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231results about How to "Reduce risk of exposure" patented technology

Real-time verification device and method for patient placement in radiation therapy

The invention relates to the technical field of patient location verification in a radiation therapy process, and particularly relates to a real-time verification device and method for patient placement in radiation therapy. The device comprises a first optical camera, a second optical camera and a third optical camera, wherein the first optical camera, the second optical camera and the third optical camera are arranged around a therapy bed. Each optical camera is arranged on a corresponding support. The first optical camera is arranged in front of the therapy bed. The second optical camera and the third optical camera are arranged on both sides of the therapy bed. Three optical cameras are connected with a video acquisition card through a video cable. The video acquisition card is arranged on a graphics workstation. A video calibration board is arranged on the therapy bed and corresponds to the head, the feet, the left side and the right side of a patient. The video calibration board acquires calibration images to calibrate the cameras. The graphics workstation uses an algorithm and software to control the cameras to realize the real-time verification of the patient placement. The device and method can realize accurate placement guide and verification of the patient, which greatly improves the accuracy of radiotherapy.
Owner:INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI

Multiple-nuclide gamma imaging system and method

The present invention discloses a multiple-nuclide gamma imaging system and method and belongs to the field of medical imaging. The multiple-nuclide gamma imaging system comprises a multiple-nuclide tracer injection module, a multi-nuclide scintillation crystal detector module, a configurable circuit module and an image reconstruction and imaging module. The multiple-nuclide gamma imaging method comprises the following steps: S1, starting the imaging system, setting acquisition time of the imaging system, and injecting 11C, 13N, 15O and 18F labeled compounds into an imaging object; S2, obtaining a decay event emission gamma pulse data set by positioning a gamma detector; S3, outputting an electrical signal (scintillation pulse) by a silicon photomultiplier; S4, conducting time discrimination, energy discrimination, data acquisition and coincidence processing by a detector; and S5, displaying images in a tomographic manner by a computer. The disclosed multiple-nuclide gamma imaging system and method can obtain more comprehensive data than the prior art, comprehensively analyze multi-molecule events and related influences, reduce requirements on the total gamma photon counting, reduce irradiation risks on organisms and improve a signal-to-noise ratio of reconstructed images.
Owner:NANCHANG UNIV

Secondary-side passive waste heat discharging system for ship pressurized water reactor

The invention relates to a secondary-side passive waste heat discharging system for a ship pressurized water reactor. The system comprises a safety shell, and a high-altitude water tank arranged outside the saftey shell and in a wall face of a ship body, and the system also comprises a reactor pressure container, a steam generator and a passive waste heat discharging condenser, wherein the steam generator is higher than the reactor pressure container in position, and a primary side of the steam generator is communicated with the reactor pressure container respectively by virtue of a main pipeline cooling section and a main pipeline hot section; the passive waste heat discharging condenser is soaked in a water source of the high-altitude water tank, and the bottom of the passive waste heat discharging condenser is higher than a liquid surface in the steam generator; and the passive waste heat discharging condenser is communicated with a secondary side of the steam generator respectively by virtue of a steam pipeline and a condensation pipeline. When a whole ship is in power failure, the waste heat of a ship pressurized water reactor core can be led out by virtue of the natural circulation of a system loop, the advantage of higher natural circulation capacity can be realized, and the safety, the reliability and the economic performance of the ship pressurized water reactor can be improved.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND

Magnetic sensor easy to encapsulate

The invention discloses a magnetic sensor easy to encapsulate, which includes four cantalevers, a cantilever anchor area, a first support pillar, a metal layer, a monox film and a silicon film, wherein the cantilever anchor area is fixed on the top surface of the first support pillar; the four cantalevers are crossed and fixed on the side wall of the cantilever anchor area; a circle of metal wire is arranged on the top surface of each cantilever; eight connection through holes are arranged at the cantilever anchor area and the first support pillar; the metal layer is connected with the metal wire through the connection through holes; the monox film is fixed on the top surface of the silicon film; the metal layer is fixed on the top surface of the monox film; the first support pillar is fixed on the top surface of the metal layer; eight bonding pads are positioned on the outer sides of the cantalevers; second support pillars are arranged between the bonding pads and the metal layer; connection holes are arranged in the second support pillars; and the metal layer is connected with the bonding pads of a sensor through the connection holes. The magnetic sensor is convenient to encapsulate, and reduces the influence of leading wires on the performance of the sensor.
Owner:SOUTHEAST UNIV

Culturing device for formaldehyde degradation bacteria

The invention belongs to the technical field of air purification equipment and particularly relates to a culturing device for formaldehyde degradation bacteria. A reaction tank which is of a box-type structure consists of a tank cover and a tank body; an air inlet pipeline reaches the bottom of the reaction tank through the tank cover; an aeration pump is arranged at the outer end of the air inlet pipeline; a swirl-mixing aerator is arranged at the inner end of the air inlet pipeline; a micro-porous biological filtering membrane is arranged at the end, close to the aeration pump, inside the air inlet pipeline; a temperature controller is arranged at the lower right part inside the tank body; a sampling hole is formed at the lower right part outside the tank body; a tail gas absorbing bottle is arranged in a central line at the top outside the tank cover; a tail gas pipeline is led out from the tail gas absorbing bottle, penetrates through the tank cover and then is provided with a tail gas collecting opening; a supplementing pipeline penetrates through the tank cover and then is provided with a valve and a supplementing opening in sequence. The culturing device is simple in structure, safe to use, convenient in preparation method, reliable in principle and low in cost, is capable of reducing the risk of exposure to surrounding people, and is applicable to screening, acclimatization and batch culture of formaldehyde degradation bacteria.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Internet of Vehicles system and method based on secret sharing and alliance chain

The invention discloses an Internet of Vehicles system and method based on secret sharing and an alliance chain. The system comprises a vehicle-mounted unit arranged on a vehicle, and an alliance chain server and an alliance chain client which form an alliance chain, wherein the alliance chain server side comprises an Endorser, a Committer and an Order, and the Committer is connected with the Order. Vehicle registration, secret key card issuing and authentication requests are submitted to an alliance chain server through an alliance chain client, only private keys of the alliance chain serverand the client need to be stored in secret key cards of the clients, and needed information is stored in alliance chain data. According to the invention, the blockchain architecture is applied to theInternet of Vehicles; a server private key and a vehicle ID are respectively stored in an alliance chain service in a distributed manner in a secret sharing manner; a traditional centralized server for centrally mastering user information is omitted, the outside cannot completely obtain complete vehicle ID information and server private key information, the information of a vehicle owner is not prone to leakage, and the anti-attack performance of the Internet of Vehicles system is further enhanced.
Owner:南京如般量子科技有限公司 +1

Treatment device for tritium gas and tritiated water

The invention provides a treatment device for tritium gas and tritiated water, which integrates catalytic oxidation of the tritium gas with collection of tritiated water together, and can be used as a tritium sampler. The device comprises a tritium gas catalytic oxidation working room and a refrigeration system, wherein to-be-treated exhaust gas containing tritium firstly flows through the tritium gas catalytic oxidation working room; under the action of a catalyst, the tritium gas is subjected to catalytic oxidation to generate tritiated water vapor; the tritiated water vapor enters into a convection chamber of the refrigeration system and is quickly condensed to generate liquid tritiated water; the liquid tritiated water is collected by a collector. The treatment device for tritium gas and tritiated water, disclosed by the invention, can be directly connected to a tritium gas circulating front end of a purification system for treatment of the to-be-treated exhaust gas containing tritium, and also can be connected to a tritium circulating middle part of a nuclear facility, in order to monitor tritium in the nuclear facility environment in real time by catalyzing, condensing and collecting tritium in the atmosphere; meanwhile, the device is further applicable to emergency treatment for high radioactive tritium gas and tritiated water in the nuclear accident field.
Owner:INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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