298results about How to "No negative impact" patented technology

The invention belongs to the technical field of environmental engineering, in particular to a sludge dehydrating and drying process method and a device. The technical essential points of the invention are that: firstly, adding one or several of fly ash, fine manganese slag, calcined lime, ferric chloride solution and aluminum sulfate solution into sludge and dehydrating and conditioning the sludge; secondly, feeding the sludge into a pre-drying area and simultaneously adding a certain amount of calcined lime, potassium permanganate and finished product of dry sludge and uniformly mixing; feeding the sludge treated in the pre-drying area into a hollow paddle spiral indirect dryer; returning one part of finished product of dry sludge to the pre-drying area and carrying out drier back-mixing with wet sludge; supplying saturated heated steam to a drier by an electric boiler; and introducing steam tail gas from the drier to the pre-drying area for heating the wet sludge. The device is automatically controlled by a control center through a control bus. The process has the advantages of energy saving, environmental protection and high efficiency.

The invention discloses a preparation method and an application of environment-friendly type shield tail sealing grease. The shield tail sealing grease mainly comprises the following components: 14-30% of lubricating oil, 7-22% of oil plasticizer, 3-15% of thickening agent, 3-12% of lubricating grease, 3-8% of natural degradable fiber, 35-60% of filling granular material, 1-3% of coloring agent and 0.1-2% of preservative. The environment-friendly type shield tail sealing grease prepared by using the method is used for sealing a shield tail of a shield tunneling machine in tunnel engineering, and has the advantages of good water pressure sealing performance, excellent pumping performance, high adhesivity, good lubrication, stable properties, no corrosion, antioxidation, wide raw material resources, environment-friendliness and simple preparation process.

The invention relates to a method for preparing a tobacco sheet capable of reducing harmful substances in smoke, which comprises the following steps of: (1) after extracting tobacco powder and tobacco stalks, which are used as the raw materials, by hot water or 75 to 95 mass percent of ethanol, concentrating into tobacco concentrated solution with the solid content of 20 to 55 percent; (2) adding 0.05 to 5 mass percent of metallic oxide, metal salt and a mixture in any ratio into the tobacco concentrated solution; (3) adding 0.05 to 8 percent of inorganic mineral adsorbing material into the tobacco concentrated solution to obtain a composite additive; and (4) coating the tobacco concentrated solution added with the composite additive on a substrate of the tobacco sheet. When the tobacco sheet prepared by the method is burnt, on one hand, the pyrolysis process in the burning process can be catalyzed and the generation of benzene ring substances and the like can be reduced, and on the other hand, generated particle substances with high molecular mass, particularly substances containing benzene rings, are adsorbed into a pore structure of the additive, so that the aim of avoiding the harmful substances being sucked into the mouth is fulfilled.

Intensity data of the signals produced by an ion detector are sequentially stored in a data processor, with each piece of intensity data being associated with time t required for each of the various ions ejected from an ion trap to fly through a time-of-flight space and reach the ion detector. The data obtained within a time range T2 corresponding to a measurement mass range are extracted as profile data. The data obtained within either a time range T1 before the arrival of an ion having the smallest m / z value or a time range T3 after the arrival of an ion having the largest m / z value are extracted as noise component data. Various kinds of noise information such as the noise level or standard deviation are calculated from the noise component data. Based on this noise information, a noise component is removed from the profile data. For every mass scan cycle, the noise component data and profile data are almost simultaneously obtained. Therefore, even if the electrical noise from the ion detector changes with time, the noise can be properly removed with little influence from that change of the noise.

The invention discloses a sub-regional protection type substation fire fighting monitoring and early-warning and fire fighting system which comprises a video unit, a detection device, a fire alarm control device and a fire fighting device, wherein the detection device comprises a temperature sensing cable, a characteristic gas detection device, a linear infrared beam smoke and temperature sensing detector, a point type temperature sensing detector and a point type smoke sensing detector; the fire alarm control device gathers signals collected by the detection device and sends a starting signal to the fire fighting device; the fire fighting device comprises a fire trace tube fire fighting device, a gas storage type total-flooding dry powder extinguishing device, a suspension type dry powder fire extinguisher, an oil-drainage nitrogen-filling device and a water mist fire extinguishing device. According to equipment in each sub region and the combustion characteristic of combustibles of the sub region, the sub-regional protection type substation fire fighting monitoring and early-warning and fire fighting system selects corresponding detection devices and corresponding fire fighting devices for combined distribution, carries out targeted fire detection, early warning and fire fighting arrangement, and comprehensively improves the prevention and fire fighting capability of substations to fire.

The invention discloses an automated training device for behavior learning of non-human primates, wherein a personal computer (PC) is provided with two displays, wherein one of the displays and a camera are respectively positioned in front of an animal seat; a water supply control system comprises a water receiver, a driving control circuit and an electromagnetic valve, wherein the water receiver is connected with the electromagnetic valve through a guide tube, the electromagnetic valve is electrically connected with the driving control circuit, and the driving control circuit is electrically connected with a microcontroller; a swinging rod and a water faucet are fixed on the animal seat, a pressure sensor is fixed on a handle of the swinging rod, the pressure sensor and a potentiometer of the swinging rod are electrically connected with the microcontroller respectively, and the water faucet is connected with the electromagnetic valve of the water supply control system through the guide tube; and the PC is electrically connected with the camera and the microcontroller respectively. The invention can realize a painless automated animal behavior training method, and the camera can be used for displaying and monitoring the animal behavior in real time, thereby greatly improving the training speed and saving human resources.

Disclosed is a method for recovering toluene diamine from a fluid, high-boiling tar residue discharged from TDI preparation processes. After free TDI is separated and recovered from the tar residue, the remaining solid residue is pulverized, slurried and hydrolysis-treated in the presence of a catalyst under the condition of the liquid phase region near a critical point of water to produce toluene diamine, and then the resulting toluene diamine is effectively recovered.

The invention discloses a coal desulfurization method which utilizes microwave to catalyze, which comprises the following steps: utilizing water to be dissolvent, leading coal and auxiliary agent mixture to form more even disperse system through physically stirring, and doing a thermal desulfurization reaction under the catalytic action of microwave. The method has the advantages that firstly, the method has excellent desulfurization efficiency under the premise without damaging coal quality structure, secondly, the method has high reaction efficiency and excellent statute of limitation, thirdly, the method has simple operation, whose auxiliary agent is easy to get, and the method has wide popularization using value.

The invention discloses a dielectric barrier discharge (DBD) plasma trailing edge jetting device and method, relating to a flow control technology. The device comprises a plurality of groups of plasma exciters, insulating media and a high-voltage power supply and is used for improving the flowing at a wake area for the flow around a cylinder, wherein the plasma excitation of certain strength is applied to a proper position at a leeward of the cylinder, the movement of low-velocity flowing bodies in a boundary layer is accelerated to form jet flows on a wake space at the trailing edge of the cylinder, so that a wake low-velocity area can be flattened to further achieve the effects of improving a flow field at the wake area and reducing wake losses pneumatic noises, and the device can be applied to resistance reduction and noise reduction for an aircraft landing gear. The DBD plasma trailing edge jetting device disclosed by the invention has the advantages of simple and compact structure, high reaction speed, low energy consumption and the like.

The invention discloses a triangular connection type comprehensive compensation system integrated with a cascaded active filter and a reactive compensator. The system comprises triangular connection type N-grade cascaded converters and a three-phase filter inductor connected with each N-grade cascaded converter; triangular connection type thyristor reactors and star-shaped connection type thyristors are used for switching the reactive compensator composed of fixed capacitors; and the triangular connection type N-grade cascaded converters and the reactive compensator are connected in parallel between a connection node and a ground node of an input power grid voltage and a load. According to the system provided by the invention, reactive power and harmonic current in a medium-voltage power grid are subjected to dynamic compensation and the efficiency of the power grid is improved; when the system is used for compensating, the system has no negative influences on the power grid, and has advantages of stable system, simple structure, strong stability and flexibility in compensation.

The invention discloses a drying and water-recovering process of heat conduction coal by venturi injecting circulation of tail gas with low oxygen content. The process flow comprises: 1, a coal drying system; 2, a tail gas dust-removal and condensed dehydration system; 3, a circulation gas pre-heating and heating system; and 4, a circulation gas oxygen-content-controlling system. In the process, all systems can cooperate with one another to fully realize respective functions, so that the problem that the system fails to operate for a long period because the high-dew-point dust-contained tail gas entering a dry-process dust collector (cyclone separator, bag type dust collector and electrostatic precipitator) is susceptible to dewing and blocking the dust collector in the traditional inert gas circulation drying process is solved, and the continuous long period operation of the system is guaranteed. The process has the characteristics of energy conservation, environmental protection andsafety.

The invention discloses a super-light resistive random access memory and a preparation method thereof. The super-light resistive random access memory comprises a metal thin-film electrode; a first silk protein film and a second silk protein film cover an upper layer and a lower layer of the metal thin-film electrode respectively; and a silver thin-film electrode covers the first silk protein film. The light silk protein is used as a substrate and is also used as a resistive material, so that the resistive random access memory with the mass per unit area of 4mg / cm<2> can be obtained; and the mass per unit area of the resistive random access memory is smaller than that of the silicon-substrate-based traditional resistive random access memory by over 320 times and is smaller than that of the common A4 paper by over 20 times.

The invention discloses a preparation method of a compound microbial algaecide. The method comprises the following steps: reasonably combining separated and purified extracellular polymeric substances, kaolin and the like so as to prepare a compound microbial flocculant; then fossilizing separated alga dissolving bacteria and algal toxin degrading bacteria; finally, reasonably compounding the compound microbial flocculant with the fossilized alga dissolving bacteria and algal toxin degrading bacteria so as to prepare the compound microbial algaecide. The compound microbial algaecide is good in alga killing effect and algal toxin degrading effect; source materials adopted during the preparation of the compound microbial algaecide are low in cost, so that the compound microbial algaecide is low in preparation cost and harmless to natural ecosystems. The prepared compound microbial algaecide is organically integrated with functions of flocculation-type alga removing, microbial alga dissolving and micro-biological degradation of algal toxin, so that the safe and efficient treatment of water blooms is realized.

The invention provides a control method for issuing information according to exclusive indication information in information issuing system. The method comprises steps: acquiring a first content indication information; analyzing the indication information to determine if the first content includes the exclusive indication information; providing the second content to user terminal. The invention also provides an information issuing system for issuing information according to exclusive indication information comprising a first acquiring device, a first determination device and a first processing device. The invention also provides a first assistant control device for issuing information for user terminal according to exclusive indication information, and related assistant control method, and a second assistant control device for issuing information for the first content server according to exclusive indication information, and related assistant control method. The invention can effectively avoid advertisement information to occur at sensitive page or page unexpected, which can not exert negative influence on advertisement owner and effectively promote advertising effect.

An on-line monitoring device for lightning current of an overhead transmission line is composed of an Msp430 single chip microcomputer, an FPGA, a trigger circuit, an AD collection and matching circuit, an AD converter, a GPS module, a GPRS communication module, a solar panel, a charge controller, a storage battery, Rogowski coils, a digit circuit power supply and an analog circuit power supply, is installed at a cross arm of a pole tower, and is powered by solar batteries, and sensors are installed on an insulator chain of the pole tower of the power transmission line and a lightning conductor of the pole tower. When a placed near a monitored point is struck by lightning, the Rogowski coils output induction voltage. When the voltage reaches a certain threshold value, the trigger circuit of the device starts to collect lightning current signals, and sends a measurement result to a terminal computer through a wireless communication method. A lightning current oscillogram and waveform parameters of each path are obtained through comprehensive analysis of the terminal computer, and the pole tower is guided to carry out maintenance work.

An anti-pollution self-cleaning poly(vinylidene fluoride) flat-sheet ultrafiltration membrane and a preparing method thereof are disclosed. The method includes dispersing a certain amount of attapulgite-graphite-like phased carbon nitride composite material particles in triethyl phosphate that is adopted as a solvent; adding poly(vinylidene fluoride) and an amphiphilic copolymer into the obtained dispersion; violently and mechanically stirring the mixture until added materials are dissolved; then adding a pore-forming agent that is poly(ethylene glycol); fully stirring the mixture; finally allowing the mixture to stand and defoaming the mixture to obtain a film casting liquid; and performing immerged phase-inversion to obtain the flat-sheet ultrafiltration membrane by adopting an aqueous suspension of an attapulgite-graphite-like phased carbon nitride composite material as a coagulating bath. A three-dimensional network structure formed by a unique nanometer fiber structure of attapulgite and poly(vinylidene fluoride) is utilized to effectively improve the structure and strength of a pure poly(vinylidene fluoride) ultrafiltration membrane and to enhance a membrane densification property. More importantly, photocatalytic performance of graphite-like phased carbon nitride on the surface and in the main body of the ultrafiltration membrane is utilized to achieve anti-pollution and self-cleaning functions of the membrane and to increase the economical efficiency of a membrane separating process.

According to the invention, the high-speed moving bearing (1) is embodied as an automatically-compensating movable ball bearing with several adjacent races of balls (6, 7, 8, 9, 10) with operation-dependent radial thermal expansion of the bearing rings (2, 3), the bearing rings (2, 3) of which are only in supporting contact with one ball race (8) in the cold state for the high-speed movable bearing (1), by means of a convex embodiment of the running surfaces (5) for the roller bodies (4) on the inner bearing ring (2). With increasing thermal expansion and expansion due to centrifugal force of both bearing rings (2, 3), the further ball races (6, 7, 9, 10) come sequentially into such a contact position with both bearing rings (2, 3) as a result of an elastic radially-flexible embodiment of both bearing rings (2, 3), that the bearing rings (2, 3) at the operating temperature for the high-speed moving bearing (1) are in supporting contact with all ball races (6, 7, 8, 9, 10).

The invention discloses a preparation method of a cobalt-free power battery positive electrode material. The method comprises the following steps of (1) mixing nickel-manganese hydroxide and a lithiumsource, adding a dopant and a dispersing agent, carrying out ball milling, and stirring to obtain a muddy substance A; (2) adding the muddy matter A into a mold for pre-pressing to obtain the mixed powder; (3) pressing the mixed powder to obtain a pressed blank, sintering, cooling, and applying a pulsed magnetic field to obtain a blank; (4) carrying out crushing, magnetization and magnetic separation on the blank to obtain the non-magnetic particles, adding a coating material and a dispersing agent, and carrying out ball milling and stirring to obtain a muddy material B; and (5) carrying outstatic pressure sintering on the muddy substance B, crushing and screening to obtain the cobalt-free power battery positive electrode material. When the doped material is pressed and sintered with high energy, the density of a finished product is high by utilizing the high instantaneous impact force; and by adopting the static pressure sintering coating type material, the material has very high density, and under the synergistic effect of the two materials, the overall density of the material is improved.

The invention relates to the field of communication and internet, in particular to a configuration management system and method. According to the system and the method, after updated configuration information is set by a CMCS (configuration management center system), the CMCS is started and the configuration information is incrementally registered to a registry by a configmanager, a CMCS client and the registry automatically and asynchronously push updated configuration information meeting screening principles to the CMCS client and unload the information to a configuration file according to established subscription relations and preset screening principles, and an APP function unit reads updated data in the configuration file to finish updating operation of the APP; besides, when the CMCS service is halted, the APP can still work according to the configuration information stored in the configuration file, that is, according to the improved system and method, the system management is automatic, the updating timeliness is high, the operation is simple, and the client is still available when the configuration service is halted.

The invention relates to a fire pre-processing method for a low-grade lateritic nickel ore which belongs to the field of nonferrous metal. The method includes following steps : the low-tenor lateritic nickel ore mine is cracked; vulcanization pre-processing is carried out; a metal sulfide is generated; the ore concentrate and the tailing of the nickel purite can be obtained through carrying out one time roughing, four time choiceness and three time scavenging on the preprocessed lateritic nickel ore and returning the middling ores in sequence; under a magnetic field intensity of 6000 to 10000 oersted, one time open roughing and three time open choiceness are carried out on the flotation tailing; a magnetic product is iron ore concentrate; the rest products are combined into the total tailing. The technology of the invention has the characteristics of high material suitability, short flow, good vulcanization effect, device investment saving, low production cost, and the like, thus leading the subsequence beneficiation techniques to be greatly simplified and being capable of producing the mixed ore concentrate of nickel and cobalt, the iron ore concentrate and the tailing as well as obtaining a higher metal ore concentrate grade and a high recycling rate.

The invention belongs to the field of inorganic salt chemical industry and fertilizer production, particularly relates to a method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as an intermediate. The method comprises the following steps of: with anhydrous magnesium chloride or bittern magnesium chloride as a raw material and with ammonia and ammonium bicarbonate as precipitating agents, obtaining the magnesium carbonate hydrate intermediate (the purity reaches 97-99 percent) with favorable crystal form by controlling process conditions; calcining the obtained magnesium carbonate hydrate intermediate to prepare magnesium oxide (the purity reaches 95-99 percent); adding salt to mother liquor enriched with ammonium salts and evaporating, salting out and cooling to separate out ammonium chloride, and filtering to obtain the ammonium chloride, wherein the mother liquor is circularly taken as a raw material. The method aims at producing needle-shaped or spherical magnesium carbonate hydrate by utilizing rich magnesium chloride brine from salt lakes, or magnesium chloride brine from seawater, or anhydrous magnesium chloride used for producing titanium sponge by-products, and other magnesium salt materials, thereby preparing high-purity magnesium oxide with the simultaneous co-production of ammonium chloride fertilizer. The method of the invention has strong maneuverability and is easy to realize industrialization.

The invention discloses a metal ceramic CT bulb tube. A metal casing surface of the CT bulb tube is coated with a Fe3O4 coating, and the thickness of the coating is controlled in a range of 0.01-0.08mm. The invention further discloses a technology of the metal ceramic CT bulb tube. The technology comprises steps as follows: 1), the coated metal casing matrix surface is subjected to sand blastingtreatment in advance; 2), the metal casing matrix surface is coated with the Fe3O4 coating with a plasma spraying technology, thermal radiation coefficient of a metal casing can be increased, and thermal radiation absorption capability of the metal casing is improved.

The invention discloses a composite phosphorus removing agent and a use method thereof, wherein the composite phosphorus removing agent is used for treating municipal sewage with high total phosphorusconcentration, the total phosphorus concentration is 5-10 mg / L, and the composite phosphorus removing agent comprises the following raw materials by weight: 75-100 parts of a component A, 4.2-9.5 parts of a component B, and 3-10 parts of a component C, the component A is 15-30 parts of an aluminum salt and 60-70 parts of an iron salt, the component B is a basic flocculant and a granular flocculant, the component C is a carbon source supplementing agent, the basic flocculant is 2-3 parts of polyferric sulfate, and the granular flocculant is 2-3 parts of sodium silicate and 0.2-0.5 part of polyacrylamide. According to the present invention, the used raw materials of the phosphorus removing agent are the common water treatment agents, and are compounded, such that the phosphorus removal rateis fast, and the phosphorus removal rate can reach more than 95%, or even 100%; the process is simple, and the production cost is low; and compared with other phosphorus removing agents, the phosphorus removing agent of the present invention has the following characteristics that the whole phosphorus removing process is more than twice as fast as the similar products while microorganisms are notadversely affected.

The invention discloses a composite adsorption material for removing manganese ions from natural water and a preparation method for the adsorption material. By using complexation reaction of humic acid and manganese and the principle that a modified volcanic rock filter material can well adsorb the manganese, the modified volcanic rock filter material and the humic acid are combined to form a composite material for efficiently treating the manganese ions in the water. The invention also relates to a specific application method of the prepared material. The material is simple, the requirement on equipment is low, and the operation period is short, so that the method is obviously superior to the traditional oxidation method in the aspects of operation and investment; and in addition, the material can completely adsorb the manganese ions, which is the highlight of the material.

The invention provides a high-temperature lubricating agent for metal thermoplastic processing. The high-temperature lubricating agent comprises the components of 15-70% of alkali metal salt, 10-50% of phosphate, 0.5-30% of boric acid and 0.01-2% of bactericide, wherein 1-20 fold of water is added to the components to prepare into colorless transparent solution. The prepared lubricating agent is coated on tools and molds of which the temperature is greater than 80 DEG C. The high-temperature lubricating agent has stable viscosity, and small shear force at high temperature, has good high-temperature lubricating property and good heat-insulting property, and can be subjected to liquid lubrication; rapid rise of temperature of a core rod is avoided in the process of continuously rolling a steel pipe; and improvement of the service life of the core rod is facilitated. The high-temperature lubricating agent is suitable for the processes of rolling, forging, extruding and like of the steel under a high-temperature state, and especially suitable for lubricating the core rod when a seamless tube is hot rolled. The high-temperature lubricating agent does not cause any pollution to the environment. Therefore, the high-temperature lubricating agent has good popularization and application prospect.

The invention relates to a coking additive and the application thereof, belonging to the coal processing field. The technical problem to be solved is to improve the coke quality and in particular to lower the thermal reaction of the coke. The coking additive is SiO2 powder which can pass through a sieve 100. The best purity of the additive is larger than 99 percent. SiO2 is creatively applied to the improvement of the performance of the coke by the invention. The reaction of the obtain coke can be lowered by 2-6 percent points. At the same time, with low cost, the coke additive of the invention brings no secondary pollutions. Residuals in the coke bring no negative effects on the blast furnace smelting. And the coking additive is especially applied to the industrialized production.

The invention discloses a method of suppressing light-and elevated temperature-induced degradation for a multicrystalline silicon PERC (Passivated Emitterand Rear Cell). The adopted cell slice structure comprises a front electrode, a silicon nitride antireflection layer, a passivation layer, a phosphorus diffusion layer, p-type polysilicon, an alumina passivation layer, a silicon nitride protective layer and a back electrode, and the cell slice is put in an ordinary annealing furnace without light and air atmosphere, the temperature of the annealing furnace is set to be 180 to 200 DEG C, and the annealing time is 3 hours. The no-light low-temperature annealing technology has the advantages that the cost is low, the process is simple, no negative influences are generated on the cell performance, and thus has wide popularization and application value in the multicrystalline silicon PERC industry.

The invention discloses a method for performing resource utilization of sludge biocarbon. The method comprises the following steps: uniformly mixing the sludge biocarbon, water and auxiliaries and performing granulation to obtain granulated materials; mixing the granulated materials with original sintering base ingredients to obtain a sintering mixed material; performing sintering on a conventional metallurgical sintering machine to obtain sintered ores; feeding the sintered ores as iron-making raw materials into a high blast smelting. According to the method disclosed by the invention, valuable components in the sludge biocarbon can be effectively utilized, the components and the performance of the sintered ores are adjusted, and the cost of the sintering raw materials is reduced; and 3 percent to 8 percent of carbon contained in the biocarbon can be used as supplementary energy sources for sintering, so that the cost of fuels is reduced. According to the method, a new path is provided for scale utilization of sludge pyrolysis terminal products, the sludge biocarbon is used as the raw material for high blast smelting, so that accumulated pollution of heavy metal which potentiallyexists in the land utilization process is completely avoided, and the method is particularly suitable for performing resource utilization of sludge pyrolysis which contains superstandard content of heavy metal. The method disclosed by the invention has the advantages of simpleness, practicability, less investment, low cost and environmental protection.

The invention relates to a wheat straw fiber-reinforced gangue geopolymer material and a preparation method thereof. The geopolymer material comprises a powder material, wheat straw fibers and a liquid sodium water glass excitant. The preparation method comprises the following steps: by taking ground low calcined gangue micropowder as a primary raw material, doping a proper amount of granulated blast-furnace slag micropowder and slaked lime as an active calcium supplementing agent in an auxiliary agent; and doping the wheat straw fibers as an anti-crack reinforcing material and preparing the gangue geopolymer material which is high in strength and excellent in anti-crack performance with water glass as an excitant. The gangue is crushed and calcined, then the material is weighed, proportioned and mixed, and the wheat straw fiber-reinforced gangue geopolymer material is prepared. The material can replace cement and is applied to manufacturing of a concrete mixture, so that fast consumption of a limestone raw material in cement manufacturing can be alleviated, wastes are turned into wealth, various environmental pollution problems caused by accumulation of the gangue and incineration of the wheat straws are eliminated gradually, the utilization ratio of the waste gangue and the wheat straws is increased, the environment is protected, and thus the material is an energy-saving and environment-friendly building material.

The present invention provides a split-gate power DMOS device, belonging to the technical field of semiconductor power devices. The split-gate power DMOS device is improved based on a traditional split-gate power DMOS device, a top layer of a drift region between trench gate structures at two sides of the device has a body region, the top layer of the body region has source regions and contact regions which are in alternating arrangement, the alternating arrangement direction of the resource regions and the contact regions is reasonably arranged and a heavily-doped current guidance layer is introduced between side walls of the contact regions and a trench to form a current channel with low on resistance and allow the source regions to be in direct contact with a dielectric layer at the side wall of the trench. According to the invention, an avalanche breakdown current is fixed in the current guidance layer and is guided to directly flow away from the contact regions via the current guidance layer without passing through the body region below the source region so as to avoid starting of a parasitic BJT (Bipolar Junction Transistor) and improve the UIS (Unclamped Inductive Switching)tolerance and UIS resistance failure capacity of the device. Besides, the lateral effect of depletion of a split-gate electrode can avoid negative influence of the current guidance layer on the device pressure-resistant property.