32 results about "Diffusion matrix" patented technology

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.

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.

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.

The present invention relates to a test response compressor in design of chip testability, and provides a single-output sequential comprssion circuit: quotient-compressor. Said compression circuit includes two portions: (1) response diffusion network and (2). quotient-shifting register chain. Said invention also provides three rules must be met for designing diffusion matrix correspondent to the response diffusion network, and its compression rate is high, and its testing time can be reduced, and it has no erroneous judgement.

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.

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.

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.

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.

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.

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.