57 results about "Shielding factor" patented technology

A magnetically shielded conductor assembly with a conductor device and a film of nanomagnetic material located above the conductor device. The conductor device has a resistivity of from about 1 to about 2,000 micro ohm-centimeters. The film of nanomagnetic material has a thickness of from about 100 nanometers to about 10 micrometers and a magnetic shielding factor of at least about 0.5. The nanomagnetic material has a mass density of at least about 0.01 grams per cubic centimeter, a saturation magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers.

A shielded substrate assembly that contains a magnetic shield with a layer of magnetic shielding material; the magnetic shield has a magnetic shielding factor of at least about 0.5. The magnetic shield contains nanomagnetic material nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturation magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers. The nanomagnetic material contains magnetic material with a coherence length of from about 0.1 to about 100 nanometers.

An implantable device that contains a power source, a device for producing electrical signals, and a conductor assembly for communicating the electrical signals to biological matter. The conductor assembly contains of a conductor that is capable of being flexed at least about 15 degrees and that has a resistivity at 20 degrees Centigrade of from about 1 to about 100 micro ohm-centimeters. The conductor assembly also contains a magnetic shield located above the flexible conductor; the magnetic shield contains an antithrombogenic composition. The magnetic shield also contains a magnetic shielding material that has a magnetic shielding factor of at least about 0.5.

The invention discloses a characteristic matching and MeanShift algorithm-based target tracking method. The method comprises the following steps: inputting an image sequence, carrying out background reconstruction on the image sequence, obtaining a target area of an initial moment and modelling by adopting a MeanShift algorithm; carrying out SIFT characteristic extraction on a target area model of the initial moment and taking the SIFT characteristic point of the target area model of the initial moment as an initial characteristic point of a characteristic library; calculating the initial position, size parameter and rotation parameters of the current frame of target through SIFT characteristic matching; accurately positioning the target by adopting the MeanShift algorithm; calculating a shielding factor of the target, judging the shielding degree of the target and determining the tracking mode of the target; and ending the target tracking after all the images in the image sequence are tracked. According to the method, the MeanShift algorithm and the SIFT characteristic matching algorithm are combined and the advantages of the two algorithms are exploited so that the stable tracking the target is realized.

The invention discloses a video based multi-vehicle traffic information detection method. The method includes the steps of acquiring traffic video; setting parameters; initializing a system; detecting a vehicle object; combining an initial color background image with an RGB (red, green, blue) color image in current frame of a video to obtain a self-adapting real-time dynamic color background image; extracting a color difference result image fgi; segmenting a Otsu threshold in a self adaptation manner; removing shadow off a foreground target image; performing morphological operation and filling car mass; counting cars; judging whether the car is detected by at least one virtual detecting coil or not, if yes, determining that the car is detected by the virtual detecting coil, adding 1 to total number of the cars, and executing the step 5; if not, executing the step 406; and acquiring traffic information of the multiple vehicles. By the aid of the video based multi-vehicle traffic information detection method, every passing car is traced, vehicle type and speed of the car are recorded, traffic information of the multiple vehicles such as flow and average speed of different vehicles are obtained, lane crossing vehicles, adhesion and shielding factors of the vehicles are fully considered, anti-interference performance is strong, and detecting accuracy is high.

The invention discloses a three-dimensional point cloud reconstruction method based on improved shield poisson algorithm. The method comprises the following steps: obtaining a three-dimensional point cloud data of a model; introducing shielding factor, and preprocessing the constraint of the poisson algorithm by the constraint of the introduction point and the gradient; using the octree segmentation to simplify the denoising of the point cloud, compressing the storage, establishing the inter-cloud topology, and realizing the fast establishment and efficient searching of the octagonal tree neighbor nodes; normalizing each point cloud vector to reduce the ambiguity of normal direction; calculating the vector field; solving poisson equation to get instruction function; on point cloud equivalent surface extraction, getting three-dimensional reconstruction model. The method of the three-dimensional point cloud reconstruction method based on improved shield poisson algorithm has the advantages of improving the normal vector precision, removing the pseudo-closed surface well, and being well filled with the hole, and the detail of the object is rich. The method can be widely used in the fields of reverse engineering, cultural restoration, and medical image.

The invention provides a super-hybrid composite laminate for neutron shield. The super-hybrid composite laminate comprises a metal plate and a fiber enhanced resin-based composite layer which are alternately laminated, wherein the fiber enhanced resin-based composite layer is prepared from basalt fiber, epoxy resin, modified boron carbide, a curing agent, a moderator and a neutron absorber. The provided fiber enhanced resin-based composite layer has excellent shielding performance and mechanical performance, has the density of 2.36-2.42 g/cm<3>, the tensile strength of 1,120-1,160 MPa, the tensile modulus of 82-85 GPa and the interlaminar shear strength of 78-85 MPa, has the <252>CF neutron source shielding factor Kf (15 mm) of 2.65-3.02 and the neutron shield rate Ath10 (10mm) of 99.88%-99.89%. The invention further provides a preparation method of the composite laminate. The preparation method is simple and convenient to operate and easy to implement.

The invention relates to a method for preparing an electromagnetic shielding wooden plate. The method comprises the following steps: (1) preparing a base material according to the mass ratio of 1:1-1:2 of a wood powder and a graphite powder, mixing in a mixer, adding magnetic particles accounting for 0.5%-1% of the mass of the graphite powder, agitating and heating to 100-120 DEG C; (2) adding a finishing agent accounting for 0.5%-1.4% of the amount of the base material, and a resin which is 1.67-2.5 times of the amount of the base material in the mixer, mixing for 8-15 minutes, discharging the material and feeding the material to a cool mixer, mixing to the normal temperature, and granulating; and (3) cutting, packaging and measuring the shielding factors after the granulated materials enter a plate extrusion device for formation. The invention has the advantages of low cost, wide resource, low density, high electromagnetic shielding capacity in an ultra wideband range, and higher electromagnetic wave absorption capacity.

The invention discloses a hundred nanometer scale ultrafine light needle field focusing design method, belonging to the nanometer photonics focusing and micromachining technology field. The hundred nanometer scale ultrafine light needle field focusing design method comprises steps of using a vector angle theory to integrally describe the diffraction propagation behavior of a rear light field when a polarized light beam illuminates the microstructure metallic film endless belt, using an equivalent numerical value NAeq and a normalization center shielding factor Epsilon to retrain the horizontal scale of the focusing light beam, axially introducing an ultra Gaussian function to restrain to form an ultrafine light needle field and thus to establish a non-linear restrain optimization model, using a configured heredity algorithm and a rapid hankel transformation algorithm to program and solve the optimized model, configuring an optimized initial parameters which comprises a structure parameter and an algorithm parameter to repeatedly execute the optimization algorithm, and optimally choosing the microstructure metallic film endless belt sheet. On the basis of the invention, the metallic film endless belt sheet with different polarized light beams and various scale microstructures and can be used for realizing the micro-nano lithography, the nanometer printing and super-resolution microscopic imaging.

The invention relates to a statistical method of a number of people in a monitoring video. The method comprises the following steps of establishing a pedestrian sample database; for each frame of video image, using a hybrid Gaussian background modeling method and combining morphological filtering so as to acquire a foreground image; through calculating a number of foreground pixels in the foreground image, acquiring a foreground area and a normalization scene area; taking image foreground as a template, extracting Harris angle point information and SURF characteristic point information, and using an effective characteristic point number in an unit area to represent a shielding degree among groups in a scene; taking a normalization scene area S2 and crowd shielding factors D1 and D2 as an input vector and taking a statistical people number in the scene as an output vector, and training a BP network to complete construction of a regression model T1; extracting an HOG characteristic in the pedestrian sample database and using an Adaboost cascade classifier T2 to train a corresponding pedestrian detector; and constructing a combination classifier and realizing adaptive calculating of a weight during classifier fusion.

The invention discloses an acoustic screen method of a multi-path channel. The method of the invention comprises the following steps: a sound velocity meter measures the acoustic velocity of water; a horizontal receiving array receives a radiation signal of a plurality of point sources in a sound field, amplifies the filtration and then carries out the data acquisition; the weight obtained by realizing the sound focusing of a spherical sound field array is the optimum focusing weight; based on the optimum focusing weight, shielding factors are increased to obtain the optimum focusing shielding weight; the output waveform is obtained by inverse Fourier transform and output power also can be obtained by frequency domain integral; the following coherent processing is carried out or the power after sound shielding and focusing is output. The invention is based on the principle and the method of sound shielding, applicable to multi-point source coherent interference in the water acoustics engineering; and in the engineering, the invention can adopt the horizontal array, thus being more applicable to being loaded on motion platform or being fixed at sea bottom.

The invention discloses a method for calculating a lightning strike shielding effect between adjacent transmission lines. The method includes the steps of firstly obtaining the lightning damage statusand line and tower parameters of a region where an important transmission channel is located, and determining electrical geometric parameters and lightning related parameters for the use in simulation calculation; then on the basis of an improved EGM model, establishing a simulation model for two or more, extra-high voltage or ultra-high voltage, AC or DC, and single-circuit or multi-circuit lines set up in parallel in the important transmission channel, determining a mutual positional relationship of phase conductor arcs of the lines, calculating projection widths of the arcs at different lightning current amplitudes and different lightning incident angles, determining the projection priority of each arc at the same time, then calculating the lightning bypassing rate of each phase conductor of each line considering a shielding effect, and introducing a lightning shielding factor to quantitatively evaluate the lightning strike shielding relationship between the different lines. The method in the invention is applicable to the calculation of the lightning strike shielding effect between the adjacent lines in the important transmission channel, and provides a basis for the evaluation of the lightning damage to the lines and the line reconstruction in the important transmission channel.

An irradiation property weather scene-based photovoltaic power generation acceptance estimation model comprises the steps of analyzing and acquiring distribution property and random property of photovoltaic contribution according to running data of a solar photovoltaic system, and respectively modeling a certainty part and a randomness part of the solar photovoltaic contribution; simulating son irradiation intensity of an arbitrary place on earth at an arbitrary moment under the condition of no shielding by building a global solar radiation model with regard to the certainty part of the solarphotovoltaic contribution, and calculating an upper limit value of photovoltaic forecast contribution; modeling a photovoltaic power generation randomness part by a photovoltaic shielding factor withregard to the random part of the solar photovoltaic contribution, building a photovoltaic shielding factor probability distribution model to obtain a random part simulation value of the photovoltaic contribution, and generating a contribution time sequence of a solar photovoltaic system by superposing results of the certainty part and the randomness part. By the method, the problem of power grid running uncertainty under large-scale new energy grid connection is solved, and the running capability and effect of a power grid are improved.

The invention discloses a high-precision clock chip territory structure with a temperature compensation function. A basic rule is that a sensitive analog module which has a small signal and is easy to interfere gets away from a high-frequency digital module as much as possible; and the sensitive analog module and the high-frequency digital module are isolated by a high-amplitude analog module (such as a buffer and a comparator) and a low-speed digital module. The territory comprises a first territory region, a second territory region, a third territory region, a fourth territory region, a fifth territory region, a sixth territory region and a seventh territory region; the seventh territory is distributed around a clock chip territory, and other territories are arranged in the center of the chip; the first territory supplies a reference source to other territory regions; the second territory region is connected with the third territory region; the third territory region is connected with the sixth territory region; the sixth territory region is connected with the fourth territory region; and the fourth territory region is connected with the fifth territory region. According to the high-precision clock chip territory structure with the temperature compensation function, the sub territories are fixedly arranged, and the positions are rational in arrangement; and moreover, a power ground factor, a matching factory, a shielding factor and an interconnection factor are comprehensively considered, so that the influence of noise of a digital circuit switch on an analog circuit is reduced to the maximum extent, and the design success rate of the high-precision clock chip territory structure with the temperature compensation function is guaranteed.

The invention relates to a radiation field shielding scheme feasibility discriminating method. The radiation field shielding scheme feasibility discriminating method comprises the following steps thatshielding scheme parameters input by a user are obtained; shielding factors corresponding to the shielding scheme parameters are determined; according to a pre-established three-dimensional radiationfield model, the before-shielding radiation dose rate of a position to be shielded is calculated, and thus the after-shielding radiation dose rate is calculated according to the before-shielding radiation dose rate and the shielding factors; shielding establishment time for carrying out a shielding scheme corresponding to the shielding scheme parameters is determined; the first working dose borneby workers after the shielding scheme is carried out is calculated; the second working dose borne by the workers during direction overhaul is calculated, wherein the second working dose is calculatedaccording to the before-shielding radiation dose rate and overhaul time; the first working dose and the second working dose are compared to obtain a shielding scheme feasibility discriminating result. By adopting the method, the shielding effect of the formulated radiation field shielding scheme can be accurately estimated.

The invention discloses a vehicle-mounted Lidar steel rail point cloud extraction method based on generalized neighborhood height difference. The vehicle-mounted Lidar steel rail point cloud extraction method specifically comprises the following steps: 1, segmenting track bed point cloud according to a scanning angle or a track line of a vehicle-mounted Lidar point cloud; 2, adopting a statisticalfiltering algorithm to remove noise points caused by shielding factors of the steel rail in the ballast bed point cloud, and obtaining the ballast bed point cloud with the noise points removed; 3, carrying out columnar neighborhood search on one point in the ballast bed point cloud; 4, calculating the generalized neighborhood height difference of the point based on the columnar neighborhood; 5, repeating the step 3-4 until the generalized neighborhood height difference calculation of all points of the ballast bed area is completed, and a histogram is made; and 6, combining track knowledge anda generalized neighborhood height difference histogram to extract a steel rail vertex cloud. The vehicle-mounted Lidar steel rail point cloud extraction method can automatically extract the whole-line continuous steel rail vertex cloud, improves the extraction precision of the steel rail point cloud, is less in dependence on additional data, and is simple to implement.

A magnetic shielding apparatus having a high shielding effect. With the magnetic shielding apparatus having an opening (for example, a cylindrical magnetic shielding apparatus provided with a door), the door covering the opening is electrically and/or magnetically connected to a main body by means of electrically and/or magnetically connecting members. The magnetic shielding apparatus is higher in magnetic shielding factor than the conventional magnetic shielding apparatus, and a magnetic field measuring apparatus using the magnetic shielding apparatus, capable of measuring biomagnetism generated from an inspection target (a living body), with higher sensibility than before.

The invention discloses a maritime search and rescue wireless sensing network synergic positioning method which comprises the following steps: S1, establishing a Lagrange model as a marine movement model of a node; S2, acquiring a synergic positioning system model of an unknown node on the basis of an unknown node state model described by an invisible markoff chain and a marine movement model and an observation model of the node, estimating posterior probability distribution by using a particle filter algorithm, and estimating the position of the unknown node according to the estimated posterior probability distribution; S3, improving a likelihood function in the particle filtering algorithm by using KL (Kullback Leibler) divergence, and reducing errors caused by sea wave shielding factors by optimizing parameters; and S4, introducing the likelihood function of the optimized parameters, updating confidence factors and iterative position estimation in a residual error-system resampling mode to alleviate degeneration of particles, and estimating the position of the unknown node. The method has the advantage that positioning errors caused by marine shielding effects and multipath effects on an offshore wireless sensing network are avoided.

The present invention provides a low-noise and high-shielding-coefficient iron-based amorphous material electromagnetic shielding barrel. The main components of the iron-based amorphous material havethe following chemical formulas: FexSiyB1-X-Y, x=0.5-0.95 and y=0.5-0.05, the relative permeability of the iron-based amorphous material can reach 450,000, and the iron-based amorphous material is utilized to form an electromagnetic shielding barrel combination of a barrel body, an upper cover and a lower cover. The defect that a traditional permalloy magnetic shielding barrel is large in magneticnoise is overcome, and the application requirements of high shielding coefficient and low magnetic field noise are met, for example, the requirements of an ultra-high-performance atomic spin quantumsensor are met.

The invention discloses a dual non-uniform space self-shielding effect correction method, a device, equipment and a medium. The method comprises the steps: calculating the number of neutrons escapingfrom the surface of fuel and the number of neutrons entering adjacent fuel lattice cells for collision in a moderator after escaping from the surface of the fuel through a Monte Carlo method, and obtaining the number of neutrons escaping from the surface of the fuel; obtaining a Dankov factor, and then correcting the neutron escape probability through the Dankov factor so as to correct the dual non-uniformity of neutron resonance calculation; according to the fact that the escape probability of neutrons in the randomly distributed medium area before and after homogenization is not changed, enabling the randomly distributed medium area to be equivalent to a homogenization medium; calculating the equivalent cross section of the homogenizing medium based on the macroscopic cross sections of the dispersed particles and the sub-regions of the matrix and the volume shares and the space self-shielding factors corresponding to the sub-regions, so as to correct the dual non-uniformity of neutron transport calculation and realize the correction of the dual non-uniformity space self-shielding effect of the randomly distributed medium fuel element. The neutron calculation accuracy is improved.

The utility model discloses a novel multi-layer belt winding type low-noise permalloy magnetic shielding barrel structure. A permalloy strip with an insulating layer on the surface is wound into at least two layers of strip-wound magnetic shielding barrel main body structures; the radial conductive thickness of the shielding barrel is discontinuous to prevent eddy current transmission, so that eddy current loss and Johnson current noise thereof are reduced, meanwhile, the radial magnetic conductive thickness is still kept continuous without increasing hysteresis loss and noise caused by the hysteresis loss, and the application requirements of high shielding coefficient and low magnetic field noise are met.

According to the video analysis-based real-time people flow monitoring method suitable for a dense scene. The method includes: acquiring a background image of a to-be-monitored area, and carrying outbackground learning on the background image by using a Gaussian mixture model; Obtaining a foreground original image of a to-be-monitored area, performing linear change on the background image and theforeground original image, and determining a change coefficient; Determining a threshold value by using the variation coefficient, and extracting a foreground image with a background removed from theforeground original image; Calculating the size of a pixel point occupied by a foreground individual in the foreground image by using a film and television perspective model; And determining the pedestrian flow of the to-be-monitored area by combining the shielding factor. The method is based on the existing video monitoring environment of the airport, and the passenger service quality is furtherimproved under the premise of improving the passenger travel experience and the target of reasonable service resource distribution.

The invention provides a preparation method of a fragment convergence type bulletproof composite material. The composite material sequentially comprises a fragment constraint layer, a blended modifiedelastomer layer and a modified damping rubber layer; and the fragment constraint layer is obtained by pre-treating aramid fibers, weaving a shallow cross-linked 2.5D braided structure by woven weaving, and finally curing and forming. The fragment convergence type bulletproof composite material prepared by the invention has the advantages of being high in anti-fragment performance, low in scattering angle, flame retardant, damping, capable of reducing vibration and noise, excellent in radiation shielding performance, etc.; and the structural loss factor in a resonance state is 0.033 to 0.062,the noise reduction amount is above 10dB(A), the oxygen index can reach 40%, the neutron radiation shielding factor is 1.63 to 1.87, and the fragment scattering angle can be as low as 5.6 to 12.9 degrees.