13 results about "Scattering function" patented technology

The utility model provides a myopia prevention and control lens, which relates to the technical field of optical lenses, and comprises a lens body, a first optical area and a second optical area, the second optical area is composed of a plurality of ring mirrors with diopters; the first optical area and the second optical area are arranged on the lens body; according to the utility model, the first optical area composed of a plurality of optical devices with a scattering function and the second optical area composed of a plurality of ring mirrors with diopter are arranged, so that multiple optical signal stimulation is provided for the eyes of a myopic patient, and the myopic eye mask is suitable for myopic crowds insensitive to single optical signals, and meanwhile, the myopic eye mask is suitable for myopic people. Due to the fact that the out-of-focus ring mirror can provide continuous out-of-focus signal stimulation, visual fatigue of a wearer can be relieved, and the myopia prevention and control effect is improved.

The invention discloses a differential dynamic microscopic image processing method based on a root-mean-square error. The differential dynamic microscopic image processing method comprises the following steps: a sequence image acquisition step: acquiring a time sequence microscopic image; a sequence image processing step: obtaining a difference image data set; performing one-dimensional Fourier transform in two directions on the differential image data set in sequence to obtain two-dimensional transform result data, and calculating to obtain Fourier amplitude spectrum image data; an obtained data processing step: carrying out dimension reduction processing on the Fourier amplitude spectrum image data; introducing structure function fitting, calculating a root-mean-square error between a fitting curve of the data after dimension reduction processing and the Fourier amplitude spectrum image data, and selecting a data truncation point according to the root-mean-square error; and an intermediate scattering function is introduced, and dynamic information of Brown particles is obtained based on the relationship between the data after selection of the truncation point and the diffusion coefficient. According to the method, the data truncation point is determined through the root-mean-square error, so that the processing time is remarkably shortened while the measurement precision is ensured.

The application relates to a chemical short-range order measurement method and system based on an atomic pair distribution function, and the method comprises the following steps: performing a total scattering experiment on a polycrystalline powder sample to obtain total scattering data, a scattering function and an atomic pair distribution function; based on the total scattering data, an initial three-dimensional atomic structure model is constructed; further, the initial three-dimensional atomic structure model is fitted and reconstructed by taking minimization of a fitting goodness factor as a target, so that a three-dimensional atomic structure model after fitting and reconstruction is obtained; according to the three-dimensional atomic structure model after fitting and reconstruction, a radial distribution function and a bulk average distribution concentration are calculated, and a chemical short-range order parameter calculation cutoff is set according to a near-neighbor atomic cutoff distance; further, the probability of an atom finding other types of atoms under the calculation cutoff is calculated; and the chemical short-range order parameter is calculated based on the probability and the bulk average distribution concentration. Compared with the prior art, the application has the advantage of wide application scenarios.

The present application relates to a kind of multi-dimension gradual scattering light guide plate, processing method and backlight plate, and the light guide plate includes substrate layer and scattering function layer.Substrate layer and scattering function layer are closely adhered, and substrate layer and scattering function layer are respectively made of different light-transmitting material composite;Scattering structure is gradually distributed along at least two dimensions on the light guide plate, scattering structure penetrates substrate layer and scattering function layer, scattering structure is misaligned arrangement in adjacent column in plane, and misalignment amount is 1 / 2-2 / 3 of column spacing;Light guide plate includes light inlet end and light outlet end, in the direction of light outlet end towards light inlet end, the distribution density of scattering structure gradually increases, in the direction of substrate layer towards scattering function layer, the size of scattering structure gradually decreases.Scattering structure gradually increases along light inlet end to light outlet end density, gradually decreases along substrate layer to scattering function layer size, and misaligned arrangement in adjacent column spacing in plane, it is favorable to eliminate bright and dark stripe, let light emitting surface brightness distribution be more uniform.

This invention relates to the field of shortwave antenna communication channel testing and modeling technology, specifically to a method for measuring the angular power spectrum of an antenna in a shortwave skywave scenario. The method includes: the receiver performing a two-dimensional equally spaced angular scan within a preset azimuth and elevation range; establishing an angular power spectrum measurement equation based on the received signal power, antenna pattern, and noise power channel, using the scattering function; convolving this equation with the pattern to obtain the angular power spectrum within a single path; discretizing the single-path received power matrix and antenna pattern matrix in two dimensions, and then performing zero-plugging expansion on each; converting the discretized single-path received power matrix and antenna pattern matrix into two-dimensional frequency domain matrices, and determining the frequency domain ratio between the received power matrix and the antenna pattern matrix mapped to the angular domain using time-delay Doppler domain parameters. This invention improves the accuracy of angular power spectrum measurement in shortwave skywave channels while reducing the dependence of traditional empirical modeling methods on a single propagation assumption.

The application discloses a hyperspectral backscattering function and scattering coefficient measuring device, and belongs to the technical field of backscattering function measuring devices. The device comprises a light source. The light emitted by the light source is divided into two beams of collimated light through a one-to-two optical fiber jumper wire. One beam of collimated light is introduced into a reference light flux detector through a first optical fiber. The other beam of collimated light enters a first optical window through a second optical fiber and irradiates a scattering body in a sample cell. The scattered light generated after scattering by the scattering body is introduced through a second optical window and transmitted to a scattering flux detector through a third optical fiber. The scattering flux detector is used for receiving the scattered light from the scattering body and performing spectral spectroscopy and array detection on the scattered light. The reference light flux detector is used for receiving the light flux from the light source introduced through the first optical fiber and performing spectral spectroscopy and array detection on the light flux. The application solves the problem that the existing water backscattering function and scattering coefficient measuring device can only detect the backscattering coefficient of water at several wavelengths.

The invention is suitable for the technical field of oil and gas geophysical exploration, and provides a shale geology and engineering double-dessert synchronous prediction method and system, and the method comprises the following steps: constructing a rock physical model which represents a shale skeleton brittleness index, a solid skeleton volume modulus and an organic matter elastic modulus; on the basis of the rock physical model, developing an in-well rock physical inversion method, and predicting a skeleton brittleness index, a solid skeleton volume modulus and an organic matter elastic modulus by using logging data; establishing a reflection coefficient formula by combining a rock physical model based on a scattering function theory; based on a Bayesian inversion framework and a multi-data assimilation set inversion method, in combination with a reflection coefficient formula, a pre-stack seismic inversion method is developed, and the above parameters are synchronously predicted by using pre-stack seismic data. According to the method, a new effective method can be provided for simultaneous prediction of organic matter enrichment characterization of geological sweet spots of shale gas reservoirs and brittleness evaluation of engineering sweet spots.

The utility model discloses a multispectral water body attenuation and forward small-angle scattering measurement device, which is characterized by comprising a light source, a scatterer and a water body attenuation and forward scattering luminous flux detection module, wherein the light source comprises N collimation lasers and a laser output gating module; each collimating laser is transmitted or reflected by the laser output gating module after being subjected to electric control time-sharing gating, and then outputs a single-wavelength collimating working light source in a time-sharing manner; the single-wavelength collimation working light source is scattered by the scatterer to form scattered light in different directions; the water body attenuation and forward scattering luminous flux detection module comprises a scattered light receiving and converging hyperbolic convex lens, an optical filter and an area array CCD (Charge Coupled Device); scattered light is collimated and converged to a radial optical filter through a scattered light receiving and converging hyperbolic convex lens, and scattered light signals are attenuated by the optical filter according to the attenuation amount of the radial optical filter in proportion and then are incident to a photosensitive element of the area array CCD. According to the utility model, measurement of multi-wavelength multi-angle forward small-angle volume scattering functions is realized.

This invention relates to shortwave communication technology, and particularly to a shortwave MIMO channel modeling method based on multi-domain coordination of time-space-frequency-polarization-angle. The method includes: constructing a nonlinear array of transceiver antennas; determining the geometric relationships of element spacing, element velocity, distance from the reflector cluster to the antenna, and reflector cluster velocity based on three-dimensional vectors; establishing a path transmission delay characterization mechanism jointly determined by propagation distance, the number of inseparable multipath paths, and time-difference statistical characteristics; decomposing the distance from the element to the reflector cluster into time-space stationary and non-stationary terms; establishing a polarization matrix and performing amplitude-phase weighting on multipath components with different arrival and departure angles; obtaining the existence and disappearance states of the path over time based on the reflector cluster probability model combined with Markov processes; incorporating the influence of antenna polarization on channel amplitude into the channel expression; and generating impulse response and corresponding scattering functions using the obtained angular power spectrum, delay domain model, and time-varying path state model. This invention improves the polarization adaptability of large-scale arrays to actual arrays.

The invention relates to a chemical short-distance ordered measurement method and system based on an atom pair distribution function, and the method comprises the steps: carrying out a total scattering experiment on a polycrystalline powder sample, and obtaining total scattering data, a scattering function and the atom pair distribution function; constructing an initial three-dimensional atomic structure model based on the total scattering data; further performing fitting reconstruction on the initial three-dimensional atomic structure model by taking minimization of the fitting high-quality factor as a target to obtain a three-dimensional atomic structure model after fitting reconstruction; according to the fitted and reconstructed three-dimensional atomic structure model, calculating a radial distribution function and a volume phase average distribution concentration, and setting chemical short-range ordered parameters according to a neighbor atom truncation distance to calculate truncation; further calculating the probability of finding other types of atoms under the calculation truncation of the atoms; and calculating a chemical short-range order parameter based on the probability and the volume phase average distribution concentration. Compared with the prior art, the method has the advantage of wide application scenes.

The invention belongs to the technical field of data processing, and particularly relates to a forest region microwave remote sensing earth surface dead combustible moisture content monitoring method and system, and the method comprises the steps: building a soil background scattering prediction model through historical time sequence data, and obtaining a soil background scattering coefficient in a current environment; constructing a dielectric and energy coupling balance equation considering the two-way attenuation effect, and introducing a moisture impedance attenuation function and a moisture gain scattering function; and constructing a residual target function according to the total backscattering coefficient observed by the satellite and the soil background scattering coefficient, and inverting the moisture content of the dead combustible matters on the earth surface by using a constrained interval search algorithm. According to the method, the soil background and dead combustible signals are decoupled, the problem that a traditional linear addition model loses efficacy in a humid environment is solved, and accurate monitoring of the moisture content of the earth surface dead combustible under the complex hydrothermal condition is achieved.

A method for dynamic modeling and manipulation of multi-object scenes is described. The method includes using object-centric neural implicit scattering functions (OSFs) as object representations in a model-predictive control (MPC) framework for the multi-object scenes. The method also includes modeling a per-object light transport to enable compositional scene re-rendering under object rearrangement and varying lighting conditions. The method further includes applying inverse parameter estimation and graph neural network (GNN) dynamics models to estimate initial object poses and a light position in the multi-object scene. The method also includes manipulating an object perceived in the multi-object scene according to the applying of the inverse parameter estimation and the GNN dynamics models.