28results about How to "Increase the effective area" patented technology

The present disclosure relates to a laser surface processing method, device, storage medium and program product, and relates to the field of laser processing. The method comprises: iteratively performing one or more rounds of laser processing steps until a first preset condition is met, each round of laser processing steps comprising: determining the position and target topography parameters of a current set of single-point laser irradiation on a current processing surface of a processing object based on the topography difference between the current processing surface and a target concave surface; determining the processing parameters of the current set of single-point laser irradiation corresponding to the target topography parameters of the current set of single-point laser irradiation based on the correspondence between the target topography parameters and the processing parameters of single-point laser irradiation; and controlling a laser to perform laser irradiation at the position of the current set of single-point laser irradiation with the processing parameters of the current set of single-point laser irradiation to form a corresponding set of first concave surfaces on the current processing surface. The scheme of the present disclosure can form a concave surface with a relatively large effective area.

A hybrid trench Schottky trench-type superbarrier diode and its fabrication method are disclosed. This relates to the field of semiconductor technology. From bottom to top, the diode comprises: a cathode electrode layer, an N+ substrate layer, an N- epitaxial layer, wherein the N- epitaxial layer has a plurality of spaced-apart P-type implantation regions; each P-type implantation region includes conductive channels and P-body regions spaced-apart from top to bottom; a dielectric layer, a silicon dioxide layer, wherein the silicon dioxide layer has a plurality of trenches extending downward from its top to the P-body regions; and an anode electrode layer, the bottom of which extends to the P-body regions through trenches. This invention improves the on-resistance characteristics of the device during forward operation, thereby enhancing the device's performance and reliability.

The invention discloses an etching machine for a display screen PCB, and relates to the technical field of wet etching, the etching machine comprises a workbench, a rotating roller device, a first hydraulic cylinder, a second hydraulic cylinder, a motor, an air blowing fan and a rotating sprayer, the bottom of the inner wall of the workbench is provided with a water storage tank, the bottom of the water storage tank is provided with a water outlet, the rotating roller device is arranged on the inner wall of the workbench, and the rotating roller device is arranged on the inner wall of the workbench. The first hydraulic cylinder is fixedly installed on the outer wall of the workbench, the second hydraulic cylinder is fixedly installed on the outer wall of the workbench, and the control device is used for controlling whether the rotating spray head is communicated with the first hydraulic cylinder or not and arranged on the inner wall of the workbench and controls fluid to be connected or disconnected through mechanical coincidence and dislocation of through holes of the second water conveying opening and the first water conveying opening. Rapid and accurate response without an intermediate link is realized, and uneven etching caused by spraying angle deviation or valve delay is effectively eliminated.

The utility model relates to the technical field of transfer equipment, and discloses a KD spare part front and back suspension transfer tool which comprises a hydraulic forklift, four supporting plates are fixedly connected to the front portion of the hydraulic forklift, a plurality of positioning holes are formed in the surfaces of the supporting plates, a placing plate is arranged among the four supporting plates, and the positioning holes are formed in the placing plate. Extension assemblies are arranged on the left side and the right side of the containing plate correspondingly, a driving assembly is arranged on the front side of the containing plate, extrusion assemblies are arranged at the four corners in the containing plate correspondingly, fixing assemblies are arranged on the front side and the rear side in the containing plate correspondingly, each extension assembly comprises two telescopic plates, and the outer walls of the telescopic plates are slidably connected into the containing plate. According to the utility model, the extension assembly and the driving assembly are arranged, so that flexible adjustment can be carried out according to different specifications of front and rear suspensions of KD spare parts. When large-size spare parts are encountered, the motor drives the gear to be meshed with the rack plate, the telescopic plate is driven to slide, and the effective area of the containing plate is increased.

This invention provides a method for fabricating a CNTs / PDMS microstructure triboelectric nanogenerator, comprising the following steps: PCL particles are poured into the barrel of a 3D printing device and formed onto a printing receiver plate side by near-field direct writing and fused deposition modeling to obtain a PCL film with two patterns; a mixture of PDMS and a curing agent is stirred, carbon nanotubes are added and stirred further, followed by ultrasonication to obtain a mixed solution; the mixed solution is coated onto the PCL film, followed by vacuum treatment; the film is heated and dried to obtain a dielectric layer; the PCL on the film surface is removed to obtain a CNTs / PDMS dielectric layer; a copper foil is covered on the smooth surface of the dielectric layer as one end electrode, a PET layer is attached as a protective layer, and the other side is covered with copper foil to obtain another electrode; PET is then placed on top, and wires are led out from the two electrodes to connect to a load, thus obtaining the nanogenerator. This invention provides a method for fabricating a nanogenerator with low fabrication requirements and capable of producing nanogenerators with good overall performance.

The utility model relates to blow molding plastic car oil tank production discloses a kind of blank adsorption tooling including fixed seat, adsorption component, two rotating shafts and two drive components, and the end of fixed seat is set to the end of robot mechanical arm, and adsorption component is set to the other end of fixed seat, and adsorption component includes first adsorption block, second adsorption block and third adsorption block sequentially arranged along blank length direction, two rotating shafts are respectively set to the both ends of second adsorption block, and the end of first adsorption block and third adsorption block close to second adsorption block is respectively hinged on corresponding rotating shaft, and two drive components are respectively set to the side of first adsorption block and third adsorption block away from blank, for cooperation rotating shaft to drive first adsorption block and third adsorption block rotate towards blank direction;The blank adsorption tooling can effectively prevent blank from being stripped due to external vibration, inertial force and other factors during conveying, improve the stability of blank clamping and conveying.

The invention provides a vibrating diaphragm, a sound production unit and audio equipment. The vibrating diaphragm comprises a first mounting wing, a second mounting wing and a folding unit formed by continuous bending, the folding units form a plurality of folding spaces, and folding plates are formed on the two sides of the folding spaces. The tops of the two ends of the folding unit are arranged on a first plane, the top of the center of the folding unit is arranged on a second plane, and a first distance is formed between the first plane and the second plane; the distance between the folding plates on the two sides of the folding space changes along with the length of the folding units. The sound production unit comprises a first support, a magnet, a second support, a damping net and a damping plate. The loudspeaker also comprises the vibrating diaphragm of the above implementation mode. The first mounting wing and the second mounting wing are arranged on the first bracket and between the first bracket and the magnet; the audio equipment comprises a sound production unit. The vibrating diaphragm, the sound production unit and the audio equipment provided by the invention make up the defect of weak low-frequency performance in the prior art, and realize full-band balanced sound production.

The utility model relates to the technical field of environment-friendly weaving, in particular to a waste gas treatment device during heating of environment-friendly weaving, and aims to solve the technical problems that liquid drops converge into a small stream of liquid flow to flow down on the inner wall of a spray tower of a waste gas treatment device in the prior art, a liquid film cannot be formed on the inner wall of the spray tower, and the effective contact area with flue gas is too small. Comprising a treatment tower, a waste gas inlet pipe, an exhaust pipe, a rotating joint, a gear, a liquid inlet pipe, a liquid distribution pipe, a plurality of spraying pipes, nozzles and a film laying pipe, during spraying, power drives the spraying pipes and the nozzles to synchronously rotate, the nozzles rotate for spraying to make up spraying dead angles, and meanwhile, the spraying quality cannot be greatly influenced even if part of the nozzles are blocked; the spraying pipe drives the film laying pipe to rotate, the film laying pipe rotates to evenly flatten small liquid flow on the inner wall of the treatment tower on the inner wall of the treatment tower through the gaps to form a liquid film, the effective contact area with flue gas is effectively increased through the formation of the liquid film, and then the spraying effect is improved.

The application provides a semiconductor chip structure, and belongs to the field of semiconductors.The semiconductor chip structure comprises a substrate, a first surface and a second surface opposite to each other; a plurality of separated active regions, the active regions extending from the surface of the substrate into the substrate; a gate structure covering part of the active regions and an epitaxial layer between two adjacent active regions; a double-layer metal interconnection layer comprising a first metal layer and a second metal layer, the active regions being electrically connected to the first metal layer; an interlayer dielectric layer filled between the first metal layer and the second metal layer; and a pad structure located on the second metal layer.The first metal layer and the second metal layer are arranged, and the interlayer dielectric layer is filled between the first metal layer and the second metal layer, so that the active regions are arranged below the pad structure, the area of the active regions is increased, the effective area of the chip is improved, and the production cost of the chip is reduced.

The invention belongs to the technical field of optical communication, and particularly discloses a preparation method of an ultra-low attenuation optical fiber and the ultra-low attenuation optical fiber, and the preparation method comprises the steps: S1, preparing a fluorine-doped sleeve with non-uniform fluorine distribution through employing an external vapor deposition technology; s2, stretching and corroding the fluorine-doped sleeve to obtain an inner cladding with a predetermined aperture; s3, SiO2 is deposited in the inner cladding layer by using an in-tube vapor deposition process, alkali metal doping is performed to form a core layer, the inner cladding layer with the core layer is melted and shrunk into a rod shape, and a rod-shaped structure is obtained; s4, preparing an outer cladding layer outside the rod-shaped structure through an external vapor deposition process, drying the rod-shaped structure with the outer cladding layer, and solidifying in a fluorine-containing atmosphere to obtain an optical fiber preform; and S5, drawing the optical fiber preform to form the optical fiber. According to the preparation method, external chemical vapor deposition and in-tube vapor deposition are utilized to achieve better optical fiber profile matching and viscosity matching.

The utility model relates to closed cooling tower technical field, concretely relates to a closed cooling tower, including cooling tower body, heat exchange plate and filler, the heat exchange coil pipe is equipped with in the cooling tower body inner chamber, the top surface and the bottom surface of heat exchange coil pipe are spaced apart and are welded with a plurality of heat exchange plates, the filler sets up between each layer water pipe of heat exchange coil pipe, the utility model discloses spaced apart and are welded with a plurality of heat exchange plates on the top surface and the bottom surface of heat exchange coil pipe, utilize heat exchange plate to increase the formation area of water film, namely increased the effective area of evaporative heat dissipation, to the circulating water cooling effect of flowing in heat exchange coil pipe is thus promoted, simultaneously adds the filler between each layer water pipe of heat exchange coil pipe, utilizes the filler to scatter, spreads out, forms extremely thin water film or breaks into a large number of small water drop with big granule water drop or water flow, maximizes the contact area and contact time between water and air, thereby efficiently carries out heat exchange.

The utility model provides a hydraulic oil cylinder device and a hydraulic driving system. The hydraulic oil cylinder device comprises a device body, a first piston assembly and a second piston assembly. The device main body comprises a first end cover piece, a first cylinder barrel, a middle end cover piece, a second cylinder barrel and a second end cover piece, the first end cover piece is provided with a first oil port and a first oil cavity which are communicated with each other, and the first end cover piece is provided with a convex ring part; the first cylinder barrel is provided with a first piston cavity communicated with the first oil cavity, and the convex ring part is located in the first piston cavity and connected with the first cylinder barrel; the first piston assembly is arranged in the first piston cavity and the first sliding through groove in a penetrating mode and connected with the first cylinder barrel and the middle end cover piece in a sliding mode. The first piston assembly is used for abutting against the convex ring part when sliding to one end of the first piston cavity; the second piston assembly is in sliding connection with the second cylinder barrel and the second end cover piece, and the second piston assembly further abuts against the first piston assembly. The hydraulic oil cylinder device is high in working efficiency.

The utility model relates to a product matched with a police gas mask for special tasks such as special duty and law enforcement, group disturbance and violence and terrorism events and high-risk occasions, in particular to a police anti-riot radial efficient low-resistance canister. The utility model relates to a dust filter which comprises a tank body, a filter body, dust filter cloth a, a middle air passage, a base, an upper fixing plate, an annular radial smoke filter layer, a filter layer partition plate, dust filter cloth b and a lower fixing plate, during air suction, air enters from an air inlet hole of the base, is upwards and annularly distributed on the inner wall of the tank body through an interlayer formed by the lower fixing plate and the base, and then radially enters through the annular radial smoke filter layer; after smoke and dust particles in the gas are filtered out, the gas enters the filtering body to filter out toxic and harmful gas, and then the gas enters the mask through the middle gas channel. The structure is compact, wearing is comfortable, and the canister is convenient to store and use. The problems that in the prior art, no special comprehensive gas defense filter tank for police exists, and only an industrial comprehensive gas filter tank is used, so that the service time is short, and the protection effect is poor are solved.

The application discloses a circuit board for an automatic medical injector and a production process thereof, and particularly relates to the technical field of circuit board manufacturing. The circuit board for the automatic medical injector adopts an elastic bending-resistant substrate as a substrate, selects elastic metal as a raw material, adds polyether in synthetic fibers, has good mechanical physical properties and good temperature resistance, and adds plasticizers and organic silicon as an auxiliary. The circuit board has high and low temperature resistance, electrical insulation, oxidation resistance stability, and a reinforcing layer as metal rubber. The structure is stable, and the elastic bending-resistant substrate has good elasticity, toughness and bending resistance. The use of transparent film coating and protective film double-protects the upper surface of the circuit board body, has good protection effect, avoids the phenomenon that the surface of the elastic bending-resistant substrate is damaged due to damage of the transparent film coating, improves the structure of the circuit board body, and improves the safety function of the circuit board body.

This invention provides a lightning protection device for medium-wave transmitters, belonging to the technical field of medium-wave transmitters. It includes a cabinet structure with a vertically mounted grounding mechanism on the bottom surface. A lightning rod is installed at the top of the support, serving as the first line of lightning protection. A complete intelligent grounding system is constructed, with humidity detectors evenly distributed at multiple depths in the soil layer to monitor humidity changes at different depths in real time. When a decrease in soil moisture and an increase in grounding resistance are detected, maintenance personnel can inject water into the water storage box through the water injection pipe. The water seeps evenly into the soil layer through the injection holes, effectively reducing the grounding resistance and ensuring excellent lightning protection grounding performance even in dry seasons or arid regions. Multiple grounding rods are arranged in parallel, increasing the contact area with the soil and further improving the discharge capacity. This design fundamentally solves the technical problems of traditional grounding devices being greatly affected by soil moisture and having unstable grounding effects.

The invention discloses a stress isolation resonant accelerometer sensitive structure of a T-shaped lever. The stress isolation resonant accelerometer sensitive structure comprises a movable mass block, an anchor point, a bottom plate, the T-shaped lever, a suspension spring, a tuning fork resonator and a comb tooth electrode. Wherein the movable mass block is connected to the anchor point through the suspension spring and the T-shaped lever; the comb electrodes are connected to the anchor points; the anchor point is fixed on the bottom plate; the two ends of the tuning fork resonator are connected to the two T-shaped levers. The comb teeth of the tuning fork resonator and the comb teeth of the comb tooth electrode intersect with each other. According to the design of the T-shaped lever, the sensitive structure can be connected to the bottom plate only through one anchor point while the area of the mass block is not occupied too much, the stress transmitted to the resonator from the bottom plate can be isolated, and the accuracy of acceleration detection can be improved. And meanwhile, the T-shaped lever can convert the translation of the mass block into double-end stretching or compression movement in the orthogonal direction in the resonant beam surface, so that the sensitivity of the accelerometer can be improved.

A bypass diode for improving welding application of electric resistance welding is characterized in that the bypass diode is structurally connected with a chip through first solder paste, connected with the chip and a copper connecting piece in parallel through second solder paste and connected with the copper connecting piece through third solder paste from right to left, and the above structures are wrapped by a plastic package body; the third solder paste and the copper connecting piece are connected with the first copper frame, the second copper frame is arranged on the right side of the first solder paste, and the two copper frames are provided with a tin block boss, an electric resistance welding boss, an electric resistance welding groove, a tin block boss groove and a via hole. The bottom of the chip is connected with the second copper frame.

The present application relates to the technical field of seawater desalination material preparation, and particularly relates to a double-network hydrogel evaporator for interfacial water evaporation, a preparation method and application, comprising a polyvinyl alcohol first network and a 2-acrylamide-2-methylpropanesulfonic acid second network which penetrate each other, and Ti4O7 photo-thermal absorption material is dispersed in the first network; the evaporator has a macroporous skeleton formed by the first network and a multistage pore composed of nanoscale fibrous and membranous secondary structures derived from the second network on the macroporous skeleton, the mechanical stability is improved through a double-network synergistic enhancement mechanism, the multistage pore structure is used to accelerate water transmission and increase the evaporation interface, so that the evaporator has a high evaporation rate, excellent salt resistance and long-term operation stability, and is more suitable for solar-driven seawater desalination, and solves the problems of weak mechanical strength, poor structural stability and poor environmental adaptability of the hydrogel-based evaporator in the prior art.

The utility model provides a low-voltage constant-current electrolyzed water ozone generator, which belongs to the technical field of ozone water preparation by an electrolytic method and comprises a base, a reactor shell fixed on the upper surface of the base and an electrolysis component fixed in the reactor shell and used for preparing ozone water by electrolysis, wherein a low-voltage constant-current control module for controlling stable output of electrolytic current is fixedly mounted on the base; the ozone generator has the following excellent technical effects that the structure and the process are improved, the electrolysis effective area is increased in a smaller space, the ozone generation rate is remarkably improved, the low-voltage current control module detects the current in a circuit, the constant current is kept, and the ozone generation efficiency is improved. The concentration of ozone water obtained by electrolysis can be ensured to be constant for different water qualities, so that the quality of the generated ozone water can be ensured to be stable. By utilizing the equipment, the use cost is reduced, the service life of the equipment is prolonged, the energy consumption is lower, the application range is wide, and the economic benefit is remarkable.

This utility model discloses a low-temperature catalytic reaction device for exhaust gas treatment, including a base plate. Multiple first pipes are arranged above the base plate, and a second pipe is rotatably connected between adjacent first pipes. An activated carbon mesh is detachably installed inside the second pipe. A support plate is provided on the side of the first pipe, and the support plate is fixedly connected to the base plate. An annular guide rail is provided on the outer side of the second pipe. In this application, the first and second pipes form a channel. When exhaust gas passes through, a drive motor operates. With the cooperation of a second rotating shaft, a drive roller, a transmission belt, and a driven roller, the transmission roller drives the annular guide rail to rotate, which in turn drives the second pipe to rotate. The activated carbon mesh on the inner wall of the second pipe rotates, resulting in more uniform contact between the activated carbon mesh and the exhaust gas, increasing the contact area between the activated carbon mesh and the exhaust gas, and increasing the effective area of ​​the activated carbon mesh, thus improving the utilization rate of the activated carbon mesh.

The present application relates to the field of vehicle control, and discloses a pumping device control method and device, computer equipment and a storage medium. The pumping device comprises a hydraulic pump and a pumping cylinder, and the pumping device control method comprises: obtaining a target pumping speed of the pumping device, and obtaining a real-time rotating speed and a real-time displacement of the hydraulic pump; determining a real-time pumping speed of the pumping device according to the real-time rotating speed and the real-time displacement; in the case that the real-time pumping speed is not the target pumping speed, determining an n-th pressure level of the pumping cylinder according to the highest pumping speed of the pumping device corresponding to each pressure level of the pumping cylinder; switching the pressure level of the pumping cylinder to the n-th pressure level; and controlling the real-time rotating speed and the real-time displacement of the hydraulic pump based on the target pumping speed. The application actively switches the pressure level of the pumping cylinder, controls the pumping cylinder to be in a high-pressure state, so that the hydraulic pump can work at a high displacement, thereby improving the pumping efficiency of the pumping device.

This invention relates to a large effective area ultra-low attenuation multi-core optical fiber and its applications. The large effective area ultra-low attenuation multi-core optical fiber includes at least four core layers and a common cladding surrounding and covering the core layers. The core layers are symmetrically and uniformly distributed across the fiber cross-section. Each core layer is surrounded by an inner cladding and a recessed inner cladding layer, arranged sequentially from the inside to the outside. The common cladding layer includes a first outer cladding layer and a second outer cladding layer. The relative refractive index difference between the first and second outer cladding layers increases from the inside to the outside. This invention, through a multi-layer cladding structure of "inner cladding-recessed inner cladding-first outer cladding-second outer cladding layer," combined with the increasing relative refractive index difference between the first and second outer cladding layers from the inside to the outside, achieves a synergistic improvement in ultra-low attenuation, large effective area, ultra-low inter-core crosstalk, excellent bending resistance, and good system compatibility, providing an ideal transmission medium for long-distance, high-capacity space-division multiplexing optical communication systems.

The utility model belongs to underwater cable technical field discloses a kind of bending-resistant underwater cables, including conductor, insulating layer, sheath layer and protective layer, conductor is formed by multiple copper wire strands multilayer complex twisting, and the complex twisting direction of each layer copper wire strand is same, copper wire strand is formed by multiple tinned copper wire bundle twisting, insulating layer is coated in the outer periphery of conductor, sheath layer is coated in the outer periphery of insulating layer, protective layer is coated in the outer periphery of sheath layer, the material of protective layer is polyether polyurethane elastomer, shore hardness is (A80-D70).The bending-resistant underwater cable provided by the utility model has pressure resistance and flexibility simultaneously, when bending laying, it can be quickly laid, reduce the degree of difficulty of laying, simultaneously, it can effectively reduce the degree of stress concentration at bending, the risk of fracture at bending is low, and it can stably transmit electric energy.

This utility model relates to the field of battery technology and discloses a single cell and a battery pack, which improves the effective connection area of ​​the current collector and enhances battery performance. The single cell includes: a housing having an inner cavity and a through hole; an electrode assembly disposed in the inner cavity; a terminal post passing through the through hole; and a current collector located axially between the electrode assembly and the terminal post, including a central portion connected to and electrically conductive with the terminal post and an edge structure connected to and electrically conductive with the electrode assembly; the edge structure includes at least two connecting portions and at least two welding portions, the connecting portions and welding portions circumferentially surrounding the central portion and alternately arranged; the welding portions and the central portion are respectively connected to the two ends of the connecting portions radially; a first gap is provided between the welding portion and the central portion, and a second gap is provided between the welding portion and the adjacent connecting portion; the first gap and the second gap penetrate the current collector axially, and the first gap between each welding portion and the central portion connects the welding portion to the second gap between the welding portion and the adjacent connecting portion.

The utility model relates to a solar cell and a photovoltaic assembly. The solar cell comprises a silicon wafer, and a first intrinsic amorphous silicon layer, a first doping layer, a first TCO layer and a first metal electrode are sequentially stacked on the first surface of the silicon wafer; a second intrinsic amorphous silicon layer, a second doping layer, a second TCO layer and a second metal electrode are sequentially stacked on the second surface of the silicon wafer; the edge of the first TCO layer extends to cover the side face of the silicon wafer to form a first side face TCO layer, the edge of the second TCO layer extends to cover the side face of the silicon wafer to form a second side face TCO layer, and an insulating layer is arranged between the first side face TCO layer and the second side face TCO layer. And the end part of the first side TCO layer and the second TCO layer are separated from each other through a second intrinsic amorphous silicon layer and / or a second doped layer. According to the solar cell, electric leakage of the solar cell can be avoided, the effective coverage area of the TCO layer on the surface of the solar cell is increased, and the photoelectric conversion efficiency of the solar cell is improved.

This invention relates to the field of building construction technology, and discloses a foundation support device and its usage method for building construction. The device includes a base, a folding mechanism mounted on the base, and a support mechanism driven to rotate by the folding mechanism. The folding mechanism includes a first hydraulic cylinder mounted on the base, with L-shaped rods on both sides of the first hydraulic cylinder. Symmetrically hinged to the base are swing rods driven to swing by the L-shaped rods. The outer walls of the two swing rods are respectively connected to C-shaped brackets via two Y-shaped rods. A sliding groove is formed on one side of the C-shaped bracket, and a sliding frame is slidably connected within the groove. The support mechanism includes a row of first support plates fixedly mounted on the sliding frames. By installing a leveling component on the support mechanism, before supporting the foundation sidewall, the first support plate drives the leveling component to move left and right, leveling the foundation sidewall and ensuring a flat contact surface between the foundation sidewall and the first support plate, thus enabling the support mechanism to effectively support the foundation.

The invention discloses an electric tool, and belongs to the technical field of tools. The electric tool comprises a functional part, a driving assembly and a counterweight assembly. The functional part is used for acting on a workpiece. The driving assembly is connected with the functional part and used for driving the functional part to move; the counterweight assembly is arranged on the functional part in a swinging mode and used for providing pressure for the functional part. According to the scheme, the functional part can be better attached to the workpiece, then the problems of suspension and insufficient contact can be remarkably reduced, the effective action area of the functional part and the workpiece is larger, and therefore the machining efficiency can be effectively improved, and the finished product quality of the workpiece can be improved.

The invention provides a gate all-around field effect transistor. The gate all-around field effect transistor comprises a semiconductor substrate, a source region, a drain region, a gate structure and a plurality of nano structures, the gate structure comprises a plurality of spaced through holes, the penetrating direction of the through holes is parallel to the upper surface of the semiconductor substrate, the through holes are filled with the nanostructures respectively, and the source region and the drain region are arranged at the two ends of the nanostructures respectively; each nanostructure comprises an inner core region and a shell region wrapping the inner core region, the inner core region is a doped region with the same doping type as the source region, and the shell region and the inner core region are semiconductor structures with different doping types; and under the condition that the gate all-around field effect transistor is in a turn-off state, the inner core region and the shell region are all depleted regions. The effective area of the device can be greatly increased under the condition that the size of the original device is not changed, so that the effective current of the device is increased.