41 results about "Self shielding" patented technology

Provided in the present application are a self-shielding module and a communication apparatus. The communication apparatus comprises: a TRX board, at least one heat-dissipation structural member, and at least one self-shielding module, wherein a surface of each of the at least one self-shielding module comprises a metal shielding layer, the at least one self-shielding module is electrically connected to the TRX board, and the at least one heat dissipation structural member and the at least one self-shielding module are disposed on the same surface and / or different surfaces of the TRX board. The self-shielding module provided in the embodiments of the present application does not require a large-weight metal shielding cover, and does not require a large-sized enclosure frame; and a metal shielding layer can implement the signal shielding of power amplifier circuits, thereby making shielding modules of the power amplifier circuits miniaturized and lightweight, and increasing the effective layout areas of the power amplifier circuits.

The present application relates to a kind of high-energy X-ray multilayer nested shielding device, belong to CT technical field, solve the problem that the high-energy ray test needs to be carried out in shielding plant in prior art, and the space occupied is large and test site is limited.The present application includes: fixed shielding tube, mobile shielding tube and intermediate scanning tube;The fixed shielding tube is provided with two, and is first fixed shielding tube and second fixed shielding tube respectively;The mobile shielding tube is symmetrically provided with two, including: first mobile shielding tube and second mobile shielding tube;First mobile shielding tube and second mobile shielding tube are respectively slidably connected in the inside of first fixed shielding tube and second fixed shielding tube;The intermediate scanning tube is sleeved in the inside of the mobile shielding tube, and two ends of the intermediate scanning tube are respectively connected with first fixed shielding tube and second fixed shielding tube fixedly.The present application realizes the self-shielding of high-energy ray.

This application discloses a method, apparatus, electronic device, and storage medium for calculating fuel sphere burnup, relating to the field of nuclear reactor physics and thermal calculation technology. The method includes: dividing fuel spheres into multiple batches based on their distribution; establishing neutron transport equations for each batch of fuel spheres; calculating the self-shielding factor of each batch of fuel spheres; calculating the neutron flux density of each region of the reactor core using the homogenized cross section of the pebble bed region and the homogenized cross section of the reflector layer region; calculating the power density of each region of the pebble bed based on the neutron flux density of each region of the reactor core; calculating the neutron flux density and power density of each batch of fuel spheres at the current reactor core power level based on the neutron flux density of the pebble bed region and the self-shielding factor of each batch of fuel spheres; and calculating the burnup depth of the corresponding batch of fuel spheres based on the power density of each batch of fuel spheres at the current reactor core power level, thereby improving the technical accuracy of fuel sphere burnup calculation in non-uniformly packed pebble bed reactors.

The invention provides a cable GIS terminal type test device, so as to construct a mechatronics test platform integrating self-shielding environment simulation, multi-attitude working condition reproduction, adaptive electrical connection and built-in nondestructive testing, and a Faraday cage effect is formed through a metal cabin of the device to replace a special shielding hall. Safe switching of the terminal between a horizontal working condition and a vertical working condition is realized by utilizing the attitude driving mechanism, and a comprehensive solution for efficiently and accurately completing a cable GIS terminal full-project type test in a common environment is finally realized through the sensor and the self-adaptive electric connection assembly.

A mobile cable irradiation operation platform (11) and an electronic accelerator system. The mobile cable irradiation operation platform (11) comprises a platform base (111), a shielding device (112), cable winding / unwinding devices (113), and a cable guide wheel set (114); a moving device is provided at the bottom of the platform base (111); the shielding device (112) comprises a shielding wall body (1121), and the shielding wall body (1121) is vertically arranged at the rear part of the platform base (111); the cable winding / unwinding devices (113) are configured to load and unload cables (1131), and the cables (1131) on the cable winding / unwinding devices (113) are connected to the cable guide wheel set (114); the cable guide wheel set (114) guides the cables (1131) on the cable winding / unwinding devices (113) to the rear side of the shielding wall body (1121). The electron accelerator system comprises a shielding housing (21) and an electron accelerator; when the platform base (111) moves to an operating position, the shielding wall body (1121) and the shielding housing (21) define a shielding cavity, and an electron beam outlet of the electron accelerator is aligned with the cables (1131) at the rear side of the shielding wall body (1121) inside the shielding cavity. The mobile cable irradiation operation platform (11) can work in conjunction with a miniaturized electron accelerator to form a self-shielding structure, thereby greatly reducing the occupied space, facilitating installation, and improving production efficiency.

The present document describes techniques for a magnetically self-shielded speaker box for a mobile device. The speaker box described herein includes a thin metal enclosure, thereby reducing or eliminating plastic components from the exterior enclosure of the speaker box. The metal of the enclosure has a high magnetic permeability to prevent penetration of a magnetic field generated by the speaker transducer within the exterior enclosure. Also, the exterior enclosure includes at least two enclosure portions that are joined together with a continuous welded seam. Accordingly, the speaker box described herein is a thin-walled, fully metal, high-permeability enclosure resulting in a smaller, self-shielded solution that reduces both (i) the total physical volume of the speaker box for a given internal speaker back volume and (ii) the spacing requirements to adjacent voice-coil-motor auto-focus camera modules.

The invention relates to the field of wind power control optimization, and particularly discloses a wind power master control PLC anti-interference method and system based on a self-shielding filtering algorithm, which abandons the traditional thought of adding hardware, and uses a current feedback signal homologous with an interference source (variable pitch driver) as an original reference. The method is characterized in that the signal is not directly used, but a software-defined shielding layer is constructed through unique interference feature extraction and purification steps, and pure interference features capable of accurately representing noise are intelligently extracted from an original reference signal, so that a high-quality virtual noise reference is generated. On the basis, the adaptive filtering algorithm can accurately estimate and eliminate actual interference components from a main signal (a blade angle signal). According to the method, on the premise of not increasing any hardware cost and system delay, real-time and high-precision anti-interference protection on key control signals is realized by utilizing the existing data flow in the PLC.

The application provides a cable GIS terminal type test device to construct a mechatronic test platform integrating self-shielding environment simulation, multi-posture working condition reproduction, self-adaptive electrical connection and built-in nondestructive testing. The device itself forms a Faraday cage effect by the metal cabin to replace a special shielding hall. The posture driving mechanism is used to realize safe switching of the terminal between horizontal and vertical working conditions. Through the sensor and self-adaptive electrical connection assembly, the comprehensive solution of efficiently and accurately completing the full item type test of the cable GIS terminal in the ordinary environment is realized.

Disclosed in the present invention is an electron accelerator system for cable irradiation. The electron accelerator system comprises a shielding housing, an electron accelerator, a cable irradiation operating platform, and a shielding door body, wherein the cable irradiation operating platform comprises at least two take-up and pay-off devices and a cable guide wheel set; the shielding door body and the shielding housing form a peripheral shielding cavity; cables on the take-up and pay-off devices are guided into the peripheral shielding cavity by means of the cable guide wheel set; two first shielding bodies are provided on the front side of a rear shell of the shielding housing, and two second shielding bodies are provided on the rear side of the shielding door body; the first shielding bodies and the second shielding bodies form a central shielding cavity; and an electron beam outlet of the electron accelerator is arranged in the central shielding cavity, and the cables on the take-up and pay-off devices are guided to the position below the electron beam outlet in the central shielding cavity by means of the cable guide wheel set. The present invention can cooperate with a miniaturized electron accelerator to form a self-shielding structure, thereby achieving a better shielding effect; in addition, the cable guide wheel set has a longer service life.

The utility model relates to a self-shielding device for radiotherapy. The self-shielding device comprises an electronic flash therapy equipment base, the electronic flash therapy shell is rotationally assembled on the electronic flash therapy equipment base; the high-energy electron accelerator is arranged in the electron flash therapy shell and is used for providing pulse electron beams; the electronic flash therapy head is assembled at the end part of the electronic flash therapy shell, and the tail end of the electronic flash therapy head is used for irradiating the irradiation device; the irradiation device is located on the electronic flash therapy equipment base, and the guide rail is located between the electronic flash therapy equipment base and the electronic flash therapy shell and used for adjusting the position relation between the electronic flash therapy shell and the irradiation device; the electronic flash therapy head is ingenious in design and convenient to operate, the outer sleeve can move up and down along the inner sleeve, and animal fixing and electronic ray irradiation operation can be conveniently carried out.

The invention discloses a self-shielding coil design method based on a finite element method, relates to the technical field of high-precision magnetic field control, and solves the problems that when a compensation coil is designed in a closed magnetic shielding structure (such as a permalloy cylinder), the external stray magnetic field of the coil is coupled with the wall of the magnetic shielding cylinder to induce eddy current, so that the compensation magnetic field is distorted, and the background noise is increased. Meanwhile, high-precision magnetic field generation of a target area needs to be realized in a limited space. According to the technical scheme, finite element triangular mesh discretization is carried out on the surfaces of a main coil and a shielding coil; constructing a target function; and solving the minimum value of the function to obtain the optimal solution of the flow function psi of all grid nodes, calculating the current density of each triangular grid unit according to the optimal solution, and finally generating a closed-loop wire wiring structure of the main coil and the shielding coil along an equal-flow function line. The method is mainly used for scenes, such as a biological magnetic measurement system, magnetic resonance imaging and the like, which are limited in space and need to suppress external magnetic field coupling, and collaborative optimization of a high-precision target magnetic field and active self-shielding is realized.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

According to several embodiments, a high-frequency (HF) self-shielded inductor includes an outer shell having a dispersive or quasi-dispersive gap and two or more notches, an inner core disposed within the outer shell and having a dispersive or quasi-dispersive gap, coil windings disposed between the inner core and the outer shell, two end caps disposed at the opposing ends of the inner core and the outer shell, and a conductive shield disposed around the outer shell.

The invention discloses an effective ray shielding structure, and relates to the technical field of ray shielding. According to the effective ray shielding structure, through scientific material selection and structural design, harmful X-rays generated when an electron accelerator works can be effectively blocked, harm of the rays to a human body and the environment is avoided, it is ensured that the self-shielding electron accelerator operates in a safe environment, reliable protection guarantee is provided for the irradiation process, and the service life of the self-shielding electron accelerator is prolonged. According to the effective ray shielding structure, an iron material and a lead material are mixed for use, and a sandwich biscuit type structure of stainless steel plate-lead plate-stainless steel plate is innovatively designed, so that the advantages of high density and good shielding effect of lead are utilized, and the problems that the lead material is soft, needs to be supported and is difficult to process are solved through the stainless steel plate; meanwhile, compared with the single use of concrete or iron materials, the combination greatly reduces the thickness of the shielding structure on the premise of ensuring the shielding effect, and gives consideration to both cost and flexibility.

The application discloses basalt fiber and PVDF composite material and a preparation method of Ag / Fe3O4 synergic modification, Ag nanoparticles and Fe3O4 nanoparticles are simultaneously modified on the basalt fiber, and the limitation of traditional single modification function is broken; and the modified basalt is used to prepare oriented PVDF composite material, so that the prepared PVDF composite material realizes synchronous improvement of piezoelectric performance and electromagnetic shielding performance, and can be directly used as a structural material of equipment shell, cabin, automobile and the like, realizes intelligent structure manufacturing of self-sensing and self-shielding, and has good application prospect and economic value as a new type of PVDF composite material product.

The invention relates to a micro-ring filter based on a polymer cladding. The micro-ring filter comprises an upper cladding, a micro-ring filter and a lower cladding, the upper cladding layer is a PDMS (Polydimethylsiloxane) polymer; the lower cladding is made of silicon dioxide; the micro-ring filter comprises an input grating coupler connected with an input light source, and the input light source sequentially passes through the input grating coupler, an input conical waveguide, a straight-through waveguide and a straight-through end output conical waveguide and is finally output from a straight-through end output grating coupler; and the straight waveguide is matched with an annular waveguide. Through the complementary design of the negative thermo-optical coefficient of the PDMS upper cladding and the positive thermo-optical coefficient of the silicon core layer, the self-shielding of the micro-ring resonant wavelength to the external temperature change is realized.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

The application provides a battery-powered plug-in electromagnetic flowmeter, comprising a probe shell, an inner magnetic conducting rod, an inner magnetic conducting rod insulating plug, a winding and electrode isolation plug, a winding and electrode lead-out line cavity, a winding lead-out lining flat washer and a winding tail magnetic conducting plug. The application adopts a T-shaped tee structure to establish a self-shielding stable magnetic circuit, ensuring measurement stability; adopts an insulating film plating method on the surface of a magnetic material to realize pipeline insulation and reduce excitation current; increases a conversion drive from magnetization to constant magnetism, measurement and magnetic energy recovery, and monitors excitation current by using a single-chip component, realizes seamless transition of the excitation magnetization stage and the constant magnetism stage, reduces resistance consumption in the excitation process, realizes that excitation power consumption is reduced to 15-20 uA under the condition of positive-negative excitation period measurement in a 2-second interval, and high precision with an R ratio of 1:500 can be obtained. The application has the characteristics of simple structure, energy saving and strong stability.

The invention relates to the technical field of radio frequency signal receiving and transmitting equipment, and discloses a low-cost miniaturized digital intermediate frequency receiving and transmitting front end based on an SIP (Session Initiation Protocol) module, which comprises a transmitting unit, a local oscillator unit and a receiving unit, the transmitting unit receives signal input from the digital signal processing unit for transmitting, and the receiving unit outputs the received signal to the digital signal processing unit; a transmitting intermediate frequency module and a transmitting SIP module are arranged in the transmitting unit. Through SIP modular design, a large number of radio frequency bare chips are integrated in a tube shell, the integration level of the assembly can be greatly improved, meanwhile, the self-shielding characteristic of metal ceramic BGA packaging is utilized, a metal partition wall occupying a large space in a traditional microwave assembly can be omitted, and the space of the assembly is greatly saved.

This invention discloses a millimeter-wave metasurface radar receiving antenna, transmitting antenna, and integrated transceiver antenna. From top to bottom, it comprises an upper dielectric substrate, a first metal plate, a prepreg, a lower dielectric substrate, and a second metal plate. A receiving metasurface structure is formed on the upper surface of the upper dielectric substrate. A receiving feed slot is etched into the first metal plate. A receiving strip feed line is formed between the prepreg and the lower dielectric substrate. Metal vias are formed around the receiving metasurface structure, the receiving feed slot, and the receiving strip feed line on the upper surface of the upper dielectric substrate and between the second metal plate, forming a self-shielding cavity for the receiving antenna. This invention not only features small size, low profile, compact structure, and simple manufacturing, but also ensures high transmit / receive isolation and high-order harmonic suppression for the millimeter-wave radar transceiver antenna.

A design method of a SERF (Spin-Exchange-Relaxation-Free) inertial measurement gradient self-shielded coil, which generates a gradient magnetic field of a specified size in the target field region of the atomic cell inside the shielded barrel to compensate for the magnetic field gradient, while rapidly attenuating the magnetic field between the outside of the self-shielded coil to zero, thereby facilitating the reduction of the magnetic field coupling between the shielded barrel and the coil and improving the inertial measurement accuracy.

The embodiments of the present disclosure disclose a delay circuit and a memory, comprising a self-shielding module and a delay module. The self-shielding module is configured to receive an initial command signal and N initial clock signals, register the initial command signal according to a first initial clock signal of the N initial clock signals that triggers the initial command signal first, shield N-1 second initial clock signals of the N initial clock signals, and output N intermediate command signals, wherein N is an integer greater than or equal to 2; the N initial clock signals have the same frequency and different phases; the delay module is electrically connected with the self-shielding module and is configured to receive the N intermediate command signals and the N initial clock signals, delay output the N intermediate command signals to obtain delay command signals. The present disclosure can improve the accuracy of signal processing.

The application discloses a superconducting high-frequency coaxial cable and a preparation method thereof. The cable is coaxially arranged from inside to outside as a center superconducting inner conductor, a sandwich composite insulation structure, a self-shielded superconducting outer conductor and a flexible cold-proof sheath layer. The cable is provided with an embedded liquid nitrogen microcirculation active cooling structure, which comprises a first liquid nitrogen microchannel and a second liquid nitrogen microchannel. The center superconducting inner conductor is made of niobium-titanium alloy or niobium-tin alloy, and the first liquid nitrogen microchannel is axially arranged in the center superconducting inner conductor, so that the conductor can be actively cooled in situ, the superconducting transmission state can be continuously maintained, and the high-frequency signal transmission loss can be effectively reduced. The application adopts an inner-outer double-microtube liquid nitrogen active microcirculation cooling structure, discards the traditional external passive refrigeration mode, realizes the in-situ cooling of the inner conductor and the whole-domain heat insulation and cooling of the outer conductor, realizes the uniform and stable temperature of the whole cable, completely eliminates the superconducting quenching risk, removes the solid redundant structure of the conductor, reduces the overall weight of the cable and improves the wiring flexibility.

This invention discloses a magnetron sputtering target core with good magnetic field uniformity, comprising a target core holder and a magnet holder, wherein the target core holder and the magnet holder are connected by multiple fasteners; four magnet groups are fixedly installed on the magnet holder, wherein two edge magnet groups are on both sides, and two middle magnet groups are between the two edge magnet groups; the two edge magnet groups are installed on the plane of the magnet holder, while the two middle magnet groups are installed on a raised step in the middle of the magnet holder; each of the four magnet groups is composed of multiple rectangular magnetic blocks arranged sequentially along the length direction. The four magnet groups of the magnetron sputtering target core in this invention adopt a special arrangement of Hellbeck array, which gives the target core advantages such as a strong unilateral magnetic field, good magnetic field uniformity, high magnetic field utilization, and self-shielding characteristics, thereby optimizing the magnetic field distribution in the vacuum coating chamber and further improving the coating effect.

The utility model relates to a sliding door device, including shield room and door board. The door hole has on the side wall of shield room. The ground before door hole has two guide rails. The support plate has on the guide rail, and the support plate is rectangle, and the lower surface of one pair of opposite sides is connected with the sliding block matched with the guide rail. The door board is perpendicular with the support plate, and the lower side is connected with the side of support plate adjacent to the door hole. The support plate has two rib plates on the upper surface, and the two rib plates are right triangle, and two straight edges of them are connected with the upper surface of support plate and the vertical edge of door board respectively. The power mechanism has between two rib plates, and the power mechanism is arranged vertically, and the output shaft faces downward and is in the activity state and passes out below the support plate and is connected with the gear. The ground on the side of gear is connected with the rack, and the longitudinal direction of rack is parallel with the guide rail, and it is engaged with gear. The door board of the utility model can be closed tightly with the door hole, and the leakage of the rays in the shield room can be avoided. It is suitable for the closing or opening of the shield room door board of the self-shield electron accelerator.

The utility model relates to the technical field of power converters, in particular to a power module and a power converter. The utility model aims to solve the problem that miniaturization and integration of a power module are difficult to realize due to the fact that a shielding piece of the power module is relatively large in size. The utility model provides a power module which comprises a substrate, a chip and a plurality of first pins, the chip is arranged on the substrate, the first ends of the first pins are arranged on the substrate, and the first pins are coupled with the chip through the substrate. The power module further comprises a shielding piece, the shielding piece is arranged on the substrate, a shielding space is defined by the shielding piece and the substrate, the chip is located in the shielding space, electromagnetic interference generated by the chip can be shielded, and electromagnetic shielding is achieved. The first end of the first pin is exposed relative to the shielding member, so that the shielding effect of the shielding member can be ensured, the size of the shielding member can be reduced, miniaturization and integration of the power module can be realized, and self-shielding of the power module can be realized.

According to the technical scheme, the stable magnetism type gradient compensation Halbach magnet ring comprises a basic 3D Halbach magnet ring body, the magnet ring body is of a cylindrical three-dimensional structure and is formed by arranging a plurality of fan-shaped magnetic tiles according to a Halbach array rule, the magnetization direction of the magnetic tiles follows a Halbach array angle formula, and the magnetic tiles are used for achieving magnetism gathering and self-shielding on an xoy plane; the Z-axis two-end layered compensation magnetic tiles are arranged on the end faces of the Z-axis two ends of the basic magnetic ring body, the compensation magnetic tiles are of a multi-layer structure, the number of layers is at least two, the thickness of each layer is gradually increased outwards along the Z axis, and the compensation magnetic tiles are used for gradient compensation of magnetic field attenuation in the Z-axis direction; the magnetic ring assembly is sleeved with the layered thickened shielding iron shell, the thickness of an iron shell body is a standard value, and the thickness of the iron shell corresponding to the compensation areas at the two ends of the Z axis is thickened in a layered mode and is matched with the thickness gradient of the compensation magnetic tile. By adopting the collaborative design of the layered compensation magnetic tiles and the adaptive shielding iron shell, the problem of non-uniform magnetic field of the 3D Halbach magnetic ring in the Z-axis direction is effectively solved.

An integrated imaging and passive directional finding (DF) system for a guided munition or weapons platform includes an electro-optical infrared (EOIR) imager within a nosecone of the weapons platform and configured for imaging of a detected target. The passive DF system includes an array of long periodic array (LPA) antenna elements, each element disposed on a face of a tapered conical ground chassis having a polygonal cross section, the LPA antenna elements self-shielded from the EOIR imager and other electronic components by the ground chassis. Each LPA antenna element scans for signals of interest (SoI) within the ultra-wide band (UWB) frequency range. Geolocation or passive direction finding (DF) based on detected signals of interest may be performed to guide the weapons platform into imaging range of one or more targets of interest, where EOIR imaging may take over for target discrimination and aimpoint refinement.