285 results about "Matrix method" patented technology

A method for acquiring fine distribution of the reactor core three dimensional neutron flux density of a reactor comprises the following steps: 1, carrying out geometric modeling to a reactor core, dividing computational domain, dispersing angle space, generating characteristic line, appointing materials for all computing regions, obtaining macroscopic section parameters and setting initial values for neutron flux density flux of a computed region, terminal condition of reactor and characteristic value; 2, calculating coefficient matrix required by the matrix method of each sub region and a part which is positioned at the right end and cannot be changed with the iterative computation; 3, seeking the density of thicknet neutron flux and correcting the density of one-dimensional and two dimensional thinnet neutron flux; 4, seeking the density of one-dimensional neutron flux of each lattice cell; 5, iterative solution of the density of the two dimensional thinnet neutron flux of each layer; and 6, updating three dimensional thicknet parameters, judging whether a characteristic value and the density of a three dimensional neutron flux are in convergence or not, if in convergence, turning to the step 3 for continuous iteration under convergence is achieved, namely, fine distribution of three dimensional neutron flux density can be obtained; and the fine distribution of the reactor core three dimensional neutron flux density of a reactor can be obtained quickly.

Methods of making a three-dimensional matrix of nucleic acids within a cell is provided.

Methods and devices are provided for reducing the concentration of low molecular weight compounds in a biological composition containing cells while substantially maintaining a desired biological activity of the biological composition. The device comprises highly porous adsorbent particles, and the adsorbent particles are immobilized by an inert matrix.

The invention belongs to the technical field of control of microwave band electromagnetic wave, and in particular relates to an ultra-wideband microwave vortex super surface and a wideband design method thereof. The wideband design method comprises the steps of firstly, obtaining a condition of a super surface unit conforming to a PB (Pancharatnam-Berry) geometrical phase under a reflection system by a cascaded matrix method; further obtaining a condition conforming to a wideband PB phase by a dispersion engineering method; secondly, designing two unit structures and parameters which are under orthogonal polarization and conform to multi-mode resonance; and finally, calculating to obtain vortex phase distribution of the vortex super surface under different topological chargers according to a theoretical calculation formula, and applying VBA macro-modeling in CST to achieve a super surface topological structure according to a root seeking algorithm and by rotating the super surface. Therefore, the super surface unit composed of a three-layer metal structure and a two-layer dielectric plate is designed by the invention, and the ultra-wideband microwave vortex super surface is obtained by performing two-dimensional limited periodic extension on a series of super surface units according to certain phase distribution; and the ultra-wideband microwave vortex super surface can generate high-efficiency vortex wave beam between 6-18GHz and has the advantages of ultra wide working bandwidth, high efficiency, simple design, low cost and the like.

Methods and devices are provided for reducing the concentration of low molecular weight compounds in a biological composition, while substantially maintaining a desired biological activity of the biological composition. The device comprises highly porous adsorbent particles, and the adsorbent particles are immobilized by an inert matrix. The matrix containing the particles is contained in a housing, and the particles range in diameter from about 1 μm to about 200 μm. The matrix can be fibrous, and the particles can have a surface area greater than 750 m2 / g and a pore diameter between about 25 and 800 Å. The device can be used to adsorb and remove a pathogen-inactivating compound that is a nucleic acid-binding compound such as psoralen, an acridine derivative or a dye from a biological composition such as a blood product.

Methods and apparatus for enabling effective decoding of rate-compatible punctured codes are presented herein. A puncturing component can derive one or more partial puncturing patterns and corresponding decoding matrices / graphs that represent punctured code from a parity check matrix / graph of a mother code and a puncturing pattern specified for the mother code. Further, a rowcombining component can combine rows of the parity check matrix / graph based on the derived one or more partial puncture patterns. Further, the rowcombining component can create at least one decoding matrix / graph to represent the punctured code based on the combined rows. In addition, a selection component can select a decoding matrix / graph from the created at least one decoding matrix / graph that does not contain a girth-4 cycle.

A projection screen and a method for manufacturing the same providing clear images regardless of the brightness of the environment where the projection screen is used. A projection screen according to the present invention is a projection screen (1) for displaying an image by projecting light from a light source (11). The projection screen (1) includes an optical thin film (3) composed of dielectric multilayers having high reflectance for light in particular wavelength ranges and high transmittance for at least visible light except the light in the particular wavelength ranges. The thickness of each of the dielectric multilayers composing the optical thin film (3) is determined by simulation based on a matrix method. With the thus constructed projection screen of the invention, the optical thin film (3) serves as so-called a band-pass filter. More specifically, the optical thin film (3) functions as a band-pass filter which reflects light of the particular wavelengths and substantially transmits the light except the light of the particular wavelengths, thereby separating incident light.

A system and method of receiving orders, placing orders in an order matrix, determining potential production periods for an order, rescheduling orders, and generating a bill of materials. The method receives an order having one or more tokens out of a set of possible tokens. Each token is a combination of a characteristic and a value of the characteristic. The orders are placed in an order matrix. An order restriction matrix for the orders is generated based on certain selection conditions. The method then examines the restrictions that apply to the order and derives an order derived production restriction matrix for the order, which is evaluated to determine possible production periods for the order. The order matrix may also be used to generate a bill of materials.

Disclosed in the invention is a running state evaluation method of an urban distribution network. According to the method, with combination of actual investigation and expertise, single indexes capable of reflecting a running state of a distribution network comprehensively are selected by following the principles of objectivity, high accuracy, mutual independence, and high operability in a perspective of system engineering; superior indexes which the single indexes belong to are defined based on an analytic hierarchy process method, and an overall and complete index system is established and so on; a scoring formula of the single indexes is determined based on combination with the correlated industrial standard and the expertise by using a fuzzy membership function, and weight factors of all indexes are determined by using a pairwise comparison matrix method; and with running data collected by other systems of the distribution network automatically, scores of all indexes are calculated and then a running state evaluation score of the whole distribution network is provided.

The invention discloses a method for analyzing the shafting torsional vibration of a turbo-generator set, which belongs to the technical field of power and large rotating machinery manufacture. The method comprises the following steps: firstly, segmenting a shafting body, and determining the external diameter, internal diameter and length of each shaft segment; secondly, calculating equivalent parameters of a shafting, including the rotation inertia and stiffness of each shaft segment; thirdly, calculating the rotation inertia of blades by finite integration technique; fourthly, modeling the shafting of which the shafting body is segmented into a concentrated mass block-spring model; fifthly, calculating the external torque of a shafting torsional vibration model; and finally, calculating shafting torsional vibration response by a Newmark-beta method and a Riccati increment transfer matrix method. The method takes non-linear factors into account during the analysis of shafting torsional vibration, and avoids the influences of the change of torsional vibration patterns with time and space on an analysis result.

The invention discloses a fault-tolerant control method for a networked control system with time-varying delay. In view of conditions of parameter perturbation, time-varying delay, external disturbance and random failure happening to an actuator, a discrete time closed-loop nonlinear networked control system model is firstly built, a Lyapunov-Krasovskii function with the delay information is then built, a Lyapunov stability theory and a linear matrix inequality analysis method are used, sufficient condition for asymptotic stability of the nonlinear networked control system and existence of an H-infinity fault-tolerant controller are obtained, a Matlab LMI toolbox is used for solution, and a gain matrix for a non-fragile fault-tolerant controller is: K=K<->P; and conditions for optimizing the minimum disturbance rejection rate gamma is given, and the controller gain matrix K<*> optimized under the minimum disturbance rejection rate gammamin= square root of e is acquired. The condition of time-varying delay existing in the system is considered, the time-varying delay is analyzed and processed based on a free-weighting matrix method, and the conservation is reduced.

The invention discloses a security risk early warning measurement and judgment method of foundation pit tunnel engineering. According to the practical monitoring data of each monitoring program of the foundation pit tunnel engineering and various influence factors including an early warning factor, an early warning amount and the like of each monitoring program, mining analysis is carried out through methods including hierarchy analysis, fuzzy comprehensive evaluation and the like, a security state discrimination or risk prediction matrix method under various influence factors is established, a security risk or early warning situation of the engineering is calculated and judged, the oneness, the subjectivity and the retardance of the security risk early warning level discrimination of the engineering are overcome, the information construction, the security risk dynamic control, the early warning, the response and the disposal of the engineering can be effectively guided, the scientificity, the rationality and the standardization of the security risk early warning of the engineering in the foundation pit tunnel engineering can be realized, and the security risk precontrol and management level of foundation pit tunnel construction is improved.

The invention belongs to the technical field of power system dispatching automation, particularly relates to a robust scheduling method considering uncertainty of wind power and load prediction, whichcomprises the following steps of: describing the correlation between input load fluctuation and a prediction error of wind power output by using a correlation coefficient matrix method, and converting random variables with correlation into mutually independent random variable matrixes by using a Cholesky decomposition method; Constructing a probability density model of prediction errors of wind power output and load fluctuation by adopting non-parameter kernel density estimation; Introducing the direct-current power flow model into a power system dispatching model, and establishing an objective function and a constraint condition under the condition of uncertain factors by taking the minimum total dispatching operation cost of the system as an objective function of the model; adopting Benders decomposition method to solve a UC main problem of a robust SCUC problem, a network security check sub-problem of the UC main problem under a basic scene, and a network security check sub-problemunder an uncertain scene of new energy power generation and load.

The invention discloses a fast digital image stabilization method applicable to a space robot visual system, and relates to fast digital image stabilization technologies. The fast digital image stabilization method includes the five steps of image preprocessing, local motion estimation, global motion estimation, motion filtering and motion compensation. The feature point extraction and matching can be carried out on a front frame of image and a back frame of image rapidly and accurately through an ORB feature point extraction algorithm on the basis of image preprocessing, and the advantages in time and accuracy are achieved; global motion vectors can be solved accurately according to a Hauss Herder transformation method and an extended matrix method after a matching point pair is obtained, and a foundation is laid for later motion filtering and motion compensation; random jitter motion components can be kept according to a damping coefficient method, and normal scanning components are eliminated; positions of pixel points of a single frame of image are adjusted by the utilization of linear combination of the inter-frame global motion vectors so as to obtain a stable video image sequence. The fast digital image stabilization method is low in time complexity and high in prediction accuracy and compensation accuracy.

The invention discloses a method for accurately computing unloaded cable shapes of suspension bridges with spatial cable planes. The method includes steps of setting preliminary deviation quantities;solving tangent points and horizontal force of various span main cables at main cable saddles at the moment; solving the difference delta H of horizontal force of mid-span and side span of the main cables under the preliminary deviation quantities; outputting the preliminary deviation quantities and the unloaded cable shapes under the preliminary deviation quantities if the delta H is smaller thanpermissible error values, or correcting the preliminary deviation quantities of the main cable saddles by the aid of influence matrix processes according to difference values and repeatedly carryingout the first, second, third and fourth steps until errors are smaller than the permissible error values. The method has the advantages that the method actually includes internal and external double-layer circulation, the tangent points of the various span main cables and the main cable saddles under the preliminary deviation quantities are solved by means of the inner-layer circulation, the preliminary deviation quantities are solved by means of the outer-layer circulation according to unbalanced force under the preliminary deviation quantities, only a single unknown number is available in each layer of circulation, and the method is excellent in solving efficiency and precision by the aid of the influence matrix processes under the condition that completed bridge tangent points are selected by initial values; correct results can be quickly solved by the aid of the method regardless of suspension bridges with parallel cable planes or the suspension bridges with the spatial cable planes.

The invention discloses a multi-plane dynamic augmented reality registration method based on a homography matrix, which belongs to the field of computer augmented reality application, and mainly deals with the coordinate mapping relation between the real world and the virtual world. The method comprises the following steps: firstly, utilizing color information and shape information to automatically perform the initial coordinate mapping relation; then carrying out dynamic virtual environmental registration according to the real-time homography matrix calculation; and finally triggering relocation registration according to the shape information. The invention is characterized in that three-dimensional registration is realized by automatically recognizing the known positions in the real environment according to the special attribute of scene features, thus manual operation is not needed for realizing initialization, and automatic initialization is realized; and in terms of the problem that the homography matrix method can realize three-dimensional registration only on the plane of the physical world, the method of the invention utilizes the color information and the shape information to carry out multi-plane dynamic augmented reality registration.

The invention provides a method for extracting structured light strip center based on ridge tracing and Hessian matrix which belongs to the machine visual technique field. The method has aim for solving problem that the present method for extracting structured light strip center can not give attention to high precision and high speed. The method includes steps as follows: selecting a reliable tentative tracking point; solving sub-pixel grade precision light strip center point on a normal direction of the tentative tracking point by using Hessian matrix, rounding coordinates of the sub-pixel grade precision light strip center point and obtaining the present center tracking point; solving tangent of the center tracking point by using Hessian matrix, extending the center track point on the tangent direction according with a pixel step length and rouding for obtaining next tentative tracking point; repeating upper steps and solving all sub-pixel precision light strip center points in the light strip image. The method and the device provided by the invention has advantages of little processing image count number in ridge tracing method and high precision in Hessian matrix method, which can realize extracting the structured light strip center with high precision rapidly.

The invention discloses a network topology analysis method for a power system. The method carries out the network topology analysis by solving an equation AX=B which takes an adjacency matrix A as a coefficient matrix; subsequently, element elimination is carried out to the adjacency matrix A; according to the element elimination result, the right vector B is evaluated and the solution X of the equation is obtained by back substitution. When the bus analysis is carried out, the value of element x of a solution vector X is the bus number of the node i; and when the electrical island analysis is carried out, the value of the element x of the solution vector X is the electrical island number of the bus i. The method has small calculation amount as the coefficient matrix A is Boolean quantity, the right vector B is natural number and the back substitution process only contains simple logic judgment and evaluation. The method has the advantages of clear concept of the existing matrix method and simple programming, quicker running speed than the existing matrix method, less calculation amount than the matrix method which solves the full turnon matrix with the square of the matrix by 1 / (3n), and less memory space occupied in the computer.

The invention provides an anti interference method of satellite navigation based on air time frequency architecture, combining the characteristics of an array antenna and an adaptive signal processing technique. The signal received by the array antenna is processed as a baseband signal. The baseband signal is processed for beamforming by the blocking matrix method to form a new digital baseband signal. Then the new digital baseband signals are processed by means of interference suppression, anti-interference processing, digital conversion and digital-to-analog conversion frequency processing. The anti interference method of satellite navigation based on air time frequency architecture suppresses narrowband signals, improves free degree of anti-interference processing, beneficial to improve the whole anti-interference ability. And the anti interference method of satellite navigation based on air time frequency architecture can be implemented on hardware platform such as FPGA, and can be applied to high dynamic scenes, such as on-board, airborne, etc.

The invention discloses a mechanical arm modeling and solving method based on improvement of a multi-body system transfer matrix. The method is characterized in that a discrete time transfer matrix method of the multi-rigid-body system is improved according to the structure characteristics of a planar mechanical arm and the relation between motion transfer and force transfer, a unified model of an n-degree-of-freedom series mechanical arm is built, and kinematic and dynamic solving method and process of a system model is provided by setting the boundary condition according to the two acknowledged motion conditions between the joint space and the operation space of the mechanical arm. The method has the advantages of being flexile in modeling, small in calculation scale, capable of covering the kinematic and dynamic characteristics of the system and more effective compared with the traditional robot modeling method, showing the excellence of the new method, and achieving the aims of clear idea, simple programming and achievement easiness.

Methods and compositions are provided for the treatment and repair of defect in the cartilage in partial- or full-thickness defects in joints of animals, in particular humans. To induce cartilage formation, a defect in cartilage is filled with layers of thin flaps of synovium or of peritendineum, which contains chondro- and osteo-progenitor cells, with interposed layers of a matrix. The matrix contains a chondrogenic factor, which induces chondrogenesis of chondroprogenitor cells in the flaps, and an anti-hypertrophic agent, which arrest differentiation of chondrocytes in an early phase, in an appropriate delivery system. The matrix filling the bone area of a full-thickness defect may contain an osteogenic factor, which induces osteogenesis of osteoprogenitor cells. The layer of a flap between cartilage and bone areas may work as a barrier, which prevents blood vessels and associated cells from penetrating from the bone area into the cartilage area. To promote the induction of chondro- and osteo-genesis of the progenitor cells in the flaps of synovium or peritendineum effectively, the flaps may be treated with enzymes, e.g., matrix metalloproteinases or be punched by a needle before filling a defect.

The invention discloses a multi-modal process fault detection method based on a local neighbor standardization matrix, and relates to an industrial process fault detection method. The method enables historical data at a normal state to serve as a training set of modeling data, and carries out multi-mode process modeling and fault detection through employing a local neighbor standardization matrix method. The method comprises the steps: carrying out the preprocessing of unequal-length batch data through employing a local weighting algorithm, determining the maximum retainable length of the unequal-length batch data in the training set, and reconstructing lost data points of the unequal-length batch data through weighing and k-neighbor information; constructing a main local neighbor standardization matrix for an equal-length training set, carrying out modal clustering through employing a K-means algorithm, and eliminating off-cluster samples at all modals through employing a local off-cluster factor method. The method can prevent information loss from affecting the modal clustering effect of a multi-modal process, eliminates off-cluster points, and enables the fault diagnosis result of a multi-modal intermittent process to be more accurate through the construction of the main local neighbor standardization matrix.

The invention discloses a Laplace cutout matrix method by using a moving least square method. The Laplace cutout matrix method by using the moving least square method uses a KNN neighbourhood to replace a space neighborhood, a linear relationship of non-neighborhood pixels on an alpha chart is acquired, the moving least square method is used for replacing a least square method, a moving Laplace matrix is calculated, and an alpha chart is obtained. The cutout Laplace matrix calculation method is improved, the moving least square method is used for replacing the least square method to deduce the moving Laplace matrix, and compared with the least square method, the moving least square method solution linear condition is more accurate. The KNN neighbourhood is used for replacing the space neighborhood, the Laplace matrix can reflect the relationship of alpha values of the non-neighborhood pixels, and a more accurate cutout Laplace matrix calculation method is obtained.

The invention discloses a method for setting the best distance between one-way matched roads, relative city traffic system managing technique, and traffic simulating technique. Wherein, it comprises following steps: 1, attaining the original data of one-way traffic network; 2, building relative project; 3, using VISSIM software to build simulating network; 4, according to actual traffic condition, selecting the evaluation standards in VISSIM software on vehicle, road, cross, and the whole road network, and building the evaluation standard database; 5, operating the VISSIM software to record the traffic simulated result; 6, based on said result, using matrix method to analyze the evaluation standard data; 7, building comparing matrix, calculating the weight of standards, checking the consistency of comparing matrix, and calculating integrated evaluation standard to find the sequence of several one-way traffic matched road distance methods; 8, finding the best distance of one-way matched roads.

Provided is a network risk assessment method based on the combination of a Bayesian algorithm and a matrix method. The network risk assessment method based on the combination of the Bayesian algorithm and the matrix method comprises the steps of researching network assets and assessing asset value, researching and collecting network threats, scanning system bugs and collecting system vulnerability, assessing occurrence frequency of threats, assessing severity of the vulnerability, combining the Bayesian conditional probability computational formula with the matrix algorithm, thus a factor for judging the severity of risk events is added, namely the probability of occurrence of the risk events brought by internal node relevance, the precision of assessment results of the risk assessment method is improved. When the network risk assessment method based on the combination of the Bayesian algorithm and the matrix method are used for analyzing risks in the network, the relevance of network nodes are taken into consideration, an adjacent deceive of the device is used, and then the conditional probability of risk events caused by attacks on the device serves as a factor of weighing for calculating the severity of the device risk, thus precision of analysis result is improved, and the actual guiding significance of method assessment results to network security protection is promoted.