45 results about "Particle radiation" patented technology

The invention provides an SRAM (Static Random Access Memory) storage unit anti-single particle radiation reinforcement method and system, and relates to the technical field of microelectronics and circuit structure design, a redundant node coupled with a main storage node of an SRAM storage unit is constructed, and the redundant node is used for redundant storage of the logic state of the main storage node; the polarity of a main storage node is reinforced by configuring the main storage node into a circuit structure fully surrounded by a single-type transistor; wherein the redundant node and the main storage node after polarity reinforcement are integrated into a reinforced SRAM (Static Random Access Memory) storage unit. According to the method, circuit-level fusion and collaborative design are carried out on redundancy reinforcement and polarity reinforcement, so that the single event upset resistance of the SRAM unit is improved, and an efficient and enforceable reinforcement design method is provided.

A kind of anti-radiation reinforced SiC super-junction JFET structure and preparation method, from bottom to top are in order: drain metallization layer, N+ substrate layer, N buffer layer, P column region, N column region, P-base region, current expansion region, N+ source region, P+ gate region, isolation dielectric layer, gate metallization layer, source metallization layer.P column region and N column region are arranged alternately on the upper surface of N buffer layer, P column region is symmetrically arranged, and N column region is arranged between two P column regions.P column region and P-base region form a P-type doped region as a whole, and are connected with source metallization layer.Electrically conductive channel structure is formed between P+ gate region and P-base region, and the opening and closing of channel are realized by controlling the voltage on P+ gate region.The application effectively solves the problem of electric field concentration caused by high-energy charged particle bombardment in the device, reduces local high temperature, and greatly improves the anti-single-particle radiation capability of SiC JFET.

The present invention provides: a scintillator which is reduced in the intensity of the afterglow, while having increased luminous intensity; and a charged particle radiation apparatus. A scintillator according to the present invention is characterized in that: a base material, a buffer layer, a light emitting part and a first conductive layer are sequentially stacked in this order; the light emitting part contains one or more elements that are selected from the group consisting of Ga, Zn, In, Al, Cd, Mg, Ca and Sr; and a second conductive layer is provided between the base material and the light emitting part.

The invention relates to a gas supply device, a particle radiation apparatus, a method for operating a gas supply device, a method for operating a particle radiation apparatus, and a computer program product, the gas supply device having a first precursor reservoir for receiving a first precursor, a second precursor reservoir for receiving a second precursor, and a supply unit for supplying the first precursor in gaseous state and / or the second precursor in gaseous state onto a surface of an object. A first guiding device is arranged between the first precursor reservoir and the supply unit. A second guiding device is arranged between the second precursor reservoir and the supply unit. A first valve is arranged between the first guiding device and the supply unit. A second valve is arranged between the second guiding device and the supply unit. A control valve for supplying the first precursor in gaseous state and / or the second precursor in gaseous state is connected to the first valve, the second valve and the supply unit.

This invention provides a proton imaging method and imaging device, applicable to the fields of proton imaging technology and signal processing technology, particularly in the field of particle radiation imaging technology. The method includes: determining a virtual source position based on an initial two-dimensional dose distribution of a proton beam acquired without an imaging object; obtaining multiple sub-beam propagation paths from the virtual source position to the multiple predetermined sub-beam center positions based on the virtual source position and multiple predetermined sub-beam center positions on a predetermined plane; obtaining sub-beam data pairs corresponding to the sub-beam propagation paths and the two-dimensional dose distribution based on the two-dimensional dose distribution and the lateral distribution components determined along the sub-beam propagation paths; obtaining multiple water equivalent path lengths corresponding to at least one projection angle through an iterative algorithm based on the multiple sub-beam data pairs corresponding to at least one projection angle; and performing image reconstruction based on the multiple water equivalent path lengths corresponding to at least one projection angle to obtain a target image of the imaging object.

The invention relates to a powder delivery system for delivering a raw material powder to a device for producing a three-dimensional workpiece by irradiating a layer of the raw material powder by means of electromagnetic radiation or particle radiation. The powder delivery system comprises: a conveyor line designed to convey a flow of gas at least along a section and a flow of powder driven by the flow of gas at least along the section; and a conveying device designed to convey the gas flow through the conveying line. The powder delivery system further includes a first tank connected to the conveyor line for supplying the powder for the additive manufacturing process to the device; and at least one overflow vessel connected to the conveyor line for receiving excess powder accumulated during the additive manufacturing process. The powder conveying system further comprises a buffer container connected to the conveying line and used for supplying the powder to be screened to the screening equipment; and the screening equipment is used for screening the powder to be screened and distributing the screened powder. The powder delivery system includes an interface for an external tank connected to the conveyor line for introducing fresh or impure powder into the powder delivery system. The powder delivery system further comprises a controller for controlling the powder delivery system such that the system performs at least one of the following delivery processes: a. Delivering the screened powder into the first tank; b. Conveying the powder from the at least one overflow container into a buffer container; and c. Conveying the powder from the outer tank into the buffer container.

An apparatus (10) for producing a three-dimensional workpiece (46) by irradiating a layer of a raw material powder with electromagnetic or particle radiation comprises a process chamber (16) accommodating a carrier (12) and a powder application device (14) for applying a layer of a raw material powder onto the carrier (12). The apparatus (10) further comprises an irradiation unit (26) for selectively irradiating the layer of the raw material powder with electromagnetic or particle radiation in accordance with a geometry of a corresponding layer of the workpiece (18) to be produced. An absorption device (50) adapted to absorb thermal radiation emitted when the layer of the raw material powder is selectively irradiated with electromagnetic or particle radiation is arranged in the process chamber (16) and / or the irradiation unit (26) in a position such that the absorption device is able to absorb radiation occurring inside the process chamber (16) and / or inside the irradiation unit (26).

The application discloses a satellite orbit space environment disturbance coping method, equipment and computer program product. The method comprises the following steps: acquiring current position data and current space environment data of a target orbit, wherein the current space environment data comprises a first high-energy particle integrated flux at a target position of a high-energy particle flux and a first high-altitude atmospheric daily average atmospheric density; querying a second high-energy particle integrated flux at the target position of the high-energy particle flux and a second high-altitude atmospheric daily average atmospheric density when the target orbit environment is calm according to the current position data; calculating a high-energy particle radiation environment relative disturbance amount and a high-altitude atmospheric density maximum relative disturbance amount of the target orbit; determining a current high-energy particle radiation environment disturbance degree and a current atmospheric environment disturbance degree in combination with a disturbance degree discrimination range; and generating a risk coping suggestion. The application can accurately understand the disturbance situation of a spacecraft operating environment and improve the safety of the spacecraft in-orbit operation.

A particle alpha radiation sampler includes a scintillation cell, a Geiger counter for measuring the incidence of particle alpha radiation on the scintillation cell, a vessel defining a chamber, at least one inertial impactor, a filter, and a vacuum pump. The scintillation cell is configured to receive alpha radiation passing through air in the chamber from particulate matter collected on the filter. The inertial impactor is configured to allow passage of particles only at or below an established size threshold into the chamber. The filter is configured to collect particulate matter from the air in the chamber drawn through the inertial impactor. Finally, the vacuum pump is configured to draw air flow through the filter from the chamber and to draw air flow through the inertial impactor into the chamber.

In a method of operating an irradiation system (10) for irradiating layers of a feedstock powder with electromagnetic or particle radiation to produce a three-dimensional workpiece (110), it is determined, depending on the geometry of the respective layer of the workpiece (110) to be produced, whether a region of the layer (11) of the feedstock powder to be selectively irradiated with electromagnetic or particle radiation is affected by particulate impurities or substantially not affected by particulate impurities. When selectively irradiating a region of the layer (11) of the feedstock powder with electromagnetic or particle radiation, the energy density applied by the radiation beam (14a, 14b) to the region of the layer (11) of the feedstock powder is controlled in such a way that the energy density is higher in the case where it is determined that the region of the layer (11) of the feedstock powder is affected by particulate impurities than in the case where it is determined that the region of the layer (11) of the feedstock powder is substantially not affected by particulate impurities.

The apparatus (10) is an apparatus (10) for manufacturing three-dimensional workpieces, and includes a process chamber (12), a carrier (14) configured to receive raw material powder, an irradiation device configured to selectively irradiate electromagnetic or particle radiation onto the carrier (14) to manufacture a workpiece made from the raw material powder by an additive manufacturing method, a transmission element (18) configured to enable transmission of the electromagnetic or particle radiation irradiated by the irradiation device (16) into the process chamber (12), and a gas supply element (19) for supplying the process chamber (12) with a gas. a gas supply device (26) configured to supply gas (D) from the processing chamber (12) and having at least one gas inlet (28, 32); a gas exhaust device (34) configured to exhaust gas from the processing chamber (12) and having at least one gas outlet (36); and a flow capture (44) configured to capture gas containing particulate impurities in a flow capture region (46) located downstream of the transmission element (18) with respect to the direction of gas flow (D) entering the processing chamber (12) through the at least one gas inlet (28, 32).

The application discloses a primary side driving protection circuit and method, a pulse control circuit and a resonant converter. The primary side driving protection circuit comprises an abnormality detection circuit, which detects whether a rising edge loss and / or a falling edge loss exists in a lower tube driving signal output by a digital timing logic circuit through an analog delay circuit; and a logic reset circuit, which performs logic operation on an output signal of the abnormality detection circuit and outputs a reset pulse to control the digital timing logic circuit to reset. The application detects whether a rising edge loss or a falling edge loss exists in a lower tube driving signal output by a primary side digital timing logic circuit through an analog delay circuit, and controls the primary side digital timing logic circuit to reset in time through a logic reset circuit. Since the analog delay circuit and the logic reset circuit do not have a latch function, the application can resist space particle radiation or other unexpected interference, so that the LLC resonant converter can recover normal work in time and can be applied to the aerospace field.

The application provides a kind of lock phase loop single particle radiation sensitive node detection method, belong to lock phase loop technical field.It includes: according to double exponential current pulse mathematical model, single particle transient pulse current source model is obtained by using piecewise linear current source fitting;Single particle transient current pulse model obtained by piecewise linear current source fitting is injected into the node of lock phase loop circuit, and circuit simulation is carried out;According to the output change of simulation result of lock phase loop, determine the sensitive node in lock phase loop circuit that is susceptible to single particle effect.This application can determine the sensitive node in lock phase loop circuit that is susceptible to single particle effect and the degree of influence by simulation, and provide guidance for the direction of radiation hardening design of lock phase loop circuit.

The application provides a SiC MOSFET and a preparation method of the SiC MOSFET, which comprises, from bottom to top, a drain metallization layer, an N+ substrate layer, an N-drift region, a current spreading region, a P-well region, a second N+ source region, a second P-base region, a first P-base region, a first N+ source region, a gate oxide, a polysilicon gate, an isolation oxide, and a source metallization layer; the first N+ source region, the second N+ source region, and the P-well region are in contact with the source metallization layer; the second N+ source region surrounds the bottom, two corners, and one sidewall of a trench gate oxide; the second N+ source region is shielded by the P-well region and the second P-base region, and is isolated from the current spreading region and the N-drift region. The application effectively suppresses a strong electric field of the gate oxide caused by high-energy charged particle radiation, and greatly improves the anti-single-particle gate punch-through capability of the trench type SiC MOSFET.

Device (1) for producing three-dimensional objects (9) by successively solidifying layers of a build-up material (4), in particular a powder form, which can be solidified by means of electromagnetic radiation or particle radiation, at the locations corresponding to the respective cross-section of the object (9), comprising a carrying device for carrying the object with a height-adjustable support (6) arranged in a build-up chamber (5), an application device (11) for applying the build-up material (4), and an irradiation device (13) for irradiating the applied layers of the build-up material (4) at the locations corresponding to the respective cross-section of the object (9), wherein a build-up plate (7) is arranged on the support of the carrying device, which can be heated by means of a heating device (18), characterized in that the heating device (18) comprises a plate-like support (20),the upper side of which is provided with a recess (24) facing the building plate (7), in which a heating element (22) is floatingly mounted, the heating element (22) being formed by a heating plate (23) and heating rods (25) and the heating element (22) being supported at its edges by flexible insulating sealing elements (21).

The invention relates to a method for directly applying electric energy, wave energy or particle radiation. The invention relates to the technical field of used equipment, and discloses an acrylamide accelerated polymerization searchlighting device which comprises a device shell, five mounting blocks are fixedly connected to the top wall of the device shell, searchlights are mounted on the lower sides of the five mounting blocks, a conveying belt is mounted in the device shell, and eight receiving trays are mounted on the outer surface of the conveying belt. The sides, close to the conveying belt, of the eight material receiving discs are each fixedly connected with two fixing blocks, the two fixing blocks on each material receiving disc are fixedly connected with the conveying belt, the upper side of the device shell is fixedly connected with a feeding hopper, and scraping mechanisms are arranged in the eight material receiving discs and can move along with the material receiving discs. According to the material receiving disc, the material which is changed from liquid to solid in the material receiving disc is scraped, the material can be effectively prevented from being attached to the interior of the material receiving disc, smooth discharging is guaranteed, and waste of the material and cleaning work in the production process are reduced.

A detection system for analyzing particles is described. The detection system detects radiated light as a particle passes through a light beam and generates a waveform as a digital representation of the radiated light detected from the particle. The detection system performs a waveform regression analysis on the waveform to obtain coefficients for characterizing the waveform and assigns one or more characteristics to the particle based on the coefficients.

The invention discloses an FAPbBr3 organic-inorganic hybrid perovskite single crystal as well as a preparation method and application thereof, and relates to the technical field of organic-inorganic hybrid perovskite semiconductor materials. The method comprises the following steps: dissolving FABr and PbBr2 in a mixed solvent of N, N-dimethylformamide and gamma-valerolactone, so as to obtain a precursor solution of an FAPbBr3 single crystal; filtering the precursor solution to obtain filtrate; sealing the filtrate, preparing a single crystal by a reverse temperature crystallization method, and filtering the reaction solution as a mother solution after the reaction is finished; crystal grains are added into the mother liquor, standing is carried out for 48-96 h at the temperature of 20-27 DEG C, and the FAPbBr3 organic-inorganic hybrid perovskite single crystal is obtained. According to the invention, the utilization rate of raw materials is increased by 107.8% by establishing a mother liquor circulation crystallization mechanism. The method is simple in process and does not need special equipment, and the prepared single crystal can be applied to the fields of X-ray and Alpha particle radiation detection and the like.

The invention relates, inter alia, to a method for operating an apparatus (10) for producing three-dimensional workpieces (12) by subjecting layers of powder to electromagnetic radiation or particle radiation in a process chamber (14), wherein: the apparatus (10) has at least one powder conveying section (201, 202; T1, T2, T3) for conveyance and / or storage of a powder; the powder conveying section (201, 202; T1, T2, T3) has an inlet and an outlet; in an inertization step, an inert gas is fed into the powder conveying section (201, 202; T1, T2, T3) via the inlet and a gas mixture comprising the inert gas is discharged via the outlet; and an inert gas flow rate adaptation unit within the powder conveying section (201, 202; T1, T2, T3) is used to successively and / or continuously increase the flow rate of the inert gas and / or the flow rate of the gas mixture comprising the inert gas from a flow rate starting value, which is preferably 0 m / s, to a predetermined, preferably maximum, flow rate end value within a predetermined period of time.

The invention relates, inter alia, to a method for operating a device (10) for producing three-dimensional workpieces (12) by applying electromagnetic radiation or particle radiation to powder layers in a process chamber (14), wherein the device (10) has at least one powder conveying section (201, 202; T1, T2, T3) for conveying and / or storing a powder, wherein the powder conveying section (201, 202; T1, T2, T3) has an inlet and an outlet, wherein in an inerting step an inert gas is introduced into the powder conveying section (201, 202; T1, T2, T3) via the inlet and a gas mixture containing the inert gas is discharged via the outlet, wherein an inert gas flow velocity adjustment unit within the powder conveying section (201, 202;T1, T2, T3) the flow velocity of the inert gas and / or the flow velocity of the gas mixture containing the inert gas is successively and / or continuously increased from an initial flow velocity value, preferably 0 m / s, to a predetermined, preferably maximum, final flow velocity value within a predetermined time period.

In particular, as a preparatory step for a method for bonding one substrate to another, a method for surface treatment of a substrate (B) includes the steps of: preparing a substrate (B) having a bonding surface intended for bonding; treating the substrate (B) on at least a portion of the bonding surface to form an amorphous layer (C) having a first thickness (D1), preferably using primary particle radiation to form the amorphous layer (C); and reducing the thickness of the amorphous layer (C) to a second thickness (D2), more preferably (200).

This invention discloses a single-particle radiation hardening CMOS pseudo-resistor circuit, comprising: an adjustable CMOS pseudo-resistor circuit for generating an adjustable CMOS pseudo-resistor; wherein the adjustable CMOS pseudo-resistor circuit has a radiation-sensitive node located between the drain of a first transistor and the drain of a second transistor, the first transistor generating a current injected into the radiation-sensitive node, and the second transistor generating a current drawn from the radiation-sensitive node; a first balancing current mirror circuit for generating a discharge current when a single particle irradiates the drain of the first transistor, discharging the discharge current injected into the radiation-sensitive node to ground, thereby hardening the radiation-sensitive node; and a second balancing current mirror circuit for generating a compensation current when a single particle irradiates the drain of the second transistor, injecting the compensation current into the radiation-sensitive node, thereby hardening the radiation-sensitive node.

The application discloses a small celestial body density detection device and method based on cosmic rays. The small celestial body density detection device comprises a time flyer, the time flyer comprises a first time flyer and a second time flyer arranged along a first direction, and a mounting cavity is arranged between the time flyer and the second time flyer; a lead absorbing body is arranged for absorbing part of background particles; a radiation body is arranged for absorbing muons and radiating Cherenkov photons; a detection layer comprises a first detection layer and a second detection layer, and the first detection layer and the second detection layer are respectively arranged at two opposite side ends of the radiation body along the first direction; the Cherenkov photons projected on the detection layer form a Cherenkov light ring, and the detection layer is used for converting optical signals into electrical signals; and a collection and processing module is arranged for collecting the number of electrical signals and inverting the attenuation flux of muons.

The utility model relates to the field of medical instruments, in particular to a cervix uteri treatment support carrying radioactive particles, which comprises a tube body, a balloon, a particle support, a cleaning tube, a cleaning joint, a water injection tube, a water injection joint, a push rod and a lifting rod. According to the cervix uteri treatment support carrying the radioactive particles, the balloon and the bowl-shaped particle support are fixed front and back, so that particle radiation of the tube body and the particle support can conduct accurate treatment on a patient part, and radiation damage to other healthy tissue caused by dislocation, slippage, escape and the like can be avoided. The treatment support can be released once until the treatment course is finished without repeated release, so that the time of doctors is saved, the pain of patients is relieved, and the operation is simple, convenient and practical.

The application provides a radiation protection system based on a non-magnetic moment strong magnetic array. The system is a space radiation protection system, and can make magnetic domains in the material arrange or form a closed loop according to a certain magnetic freezing rule through fine magnetic circuit design, so as to magnetically lock the material in a certain area. Magnetic force lines are gathered on one side of the magnet, and weakened on the other side, so that a single-side strong magnetic field is obtained. Through a special arrangement and layout, a strong magnetic structure without a magnetic moment is realized. The strong magnetic array is attached around key components and devices of a spacecraft. On one hand, the strong magnetic array realizes strong magnetic shielding on high-energy particles under a specific energy threshold through comprehensive protection of the strong magnetic field and the mass. On the other hand, the strong magnetic array still has the non-magnetic moment characteristic, does not interfere with the satellite attitude control, and provides particle radiation protection.

This invention belongs to the field of radiative heat transfer technology, specifically relating to a method for obtaining the radiation characteristics of divergent suppressed particles. The calculation results of the absorption factor and scattering factor obtained by this method are in good agreement with those obtained by traditional Mie scattering calculations. When the shape factor increases to the point that traditional Mie scattering calculations diverge, the proposed divergent suppressed particle radiation calculation method does not diverge, effectively solving the divergence problem that occurs in traditional Mie scattering calculations when the shape factor increases. By introducing the divergent suppressed Riccati-Bessel formula and stepwise recursive calculations, the stable calculation of the absorption factor Qa and scattering factor Qs is ensured, avoiding divergence and thus improving the reliability and accuracy of particle radiation characteristic calculations.

This invention relates to the field of radiation heat transfer modulation devices, specifically to a structure for modulating near-field radiation heat transfer based on hyperbolic materials. The structure includes a substrate and nanoparticles, specifically MoO3 particles, disposed on the substrate. The substrate is made of MoO3. The hyperbolic polarized particle (HVPP) excited by the substrate provides an anisotropic heat transfer channel for inter-particle radiation heat transfer. The radiation heat transfer between MoO3 particles is modulated by rotating the substrate. This invention utilizes HVPP to establish an anisotropic radiation heat transfer channel and modulates near-field radiation heat transfer between particles by rotating the substrate. It was found that the excitation energy of HVPP in the substrate significantly enhances radiation heat transfer.

The invention provides a layout-level SRAM (Static Random Access Memory) chip single-particle radiation effect evaluation method, and relates to the technical field of microelectronic and spatial effect simulation analysis, the method comprises the following steps: establishing an SRAM chip three-dimensional stack structure model and carrying out heavy ion energy deposition simulation to obtain electron-hole pair three-dimensional space distribution; the area of the SRAM unit is determined based on layout information of the SRAM unit, an off-state NMOS device charge collection model is established, and drain charge transfer coefficient distribution is obtained through simulation; establishing a 6T SRAM unit circuit model based on circuit topology, and performing simulation to determine a turnover critical charge quantity; and integrating the distribution and the critical charge quantity to construct a charge collection calculation model, and predicting the overturning cross section of the SRAM array in combination with the area of a unit layout. According to the invention, efficient and accurate evaluation of the radiation effect in the chip design stage is realized.

A pipeline inline inspection system and method based on particle radiation detection imaging. The system comprises a radiation source (3) and a plurality of detectors (2); the plurality of detectors (2) are circumferentially and evenly distributed at intervals around the radiation source (3); the plurality of detectors (2) are respectively used for receiving, during inspection, a plurality of scattered particle radiations (6) formed after a plurality of incident particle radiations (5) emitted by the radiation source (3) are scattered by a pipeline wall (1) to be inspected.