2235 results about "Cell structure" patented technology

The present invention relates to a radially collapsible frame (1) for a prosthetic valve, the frame (1) comprising an outflow end region (3) at a proximal end of the frame (1) and an inflow end region (2) at a distal end of the frame (1), opposite to the outflow end region (3). The frame (1) further includes at least two radially spaced commissure attachment regions 910, 10′, 10″) and a cell structure (30), composed of a plurality of lattice cells being arranged radially around a flow axis of the frame (1) and connecting the at least two commissure attachment regions (10, 10′, 10″). Finally, at least one anchoring / positioning arch (20, 20′, 20″) is provided, wherein said at least one anchoring / positioning arch (20, 20′, 20″) radially overlaps the cell structure (30) at least partially. In order to form the inventive frame from as a single piece, the invention further relates to a method comprising bending the at least one anchoring / positioning arch (20, 20′, 20″) towards the cell structure (30) of the frame (1).

The invention relates to a triangular rotating rigid body structure with compression and torsion characteristics, and belongs to the field of mechanical metamaterials, the triangular rotating rigid body structure comprises two kinds of tension cell element structures, and each cell element structure comprises a three-rod tension integral structure assembly and a degree-of-freedom constraint assembly. Under the action of a three-rod nine-cable tension integral structure, when the structure is not subjected to external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of external load, the upper surface and the lower surface of the cell element structure can generate a torsion effect, and the structure can recover to the initial state after the external load is removed again. The triangular rotating rigid body structure with the compression torsion characteristic has the advantages of self-adaptability, self-recovery, indentation resistance characteristic and the like. The tensegrity structure and the mechanical metamaterial structure are combined, the types of existing mechanical metamaterial cell element structures are enriched, and a brand new direction is opened up for design, analysis and application of the tensegrity mechanical metamaterial structure.

The invention provides a machine learning potential function design method for UO2 and a fission product thereof, and the method comprises the steps: S1, constructing a UO2-Xe / I unit cell with the fission product, and carrying out the optimization of the UO2-Xe / I unit cell; s2, the optimized UO2-Xe / I unit cell structure is disturbed and simulated, and a training data set is generated; s3, establishing a machine learning potential function; s4, performing molecular dynamics simulation on the machine learning potential function; s5, performing density functional theory calculation on the candidate configuration to obtain accurate structure-energy-force data, and repeating the steps S3 to S5 to perform iterative calculation; s6, verifying the trained machine learning potential function to obtain an accurate machine learning potential function; and S7, performing molecular dynamics simulation by using an accurate machine learning potential function. The precise DP model is obtained through machine learning, and a theoretical basis is provided for research of a diffusion mechanism of fission products in UO2 and molecular dynamics simulation of other mechanical properties.

The invention provides a novel adjustable partition type alkaline electrolytic cell technology and a matched electrolysis cell structure, and belongs to the technical field of alkaline water electrolysis hydrogen production. According to the technology, a flow channel of an alkaline water electrolysis device is changed to be four-in and four-out and is divided into four areas, and the flow of each area is independently adjusted; a hydrogen molecule detector is arranged on the gas outlet side, the opening degree of a liquid inlet adjusting valve is controlled according to a detection result, dynamic adjustment is achieved, and flow balance is guaranteed; the small electrolysis chamber comprises a pole frame, a pole plate, a diaphragm and an electrode net, the pole frame is in four-partition design, and a vertical partition plate is added to enhance the rigidity; the pole plate is divided into three phases and the mastoid structure is optimized; the diaphragm is designed in a split manner; the electrode net is optimized according to the polar plate. The process and the structure are optimized, the electrolysis efficiency is improved, the structural safety is enhanced, the energy consumption is reduced, and good application prospects are achieved in the field of hydrogen production through alkaline electrolysis of water.

The utility model provides an adapter piece structure, cell structure and energy storage big battery, adapter piece structure includes tab connecting part and post connecting part, tab connecting part is used for connecting with the tab of cell, post connecting part is connected with tab connecting part, post connecting part has first side, first side has the cleaning area that is used for the cleaning treatment, the first side has the cleaning area that is used for the cleaning treatment, the second side has the cleaning area that is used for the cleaning treatment. The cleaning area comprises a welding area and an annular area surrounding the periphery of the welding area, and the welding area is used for welding and fixing the pole connecting part and the pole of the cover plate, so that the welding area is ensured to be in a clean state before welding, the influence of impurities, oxides and the like on the welding quality is avoided, and the welding strength and reliability are improved; due to the existence of the annular area surrounding the welding area, external pollutants can be prevented from invading the welding area in the welding or connecting process, so that the purity and the stability of connection are improved, and high-quality welding of the pole connecting part and the pole can be ensured.

The invention relates to a P-type double-sided passivation selective contact TOPCon cell structure and a preparation method thereof, and belongs to the technical field of solar cells. According to the cell prepared by the invention, the short-circuit current and the photoelectric conversion photoelectric efficiency are improved, a polycrystalline silicon doping layer and a tunneling oxide layer in a non-metal contact region outside a front electrode position are removed through laser film opening, and a selective local contact structure is formed in a metal contact region at the electrode position; current parasitic absorption and contact recombination between metal and the surface of crystalline silicon are reduced; the PN junction is manufactured on the back face, front face light absorption is prevented from being affected, low-power laser is adopted to ensure that the back face PN junction is not damaged by the laser in a non-metal contact area outside the back face electrode position, and then back face current parasitic absorption is greatly reduced by etching and cleaning a back face tunneling oxide layer of the area.

The invention relates to a Citrus Huanglongbing detection device and detection method based on a visual image. According to the method, a visual image and a biophysical image of a to-be-detected citrus leaf are obtained, targeted preprocessing and feature extraction are performed on the visual image and the biophysical image to form a comprehensive feature vector, then the comprehensive feature vector is input into a trained citrus huanglongbing detection model, and finally a detection result is obtained. According to the method, multi-source image information can be fully fused, the limitation that early lesion features are not obvious when the citrus leaf huanglongbing is detected only by depending on a visual image in the immature fruit period is overcome, and multi-dimensional features of leaf appearance, physiological metabolism and cell structure changes caused by the huanglongbing are accurately captured; therefore, the accuracy and the early diagnosis capability of citrus huanglongbing detection are remarkably improved, the citrus planting industry is effectively assisted in timely disease prevention and control, the economic loss is reduced, and the fruit quality and yield are guaranteed.

The utility model provides a TOPCON cell structure, which belongs to the technical field of solar cells and comprises an N-type silicon substrate, and a tunneling silicon oxide layer, a transparent conducting layer, a polycrystalline silicon layer, a back silicon nitride layer and a back metal electrode are sequentially arranged on the back of the N-type silicon substrate from inside to outside. A P-type emitting electrode, an aluminum oxide film layer, a front silicon nitride layer and a front metal electrode are sequentially arranged on the front surface of the substrate from inside to outside; a rough structure is arranged on the surface, connected with the polycrystalline silicon layer, of the transparent conducting layer. The ultrathin transparent conductive layer is inserted between the silicon oxide layer and the polycrystalline silicon layer, the interface, adjacent to the silicon oxide layer, of the transparent conductive layer is a plane, and the interface, adjacent to the polycrystalline silicon layer, of the transparent conductive layer is a rough diffuse reflection surface, so that the direction of light rays incident to the surface can be randomized, the total reflection proportion is increased, and the light ray escape loss is reduced; therefore, the light absorption effect is improved and the cell conversion efficiency is improved.

The invention relates to a phosphoric acid pyrophosphate composite polyanionic positive electrode material for a sodium-ion battery, a preparation method and application of the positive electrode material in the sodium-ion battery. The pyrophosphate composite polyanionic positive electrode has a structure as shown in a formula I: Na4Fe3-x-1. 5y-zMnxVyAz (PO4) 2P2O7 (at) C; when the pyrophosphate composite polyanionic positive electrode has the structure as shown in the formula I, x is more than 1.5 and less than 2.8; and 2) A is selected from one or two of Mg < 2 + >, Al < 3 + >, Cr < 3 + >, Ga < 3 + >, Co < 2 + >, Ni < 2 + >, Cu < 2 + >, Zn < 2 + >, Ge < 2 + >, Zr < 4 + >, Nb < 3 + / 4 + >, Mo < 3 + >, In < 3 + >, Sn < 4 + >, Sb < 3 + >, Te < 4 + >, Ce < 4 + >, Pr < 4 + >, Nd < 3 + >, Pm < 3 + >, Ta < 3 + / 4 + >, W < 4 + >, Bi < 5 + >, Po6 < + >, Cm < 4 + > and Bk < 4 + >. The ionic conductivity and the electronic conductivity of the material are improved through unit cell structure regulation and

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The invention belongs to the technical field of metamaterials, and particularly relates to a diamond substrate lattice metamaterial and an additive manufacturing method thereof. The structure is designed based on the geometric configuration of a diamond lattice, and has excellent high specific absorption mechanical properties. The design process comprises the following steps: firstly, carrying out spatial registration positioning on the basis of a unit cell structure with a preset wall thickness t and a unit cell width a; then, through a multi-unit-cell splicing design, the unit cells are spliced repeatedly for 12 times to form three-dimensional periodic stacking; then, the stacked structure is cut along the six datum planes; then cross plates are inserted into the six cutting faces respectively to enhance the integrity and strength of the structure; and finally, a complete DM plate lattice metamaterial structure is formed. The structure is provided with a plate-plate cross supporting framework, a complex three-dimensional inner cavity and highly symmetrical space distribution, the energy absorption capacity under unit mass is greatly improved, the mechanical properties are basically consistent in multiple directions, and the structure is suitable for the engineering fields of impact protection, energy absorption buffering and the like.

The invention relates to a modeling, designing and optimizing method for a three-dimensional annular buffering and energy-absorbing lattice structure based on additive manufacturing, and belongs to the field of lattice structure modeling, designing and optimizing. The purpose is to improve the light weight and impact resistance and energy absorption capacity of structural equipment. The method integrates the advantages of a negative Poisson's ratio lattice unit cell structure and an additive manufacturing technology, and comprises the following specific implementation steps of innovative three-dimensional lattice unit cell design, key geometric parameter definition, finite element analysis model preparation, convergence verification, parameter analysis and performance evaluation, training set construction, mapping model establishment and multi-objective optimization. The method has the remarkable advantages that the constraint of the additive manufacturing process is considered, the buffer energy absorption performance is remarkably optimized, and beneficial guidance and reference can be provided for related engineering practice.

The invention discloses a topological optimization method and device for a continuous fiber periodic unit cell structure, and relates to the technical field of continuous fiber reinforced composite 3D printing. Determining the configuration of the selected periodic unit cell structure; constructing a feature component in a design domain of a periodic unit cell, performing projection on a fiber angle to calculate an elastic matrix, and determining a weight coefficient in an overlapping region based on a component level set function so as to solve an equivalent elastic matrix; solving the equivalent elastic property of the periodic unit cells of the fiber reinforced composite material; constructing a unit constitutive matrix in an interpolation format; constructing a periodic unit cell structure topological optimization model by taking the flexibility as a target function; calculating the derivative of the flexibility about the design variable formed by the artificial density of the alternative unit cell material, and carrying out sensitivity filtering treatment; optimization iterative analysis is carried out under different working conditions, and the convergence degree of an optimization result is evaluated by using an inequality relation. The problem of how to further improve the mechanical performance of the periodic unit cell structure is solved.

The invention discloses a passivation contact cell structure and a preparation method thereof, the structure comprises a silicon substrate, and the back surface of the silicon substrate comprises a metal contact area and a non-metal contact area; a metal contact area on the back face of the silicon substrate is of a suede structure, and the suede structure is sequentially provided with a back face first tunneling oxide layer, a back face first doped polycrystalline silicon layer, a back face second tunneling oxide layer, a back face second doped polycrystalline silicon layer, a back face aluminum oxide layer, a back face silicon nitride layer and a back face electrode in a stacked mode from inside to outside. A non-metal contact area on the back face of the silicon substrate is of a polished face structure, and a first back face tunneling oxide layer, a first back face doped polycrystalline silicon layer, a back face aluminum oxide layer and a back face silicon nitride layer are sequentially arranged on the polished face structure in a stacked mode from inside to outside. According to the battery structure, parasitic absorption can be reduced, current gain is brought, diffusion of silver ions in electrode slurry can be inhibited, and metal recombination is improved; the interface contact resistance can be obviously improved, and the cell efficiency can be improved.

A continuous fiber reinforced composite topological lattice structure design and 3D printing method comprises the steps that firstly, the elastic tensor of a unit cell structure of a 3D printing continuous fiber reinforced composite is represented, then a topological optimization model of the unit cell structure of the continuous fiber reinforced composite is constructed and divided into sub-regions, fiber tracks are generated for the sub-regions, and finally the topological lattice structure of the continuous fiber reinforced composite is obtained. The arrangement angle of the unit cell structures is calculated, the unit cell structures are periodically filled, and fiber tracks in the sub-regions are obtained; secondly, extracting fiber tracks of the sub-regions, obtaining minimum printing paths of the fiber tracks in each sub-region in combination with a periodic unit cell structure printing form, and connecting to obtain 3D printing sub-paths; then the 3D printing sub-paths are connected to obtain a 3D printing path of the continuous fiber reinforced composite topological lattice structure, and G-codes are generated in combination with the printing speed and the material feeding rate and used for sample piece manufacturing of a 3D printer; the manufacturing requirements of continuous fiber 3D printing are met.

The invention provides a solar cell and a photovoltaic module, and the solar cell comprises a semiconductor substrate which is provided with a first surface and a second surface which are opposite to each other; the doped semiconductor layer is arranged on the first surface of the semiconductor substrate; the dielectric layer is arranged on one side, deviating from the semiconductor substrate, of the doped semiconductor layer; the dielectric layer comprises a plurality of openings, and the openings expose a partial region of the doped semiconductor layer; a plurality of holes are formed in one side, far away from the semiconductor substrate, of the part, exposed at the opening, of the doped semiconductor layer; wherein the number of the unit area holes located in the middle area of the opening is larger than the number of the unit area holes located in the edge area of the opening; the electrode is arranged on the side, away from the semiconductor substrate, of the dielectric layer, and the electrode penetrates through the opening in the dielectric layer to be electrically connected with the doped semiconductor layer. According to the solar cell, the binding force between the electrode and the doped semiconductor layer is enhanced, and the stability of the cell structure is improved.

A non-volatile memory chip comprises a cell region that includes a first surface, a second surface opposite to the first surface, a first cell structure, and a second cell structure spaced apart from the first cell structure; a peripheral circuit region on the first surface of the cell region, and that includes a first peripheral circuit connected to the first cell structure, a second peripheral circuit connected to the second cell structure, and a connection circuit between the first and second peripheral circuits; a through via between the first and second cell structures and that extends from the second surface of the cell region to the connection circuit of the peripheral circuit region; a redistribution layer that covers the through via on the second surface of the cell region, is connected to the through via, and extends along the second surface; and a chip pad connected to the redistribution layer.

The invention relates to the technical field of image processing, and discloses a gynecological cell morphology intelligent identification method and system based on machine vision, and the method comprises the steps: collecting an original image of gynecological cells, carrying out the color normalization processing of the collected original image, carrying out the denoising processing through employing a wavelet threshold value, and carrying out the image enhancement through employing adaptive histogram equalization; according to the method, color consistency errors of different batches of dyed images are reduced, noise introduced in the image acquisition process is eliminated, cell structure details are reserved, and the accuracy of diagnosis is improved. And then image enhancement is carried out, the contrast ratio of cell nucleuses and cytoplasm is improved, so that the characteristics in the cells are more obvious, segmentation can be more accurately completed during subsequent image segmentation, the lesion level of the gynecological cells can be accurately identified, and the accuracy of an identification result is ensured.

The invention relates to a combined type multi-cell structure filling threshold beam assembly. Comprising two C-shaped thin plates and a combined multi-cell structure filling structure. The combined type multi-cell structure filling structure comprises a front end different-plane vertex reinforced multi-cell honeycomb, a rear end coplanar vertex reinforced multi-cell honeycomb and a connecting plate; the front-end different-plane vertex reinforced multi-cell honeycomb comprises a plurality of axially-serially-connected reinforced cell elements which are distributed along the axial direction of the doorsill beam and have orthohexagonal sections; the rear-end coplanar vertex reinforced multi-cell honeycomb comprises a plurality of thin-wall cell elements which are transversely distributed along the threshold beam and have regular hexagonal sections, the plurality of thin-wall cell elements form a coplanar multi-cell honeycomb structure by overlapping boundaries, and the inner sections of the regular hexagons are circular, so that arc-shaped reinforced cell walls are formed at the vertex positions of the regular hexagons; and the radiuses of the internal circles from the middle to the two sides are gradually increased. Large collision energy is transmitted and absorbed when a vehicle is subjected to front-face small-overlap offset collision and side-face collision, and the impact resistance of the threshold beam structure is improved.

The invention discloses a super-junction trench MOSFET structure and a manufacturing method thereof, and belongs to the technical field of super-junction MOSFETs, and the super-junction trench MOSFET structure comprises an N + substrate, a first cellular structure and a second cellular structure. Wherein the first cellular structure and the second cellular structure are both in a regular hexagon shape; the first cell structure comprises a first N column region and a first P column region surrounding the first N column region, and a first source groove is formed in the first N column region; the second cellular structure comprises a second N column region and a second P column region surrounding the second N column region, and a second source groove is formed in the second N column region; the plurality of second cellular structures surround the first cellular structures; the second cellular structure further comprises a gate groove, a first channel is formed between the gate groove and the first source groove, a second channel is formed between the gate groove and the second source groove, and the length of the first channel is different from that of the second channel. According to the invention, by arranging the regularly hexagonal densely laid cellular structure and having the asymmetric double channels, the channel density is improved, and a good gate oxide protection effect is also provided.

A semiconductor memory device is provided. The device includes a cell structure, a peripheral structure, and an interconnection structure sequentially stacked on a support substrate, in which the cell structure includes lower electrodes, a dielectric layer and an upper electrode with the dielectric layer and the upper electrode sequentially covering the lower electrodes, the peripheral structure includes a peripheral substrate and transistors disposed on a front surface of the peripheral substrate, and an upper surface of the upper electrode faces a back surface of the peripheral substrate.

The invention relates to the technical field of grain and oil processing, in particular to a flaxseed microwave-assisted wall breaking and nitrogen protection cold pressing process. The method comprises the following steps: putting flaxseeds into a microwave bin, carrying out intermittent microwave treatment, and carrying out blank rolling treatment on the flaxseeds by adopting a double-helix blank rolling mill to obtain crude oil; and after degumming, deacidifying, decolorizing and deodorizing the crude oil, filtering the crude oil to obtain refined oil. According to the method, the flaxseed cell wall rupture rate is increased through microwave pretreatment, more grease can be released, the grease flow resistance can be reduced, the released grease can be rapidly separated from a fiber network and resorption is reduced through a nitrogen-assisted pressing mode, and after first-time cold pressing, oil cakes are subjected to secondary microwave treatment, so that the flaxseed oil yield is improved. The method can further destroy residual cell structures, and can prevent oil cake hardening caused by oxidation under the protection of nitrogen, so that the oil yield during secondary repressing is increased.

The invention relates to the technical field of food processing, and provides a tremella beverage processing device and process capable of freezing, breaking walls and locking freshness and a beverage, the tremella beverage processing device comprises a freezing box, and further comprises an inner ring cylinder arranged on the inner wall of the freezing box, and an annular isolation cavity is formed between the inner ring cylinder and the outer inner wall of the freezing box; a vertical column is arranged in the middle of the inner ring cylinder, three erecting halfpace are installed on the vertical column at equal intervals, three hanging grooves are annularly formed in the top of each erecting halfpace at equal intervals, fan-shaped inclined hole plates with hanging blocks installed at the bottoms are clamped in the hanging grooves, and inserting openings are formed in the outer sides of the fan-shaped inclined hole plates. The two sets of airflow arc nets are installed at the top and the bottom of the fan-shaped inclined hole plate correspondingly, and each airflow arc net is composed of a plurality of single arc pipes. When the device is used, material accumulation is avoided through three-dimensional layered suspension and two-way airflow coverage, temperature gradient difference between the upper layer and the lower layer is avoided by combining magnetic control cold air access, damage to tremella cell structures is avoided, and the effect of freezing and fresh-keeping of tremella is guaranteed.

The invention discloses a novel chemical material liquid optical granularity instrument with an anti-corrosion sample pool structure, and relates to the technical field of novel chemical material detection.The novel chemical material liquid optical granularity instrument comprises a pool body and a detection assembly, a sealing cover is arranged at the top of the pool body, a stirring assembly is arranged in the middle of the sealing cover, and the detection assembly is arranged at the top of the stirring assembly; the detection assembly comprises a connecting rod, the top of the stirring assembly is rotationally connected with the connecting rod, and one end of the connecting rod is rotationally connected with a piston rod. The gear set driven by the motor drives the stirring shaft to rotate, so that samples are uniformly mixed by the stirring rod, particle sedimentation is prevented, stirring motion is converted into reciprocating motion of the piston rod by utilizing the connecting rod mechanism, and continuous pumping of a medium is realized by matching with a plurality of one-way valves; meanwhile, the liquid suction head on the stirring rod synchronously sucks samples from different point positions in the rotating process, a dynamic multi-point sampling mode is formed, and accidental errors caused by traditional fixed point sampling are effectively overcome.

The invention provides a unit cell structure design method and device based on nickel-titanium shape memory alloy, and relates to the technical field of intelligent materials and structures.The method includes the steps that relevant characteristic parameters of nickel-titanium alloy are collected, a mechanical property index, a thermal stability index and a reliability index are generated, and then a phase change temperature index is obtained through comprehensive calculation; and the phase change temperature threshold is corrected, the geometrical shape and the bonding mode of the unit cell structure are determined, and the quasi-zero-stiffness curved beam, the supporting frame and the connecting part of the unit cell structure are optimally designed in combination with the corrected phase change temperature threshold. According to the method, through characteristic parameter pretreatment, mechanical property index calculation and unit cell structure geometric optimization of the nickel-titanium shape memory alloy, the excellent performance under different phase change states is achieved, and the buffering energy absorption and low-frequency vibration isolation functions of the alloy are improved.

The invention discloses a self-adaptive impact-resistant protective metamaterial with a Poisson's ratio autonomous constraint function, which comprises a PMP honeycomb, the PMP honeycomb comprises a plurality of honeycomb unit cell structures, and each honeycomb unit cell structure comprises a hexagonal thin-wall structure I and a hexagonal thin-wall structure II internally connected in the hexagonal thin-wall structure I. The invention further discloses a preparation method of the self-adaptive impact-resistant protective metamaterial with the Poisson's ratio autonomous constraint function. Compared with an SHC honeycomb, the PMP honeycomb has the advantages that the dynamic Poisson ratio of the PMP honeycomb is relatively stable in the whole crushing process, and the initial fluctuation range is only 0.1. In addition, the average dynamic Poisson's ratio of the PMP honeycomb is relatively small, indicating that the PMP honeycomb is almost free of transverse deformation without additional assistance. After the PMP honeycomb is compressed to be densified, the transverse length of the PMP honeycomb is only increased by 3.5%. Wherein the PMP honeycomb has better self-constraint capability, so that the PMP honeycomb has a more stable energy absorption mode.

The present invention relates to a radially collapsible frame (1) for a prosthetic valve, the frame (1) comprising an outflow end region (3) at a proximal end of the frame (1) and an inflow end region (2) at a distal end of the frame (1), opposite to the outflow end region (3). The frame (1) further includes at least two radially spaced commissure attachment regions 910, 10′, 10″) and a cell structure (30), composed of a plurality of lattice cells being arranged radially around a flow axis of the frame (1) and connecting the at least two commissure attachment regions (10, 10′, 10″). Finally, at least one anchoring / positioning arch (20, 20′, 20″) is provided, wherein said at least one anchoring / positioning arch (20, 20′, 20″) radially overlaps the cell structure (30) at least partially. In order to form the Inventive frame from as a single piece, the invention further relates to a method comprising bending the at least one anchoring / positioning arch (20, 20′, 20″) towards the cell structure (30) of the frame (1).

On a single semiconductor substrate, a main semiconductor device is provided in an active-region operating region and a current sensing portion for detecting overcurrent flowing through the main semiconductor device is provided in a sensing region. The main semiconductor device and the current sensing portion are vertical IGBTs with a trench gate structure. All cells of the main semiconductor device have a CS region. Some of the cells of the current sensing portion have the same structure as the structure of the cells of the main semiconductor device while some of the cells have a structure that is free of CS regions but otherwise the same as the structure of the cells of the main semiconductor device. An average carrier concentration of the CS regions per unit area of the sensing region is less than that of the CS regions per unit area of the active-region operating region.

The invention discloses a multi-cell energy-absorbing thin-walled tube based on a paper folding structure, which belongs to the technical field of structural mechanics and comprises a thin-walled inner tube, a thin-walled outer tube and a plurality of rib plates. Each layer of unit cell structure is defined by n unit wall plates in an end-to-end connection mode, each unit wall plate comprises an upper trapezoidal unit plate and a lower trapezoidal unit plate which are connected along a first crease, and the left side and the right side of each upper trapezoidal unit plate are connected with upper triangular unit plates along second creases correspondingly. The left side and the right side of the lower trapezoidal unit plate are respectively connected with the lower triangular unit plate along a third crease, and the upper triangular unit plate and the lower triangular unit plate are connected through a fourth crease. According to the multi-cell energy absorption thin-walled tube based on the paper folding structure, the thin-walled inner tube and the thin-walled outer tube which are of the paper folding structure are compounded through the rib plates, higher average crushing force is obtained through the compound design, and therefore the load stability of the structure is improved; the deformation process of the multi-cell energy-absorbing thin-walled tube is stable and controllable through specific crease lines and geometric shape design.

The invention discloses a food freezing system based on electrode coupling and a multi-stage electric field and a freezing method thereof. The system comprises an electric field generating device (1), a refrigeration house (2), a space plate type discharge electrode (3), a metal frame discharge electrode (4) and the like. According to the freezing method, a discharge electrode is used for being coupled with an electric field, a special'superposed electric field effect 'is generated, the freezing efficiency is remarkably improved, heat conduction inside and on the surface of food can be accelerated, uniform and rapid crystallization of water is promoted, large ice crystals are effectively prevented from being formed, and therefore damage to cell structures is reduced. Compared with a traditional freezing method, the freezing time can be shortened by 15%-30%, and the juice loss rate is reduced by 3%-6%. Due to the synergistic effect of the double electric fields in different stages, the food can be quickly frozen under lower voltage, and the comprehensive energy consumption can be reduced by 15-30% while the safety is ensured. The method is suitable for large-scale food freezing application, and remarkable technical progress and economic benefits can be brought to the food freezing industry.