How to Distribution function?

Edge orientation for second derivative edge detection methods,Calibration optical system based on geosynchronous orbit differential absorption spectrometer,Method for determining service life and reliability of high-temperature high-pressure component by utilizing ultrasonic

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In molecular kinetic theory in physics, a particle's distribution function is a function of seven variables, f(x,y,z,t;vₓ,vy,vz), which gives the number of particles per unit volume in single-particle phase space. It is the number of particles per unit volume having approximately the velocity 𝐯=(vₓ,vy,vz) near the position 𝐫=(x,y,z) and time t. The usual normalization of the distribution function is n(x,y,z,t)=∫f dvₓ dvy dvz, N(t)=∫n dx dy dz, where, N is the total number of particles, and n is the number density of particles – the number of particles per unit volume, or the density divided by the mass of individual particles.

Edge orientation for second derivative edge detection methods

ActiveUS20110222779A1Improve abilitiesEdge can be very thinImage analysisCharacter and pattern recognitionEdge orientationImproved algorithm

An improved algorithm for edge detection is provided that utilizes the second order derivative of the intensity distribution function of an image to provide edge orientation information for the detected edges. An exemplary embodiment of the improved algorithm includes determining the second order derivative of the intensity distribution function, identifying zero-crossings in the horizontal and vertical directions, assigning angle information to the identified zero-crossings in the horizontal and vertical directions; and identifying an edge orientation based the assigned angle information for the horizontal and vertical zero-crossing of the edge and adjacent edges.

Owner:ANALOG DEVICES INC

Calibration optical system based on geosynchronous orbit differential absorption spectrometer

ActiveCN109374547AHigh radiation energy utilization efficiencyFew mirrorsColor/spectral properties measurementsSolar lightPlane mirror

The invention discloses a calibration optical system based on a geosynchronous orbit differential absorption spectrometer. The calibration optical system is composed of an oscillating mirror system, afront optical system, a solar diffuse reflection plate assembly and a solar light blocking door assembly. The oscillating mirror system is composed of a pointing mirror, a sweeping shaft system, a motor harmonic group and an oscillating mirror U-shaped bracket. The front optical system consists of a primary mirror, a secondary mirror, a third mirror, a plane mirror and a slit. The solar diffuse reflection plate assembly consists of a Teflon diffuse reflection plate and corresponding structural components. The solar light blocking door assembly includes a solar baffle and a motor assembly. Thecalibration optical system introduces a bidirectional reflection distribution function of external solar illuminance with known spectral irradiance at suitable on-board calibration time, thereby accurately measuring the diffuse reflection plate and establishing an approximate lambertian surface source with known spectral radiance to provide known radiation input for a remote sensor. The system has high measurement accuracy, compact volume, light weight and high reliability.

Calibration optical system based on geosynchronous orbit differential absorption spectrometer

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Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Method for determining service life and reliability of high-temperature high-pressure component by utilizing ultrasonic

InactiveCN101509898ADetermine service lifeAnalysing solids using sonic/ultrasonic/infrasonic wavesProperty distributionState parameter

The invention discloses a method used for obtaining the service life and the reliability of a high-temperature high-pressure component by utilizing ultrasonic, belonging to the technical field of high-temperature component service life prediction. The method is characterized by comprising the steps of obtaining the ultrasonic velocity V1 in the material to be detected by using an ultrasonic apparatus; according to the ultrasonic velocity V1, obtaining a material damage state parameter Dv, and further obtaining a mean value * of the deviation of high-temperature permanent properties of the damaged material; and according to * is equal to A plus f (P (tr, T)) minus log (Sigma), calculating the service life tr of the component under the set temperature t and the stress Sigma, wherein A is a permanence property distribution parameter and obtained by the following formula: R is equal to Phi (A / s), wherein R is the selected reliability, Phi (A / s) is a normal distribution function, and s is distribution variance. The invention has the beneficial effects that the method not only can determine the service life of the high-temperature high-pressure component under the set reliability, but also can be used for determining the service reliability of the high-temperature high-pressure component under the set temperature, stress and service time.

Owner:DALIAN UNIV OF TECH

3 results about "Distribution function" patented technology

Edge orientation for second derivative edge detection methods

Calibration optical system based on geosynchronous orbit differential absorption spectrometer

Method for determining service life and reliability of high-temperature high-pressure component by utilizing ultrasonic

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