44results about How to "Simple physical structure" patented technology

The invention relates to a device and a method for on-orbit monitoring of charging of a satellite material surface, belonging to the technical field of space application. The device comprises an electron gun, a non-contact potentiometer probe, a three-dimensional transmission mechanism, a non-contact surface potentiometer, an electron beam current density measuring system, a monitoring electrode,a supporting structure, a first electromagnetic valve, a second electromagnetic valve, a diffusion pump, a third electromagnetic valve, a vacuum box, a mechanical pump, a vacuum penetrating wall, a measurement circuit interface and a measurement circuit. The test method comprises the steps as follows: sending an electron to a sample for monitoring the electrode surface under a vacuum condition, adjusting the position of the non-contact potentiometer probe through the three-dimensional transmission mechanism, recording charging potential Vsurface on the sample surface, measuring leakage current I through the measurement circuit, and finally obtaining a proportional relation coefficient K by known sample resistance rho according to the formula that Vsurface is proportional to KrhoI. According to the invention, the on-orbit surface charging condition of the satellite material is inverted by monitoring the leakage current of the sample in a space environment, and the device and the methodhas the advantage of simple physical structure and is easy to carry in space.

The invention discloses an axial-mode cylindrical helical antenna. The axial-mode cylindrical helical antenna comprises a helical radiator, a medium supporter, a feed matcher, a grounding board and a radio-frequency (RF) coaxial connector, wherein the helical radiator is of a cylindrical shape which is formed in a manner that a copper pipe is sequentially and helically encircled rightwards, and a variable-lift-angle helical structure is formed in a manner that the helical radiator extends to the circumference of a cylindrical bottom face from the circle center of the bottom face along the radial direction and then extends along the axial direction in a rising manner; the medium supporter is fixedly arranged on the grounding board; the feed matcher is of an inverted-L-shaped microstrip structure and divided into a horizontal part and a vertical part; the starting end of the helical radiator is arranged on the horizontal part which is stuck to the upper surface of the medium supporter and supported by the medium supporter; the RF coaxial connector is vertically arranged on the grounding board, and the top end of an inner conductor of the RF coaxial connector is connected with the vertical part; and an outer conductor of the RF coaxial connector is connected with the grounding board. The axial-mode cylindrical helical antenna has the advantages of flexible design, simple physical structure, excellent antenna performance and wide application.

The invention discloses an underwater positioning method based on single acoustic beacon distance measurement; the method comprises the following steps: an underwater vehicle carries out slope distance measurement with an acoustic beacon in a fixed position via an underwater acoustic communication set at a fixed frequency, the acoustic beacon sends self depth to the vehicle, the vehicle combines the acoustic beacon and self real time depth so as to calculate the depth difference and horizontal distance between the vehicle and the acoustic beacon; secondarily, in a navigation process, the vehicle uses a compass and a Doppler tachymeter to obtain self accuracy course and speed, thus obtaining the accurate navigation locus of the vehicle in certain period; finally, the vehicle uses the rangefinding sequence and the curse as constraints, uses the acoustic beacon position as reference, and matches and positions a real time relative navigation locus in an acoustic beacon coverage area, thusdetermining the present position. An existing underwater acoustic positioning method has more elements, is complex in structure, high in cost, and a curse reckoning method has accumulated errors andneeds the start point position information in calculation; the underwater positioning method based on single acoustic beacon distance measurement can solve said problems.

A method of disabling operation of a disposable print module that has an ink reservoir and a plurality of ink ejection nozzles including unused nozzles, and that serves to be mounted on a base of a postage meter, the method including the following steps: forming, in a prior step, a residual ink level counter using a determined first group of the unused nozzles; determining the volume of ink consumed; destroying one of the unused nozzles of the residual ink level counter every time the print module is mounted on a different postage meter base; destroying one of the unused nozzles of ink consumed exceeds a predetermined ink level; and disabling operation of the print module when all of the unused nozzles of the residual ink level counter have been destroyed.

The invention provides a trusted computing system and method based on a trusted computing environment, and the system comprises a trusted hardware layer which comprises a CPU and an RPMB secure storage area; the TEE environment comprises a Trusted OS layer and a trusted root TA layer; the secure communication layer is used for realizing state switching and data exchange between the REE environment and the TEE environment through a secure message instruction provided by the CPU; the REE environment comprises a trusted firmware UEFI-BIOS module, a trusted bootstrap program Trusted Grub module, a trusted kernel Trusted Kernel module and a trusted client module from bottom to top; each module in the REE comprises a trusted base; and the application layer comprises various business applications. According to the trusted computing system and method based on the trusted computing environment, the production and manufacturing cost of a host can be saved, the physical structure of the system is simplified, the operational capability and the communication rate are improved, and maintenance and upgrading are facilitated.

The invention relates to an image encryption method, and particularly relates to a chaotic image encryption method based on area-preserving Baker mapping. The method has a simple process, the space-time complexity can be enhanced, the computer precision restriction problem can be solved, and the encryption algorithm complexity can be increased. Meanwhile, as the chaotic system of the invention adopts a quantum chaotic system which is more complex that a common chaotic system, in the quantum chaotic system, the addition of disturbing momentum enables the chaotic system to be better in aperiodicity and stronger in sequence randomness, and problems of a fixed point and a stable window existing in the common chaotic system can be improved and solved.

The invention relates to a data returning method and device, a terminal, an unmanned aerial vehicle and a readable storage medium. The method comprises the steps that a terminal receives a downlink control signal issued by an unmanned aerial vehicle according to a preset frame structure, the downlink control signal carries an instruction used for indicating the terminal to receive and analyze service data, and the terminal is in wireless direct connection communication with the unmanned aerial vehicle; Wherein the preset frame structure comprises a downlink control channel sub-frame for directly transmitting a downlink control signal, an uplink control channel sub-frame for directly transmitting an uplink control signal and a service channel sub-frame for directly transmitting service data; And the terminal sends a response to the unmanned aerial vehicle on a frequency domain resource corresponding to the uplink control channel subframe according to the downlink control signal, and receives service data directly transmitted by the unmanned aerial vehicle on the frequency domain resource corresponding to the service channel subframe. By adopting the method, the unmanned aerial vehicle can directly return the service data to the terminal, base station transfer is not needed, the physical structure is simple, and the robustness is high.

The invention discloses a heat shrink film manufacturing winding machine capable of being replaced without shutdown and a using method of the heat shrink film manufacturing winding machine, and relates to the technical field of heat shrink film manufacturing. The heat shrink film manufacturing winding machine capable of being replaced without shutdown comprises a bottom plate, a mounting plate and a driving motor are fixed to the top of the bottom plate, and two longitudinally-arranged rotating shafts are arranged between the front side and the rear side of the mounting plate in a penetrating mode. According to the heat shrink film manufacturing winding machine capable of being replaced without shutdown and the using method of the heat shrink film manufacturing winding machine, the two rotating shafts with the opposite rotating directions are arranged so that two winding rollers can be driven to achieve the reverse rotating effect, and one winding roller can achieve the winding effect on a heat shrink film; and when the thickness of the heat shrinkage film wound on one winding roller reaches the maximum value, an automatic cutting-off mechanism can automatically cut off the heat shrinkage film, so that the replacement effect of the winding rollers without shutdown is achieved when the heat shrinkage film is wound, and the winding efficiency of the winding machine on the heat shrinkage film is improved.

Disclosed is a programmable logic circuit control apparatus capable of managing data with various bit widths and data lengths, generated by various processes to be executed by a programmable logic circuit, with a simple structure. A module address memory section (4) stores data indicating addresses of modules or conditions for branching processes and jump distances page by page. A write address and a read address of an internal data memory (2) are also stored in a page where the address of a module is stored. A circuit control section (5) reads data of each page from the module address memory section (4), and, according to the read data, reads a module, reconfigures a programmable logic circuit and reads data of a next page, or performs jump. When the programmable logic circuit is to be reconfigured, the circuit control section (5) performs an operation of supplying a write address and a read address to the internal data memory (2).

The invention belongs to the field of automation control controlled by a PLC (programmable logic controller), and particularly relates to an intelligent granary control cabinet suitable for a granary and a use method of the intelligent granary control cabinet. The intelligent granary control cabinet comprises a circular inflation and air-conditioning unit, an intelligent ventilation unit, a grain condition detection unit and a safe warehousing unit, wherein the grain condition detection unit provides data support for the circular inflation and air-conditioning unit, the intelligent ventilation unit and the safe warehousing unit; a 1#PLC is arranged in the control cabinet, the 1#PLC analyzes and judges real-time data uploaded by PLCs of all the units, the units are actively coordinated to work in a matched mode, grain ventilation is not allowed and personnel are not allowed to enter the granary during circular inflation and air-conditioning operation, and at the moment, a granary door is automatically locked; and after the personnel enter the granary, the circular inflation and air-conditioning operation and the like are not allowed to be started, and at the moment, the program of the circular inflation and air-conditioning unit executes safety protection. Therefore, data sharing and mutual cooperation among the units provide guarantee for high-quality storage of grains in the granary and safe warehousing of personnel.