49 results about "Structure factor" patented technology

The invention provides an electromechanical coupling model-based shaped reflector antenna electrical performance prediction method. The method comprises the steps of determining a structure scheme of a shaped reflector antenna; building a finite element model of the structure of the shaped reflector antenna; calculating self-gravity deformation of the structure of the shaped reflector antenna; calculating impact terms of shaped surface error and feed source error of the shaped reflector antenna on antenna aperture field amplitude and phase position; calculating the electrical performance of the deformed shaped reflector antenna by using an electromechanical coupling model of the shaped reflector antenna; judging whether the result meets design requirements. The method can accurately analyze the influence of a gravity load on the structure of a shaped reflector antenna and achieve coupling analysis of the structure of a shaped reflector antenna and electric and magnetic fields. The method can analyze the influence of various kinds of structure error on working performance of an antenna, find out main structure factors, provide reasonable structure precision requirements according to actual requirements, shorten a development period and reduce development costs.

The invention provides a test method as well as a correction method and device for detection efficiency of a PET (positron emission tomography) system. The test method comprises steps as follows: using the PET system for first acquisition to obtain a first activity related factor affecting the detection efficiency; using the PET system for second acquisition to obtain a second activity related factor according to data obtained through the second acquisition as well as the first activity related factor; removing information affected by the second activity related factor and information affected by geometric distribution information of an acquired object from the data obtained through the second acquisition so as to obtain inherent crystal detection efficiency of a detector. Further, the inherent crystal detection efficiency of the detector is used for correction. The acquired data is subjected to adaptive correction in combination with geometrical structure factors and activity related factors on the basis of the obtained inherent crystal detection efficiency of the detector, so that normalization correction of the system is completed conveniently and accurately.

A method for characterizing ultrasound scatterers in a medium comprises receiving ultrasound data representing a region of interest comprising a plurality of scatterers in a medium, the plurality of scatterers including aggregates of the scatterers. The ultrasound data is modeled data using an effective medium theory combined with the structure factor model, the structure factor model defining the spatial organization and concentration of the aggregates. The modeled ultrasound data is compared to theoretical data obtained with the effective medium theory combined with the structure factor model. From the comparison, dimensional data of the aggregates of the scatterers and the volume concentration of scatterers in the medium is determined.

The invention relates to an arc-shaped core-pulling structure for a mold. The arc-shaped core-pulling structure comprises a large sliding block, a self-rotation cylinder and a rotary insert, wherein the self-rotation cylinder is arranged on the large sliding block and is connected with the large sliding block by a rotary shaft; the large sliding block is provided with an arc-shaped containing chamber; the rotary insert is arranged in the arc-shaped containing chamber and is connected with the large sliding block by a pivot; the self-rotation cylinder is provided with a telescopic shaft which is connected with the rotary insert by a pivot. The arc-shaped core-pulling structure has the beneficial effects that the transferring step of force between the components can be greatly reduced, and the self-rotation cylinder directly acts on the rotary core-pulling insert, so that the loss of the force can be reduced; the self-rotation cylinder can rotate by self and is omni-directional without the clamping phenomenon, so that the stability of the mechanism can be improved and further high-speed, high-quality and stable operation of the mold can be achieved; in addition, unstable structure factors in the production process of the mold can be controlled, the mold can be ensured to meet the mass-production requirement, and the quality of the mold and the stable movement of all the mechanisms can be improved.

The invention provides a cable type welding wire. The cable type welding wire comprises a center welding wire and n peripheral welding wires arranged around the center welding wire in a spiral rotating manner, wherein the diameter of each of the peripheral welding wires is d, and the neighboring peripheral welding wires are separately arranged in an intersecting manner. The cable type welding wire is characterized in that the lay length T of each of the peripheral welding wires is equal to K*m*d, wherein K is the structure factor of the peripheral welding wires, m is the lay length multiple, and d is the diameter of each of the peripheral welding wires; K is larger than or equal to 1, and less than or equal to 1.5; m is larger than or equal to 20, and less than or equal to 25. According to the cable type welding wire provided by the invention, wire breakage is not liable to generate in the manufacturing process; during welding, the peripheral welding wires are arranged compactly, so that the wire feeding process is more stable, and the welding performance of the cable type welding wire is improved.

The invention discloses an image identification-based vehicle load measurement method and relates to the field of vehicle load measurement. Stress and deformation of a steel plate spring is in a linear relation, a picture of a mark pasted on a side surface of the steel plate spring is shot by a camera, a circle center of the mark is obtained by image identification, the deflection of the steel plate spring is obtained by calculation, a load is measured according to the deflection, so that the actual load of the whole vehicle can be obtained. An image identification method is employed, and compared with other methods, the image identification-based vehicle load measurement method is very convenient to arrange; and with a non-contact mode, a vehicle structure is not damaged, the influence ofa site structure factor is very small, and subsequent loading is very easily achieved. The accuracy can be achieved by adjusting a camera position according to a demand, and measurement with relatively high accuracy can be achieved by debugging.

According to the invention, an incident X-ray is transmitted in a wide angular sector towards a sample of amorphous material that scatters back the X-rays. The method comprises: a step of storing experimental photonic intensity measures based on the incidence angle; a step of correcting the experimental intensity while taking into account at least the absorption phenomena within the sample based on the penetration length l of the incident wave inside the sample before reflection; a standardisation step of reporting the corrected intensity resulting from the experimental intensity to an electronic intensity according to a standardisation coefficient (Alpha); a step of calculating a discretised function Q.i ( Q ), i being a reduced intensity resulting from the measures of the corrected and standardised experimental intensity and Q being the module of the wave scattering vector proportional to the value sin Theta / Lambda, 2Theta being the scattering angle and Lambda being the length of the transmitted wave, the standardisation constant (Alpha) recursively varying in order to minimise the slope of the affine straight line (42) obtained by linear regression of the values of the function Q.i ( Q ), the reduced intensity values being calculated upon each iteration for a penetration length l, and the sought (41) function Qi ( Q ) corresponding to the minimum slope; and a step of determining the structure factor from the distribution of the radial atomic concentration Rho(r) based on Qi ( Q ).

The invention discloses a face recognition method based on structuralized factor analysis. The problem that the face recognition accuracy rate is low due to the fact that local clustering features and a global distribution structure of face image data cannot be kept in the prior art is mainly solved. The face recognition method comprises the achieving steps of 1 dividing a face image data set; 2 performing clustering analysis on all training sample data; 3 calculating an optimal feature projection matrix through Gibbs sampling; 4 extracting low-dimension features of all test sample data and the training sample data; 5 recognizing a face image. The face recognition method synthesizes the local clustering features and the global distribution structure of the face image data and improves the face recognition accuracy rate.

The invention relates to a method for calculating an orientation system structure factor in SAXS calculation. The method comprises acquisition: acquiring length-diameter ratios of scatterers subjectedto SAXS synchrotron radiation light source irradiation, determination: determining structure factor calculation formulas of different scatterers according to the length-diameter ratios and calculation: respectively calculating structure factors of the different scatterers according to the different calculation formulas. The invention also relates to a system for calculating an orientation systemstructure factor in SAXS calculation. The method and system can acquire more precise structure factors of scatterers of the more dense orientation system and provide good data support for the non-destructive detection of the effectively observed material mesoscopic scale structure based on small-angle X-ray scattering SAXS.