308results about How to "Solution area" patented technology

The invention discloses a five-cylinder plunger pump with an integral power end structure. According to the five-cylinder plunger pump, an integral welding structure is adopted for a crankshaft box body and a crosshead box body in a five-cylinder plunger pump power end assembly, so that the structural strength of the power end assembly is higher, the supporting stability is better, and the whole pump vibration can be reduced; the cylinder spacing is 13-14 inches, the bearing area of connecting rods, crossheads and bearing bushes is increased, a guarantee is provided for the output of the high-power of the five-cylinder plunger pump, the high-power five-cylinder plunger pump can effectively solve the problem that the shale gas fracturing well site area is narrow and the required fracturingequipment is relatively large, the use of equipment can be reduced, and the wellsite arrangement is facilitated; the 11-inches long-stroke design can better realize large-displacement operation requirements and improve the operation efficiency; and according to the multi-point supporting design of crankcase bodies, crosshead box bodies and the hydraulic end assembly, the supporting strength of thefive-cylinder plunger pump can be improved, the vibration is reduced, the high-load operation is better guaranteed, and the operation is more stable.

The invention discloses a secondary aluminium cell and a preparation method thereof. Foamed aluminium serves as a cathode. A carbon and sulfur composite material or sulfurized polyacrylonitrile serves as an anode active material. A halogen aluminate ionic liquid formed from halogen aluminium acid and any one of halogenated quaternary ammonium salt, quaternary alkylphosphonium salt or quaternary sulfosalt is obtained by preparing electrolyte. The cell has the advantages of high energy density, good cycle performance, safety, environmental protection, no pollution in the preparation process, low cost and simple process.

The invention discloses a double-rotation SCR denitration method and an apparatus thereof. According to the invention, a first eddy flow catalytic reaction chamber and a second eddy flow catalytic reaction chamber are arranged along a denitrating tower body; a flue gas introduction pipeline is arranged on a sidewall of the denitrating tower body; several eddy flow atomizing nozzles are respectively arranged on inner periphery of the flue gas introduction pipeline and the inner periphery at top of the first eddy flow catalytic reaction chamber; when flue gas is introduced into the flue gas introduction pipeline, the flue gas and ammonia gas injected by the eddy flow atomizing nozzle are mixed, and a mixture enables spiral sinking along circumference of the first eddy flow catalytic reaction chamber from up to down in a tangent circle mode, under effect of a cyclone, and then the mixture enable spiral rise along circumference of the second eddy flow catalytic reaction chamber from down to up in the tangent circle mode. Under prerequisite that high efficiency denitration is ensured, catalyst amount is less, operation of technical means is simple and easy, compared with the prior art, a denitrating tower structure is simple, cost of the apparatus is low, denitration efficiency is high, energy consumption is low, escapement ratio of ammonia is reduced, denitration cost is greatly reduced, and economic benefit is obviously increased.

The invention belongs to the technical field of aerogel materials, and particularly relates to a preparation method for a crosslinking type polyimide aerogel. The adopted sol-gel method comprises the steps that acid anhydride and diamine containing a plurality of benzene ring structures are adopted as a precursor body to prepare polyamide acid, then a crosslinking agent is added to form a crosslinking type polyamide acid structure, imidization is performed to form wet gel, and the supercritical drying technology is combined with the wet gel to obtain the crosslinking type polyimide aerogel material with the low mass, high specific surface area and good heat stability. Compared with the prior art, the preparation method has the advantages that raw materials are easy to obtain, the reaction process is simple, the obtained material is of the nanometer level three-dimensional net structure, the density of the material is smaller than 130 mg/cm<3>, the specific surface area can reach more than 500 mg/cm<3>, and the problems that conventional organic aerogel is high in density, low in specific area, poor in heat stability and the like are solved.

The invention relates to the field of semiconductor materials and aims at providing a preparation method of a TiO2/porous g-C3N4 composite material. The preparation method of the TiO2/porous g-C3N4 composite material comprises the following steps: dropwise adding H2SO4 aqueous solution into melamine aqueous solution to form a white suspension solution; stirring at the temperature of 80 DEG C for 2 hours to obtain sediment; filtering the sediment and respectively washing the sediment for three times by using distilled water and absolute ethyl alcohol, drying the washed sediment at the temperature of 60 DEG C for 24 hours to obtain melamine sulphate; adding the melamine sulphate into a corundum boat, subsequently sintering the melamine sulphate in a tubular furnace, cooling the melamine sulphate to room temperature and grinding an obtained yellow polymerization product into powder particles to obtain g-C3N4 particles. The preparation method of the TiO2/porous g-C3N4 composite material has the beneficial effects that the g-C3N4 polymerization temperature is effectively reduced; by virtue of the protonation of the melamine, the polymerization energy of melamine is reduced; the melamine can polymerize at relatively low temperature to generate graphite-like g-C3N4.

The invention provides a sugarcane tissue-culture-seedling bare-seedling field-transplanting method which comprises the following steps: culturing sugarcane tissue culture seedlings in a sound seedling culture medium for 1-2 generations; carrying out the rooting culture; group-planting in a seedling breeding garden to breed the seedlings for 30-40 days; after each sugarcane seedling has the independent root system, hardening the group-planted seedlings, dividing the seedlings, and directly transplanting each bare individual seedling to a prepared seedling breeding field; and after planting, carrying out the management for enhancing the survival percent, and the like. Compared with the conventional tissue culture seedling breeding transplanting method, the method of the invention reduces the step of tissue-culture-seedling nutritive cup temporary planting, can effectively solve the problems of long nursery breeding time before sugarcane tissue culture seedling is planted to the field, large occupation area in the nursery, high production cost and the like, and has the advantages of easy seedling lifting, convenient transportation and transportation cost saving. The invention prolongs the field growth time and enhances the per unit yield by about 25%.

The invention relates to a method for preparing an ecological organic fertilizer from organic waste. The method comprises the following steps of putting the organic waste of which the moisture content is within 95% into a subcritical water reaction kettle, adding biomass which is 0-10% of the organic waste, feeding NaOH to the reaction kettle to adjust the pH to 7.5-8.5; leading steam into the reaction kettle, adjusting the temperature to 150-300 DEG C and the pressure to 0.5-5.0MPa to react for 15-60 minutes; baking or dewatering the product until the moisture content is 50-65%; feeding a microbial agent which is 0.5-1% of weight of the product to the baked or dewatered product; evenly mixing and then piling, heating the pile to 60-70 DEG C after 2-3 days to be stable, and carrying out heat preservation at 55-65 DEG C to maintain for 5-7 days, and turning when the temperature exceeds 65 DEG C and preparing the product until the temperature is not changed. By adopting the method, the limitation of the traditional aerobic fermentation is broken through; pathogene can be thoroughly killed; no bad smell or heavy metal pollution appears; the treatment cost is reduced; the treatment efficiency is improved; and the highest target of resource utilization of the organic waste is achieved.

A method for controlling the rock desert zone by use of bryophyte and dendrobe includes such steps as collecting wild bryophyte, stretching to decrease its thickness to 1-2 mm, dividing it into squares (1-100 sq.mm), reproducing in hothouse for 1-2 months, culturing the dendrobe seedlings in hothouse, stretching the reproduced bryophyte to decrease its thickness to 1-2 mm, dividing it into squares (1-100 sq.mm), transplanting the bryophyte on the surface of bare rock, and transplanting the dendrobe seedlings in said bryophyte layer.

The invention provides a fatigue and vibration experiment table and a fatigue and vibration experiment system. The fatigue and vibration experiment table comprises two fatigue and vibration experiment modules, a longitudinal platform, a longitudinal loading framework and a longitudinal loading device, wherein each fatigue and vibration experiment module comprises two vibration units, a fatigue unit and a bearing platform; the two vibration units are arranged on the bearing platform in a sliding way; the fatigue unit is fixedly arranged on the bearing platform and is positioned between the two vibration units; and the bearing platform is arranged on the longitudinal platform in a sliding mode and slides in a frame body of the longitudinal loading framework. The technical scheme of the invention solves problem that separate fatigue experiment table and vibration experiment table are used to complete fatigue experiments and vibration experiments in the prior art, so the two experiment tables have high building and investment cost and large occupied area, fulfills the aim of integrating the fatigue experiment table and the vibration experiment table, and has the characteristics of low building and investment cost and small occupied area.

The invention discloses a rechargeable aluminum-sulfur battery and a preparation method thereof. The rechargeable aluminum-sulfur battery is prepared by adopting metallic aluminum or aluminum alloy, preferably foamed aluminum as cathode, polymeric organosulfides as anode active substances, and halogenated aluminic acid ionic liquid formed by halogenated aluminum with any one of quaternary ammonium salt, quaternary phosphor salt or quaternary sulfosalt as electrolyte. The rechargeable aluminum-sulfur battery has high energy density, good circulation performance, safety and environmental protection, no pollution in preparation process, low cost and simple technique, thus having good application prospect.

The present invention discloses a phosphate or metaphosphate based visible-ultraviolet up-conversion luminescence material doped with rare earth ions, wherein phosphate or metaphosphate serves as a substrate, and the substrate material is doped with Pr<3+>; a molar ratio of phosphate or metaphosphate to Pr<3+> is (0.9-3):(0.01-0.1). The present invention further provides a preparation process of the material, comprising: (a) according to the chemical formula, weighing oxide materials of corresponding elements and ammonium dihydrogen phosphate according to a stoichiometric ratio; and (b) grinding the weighed materials, burning the ground materials at the temperature of 850 to 950 DEG C for 2.5-4 h, cooling the materials to the room temperature, and grinding the materials to obtain a powder-like up-conversion luminescence material. It is experimentally proved that when excited by a common light source (such as an incandescent lamp, an xenon lamp, a fluorescent lamp and an LED lamp), especially by sunlight, the material can emit ultraviolet light UVC that can effectively kill bacteria; and the material has a broad application prospect in the fields of food safety and environmental protection.

The invention discloses a rainwater collecting and recycling system for an urban green land and a plaza; the rainwater collecting and recycling system comprises the green land, roads around the green land and the plaza; the green land is of a sunken structure which is lower than the roads and the plaza; the plaza is of a dome structure which is slightly lower at four sides; and the roads are of arched structures which are higher at the middle and slightly lower at two sides; rainwater on the roads and the plaza enters a water collecting well which is connected with a covered filtering channel; the water drain end of the covered filtering channel is connected with an underground impounding reservoir; a concrete cover plate layer is arranged at the upper part of the impounding reservoir; the green land is arranged at the upper part of the concrete cover plate layer; a water pump is arranged in the underground impounding reservoir; and the water outlet of the water pump is connected with a green land irrigation spray head. The rainwater collecting and recycling system for the urban green land and the plaza relieves the pressures on sewage disposal, municipal water supplying and shortage of urban water sources, realizes rainwater recovery and gives full play to the ideas of energy conservation, emission reduction and sustainable development.

A preparation method of an yttria-stabilized zirconia tetragonal nano powder with high specific surface area. The method is characterized by comprising the following steps: (1) respectively weighing zirconium oxychloride octahydrate?and an yttrium raw material according to a stoichiometric ratio of zirconium and yttrium in (Y2O3)x(ZrO2) 1-2x (0.005<=x<=0.150), according to the amount of a target product, converting the yttrium raw material into an yttrium nitrate solution by dissolving, and then completely dissolving the zirconium oxychloride octahydrate; (2) respectively adding a soluble salt and organic fuel to the solution obtained in the step (1), heating for dissolving, continuing heating and concentrating to a sticky state, igniting in a heating furnace chamber at 400-1000 DEG C, and taking out the powder after complete combustion; and (3) washing, filtering and drying the powder obtained in the step (2). The invention effectively solves the problems of serious particle sintering agglomeration and small specific area in the process of solution combustion for synthesis of zirconium oxide; the powder has specific surface area as high as 378 m<2> / g and particle size about 2.8 nm; and the materials are more accessible and cheaper, so as to facilitate industrialized preparation.

This invention relates to a low-temperature method for preparing TiO2 nanopowder. The method comprises: utilizing tetrabutyl titanate as the precursor, dropping into ice water solution containing acid to prepare TiO2 hydrosol, drying at room temperature, and drying at 120-180 deg.C to obtain anatase-type TiO2 nanopowder. This invention utilizes low temperature method, and only adopts aqueous solution of diluted acid as the sovent, thus avoiding alcohol or other stabilizers. The method has such advantages as simple process, low energy consumption and little pollution. The obtained TiO2 nanopowder has large specific surface area and high photocatalytic activity. By rational combination of carrier and UV source, the TiO2 nanopowder can effectively remove organic pollutants.

The invention discloses a skid-mounted supercharging and hydrogenation unit which comprises a frame and further comprises an instrument air system, an air unloading pipe, supercharging equipment, a closed type cooling water system, refilling equipment, a control system and ventilation equipment which are integrated to the frame. According to the skid-mounted supercharging and hydrogenation unit, the other structures except for a storage device are all integrated to the frame, and therefore the skid-mounted supercharging and hydrogenation unit at least has the beneficial effects that all equipment of a hydrogen refueling station can be highly integrated, and the problems that transportation is difficult, the occupied area is large, and the station building period is long are solved; and highly integration of functions and control of the skid-mounted hydrogen refueling station meets the market diversification requirement, and market promotion of hydrogen energy equipment is facilitated.

The invention provides a multilayer wiring substrate/multi-chip integration-based large port interconnection chip interconnection construction and physical realization method and relates to a multi-chip interconnection structure, a multi-chip interconnection structure construction method, multi-chip layout, substrate pin array partitioning and distribution, distribution of high-speed differential signal pin pairs, effective partition of substrate wiring and a partition method of the substrate wiring as well as a corresponding multi-chip interconnection chip device which are applicable to substrate integration. According to the invention, large-port interconnection chips can be effectively and equivalently realized based on substrate encapsulation size. Compared with a corresponding single-chip integration implementation method, the method of the invention can support multiple kinds of interconnection structures, and is compatible with interconnection sub-chips be of a variety of micro-system structures, can effectively utilize the characteristics of different functional interconnection sub-chips, and has better performance in implementation cost of the chips, scalability, flexibility, compatibility and the like; and at the same time, the method of the invention has lower requirements for manufacturing technology for realizing a required integrated circuit and can provide interconnection chips having different specifications and different number of ports, and can more flexibly adapt to market demands.

The invention discloses a method for synergetic extraction of coal bed gas in a caving type gob area and a lower coal bed. The method comprises the steps that firstly, a mine is explored, a horizontal well is constructed from the ground to a base plate of the gob area, carbon dioxide is compressed into the well for cleaning, and coal bed gas extraction is carried out; when the extraction amount of coal bed gas in unit time drops to 20%-40% of Qi, running and stopping circulate, the extraction pressure is reduced, and the re-extraction process is carried out again; when the extraction amount drops to be below 20% of Qi, carbon dioxide is injected for replacement, and extraction is carried out again; when the extraction amount drops to be below 20% of Q1 again, the horizontal well and a coal and rock strata of the lower coal bed are subjected to fracture, and coal bed gas discharge and extraction are carried out; when the extraction amount drops to be below 20% of Q2, supercritical carbon dioxide replacement is carried out; and when the extraction amount drops to 10% of Q2 through extraction, extraction is stopped. By means of the method, synergetic extraction of coal bed gas in the carving type gob area and coal bed gas near a low coal seam is achieved, cost is reduced, and the coal bed gas resource is extracted to the greatest extent.

The invention discloses a BIM-based construction site griddization management system and a control method thereof. The management system comprises a central processing device, a user terminal and a verification terminal. The control method comprises that: the central processing device establishes a virtual model of a construction site; the central processing device carries out grid partition of the virtual model to form construction units; dispatch lists are formed in accordance with a construction plan and are sent to the user terminal; construction teams enter into the construction units via the verification terminal by virtue of the dispatch lists and feed back construction information; and the central processing device updates the virtual model according to the construction information and adjusts the dispatch lists. The invention achieves satisfactory effects in aspects of progress control, construction quality, safe and civilized construction and the like, solves the problems of conflicts between time and space during construction and the problems of large-scale idleness and reworking that might follow, and helps construction enterprises to gain tangible economic and social benefit in the construction management process.

Disclosed is an efficient cleaning device. The efficient cleaning device comprises a cleaning pool, a material cleaning groove, a circulating water treating pool, a connecting pipeline and the like. Gas can be fed into the material cleaning groove to conduct bubble-type washing on materials. Enough purified water is added into the material cleaning groove to spray and flush the materials. The water and sewage penetrate through the material cleaning groove and then are sucked by a water intake formed nearby. Water of the water intake flows into the circulating water treating pool through the pipeline or a water pump and the pipeline. Impurities or sludge or high-concentration sewage can be filtered or discharged from a sewage discharging valve. The purified water obtained after being treated can flow back through the pipeline or be conveyed back to the cleaning pool or the material cleaning groove by the water pump and the pipeline to form recycling of the water. Meanwhile, the materials can be washed under the environment with cleaner water. The circulating water treating pool is independent of the cleaning pool and is provided with a filtering device, a fine filtering layer and the like, water treatment like sediment or filtering or medicine adding or ozone disinfection or sterilization and disinfection can be carried out on the water. The efficient cleaning device is suitable for fixation of materials like fruits and vegetables or continuous cleaning.

The invention provides a high-fastness natural dye printed product and a preparation method of the high-fastness natural dye printed product. The method comprises the following steps: performing pre-treatment and cationic modification on a fabric; preparing a cation removing printing work liquid, performing cation removing printing on the fabric after the cationic modification, and baking or steaming; and dyeing the fabric after the cation removing printing by using a natural dye so as to obtain the high-fastness natural dye printed product. The preparation method disclosed by the invention can be used for solving the problems that heavy metal in a natural dye printed product is out of standard, the hand feeling is slightly hard, the color fastness is poor, the large-area bottom color is not uniform, and the like.

In a soil cold-storage and soil coupling heat pump integrated system, between the condenser and the cooling tower of the refrigeration plant, between the condenser and the underground built-in pipe heat exchanger, between the condenser and the users the pipeline is connected to the circuit, between the evaporator and the users, between the evaporator and the underground built-in pipe heat exchanger the pipeline is connected to the circuit, between the underground built-in pipe heat exchanger and the users the pipeline is connected to the circuit.

The invention discloses a hibiscus esculentus brewed wine and a brewing method thereof, and relates to a wine preparation technology. The method mainly comprises the following steps: 1) picking and cleaning; 2) homogenizing; 3) performing enzymolysis; 4) sugaring; 5) compounding juice; 6) homogenizing and deaerating; 7) sterilizing; 8) inoculating and fermenting; 9) filtering, removing impurities and sterilizing; and the like. The brewed wine is prepared by respectively homogenizing hibiscus esculentus flowers and hibiscus esculentus fruits and then mixing and fermenting, and the fermentation method is that activated apergillus oryzae and rhizopus oligosporus compound strain is inoculated firstly to carry out culture fermentation, and then activated Angel yeast is inoculated to carry out fermentation. The hibiscus esculentus brewed wine prepared by the invention is rich in nutrition, unique in flavor, soft in taste and good in health care effect.

The invention relates to a new energy device, in particular to a new energy municipal road sweeping device which includes a box body, a lifting box, a sweeping device, a garbage collecting box, a spray box and wheels. The problems that the increase of populations and vehicles intensify the pollution of urban roads, a large number of garbage and silt are generated, existing road cleaning is mostlydepends on manual work, the manual sweeping area is small, and the progress is slow can be solved. The problems that an existing road cleaning device is simple in structure and single in function andonly separate sweeping can be performed, the road surface garbage cannot be collected and cleaned, an existing road sweeping device power source is mainly petrol or diesel, resources are wasted, and the petrol and the diesel generate waste gas during combustion, which pollutes the environment and intensifies the greenhouse effect are solved.

The invention discloses a continuous production method for foam concrete and belongs to the technical field of building materials. The method is characterized in that concrete, coal ash and ore powder are dispersed in advance and the workability is compactly enhanced before raw materials are mixed and stirred in the production process. Furthermore, a tunnel kiln or box type structure is used for performing damp-heat curing and electromagnetic wave dehydration processes, instead of an original natural curing process, on a de-molded foam concrete blank, so as to quickly and continuously produce the foam concrete heat-insulating building material. The method has the advantages that the problems of a present method of manual workshops for producing the foam concrete, such as unstable quality, low production efficiency, big floor area of a production workshop, incapability of realizing standardized production, poor working condition, large investment of project construction and high cost of products are solved by the continuous production method for foam concrete, the continuous production method for foam concrete is importantly promoted and improved, the continuous and modernized production is realized, and the continuous production method for foam concrete is worthy of application and popularization.

The invention relates to a dedicated filler for a constructed wetland and a preparation method for the filler and belongs to sewage reclamation and reuse treatment method in environmental engineering. The dedicated filler for the constructed wetland adopts a cuboid structure and is prepared by mixing different proportions of residual sludge in a sewage plant with clay, dioscorea villosa or reed sections respectively as required and then treating, forming and sintering the raw materials. The die size and the open hole size and direction of the filter are determined according to the purposes of the filter; the holes are cuboidal or cylindrical; and the holes are vertical to the big surface. The invention has the advantages that a sludge hollow brick has the characteristics of high strength, low cost, long life and good effect of adsorbing pollutants; the engineering construction and the operating maintenance at the later stage of the filler for the constructed wetland are facilitated; the service life of the filler for the constructed wetland is prolonged; and the effect of removing phosphorus from the sewage is enhanced. The residual sludge of the sewage plant is subjected to resource utilization and serves as the raw materials, so the problem of treatment on the residual sludge of the sewage plant is solved and the influence of the residual sludge on the environment is reduced.

The invention belongs to a recovering and utilizing method for a solid waste acid-leaching lead slime on a polar plate of a storage battery and a system. According to the method, an obtained lead-bearing suspension acid liquid is collected and lead powder in the lead-bearing suspension acid liquid is immediately separated from an acid leaching liquid through a pressure filtration method. The recovered lead powder is collected, dried, crushed and decontaminated and then is recycled according to the components and the amount of the lead powder. The system comprises a weighing control adder, a vacuum paste mixing machine, a plate coating machine and a crushing and decontaminating machine. The lead-bearing suspension acid liquid can be automatically separated and recycled immediately, so that the problems that the lead-bearing suspension acid liquid pollutes the environment, and is high in recovery cost and large in floor area can be effectively solved, and the system has the advantages of being reasonable in method, simple in structure, low in recovery cost, high in resource recovery utilization ratio and good in energy-saving and environment-friendly effects.

The invention discloses a construction method of a crack-resisting cement stabilized crushed stone base course. The problems that at present, contraction fissures of a traditional cement stabilized crushed stone are many, the surface is prone to loosening after freeze-thaw, the defects of the construction mode exist in the construction side, and therefore large-area cracks and freeze-thaw are generated in the subsequent process of the road surface are solved. According to the key points of the technical scheme, the construction method comprises the following steps that (a), the crack-resisting cement stabilized crushed stone base course comprises a collected material, 3%-5% of cement and water, the curve of the screen hole size of the collected material and the passing percentage is in an S shape; (b), a mixture is mixed; (c), the mixture is conveyed; (d), the mixture is paved, specifically, square timber cushion blocks are put under a paver screed plate in advance, and mixture paving adopts two pavers to synchronously operate in an echelon formation mode; (e), the mixture is grinded; and (f), curing is conducted, specifically, a curing film or geotechnical cloth is covered to conduct hydrating curing, so that the surface of the cement stabilized course keeps a moist state all the time, and the cement stabilized crushed stone base course with the crack-resisting property being obviously improved is obtained.

Provided is an anchor hole based slope afforesting method. The method comprises the following steps that firstly, reconstructing is carried out on an anchor hole; secondly, an inner space of a water and fertilizer storing cavity is divided into a water storing area and a fertilizer storing area; thirdly, a prefabricated PVC pipe is embedded into the hole opening portion of the water and fertilizer storing cavity; fourthly, parthenocissus tricuspidata and kudzu seeds are planted into the prefabricated PVC pipe, and slope afforesting is achieved. According to an anchor hole based slope afforesting system, the water and fertilizer storing cavity is formed by hole broadening of the hole opening of the anchor hole, and an anchor rod is bended at the bottom of the water and fertilizer storing cavity to form a step shape to be matched with the water and fertilizer storing cavity; the inner space of the water and fertilizer storing cavity is divided into the water storing area and the fertilizer storing area, and the parthenocissus tricuspidata and the kudzu seeds are planted into the prefabricated PVC pipe. According to the anchor hole based slope afforesting method and the system, water preserving and fertilizer preserving can be effectively achieved, the manufacturing cost is low, the afforesting effect is good, the long-acting afforesting effect is good, and the afforesting can be achieved in a short time.

The invention relates to a low-resistance buried-gate solar cell and a manufacture method of the low-resistance buried-gate solar cell. The low-resistance buried-gate solar cell is provided with a front electrode on a light-receiving surface and is provided with a trapezoidal groove with an upper narrow part and a lower wide part on a position, where the front electrode needs to be arranged, of the light-receiving surface of the cell, wherein a trapezoidal buried-gate electrode is arranged in the trapezoidal groove. The manufacture method of the low-resistance buried-gate solar cell comprises the steps of: firstly, making the trapezoidal groove on a part where the trapezoidal buried-gate electrode needs to be formed through a laser grooving method; then injecting electrode slurry in the trapezoidal groove by using a screen printing technology; and finally, forming an electrode through sintering. The low-resistance buried-gate solar cell has the beneficial effects that the contact area of the electrode and silicon is increased by adopting the trapezoidal buried-gate electrode, the contradiction between the metal electrode contact area and the electrode shielding area is eliminated, and the front contact resistance of the battery can be effectively lowered, and the filling factor and the integral efficiency are improved.

The invention relates to semiconductor gas-sensitive sensor technology, and discloses a manufacturing method of an oriented nano-fiberized three-dimensional stereoscopic interdigital electrode of a semiconductor gas-sensitive sensor. The method comprises the following steps: firstly transferring a pattern of an interdigital electrode to a photoresist layer by a traditional photoetching process, etching a monocrystalline silicon substrate by a dry method with the photoresist layer as a mask so as to prepare oriented nano-fibers, sputtering a layer of Pt as a conducting layer on the fiber surfaces by a magnetron sputtering process, and finally peeling off the photoresist layer by a chemical method to obtain the oriented nano-fiberized three-dimensional stereoscopic interdigital electrode of a semiconductor gas-sensitive sensor. Compared with traditional plate interdigital electrodes, the oriented nano-fiberized three-dimensional stereoscopic interdigital electrode contains silicon nanofibers with high specific surface areas which can effectively increase the surface area of the electrode without decreasing interdigital pair numbers, thus can effectively increase the sensitivity of the sensitive electrode, and solves the contradictory relation between the interdigital pair numbers of traditional plate interdigital electrodes and surface areas.