294results about How to "Guaranteed oxygen content" patented technology

The invention discloses a biostimulation method for remediation of oil-polluted soil. In the method, on the premise of not adding an oil pollutant biodegrading bacterial agent, a soil conditioner is added to improve the soil environment, reduce soil stickiness, increase the soil permeability, adjust the water-retaining capacity of the soil, adjust inorganic and organic nutrients necessary for local microbe growth, maintain the pH value of the soil close to neutrality, promote oil pollutant degrading microbes in the soil to grow and propagate, and improve the oil pollutant degrading efficiency of the local microbes; by planting plants, the microenvironment of the soil near root systems of the plants is improved, the plants secrete organics with low molecular weight such as amino acid to the root systems so as to stimulate the massive propagation of the local microbes and indirectly promote oil pollutant degradation by the microbes of the root systems; and the biostimulation method has the advantages of accelerating the remediation of the oil-polluted soil and restoring the original state of the soil.

The invention provides a sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system. According to the process, sintering flue gas is divided into low-temperature high-oxygen low-humidity section sintering flue gas, medium-temperature low-oxygen high-humidity section sintering flue gas and high-temperature high-oxygen low-humidity section sintering flue gas according to the emission characteristics of flue gas temperature and oxygen concentration and humidity. The low-temperature high-oxygen low-humidity section sintering flue gas is subjected to dust removal and then is led into a sintering machine for hot air sintering and hot air ignition. The medium-temperature low-oxygen high-humidity section sintering flue gas is subjected to dust removal and desulfurization treatment. The high-temperature high-oxygen low-humidity section sintering flue gas is mixed with cooling machine waste gas and then is led into the sintering machine for hot air sintering. The sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system can conduct staged utilization on flue gas waste heat, recover low-temperature sensible heat in flue gas, enable carbon monoxide left in the sintering flue gas to be secondarily combusted and reduce the energy consumption in the sintering process on the premise that the quality and yield of sintered ores are ensured. Cyclic flue gas utilization is achieved, the pollutant emission quantity of unit sintering ores and total emission quantity of the sintering flue gas are reduced, and the sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system have very high energy-saving emission-reduction value.

The invention discloses a vertical wall attaching jet air lake mode ventilation system, which comprises a blast pipe (4) and an exhaust duct (11); wherein, an air supply port (6) is arranged close to side wall at the top part of a room; the distance of the air supply port (6) from the side wall is designed into: the ratio between vertical distance of the center of the air supply port (6) from the side wall and the width of the air supply port (6) is 0 to 15. The vertical wall attaching jet air lake mode ventilation system has the advantages of facilitating body health due to being close to the air supply environment, easily arranging the ventilation system in the building space and not occupying building space at the lower part (working area).

The invention discloses a preparation method of aluminum alloy powder for additive manufacturing, and belongs to the technical field of 3D printing additive manufacturing. The preparation method comprises the steps that impurities in raw materials are removed; a graphite rod is added in a crucible to be roasted at the temperature of 300-500 DEG C; a smelting chamber and an atomization chamber are subjected to vacuum pumping treatment, wherein the vacuum degree reaches 1*10<-4>-1*10<-2> Pa; a heat preservation pot and a tundish are heated; metal liquid flow which perpendicularly drops is broken into small liquid drops through a nozzle with a negative pressure drainage effect under the high pressure of 0.5-6 MPa and high-purity argon, powder is formed through cooling and spheroidizing solidification, and a 5-30 kw high-pressure fan is adopted; and after the temperature is lower than 50 DEG C, screening is carried out under the atmosphere of high-purity argon. The preparation method has the advantages that industrial production can be achieved, the domestic urgent demand for high-performance aeronautical aluminum alloy powder materials is met, and the manufacturing cost is effectively saved.

The invention discloses a biomass-charcoal-containing composting system and composting method. The biomass-charcoal-containing composting system mainly comprises the following raw materials in parts by weight: 92-110 parts of basic composting material, 0.3-0.5 part of microbial inoculant and 0.9-1.8 parts of biomass charcoal. The basic composting material comprises sludge and straws, wherein the sludge and straws are mixed, so that the carbon-nitrogen ratio of the basic composting material is 20-30, and the water content of the basic composting material is 50-70%. The method comprises the following steps: mixing the raw materials for constituting the basic composting material, adding the microbial inoculant and biomass charcoal into the basic composting material, and uniformly mixing to obtain the composting system. A three-step fermentation process is utilized to perform composting fermentation on the composting system for 28-32 days, thereby obtaining the biological compost.

The invention relates to a production method of a high-precision ultralong oxygen-free copper strip and belongs to the technical field of oxygen-free copper strip production, processing and manufacturing. The production method of the high-precision ultralong oxygen-free copper strip comprises: (1) selecting electrolytic copper as a raw material, adding the electrolytic copper into a melting furnace, smelting the melting furnace, allowing molten copper to flow into a crystallizer added with an electromagnetic oscillation coil, performing electromagnetic deoxidization of the molten copper and horizontally casting a blank by electromagnetic continuous casting in the electromagnetic continuous casting crystallizer added with the electromagnetic oscillation coil, cooling in the electromagnetic continuous casting crystallizer, crystallizing to form strip copper blanks, and stretching by an ingot leading machine; (2) milling a strip blank by a double-sided miller; (3) performing reversible coarse medium rolling of the copper strip; (4) performing primary trimming by a thick strip longitudinal shearing machine; (5) annealing in a bell type bright annealing furnace; (6) cleaning surface on a thick strip degreasing cleaning line; (7) finely rolling in a four-roller reversible fine rolling machine; (8) annealing a finished product in the bell type bright annealing furnace; (9) cutting the finished product by a thin-strip longitudinal shearing machine; (10) packing in a packaging machine and performing physical and chemical examination; and (11) performing incoming inspection and storing.

An agricultural soil improvement device comprises a box body, wherein a mixing device is fixedly connected to one side of the bottom of the inner cavity of the box body, the inner cavity of a fixing block is fixedly connected with a lifting device, and the bottom of the inner cavity of the box body is in sliding connection with a guide device at one side, far away from the mixing device, of the fixing block, one side, far away from the fixing block, of the lifting device is fixedly connected with a soil turning device, the middle of the top of the inner cavity of the box body is fixedly connected with a crushing device, and one end, close to the mixing device, of the lifting device is communicated with the mixing device. The bottom of one side, close to the lifting device, of the crushingdevice is communicated with the lifting device, and the device relates to the technical field of agriculture. By means of the device, soil can be turned up, the soil hardening degree can be reduced, and a soil conditioner can be crushed and prevented from damaging the soil due to bulk deposition of the conditioner, so that the conditioner and the soil are fully and uniformly mixed, the soil is refined, the oxygen is fully absorbed, the oxygen content of the soil is ensured, the soil is improved, and the device is beneficial to agricultural planting.

The invention provides an industrial cultivation method for preparing agaricus bisporus by using fungi residues of edible fungi. The industrial cultivation method comprises the following steps of establishing a heap by using the following materials in part by weight: 100 parts of wheat straws or rice straws serving as a main material, 20-40 parts of chicken manure, 5-10 parts of plaster, 0.5-1 part of urea and 3-5 parts of cake powder according to the conventional method and turning the heap once; adding 10 parts of the chicken manure in 20-40 parts of fungi residues which are discharged from a bag, smashed and dried, adding water in the mixture and blending the mixture evenly; fermenting various mixed raw materials for 3-5 days and pouring the mixture in a primary fermentation tank; fermenting the main material and auxiliary materials again for 3-5 days; pouring the main material and the auxiliary materials in a secondary fermentation tunnel; forming an air inlet hole in the bottom of a fermentation material pile; properly blowing up and supplying oxygen by using a centrifugal fan; fermenting the main material and the auxiliary materials for 7-10 days; racking and sowing 0.5-1 liter of agaricus bisporus fungi in every square meter of land after the main material and the auxiliary materials are ripe; covering the agaricus bisporus fungi by using soil and producing the fungi; and harvesting the fungi in good time. By the industrial cultivation method, raw materials for producing the agaricus bisporus can be found out easily, and residues generated after industrialized production of pleurotus eryngii and asparagus are circularly and efficiently utilized.

The invention belongs to the technical field of sludge treatment, and particularly relates to a dehydration treatment method for reducing the water content of sludge. The method comprises the two procedures of mixing and granulating the sludge, a dry material, straws and a composite strain BYM, and performing stacking fermentation. According to a principle for the dehydration method for reducing the water content of the sludge in a microbial fermentation way, a great amount of heat can be produced in a microbial fermentation process, and can be used for reducing the water content of the sludge with low cost. Compared with the prior art, the method has the advantages of low energy consumption, low material consumption and low cost; the water content of the fermented sludge is reduced to be lower than 30 percent, the sludge has great development potential, and can be used as an organic compound fertilizer or a building material, and the resource utilization of a product is facilitated.

The invention discloses rare earth microalloying bearing steel and a preparation method thereof and belongs to the technical field of bearing steel manufacturing. According to the technical aim, the performance of the bearing steel is improved. According to the rare earth microalloying bearing steel, converter, LF-RH refining and square billet continuous casting are carried out, electroslag remelting is carried out after scaling of a prepared continuous casting billet, then cover cooling and pit cooling are carried out, and then primary heating rolling cogging is carried out; after annealing or slow cooling is carried out, checking and cleaning are carried out, and a primary rolled steel billet is prepared and subjected to secondary heating rolling; and after stack cooling or slow coolingis carried out, a secondary rolled steel billet is prepared and subjected to spheroidizing annealing, straightening, polishing or scaling, flaw detection, cleaning and checking are carried out, and then the rare earth microalloying bearing steel is prepared. The content design ingredient of Nb ranges from 0.010% to 0.45%, and the rare earth microalloying bearing steel is suitable for being used for manufacturing various bearing rings and rolling elements and roller pins within a wide size range.

In the hazy weather, after doors and windows are tightly closed, outdoor fresh air rich in oxygen is not led in, and obviously the health of a human body is not facilitated. Therefore, a fresh air haze removal air conditioner unit is established, and has the function of deeply treating fresh air and the effects of energy saving, environmental protection and the like. The air conditioner unit is mainly composed of a heat pump unit (10) and a fresh air haze removal device. The fresh air haze removal device enables outdoor polluted air led in by a fan (9) to be subjected to deep treatment for purification. Meanwhile, the heat pump unit (10) adjusts the air flow temperature and humidity. At the moment, the air flow is fed into a room through a fan (7), and a proper sealed space with the sufficient oxygen content, the micro positive pressure and small pollutions is built. The heat pump unit (10) and the energy storage water tank (2) build an energy storage system for a main body, and valley electricity is converted into energy to be used in daytime. In addition, air conditioner condensate water in all rooms is utilized for supplying water to the energy storage water tank, and the two measures have the good energy saving effect. A common fresh air hazy removal air conditioner unit without the heat pump unit (10) is designed, and is cheap and practical and saves energy.

The invention provides an indoor air processor. The indoor air processor comprises a box body, a plant cultivating system, an oxygen and carbon dioxide gas control system, a particle filter system and a harmful gas detection and control system, wherein the box body is provided with a gas inlet end and an exhaust end, and the gas inlet end comprises an indoor air valve and an outdoor air valve; the plant cultivating system comprises a plant plating module and an illumination module which are arranged in the box body, and the illumination module at least can emit the illumination light with two different wavelengths; the oxygen and carbon dioxide gas control system is used for detecting the concentrations of indoor oxygen and carbon dioxide gas and controlling the indoor air valve and outdoor air valve to open and close; the particle filter system is used for filtering particles flowing by the indoor air processor; and the harmful gas detection and control system is used for detecting the type and concentration of harmful gases and controlling the growth of a specific plant in the plant planting module through the illumination module. The indoor air processor is matched with different plants according to indoor decorative color, so that different harmful gases can be absorbed on purpose, the purifying effect can be realized as long as the plants are alive, the process of purifying the air is energy-saving and environment-friendly, and no waste is produced in the entire process.

The invention discloses a preparation method for a low oxygen content and high alloying nickel-based mother alloy and powder and belongs to the field of powder metallurgy. The technological process of the preparation method includes the steps that firstly, a pure mother alloy ingot is prepared by means of duplex processes of vacuum smelting and electroslag remelting. In the process of vacuum smelting, a calcium oxide crucible is adopted, raw materials are pre-treated, carbon blocks are added in a refining stage for deoxidization, elements prone to the burning loss are supplemented at the end stage of smelting, and the mother alloy ingot in designed components is obtained. In the process of the electroslag smelting, by adjusting the shape, the depth, the viscosity and other parameters of a slag pond, the float-up condition of the nonmetallic inclusion is created, and the mother alloy is further purified. After the mother alloy ingot subjected to electroslag remelting is subjected to scaling, the mother alloy ingot is subjected to high-speed disk grinding breakage under the protective atmosphere, and the ultra-thin mother alloy powder is obtained. The particle size of the K418 mother alloy powder prepared through the method is smaller than 20 microns, the oxygen content is lower than 200 ppm, the sulfur content is lower than 20 ppm, after the alloy podwer is mixed with carbonyl nickel powder, sintering compacting at low temperature can be achieved, and the production cost and the process energy consumption of a high temperature alloy of the powder are greatly reduced.

The invention relates to the technical field of air conditioning, in particular to an air conditioning indoor unit and a control method thereof and aims to solve the problem of high noise of an existing air conditioner when the supplied air volume is high. The air conditioning indoor unit comprises an indoor unit body, and a heat exchanger and a blower are arranged in the indoor unit body; the airconditioning indoor unit further comprises an air supplement module; the air supplement module comprises a shell body, an air inlet pipe communicating with the outdoor is arranged on the shell body,and an induced draft fan and a connecting pipe are arranged in the shell body; the first end of the connecting pipe is connected with the air outlet of the induced draft fan, and the second end of theconnecting pipe extends to the air inlet side of the heat exchanger; the air supplement module is driven by the induced draft fan to introduce the outdoor fresh air into the shell body and exhaust the outdoor fresh air into the air inlet side of the heat exchanger after the outdoor fresh air flows through the induced draft fan and the connecting pipe; and a drainage plate is arranged on the connecting pipe and introduces the nearby air into the connecting pipe when the induced draft fan works. By arranging the air supplement module, the noise of the air conditioning indoor unit during runningof the air conditioning indoor unit can be greatly reduced.

The invention provides a soil conditioner and a preparation method thereof. The soil conditioner comprises, by weight, 12 to 20 parts of plant ash, 5 to 10 parts of phosphorous slag, 5 to 9 parts of quicklime, 2 to 5 parts of zeolite, 2 to 5 parts of attapulgite, 1 to 3 parts of Yilong seaweed ooze, 2 to 5 parts of Chinese magnoliavine residues, 2 to 5 parts of large-flowered skullcap root residues, 20 to 30 parts of straw, 8 to 13 parts of hickory nut shells, 0.02 to 0.04 part of rotenone, 10 to 15 parts of mangosteen shells, 3 to 5 parts of an EM microbial agent, 7 to 20 parts of urea phosphate, 8 to 14 parts of urea, 10 to 15 parts of biochemical potassium fulvate and 9 to 12 parts of gamma-polyglutamic acid. The invention has the beneficial effects that the soil conditioner has high porosity and has specific adsorption effect on heavy metal ions; the soil conditioner can adjust the pH value of soil, is rich in trace elements and can elemental N, elemental P and elemental K at the same time; and the soil conditioner allows soil to maintain high porosity and to be long in fertility maintenance time and good in water retention performance.

The invention relates to the technical field of air conditioning, in particular to an air supplement device for an air conditioner indoor unit and the air conditioner indoor unit. According to the airsupplement device, the problems of supercooling / superheating of supplied air and large noise when the air supply amount of an existing air conditioner is large are solved. The air supplement device comprises an air inducing module and a flow jetting module. The air inducing module comprises a first shell. The first shell is provided with an air inlet pipe communicating with the outdoor space andinternally provided with a purifying assembly and a draught fan. The flow jetting module comprises a second shell. The second shell is provided with an air inlet and an air outlet. The air inlet communicates with an air exhaust opening of the draught fan. A flow jetting channel is formed between the air inlet and the air outlet. The flow jetting module is arranged to allow outdoor fresh air from the air inducing module to flow through the flow jetting channel and then be sprayed out through the air outlet and enable the outdoor fresh air to be mixed with an air phase exhausted by an air supplying opening of the air conditioner indoor unit. According to the air supplement device, the phenomena of supercooling / superheating of supplied air of the air conditioner indoor unit can be relieved, and running noise of the air conditioner indoor unit is reduced.

The present invention relates to a stem shreds drying tower moisture control method. Said method is characterized by that said method includes the following steps: using an oxygen content detection sensor to detect oxygen content in the stem shreds drying tower equipment, when the oxygen content is greater than or equal to 5% or is less than or equal to 5.6%, the pressure loop set value is retained and not changed, when the actual oxygen content is less than or equal to 5% or greater than or equal to 5.6%, the pressure loop set value can be respectively increased or reduced, and detect pressure of pressure loop and compare said pressure with pressure loop set value; using a PID controller to control moisture discharge valve according to the difference value, always retain that the interior pressure of stem shreds drying tower equipment is followed after the pressure loop set value; and using an outlet moisture instrument to detect moisture of material, when the outlet moisture and outlet moisture set value are not identical, calculating water-adding set value, comparing the water quantity detected by water-adding flow-rat sensor with said water-adding set value, using PID controller to control water-adding regulation valve according to its different value and making outlet moisture always be followed after outlet moisture set value.

The invention discloses a method for controlling nitrogen content of molten steel in converter steel-making. The method comprises the following steps: smelting molten iron into molten steel by using a converter; opening a steel ladle and performing bottom argon blowing before tapping; and in the tapping process, determining the quantity of a deoxidant added into the steel ladle according to the oxygen content of the molten steel in the converter so as to ensure that the oxygen content of the molten steel after tapping is more than 50ppm, thus preventing the molten steel from contacting air to absorb nitrogen. According to the method for controlling the nitrogen content of the molten steel in converter steel-making disclosed by the invention, the quantity of the deoxidant added into the steel ladle is determined according to the oxygen content of the molten steel in the converter so as to ensure that the oxygen content of the molten steel after tapping is more than 50ppm, namely that, the converter is not subjected to complete deoxidation in the tapping process so as to ensure that oxygen in the molten steel occupies the surface of the molten steel, and prevent the molten steel from contacting the air to absorb nitrogen, thus controlling the nitrogen increasing amount of the molten steel, for example, by adopting the method disclosed by the invention, the nitrogen increasing amount of the molten steel can be controlled within 0.0008%.

The invention discloses a method for breeding crayfish in a paddy field and a preparation method of the crayfish, and relates to the technical field of ecological agriculture. The method comprises the following steps that firstly, the paddy field is transformed and constructed; secondly, the paddy field is cleaned and disinfected; thirdly, rice seedlings are transplanted; fourthly, crayfish fry are put into the paddy field; fifthly, feed putting is conducted; sixthly, the paddy field is fertilized; seventhly, the crayfish is caught. According to the method, crayfish breeding is more reasonable and more environmentally friendly, and is matched with paddy field cultivation to achieve the ecological recycling and symbiosis.

The invention discloses a method for regulating and controlling circulating flue-gas temperature and oxygen content. A thermometer, a flowmeter, a pressure meter and an oxygen amount analysis meter are arranged on a pipeline (14) for connecting sintering machine air boxes (6) and a large flue and a circular cooler hot exhaust gas circulating pipeline (24) and used for monitoring the temperature, flows, pressure and the oxygen content of smoke of the sintering machine air boxes and hot exhaust gas of a circular cooler and calculating the smoke of the air boxes and standard flows of the hot exhaust gas of the circular cooler. According to the requirement for the temperature of the smoke discharged by an electric dust remover of the large flue, the sintering machine air boxes for smoke exhausting are allocated. A regulating valve (23) installed on the circular cooler hot exhaust gas circulating pipeline is utilized to regulate the hot exhaust gas flows of the circular cooler so as to regulate and control the circulating flue-gas temperature and the oxygen content. The circulating flue-gas temperature and the oxygen content are actually measured through the thermometer and the oxygen amount analysis meter arranged on a connecting pipeline (6) between a sintering machine fan housing (5) and a mixer (17), the hot exhaust gas flows of the circular cooler are corrected, and accordingly the circulating flue-gas temperature and the oxygen content are accurately controlled.

The invention relates to a steel for a high-strength mining machine, which comprises the following components in percentage by weight: 0.32-0.39% of C, 1.10-1.40% of Si, 0.80-1.10% of Mn, 0.005-0.020% of P, 0.001-0.025% of S, 1.10-1.40% of Cr, 0.01-0.20% of Cu, 0.01-0.30% of Ni, 0.010-0.060% of Al, 5-20*10<-6> of O, and the balance of Fe and inevitable impurities. The invention also provides a preparation method of the steel for a high-strength mining machine. The steel provided by the invention has excellent comprehensive properties; and the cutting picks of the manufactured heading machine satisfy the operational requirements for large-size mining machines, and enhance the coal production efficiency and economic benefit.

The invention belongs to the field of rice cultivation and discloses a seed ventilated soaking method in rice seed accelerating germination. The method comprises the following steps: soaking rice seeds in a seed soaking solution, introducing gases into the soaked rice seeds every 10 minutes for 5-10 minutes for ventilating, controlling the temperature to be 25 DEG C within 24-72 hours before the seed soaking and accelerating germination process, regulating the temperature to be 32 DEG C within the subsequent 24-48 hours, soaking the seeds under the condition of constant temperature until the seeds are broken and exposed, regulating the temperature to be 26 DEG C within the subsequent 24 hours for accelerating germination. According to the method, air is introduced into the bottom of the seed soaking solution in the seed soaking process, the oxygen content in the air in the soaking solution is guaranteed, and the problem that the water lacks of oxygen in the seed soaking process is solved. According to the method, the germination rate of rice seeds is 83.4 percent and is improved by 27 percent compared with the ventilation-free seed-soaking accelerating germination rate of 65.7, and the germination rate of the seeds is obviously improved. Moreover, the germination rate of the seeds is improved, the cost of the seeds can be saved, particularly the cost of hybrid rice seeds is saved, and the rice production is stabilized.

The invention provides a movable vehicle-mounted automatic deep well rescue device, which comprises a trailer, a support seat, an upper computer, a PLC (programmable logic controller) control cabinet, a power supplying power source, a cantilever, a multistage telescopic hydraulic cylinder and a hydraulic pump, wherein the support seat is arranged on the trailer, the cantilever is arranged on the support seat, the multistage telescopic hydraulic cylinder is arranged at the end part of the cantilever end, the hydraulic pump drives the multistage telescopic hydraulic cylinder, the top end of the multistage telescopic hydraulic cylinder is provided with a bracket mechanism, and the PLC control cabinet controls and connects an electric control valve of the hydraulic pump and the bracket mechanism. The movable vehicle-mounted automatic deep well rescue device has the advantages that the design is scientific, the rescue speed is high, the automation degree is high, the operation is simple, and flexibility is realized.

The invention belongs to the technical field of agricultural planting and particularly relates to an agricultural intelligent soilless culture device. The agricultural intelligent soilless culture device comprises a culture unit, a liquid mixing unit and a controller, wherein the controller is used for controlling the culture device to work; the culture unit comprises a culture tank, a filtering plate, a clamping component, a sliding rod, a spring I, a mounting plate, a hinging rod and a swing plate; the culture tank is of a transparent tank body structure with an opening upper side surface soas to facilitate the observation and is used for culturing plants, and the filtering plate is arranged in the culture tank; the sliding rod is arranged and is used for driving the swing plate to swing leftwards and rightwards in a nutrient solution, so that the flow of the nutrient solution in the culture tank is realized, nutrients in the nutrient solution are uniformly distributed, the growth vigor of the plants is probably the same, and the quality of the plants are easily controlled; and by arranging the liquid mixing unit, the efficient preparation of the nutrition solution is realized,and the prepared nutrition solution can be relatively high in uniformity.

The invention discloses an aerobic composting device and aerobic composting method for organic solid waste. The aerobic composting device comprises a composting bin, a fire-grate type feeding device, a screw rod extruding dehydration discharging device, an oxygen supply device, a leachate circulating spraying device, an exhaust pipe and a temperature measuring device, wherein the fire-grate type feeding device and the screw rod extruding dehydration discharging device are arranged in the composting bin; and the fire-grate type feeding device is positioned under the screw rod extruding dehydration discharging device. According to the aerobic composting device disclosed by the invention, a structure that the fire-grate type feeding device and the screw rod extruding dehydration discharging device are combined is used, through combination of gradation type feeding and screw rod dehydration discharging, the effects of high efficiency and favorable turning are achieved, materials are sufficiently and uniformly mixed, and the materials are loose; and the loose materials accelerate combination of oxygen in air with substrates, so that the oxygen supply efficiency is improved.

The invention discloses a preparation method of metal chromium powder special for a high-performance CuCr electrical contact. The preparation method comprises the steps of crushing, specifically, a chromium block is placed into a crusher and crushed into granules; screening the granulated chromium block by using a 10-mm aperture screen, and selecting undersize chromium particles; grinding, specifically, the chromium particles are added into low-temperature grinding powder manufacturing equipment, and a cooling medium is introduced to obtain the metal chromium powder; screening again, specifically, the metal chromium powder is respectively screened by using a 200-mesh screen, a 240-mesh screen and a 320-mesh screen; and detecting, specifically, oxygen content in the metal chromium powder isanalyzed by using a nitrogen-oxygen analyzer and is required to be no greater than 600 ppm. According to the preparation method of the metal chromium powder, the oxygen content in the chromium powdercan be effectively controlled; and the chromium powder is not prone to segregation after being mixed with Cu powder, has good formability, and has good wettability of Cr and Cu after sintered.

The invention relates to maotai-flavor baijiu two-sided accumulative fermentation technology which comprises the following steps: A1, stacking: evenly paving 5 to 10Kg of high-temperature hard liquormaking yeast to form a round area with a radius as 2 to 4m, arranging a plurality of circumferential faces with openings at the two ends on the round area to form a round venting barrel with a plurality of venting gaps and stacking aired fermented grains on the round area to form a semispherical fermentation pile, wherein a temperature of the fermented grains is 32 to 35 DEG C in stacking; A2, stacking up: stacking aired fermented grains which are evenly mixed with yeast on the fermentation pile layer by layer; A3, fermenting; A4, identifying. The invention further discloses a maotai-flavor baijiu brewing technology and jiang-flavor prepared by the two-sided accumulative fermentation technology or the brewing technology and belongs to the technical field of brewing. According to the maotai-flavor baijiu two-sided accumulative fermentation technology disclosed by the invention, a contact area between the fermented grain pile center and environment is improved, a temperature of the pilecenter is closer to a temperature of the surface, and the temperature of the pile center is improved by 10 to 20 DEG C; thus, accumulative fermentation quality is improved.

The invention discloses a pond culture method of loaches, belonging to the field of aquiculture. The method comprises the following steps of: draining all water in an earthen pond in the last quarter, splashing quicklime, performing light illumination for 2-3 days, then injecting water, starting to dress a fertilizer, then releasing seedlings for 4-6 days, putting in 120-145kg of animal manure per mu, enabling the transparency of a water pond to be 20-30cm, and then putting in larvae of the loaches, wherein the larvae are immersed in 2-3% common salt water before the larvae are put in; and starting to put baits in the earthen pond when the water temperature is higher than 15 DEG C, wherein the feeding amount per day is 1-3% of the body weight of the loaches and the feeding amount is increased along with the increase of the air temperature, the water is changed once every week in spring and autumn, the water is changed once every 2-4 days in summer, and the water change amount every time accounts for 1 / 3-2 / 3 of the total water amount. The larvae of the loaches are immersed in the common salt water before putting in so as to prevent saprolegniasis and simultaneously enhance the resistance of the loaches to pathogenic bacteria. According to the pond culture method disclosed by the invention, the survival rate of the loaches in summer is significantly improved, the oxygen content in the water is ensured, and the yield of the loaches is improved. The pond culture method disclosed by the invention is particularly suitable for higher-density culture of the loaches.

The invention provides a pawpaw seed germination accelerating method. The method specifically includes steps of disinfection treatment, ventilation seed soaking, constant-temperature germination accelerating and seeding. By disinfecting and soaking seeds, germination rate of the seeds is increased and can be increased by 6-8%, and germination period is shortened by 1-2 days; pawpaws planted by the method are fresh and tender in quality, good in taste and high in nutritional value, the method is simple to operate, planting cost is lowered, economic benefit is increased, and the method is suitable for large-scale production and popularization.

The invention discloses a combined type artificial wetland sewage treatment system and a combined type artificial wetland sewage treatment method. The system comprises an ecological regulation sedimentation tank, a two-way cross-flow ecological filtration unit, a multi-layer medium subsurface flow wetland, a baffled subsurface flow wetland, a surface flow wetland, an ecological artificial lake, acommunicating pipeline of the ecological artificial lake and a water distribution channel which are sequentially connected with each other. The system and the method create a nitrification-denitrification environment for microbial denitrification by combining the two-way cross-flow ecological filtration unit, the multi-layer medium subsurface flow wetland and the baffled subsurface flow wetland, thereby enabling the treatment system to realize a good denitrification effect; after sewage is lifted at a time, the lifting of the sewage relies entirely on gravity water distribution, so that energyconsumption is not generated during treatment. Furthermore, building waste blocks are used as wetland packing, so that resource recycling is realized, and the construction cost is lowered.