51 results about "Annular field" patented technology

The present invention provides an electric power semiconductor device, including a field plate which uses thin metallic film in edge termination structure, and capable of allowing the width of the edge termination structure to reduce even though there is large profile etching quantity or changed etching quantity, and showing excellent reliability of forward direction breaking voltage ability for a long time, as well as minimizing the change of the forward direction breaking voltage ability. The edge termination structure includes a plurality of p type guard rings, first insulating films for covering the surfaces of a plurality of annular p type guard rings, and annular field plate setting on the top of the guard ring by the first insulating film. The field plate includes multicrystal silicon film and metallic film which thickness is more than that of the multicrystal silicon film. The guard ring includes a first guard ring and a second guard ring, the multicrystal silicon film is set on the first guard ring by the first insulating film, and a twolayer field plate composed of the multicrystal silicon film and the metallic film stacked by the second insulating films, is set on the second gurad ring, the first and the second guard rings are set alternately.

The invention discloses an ecological fish farming method in a rice field, which comprises the following steps of rice field preparation, rice field transformation, fish farming facility preparation, rice seedling transplantation, biosorption, rice field disinfection, irrigation, fertilization, stocking fish seed selection, stocking fish fry disinfection, stocking and feeding management, wherein annular field fish ditches dug through the rice field transformation are V-shaped ditches arranged on the inner sides of ridges around the rice field; the biosorption utilizes a biosorption agent to adsorb heavy metal in rice field soil and irrigation water; and stocking fish seeds are selected from eight-beard catfishes. The invention further discloses rice produced by rice plants planted in the rice field using the ecological fish farming method. According to the method and the rice, an effective usable area of the rice field is increased significantly; pollution of the heavy metal such as lead and cadmium is reduced; integral benefits of fish farming in the rice field are improved; the ecological rice contains rich protein, more microelements such as iron, magnesium and calcium, and vitamin C, has no chemical pesticide residual, and is green and environment-friendly; and the content of the heavy metal such as lead and cadmium is very low.

An applicator device for applying a substance to an area of the body that is difficult to reach includes a collapsible handle and a head portion rotatably mounted on one end. The head portion includes an attachment means, which can comprise either a field of hooks or a field of loops. The attachment means receives a two-sided pad engagement member that preferably has fields of loops or hooks on one side to engage the respective hooks or loops of the attachment member, and a field of hooks on its opposite side. The hooks of the pad engagement member can securely retain a pad that carries the substance to be applied to the body.

The invention relates to an optical system of an ultraviolet multi-band panoramic imaging instrument, relating to the technical field of space optics and solving the problem that an optical system of a conventional ultraviolet limb annular imaging instrument cannot realize imaging of a 360-degree annular field of view. The optical system is composed of a reflecting and refracting lens, a relay lens group, an optical filter and an area array detector, wherein the optical system is made of an ultraviolet material with the waveband scope of 250 nm to 380 nm; and the multi-waveband imaging is realized by selecting optical filter with different central wavelengths. The aperture diaphragm of the system is located in the relay lens group; the entrance beam of the 360-degree annular field of view becomes a virtual image through the reflecting and refracting lens; the image surface of the virtual image is located in the reflecting lens; the relay lens group images the virtual image of the reflecting and refracting lens for the second time, and finally forms an image on the area matrix detector. As a reflecting surface and a refracting surface are combined together, the optical system is relatively small and compact in structure, is suitable to be used as an optical system for ultraviolet limb panoramic imaging on a satellite, and is applied to the fields, such as atmospheric remote sensing for aerospace and aviation, earth observation and the like.

A direct current generating including an annular armature connectable to rotate with a rotating component of a wind turbine and a stationary annular field winding coaxial to the armature and separated by a gap from the armature. The field winding is configured to include superconducting coil magnets and a support structure connectable to an upper region of a tower of the wind turbine. The direct current generator further including a commutator assembly configured to transfer DC current generated by the rotating armature to a power conversion system.

The utility model relates to a calibration system and method for annular camera array, which belongs to the technical field computer multimedia; wherein, the system comprises a calibration plate, a camera array, a plurality of collection servers, a calibration server and a plurality of net wires; the technical proposal is that all cameras are used to shoot each position pose of the calibration plate in the annular field and images of each position pose are collected; a plurality of collection servers are used to conduct respective corner detection on all collected images and homography matrix Hij of each camera is calculated; the calibration server optimizes and classifies the camera array according to the number of public position pose that can be detected between two cameras as the relationship weight; joint calibration inside groups is carried out on each group of camera arrays and the external parameters of each group are unified with the external parameters with the same camera as world coordinate origin; the calibration parameters are optimized and the maximum likelihood estimate of internal and external parameters of camera array is gained. The utility model can precisely restructure three-dimensional scenes and can be viewed from any perspective.

The invention is a central column for a spherical tokamak magnet toroidal field coil, composed of inner and outer profile conductor layers, where all profile conductors are circumferentially and uniformly distributed; sections of 12 profile conductors are trapeziform in shape, and short bases of them are circularly arranged opposite to the center of the central column; centers of them are formed with natural air flow cooling holes; sections of 12 outer profile conductors are of a quasi-trapezoid with an long arc side in shape, the arc bases of them are opposite to outer surface of the central column and circularly arranged outside the inner profile conductors to form the outer layer of the central column. The top-end and bottom-end terminals of each profile conductor are connected with a turning arm to form a turn of the toroidal field coil, thus forming 24 turns in common; there is a current flowing through each profile conductor and these currents are codirectional and equal, corresponding to ampere-turn of the toroidal field coil. The invention can permit the maximum 12000A pulse current to flow through the toroidal field coil but the inner temperature does not obviously rise.

The invention discloses a no-blind-point catadioptric panoramic imager. The optical system comprises a forward field of view and an annular field of view and comprises a front lens set, an annular reflective mirror, a subsequent lens set and an image surface detector. The front lens set is used for receiving the light beams of the forward field of view. The annular reflective mirror is arranged after the front lens set and used for receiving the light beams of the annular field of view and transmitting the light beams of the forward field of view received by the front lens set. The subsequentlens set is arranged after the annular reflective mirror and used for performing aberration correction and relay image transformation on the light beams of the forward field of view and the annular field of view. The image surface detector is arranged after the subsequent lens set and used for imaging the light beams focused by the subsequent lens set. The forward field of view of the panoramic imager can greatly compensate the blind observation area of the common catadioptric large field-of-view imaging system so that the area utilization rate of the CCD detector can be enhanced and no-blind-area panoramic detection can be realized.

The invention discloses a method and an apparatus for a superconducting direct current generator driven by a wind turbine, including an annular armature connectable to rotate with a rotating component of a wind turbine and a stationary annular field winding coaxial to the armature and separated by a gap from the armature. The field winding is configured to include superconducting coil magnets and a support structure connectable to an upper region of a tower of the wind turbine. The direct current generator further includes a commutator assembly configured to transfer DC current generated by the rotating armature to a power conversion system.

Optical structure and design concepts are provided, using a Y-Zernike polynomial, and by which optical components, optical components and optical structures, can be designed and produced, to image at extreme ultraviolet (EUV) wavelengths, at a relatively high NA (e.g. 0.35), with a relatively large field of view (e.g. 26×2 mm). Moreover, an optical structure produced according to the principles of the present invention has a small amount of asymmetry, which enables the components of the optical structure to be manufactured with current manufacturing techniques.

The invention discloses a power diode device. The power diode device comprises a substrate, a buffering layer, an epitaxial layer, an ALN (Aluminum nitride) layer, a field limiting ring, an annular field plate and a metal layer which are arranged in a cascading manner, wherein the metal layer forms a schottky junction; the epitaxial layer is electrically connected with a cathode; the metal layer is connected with an anode; a plurality of annular concave and convex parts are formed on the annular field plate; the highest point of a convex part of the annular field plate is gradually raised from the inner side of a power component to the outer side; the lowest point of the annular field plate is gradually raised from the inner side of the power component to the outer side; the projection of the annular field plate closest to the center of the power diode device on the epitaxial layer is positioned in the filed limiting ring closest to the center; and the metal layer covers each concave part of the annular field plate.

The invention discloses an odor control and deodorization system of a refuse landfill. The odor control and deodorization system comprises a reservoir region membrane laminating sealed odor control unit, a landfilling working surface leakage-proof membrane sealed odor control unit and an annular field and partitioning membrane anchoring sealed odor control unit, wherein the reservoir region membrane laminating sealed odor control unit is used for carrying out refuse dump odor control in a refuse reservoir region; the reservoir region membrane laminating sealed odor control unit is arranged nearby the landfilling working surface leakage-proof membrane sealed odor control unit or surrounds the landfilling working surface leakage-proof membrane sealed odor control unit; the landfilling working surface leakage-proof membrane sealed odor control unit is used for controlling the odor of a refuse landfilling working surface; the annular field and partitioning membrane anchoring sealed odor control unit is arranged at the periphery of the reservoir region membrane laminating sealed odor control unit. According to the odor control and deodorization system disclosed by the invention, refuselandfilling work is combined with odor control, and the odor control and deodorization are combined; the all-directional and multi-layered odor control and deodorization system is set; operation working time can be arranged and set according to changes of seasonal climates and weather and wind directions; the odor control and deodorization effects are good.

A rotating electrical machine with a transmission, comprises a stator including a field coil arranged annularly, a cylindrical-shaped rotor, which rotates within the stator, transmissions provided within the cylindrical-shaped rotor, and housings to contain at least the rotor, the transmissions, and lubricating oil, and wherein the stator comprises the annular field coil and an annular core, in which the annular field coil and an organic material are contained and on an inner peripheral surface of which are provided a plurality of projecting claws.

The invention belongs to the technical field of emission of cathode fields, and specifically provides a polycrystal hexaboride annular field emission cathode and a preparation method thereof. The field emission cathode is distributed as a concentric circle annular array; the cross section of the field emission cathode is structured as that pointed tapered bulges are distributed at intervals; the field emission cathode is made from rare-earth metal or polycrystal hexaboride that is prepared through alkaline-earth metal and boron and of a CaB6 type crystal structure. Compared with the traditional pointed tapered field emission cathode, the polycrystal hexaboride annular field emission cathode is of a firm structure that effectively avoids the shortcoming that a pointed tapered field emission body is not firmly contacted with a substrate; in addition, proper mask material and corresponding electrochemical etching electrolyte composition are selected, and various process parameters are adjusted, in order to prepare a large-area polycrystal hexaboride annular field emission cathode that is outstanding in electronic emission performance; the preparation method is simple and easy to be carried out; the effective field emission area is expanded; emission current of thousands and even tens of thousands amperes can be supplied, and thus the preparation efficiency is effectively raised.

A direct current generating including an annular armature connectable to rotate with a rotating component of a wind turbine and a stationary annular field winding coaxial to the armature and separated by a gap from the armature. The field winding is configured to include superconducting coil magnets and a support structure connectable to an upper region of a tower of the wind turbine. The direct current generator further including a commutator assembly configured to transfer DC current generated by the rotating armature to a power conversion system.

The invention discloses an annular magnet based on a ReBCO superconducting ring piece belonging to the technical field of superconducting magnet application. The annular magnet is composed of a plurality of identical unit annular field magnets uniformly distributed along the annular direction, wherein, the unit annular field magnets are obtained by alternately stacking N ReBCO superconducting ringsheets and N+1 insulating sheets, wherein N is a positive integer; ReBCO superconducting rings are D-shaped, and N + 1 insulating rings are the same size as N ReBCO superconducting rings. A low-temperature Dewar immersion type cool magnet has that advantages of high magnet current carry capacity, low heat leakage, compact structure and disassembly, and can generate a stable large-space magnetic field, and is widely used in the fields of medium and large Tokamak magnet, thermonuclear fusion reaction and the like.

A toroidal field coil comprises a central column, a plurality of return limbs, a quench protection system, and a cooling system. The central column comprises HTS material. Each return limb comprises aquenchable section, two HTS sections, and a quenching 5 system. The quenchable section comprises superconducting material, and is configured to contribute towards a magnetic field of the toroidal field coil. The HTS sections comprise HTS material. The HTS sections electrically connect the quenchable section to the central column and are in series with the central column and the quenchable section. The quenching system is associated with the quenchable section 10 and configured to quench the quenchable section. The quench protection system is configured to detect quenches in the toroidal fieldcoil and, in response to detection of a quench, cause the quenching system to quench the superconducting material in one or more of the quenchable sections in order to dump energy from the toroidal field coil into the one or more quenchable sections. The cooling system is configured to cool each 15 quenchable section to a temperature at which the superconducting material is superconducting. Eachquenchable section has a heat capacity sufficient to cause a temperature of the quenchable section to remain below a first predetermined temperature when energy is dumped from the toroidal field coilinto the quenchable section, and a resistivity sufficient to cause decay of the magnet's current quickly 20 enough that the temperature of the quenched part of the HTS section remains below a second predetermined temperature.

Disclosed is a high voltage terminal. A heavy doping P+ type groove-shaped field limiting ring is arranged on the periphery of an active area of a gate associated transistor of a groove-shaped gate polycrystalline silicon structure, the depth of a groove is in a range from 1micrometers to 6 micrometers, a heavy doping N+ type polycrystalline silicon annular field plate is arranged above the field limiting ring, the upper surface of the polycrystalline silicon field plate is connected with a metal layer AL, and the metal layer AL is connected with the bottom surface of the groove of the P+ type groove-shaped field limiting ring. The high voltage terminal has the advantages that the high voltage terminal is matched with a transistor core process of the gate associated transistor of the groove-shaped gate polycrystalline silicon structure, materials are saved, photoetching times are reduced, the cost is lowered, and the processing cycle is shortened.

An electromagnetic clutch includes a first rotation transmission portion, annular field core, rotation stop member, second rotation transmission portion, armature, and spring member. The annular field core is supported by the first rotation transmission portion via a first bearing. The first bearing is housed in a hollow portion of the field core and fitted on an inner circumferential surface of the field core. The rotation stop member includes a flat portion which is fixed to an end of the field core on a side opposite to the armature. The flat portion is formed integrally with a retaining piece which projects toward the hollow portion of the field core and faces the first bearing when viewed from the axial direction of the field core.

A ring-type FET may include a silicon base, a source formed on a portion of the silicon base through doping, a channel formed to encompass the source on a plane, a drain formed outside the channel, a dielectric layer formed on the source, the channel and the drain, and a gate provided on the dielectric layer, wherein a center of the source is spaced apart from a center of the channel, and the gate is formed of a metal material, disposed above the channel and configured to cover an upper face of the channel and overlap a portion of the source and a portion of the drain.

A system includes a generator unit coupleable to a hydro turbine. The generator unit includes a casing having a first stationary support coupleable to a base disposed within water and a superconducting generator disposed within the casing. The superconducting generator includes an annular armature and an annular field winding including a plurality of superconducting magnets disposed coaxial with the annular armature and separated by a gap. One of the annular armature and the annular field winding is rotatable by the hydro turbine and other of the annular armature and the annular field winding is stationary.

The invention discloses a poloidal field coil assembly for use in a tokamak. The poloidal field coil assembly comprises inner and outer poloidal field coils and a controller. The inner poloidal fieldcoil is configured for installation inside a toroidal field coil of the tokamak. The outer poloidal field coil is configured for installation outside the toroidal field coil. The controller is configured to cause current to be supplied to the inner and outer poloidal field coils such that the combined magnetic field produced by the inner and outer poloidal field coils has a null at the toroidal field coil.

The invention belongs to the field of an electrical equipment insulation process, and particularly discloses an integral pre-tightening insulation method for a central cylinder of a plate-type annularfield coil. The integral pre-tightening insulation method comprises the steps of winding an impregnation glass tape around a workpiece, installing a heat preservation tent at the periphery of the workpiece, blowing air to the tent by a fan, performing heating and cooling, and finally, turning a cured fiber glass insulation cylinder. Compared with the prior art, the method has the advantages thatthe defect that the pre-stress function cannot be achieved by an existing insulation cylinder is overcome, and the pre-stress glass steel insulation cylinder obtained by production has relatively highpre-stress and also has good insulation effect; with the adoption of HW200-type impregnation glass tape, the pre-stress of the fiber glass insulation cylinder formed after curing can conform to requirement; and meanwhile, by the pre-stress fiber glass insulation cylinder, a favorable insulation effect between the coil and other parts of the device can be achieved.

The invention provides a terminal for a semiconductor power device. The terminal for the semiconductor power device comprises a collector electrode, a base region, a plurality of annular field limiting rings and a plurality of metal field plates corresponding to the field limiting rings, wherein the field limiting rings are arranged at intervals; the intervals between two adjacent field limiting rings are equal; the field limiting rings comprise a plurality of main bending parts and a plurality of main straight parts; the main bending parts are positioned between two adjacent main straight parts; the widths of the main bending parts decrease gradually along the middles of the main bending parts to two sides; the widths of the main bending parts of the field limiting rings are larger than the widths of the main straight parts of the corresponding field limiting rings; and the widths of the main bending parts increase gradually from sides close to geometric centers of the field limitingrings to sides far away from the geometric centers of the field limiting rings. Through adoption of the terminal for the semiconductor power device provided by the invention, the electric field spikesat corners can be reduced, and the stability and reliability of the semiconductor power device are enhanced.

The invention provides a high-speed industrial communication system based on OFDM and a control method. The high-speed industrial communication system based on the OFDM communication system comprisesa plurality of node devices and at least one two-wire system field bus. Transmission ports of the node devices are connected to the two-wire system annular field bus. The plurality of node devices areconfigured to communicate with each other in an OFDM modulation mode. Each node device sends modulated data signals to the two-wire system annular field bus in a broadcast mode, and the other node devices directly receive the data signals from the two-wire system annular field bus. The two-wire system annular field bus based on OFDM is used so that the problem of network disconnection caused by accidental disconnection of bus nodes or transmission lines can be effectively solved, meanwhile, high multi-path interference resistance is achieved, and multi-user, high-real-time and high-reliability data transmission can be achieved.

The invention provides a high-speed industrial communication system and a node circuit thereof. The node circuit comprises a signal processing circuit and a controller, wherein the signal processing circuit performs signal processing on an input signal and an output signal of the node, and comprises an automatic gain control circuit; and the controller is connected with the signal processing circuit, controls the output signals to the node or receives the input signal from the node, and performs OFDM modulation on the signal. According to the node circuit of the high-speed industrial communication system, due to the fact that each node circuit has an AGC function, attenuation of the signal in the transmission process on the two-wire system annular bus is compensated for due to the AGC function, or amplitude overrun is compressed due to the AGC function. Thus, stable receiving of the signals is guaranteed, an OFDM modulation mode is used in the two-wire system annular field bus, and theanti-multipath interference capability is high.

The invention discloses an optical system. A first lens is a dual-convex positive lens, a second lens and a fifth lens are convex-concave negative lenses, and an opening of each of the second lens andthe fifth lens is towards an image plane; the third lens and the fourth lens are dual-convex positive lenses; the sixth lens is the concave-convex negative lens and the opening is towards an object plane; the seventh lens and the eighth lens are dual-convex positive lens, the adjacent center distance of the first lens and the second lens is 0.3mm; the adjacent center distance of the second lens and the third lens is 1.5mm; the adjacent center distance of the fourth lens and the fifth lens is 21.2mm; the adjacent center distance of the fifth lens and the sixth lens is 66.3mm; the adjacent center distance of the sixth lens and the seventh lens is 0.3mm; the adjacent center distance of the seventh lens and the eighth lens is 0.3mm; and the adjacent center distance of the eighth lens and a target surface is 23.28mm. The system can provide a 360-DEG inner hole annular field-of-view optical system which is reasonable in structure, precise and convenient for hole internal detection, and suitable for the small-size object observation.