152results about How to "Guaranteed growth rate" patented technology

The invention provides a breeding method for intermediate breeding of Anguilla marmorata fries. The breeding method comprises the steps of intermediately breeding the Anguilla marmorata fries in a cement breeding pond in the early stage and breeding the Anguilla marmorata fries in an earthen pond in the later stage. A net box and water flow boosters are arranged in the process of intermediately breeding the Anguilla marmorata fries in the cement breeding pond in the early stage, and the Anguilla marmorata fries are bred in the net box, so that the metabolites of the Anguilla marmorata fries can be conveniently filtered and deposited, the survival environment is optimized, and the breeding survival rate is increased; the four water flow boosters are arranged at the four corners of the cement breeding pond, so that water flow circulates anticlockwise, a flowing water environment is created for the Anguilla marmorata fries, Anguilla marmorata can frequently move in the flowing water environment, the bait intake speed and the growth speed of the Anguilla marmorata are increased, and the survival environment of the Anguilla marmorata is optimized; the Anguilla marmorata fries are bred for 1-2 months in the cement breeding pond and fed with blood worms in the early stage and eel powder 7 days before leaving from the pond, after the Anguilla marmorata fries are fed with the eel powder, the Anguilla marmorata fries reaching 1 g per fry are transferred into a half mu (1 mu is 1 / 6 of acre) of the earthen pond for later breeding of the Anguilla marmorata fries, and the unqualified Anguilla marmorata fries are still concentrated in the cement breeding pond and continue to be fed with the blood worms; and during the process of breeding the Anguilla marmorata fries in the earthen pond, the Anguilla marmorata fries are mainly fed with the eel powder in the early stage and occasionally fed with the blood worms, all the Anguilla marmorata fries reaching 5 g per fry are fed with the eel powder, and the Anguilla marmorata fries reaching 10 g per fry are transferred into an Anguilla marmorata growing pond for breeding.

The invention relates to a penaeus vannamei boone low-salinity culturing method. During seed culturing, the salinity is 8 to 100%; in the phase of juvenile shrimps, the salinity of a culturing water body is increased to 6%; in the phase of middle-age shrimps, the salinity of the culturing water body is reduced to 4%; in the phase of adult shrimps, the salinity of the culturing water body is reduced to 2%. The method has the advantages that the secondary virus disease caused by the infection of pathogen of penaeus vannamei boone in seawater is avoided, meanwhile, the growth speed of the penaeus vannamei boone is ensured, and the economic benefit of a farmer is protected; by utilizing the habits of Chinese soft shell turtles, silver carps or bighead carps using planktons as foods, the amount of seaweed in water is controlled, so the water quality is improved, the waste at water body resources is avoided, and better economic benefits can be obtained.

The invention discloses a silicon rod growth rate prediction model in a polycrystalline silicon reduction furnace, comprising a data acquisition and preprocessing module, which is used for acquiring data related to the silicon rod growth rate through a sensor and cleaning the acquired data; The data set screening module used for screening the data set after data collection and data cleaning of thedata collection module to obtain a training set and a test set; The Training and evaluating module, which is used for training the gradient lifting decision tree model and evaluating the model by using the average relative error and the eligibility rate; a prediction module, which is used for inputting the feature vector to be predicted; The prediction result module used for inputting the featurevector to be predicted into the prediction model and outputting the prediction result. The invention abandons the influence of complex chemical reaction on the growth rate in the traditional theoretical research, does not need to consider the complex chemical reaction, realizes the prediction of the growth rate of polysilicon, and provides guidance for improving the production efficiency and shortening the production cycle.

The invention relates to a method for breeding penaeus vannamei boone by using ozone water. Water inside a breeding pond is introduced from a natural sea area; after being subjected to sedimentation in the pond, dark sedimentation, treatment by a sand filtering tank and treatment by an ozone machine, the water is introduced into the breeding pond; during the period of breeding, the content of ozone in the water inside the breeding pond is regularly detected so as to be maintained 0.2-0.5ml / L. According to the method, the body immunity of the penaeus vannamei boone can be improved, and the possibility of disease outbreak to the penaeus vannamei boone is decreased; the growth speed of the penaeus vannamei boone is guaranteed, so that the economic benefits of farmers are protected; ozone is used as a sterilizing and harm-elimination substance safely, reliably and efficiently; oxygen atoms with a strong oxidizing performance, decomposed from the ozone, can reach a disinfecting purpose; moreover, the other product, i.e. oxygen, decomposed from the ozone, not only is safe without causing pollution to the water, but also can increase the concentration of dissolved oxygen in the water, thus being beneficial to growing and surviving the penaeus vannamei boone.

The invention relates to a traditional Chinese medicine for treating tonsillitis and pharyngitis, which belongs to the traditional Chinese medicine. The traditional Chinese medicine for treating tonsillitis and pharyngitis is prepared by grinding the following raw materials with weight parts,30-60 parts of Boat-fruited Scaphium Seed, 30-60 parts of Radix Ophiopogonis, 30-60 parts of subprostrate sophora, 20-40 parts of peppermint and 20-40 parts of Platycodon grandiflorum. According to the invention, various components are organically combined, and have the functions of dispelling wind evil, clearing away heat, relieving sore throat for removing edema and the like. The traditional Chinese medicine for treating tonsillitis and pharyngitis has the advantages of no side effect and obvious healing effect.

The invention discloses a high-quality silicon carbide single crystal, and a substrate and an efficient preparation method thereof, and belongs to the field of semiconductor materials. The preparationmethod comprises the following steps: putting raw materials and seed crystals into a crucible, assembling the crucible and a heat preservation structure into a crystal growth furnace, arranging a heating coil assembly at the periphery of the side wall of the crystal growth furnace, and mounting an adjusting mechanism; removing impurities; and growing the crystal, wherein the heating coil assemblycomprises a first coil assembly arranged corresponding to a raw material area and a second coil assembly arranged corresponding to a crystal growth area, and the inner diameter of the second coil assembly is increased in the direction from raw materials to seed crystals. The preparation method of the silicon carbide single crystal is characterized in that the axial temperature gradient in a growth cavity is formed, so the high-quality silicon carbide single crystal can be prepared; the radial temperature gradient in the growth cavity for growing the single crystal is adjusted, so the crystalgrowth rate and the crystal growth quality are improved; and the radial temperature gradient is reduced, and a certain axial temperature gradient can be ensured, so the high-quality silicon carbide single crystal can be efficiently prepared.

The invention discloses a cultivation method for clump planting of arbor. The method includes the following steps of seedling selection, seedling processing, seedling clump planting, watering for root fixing, spray wet curing and mushroom soil covering. Through the method, in the whole cultivation process of clump planting of arbor, the seedling selection, soil selection, plant water retention and soil water retention are scientifically controlled, and the problems of trunk peeling and slow root system growth easily occurring in the seedling clump planting are effectively solved. Root systems between seedlings planted through the cultivation method for clump planting of arbor are easy to twine to form an integrated root system, so that the problem of uneven seedling growth is solved, and integrity between seedlings is improved. Compared with the natural growing cluster seedling, the manifestation of the whole cluster of seedlings has more shaping advantages and better cost performance ratio.

The invention provides an intelligent control system for pig house environment, which belongs to the technical field of pig farm breeding equipment, including STM32 single-chip microcomputer, operation panel, sensor, input module, output module, frequency converter, variable frequency fan contactor, variable speed fan, wet curtain contact device, cooling pad, constant speed fan contactor and constant speed fan. The temperature, humidity and ammonia control parameters of the pig house environment automation control system of the present invention can be adjusted by themselves, and different houses can adjust the control range of temperature, humidity and ammonia according to the needs, so as to give pigs a suitable growth environment, Guarantee the health and growth speed of pigs, and increase the economic benefits of the farm; the system of the present invention adopts highly intelligent and humanized design, fully automatic operation control according to the set parameters, no need for on-site personnel, 24-hour all-weather operation, one-time input, benefit for ten years.

The invention discloses a preparation method of a stichopus japonicus microorganism degumming kelp fermented feed. The preparation method comprises the steps: adding microecologics capable of degrading sodium alginate in kelp in a basal feed with the kelp as a main raw material and fermenting, wherein the basal feed comprises the following components in percent by weight: 45-55 percent of kelp meal, 5-15 percent of fish meal, 25-35 percent of sea mud, 5-10 percent of shell powder and 1-5 percent of decavitamin and mineral substances, and the amount of the microecologics is 1-5 percent of the weight of the basal feed. According to the feed disclosed by the invention, the digestibility and utilization rate of stichopus japonicus to the kelp can be remarkably increased, the nutrition and energy level required by the growth of the stichopus japonicus are met, the problem of deficiency of sargassum thunbergii resources of an excellent bait for the stichopus japonicus is effectively solved; and the feed has a raw material value-added function, and is low in cost. Under a better ecological condition, the feed is capable of reducing the damage of the residual bait to a culturing water body, promoting the immunity of the stichopus japonicus to a certain extent, and preventing antibiotics from being used.

The invention belongs to the technical field of carbon material preparation. The invention relates to a preparation method of a carbon nanotube array, in particular to a preparation method of a super-long few-walled carbon nanotube array. According to the method, a lamellar material is used as a carrier, wherein the size and the distribution density of active particles of the catalyst are regulated and controlled through a stoichiometric ratio; cheap carbon-containing gas or liquid is used as a carbon source; a catalyst is loaded by a container, and sulfur element is introduced, so that the contact surface between the catalyst and the carbon source gas is fully enlarged, the growth space of the carbon tubes is enlarged, and the few-wall super-long carbon nanotube array is prepared; the growth rate is more than 10 times of the ratio of the mass of the grown carbon nanotubes to the mass of the used catalyst, the length can reach more than 200 microns, and the Raman IG / ID value is not less than 3.0. The preparation method is simple and efficient, low in raw material cost, high in product purity and excellent in graphitization degree, industrial production can be achieved by carrying large equipment such as an industrial rotary furnace, a fluidized bed and a moving bed, and the preparation method has great significance in promoting industrial production and application of high-quality carbon nanotubes.

The invention discloses a silicon carbide single crystal growth device, which comprises a first graphite crucible capable of accommodating silicon carbide powder. At least two layers of graphite baffle plates are also arranged in the first graphite crucible, and the graphite baffle plates divide a channel between silicon carbide seed crystals and the silicon carbide powder into a plurality of communicating channels connected by S-shaped channels. When the silicon carbide single crystal growth device works and the SimCn atmosphere containing tiny carbon particles flows in the communication channel, the tiny carbon particles are subjected to resistance larger than that of gas at the turnings of the communicating channels, and the tiny carbon particles are deposited at the turnings, so that the purpose of reducing wrappage in the silicon carbide single crystal is achieved, and the inclusion is prevented from influencing the silicon carbide single crystal quality and the crystal growth speed. The invention further provides a silicon carbide single crystal growth method, in which carbon particles can be generated in the decomposition and sublimation stages of the silicon carbide powder, the carbon particles move along the communicating channels and are deposited in the communicating channels, silicon steam reacts with the carbon particles, and the silicon carbide single crystal grows on the surface of the silicon carbide seed crystal.

The invention relates to the technical field of flowerpot trays, in particular to a form-convertible flowerpot tray with an adjusting function. The flowerpot tray comprises a bottom plate, three supporting legs are mounted on the lower surface of the bottom plate, first sliding grooves are formed at the front, rear, left and right sides of the lower surface of the bottom plate, and first sliding blocks are mounted in the first sliding grooves; and a first limiting hole is formed at the top of each first sliding groove, a limiting rod is installed on the upper surface of each first sliding block, the limiting rods are located in the first limiting holes, a fixing frame is installed on the upper surfaces of the limiting rods, four telescopic rods are installed on the upper surface of the bottom plate, and a tray body is installed at the ends, away from the bottom plate, of the four telescopic rods. According to the flowerpot tray, through mutual cooperation of structures, water drainageis facilitated, the height of a flowerpot can be adjusted, the flowerpot tray can be changed into a hanging form, the practicability of the flowerpot tray is improved, people can use the flowerpot tray conveniently, and growth of plants in the flowerpot is facilitated.

The present invention relates to a penaeus vannamei compound feed which includes the following raw materials in parts by mass: schizochytrium limacinum meal 15-20 parts, fish meal 20-25 parts, shrimp shell powder 2-4 parts, cuttlefish powder 2-4 parts, peanut meal 10-15 parts, soybean meal 15-20 parts, flour 15-20 parts, complex vitamins 0.3-0.4 part, choline chloride 0.3-0.4 part and zeolite powder 2-3 parts. The replacement of part of fish meal with the schizochytrium limacinum meal reduces the feed costs; The addition of the schizochytrium limacinum meal enables the amino acids of the feed to be more balanced and complementary, therefore improving the feed efficiency; the schizochytrium limacinum meal is rich in active substances which can enhance the immune function of the penaeus vannamei, prevent the occurrence of diseases, reduce drug use in shrimp farming, improve the survival rate and growth rate of the penaeus vannamei. The schizochytrium limacinum meal contains DHA, significantly reduces or completely doesn't require the addition of fish oil, reduces the excessive reliance on fish meal and fish oil, and the marine fish resources are protected, at the same time the feed cost is reduced and the shrimp farming benefit is improved.

The invention relates to a low-cost matched breeding method for white feather broilers. According to the method, recessive white Plymouth rocks serve as a specialized strain female parent paternal line, high-yield laying hens serve as a specialized strain female parent maternal line, the recessive white Plymouth rocks and the high-yield laying hens are hybridized to generate female parents, and aCornish variety serves as a male parent to be hybridized with the female parents to generate a commercial generation of a specialized strain. Leukemia and pullorum disease full-group general test is preferably carried out on specialized strain progenitor chicken flocks, regular spot test is carried out on the parents, and leukemia individuals and pullorum disease positive individuals are eliminated. Pure line breeding is preferably carried out on the specialized strain paternal line, the female parent paternal line and the female parent maternal line. The breeding cost of the commercial generation is reduced, the growth speed of the commercial generation can be ensured, and the production cost is reduced.

The invention discloses an intelligent feeding system and a method. A circulating grass feeding system is adopted, and a cultivated grassland unit is input in a lawn for providing fresh feeding grass for fed animals; a used grassland unit is also recycled for use by a feeding grass cultivating chamber; a circulating type, an intelligent and automatic type circulating grass feeding mode is formed; drinking flowing water is provided for the fed animals through a water groove in the lawn; opening and closing of an open-close type ceiling are controlled through a microprocessor based on data acquired by a light sensor, a rain sensor and a temperature sensor; and actions of refrigeration air conditioning equipment, a fan and heating equipment are controlled through the microprocessor based on data acquired by the temperature sensor and a humidity sensor. The intelligent feeding system is clever in system construction, simple in structure, easy to implement, high in automation degree, environment-friendly, and intelligent.

The invention relates to the field of auxiliary devices of the diary cow technology, in particular to a feed and water feeding device for dairy cow cubs. The device comprises a trough body, the trough body comprises a front plate, a feeding port is formed in the lower portion of the front plate, the middle of the front plate is provided with a vertical strip-shaped sliding hole, a partition board is fixedly arranged on the side, close to the front plate, in the trough body, a feedinlet is formed in the portion, close to the bottom, of the partition board, feed can slide out of the discharge opening, an L-shaped water tank is arranged between the partition board and the front plate, the L-shaped water tank can slide up and down to open and close a water outlet of a water box, a cavity for storing water is formed in the L-shaped water tank, the horizontal section of the L-shaped water tank extends out of the sliding hole, a water drinking port is formed in the portion, extending out of the sliding hole, on the horizontal section of the L-shaped water tank and is communicated with the cavity, and the vertical section of the L-shaped water tank can cover the discharge opening. The L-shaped water tank is full of water, a certain amount of feed is placed from the feed inlet to achieve the quantitative feeding aim, and the diary cow cubs can also be fed with water.

The invention belongs to the technical field of tree planting, and relates to a planting method of a raspberry with an early mature period, in particular to a planting method of the raspberry. The planting method of the raspberry is perfect and comprises steps as follows: (1), neutral sandy loam is selected for planting, blackberries can be planted in soil with the PH(potential of hydrogen) being 8.2 while some varieties of cranberries cannot grow well when the PH value of the soil exceeds 7.5; (2), frames are required to be set up for creeping and suberect varieties in the second year after field planting, trimming is required at the end of the fruiting period or in spring every year, and the plant shape is controlled; (3), the climate is selected, the optimum climate condition for the cranberries is that the weather is cooler in summer and less rain falls in the harvesting season; (4), soil is selected, the raspberry is a shallow-root light-loving plant, flat land with good drainage and without obstructions or a gentle slope is required to be selected for planting, and the underground water level is lower than 4m; the raspberry is suitable for being planted on a sunny slope in a shallow mountainous area in a mountainous region; (5), holes are dug on ridges when rainfall is plentiful according to precipitation of the local area, the density can be properly reduced when the soil is fertile, and the density is property increased when the soil is infertile.

The invention provides a mulberry fruit wine fermented by saccharomycopsis fibuligera and a preparation method of the mulberry fruit wine. The preparation method comprises the following steps of mixing the saccharomycopsis fibuligera with sucrose with the same mass, then adding water, performing uniform stirring, and performing standing and activation to obtain a saccharomycopsis fibuligera seed solution; cleaning mulberries, soaking the cleaned mulberries with clear water, performing draining, performing pulping, adding sterile water, regulating sugar degree and acidity, and finally adding potassium metabisulfite to obtain a to-be-fermented solution; under a sterile condition, inoculating the to-be-fermented solution with the saccharomycopsis fibuligera seed solution, performing uniform mixing, and performing fermenting to obtain a fruit wine fermentation solution; separating peel-residue separation on the fruit wine fermentation solution, performing ageing, and then sequentially performing filtering, sub-packaging, sterilizing and ageing to obtain the mulberry fruit wine fermented by the saccharomycopsis fibuligera. The invention further discloses the mulberry fruit wine preparedby adopting the preparation method. The preparation process is simple in flow, the mulberry fruit wine can be rapidly prepared, the problems that in the prior art, nutritional ingredients are prone to lose and the fruit wine quality is poor are effectively solved, and market popularization of the mulberry fruit wine is facilitated.

The invention provides an indoor cement pond artificial fry breeding method for porcupine pufferfish. The method comprises the following steps: fry breeding pond preparation, newly hatched fry pond entry, bait feeding strategy in fry breeding period, water quality management in the fry breeding period, fry pond division, fry emergence and the like. Compared with the prior art, the method has the advantages that the water quality and environmental conditions of a nursery pond are strictly controlled, and scientific and reasonable feeding and operation management are performed in different fry breeding stages according to the biological characteristics and nutritional requirements of the porcupine pufferfish, so that large-scale production of artificial fry breeding of the porcupine pufferfish is realized.

The invention discloses an Adam begonia cutting and seedling raising substrate. The Adam begonia cutting and seedling raising substrate is prepared from the following matters of wormcast, plant stones, akadama soil, river sand, plant straws, coal slag and a composite additive. The Adam begonia cutting and seedling raising substrate is paved in two layers; through reasonable combination of all the components and careful control on particle size, the Adam begonia cutting and seedling raising substrate has the characteristics that the density is moderate, the permeability is strong, and the water retention and fertilizer conservation performance is good; a good growth environment is provided for the growth of cuttings; the nutritional component of the Adam begonia cutting and seedling raising substrate is rich, the requirements of the cuttings on nutrition during an early growth period can be met, and the growth speed of the cuttings is ensured; through gleditsia sinensis water in the added composite additive, a substrate environment can be purified, the morbidity of the cuttings is reduced, and the survival rate of the cuttings is increased; according to the Adam begonia cutting and seedling raising substrate disclosed by the invention, the components are easy to obtain, the preparing is convenient, the cost is low, the seedling raising effect is good, large-scale and commercial production requirements of cutting seedlings of Adam begonia can be met, and good promotion value is obtained.

The invention discloses a feeding device for chicken mixed breeding and a breeding method thereof. A feed barrel of the feeding device is provided with an electromagnetic feed valve, a timer and an indicating lamp, which can guide the chicken group to eat regularly. According to the feeding device, the feed can be automatically added, and stratified feeding of big and small chickens is achieved, thereby reducing the labor of workers. The feeding device also has a function of automatically adding water, so that drinking water of the chicken group every time is fresh, and the health of the chicken group is ensured. The modes of forest stocking and polyculture of big and small chickens are adopted by the breeding method of chicken mixed breeding, the activity space of the chicken group is large, the chicken group is in a good mood due to the mode of leading the small chickens by the big chickens, and the meat quality of the chickens is fresh. According to the breeding method, the heightsof a feed tray, annular water tank trays and a standing ring are adjusted at different growth stages of the chickens so as to control the feeding height and water drinking height of the chickens, andthe big chickens can spontaneously jump to the standing ring for feeding and drinking water, thereby achieving the purpose of increasing the amount of activity.

The invention provides a crystal growth assembly for preparing single crystals through a PVT method. The crystal growth assembly comprises a crucible and a heating device located above the crucible. The heating device is provided with a plurality of concentrically arranged annular heating temperature zones, so that the axial temperature gradient in the crucible is adjusted by controlling the overall heating temperature of the plurality of concentrically arranged annular heating temperature zones in the heating and / or crystal growth stage of single crystal preparation; and the radial temperature gradient in the crucible is adjusted by controlling the heating temperature of each annular heating temperature zone in the plurality of concentrically arranged annular heating temperature zones. According to the device for preparing the silicon carbide single crystal, the axial temperature gradient and the radial temperature gradient of the temperature field in the crucible can be controlled, so that the growth rate of the crystal is increased, the stable growth environment of the crystal is ensured, a relatively large crystal edge diameter gradient is maintained, the edge quality is improved, and meanwhile, the silicon carbide single crystal with a relatively large size is obtained.

The invention relates to a low-cost and easy-to-eat mullet compound feed and further relates to a manufacturing method of the low-cost and easy-to-eat mullet compound feed. The low-cost and easy-to-eat mullet compound feed comprises, by mass, 10-20 parts of pure squid powder, 10-20 parts of bean pulp, 10-20 parts of cottonseed meal, 8-16 parts of wheat bran, 8-14 parts rice bran, 8-14 parts of dried potato powder, 6-10 parts of dried earthworm powder, 6-12 parts of caloglossa, 4-6 parts of pea meal, 4-6 parts of dried hawthorn powder, 4-6 parts of shepherd's purse, 3-5 parts of cordate houttuynia, 3-5 parts of selfheal, 2-4 parts of honeysuckle, 2-4 parts of Physalis angulata L., 2-4 parts of Indian kalimeris herb, 1-3 parts of Polygonum orientale L. Sp, 1-3 parts of spina date seeds, 1-3 parts of tape grass, 1-3 parts of garlic and the like. The low-cost and easy-to-eat mullet compound feed is low in cost, the raw materials are environmentally friendly, and mullets like to eat the low-cost and easy-to-eat mullet compound feed.

The invention discloses a poultry feed. The poultry feed is prepared from the following components in parts by weight: 1-3 parts of corn flour, 7-10 parts of soybean meal, 25-40 parts of wheat bran, 1.5-2 parts of a premix, 15-25 parts of insect powder, and 20-35 parts of grass powder. The poultry feed adopts the insect powder and the grass powder as the main components, and reduces the content of corn, the soybean meal, the wheat bran and other high-energy high-protein raw material components in a traditional feed; and under a condition of ensuring large-scale poultry breeding, the poultry feed maintains the growth speed of poultry, significantly improves the meat material amount, effectively controls the disease incidence of poultry products, at the same time, greatly reduces the drug residual amount of the poultry products, and improves the health quality of the poultry products.

The invention relates to a precise combined feeding method for regulating water quality in aquaculture, and belongs to the technical field of the aquaculture. The precise combined feeding method for regulating the water quality in the aquaculture includes steps: using high and low protein feed in mixing mode during the whole aquaculture process, regulating a carbon-nitrogen ratio in the medium period of the aquaculture, and regulating the water quality in the later period of the aquaculture. By using the precise combined feeding method for regulating the water quality in the aquaculture, the water quality can be regulated well, bacilli and lactic acid bacteria in a water body become dominant bacteria, fishes can grow well and quickly by throwing the feed in the later period of the aquaculture, a culture cycle is shortened, yields and efficiency are increased, and a feed coefficient is reduced.

The invention discloses a method for preparing a functional feed additive through biological glycolysis of enteromorpha. The method comprises the main steps of performing pretreatment, performing high-concentration enteromorpha liquid transformation and synergistic glycolysis, and preparing the functional feed additive. According to the method disclosed by the invention, the extraction of nutritive substances and functional factors of enteromorpha, and the biological transformation of active functional components are realized, so that the enteromorpha functional feed additive is prepraed. The method disclosed by the invention is simple, convenient and easy in technology and high in production efficiency, in the raising process, the ingestion digestibility of aquaculture animals of trepangs, abalones, prawns, fish and the like can be effectively increased, the breeding cycle can be shortened, and economic benefits are increased.

The invention relates to a seed crystal shaft and a method for liquid phase growth of silicon carbide, and belongs to the technical field of silicon carbide growth. The seed crystal shaft provided by the invention comprises a graphite shaft; the lower end of the graphite shaft is connected with a graphite shaft cap; the graphite shaft cap is of a hollow structure. According to the seed crystal shaft and the method for the liquid phase growth of the silicon carbide, the problems of polytypes, inclusions and stress caused by high-speed growth of a conventional method are solved; the temperature gradient can be regulated and controlled conveniently, so that the growth speed of a crystal is ensured, and meanwhile, the quality of the crystal can also be ensured.

The invention discloses a silicon carbide single crystal, a substrate and a preparation method thereof, which belongs to the field of semiconductor materials. The preparation method of the silicon carbide single crystal comprises the following steps: forming a low-temperature region and a high-temperature region in a crucible by virtue of a temperature measuring hole formed in an upper thermal insulation layer group outside the crucible, and transmitting a raw material gas phase in the low-temperature region to the surface of a seed crystal in the high-temperature region by virtue of a physical gas phase transmission method to grow the crystal; wherein the upper heat preservation layer set comprises a second heat preservation layer and a first heat preservation layer which are sequentiallyarranged in the seed crystal direction of raw materials. The first heat preservation layer is provided with a first opening, the second heat preservation layer is provided with a second opening, anda rotary adjusting mechanism rotates the first heat preservation layer and / or the second heat preservation layer to adjust the cross sectional area of a temperature measuring hole formed by the firstopening and the second opening, so that the axial and radial temperature gradient in the crucible in the crystal growth process is adjusted. According to the preparation method of the silicon carbidesingle crystal, the radial temperature gradient in a growth cavity for growing the single crystal can be adjusted; and while the radial temperature gradient is reduced, a certain axial temperature gradient is ensured, and the high-quality silicon carbide single crystal is efficiently prepared.

The invention belongs to the technical field of tree planting, particularly relates to a zanthoxylum bungeanum tree planting method and provides an improved zanthoxylum bungeanum tree planting method. The zanthoxylum bungeanum tree planting method comprises steps as follows: (1), land preparation and ridging: leeward, sunward and fertile sandy loam with thick soil layer and good drainage performance is selected during seedling culture; (2), seed treatment: zanthoxylum bungeanum seed cases are hard and are oily and waxy, moisture cannot permeate into seeds easily, and the seeds are more difficult to germinate, so that degreasing treatment is required; (3), land preparation and sowing: a black sand land is selected in the time from October to the time before freezing and is irrigated, and base fertilizer containing equal content of nitrogen, phosphorus and potassium is applied in two days; (4), seedling culture: seedlings germinate in May and June of the next year, after germination, the seedlings are watered when one cun tall, the temperature keeps in a range of 15-25 DEG C, and the seedlings are watered once each month; (5), planting: planting is the key, the transplanting survival rate is the highest when buds just germinate, topdressing is performed for 2-3 times in the growth season, and topdressing and watering are combined in case of drought.