35results about How to "Restricted use" patented technology

The invention discloses a binder-free polycrystalline cubic boron nitride abrasive and a preparation method thereof. The preparation method of the abrasive comprises the following steps: 1, adding hexagonal boron nitride powder into a die, and carrying out molding preformation; 2, carrying out cold isostatic pressing treatment on the above preformed product under vacuum conditions; 3, adding the above obtained hexagonal boron nitride block into a tantalum cup in order to form an assembled block together with a pressure transmitting medium; and 4, carrying out high temperature high pressure synthesis treatment on the assembled block, carrying out furnace cooling, demolding, crushing, and grading to prepare the abrasive. The binder-free polycrystalline cubic boron nitride abrasive has the ultrafine crystal structure of submicron dimension cBN monocrystal, and the micro-fragmentation self-sharpening effect and the isotropy of the binder-free polycrystalline cubic boron nitride abrasive overcome passivation, cleavage, anisotropy and other defects of monocrystalline cBN abrasives; and the binder-free polycrystalline cubic boron nitride abrasive disclosed in the invention has high hardness and strength, is suitable for high precision processing of high hardness quenched steel, especially electrical, electronic and optical devices, has very high social values and economic benefit, and is suitable for popularization and application.

The invention discloses a wind bell type friction nano-generator and a manufacturing method thereof, which belong to the technical field of self-energy supply. The wind bell type friction nano-generator includes a packaging chamber and a swing unit arranged in the packaging chamber. The packaging chamber is provided with an air vent thereon and an electrode therein. The electrode includes electrode layers oppositely arranged on the two inner surfaces of the packaging chamber. The swing unit includes a swing film and a friction film. One end of the swing film is connected with the top of the packaging chamber, and the other end is connected with the friction film to drive the friction film to swing. The friction film can contact the electrode layer during swing. The weak wind energy in theenvironment or the micro energy of human respiratory airflow can be fully converted into electrical signals and output, and the problem that the existing friction nano-generator is limited in usage scenario and cannot collect small wind energy is solved.

The invention discloses a universal molecular marker primer for trees and a joint development method and application thereof, wherein the joint development method of three molecular markers is adopted, the limitations of single molecular markers such as the inter-species conservation of the SSR sequences on the two sides is relatively low are circumvented, this greatly limits the use of SSR markers in other species, the ILP markers and IP exist only in the chromosomal gene segment, for other non-coding intervals the method cannot be used, the joint use of multiple molecular marker method combines the advantages of each marker, the result is more objective; the general molecular marker primers SSR, ILP and PIP for trees obtained using the method hereof provide a solution for the problems that currently the molecular markers for trees are relatively few, the universality of the markers is relatively low, and the tree species are difficult to distinguish, and the method is capable of improving the accuracy of the identification results of tree species.

The invention discloses a surface treatment method for water-corrosion-resistant refractory metal molybdenum. The method includes the steps that molybdenum powder is prepared, press forming is carriedout, sintering is carried out, heat machining and heat treatment are carried out, an experimental sample is prepared, and ion irradiation is carried out. The vacuum degree in a sample irradiation cavity is kept, Ar ions are adopted for irradiating the surface of the sample at a set temperature, the dosage is selected at 3-4*1016 ion / cm<2>, the acceleration voltage is selected at 350-400 KeV, theaverage atom displacement energy is selected at 25-35 eV, and a molybdenum block obtained after surface treatment is obtained. The corrosion resistance of the sample obtained before and after irradiation is evaluated through electrochemical open circuit potential, a polarization curve, impedance and other tests. The refractory metal molybdenum treated with the method has good corrosion resistance,and the burn-out life of the molybdenum in a water medium is greatly prolonged. By researching and analyzing the influences of the neutron irradiation effect on corrosion, scientific data are provided for application of the molybdenum and alloys thereof in the nuclear power field.

The invention discloses a liquid-phase sugar nano tellurium and a preparation method thereof. The liquid-phase sugar nano tellurium is a compound of sugar and nano tellurium obtained by reacting tellurite aqueous solution with the sugar by heating in the present of a reducing agent. The method comprises the following steps: adding the sugar to the tellurite solution, adding the reducing agent which is 50-100 times of the molar weight of the tellurite, and heating for reacting to obtain a product. The method is simple and feasible, and is applicable to industrialized production. The obtained product is more stable at normal temperature, thus realizing the storage of a nano tellurium elementary substance in a liquid phase, greatly widening the application range of the existing solid nano tellurium and reducing the use restriction thereof.

The invention provides a non-wood fiber biologic chemimechanical pulp production process for producing fulvic acid fertilizer by using pulp black liquor. The production process comprises the steps that non-wood fiber is taken as raw material, biologic chemimechanical pulp is adopted for pulping process, fulvic acid is extracted in multiple working procedures in the pulping process of chemimechanical pulp, the pulp black liquor is extracted, the black liquor rich in the fulvic acid component is collected, a secondary extraction is carried out, and the fulvic acid is obtained. The existing production of fulvic acid fertilizer by using pulp black liquor only involves the use of chemical pulping black liquor to produce fulvic acid fertilizer, but does not involve the use of chemimechanical pulp process to produce fulvic acid in pulp black liquor, thereby greatly limiting the non-wood fiber chemimechanical pulp with the utilization of straw resources and the development of resources, and beneficial development and breakthrough are required in both aspects of technology and practice. The non-wood fiber biologic chemimechanical pulp production process for producing fulvic acid fertilizerby using pulp black liquor has the advantages that the steps are simple, the operation is convenient, the practicability is strong, and the economic, ecological and social value is high.

The invention discloses a method for preparing a lithium-iron manganese phosphate positive electrode material by employing ethyl cellulose as a carbon source. The method comprises the following steps of (1) weighing a manganese source compound, an iron source compound and a phosphorus source compound and then dissolving the manganese source compound, the iron source compound, the phosphorus source compound and a reducing agent into a solvent I to obtain a solution A, dissolving a lithium source into a solvent II to obtain a solution B, dropwise adding the solution B to a precursor solution of lithium manganese phosphate and putting the solution in a high-temperature and high-pressure reaction kettle for reaction for 1-20 hours to prepare a lithium-iron manganese phosphate precursor material; (2) carrying out ball-mill mixing on the precursor material obtained in the step (1) and the ethyl cellulose at the mass ratio of (1-30):1 to obtain a mixture; and (3) drying the mixture, then putting the mixture into a tube furnace for sintering and finally obtaining the carbon-coated lithium-iron manganese phosphate positive electrode material. The thickness of a carbon film on the surface of the positive electrode material obtained by the method is small, so that the electrochemical properties of the material are significantly improved.

The invention discloses a preparation method of a multi-layer circuit board for 5G communication and the multi-layer circuit board. The preparation method comprises the steps that a substrate is provided, a flow guide channel used for circulating a cooling medium is formed in the substrate, a first circuit layer and a second circuit layer are arranged on the top surface and the bottom surface of the substrate respectively, a plurality of through holes are drilled in the first circuit layer, the through holes sequentially penetrate through the first circuit layer, the substrate and the second circuit layer, the through holes are communicated with the flow guide channel, heat conduction columns are arranged in the through holes in a sealed mode so as to enable the first circuit layer and thesecond circuit layer to be electrically connected, the heat conduction columns make contact with cooling media in the flow guide channels, the flow guide channels of all the substrates of the multilayer circuit board are connected with the condensation unit through inlets and outlets to form cooling flow paths for the cooling media to flow, a first electronic component is arranged and a first solder mask layer is adhered at at least one first heat conduction column on the top surface of the multilayer circuit board, and a second electronic component is arranged and a second solder mask layeris adhered at a second heat conduction column, different from the first heat conduction column, on the bottom surface of the multilayer circuit board.

The invention relates to a multi-element co-doped visible-light-induced photocatalyst, which comprises the following steps: 1) preparing a titanium dioxide nanotube array; 2) preparing N-doped titanium dioxide nanotubes; 3) preparing C and N co-doped nitrogen-modified titanium dioxide nanotubes; and 4) preparing ferric oxide and carbon nitride co-doped nitrogen-modified titanium dioxide nanotubes.The photocatalyst has the functions of visible light excitation and catalytic degradation of organic pollutants, and also has the functions of easy separation from water and easy recovery.

The invention discloses an enterprise information analysis management system, which comprises a server, a classification storage module, a login module, an information classification subsystem, a background management subsystem and an information analysis subsystem, wherein the information analysis subsystem analyzes the information data of the enterprise, and transmits the analyzed data information to the information classification subsystem for classification and sorting. The invention is novel in design, simple in principle, easy to use; the information classification subsystem can carry onthe classification planning to the enterprise data information, store files with high similarities together, In this way, it can be convenient to access and read at any time, ensure the collation ofdata, avoid the problem that the data information is cluttered and difficult to find, set up the authority setting module, set different authorities according to different crowds, limit the use degreeof each person, facilitate the management, increase the security protection, and avoid the leakage of enterprise technology or privacy documents.

The invention belongs to the technical field of industrial kiln energy saving and discloses a double-circular-truncated-cone black body radiation energy saving element and preparation and applicationmethods thereof. The element comprises a bottom plate. A first hollow circular truncated cone and a second hollow circular truncated cone with top openings are arranged at the top of the bottom plate.The second circular truncated cone is located inside the first hollow circular truncated cone and coaxial with the first hollow circular truncated cone. A gap is reserved between the first hollow circular truncated cone and the second hollow circular truncated cone. The first circular truncated cone and the second circular truncated cone are made of refractory black body materials. The structureof the double-circular-truncated-cone black body radiation energy-saving element is proposed according to a satisfactory black body model principle and does not rely on the effect of a surface coating, the phenomena that the blackness of the black body element is decreased, and the radiation heat flow is reduced due to coating ageing are avoided, and the service life of the black body element is prolonged; and by means of the structural design of the double-circular-truncated-cone black body radiation energy-saving element, the heating furnace hearth radiation heat exchanging area is greatly increased and is approximately 1.5 times that of an ordinary black body element.

The invention discloses a composite photocatalytic material with efficient photocatalytic activity and a preparation method thereof. The composite photocatalytic material comprises modified nitrogen carbide, a first catalytic material, a second catalytic material, carbon fibers, and sodium phosphate. The modified nitrogen carbide is prepared through a precursor self-assembly co-polymerization modification method; and melamine and trithiocyanuric acid are adopted as raw materials. The first catalytic material is an Ag / Ag3PO4 / BiPO4 composite material, the second catalytic material is of a CdS micro-sphere@TiO2 core-shell structure, the first catalytic material and the second catalytic material have excellent photocatalytic activity and visible light utilization rate, and then the first catalytic material, the second catalytic material and modified nitrogen carbide are compounded; the photocatalytic material is prepared by compounding the first catalytic material, the second catalytic material and the modified nitrogen carbide, so that the visible light utilization rate of the photocatalytic material is effectively improved, and the photocatalytic material is excellent in reaction activity and photocatalytic reaction efficiency and has relatively high practicability.

The invention relates to a movable dance mirror for dance rehearsal, which belongs to the technical field of dance training instruments, and comprises a plurality of combined mirror units arranged in a line, and a plurality of connecting components respectively and correspondingly arranged between the adjacent combined mirror units and used for realizing the connection of the plurality of combined mirror units; a plurality of dancing mirrors can be quickly combined and connected through connecting pipes and connecting grooves, the situation that the usability of the dancing mirrors is limited by sites and the number of people is avoided, and the flexibility of the dancing mirrors is improved; the dance mirror can be flexibly moved through guide wheels at the bottoms of the connecting pipes, and connecting screws not only fix adjacent bases, but also can fix the guide wheels; and the dance mirror is easy to operate, high in practicability and worthy of popularization.

The invention relates to a digital key authorization method, which comprises the steps that an authorized user encrypts authorization information and uploads the authorization information to a cloud platform, wherein the authorization information comprises vehicle information and authorized person identity information; the cloud platform decrypts the authorization information sent by the authorized user, establishes a contact between the authorizer and the authorized person, and stores the authorization information in the cloud platform; the cloud platform issues inquiry information to a user terminal of the authorized person, and if the authorized person accepts authorization, user terminal equipment information of the authorized person is encrypted and uploaded to the cloud platform; and the cloud platform decrypts the user terminal equipment information sent by the authorized person, generates a digital key and issues the digital key to the user terminal of the authorized person. Compared with the prior art, the method has the advantages that bicycle borrowing operation can be conveniently and quickly performed through digital key authorization, authority information, use dates and use times are limited, risks and troubles of bicycle borrowing are well solved, the problem of key returning is avoided, and user experience is good.

The invention discloses a management system for monitoring a shared bicycle parking situation, comprising a slot, a plug-in piece, an accommodating cavity, an infrared correlation detector, a management module, a controller. The slot is arranged at a handle on the right side of a shared bicycle; the plug-in piece is arranged on the end portion of the handle on the right of the shared bicycle; theinfrared correlation detector is used for sending a detection signal in the case that an infrared receiver cannot receive an infrared signal sent out by an infrared generator; the controller is used for sending a notification message to a smart phone; the management module is used for finishing the transaction after receiving the notification message and controlling a sound player to send a promptvoice if the controller has received a locked signal of a locking structure but does not receive a detection signal of the infrared receiver; and the controller is used for controlling an LED illuminating module to illuminate in the case that the detection signal of the infrared receiver is not received. The management system for monitoring a shared bicycle parking situation can limit the behavior of a user using the shared bicycle, thereby realizing the management of orderly parking of the shared bicycles.

The invention discloses an active lubricating structure of a differential mechanism with a differential lock, which comprises a gearbox shell, a differential mechanism bearing support, a first shaft hole arranged on the differential mechanism bearing support, a differential mechanism bearing and a differential mechanism, the differential mechanism comprises a differential mechanism shell with second shaft holes formed in the two ends, a half axle gear, a planetary gear assembly, a differential lock assembly and a sun wheel shaft. A shell oil duct is arranged on the gearbox shell, bearing support oil ducts are arranged on the differential bearing supports, and outlets of the bearing support oil ducts are connected with the first oil cavity. An annular gap between the sun wheel shaft and the second shaft hole forms a differential oil duct which is connected with the interior of the first oil cavity. A half axle gear oil duct is arranged on the half axle gear, a bearing oil duct is arranged on the differential mechanism shell, and a differential lock oil duct is arranged on the differential mechanism shell. By arranging the lubricating oil channels, active lubrication of all assemblies of the differential mechanism is achieved, and the technical problems that in the prior art, passive splash lubrication is adopted, lubrication is insufficient, and early abrasion is likely to be caused are solved.

The invention discloses a method and device for detecting the water vapor intrusion path of a packaging device. The method includes: performing water vapor trace marking on the packaged device to be tested based on a preset tracer, and obtaining a trace mark sample; performing a trace mark on the trace mark sample. Secondary ion mass spectrometry, to obtain the tracer intensity of the tracer-labeled sample; determine the path and speed of water vapor intrusion according to the tracer intensity. The invention combines the preset tracer with the secondary ion mass spectrometer to detect the water vapor intrusion path and speed of the packaged device, which is beneficial to improving the dynamic detection accuracy of water vapor intrusion and fundamentally improving the moisture-proof reliability of the packaged device.

The invention relates to a heating pipe positioning structure of a pipeline heater for an instant drinking water heating device. The heating pipe positioning structure of the pipeline heater for the instant drinking water heating device comprises the pipeline heater which comprises a water guide pipe and a heating pipe. The water guide pipe comprises a water inlet, a pipe cavity and a water outlet. The heating pipe is arranged in the pipe cavity of the water guide pipe. The heating pipe is used for heating water flowing through the pipe cavity of the water guide pipe, and the heating pipe is provided with a conductive end. The conductive end of the heating pipe extends out of the water guide pipe. A positioning block is arranged in the pipe cavity of the water guide pipe and used for clamping the heating pipe so that the heating pipe in the water guide pipe can be clamped and positioned in the water guide pipe by the positioning block. According to the heating pipe positioning structure, by simply arranging the positioning block at one end of the heating pipe into the water guide pipe, the end, in the pipe cavity, of the heating pipe is clamped and positioned in the water guide pipe by the positioning block, and the defects that the heating pipe swings in the pipe cavity and even impacts the pipe wall are overcome. In addition, the heating pipe positioning structure is simple and reasonable in structure and easy to implement, the end, in the pipe cavity, of the heating pipe is well protected, and the defects of deformation, damage, electric leakage and the like caused when the heating pipe impacts the pipe wall are overcome.

A method of making an ex-situ doped semiconductor transport layer for use in an electronic device includes: growing a first set of semiconductor nanoparticles having surface organic ligands in a colloidal solution; growing a second set of dopant material nanoparticles having surface organic ligands in a colloidal solution; depositing a mixture of the first set of semiconductor nanoparticles and the second set of dopant material nanoparticles on a surface, wherein there are more semiconductor nanoparticles than dopant material nanoparticles; performing a first anneal of the deposited mixture of nanoparticles so that the organic ligands boil off the surfaces of the first and second set of nanoparticles; performing a second anneal of the deposited mixture so that the semiconductor nanoparticles fuse to form a continuous semiconductor layer and the dopant material atoms diffuse out from the dopant material nanoparticles and into the continuous semiconductor layer.

The invention discloses an ultrahigh-capacity zinc-cobalt battery positive electrode and a self-activation preparation method thereof, and belongs to the technical field of zinc-cobalt batteries, the ultrahigh-capacity zinc-cobalt battery positive electrode has a two-stage ultrafine nanosheet structure, the length of a first-stage nanosheet is 10 [mu] m, and the thickness of a second-stage ultrafine nanosheet is 1.7-6 nm; the zinc-cobalt battery positive electrode is used in a zinc-cobalt battery, and the discharge capacity of the battery can reach 402.5-482.2 mAh / g. According to the ultrahigh-capacity zinc-cobalt battery positive electrode disclosed by the invention, a secondary superfine nanosheet structure creates an ultrahigh specific surface with a large number of active sites and a porous structure which is beneficial to material and electron transmission and electrolyte permeation, the electron transfer capability in the charge-discharge process is enhanced, and the discharge capacity can reach 482.2 mAh / g when the battery positive electrode is used in a zinc-cobalt battery.

An information management device (1A) sets in information, first control information which permits use of information in a terminal of a transmission destination which does not permit information transfer and sets in information, second control information which permits transfer for a transmission destination terminal which permits information transfer. Moreover, upon reception of information containing the first control information from a transmission source terminal, the information management device (1A) performs control to permit use of display of the information in the local device. Upon reception of information containing the second control information from a transmission source terminal, the information management device (1A) performs control to permit transfer of the information.

There is provided a disk / disk drive management system that is capable of setting limits to reproduction of a disk and a disk drive used for the disk reproduction, for example, setting limits to reproduction of a rental disk to prevent unrestricted copying. On a first storage region of a disk having optical information written thereto and a second storage region of the disk having an electronic circuit 11 mounted thereon, a plurality of arbitrary codes (A001 to A999) assigned uniquely to the disk are stored. When the disk is loaded into a disk drive 1, the plurality of codes are read in and written to a code memory 114 of the electronic circuit 11, and an unused code of the plurality of codes is written to a memory 14 provided in the disk drive 1 and / or to a management memory 115 provided on the electronic circuit 11. The disk drive information that was used or is being used, user information, and other information can also be written to the management memory 115. The reproduction of the disk, and the disk drive used for the disk reproduction, are controlled based on the information written to the memory 14 or management memory 115.

There is provided a disk / disk drive management system that is capable of setting limits to reproduction of a disk and a disk drive used for the disk reproduction, for example, setting limits to reproduction of a rental disk to prevent unrestricted copying. On a first storage region of a disk having optical information written thereto and a second storage region of the disk having an electronic circuit 11 mounted thereon, a plurality of arbitrary codes (A001 to A999) assigned uniquely to the disk are stored. When the disk is loaded into a disk drive 1, the plurality of codes are read in and written to a code memory 114 of the electronic circuit 11, and an unused code of the plurality of codes is written to a memory 14 provided in the disk drive 1 and / or to a management memory 115 provided on the electronic circuit 11. The disk drive information that was used or is being used, user information, and other information can also be written to the management memory 115. The reproduction of the disk, and the disk drive used for the disk reproduction, are controlled based on the information written to the memory 14 or management memory 115.

The invention discloses a water corrosion-resistant refractory metal molybdenum surface treatment method, which includes preparing molybdenum powder, pressing and forming, sintering, thermal processing and heat treatment, preparing experimental samples and ion irradiation, and adopting the method of maintaining the vacuum degree in the sample irradiation cavity , the surface of the sample is irradiated with Ar ions at a set temperature, and the selected dose is 3‑4*10 16 ion / cm 2 , the acceleration voltage is 350-400KeV, the average atomic dislocation energy is 25-35eV, and the surface-treated molybdenum block is obtained. The corrosion resistance of the samples before and after irradiation was evaluated by electrochemical open circuit potential, polarization curve and impedance tests. The refractory metal molybdenum treated by the method has good corrosion resistance and greatly improves the failure life of the molybdenum in the water medium. By studying and analyzing the effect of neutron irradiation on corrosion, scientific data are provided for the application of molybdenum and its alloys in the field of nuclear power.

The invention discloses a surface alloying method for improving the water corrosion resistance of refractory metal molybdenum. The method comprises the following steps of preparing an experimental sample and performing ion irradiation, preparing an irradiation experimental sample by a powder metallurgy method, putting the sample into an irradiation cavity with high vacuum degree, irradiating the surface of the sample by Nb ions at 30-100 DEG C, selecting the dosage of 2-4 * 10<16>ion / cm < 2 >, the acceleration voltage of 300-400 KeV, and the average atom dislocation energy of 25-35 eV, and obtaining a surface-alloyed molybdenum sample; and carrying out XRD, microhardness, electrochemical potentiodynamic polarization and impedance test on the surface-alloyed sample, and detecting and evaluating the phase, mechanical properties and corrosion resistance of the sample before and after irradiation. The refractory metal molybdenum treated through the method has good corrosion resistance, the failure life of molybdenum in a high-temperature water medium is greatly prolonged, and scientific guiding significance is provided for application of molybdenum and alloy of molybdenum in the nuclear power field.

For a destination terminal not permitted to forward information, an information management apparatus (1A) sets first control information for permitting use of information within the terminal to the information. For a destination terminal permitted to forward the information, the information management apparatus (1A) sets second control information for permitting forwarding of the information to the information. The information management apparatus (1A) controls to permit local use of the information on the apparatus when the information set with the first control information is received from a source terminal, and controls to permit forwarding of the information when the information set with the second control information is received from a source terminal.

The invention discloses a method for preparing a lithium-iron manganese phosphate positive electrode material by employing ethyl cellulose as a carbon source. The method comprises the following steps of (1) weighing a manganese source compound, an iron source compound and a phosphorus source compound and then dissolving the manganese source compound, the iron source compound, the phosphorus source compound and a reducing agent into a solvent I to obtain a solution A, dissolving a lithium source into a solvent II to obtain a solution B, dropwise adding the solution B to a precursor solution of lithium manganese phosphate and putting the solution in a high-temperature and high-pressure reaction kettle for reaction for 1-20 hours to prepare a lithium-iron manganese phosphate precursor material; (2) carrying out ball-mill mixing on the precursor material obtained in the step (1) and the ethyl cellulose at the mass ratio of (1-30):1 to obtain a mixture; and (3) drying the mixture, then putting the mixture into a tube furnace for sintering and finally obtaining the carbon-coated lithium-iron manganese phosphate positive electrode material. The thickness of a carbon film on the surface of the positive electrode material obtained by the method is small, so that the electrochemical properties of the material are significantly improved.

The invention discloses a general molecular marker primer for trees and its joint development method and application. The invention adopts the joint development method of three molecular markers, which avoids the limitation of a single molecular marker, such as the sequence species on both sides of the SSR sequence. The low conservation between SSR markers greatly limits the utilization of SSR markers in other species. ILP markers and IP are only present in chromosome gene segments, and this method cannot be used for other non-coding regions. The combined use of multiple molecular marker methods Combining the advantages of each marker, the result is more objective; the SSR, ILP and PIP universal molecular marker primers of trees obtained by the method of the present invention not only overcome the lack of molecular markers in trees, the lower versatility of markers, and the lack of tree species. It is difficult to distinguish the problem, and it can also improve the accuracy of tree species identification results.

The invention provides a non-wood fiber biochemical mechanical pulp production process using pulping black liquor to produce fulvic acid fertilizer. The multi-stage process of the process is to extract the fulvic acid, extract the pulping black liquor, collect the black liquor rich in fulvic acid, and extract it twice to obtain it. The existing use of pulping black liquor to produce fulvic acid fertilizer only involves the use of chemical pulping black liquor to produce fulvic acid fertilizer and does not involve the use of chemical pulping technology to produce fulvic acid from pulping black liquor, which greatly limits The utilization and development of straw resources by non-wood fiberized mechanical pulp requires beneficial development and breakthroughs in both technology and practice. The steps are simple, the operation is convenient, the practicability is strong, and the economic, ecological and social value is high.