37 results about "Particle flux" patented technology

An oblique sputtering deposition apparatus is provided for preparing a thin film. A collimator having angled passages for filtering out particles from stray directions is placed between the substrate and the incident particle flux. The angle of the passages can be adjusted from about 0 to about 90° with respect to the substrate normal according to requirements. The oblique incidence of particle flux brings forms a column structure which is also angled.

The invention discloses a kind of method of measurement the solid particle three-dimensional density field in the gas and solid two phase flow, velocity field and equipment. The particle flux transmitting tube is laid at the front of high rate stereoscopic vision system which is consisted by the double look-out angle lens stereoscope and the high rate camera and the jet stream particle is refracted through the double look-out angle lens stereoscope mirror face and the single high rate camera target area can achieve the particle flux graphic with two different angles at the same time and after the graphic is input the computer a program module which is consisted by the pattern recognition algorithm procedure and three-inversion projection algorithm procedure treats the particle diagram and then get the transient three-dimensional density field. The program module treats series microsecond class time sequence changeable particle graphic and gets the particle three-dimensional movement trace and the velocity field. It is stabilize by using the single camera system and overcomes the problem of multiple camera system's constructer is complex and the synchronism is bad.

A highly basic particle flux for submerged arc welding that produces less than 7 ml/100 gr of diffusible hydrogen in the weld metal, which flux comprises a carbon dioxide containing compound with an effective amount of heat releasable carbon dioxide in the range of 0.5-3.5% by weight of the flux over 10% by weight of a low melting point compound and a binder.

The invention relates to a GaAs solar battery life predicting method under space radiation environment, belonging to the space environment engineering field and spacecraft solar battery array design field; the relation of non-ionizing energy loss and incident electron energy of electrons in the solar battery material is analog-commutated by utilizing a Geant4 software radiation transportation tool box, so as to obtain the relation curve of battery damage coefficient and displacement damage dose; particle flux energy spectrum of a GEO orbit and attenuation spectrum after penetrating through a quartz glass cover sheet are analog-commutated; a life predicting model of the solar battery is built under the GEO orbit radiation environment by utilizing the solar battery damage coefficient obtained by a ground simulation test and the displacement damage dose of a space orbit, obtained by analog commutation. In the invention, by utilizing the displacement damage dose method, the effect of different space radiation environment to the attenuation of the battery performance parameter can b predicted, so as to predict the in-orbit service life of the solar battery, determine the characteristic curve and save the test expense and time.

The invention provides a method for realizing wide nano-particle beams by using a neutral cluster beam nozzle assembly. The beam nozzle assembly is realized by using a beam clustering plate, namely an integrated beam gun, wherein the beam clustering plate is divided into two layers, the first layer comprises a plurality of nozzles of the integrated beam gun, the second layer comprises separators which are in one-to-one correspondence with the nozzles, the axes of the separators and the nozzles are on the same axis, and the distance between the two layers is in the range of 0.5cm to 5cm. The structure of the neutral clustering beam nozzle assembly can be used for nanometer fabrication of the nano-particle beams with relatively large areas and relatively high flux and realization of the relatively large-area nanometer spraying. The wide nano-particle beams with high particle flux realized by means of the structure are beneficial to increasing of yield in unit time when cluster beams are used for carrying out surface nanometer fabrication, reduction of energy consumption and improvement of efficiency, so that the unit cost of nanometer fabrication is effectively reduced.

The invention discloses an acoustic emission measurement method for particle parameters in a gas-solid system. The acoustic emission measurement method comprises the following steps: acquiring an acoustic emission signal generated when particles at any position in the gas-solid system impact a shielding type wave guide rod by utilizing the shielding type wave guide rod and a sensor; analyzing thereceived acoustic emission signal, and selecting time domain, frequency domain and state space parameters as characteristic values; and carrying out correlation modeling on the acoustic emission signal characteristic value and particle parameters in the gas-solid system to realize acoustic emission detection of the particle parameters. The defect that traditional acoustic emission detection can only be used for space average parameter detection is overcome, and measurement of the local particle movement direction, the local particle speed, the local particle concentration and the local particle flux in a gas-solid system and measurement of the particle flow pattern in the gas-solid system are achieved.

The invention provides a method for assessing a radiation dose rate of an earth-orbiting satellite. The method comprises the steps of step 101, by taking an actually measured spatial particle number in a period of time as a continuous dynamic input, calculating the depths of particles with different energy in a satellite structure material and energy deposition of the particles with the different energy in a device sensitive region material by adopting a particle transport calculation tool, and forming forms separately; according to a spatial flux spectrum of the spatial particle input and in combination with a depth relationship of the spatial particles in the satellite structure material, calculating a flux spectrum of the spatial particles in a target position; step 102, after the flux spectrum of the spatial particles in the target position is obtained, in combination with an energy deposition relationship of the spatial particles with the different energy in the device sensitive region material, obtaining an energy deposition surface density sum of the spatial particles in the device sensitive region material in the target position; and step 104, according to the energy deposition surface density sum and the density of the device sensitive region material, calculating the radiation dose rate of the spatial particles in the target position.

The invention provides a double-layer core-shell structure cast tungsten carbide particle weld wire and a preparation method. The weld wire comprises outer skin and a flux core. The flux core is formed in the manner that cast tungsten carbide is wrapped with carbon-rich sintered tungsten carbide, the carbon-rich sintered tungsten carbide is wrapped with nickel base layer core-shell structure tungsten carbide to form double-layer core-shell structure cast tungsten carbide particles, and the flux core is wrapped with the outer skin. The cast tungsten carbide particles are subjected to the surface carburizing technology, cast tungsten carbide, alloy powder and binder are mixed with carbon black and nickel powder and then heated at high temperature in vacuum, then heat preserving is carried out, the mixture is modified to form the double-layer core-shell structure, after modification, carbon-rich sintered tungsten carbide and a nickel base shell layer are formed on the exterior of the particles, the core-shell structure cast tungsten carbide particle flux core is obtained, and the flux core is wrapped with the outer skin to support the weld wire. According to the weld wire, while the tungsten carbide particles are refined, the cost is reduced effectively, the interface transition layer is additionally arranged, the hard tungsten carbide particles in a build-up welding layer do notfall off easily, and the hardness and the wear-resisting property of a cladding welding layer are effectively improved.

Provided herein is a system and method designed for measuring and recording, in three-dimensional space, an attenuation of cosmic-ray induced muon particle flux through a material. The attenuation of the said muons determines density variations in the said material in terms of their density, depth, shape and size. The muon data may be combined with various other data types. The passing muons are detected and recorded by one or a plurality of muon detection apparatus designed to be robust and shock resistant. If needed, each individual muon detection apparatus may be controlled remotely or automatically. The muon detection system may be powered by an energy storage device that may be recharged using renewable energy, aggregate or electric grid. The invention comprises methods steps allowing density characterisation of the material in various dimensions, including those over time.

The invention relates to a current feedback protection method and system for an electron multiplier, and the method comprises the steps: receiving, converting, amplifying and collecting an anode current signal of the electron multiplier, comparing the anode current signal with a rated safety current threshold value so as to control the output of a programmable logic controller (PLC), and generating a PLC control signal which is used for controlling a motor to rotate a circular disc with a hole, and circular holes with different areas are uniformly distributed in the disc in the circumferential direction to adjust the particle receiving area. The system comprises a sampling module, a control module and an adjusting module. The sampling module comprises a pre-amplifier and a data acquisition card; the control module comprises a computer and a PLC. The adjusting module comprises a motor and a circular disc with a hole. According to the invention, the anode current of the electron multiplier is detected, and the particle receiving area is changed in real time by using the thought of feedback control so as to control the flux of incident particles, so that the anode current is adjusted, and the electron multiplier is protected from being damaged under the condition that current approaching a safety threshold and overload current appear.

The invention relates to an electronic device soft error rate evaluation method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring a flux-energy spectrum of particles released by a packaging material of the electronic device; performing reverse analysis on the electronic device, and determining medium attribute information between an active area of the electronic device and the packaging material; determining a particle flux-effective linear energy transfer value spectrum of the electronic device in the active area according to the flux-energy spectrum and the medium attribute information; acquiring a single event effect cross section value-effective linear energy transfer value spectrum of the electronic device obtained by performing an irradiation test on the electronic device; and calculating the particle flux-effective linear energy transfer value spectrum and the single event effect cross section value-effective linear energy transfer value spectrum to determine the soft error rate of the electronic device. By adopting the method, the evaluation precision of the soft error rate of the electronic device can be improved.