83results about How to "Convenient shuttle" patented technology

The invention provides a preparation method for a three-dimensional carbon nanotube / nitrogen-doped graphene / sulfur electrode slice. The preparation method comprises the following steps of (1) adding the carbon nanotube, graphite oxide and polyacrylonitrile to N-methyl pyrrolidone, performing an ultrasonic reaction, coating an aluminium foil with mixed paste, and performing vacuum drying to obtain the electrode slice; (2) putting the obtained electrode slice into a muffle furnace under ammonia gas protection, heating to 400-500 DEG C, and naturally cooling; and (3) enabling the electrode slice obtained in the step (2) to be fully inserted into a Na2S2O3 solution, and slowly adding hydrochloric acid to the solution in a dropwise manner until the PH value of the solution reaches 6.5-7.5, taking out the electrode slice, and drying the electrode slice to obtain a positive plate. The electrode slice prepared by the invention can be directly used for the positive electrode of a lithium-sulfur battery without requiring a conductive agent and a binder, so that the cost of the electrode is greatly lowered.

The invention provides a preparation method for a boron-nitrogen-co-doped three-dimensional structured positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of (1), adding graphite oxide into water for performing ultrasonic processing to form a graphene oxide suspension liquid; (2), adding ammonium hydroxide to the graphene oxide suspension liquid, and then adding sodium borohydride to the graphene oxide suspension liquid to obtain three-dimensional boron-nitrogen-co-doped graphene; (3), adding the three-dimensional boron-nitrogen-co-doped graphene obtained in the step (2) and ketjen black into N-methyl pyrrolidone for performing an ultrasonic reaction to form a suspension liquid; (4), adding sulfur to the N-methyl pyrrolidone for performing an ultrasonic reaction until the elemental sulfur is fully dissolved to form a suspension liquid; and (5), mixing the two kinds of suspension liquid obtained in the step (4) and the step (3), and then adding distilled water to obtain the three-dimensional structured positive electrode material of the lithium-sulfur battery. Due to sulfur adsorption by the synergistic effects of boron atoms and nitrogen atoms in the boron-nitrogen-co-doped graphene, the shuttle effect is lowered, so that the cycling life of the lithium-sulfur battery is prolonged.

The invention discloses a dynamic dehumidification device for drying plastic particles, and belongs to the technical field of plastic particle processing. Moisture on the plastic particles is absorbedand dried through magnetic dehumidification balls, and before the magnetic dehumidification balls absorb the moisture, magnet layers can magnetically absorb hollow magnetic balls, and after the magnetic dehumidification balls absorb the moisture to a certain degree, outer moisture absorption expansion layers absorb water and expands to extrude inner elastic magnetic shielding layers, inner elastic magnetic shielding layers are extruded to be tightly attached to the hollow magnetic balls, so that a certain magnetic shielding effect on the hollow magnetic balls is achieved; and the magnetic dehumidification balls are reset inwards under the action of extension springs, and after a drying part is dried and the outer moisture absorption expansion layers lose water, the inner elastic magneticshielding layers expand outwards to weaken the shielding effect on the hollow magnetic balls, when the magnetic attraction force of the magnet layers to the hollow magnetic balls is larger than the tensile force of the extension springs, the magnetic dehumidification balls are pulled to move outwards, reciprocating dynamic movement is matched with a rotating dehumidification cylinder, and the gooddehumidification effect on the plastic particles is effectively achieved.

The invention provides a lithium-sulfur battery positive electrode material and a preparation method thereof. The lithium-sulfur battery positive electrode material comprises a porous carbon material for accommodating sulfur and a metal sulfide loaded on the outer layer of the porous carbon material, wherein sulfur in the porous carbon material containing the sulfur comprises elemental sulfur with multiple pore channels and liquid metal in the pore channels of the elemental sulfur. The elemental sulfur with the multiple pore channels is adopted, so that the expansion of the electrode material can be reduced, and the ion conduction can be enhanced. The contact resistance between the carbon material and the elemental sulfur is reduced by the liquid metal in the elemental sulfur with multiple channels, and the contact area between the elemental sulfur and the conductor is increased, so that a catalytic effect is achieved on the elemental sulfur to form the polysulfide. Metal sulfides outside of carbon materials are capable of absorbing S<2-> formed in the discharging process. Through the synergistic adsorption catalysis effect of the liquid metal in the elemental sulfur with the pore channels and the metal sulfides wrapping outside the sulfur-loaded porous carbon, the electrode material is enabled to have high energy density and high cycling stability.

The invention discloses a human abnormal posture detection system and method based on three-dimensional vision, and belongs to the technical field of computer vision. The technical problems to be solved by the invention is how to enlarge the fall detection range, effectively avoiding the blocking of the blocking object in the detection process, at that same time, how to detect the fall accurately.The adopted technical scheme is characterized in that a Kinect somatosensor is mounted on a mobile platform using a Mecanum wheel, so that the mobile platform equipped with the Kinect somatosensor can move with the human body; the kinect somatosensor is used to obtain the distance between the mobile platform and the human skeleton point, and the obtained distance change is converted into an electric signal to be sent to the mobile platform, so that the mobile platform can move with the moving direction and the moving speed of the human body, and the set distance between the mobile platform and the human body is ensured; at the same time, according to the image captured by the camera on the Kinect somatosensor, the human skeleton point information is obtained to establish the fall model and detect the fall of the human body.

The invention provides a preparation method for a three-dimensional nitrogen-doped positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of (1), adding graphite oxide into water for performing ultrasonic processing to form a graphene oxide suspension liquid; (2), adding ammonium hydroxide to the graphene oxide suspension liquid to obtain three-dimensional nitrogen-doped graphene; (3), adding the three-dimensional nitrogen-doped graphene obtained in the step (2) and ketjen black into N-methyl pyrrolidone for performing an ultrasonic reaction to form a suspension liquid; (4), adding ammonium hydroxide to the graphene oxide suspension liquid, and adding elemental sulfur to the N-methyl pyrrolidone for performing an ultrasonic reaction until the elemental sulfur is fully dissolved to form a suspension liquid; and (5), mixing the two kinds of suspension liquid obtained in the step (4) and the step (3), uniformly stirring, and slowly adding distilled water while stirring to obtain the three-dimensional structured positive electrode material of the lithium-sulfur battery. Due to sulfur adsorption by nitrogen atoms in the nitrogen-doped graphene, the shuttle flying effect can be effectively lowered, so that the cycling life of the lithium-sulfur battery is prolonged.

The invention provides an endoscopic liquid conveying pipe leakage and blockage ultrasonic detection device and method based on channel association. The device comprises soft fish-shaped inner detectors, an external passive sound label and an external active receiver. The soft fish-shaped inner detectors flow in a liquid conveying pipe along with liquid, and the pipe where the soft fish-shaped inner detectors flow through is detected through ultrasounds; and meanwhile, the external passive sound label with identity information is detected, and accurate positions of pipe defects are analyzed in cooperation with mileage recording. The external active receiver receives entrant sound signals transmitted by the soft fish-shaped inner detectors in the liquid conveying pipe on the outer side of the pipe, the passing time of the soft fish-shaped inner detectors is recorded, and the passing time of the multiple soft fish-shaped inner detectors can be combined to analyze which section of line is in blockage. By means of the method, each soft fish-shaped inner detector is provided with a plurality of ultrasonic receiving probes for full-directional receiving, and the multiple soft fish-shaped inner detectors conduct repeated detection, and the detection accuracy is high. The appearance of the soft fish-shaped inner detectors is in a fish shape, the size is small, the soft fish-shaped inner detectors are suitable for pipes with different pipe diameters, and use of an existing detector is not influenced.

The invention discloses a solid electrolyte, and belongs to the field of batteries. The solid electrolyte is provided with pore passages with a specific recognition function for conducting particles.Moreover, the invention discloses a preparation method of the solid electrolyte. The preparation method comprises the following steps: adopting a molecular imprinting technique to take polymer monomers and a lithium salt as functional monomers and the conducting particles as template molecules, adding an initiator and a cross-linking agent to be dissolved into a solvent for cross-linking polymerization so as to form a polymer network structure coated with the lithium salt and the conducting particles, then using an eluent to wash the conducting particles inside the polymer network structure, and after removing the solvent, forming the solid electrolyte provided with the pore passages with the specific recognition function for conducting particles. The invention also discloses a positive plate, a negative plate, an aluminum plastic film and an all-solid-state battery of the solid electrolyte. The solid electrolyte disclosed by the invention has high ionic conductivity, and is high in compatibility with a positive and negative interface and small in interface impedance, so that the electrical performance of the all-solid-state battery prepared by using the solid electrolyte is greatly improved.

The invention discloses a transition metal phosphide iron phosphide negative electrode material. The transition metal phosphide iron phosphide negative electrode material is prepared from the following steps that (1) water and N,N-dimethylformamide are mixed evenly; (2) an iron source and an organic ligand are added, stirring is conducted, and thus a mixed solution is formed; (3) sealing, heatingreaction, cooling, filtering, washing and drying are conducted to obtain yellow powder; (4) in inert atmosphere, roasting and cooling are conducted to obtain black powder; and (5) sodium hypophosphiteand the black powder are placed at the upstream part and the downstream part of a tubular furnace, in the inert atmosphere, roasting and cooling are conducted, and thus the transition metal phosphideiron phosphide negative electrode material is formed. The particle size of the negative electrode material is 400-600 nm, the transition metal phosphide iron phosphide negative electrode material isassembled into a battery, under the situation that the voltage is within the range of 0.1-3 V and the testing current is 100 mA.g<-1>, the first charge specific capacity reaches 1241 mAh.g<-1>, the first discharge specific capacity reaches 672 mAh.g<-1>, the capacity retention ratio after 100 cycles of circulating is greater than or equal to 95%, the preparation technique is simple in process, thereaction temperature is low, the cycle is short, and the cost is low.

The invention relates to an earthquake rescue robot which comprises a robot body, walking mechanisms and a control system. A cavity is formed in the robot body and is used for containing oxygen bottles, water and food needed in rescue. Multiple oxygen outlets are further formed in the top of the robot body and communicate with the oxygen bottle. The walking mechanisms are symmetrically installed on the two sides of the robot body. The control system comprises a signal receiving device, a camera shooting device, a life detection device, a CPU, a top cover driving motor, a foot driving motor, anoxygen bottle switch and a signal transmitting device. An earthquake rescue robot system is matched with the earthquake rescue robot to replace people to enter the ruins caused by the earthquake, oxygen, water and food are provided for trapped persons, and more rescue waiting time is provided for the trapped persons.

The invention relates to a method for preparing a positive electrode composite material. The method comprises the following steps: adding activated carbon subjected to acid treatment to graphene oxide suspension to obtain a mixed solution; and then adding a sodium ascorbate solution to obtain graphene hydrogel; and drying the graphene hydrogel, mixing and grinding the dry graphene hydrogel with sulfur, calcining the mixture at 150-200 DEG C for 3-15h in an argon atmosphere to obtain a graphene / activated carbon / sulfur positive electrode composite material. The method for preparing the positive electrode material of lithium-sulfur batteries provided by the invention has the advantages that the used raw materials are cheap and easy to obtain, the preparation process is simple, the flow is short, the process is easy to control, and the industrial production is easy to realize.

The invention discloses a high-conductivity flexible graphite / mesoporous graphitized carbon composite membrane electrode preparation method. The method comprises the following steps: graphene oxide and porous graphitized carbon are mixed and dispersed to prepare a uniformly-dispersed mixed dispersion liquid; the mixed dispersion liquid is subjected to vacuum filtration, and after drying, a graphene oxide / mesoporous graphitized carbon composite membrane is obtained; and the prepared graphene oxide / mesoporous graphitized carbon composite membrane is subjected to reduction treatment to obtain the above flexible electrode. The prepared composite membrane has excellent flexibility and high conductivity, the rate capability of a super capacitor is improved, and the performance of the super capacitor can be further improved.

The invention discloses a method for alcohol distillation and extraction on a fermented wine material. The method comprises the steps that a jacking mechanism drives a wine material loading mechanismto rise until a bottom wine material loading assembly is located in a main housing, rest wine material loading assemblies are located outside the main housing, and then wine materials are dumped to the inner part of the main housing; the jacking mechanism drives the wine material loading mechanism to fall until the wine material loading assembly which is the second from bottom to top is located inthe main housing, and the rest wine material loading assemblies above the wine material loading assembly are located outside the main housing; the wine material is dumped into the main housing, and the operations are reciprocated; high-temperature vapour flows to the inner part of the main housing, and alcohol steam is traced to flow to condensing equipment; after distillation is completed, the jacking mechanism drives the wine material loading mechanism to slowly rise, and personnel stir the waste wine material to the inner part of a discharging housing through tools of scoops and the like;and besides, discharging structural members are assisted for pushing the waste wine materials in the discharging housing to a discharging cylinder, and the waste wine materials are finally led by a cylinder housing to be discharged.

The invention provides a preparation method for a phosphorus-doped three-dimensional structured positive electrode material for a lithium-sulfur battery. The preparation method comprises the following steps of (1) adding graphite oxide into ethylene glycol, and performing ultrasonic processing to obtain a graphene oxide suspension liquid; (2) dissolving triphenylphosphine into ethylene glycol, and then adding the mixture into the graphene oxide suspension liquid; (3) adding the three-dimensional phosphorus-doped graphene obtained in the step (2) and ketjen black into N-methyl pyrrolidone, and performing an ultrasonic reaction to form a suspension liquid; (4) adding elemental sulfur into the N-methyl pyrrolidone, and performing ultrasonic processing until the elemental sulfur is fully dissolved to form a suspension liquid; and (5) mixing the two kinds of suspension liquid obtained in the steps (4) and (3), uniformly stirring, and slowly adding distilling water while stirring to obtain the three-dimensional structured positive electrode material for the lithium-sulfur battery. Due to the sulfur absorption effect of the phosphorus atoms in the phosphorus-doped graphene, the shuttle flying effect can be effectively reduced, and the cycling life of the lithium-sulfur battery can be prolonged.

The present invention provides amide-protected creatine molecules and compositions, containing one or more bioactive forms of creatine in aqueous compositions, wherein bioactive forms of creatine do not appreciably degrade into creatinine. Also provided are various beneficial effects of administering aqueous compositions having at least one amide-protected creatine molecule.

The present invention provides an electrode sheet and a manufacturing method thereof. The electrode sheet comprises a current collector layer and a slurry layer, wherein the slurry layer is coated on the current collector layer, small through holes are distributed on the current collector layer. The electrode sheet is characterized in that the small through holes are arranged into the column parallel to the edge of the current collector layer and the row perpendicular to the edge of the current collector layer, and the centers of the four small through holes distributed on different adjacent three rows and different adjacent three columns are connected to form an equilateral quadrangle. With the technical scheme of the present invention, the uniformity of the slurry on the current collector layer is increased, the active material can be automatically balance through the small holes, the uniformity is improved, and the local excess charge and discharge is avoided so as to improve the safety performance; and the rate performance, the cycle life and the energy conversion efficiency of the battery are improved.

The invention belongs to the field of biological genetic engineering, and provides a dual-promoter inducible secretable shuttle plasmid. The shuttle plasmid consists of an enzyme cutting Escherichia coli pET-28a plasmid and an enzyme cutting bacillus subtilis pE194 plasmid, wherein a lysozyme-antibacterial peptide functional fragment and an antibacterial peptide gene are inserted into the enzyme cutting Escherichia coli pET-28a plasmid. The invention also provides a method for constructing the dual-promoter inducible secretable shuttle plasmid. The shuttle plasmid is transferred to a prokaryote to express proteins such as toxalbumin, cecropin and the like in a fusion mode without toxicity to a host. The shuttle plasmid constructed by the method can be induced by IPTG or lactose to improve gene expression level; the shuttle plasmid is also suitable for exocrine expression, and a target protein for the exocrine expression is convenient to process and is not polluted by endotoxin; and because the shuttle plasmid has dual functional promoters, different genes can be inserted in appropriate correct directions for gene expression.

The invention belongs to the technical field of battery materials, and particularly relates to a gel electrolyte diaphragm, a preparation method thereof and a lithium ion battery. The gel electrolyte diaphragm comprises a high-molecular polymer material, lithium bis(trifluoromethanesulfonyl) imide and guanidine salt ionic liquid. The guanidine salt ionic liquid in the gel electrolyte diaphragm has the advantages of stability, no volatilization, long service life, high conductivity and the like, and nitrogen contains lone pair electrons which can be coordinated with metal ions and particularly have a strong attraction effect on Mn<2+>, so that Mn<2+> generated by disproportionation reaction of a lithium manganate material is extracted; and Mn<2+> is prevented from attaching to the negative electrode to cause capacity attenuation. The gel electrolyte diaphragm is a porous polymer diaphragm, is suitable for being used in a lithium manganate battery, and can effectively prevent Mn<2+> from migrating to a negative electrode through an electrolyte.

The invention provides a preparation method for a three-dimensional carbon nanotube / graphene / sulfur electrode slice. The preparation method comprises the following steps of (1) adding the carbon nanotube, graphene and polyacrylonitrile to N-methyl pyrrolidone, performing an ultrasonic reaction, coating an aluminium foil with mixed paste, and performing vacuum drying to obtain the electrode slice; (2) putting the obtained electrode slice into a muffle furnace under inert gas protection, slowly heating to 400-500 DEG C, and naturally cooling; and (3) enabling the electrode slice obtained in the step (2) to be fully inserted into a Na2S2O3 solution, standing for 30-60min, and slowly adding hydrochloric acid to the solution in a dropwise manner until the PH value of the solution reaches 7, taking out the electrode slice, and drying the electrode slice to obtain a positive plate. The electrode slice prepared by the invention can be directly used for the positive electrode of a lithium-sulfur battery without requiring a conductive agent and a binder, so that the cost of the electrode is greatly lowered.

The invention discloses a method for synthesizing metal-phase vanadium / molybdenum disulfide / carbon cloth as a negative electrode material of a sodium-ion battery by a simple hydrothermal method. According to the invention, the carbon cloth is used as a substrate for in-situ growth of the nanosheet-shaped metal phase vanadium / molybdenum disulfide, and the nanosheet-shaped metal phase vanadium / molybdenum disulfide can be directly used as a negative electrode material of a sodium-ion battery without adding a conductive agent and a binder, so that the conductivity and utilization rate of the material are improved, and an ion intercalation barrier layer is reduced. Meanwhile, intercalation of vanadium can further enlarge the interlayer spacing of the material, and the charge-discharge specificcapacity and the cycling stability of the electrode material are remarkably improved. The sodium ion battery negative electrode material disclosed by the invention is simple in experimental operationand low in production cost, and has a wide industrial application prospect.

The invention discloses a hexagonal ferric oxide / carbon negative electrode material and a preparation method therefor. The negative electrode material is prepared by the steps of (1) performing uniform mixing on water and N, N-dimethyl formamide to obtain a uniform solution; (2) adding an iron source and an organic ligand and performing stirring to obtain a mixed solution; (3) performing sealing,a heating reaction, cooling, filtering, washing and drying to obtain yellow powder; and (4) performing roasting and cooling in an inert atmosphere. The negative electrode material obtained in the invention is 3-5[mu]m in grain diameter and is a mesoporous material; when the negative electrode material is assembled into a battery, the initial charging specific capacity can reach 923.5mAh.g<-1> at 0.01-3V and 100mA.g<-1>; after 200 cycles, the capacity retention ratio can be greater than or equal to 95%; the initial discharging specific capacity can reach 1,368.8mAh.g<-1>; in the charging and discharging processes, low volume expansion, high conductivity, stable charging and discharging performance and high cycle performance are achieved; and the method is simple, low in reaction temperature, short in period and low in cost.

The invention discloses an efficient whole-rod type sugarcane combine-harvester. The combine-harvester comprises a tail removal device located on a harvester frame, two or more straightening devices with the outer roller space adjustable, two or more root cutting devices with the space adjustable, a conveying device, a loading and unloading device, a traveling mechanism with the space between a left wheel and a right wheel adjustable and a harvester frame structure with the ground clearance adjustable; the tail removal device comprises a leaf smashing roller and a leaf smashing motor driving the leaf smashing roller to rotate, leaf smashing strips and tail tip clamping rods are arranged at the peripheral circle of the leaf smashing roller alternately, and the tail tip clamping rods are used for beating away tail tips of sugarcane; each straightening device comprises a ground attachment awl and a straightening roller arranged above the corresponding ground attachment awl, each ground attachment awl scoops up the sugarcane on the ground and delivers the sugarcane to the corresponding straightening roller, and each straightening roller aligns the sugarcane and lifts the sugarcane to the operation scope of the corresponding root cutting device. The efficient whole-rod type sugarcane combine-harvester has the advantages of being simple in procedure, extremely high in efficiency, reasonable in structure and reliable in work, and the same machine can be used for multiple purposes.

The invention discloses a preparation method of a lithium ion solid electrolyte with high ionic conductivity at room temperature. The method comprises the following steps: functionalizing an ionic liquid, crosslinking with a polymer, reacting with lithium bis (trifluoromethylsulfonyl) imide (LiTFSI) in an ethanol solution, washing and drying to obtain a TFSI-anionic ionic liquid, then adding a ceramic solid electrolyte and a photocatalyst, stirring and dispersing, and curing to form a film, so as to obtain a solid electrolyte. According to the invention, the polymerizable ionic liquid and the ceramic electrolyte with high ionic conductivity are combined to prepare the solid electrolyte with high ionic conductivity at room temperature, the solid electrolyte has extremely high ionic conductivity at room temperature, and the electrolyte and the electrode have excellent interfacial compatibility.

The invention discloses a long-endurance button lithium battery and a manufacturing method thereof, the button lithium battery comprises seven parts: a positive pole piece, a negative pole piece, an electrolyte, a stainless steel shell, a lithium piece, a diaphragm and insulating rubber, and the functional material in the positive pole piece is an organic material generated through reaction of perylene-3,4,9,10-tetracarboxylic dianhydride, and tris (2-aminoethyl) amine in N-methyl pyrrolidone medium; and the functional material in the negative pole piece is a composite material generated by reacting ferric acetylacetonate Fe (acac) 3, polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA) in N, N-dimethylformamide medium. The invention has the advantages of long service life, small cycle attenuation, good stability and easy molding.

The present invention relates to an air compression type engine for aviation. The conventional aircraft engine is complicated in structure, consumes expensive aero fuel, and produces extremely loud noise during operation. Therefore, the present invention employs a turbo-charged air compressor to generate high temperature and high pressure gas in the pressure chamber, and uses the reaction thrust force generated by ejecting the compressed air through the nozzle to make the aircraft vertically take off / land, suspend in the air and fly forwardly. Benefited from the simple structure, the manufacture cost of the aircraft engine can be dramatically decreased. Vertically raising and landing the aircraft can be achieved by changing the ejection directed of the compressed air in the pressure chamber. The commonly used gasoline or diesel, which is cost saving and capable of combusting with a high combustion value, can be used instead of the expensive aviation kerosene. Further, the generated noise is quite small. By means of above arrangement, it is possible to manufacture a jet type manned craft like a car, which can be operated by common people to vertically take off / land and shuttle conveniently in the downtown area through simple operation procedure.

The invention relates to extraction and extraction equipment of a rose cell sap raw material for skin care, and belongs to the field of rose cell sap preparation, the extraction and extraction equipment comprises a main frame body, a freezing device and an extraction device are installed on the main frame body, the freezing device comprises a freezing tank, a pushing mechanism and a freezing mechanism, and the freezing mechanism is used for supplying cold air subjected to water removal treatment into the freezing tank; the pushing mechanism is used for pulling the frozen roses to move into the extracting device, the extracting device comprises an extracting mechanism, an air heater and a condenser, and the extracting mechanism is used for receiving the frozen roses and crushing the roses; the air heater is detachably communicated with the air inlet end of the extraction mechanism and is used for supplying dry, low-pressure and low-temperature hot air into the extraction mechanism, and the condenser is detachably communicated with the air outlet end of the extraction mechanism and is used for receiving the air doped with the rose cell sap and condensing the air to obtain the rose cell sap; an extraction tank in the extraction mechanism can rotate around a rotating shaft.

The invention provides a positive host material and a preparation method and application thereof. The preparation method of the positive host material comprises the following steps: (1) adding metal salt, ferrite, ascorbic acid and an imidazole compound into water, mixing and reacting to obtain a flower-like precursor; and (2) carrying out high-temperature treatment on the flower-like precursor obtained in the step (1) to obtain the positive host material. According to the invention, ascorbic acid is added in the preparation process; a flower-like precursor with a specific morphology is obtained; the compactness and thickness of lamellar stacking are regulated and controlled by controlling the amounts of ferrite and ascorbic acid, and in the high-temperature treatment process, a large-sizepositive host material can be anchored on the surface layer by utilizing a carbon source and a catalyst in a flower-shaped precursor of the positive host material without additionally adding the carbon source and the catalyst, and the positive host material is obtained in a hollow carbon tube; the positive host material is applied to the lithium-sulfur battery, and the electrochemical performanceof the lithium-sulfur battery can be improved.

An edge network switching method based on dynamic mobile device behavior prediction belongs to the technical field of flow control, and comprises the following steps: S1, establishing an edge node architecture; S2, establishing a service handshake linkage mechanism of a first layer; executing the step 3 and the step 4 at the same time; S3, if the number of the mobile devices served by the edge computing server is overloaded, adjusting the deployment of the mobile devices; S4, establishing and updating a mobile prediction model: adopting a hidden Markov model and redefining parameters; S5, enabling the edge computing server to judge whether the mobile device moves or not; S6, enabling the edge computing server to enable the mobile device and the target edge computing server to establish service handover; and enabling the edge computing server to trigger a second service handshake linkage mechanism. According to the scheme, the hidden Markov model is adopted to predict the network switching trend of the mobile device, so that an edge computing server for preparing service in advance is reduced.

The invention relates to a two-purpose tricycle capable of switching between vegetable basket and compartment. The tricycle comprises an tricycle frame body, a handle connectedto that front end of theframe body and a front wheel connected to the low end thereof, and rear wheels arranged on both sides of the rear end of the frame body, and a front chain disk and an electric motor arranged in the middle of the frame body, the vehicle frame body comprises a front axle frame, The left rear axle and the right rear axle, the left rear axle and the right rear axle are respectively slidably connectedwith the front axle frame, The rear chain disk and battery are also secured, The vegetable basket and the compartment are both arranged at the t rear end of the frame body, A left rear axle and a right rear axle structure slidably connected with a front bridge are adopted, in conjunction with the telescopic bridge bar to achieve the volume adjustment of the frame body, At the same time, the utility model adopts the folding vegetable basket and a split combined car structure to achieve the vegetable basket, and the tricycle is switched or used together to satisfy the multi-purpose of one tricycle, so that the utility model not only can satisfy the load unloading, but also can reduce the volume and improve the driving flexibility of the whole car, and is convenient to shuttle on narrow roads such as a vegetable farm and the like.