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33 results about "Diffusion matrix" patented technology
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Matrix diffusion is very important in the context of a radioactive waste repository in that it provides a mechanism for greatly enlarging the volume of rock that is accessible from a flow path and thus increases the global pore volume, which can retard radionuclides by diffusion and sorption.
Porous Matrix Sound Suppressor
ActiveUS20150354422A1Reduce manufacturing costReducing the audible signatureExhaust apparatusSilencing apparatusCombustionSuppressor
Disclosed is a sound-suppressing device that employs a porous micro-channel diffusion matrix surrounding a hollow core tube that acts to exponentially increase the surface area of the suppressor and allow combustion gasses to diffuse and exit the suppressor across the entire outer surface of the suppressor.
Owner:EMPOREUM PLASTICS
Time-space adaptive processing method based on radar amplitude and Doppler frequency estimation
The invention discloses a time-space adaptive processing method based on radar amplitude and Doppler frequency estimation. The approach is as follows: determining an airborne radar which emits pulse signals and receives radar echo signals in a detection scope, obtaining an N*M*L-dimensional radar echo signal matrix through calculation, calculating a D*L-dimensional radar echo signal matrix P of power values at D Doppler channels corresponding to L distance units in N array elements, obtaining K targets, accordingly, obtaining a diffusion distance unit scope corresponding to power spectra of the K targets, initializing K, calculating an M*delta1k*C-dimensional radar echo signal estimation matrix Tk corresponding to delta1K diffusion distance units in a diffusion matrix unit diffusion scope Lk of the power spectrum of the k-th target, accordingly, calculating a power spectrum diffusion estimation matrix Tk<^> of the k-th target, adding one to k until the power spectrum diffusion estimation matrix Tk<^> of the k-th target is obtained, and then according to a scope from the obtained power spectrum diffusion estimation matrix T1<^> of the first target to the power spectrum diffusion estimation matrix Tk<^> of the k-th target, calculating a training sample F for time-space adaptive processing of the airborne radar.
Owner:XIDIAN UNIV
Method of improving the quality of a three-dimensional ultrasound doppler image
InactiveUS20060184021A1Quality improvementUltrasonic/sonic/infrasonic diagnosticsImage enhancementColor dopplerVoxel
The present invention relates to a method of improving a 3D ultrasound color Doppler image through a post-processing. A method of processing an ultrasound image, includes the following steps: a) recognizing a target object from an inputted ultrasound image based on an object recognition algorithm using connectivity of the target object; b) setting at least one object region by using the connectivity of the recognized target object; c) calculating a structure matrix by using voxel gradients of the object region; d) calculating a diffusion matrix from the structure matrix; and e) acquiring a processed ultrasound image by applying the diffusion matrix and the voxel gradients to the inputted ultrasound image.
Owner:KOREA ADVANCED INST OF SCI & TECH
Image compressed encryption method based on compressed sensing and Chua's circuit
InactiveCN108235029AResistance to Differential AttacksRandomDigital video signal modificationPattern recognitionImage compression
The invention discloses an image compressed encryption method based on compressed sensing and a Chua's circuit. The method comprises the following steps of 1, generating a key related to plaintext according to an original image by using SHA-256; 2, performing iteration on initial values x02 and a02 to generate a chaos sequence t' and t'', and generating measurement matrixes FORMULA and FORMULA through performing iteration on t' and t''; 3, measuring sub-bands LH, HH and HL by different compression ratios; 4, quantizing to acquire an integer sequence z, and forming a matrix z'; 5, acquiring a diffusion matrix f'; 6, acquiring a matrix LL', and performing an XOR operation on the diffusion matrix f'; and 7, combining four sub-bands such as LL, LH, HL and HH, and scrambling the chaos sequencegenerated by x04 and a04 to acquire a final compressed encryption image E. According to the method the data transmission quantity can be reduced, the robustness of the image can also be enhanced, thesecurity is high, and particularly, the method is good in performance when being used for resisting shearing attacks and noise attacks.
Owner:GUANGXI NORMAL UNIV
SAR image super-resolution method based on marginal information and deconvolution
ActiveCN103839238AIntegrity guaranteedPredictive directionalityImage enhancementFast Fourier transformMaximum a posteriori estimation
The invention provides an SAR image super-resolution method based on marginal information and deconvolution. The method achieves the aim that a low-resolution SAR image is reconstructed to be a high-resolution SAR image, and comprises the steps that the low-resolution SAR image is generated to be a result image on which super resolution is to be conducted; original SAR image pixel dot interlace evaluation is conducted; for each image pixel which is not evaluated, four image pixels are used for estimating the gray level distance, and calculating a standard deviation at the same time; the obtained gray level distance and the standard deviation are used for conducting estimation filling on the pixels which are not evaluated; the result image anticlockwise rotates by 45 degrees, and in the same way, the gray level distance is estimated, the standard deviation is calculated, and estimation filling is conducted on the pixels; then the result image anticlockwise rotates by 45 degrees, Gaussian point diffusion matrix deconvolution is conduced on the result image, and the super-resolution result image is obtained after Fourier transform is conducted on the image. According to the SAR image super-resolution method based on marginal information and deconvolution, marginal maximum a posteriori estimation is achieved, the integrality of the image content structure is ensured, fast Fourier transform deconvolution processing is adopted, and the blur caused by marginal interpolation is lowered.
Owner:XIDIAN UNIV
Porous matrix sound suppressor
ActiveUS9546838B2Reducing the audible signatureReduces the audible signatureWeapon componentsCombustionSuppressor
Owner:EMPOREUM PLASTICS
Method of encryption with dynamic diffusion and confusion layers
ActiveUS20170366339A1Multiple keys/algorithms usageEncryption apparatus with shift registers/memoriesPlaintextComputer hardware
A method of encrypting messages in clear with the aid of a secret key, the method of encryption implementing at least one substitution layer using a substitution table and a diffusion layer using a diffusion matrix, the substitution layer and / or the diffusion layer being configured in a dynamic manner by a control parameter obtained by combining the secret key with the output word from a counter and by performing a non-invertible transformation on the combination. The counter is incremented at least once between two successive plaintext messages. The configuration of the substitution layer is manifested by an identical permutation of bits of each element of the substitution table and the configuration of the diffusion layer is manifested by a permutation of the elements of the diffusion matrix.
Owner:COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Safety risk point identifying method for integrated traffic transportation network
ActiveCN108520353AEnhanced Response to Natural DisastersImprove emergency capabilitiesResourcesNatural disasterDependability
The invention discloses a safety risk point identifying method for an integrated traffic transportation network, and the method comprises the following steps: 1), analyzing the correlation of the infrastructures of the integrated traffic transportation network; 2), determining an evaluation index for an event influence result; 3), determining an event influence diffusion matrix; 4), estimating therisk of the infrastructures of the integrated traffic transportation network; 5), determining a safety risk point of the integrated traffic transportation network. The invention aims at solving a problem of an existing integrated traffic transportation network for advanced prevention and control, and innovatively proposes the safety risk point identifying method for the integrated traffic transportation network. The method meets the demands of an integrated traffic transportation manager for the safety risk prevention and control, improves the natural disaster and emergency handling capability of the integrated traffic transportation network, improves the reliability of a traffic transportation system, and lays a foundation for the guaranteeing of the national transportation safety.
Owner:RES INST OF HIGHWAY MINIST OF TRANSPORT +1
Psychoacoustics model processing method based on advanced audio decoder
ActiveCN101308659AImprove coding efficiencyImprove encoding qualitySpeech analysisRate distortionDiffusion matrix
The invention discloses a psychoacoustic model processing method based on an advanced audio encoder. The psychoacoustic model processing method includes the following steps: A, the perceptual entropy threshold value and the masking limen of a coding sub-band are obtained by the spectrum energy of the psychoacoustic of the sub-band of the bit stream to be encoded through masked diffusion matrix algorithm; B, anticipated bit consumption of the sub-band is calculated by employing time-frequency correction and anticipated echo correction through the perceptual entropy threshold value and the masking limen of the coding sub-band; C, the psychoacoustic model outputs the anticipated bit consumption of the sub-band, which then serves as a parameter for code rate distortion so as to carry out the encoding process. The psychoacoustic model processing method can obtain the bit consumption of the sub-band through the perceptual entropy more accurately and the anticipated value is taken by the encoder as the parameter for code rate distortion control, thus greatly improving quantizing encoding efficiency and quality of the encoder.
Owner:ZTE CORP
Construction method for ion diffusion model of cement based composite material
InactiveCN103440409AShorten the timeHas step convergenceSpecial data processing applicationsThree-dimensional spaceDiffusion matrix
The invention discloses a construction method for an ion diffusion model of cement based composite material. According to a cement based composite material microcosmic / meso-structure discretized into a series of equally-sized cube three-dimensional space grids, each pair of adjacent cube three-dimensional space grids with ion diffusion capability therebetween is used as one lattice diffusion unit, all the lattice diffusion units together construct a three-dimensional lattice ion transport network, and each grid is used as one diffusion node. The invention also discloses an acquiring method for an ion diffusion coefficient of the cement based composite material. Diffusion matrix equations of every two diffusion nodes in the three-dimensional lattice ion transport network are combined with ion concentration boundary conditions to build ion diffusion matrix equations, the diffusion matrix equations are solved to obtain an ion concentration distribution under steady state, and the ion diffusion coefficient is finally obtained. The construction method for the ion diffusion model of the cement based composite material is broad in application range and simple in algorithm and has important significance to the ion diffusion research of cement based material.
Owner:HOHAI UNIV
Digital image encryption method and apparatus based on fractional order transformation
ActiveCN108270944AEncryption is perfectImprove noiseSecuring communication by chaotic signalsPictoral communicationImage transferTransfer procedure
The embodiment of the invention provides a digital image encryption method and apparatus based on fractional order transformation, and belongs to the technical field of digital image encryption. The digital image encryption method based on fractional order transformation includes the steps: acquiring the gray value of each pixel of an original image and the image matrix corresponding to the original image; according to the image matrix corresponding to the original image and a preset first scrambling algorithm, determining a spatial domain scrambling image matrix; presetting first fractional order transformation for the spatial domain scrambling image matrix, and obtaining a transformation domain image matrix; according to the transformation domain image matrix, the line number value and the row number value of the image matrix corresponding to the original image, the gray value of each pixel and a preset first diffusion algorithm, determining a diffusion matrix; and according to the diffusion matrix, the transformation domain image matrix and the preset first scrambling algorithm, determining an encryption image matrix. The digital image encryption method based on fractional ordertransformation can improve the anti-noise and anti-loss performance of the cryptograph image during the practical transmission process, and can reduce the bandwidth cost generated during the image transmission process.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Image saliency detection method and terminal based on multi-feature diffusion
ActiveCN108320281AImprove accuracyAvoid detection as backgroundImage enhancementImage analysisDiffusionSaliency map
The invention provides an image saliency detection method and terminal based on multi-feature diffusion. When a seed node is selected, not all nodes at the edge of an image are defaulted to backgroundnodes. On the whole, three priori algorithms of background priori, color prior and position prior are fused as the high-level prior features of the image to select the seed node, so that not all saliency objects at the edge are detected as background. Finally, the multi-layer features of the image are extracted to construct different diffusion maps and diffusion matrices. The similarity of nodesis reflected from multiple angles, and corresponding saliency maps acquired from the middle and high-level features of the image are nonlinearly fused to acquire the final saliency map. Compared withsome classical saliency object detection algorithms in the prior art, the method and terminal, which are provided by the invention, have the advantages that the accuracy of image saliency detection isimproved in the aspect of a common data set, and the problems that saliency object detection is not prominent and the background area cannot be well restrained in the prior art are solved.
Owner:FUJIAN NORMAL UNIV
Depth domain seismic fluid analysis method, device and system and storage medium
ActiveCN110161563AReflect the actual situationHigh precisionSeismic signal processingDiffusionDiffusion matrix
The invention discloses a depth domain seismic fluid analysis method, device and system and a computer readable storage medium. The method comprises the steps that pulse data of each sampling point inthe imaging process under different incident angles is acquired respectively; according to each piece of pulse data corresponding to each incident angle, subspace diffusion matrixes in one-to-one correspondence with all the sampling points under the corresponding incident angles are established; a convolution model of a depth domain is established according to each subspace diffusion matrix to obtain a depth domain synthetic seismic record; and inversion analysis is performed on the depth domain synthetic seismic record to obtain an inversion analysis result. According to the method, the subspace diffusion matrix of each sampling point under the different incident angles is established based on the pulse data corresponding to each sampling point under the different incident angles, then the convolution model of the depth domain is established, therefore, the depth domain synthetic seismic record obtained through the convolution model can better reflect the actual situation of an underground medium, and improvement to the precision of depth domain seismic fluid recognition is benefited.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Quantitative evaluation method for stability of power grid
The invention discloses a quantitative evaluation method for stability of a power grid. The method includes steps of acquiring measurement data related to power grid safety and stability through calculation and analysis of a power system; performing modeling on the random dynamic power system; based on the measurement data, analyzing the stability of the power grid by utilizing a critical slowing-down theory. The method is quick in calculation. A large amount of time domain simulation numerical integration is not needed in semi-analytical method; the semi-analytical method is very suitable fora condition with small diffusion matrix strength in a random process.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
An image encryption method based on four-dimensional Chen's hyperchaotic system and K-means clustering
ActiveCN109376793AGood pseudorandomnessImprove performanceCharacter and pattern recognitionDigital data protectionImaging processingCiphertext
The invention relates to the field of image processing, in particular to an image encryption method based on four-dimensional Chen's hyperchaotic system and K-means clustering. The invention adopts high-dimensional continuous hyperchaotic system-four-dimensional Chen's system to generate chaotic sequence, ensures that the algorithm has larger key space, and adopts K-Means clustering algorithm is used to process the chaotic sequences generated by Chen's system, and the binary sequences with good pseudo-random performance are obtained (through US NIST statistical test). Secondly, according to the property of bit-plane decomposition of plaintext image, an efficient scrambling algorithm is designed, and an intermediate result sharing link is added between scrambling and spreading to improve the encryption security. Finally, the traditional linear diffusion function is improved and the diffusion matrix generated by the pseudo-random binary sequence is used to perform linear bidirectional diffusion on the pixels of the initial ciphertext, which further improves the performance of the system against the attack of differential analysis.
Owner:SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
Air pollution tracing method and device, computer equipment and storage medium
ActiveCN111339500ATimely preventive measuresFast trackComplex mathematical operationsMaterial analysisEngineeringPollution
The invention relates to an air pollution tracing method and device, computer equipment and a storage medium. The method comprises the steps of processing historical air quality data based on a Gaussian process regression algorithm, and determining related air stations corresponding to the air stations and meeting related conditions; carrying out matrix processing on the quality data at the tth moment and the air quality data at the (t-1) th moment to obtain a diffusion matrix of the polluted air station at the tth moment; correcting the diffusion matrix according to the geographic position information of the polluted air station at the tth moment, the geographic position information of the related air station of the polluted air station at the tth moment, the wind speed at the t-1 momentand the wind direction at the t-1 moment; and obtaining a decision matrix of the polluted air station at the t-th moment according to the corrected diffusion matrix, and determining the pollution source air station of the polluted air station at the t-th moment according to the decision matrix, so that the pollution source can be traced back quickly and accurately.
Owner:ZHONGXING INSTR SHENZHEN
Neodymium-iron-boron magnet with double main phases and light rare earth diffusion based on asymmetric cerium distribution and preparation method of neodymium-iron-boron magnet
The invention discloses a neodymium-iron-boron magnet with double main phases and light rare earth diffusion based on asymmetric cerium distribution and a preparation method, and relates to the technical field of neodymium-iron-boron magnets. The method comprises the steps that a diffusion matrix is prepared through a double-main-phase technology, in the double-main-phase technology, the components of a main-phase alloy and an auxiliary-phase alloy are RaCebFe100-a-b-c-dMcBd, R is PrNd alloy or Nd metal, M is at least one of Cu, Al, Zr, Co and Ga, the content of Ce in the main-phase alloy is larger than that of Ce in the auxiliary-phase alloy, then the upper surface and the lower surface of the diffusion matrix are coated with a diffusion source solution, and the diffusion matrix is obtained through heat treatment. Carrying out heat treatment and aging treatment to obtain a neodymium-iron-boron magnet; the diffusion source solution is formed by mixing a diffusion source and a solvent, and the diffusion source is (PrmNdn) aAlbCucZrdCoeMgf. The neodymium-iron-boron magnet obtained through the method has high residual magnetism and high coercive force at the same time, the diffusion efficiency of the diffusion source is high, and the rare earth utilization rate is increased.
Owner:MIANYANG JUXING PERMANENT MAGNET MATERIAL CO LTD
Method for determining the position of moving objects
ActiveUS9250078B2Improve positionIncrease speedNavigational calculation instrumentsNavigation by speed/acceleration measurementsOdometryNormal density
Method for determining the position of moving objects, wherein the object has a sensor or an apparatus for determining odometry data, having the steps of: transmitting the odometry data to a calculation device, estimating the location and position of the object with the aid of the calculation device, creating a diffusion matrix on the basis of the estimated location and position taking into account environmental data, determining a contour line on the basis of the diffusion matrix, determining the distances between the position and the contour line for different orientations, in particular each orientation, and calculating a probability density function on the basis of the distances determined.
Owner:DEUTSCHES ZENTRUM FUER LUFT & RAUMFAHRT EV
Method for predicting ion diffusion coefficients of damaged cement based composite materials
The invention discloses a method for predicting ion diffusion coefficients of damaged cement based composite materials. According to the method, regarding the microcosmic structure of damaged cement based composite materials which are discretized into a series of cube three-dimensional space lattices with equal size, each pair of adjacent cube three-dimensional space lattices are used as a lattice diffusion unit, wherein ion diffusion ability exists between each pair of adjacent cube three-dimensional space lattices, all the lattice diffusion units combine together to form a three-dimensional lattice ion transmission network, and each lattice is used as a diffusion node. Damage cracks are processed as hole phases, an ion diffusion matrix equation is established by using diffusion matrix equations between every two adjacent diffusion nodes in the three-dimensional lattice ion transmission network and combining ion concentration boundary conditions, solution is carried out on the ion diffusion matrix equation to obtain ion concentration distribution under a steady state, and finally the ion diffusion coefficients of the damaged cement based composite materials is obtained. The method for predicting the ion diffusion coefficients of damaged cement based composite materials can accurately predict ion diffusion ability change rules of the damaged cement based composite materials under the influences of freeze thawing, loading, air shrinkage and other conditions.
Owner:HOHAI UNIV
Method for determining the position of moving objects
ActiveUS20140100776A1Increase speedReduce effortNavigational calculation instrumentsNavigation by speed/acceleration measurementsOdometryAlgorithm
Method for determining the position of moving objects, wherein the object has a sensor or an apparatus for determining odometry data, having the steps of: transmitting the odometry data to a calculation device, estimating the location and position of the object with the aid of the calculation device, creating a diffusion matrix on the basis of the estimated location and position taking into account environmental data, determining a contour line on the basis of the diffusion matrix, determining the distances between the position and the contour line for different orientations, in particular each orientation, and calculating a probability density function on the basis of the distances determined.
Owner:DEUTSCHES ZENTRUM FUER LUFT & RAUMFAHRT EV
Three-dimensional undulating surface seismic data migration imaging method, device and system
ActiveCN108802821ANo added computational costIncrease computational costSeismic signal processingDiffusionGeomorphology
The present invention discloses a three-dimensional undulating surface seismic data migration imaging method, device and system. The method includes the following steps that: a three-dimensional topographic partial derivative is acquired; a central ray coordinate system from each shot point and each receiving point to each underground imaging point, ray directions from each shot point and each receiving point to each underground imaging point, and travel time from each shot point and each receiving point to each underground imaging point are acquired; amplitude and a geometric diffusion matrixfrom each shot point and each receiving point to each underground imaging point are acquired; the Beylkin determinant of a three-dimensional undulating surface is calculated according to the the three-dimensional topographic partial derivative, the central ray coordinate system from each shot point and each receiving point to each underground imaging point, the rays direction from each shot pointand each receiving point to each underground imaging point, and the geometric diffusion matrix from each shot point and each receiving point to each underground imaging point, and migration imaging is performed on the seismic data of the three-dimensional undulating surface according to a calculation result, the travel time from each shot point and each receiving point to each underground imagingpoint, and the amplitude from each shot point and each receiving point to each underground imaging point.
Owner:PETROCHINA CO LTD
A SAR image super-resolution method based on edge information and deconvolution
ActiveCN103839238BIntegrity guaranteedPredictive directionalityImage enhancementFast Fourier transformMaximum a posteriori estimation
Owner:XIDIAN UNIV
A customer data screening method based on a small sample non-uniform diffusion algorithm
PendingCN109919418APrecise positioningReduce data volumeResourcesSpecial data processing applicationsDiffusionSmall sample
The invention discloses a customer data screening method based on a small sample non-uniform diffusion algorithm, relates to the technical field of data analysis, and solves the technical problem of accurately positioning customers. The method comprises the following steps: firstly, selecting two fields from a client database as two diffusion direction vectors, and selecting one field as a diffusion variable factor; establishing a two-dimensional coordinate system according to the two diffusion direction vectors; carrying out diffusion on the client database by adopting a non-uniform diffusionalgorithm; selecting a section of sub-matrix meeting a screening condition from the diffusion matrix; obtaining a sample point set through aggregation, randomly selecting a plurality of records froma client database as a control point set, analyzing the sample point set by adopting a correlation estimation expectation formula, removing unqualified sample points according to a correlation estimation expectation value, and finally obtaining a screening result of client data. The method provided by the invention is particularly suitable for small and micro enterprises with less basic customerdata.
Owner:上海九霄祥云网络科技股份有限公司
Single-output feedback-free sequential test response compression circuit
InactiveCN1277181CElectronic circuit testingSemiconductor/solid-state device detailsShift registerDiffusion network
Owner:INST OF COMPUTING TECH CHINESE ACAD OF SCI
A mcraly coating with excellent oxidation resistance and preparation method thereof
InactiveCN101787516BAvoid damageLow oxidation rate constantVacuum evaporation coatingSputtering coatingElectron beam physical vapor depositionEvaporation
The invention discloses a MCrAlY coating with excellent oxidation resistance and a preparation method thereof. The plasma-assisted electron beam physical vapor deposition technology is used to prepare the coating by controlling the temperature of the substrate, the anode discharge voltage, the evaporation current and the bias voltage applied on the substrate. The MCrAlY coating has an equiaxed grain size of 10-50 μm; the coating is strongly oriented along the (111) close-packed direction; the twin size in the coating is 200-500 nm; the phase in the coating is along the growth direction It is uniformly distributed in strips, and the size of the β phase is less than 1 μm, forming a large number of phase interfaces. When the coating is used at 1150 °C, the high-density twins and phase boundaries provide channels for the rapid diffusion of Al elements, making it easier to form a dense α-Al2O3 protective film, and at the same time weaken the matrix element diffusion to form an oxide film. The destructive effect of the coating is excellent, and the oxidation resistance of the coating is an order of magnitude higher than that of the traditional EB-PVD coating.
Owner:BEIHANG UNIV
Space-time Adaptive Processing Method Based on Radar Amplitude and Doppler Frequency Estimation
The invention discloses a time-space adaptive processing method based on radar amplitude and Doppler frequency estimation. The approach is as follows: determining an airborne radar which emits pulse signals and receives radar echo signals in a detection scope, obtaining an N*M*L-dimensional radar echo signal matrix through calculation, calculating a D*L-dimensional radar echo signal matrix P of power values at D Doppler channels corresponding to L distance units in N array elements, obtaining K targets, accordingly, obtaining a diffusion distance unit scope corresponding to power spectra of the K targets, initializing K, calculating an M*delta1k*C-dimensional radar echo signal estimation matrix Tk corresponding to delta1K diffusion distance units in a diffusion matrix unit diffusion scope Lk of the power spectrum of the k-th target, accordingly, calculating a power spectrum diffusion estimation matrix Tk<^> of the k-th target, adding one to k until the power spectrum diffusion estimation matrix Tk<^> of the k-th target is obtained, and then according to a scope from the obtained power spectrum diffusion estimation matrix T1<^> of the first target to the power spectrum diffusion estimation matrix Tk<^> of the k-th target, calculating a training sample F for time-space adaptive processing of the airborne radar.
Owner:XIDIAN UNIV
A kind of fe-v gradient material and preparation method thereof
InactiveCN105063692BShorten the formation timeIncrease thickening speedJewelleryGradient materialThermal shock
The invention discloses an Fe-V gradient material and a preparation method thereof. NaCl-KCl-NaF is used as a molten salt medium, V2O3 is used as a solute to configure a molten salt system; a steel plate is used as a cathode, and a metal V plate is used as an anode. The Fe-V gradient material can be obtained by DC pulse electrodeposition in a molten salt system. This method uses molten salt as the medium, and under the action of direct current, the Fe-V gradient material is prepared by one-step electrodeposition of V oxides; a smooth and smooth pure V layer can be obtained, and V is diffused in the low-carbon steel matrix. , Fe-V gradient materials containing pure V layers are actually obtained. The method adopts a molten salt system, the component raw materials are easy to obtain, the price is low, the cost is low, and the energy consumption is small; the production process is short, the operation is simple, the parameter control range is wide, and it is easy to realize. The method has the characteristics of fast gradient layer formation speed, short preparation time, freely controllable gradient layer thickness, compact material surface structure, simple process, etc., and the obtained gradient material has good thermal shock resistance and thermal fatigue resistance.
Owner:NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
A Construction Method of Ion Diffusion Model for Cement-Based Composite Materials
InactiveCN103440409BShorten the timeHas step convergenceSpecial data processing applicationsDiffusionThree-dimensional space
Owner:HOHAI UNIV
A three-dimensional relief surface seismic data migration imaging method, device and system
ActiveCN108802821BNo added computational costIncrease computational costSeismic signal processingDiffusionGeomorphology
The present invention discloses a three-dimensional undulating surface seismic data migration imaging method, device and system. The method includes the following steps that: a three-dimensional topographic partial derivative is acquired; a central ray coordinate system from each shot point and each receiving point to each underground imaging point, ray directions from each shot point and each receiving point to each underground imaging point, and travel time from each shot point and each receiving point to each underground imaging point are acquired; amplitude and a geometric diffusion matrixfrom each shot point and each receiving point to each underground imaging point are acquired; the Beylkin determinant of a three-dimensional undulating surface is calculated according to the the three-dimensional topographic partial derivative, the central ray coordinate system from each shot point and each receiving point to each underground imaging point, the rays direction from each shot pointand each receiving point to each underground imaging point, and the geometric diffusion matrix from each shot point and each receiving point to each underground imaging point, and migration imaging is performed on the seismic data of the three-dimensional undulating surface according to a calculation result, the travel time from each shot point and each receiving point to each underground imagingpoint, and the amplitude from each shot point and each receiving point to each underground imaging point.
Owner:PETROCHINA CO LTD
A method and device for digital image encryption based on fractional transformation
ActiveCN108270944BEncryption is perfectImprove noiseSecuring communication by chaotic signalsPictoral communicationImage transferTransfer procedure
The embodiment of the invention provides a digital image encryption method and apparatus based on fractional order transformation, and belongs to the technical field of digital image encryption. The digital image encryption method based on fractional order transformation includes the steps: acquiring the gray value of each pixel of an original image and the image matrix corresponding to the original image; according to the image matrix corresponding to the original image and a preset first scrambling algorithm, determining a spatial domain scrambling image matrix; presetting first fractional order transformation for the spatial domain scrambling image matrix, and obtaining a transformation domain image matrix; according to the transformation domain image matrix, the line number value and the row number value of the image matrix corresponding to the original image, the gray value of each pixel and a preset first diffusion algorithm, determining a diffusion matrix; and according to the diffusion matrix, the transformation domain image matrix and the preset first scrambling algorithm, determining an encryption image matrix. The digital image encryption method based on fractional ordertransformation can improve the anti-noise and anti-loss performance of the cryptograph image during the practical transmission process, and can reduce the bandwidth cost generated during the image transmission process.
Owner:BEIJING UNIV OF POSTS & TELECOMM