57results about How to "Guaranteed current carrying capacity" patented technology

The invention relates to a whitening ultraviolet-proof double-shield instrument cable for ships and a manufacturing method thereof. The cable is characterized in that a whitening ultraviolet-proof ethylene-propylene rubber insulation layer is extruded at the periphery of a tin-plated annealed stranded copper conductor to form an insulation wire core; every two insulation wire cores are twisted to form twisted wire pairs; each twisted wire pair is wrapped with a wire core copper foil polyester composite tape shielding layer at the periphery; the wire core copper foil polyester composite tape shielding layers are each wrapped with a wire core polyester tape at the periphery to form a pair-twist group; all the pair-twist groups are stranded to the right at 16-24 times of stranding lay ratio to form a cable core; the cable core is wrapped with a cable core copper foil polyester composite tape shielding layer at the periphery; the cable core copper foil polyester composite tape shielding layer is wrapped with a cable core polyester tape at the periphery; an inner sheath is extruded at the periphery of the cable core polyester tape; the inner sheath is coated with a copper alloy wire weaving armor layer at the periphery; and an outer sheath is extruded at the periphery of the copper alloy wire weaving armor layer. The insulation layer of the double-shield cable is white in color, good in mechanical property, excellent in anti-ultraviolet irradiation and anti-aging performance, and long in service life.

The invention relates to a processing technology for improving performance of a Fe-based compound superconductive tape. The processing technology for improving performance of a Fe-based compound superconductive tape includes the steps: preparing Fe-based superconductor precursor powder; filling a sheath with the precursor powder to obtain a tube-loading composite; drawing the tube-loading composite into a single-core wire; cutting the single-core wire into a plurality of identical short samples, inserting the identical short samples into the outer sheath to obtain a multi-core composite tube;after the composite tube is drawn into a wire of a certain diameter, repeatedly rolling the wire (during the rolling process, the two ends of the samples are bitten into the roller in turn), and thenobtaining a multi-core tape with certain thickness; and under an Ar atmosphere at 500 to 1100 DEG C, performing final thermal treatment on the obtained Fe-based multi-core tape. Compared with a multi-core tape obtained by a unidirectional rolling technology, the multi-core tape obtained by the processing technology for improving performance of a Fe-based compound superconductive tape through the repeated rolling mode has no cracking phenomenon in each superconductive core of the multi-core tape, and the integrity of the superconductive core is preferable, and the critical transmission currentIc of the tape and the critical engineering current density Je of the tape are significantly improved.

The invention relates to the technical field of ceramic heating units, in particular to a large power ceramic heating unit. The large power ceramic heating unit comprises an aluminum oxide ceramic core and an aluminum oxide ceramic substrate, thick film heating circuits are printed on the inner side face of the aluminum oxide ceramic substrate, the thick film heating circuits are of a reciprocating inflection structure, the distance H is formed between two adjacent thick film heating circuits, the aluminum oxide substrate wraps the outer side face of the aluminum oxide ceramic core in a reeling shape, the width L of wires of the thick film heating circuits is 0.3-1.3mm, and the ratio H / L of the distance H formed by the thick film heating circuits and the width L of the wires of the thick is 0.5-1.5; the thickness T of the aluminum oxide substrate is 0.3-0.8 mm, and the ratio W / T of the thickness of the wall of the aluminum oxide ceramic core and the thickness T of the aluminum oxide substrate is 2-5. When the large power ceramic heating unit works, the power of the large power ceramic heating unit can be more than 3000W, the breakthrough that a small-sized heating unit carries out large-power heating is achieved, the temperature of the surface of the heating unit is kept uniform, generated bubbles are small and are not prone to being attached to the surface of the heating unit, and durability is extraordinary.

The invention relates to a tower for a wind turbine and to a cable guide for a tower of a wind turbine, wherein a machine housing for the wind turbine is arranged on the tower such that it can rotate by means of the azimuth bearing about a vertical axis which runs in the longitudinal direction of the tower. Current-carrying cables, such as power cables, are routed in the tower of the wind turbine out of the machine housing from electrical components to the ground. These comprise a multiplicity of cables, for example a plurality of cables for electrically carrying individual phases of alternating current, in particular three-phase alternating current, cables for ground conductors and / or signal and control cables. One object of the invention is to specify improved routing of the cables which, inter alia, avoids the disadvantages of the prior art.; One particular aim is to ensure that the current load capacity of the cables is ensured, and / or that wear between the cables is reduced. According to the invention, the object is achieved by the features of the main claim 1, by arranging a guide apparatus effectively between the cable loom and the tower, in the tower, for at least partial fixing of the area of the cable loom to the tower, wherein the guide apparatus has means for supporting the lower area of the cable loom in a radial direction, and for support with respect to the tower in a circumferential direction. In this case, the guide apparatus is designed such that the lower area of the cable loom is mounted such that it can move in the axial direction with respect to the tower, but is essentially fixed with respect to the tower in the circumferential and radial directions.

The invention discloses an expansion joint for a conductive rail. The expansion joint for the conductive rail comprises a left conductive rail, a middle rail and a right conductive rail, wherein the right end face of the left conductive rail, the two end faces of the middle rail and the left end face of the right conductive rail are mutually-parallel inclined planes; the expansion joint further comprises a conductive plate and wires; the conductive plate is provided with a boss part fixedly connected to the bottom surface of the middle rail; the left end and the right end of the conductive plate are suspended; the wires consist of a left wire and a right wire; one end of the left wire is connected to the bottom surface of the left conductive rail, and the other end is connected to the suspended left end of the conductive plate; one end of the right wire is connected to the bottom of the right conductive rail, and the other end is connected to the suspended right end of the conductive plate; the wires keep in a relax state after being connected; and the expansion joint further comprises a copper-aluminum transition plate. The expansion joint provided by the invention has a simple structure, is excellent in pickproof and shock-resistant performance, can effectively ensure requirements of follow current and current carrying on the expansion joint, and can ensure constant and reliable current capacity.

The invention relates to a preparation method of a superconducting D-type coil for magnetic confinement fusion, which comprises the following steps: A, preparation of a coil framework: processing a high-strength metal circular tube into a D-type shape to obtain the coil framework; B, coil winding: spirally winding a plurality of high-temperature superconducting strips on the coil framework side byside to form a plurality of coil winding layers, and staggering the high-temperature superconducting strips of the adjacent winding layers by a distance of 1 / 2-1 / 3 of the width of the strips; and obtaining a superconducting D-type coil blank; C, coil curing: performing epoxy resin impregnation curing or paraffin impregnation curing on the superconducting D-type coil blank to obtain the cured superconducting D-type coil; and D, armor reinforcement: wrapping the cured superconducting D-type coil with a wrapping sleeve composed of an upper half tube and a lower half tube, and performing impregnation and curing again to obtain the superconducting D-type coil. The superconducting D-type coil prepared by the method is high in percent of pass, good in current-carrying performance and high in mechanical strength, and can generate a stronger strong magnetic field in a large space.

The invention relates to a marine independent screening instrument cable capable of whitening and resisting ultraviolet and a manufacturing method thereof. Whitening and ultraviolet-resisting ethylene propylene rubber insulation layers are extruded at the peripheries of tin-plating annealing stranded copper conductors to form insulation wire cores, every two insulation wire cores are stranded to form a stranded wire pair, a copper foil polyester composite belt screening layer is lapped at the periphery of each group of stranded wire pair, copper foil surfaces are inward, tin-plating stranded steel drainage wires are arranged on the inner sides of the copper foil polyester composite belt screening layers, penetrate through the full length of each stranded pair and cling together with the copper foil surfaces; and a polyester belt is lapped at the periphery of each copper foil polyester composite belt screening layer to form a stranded group; and the all stranded groups are stranded rightwards according to the 16-24 times of stranded node ratio to form a cable core, an inner protecting bush is extruded at the periphery of the cable core, a copper alloy wire knitting armor layer covers the periphery of the inner protecting bush, and an outer protecting bush is extruded at the periphery of the copper alloy wire knitting armor layer. The independent screening instrument cable has the advantages that the color of an insulation layer is white, the mechanical property is good, the performance of resisting aging caused by ultraviolet light is excellent, and the service life is long.

The invention relates to an insulating tube type busbar and a manufacturing method thereof in the technical field of high voltage distribution. The insulating tube type busbar comprises: an insulatingtube type busbar conductor, an internal conductive pipe or a plurality of leads, radiating holes, radiating spaces inside the pipe and end plate open pores, wherein the insulating tube type busbar conductor is arranged at the outermost layer and is internally provided with the internal conductive pipe; and the end part of the insulating tube type busbar conductor is provided with the radiating holes. By utilizing the hollow insulating tube type busbar conductor, a conductor is added in the insulating tube type busbar conductor, the hollow conductor of the insulating tube type busbar is internally stuffed with the conductive pipe, or a plurality of corresponding leads and presses the end part thereof into a whole; radiating and temperature reduction measures are taken, and the end part ofthe insulating busbar is provided with radiating holes, therefore, the current-carrying capacity can be increased without increasing the external diameter size of the busbar, thus reducing the using amount of insulation materials and lowering cost.

The invention relates to a marine integral screening instrument cable capable of whitening and resisting ultraviolet and a manufacturing method thereof. Whitening and ultraviolet-resisting ethylene propylene rubber insulation layers are extruded at the peripheries of tin-plating annealing stranded copper conductors to form insulation wire cores, every two insulation wire cores are stranded to form a stranded wire pair, the all stranded wire pairs are stranded rightwards according to the 16-24 times of stranded node ratio to form a cable core, a copper foil polyester composite belt screening layer is lapped at the periphery of the cable core, a copper foil surface is inward, a tin-plating stranded steel drainage wire is arranged on the inner side of the copper foil polyester composite belt screening layer, penetrates through the full length of each stranded pair and clings together with the copper foil surface; and a polyester belt is lapped at the periphery of the copper foil polyester composite belt screening layer, an inner protecting bush is extruded at the periphery of the polyester belt, a copper alloy wire knitting armor layer covers the periphery of the inner protecting bush, and an outer protecting bush is extruded at the periphery of the copper alloy wire knitting armor layer. The integral screening instrument cable has the advantages that the color of an insulation layer is white, the mechanical property is good, the performance of resisting aging caused by ultraviolet light is excellent, and the service life is long.

The invention relates to a connecting method of a second-generation high-temperature superconducting tape and a superconducting wire. The connecting method comprises the following steps: removing a protection layer: removing a silver layer of a part of a to-be-connected region of the second-generation high-temperature superconducting tape, and enabling the remaining silver layer and the exposed superconducting layer to be distributed at intervals; carrying out silver layer diffusion welding: making every two to-be-connected regions of at least two second-generation high-temperature superconducting tapes processed through the protection layer removing step in lap joint to form a lap joint area, making the remaining silver layers make contact in an overlapped mode, then, clamping the lap joint areas, and carrying out diffusion welding on the silver layers; performing fusion diffusion welding on the superconducting layer; and carrying out superconductivity recovery. According to the method, the structure of the superconducting layer is not damaged, meanwhile, an oxygen diffusion channel can be provided; the prepared superconducting joint has the superconducting characteristic in a liquid nitrogen temperature zone and also has high mechanical strength, and meanwhile, current can pass through the residual silver layer, so that the superconducting joint further has certain quench protection capacity.

The invention discloses a diamond-based multi-channel barrier regulation and control field-effect transistor and a preparation method thereof. The field-effect transistor comprises a diamond substrate, and is characterized in that the diamond substrate is provided with a single crystal diamond epitaxial film; the single crystal diamond epitaxial film is provided with mesa regions; the single crystal diamond epitaxial film is provided with etching regions; each mesa region is internally provided with a multi-channel trench region and the etching region; each multi-channel trench region includesa two-dimensional hole gas conductive layer; each etching region includes an oxygen, fluorine or nitrogen terminal; a source electrode and a drain electrode are located at two sides of the mesa regions; and a grid electrode is arranged in the multi-channel trench regions and the etching regions between the source electrode and the drain electrode, and the grid electrode is arranged in the etchingregions on the single crystal diamond epitaxial film at the same time. The transistor device disclosed by the invention can obtain normally-closed characteristics without damaging the performance ofthe conductive trenches. Meanwhile, the multi-channel structure also can ensure the current passing ability between the source and the drain of the device.

The invention relates to a whitening ultraviolet-proof ethylene-propylene rubber insulation control cable for ships and a manufacturing method thereof. The cable is characterized in that a whitening ultraviolet-proof ethylene-propylene rubber insulation layer is extruded at the periphery of a 0.35-2.5mm<2> tin-plated annealed stranded copper conductor to form an insulation wire core; a plurality of insulation wire cores are stranded to the right to form a cable core; and then an inner lining layer is extruded, a copper alloy wire weaving armor layer is coated, and an outer sheath is extruded successively. The insulation layer is prepared from the following raw material components: 12 parts of Keltan5508, 8 parts of Keltan21, 0.4-0.6 part of TAIC, 0.5-0.8 part of DCP (Dicumyl Peroxide), 0.3 -0.6 part of Ager MB, 0.1-0.2 parts of anti-aging agent 2246, 0.8-1.2 parts of oxidation zinc, 0.1-0.3 parts of stearic acid, 1-1.5 parts of rutile-type titanium dioxide, 10-12 parts of lightweight calcium carbonate, 10-12 parts of ultrafine talcum powder, 2-3 parts of 38# cylinder oil, 2-3 parts of vapor-phase-method hydrated silica, 0.05-0.1 parts of an ultraviolet absorbent UV-326, and 0.1-0.3 parts of coupling agent A-174. The insulation layer of the cable is white in color, good in mechanical property, excellent in anti-ultraviolet irradiation and anti-aging performance, and long in service life.

The invention discloses a copper and aluminium transition binding post comprising an aluminium part and a copper part, wherein one end of the aluminium part is connected with a conductor at the bottom end of a cable, the other end is provided with an extension section extending outward, and the diameter size of the solid extension section is smaller than that of the aluminium part; and one end of the copper part is provided with a horizontal extension section having the same size with the extension section of the aluminium part, the other end is provided with a U-shaped bottom plate part, the extension section of the aluminium part and the horizontal extension section of the copper part form an integral neck part, and the aluminium part and the copper part are combined at the cross section part of the neck part. The properties of the copper and aluminium transition binding post meet the requirements for industrial A class connecting hardware. Due to the low grade design of the copper and aluminium binding post, the size of the bottom plate part is reduced to a full extent, and meanwhile, the cross section at the combination part of the copper part and the aluminium part is increased. The connection properties of the product are improved under the condition of ensuring current carrying capability, and the connection of a circuit breaker and a bus bar is facilitated.

The present invention discloses a static spring portion with a buffer function and a magnetic latching relay thereof. The static spring portion comprises a static contact and a static spring; two ends of the static spring are respectively provided with a head and a root fixed with the pedestal of a relay; a static spring extension piece extending to one end of the head is arranged at the middle of the static spring; the static spring extension piece is provides a free end; and the static contact is fixed at the free end of the static spring extension piece. According to the invention, the positioning stability problem of a static spring portion is solved so as to ensure the performance stability of a magnetic latching relay, and the violent rebounding problem of a contact caused by kinetic energy generated by closing the contact is solved so as to improve the electrical life of the magnetic latching relay.

The invention relates to a basin type insulator for high-current electric power transmission equipment. The basin type insulator at least comprises a tube type flange, a connecting conductor and an insulation casting body, and is characterized in that the insulation casting body is in an annular shape, the connecting conductor is arranged in a hole of the annular insulation casting body and is in bilateral symmetry by using the annular insulation casting body as the center, the tube type flange is arranged outside the annular insulation casting body, the upper and lower surfaces, near the excircle part, of the annular insulation casting body are respectively and correspondingly provided with first annular grooves, a first O-shaped sealing ring is arranged in each first groove, the upper and lower surfaces, near the inner circle part, of the tube type flange are respectively and correspondingly provided with second annular grooves, a second O-shaped sealing ring is arranged in each second groove, two ends of the connecting conductor are respectively provided with a plurality of annular conducting grooves, and a spring contact is sheathed on each annular conducting groove. The basin type insulator has the advantages that the problem of usage occasion limitation of the traditional basin type insulator is solved, and in addition, the sealing performance is good.

An embodiment of the invention discloses a printed circuit board, a tinning line thereof and a tinning method thereof, relating to the microelectronic technology field, and welding looseness and tinning unevenness caused by soldering tin mobility can be avoided. The printed circuit board tinning line comprises a plurality of tinning strips which are uniformly distributed. The tinning strips are mutually independent and do no contact each other. The printed circuit board, the tinning line and the tinning method are applied to printing of the printed circuit board.

The invention discloses a high-overload small-volume shunting type manual maintenance switch which comprises a socket and a plug. The socket comprises a socket shell. A slot component is installed onthe socket shell. The upper side of the slot component is connected with a tail protective cover through a buckling cover. The plug comprises a lower cover. The lower cover is provided with a pluggingpiece cooperating with the slot component. The lower part of the plugging piece is connected with the plug shell. The plug shell is provided with a handle. A high-voltage interlocking component is arranged between the socket and the plug. The problem in the prior art that the current carrying capacity of the manual maintenance switch is insufficient can be solved, and the manual maintenance switch has small volume, low cost, high reliability and wide application range.

The invention relates to a whitening ultraviolet-proof ethylene-propylene rubber insulation power cable for ships and a manufacturing method thereof. The cable is characterized in that a whitening ultraviolet-proof ethylene-propylene rubber insulation layer is extruded at the periphery of a tin-plated annealed stranded copper conductor to form an insulation wire core; a plurality of insulation wire cores are stranded to the right to form a cable core; and then an inner lining layer is extruded, a copper alloy wire weaving armor layer is coated, and an outer sheath is extruded successively. The insulation layer is prepared from the following raw material components: 12 parts of Keltan5508, 8 parts of Keltan21, 0.4-0.6 parts of TAIC, 0.5-0.8 parts of DCP (Dicumyl Peroxide), 0.3 -0.6 part of Ager MB, 0.1-0.2 parts of anti-aging agent 2246, 0.8-1.2 parts of oxidation zinc, 0.1-0.3 parts of stearic acid; 1-1.5 parts of a rutile-type titanium dioxide, 10-12 parts of lightweight calcium carbonate, 10-12 parts of ultrafine talcum powder, 2-3 parts of 38# cylinder oil, 2-3 parts of vapor-phase-method hydrated silica, 0.05-0.1 parts of ultraviolet absorbent UV-326, and 0.1-0.3 parts of coupling agent A-174. The insulation layer of the cable is white in color, good in mechanical property, excellent in anti-ultraviolet irradiation and anti-aging performance, and long in service life.

The invention discloses a low height electromagnetic relay which comprises a base, a bobbin wound with enameled wires, an iron core, a yoke, an armature, a compression spring, a moving spring with a pin, a static spring with a pin and a push clamp. The bobbin is horizontally mounted on the base. The yoke is T-shaped and horizontal. The iron core is L-shaped, and the horizontal side of the iron core penetrates in the bobbin. The end surface of the horizontal side of the iron core is a knife edge surface. The vertical side of the iron core is connected with the tail of the yoke. The end surfaceof the head of the yoke is a pole shoe surface. The armature is limited by the compression spring so that the armature is vertical and corresponds to the matching place of the knife edge surface of the iron core and the pole shoe surface of the yoke. The moving spring is provided with a number of curved structures. The initial suction force of the magnetic circuit system is enhanced by utilizing the pole shoe surface of the yoke and the flexibility is enhanced by utilizing a plurality of curved structures of the moving spring so that the low height design of the relay and the two systems reachthe optimal matching state, and the requirement of realizing the small volume of the relay can be met.

The invention discloses a cable current-carrying capacity evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the detailed information of the temperature highest point position of the surface of a cable, the detailed information comprises cable surface temperature information, cable actual structure at the highest point position, surrounding laying environment information and cable real-time load data corresponding to the temperature time sequence record, and establishing a temperature field finite element model according to the cable actual structure and the surrounding laying environment information; inputting the real-time load data of the cable into the temperature field finite element model to obtain a cable surface temperature finite element calculation result and a cable conductor temperature calculation result, and performing evaluation based on the cable surface temperature finite element calculation result, the cable conductor temperature calculation result and the cable surface temperature information in combination with a preset threshold value to obtain the cable surface temperature. And obtaining a cable line current-carrying capacity evaluation result. According to the method for evaluating the current-carrying capacity of the cable, it is guaranteed that the current-carrying capacity of a power transmission cable line is fully exerted.

The invention provides a battery cell of a coiled lithium ion battery. The battery cell is made by overlaying and winding two layers of pole pieces and two layers of diaphragms alternatively, whereineach pole piece comprises a pole piece body and a plurality of leads; the battery cell body is formed by coiling the pole piece bodies; an electrode is formed after the leads are overlaid in a staggered way; the total width of the electrode is D. Compared with the prior art, the battery cell has the beneficial effects that the leads are molded by coiling with a coiling needle after mold cutting, and different circles of leads are not aligned completely in a staggered way, so that the current carrying ability of the leads is ensured, and convenience can be brought to welding.

The invention provides a plant leaf back light supply lamp panel, and relates to the technical field of plant planting. According to the technical scheme, the plant leaf back light supply lamp panel comprises a substrate, wherein a plurality of planting holes arranged in an array mode are formed in the substrate; each row of planting holes is provided with a set of power lines; the power lines comprise first wires, second wires and third wires. Each planting hole corresponds to one plant, a plurality of LED elements are evenly distributed around the planting holes, each plant can obtain uniform bottom light supply, the photosynthesis capacity of the bottom faces of leaves is developed, the overall photosynthesis efficiency of the plants is improved, and the purpose of increasing the yieldis achieved. The planting holes are distributed in the substrate in an array mode, the circuit structure and the circuit width of the first wires, the second wires, the third wires and the like on thesubstrate for supplying power to the LED elements are optimized, crossing, winding and wire jumping are avoided, the length of a power supply circuit is reduced as much as possible, enough width is guaranteed so as to reduce resistance, and the current carrying capacity is guaranteed.

The invention relates to a whitening ultraviolet-proof non-shield instrument cable for ships and a manufacturing method thereof. The cable is characterized in that a whitening ultraviolet-proof ethylene-propylene rubber insulation layer is extruded at the periphery of a 0.35-2.5mm<2> tin-plated annealed stranded copper conductor to form an insulation wire core; every two insulation wire cores are twisted to form twisted groups; all the twisted groups are stranded to the right to form a cable core; and then an inner lining layer is extruded, a copper alloy wire weaving armor layer is coated, and an outer sheath is extruded successively. The insulation layer is prepared from the following raw material components: 12 parts of Keltan5508, 8 parts of Keltan21, 0.4-0.6 parts of TAIC, 0.5-0.8 parts of DCP (Dicumyl Peroxide), 0.3 -0.6 parts of Ager MB, 0.1-0.2 parts of an anti-aging agent 2246, 0.8-1.2 parts of oxidation zinc, 0.1-0.3 parts of stearic acid, 1-1.5 parts of a rutile-type titanium dioxide, 10-12 parts of lightweight calcium carbonate, 10-12 parts of ultrafine talcum powder, 2-3 parts of 38# cylinder oil, 2-3 parts of vapor-phase-method hydrated silica, 0.05-0.1 parts of UV-326, and 0.1-0.3 parts of A-174. The insulation layer of the cable is white in color, good in mechanical property, excellent in anti-ultraviolet irradiation and anti-aging performance, and long in service life.

The invention discloses a shielding method for an armature reaction in a double-stator field modulation superconducting motor, which adopts a double-stator structure, and an inner stator, a rotor and an outer stator are arranged concentrically. Copper wire armature windings are placed on the outer stator, and superconducting magnets wound by superconducting wires are placed on the inner stator, which mainly consists of superconducting coils and cryostats. Arrange the magnetic ring on the outside of the superconducting magnet, rationally design the number of teeth of the outer stator, the number of salient poles of the rotor and the magnetic ring, so that the armature reaction magnetic field can pass through the outer stator, the salient poles of the rotor and the magnetic ring as much as possible, so that It is as far away from the superconducting coil as possible. At the same time, a squirrel-cage damping shielding layer is arranged on the magnetic conducting ring to suppress the fundamental wave and low-order harmonics of the armature reaction, and a copper shielding layer is arranged inside the cryostat to surround the superconducting coil to suppress the high frequency of the armature reaction. subharmonic. The invention can effectively reduce the AC loss in the superconducting winding, and avoid the quenching caused by the excessive AC loss of the superconducting winding.

The invention discloses a diamond-based field effect transistor with a low work function conductive gate and a preparation method thereof. The diamond-based field effect transistor comprises a diamondsubstrate, wherein a single crystal diamond epitaxial film is provided on the diamond substrate; a source and a drain are provided on the single crystal diamond epitaxial film; a conductive channel is formed on the single crystal diamond epitaxial film between the source and the drain; a low work function conductive gate layer is disposed on the conductive channel, and a gate electrode is disposed on the low work function conductive gate layer, wherein the low work function conductive gate layer is in contact with the conductive channel to generate a barrier height that reaches a predetermined threshold for pinching off the channel. The diamond-based field effect transistor provided by the invention utilizes a space charge region generated by a Schottky barrier to completely deplete the two-dimensional hole gas generated on the surface of the hydrogen terminal diamond, and pinch-off the channel to realize the characteristics of a normally-off device, which caused no damage to the performance of the conductive channel while ensuring the current passing capability between the source and drain of the device.

The invention discloses a method for preparing a Bi-2223-Ag multi-core superconductive strip material by adding nano-copper. The method comprises the steps that 1, copper-short Bi-2223 precursor powder is prepared, sintered and subjected to ball milling by adding nano-copper powder, the materials are mixed to be uniform, and then tubing precursor powder is obtained; 2, a tubing compound is prepared in a tubing mode; 3, the tubing compound is processed into a single-core wire material in a drawing mode; 4, the single-core wire material is sequentially sized, cut, strengthened and washed, and then a multi-core wire material is prepared by adopting a bundle drawing method; 5, the multi-core wire material is rolled into the multi-core strip material, and heat treatment is conducted to obtain the Bi-2223-Ag multi-core superconductive strip material. According to the method, part of copper in the Bi-2223 precursor powder is replaced with an appropriate amount of the nano-copper powder, oxygen adsorbed by the powder is absorbed by the nano-copper powder to generate copper oxide in final heat treatment, and therefore influences of an impurity phase on the strip material properties are avoided; in addition, the bubbling phenomenon can be prevented as far as possible on the premise that the current carrying property of the strip material can be guaranteed, and the uniformity of the strip material properties is improved.

The invention relates to a power taking device for a power supply, and particularly relates to a power taking device for a dual-power switching power supply and an operation method thereof, which belong to the field of electrical switches. The device comprises a static contact assembly and a moving contact assembly, wherein the moving contact assembly is inserted into the static contact assembly.The requirements of power consumption continuity and reliability by a user can be met.