30results about How to "No security threat" patented technology

The invention discloses a device and method for measuring the collision process in laser shock high-speed forming of plates, belonging to the field of measurement technology. The device includes a laser forming system and a measuring system. The laser forming system includes optical glass, laser, absorbing layer, metal sheet, metal round rod, barrier film, insulating paper and die; The thin plate and the metal round rod are not in direct contact. The metal sheet and the metal round rod are respectively connected to the positive and negative poles of the power supply. After the metal sheet is deformed by the laser shock and touches the metal round rod, the measurement circuit is turned on. The number of times the high-speed moving metal sheet collides with the metal mold, and the width of the voltage pulse is the time of collision contact. The method and device can accurately measure the collision process in the high-speed laser shock forming of the plate. The device of the invention has potential market application prospects.

The invention provides a channel self-adaptive method of a quantum key distribution system. The channel self-adaptive method comprises the following steps: at an initialization stage of the system, reducing attenuation, caused by a sending end, to signal light; increasing exit light intensity of the signal light; starting a system initialization process comprising delaying scanning and polarization feedback, so that the system initialization process is finished; after the system initialization process is finished, recovering the attenuation to the signal light to a single photon level corresponding to a default attenuation value; starting a quantum key generation process. The invention further provides a QKD (quantum key distribution) system based on the channel self-adaptive method of the quantum key distribution system. The channel self-adaptive method of the quantum key distribution system has the advantages that automatic estimation and channel attenuation compensation are carried out at the system initialization stage,, so that a method for properly increasing the signal light intensity is realized, the system initialization process can be smoothly finished, and the QKD process can be rapidly and effectively established. The method is good for networking operation of the QKD system, the working efficiency of the QKD system is improved, the operation stability and reliability are improved, and the whole performance of a QKD network is improved.

A facility vegetable cryoprotective agent is composed of glucose, choline chloride, naphthylacetic acid, chlormequat chloride, alcohol and water. The invention relates to a facility vegetable cryoprotective agent prepared by taking glucose, choline chloride, naphthylacetic acid and chlormequat chloride as active ingredients and has the characteristics of less components, low production cost and good freeze-proofing effect. Through field test, influence of low temperature of minus 3 to 5 DEG C can be effectively prevented. The invention has simple preparation, convenient use, labour and time saving and obvious effect, raw material components are not only cryoprotective agent but also vegetable nutrient substances, and the cryoprotective agent has no toxic hard on vegetables or safety threat on human body, thus being applicable to facility vegetable production in northern China.

The invention provides a coordinated control system and method of a train door and a platform door. The coordinated control system comprises an RFID system, a ZigBee wireless two-way transmission system, a PSL platform door local control system and a PSA platform door state monitoring system; the RFID system provides an enabling switching signal of in-place stable stop of a train; the ZigBee wireless two-way transmission system completes wireless two-way transmission of instruction sending of the train door and the platform door and state feedback receiving of the platform door; the PSL platform door local control system completes data collection and transmission of the RFID system and ZigBee wireless two-way transmission system, and control over the platform door; the PSA platform door state monitoring system completes operation recording of all events, failure state alerting, and monitoring and control of on-line parameter adjustment. The coordinated control system and method of the train door and the platform door have the advantages that cost is low, the construction period is short, the interface integration level is high, higher reliability and safety are achieved, and operation is convenient.

The invention discloses an induction heating equipment induction coil cooling pressure bearing system, which comprises a pressure vessel and a heating induction coil, the heating induction coil is arranged through the pressure vessel and includes an inner coil section located in the pressure vessel and an inner coil segment located in the pressure vessel The outer coil segment, the outer coil segment includes an exhaust coil segment and an intake coil segment, the heating induction coil has a cooling medium, the cooling medium is the same or similar gas as the pressurized gas of the pressure vessel, and the induction heating equipment induces The coil cooling pressure-bearing system also includes a first air pressure detection pipeline connected to the exhaust coil section and a second air pressure detection pipeline connected to the pressure vessel. The first air pressure detection pipeline and the second air pressure detection pipeline pass through the pressure Poor table connection. The induction coil cooling pressure bearing system for induction heating equipment aims to solve the technical problems that induction heating is difficult to apply to high-voltage and ultra-high-voltage equipment and has poor safety in the prior art.

The invention discloses a method of preparing a GaAs thin-film material. The method comprises steps as follows: using Ga 203, As 203 and activated carbon C as raw materials; adding absolute ethyl alcohol corresponding to 50-100% of solid raw materials in weight; after grinding the materials uniformly, using 10-15 MPa of pressure to press the materials into a sheet with thickness of 1-10 mm; then placing the sheet in a reactor corundum crucible; vacuumizing with high-purity nitrogen; permuting the reactor corundum crucible until oxygen concentration reaches a ppm level; then using mixed gas to vacuumize and permute the reactor corundum crucible once or twice; vacuumizing to 7-13 Pa; controlling a rate of temperature increase to be within a range of 5-10 DEG C per minute; heating a reaction zone until the temperature of the reaction zone rises to a range of 1200-1250 DEG C; heating a sediment zone until the temperature of the sediment zone rises to a range of 600-800 DEG C; keeping the temperature constant for 3-4 hours when vacuum degree is kept no less than minus 0.08 MPa; cooling naturally until the temperature drops to the room temperature after the temperature of the reaction zone reaches a predetermined temperature; and obtaining a grey black GaAs thin film after filling the reactor corundum crucible with the mixed gas. According to the method of preparing the GaAs thin-film material, used raw materials are simple, low in price, and easy to obtain, and the raw materials are either solid or non-toxic gas, are free from polluting the environment, and do not threat the safety of an operator.

The invention relates to a double-main-duct ultra-light type vertical take-off and landing solo aircraft which comprises a cabin main body and main ducts symmetrically arranged at the upper parts of the left side and the right side of the cabin main body, wherein the lower part of the cabin main body is provided with an undercarriage; each main duct is internally provided with a screw propeller, and an engine drives and rotates the screw propeller through a centrifugal speed reducer; and the engine is arranged at the lower part of the axis inside each main duct, and a nozzle of each main duct is further provided with a flow guide plate. Due to the use of the double-main duct aircraft provided by the invention,, the net weight of the aircraft is less than 116 kilograms, the height and the length of the aircraft are less than 1.9m, and the volume of the aircraft is equal to be about a half of the weight of a common car, so that the requirement on take-off and landing site is extremely simple, the aircraft is suitable for take-off and landing in the crowed cities, and the aircraft can be conveniently controlled.