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134results about How to "Reduce radiation intensity" patented technology

Distributed examination room radio cheating counter measure equipment

The invention discloses a distributed examination room radio cheating counter measure equipment, which comprises at least one examination room radio cheating counter measure central controller for detecting all radio signals within the frequency band of between 40 and 1,000 MHz in an examination room, capturing radio cheating signals, demodulating and decoding the radio cheating signals, authenticating contents of the radio cheating signals, extracting signal characteristic parameters and transmitting the signal characteristic parameters to an interference and blockage device; and the captured cheating information is stored and serves as an evidence and reported through a network. The distributed examination room radio cheating counter measure equipment comprises a detection module, a communication interface, a user interface and at least one examination room radio cheating signal interference and blockage device for receiving the cheating signal characteristic parameters sent by the central controller, forming an optimal interference style and an optimal strategy according to the parameters and producing and releasing radio interference signals. The examination room radio cheating signal interference and blockage device comprises an interference production module, a communication interface and a state management module.
Owner:北京国瑞维讯科技有限公司

Preparation method for preparing high-strength polypropylene foamed beads (EPP) with low irradiation intensity

The invention relates to a preparation method for preparing high-strength polypropylene foamed beads (EPP) with low irradiation intensity. The method comprises the following steps: 1, blending and granulating co-polypropylene with the melting point lower than 150 DEG C, glycidyl methacrylate (ether) and a stabilizer in a parallel twin-screw extruder; irradiating by high-energy electron rays; thenadding carboxyl-, or hydroxyl-, or amino-terminated long-chain structure substance, or carboxyl, or hydroxyl, or amino substance with two or more functional groups at the tail end as a chain extenderand other functional additives; extruding again by using double screws, carrying out water-cooling bracing granulation, drying, and foaming by using a physical foaming agent intermittent kettle methodto obtain the high-melt-strength polypropylene foamed beads (EPP). The processing process is green and pollution-free, and the structure of the materials are controllable; the random polypropylene foam material prepared by the method is low in VOC (volatile organic compound) content, pressure-resistant, buffering and heat-insulating, has excellent high strength, high resilience, shock absorption,energy absorption, heat resistance and oil resistance, is easy to mold and form, and can be widely applied to the fields of military industry, automobiles, buildings, children toys, food packaging materials, household appliances and the like.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1

Antiradiation pressure sensor

A radiation resistant pressure sensor consists of a silicon piezoresistive sensitive component and a metal shell, and the sensitive component consists of a silicon sensitive element with a Wheatstone bridge structure and a glass ring. A front end of the metal shell is provided with a stepped bore as a pressure opening; a periphery of a back-pressure face of the sensitive element is fixed on an internal ring surface of the stepped bore by the glass ring, and a pressure face of the sensitive element is conductively packaged flush with a front end face of the metal shell; a strain resistor on the Wheatstone bridge structure is connected with an internal lead of a gold wire, and the other end of the internal lead of the gold wire is connected to an output cable on a tail of the metal shell; the silicon sensitive element is formed by a monocrystalline silicon substrate; a silicon dioxide composite layer and a silicon nitride composite layer are sequentially formed on a front face of the monocrystalline silicon substrate and taken as insulating layers; the insulating layers extend to form four independent polysilicon layers as strain resistors; the peripheries of the insulating layers are exposed outside a ring edge of the monocrystalline silicon substrate; and the ring edge of the monocrystalline silicon substrate is fixed with the glass ring. The radiation resistance of the radiation resistant pressure sensor is improved by using the pressure sensitive component and the radiation resistant structure with radiation resistant reinforcement.
Owner:KUNSHAN SHUANGQIAO SENSOR MEASUREMENT CONTROLLING
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