is finished, opening the water inlet valve, raising the height of the external water tank to the corresponding height according to the preset water level height of an internal water tank; obtaining different infiltration capacity of the water to the slope when the water in the internal water tank seepsinto the soil layer and stays at different heights, and observing the wetting front change and the slope deformation condition of the physical model. The method disclosed by the invention has the advantages that the height of the groundwater level can be accurately adjusted in real time and washing of water current to the slope body is prevented; in the whole test process, high operability, highreliability and good test effect are realized.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Multi-scene target tracking method based on adaptive depth feature filter
ActiveCN110135500AEasy to handleImprove pollutionCharacter and pattern recognitionPattern recognitionCorrelation filter
The invention discloses a multi-scene target tracking method based on an adaptive depth feature filter. The method comprises the following steps of converting a target area of an original image into acolor naming space from an RGB space to reduce the interference of color changes, then, calculating a foreground probability graph of a target area, t and training by using the features extracted from the foreground area according to the foreground probability graph to alleviate the boundary effect and effectively inhibit the noise in the background, so that the method can adaptively extract thetarget features. According to the method, multiple layers of depth features are used for training in corresponding related filters respectively; and the weight of the corresponding depth feature filter is updated adaptively according to the tracking effect, the filter stability, the historical response and other information, and the tracking model is guided to adaptively select useful depth features in different scenes, so that the target can be tracked in a robust manner in various complex scenes. Compared with the prior art, the method has the advantage of high robustness, and can accurately track the target in various complex scenes.
Owner:NANJING UNIV
High accurate subspace extension of phase correlation for global motion estimation
InactiveUS20080212687A1High sub-unit accuracyReduce boundary effectsImage enhancementTelevision system detailsPhase correlationNear neighbor
A method for achieving high sub-unit accuracy during global motion estimation of sequential video frame images is described herein. The method estimates the global motion using an existing phase-correlation approach, and further refines it to a sub-unit level using the neighborhood values of the phase correlation surface peak The method determines the sub-unit displacement direction by examining the signs of the peak of phase correlation surface and its two nearest neighbors. The method determines the sub-unit displacement magnitude by applying the ratio of associated phase correlation values to a 5th-order polynomial function. The method then computes the actual motion by adding the sub-unit displacement value to the global motion value as calculated by the phase-correlation approach.
Owner:SONY CORP +1
Laminar shear box device for supergravity-field vibration table test
InactiveCN102323138AKeep watertightReduce boundary effectsMaterial strength using repeated/pulsating forcesEngineeringSupergravity
The invention discloses a laminar shear box device for a supergravity-field vibration table test. A main body is a shear box formed by laminating 20 layers of rectangular aluminum alloy frames of equal thicknesses; the layers are connected with one another through a rolling shaft; horizontal displacement sensors are arranged on the upper 19 layers through bolts; the periphery of a shear frame is provided with a rigid support frame, which comprises a displacement sensor fixture, a guide post and a static post; the guide post and a top plate are provided with frame guide wheels; a rubber film is arranged on the inner side of the shear box; a drainage system is arranged in a bottom plate of the shear box; and the bottom plate is fixed on a vibration table during testing. In the invention, the behavior of a semi-infinite site soil body can be simulated through a model of a definite size. The laminar shear box device has the characteristics of simple structure and convenience for installing and applying.
Owner:ZHEJIANG UNIV
Wide-area salient object detection architecture for low power hardware platforms
Described is a system for detecting multiple salient objects in an image using low power hardware. From consecutive pair of image frames of a set of input image frames, image channels are generated. The image channels are resized into multiple image scales that specify a relative size of a salient object in the image frames. A patch-based spectral transform is applied to overlapping image patches in the resized image channel, generating salient patches. Saliency patches are combined into a saliency map for each resized image channel, resulting in multiple saliency maps. The saliency maps are combined into an aggregate saliency map. An adaptive threshold is applied to the aggregate saliency map to determine which pixels in the aggregate saliency map correspond to a detected salient object region including a salient object. An object bounding box is generated for each salient object and output to a display.
Owner:HRL LAB
MRI image inhomogeneity correction method based on regularization
ActiveCN103632345AReduce boundary effectsPrevent overfittingImage enhancementBoundary effectsInhomogeneous field
The invention provides an MRI image inhomogeneity correction method based on regularization. A lowpass filtering method is improved, part of an area with low grey-value difference is selected and is subjected to lowpass filtering to obtain an initial estimate for a inhomogeneous field, and then extrapolation is performed through a regularized polynomial fitting method to obtain an estimate for an inhomogeneous field of a whole image. According to the method provided by the invention, an area-of-interest is determined and is subjected to filtering, so the boundary effect in the global image filtering method can be avoided, and fitting is performed through a regularization method, thus overfitting is guaranteed not to happen under the condition of improving the fitting order.
Owner:UNIV OF SCI & TECH OF CHINA
Recursive cosine transform method for plane geomagnetic anomalous field one-step upward continuation plane modulus gradient field
ActiveCN107291659AHigh precisionReduce boundary effectsComplex mathematical operationsContinuationEdge effects
The invention provides a recursive cosine transform method for plane geomagnetic anomalous field one-step upward continuation plane modulus gradient field. Plane geomagnetic anomalous field measurement data is preprocessed; the geomagnetic anomalous field measurement data irregularly and discretely distributed on an observation plane is gridded through utilization of a radial primary function interpolation method, thereby obtaining gridded geomagnetic anomalous measurement data; the gridded geomagnetic anomalous measurement data is transformed into cosine transform wave spectrums through utilization of recursive cosine transform; the wave spectrum of each component of a geomagnetic modulus gradient field is calculated according to the geomagnetic cosine transform wave spectrums through utilization of a one-step wave number domain transform factor; and recursive inverse cosine transform of line direction phase shift Pi / 2 is carried out on the wave spectrums of a horizontal x component, a horizontal y component and a vertical z component, thereby obtaining the components of the geomagnetic modulus gradient field on a continuation plane. According to the one-step method provided by the invention, the calculation quantity is half of the calculation quantity of a two-step method; through utilization of the cosine transform method, the Gibbs edge effect is reduced, and algorithm precision is improved; and the method can be applied to a data sequence with any length.
Owner:HARBIN ENG UNIV
Instantaneous frequency extraction method of Doppler signals
InactiveCN106054159AHigh precisionReal-time measurementFluid speed measurementElectromagnetic wave reradiationVanishing momentsDecomposition
The present invention relates to an instantaneous frequency extraction method of Doppler signals, and belongs to the signal processing technology field. According to the present invention, for the Doppler signals outputted by various interference velocimeters, firstly the appropriate parameters, such as the wavelet, the threshold type, the decomposition layer number, the vanishing moment, etc., are selected to carry out the wavelet de-noising on the output signals to smooth the edges; after then the amplitude modulation-frequency modulation decomposition is carried out on the de-noised signals in an iteration manner, and the envelopes of the signals are extracted and are normalized; and finally, the instantaneous frequencies of the normalized signals are extracted by a direct orthogonal method, and an estimation curve of the instantaneous frequencies is obtained in a least-square fitting manner. According to the present invention, firstly the signals are de-noised, so that the direct orthogonal method which is more sensitive to the noise originally can be applied to the Doppler signals, and the simulation results show that on the condition of selecting the appropriate parameters, an error of an instantaneous frequency value obtained by the present invention and a theoretical value is less than 0.5%, the calculation time and the sampling point number are positively related, and the calculation velocity is faster.
Owner:盛思(河南)仪器科技有限公司
Method for extracting geoscience spatial information based on generalized self-similarity principle
InactiveCN101504659AGreat practicabilityImprove extraction accuracyComplex mathematical operationsICT adaptationResource assessmentBoundary effects
The invention relates to a method for extracting topographical spatial information based on a generalized self-similarity principle, which comprises: transforming the topographical spatial information into an energy spectral density space by Fourier transformation; eliminating the influence of boundary effect generated by the topographical data boundary part; drawing a double logarithmic scatter graph formed by the energy spectral density value (S) and the area (A) included by the isometric line of the energy spectral density value (S), and detecting the fractal rules of the energy spectral density and the area; determining the number and the interval of generalized self-similarity relations; determining the threshold and a corresponding fractal filter; and transforming filtered energy spectrum information back to a spatial domain by inverse Fourier transformation, and achieving the aims of decomposing anomaly and ambient fields and extracting interested topographical spatial information. The method has the advantages of wide practicality, high extraction precision and the like, and is suitable for topographical data such as geological data, mineral data, geochemical data, geophysical data, remote sensing data and the like, and the operations of topographical information extraction and topographical data mining such as mineral exploration, resource assessment, environmental pollution assessment, natural disaster analysis, marine vortex extraction and the like.
Owner:成秋明 +3
Method and apparatus for correcting audio signal
InactiveCN101373594AReduce discontinuityDiscontinuity hasSpeech analysisCode conversionFrequency spectrumBoundary effects
The invention belongs to the technical field of communication, and discloses a method and a device for correcting audio signals. The method comprises the following steps: intercepting a segment of signal near the boundary of an audio signal data frame; subjecting the intercepted signal to linear treatment to obtain a new signal; and calculating the evaluation index of the new signal and, if the evaluation index is smaller than a preset evaluation index, continuing the linear treatment until the evaluation index of the signal after the linear treatment is larger than or equal to the preset evaluation index. The method has the advantages that the method has less calculation amount, can achieve smooth and periodic time domain waveforms of the audio signal by correcting the audio signal, and can ensure the phase information of the signal and reduce frequency spectrum divergence, thereby achieving smooth frequency spectrum and further eliminating boundary effect.
Owner:HUAWEI TECH CO LTD
Satellite video dynamic target tracking method fusing correlation filter and motion estimation
ActiveCN110956653AAccurate satellite video dynamic target trackingImprove accuracyImage enhancementImage analysisImaging FeatureKalman filter
The invention discloses a satellite video dynamic target tracking method fusing a correlation filter and motion estimation, and relates to the field of spaceflight earth observation information processing and analysis. The satellite video dynamic target tracking method comprises the steps: obtaining a satellite video, and segmenting the satellite video into continuous single-frame images; selecting a to-be-tracked target from the single-frame image, constructing image features of the target, and inputting the image features into a related filter to obtain the position of the target; performingmotion estimation processing on the position of the target through a trajectory average algorithm and a Kalman filter, and when the Kalman filter is not stable, taking the processing result of the trajectory average algorithm as a motion estimation result; and when the Kalman filter is stable, taking a processing result of the Kalman filter as a motion estimation result. The satellite video dynamic target tracking method is suitable for satellite video ground target tracking, especially when the target is shielded, can still effectively track the target, and can complete multiple applicationssuch as target high-precision tracking, sensitive target real-time positioning and traffic flow monitoring.
Owner:TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
Circuits for biasing/charging high impedance loads
InactiveUS20100166227A1Fast chargingOutput terminal be lowBatteries circuit arrangementsSemiconductor electrostatic transducersShunt DeviceReverse current
A charging circuit for charging / biasing high impedance loads such as capacitive loads. The circuit comprises an input for connecting to a voltage / charge source and an output for connecting to the load. A capacitor is connected between the output and a reference voltage such as ground and a reverse bias diode is connected between the input and the output terminals. The reverse bias diode is arranged to allow a reverse current to pass which is sufficient to compensate for current leakage at the output terminal or other parts of the circuit. The reverse bias diode is conveniently a polysilicon diode. The diode may be connected in parallel with a shunt device to allow for rapid charging during start up.
Owner:WOLFSON MICROELECTRONICS LTD
Modeling method of surface fold morphology of square solar sail
ActiveCN105975649AReduce boundary effectsUniversalGeometric CADSpecial data processing applicationsModel methodRelational model
The invention discloses a modeling method of the surface fold morphology of a square solar sail. The modeling method comprises the following steps: firstly, aiming at a square film solar sail structure, determining a stress field distribution cloud picture of the square film solar sail structure so as to obtain a fold area; and secondly, putting forward a new fold morphology description equation, and establishing a fold morphology model which is closer to practical situations by introducing an exponential decay function. The method utilizes an Airy stress field distribution theory, eliminates boundary influence through a stress superposition rule, and obtains the stress filed distribution cloud picture of the film solar sail structure so as to further determine the fold area. On the basis, a more accurate fold morphology description equation is put forward, the generalized equation of a film fold parameter is established on the basis of a vonKarman large deflection equation, a stress extremum method is adopted to obtain a relational model of the fold morphology and fold direction tensile stress, the modeling method is simple in solving, and meanwhile, the obtained fold morphology is closer to the practical situations.
Owner:XIDIAN UNIV
Physical model for simulating soil slope instability induced by groundwater
InactiveCN108828188AUniform penetration rateAvoid scourEarth material testingInstabilityPore water pressure
The invention discloses a physical model for simulating soil slope instability induced by groundwater and belongs to the field of physical model tests. The physical model comprises a model case and ischaracterized by further comprising an external water tank and a lifter, wherein a base is fixedly arranged on the inner bottom wall of the model case; an impervious layer is fixedly arranged on thebase; a soil layer is arranged on the impervious layer; a pore-water pressure sensor, a soil pressure sensor and a differential displacement sensor are arranged in the soil layer; an internal water tank is arranged on one side of the base; water level scales are etched on one side wall of the internal water tank; a plurality of water seeping holes are formed in the other side wall of the internalwater tank; porous stones and geotechnical cloth are sequentially arranged between the water seeping holes and the soil layer; a stainless steel hose is connected to the internal water tank; a water flow sensor is fixedly arranged on the stainless steel flexible hose. According to the physical model disclosed by the invention, underground water level height can be accurately adjusted in real time;in addition, the infiltration capacity of a slope body at certain water level height can be maintained, scouring to a soil model can be effectively avoided, and a good test effect is realized.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Protective cover based on double-sided explosive welding and charging structure
ActiveCN106735862AAvoid restrictionsImprove securityWelding/cutting auxillary devicesAuxillary welding devicesDetonationBoundary effects
The invention discloses a protective cover based on double-sided explosive welding and a charging structure. The protective cover can be repeatedly used and mainly comprises an outer shell, a buffer layer and a constraint net. The protective cover provides a closed environment for explosive welding, can effectively prevent an upper-layer composite plate and fragments from flying apart, reduces noise pollution and dust pollution and provides a safe and comfortable working environment for explosive machining. The charging structure comprises a constraint box, supporting shells and an explosive. The supporting shells are columnar shells shaped like the Arabic number '8' and evenly distributed along the inner surface of the constraint box, achieve a supporting effect, and enhance detonation at the boundary, thereby reducing the boundary effect. The upper surface and the lower surface of the charging structure are in fit with the upper-layer composite plate and a lower-layer composite plate, and the explosive is in a constraint state in any direction. Accordingly, the explosive detonation critical thickness is reduced, and the energy utilization rate is improved.
Owner:UNIV OF SCI & TECH OF CHINA
Real-time evaluation method of human body motion sequences
InactiveCN106021926AReduce boundary effectsAccurate keyframeInformaticsSpecial data processing applicationsHuman bodyBoundary effects
The invention relates to a real-time evaluation method of human body motion sequences. Boundary extension is carried out on the motion sequences by employing interpolating wavelet based on difference, thereby reducing boundary effect; a wavelet coefficient is calculated, thereby obtaining key frames; features of the motions are described through the key frames; the distance between two motion sequences is calculated by employing a DTW distance measurement function; finally the distance is normalized, thereby obtaining a similarity score of the two motions. The method has the advantages that the boundary effect is reduced by employing the interval interpolating wavelet, thereby obtaining the more accurate key frames, and further the more accurate motion evaluation is realized.
Owner:北京九艺同兴科技有限公司
Depth correlation target tracking algorithm based on mutual reinforcement and multi-attention mechanism learning
ActiveCN110120064AImprove robustnessIncrease effective distributionImage enhancementImage analysisMean squareFeature extraction
The invention discloses a depth correlation target tracking algorithm based on mutual reinforcement and multi-attention mechanism learning. The algorithm comprises the following steps: inputting a previous frame of target area and a next frame of search area; initializing parameters of the feature extractor, learning the parameters of the feature extractor through gradient descent through mean square error loss, and extracting features from the search area through the feature extractor; calculating autocorrelation of the features, and learning a filter template through a ridge regression closed solution; enabling the next frame to determine a search area through a target position speculated by the previous frame, carrying out feature extraction through a designed feature extractor, and calculating cross-correlation of features of the target area and the search area; carrying out related operation on the characteristics and a filter template, wherein the maximum value in the output values is the latest position of target tracking; and each frame learns and updates the target filter template.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Loose media permeation grouting simulation experiment method
ActiveCN108051351APressurized and stableLow costMaterial strength using tensile/compressive forcesPermeability/surface area analysisPermeation groutingHigh pressure
Owner:CHINA UNIV OF MINING & TECH
In vitro cell co-culturing double flow mechanical force loaded flow chamber apparatus
InactiveCN102229887ASimplified installation stepsKeep aliveTissue/virus culture apparatusGlass coverEngineering
The invention provides an in vitro cell co-culture double flow mechanical force loaded flow chamber apparatus which mainly comprises five parts: a screw cover plate, a glass cover plate, a flow chamber pedestal, left / right joints and a flow chamber co-culturing nested block. The screw cover plate is arranged on the glass cover plate to tightly press the glass cover plate. The glass cover plate is arranged above the flow chamber pedestal and sealed with an O-shaped ring to guarantee aseptic atmosphere in the chamber. The upper surface of the flow chamber pedestal is provided with an annular groove for the installation of the O-shaped ring; location holes are provided in the front and back interior walls of the flow chamber pedestal for the positioning of the co-culturing nested block; two sides of the pedestal are provided with fluid passages for communication with a perfusion system. The left / right joints are connected with the chamber through pipe threads. The upper part of the co-culturing nested block is provided with a slide glass embedding groove and a flow chamber groove for the placing of an upper slide glass, and the bottom of the co-culturing nested block is provided with a lower flow chamber groove for the placing of a lower slide glass. According to the invention, the flow chamber apparatus is connected with the perfusion system, cells are in the flow chamber, and released molecules vertically disperse in a nutrient solution and have a small diffusion distance, thereby realizing the purpose of co-culturing.
Owner:BEIHANG UNIV
Discrete element modeling and numerical simulation method for rock and earth mass triaxial test taking film effect
InactiveCN107330227AMeet the test conditionsFlat surfaceDesign optimisation/simulationSpecial data processing applicationsTriaxial shear testElement modeling
The invention discloses a discrete element modeling method for a rock and earth mass triaxial test taking film effect. The method includes following steps: S1, modeling a sample preparing container; S2, modeling a rock-earth mass sample; S3, endowing the generated rock-earth mass sample with material attribute of given sample units, balancing stress among the sample units to complete making of the rock-earth mass sample; S4, building an elastic film, replacing a rigid barrel of a sample preparing container model with the elastic film, setting corresponding material attribute for the elastic film to complete building of a triaxial test discrete element model. Further, the invention further discloses a numerical simulation method based on the discrete element model. According to given pressurizing conditions, stress loading is adopted to axially pressurize the rock-earth mass sample, and lateral confining pressure is applied on the rock-earth mass sample through water pressure. A film unit is adopted to simulate a latex film in the triaxial test, and flexible boundary of the latex film better conforms to actual circumstance of indoor triaxial test numerical simulation.
Owner:NANJING UNIV
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