386results about How to "Increase transfer rate" patented technology

The invention discloses a self-adaptive communication method and system for ubiquitous electric power Internet of Things intelligent metering equipment, relates to the technical field of Internet of Things communication, and solves the problems of inaccurate quantitative communication, insufficient communication efficiency and poor flexibility in existing intelligent metering equipment communication. According to the invention, the accuracy and reliability of data transmission are improved through a dynamic network self-organizing algorithm and a multi-hop communication mechanism, the communication efficiency is optimized through multi-path transmission and dynamic spectrum management, and the flexibility and adaptability of the network are enhanced through an adaptive modulation coding model and a real-time optimization link selection strategy. And secure transmission of the data is further guaranteed through a multi-layer security mechanism, and the communication performance and flexibility of the intelligent metering equipment are remarkably improved.

The invention provides an MBB multi-channel local aggregation superposition transmission method and an MBB multi-channel local aggregation superposition transmission system. Belongs to the technical field of communication. The method comprises the following steps that: a plurality of physical links are established in a wireless communication system, and the system selects the plurality of optimal physical links for aggregation according to a current network environment, a current equipment state and a current user demand; dividing data to be transmitted into a plurality of data packets, packaging each data packet according to the characteristics of the selected physical link, and transmitting the packaged data packets in parallel through the selected physical link; in the transmission process, the system monitors the transmission state of each link in real time, and dynamically adjusts the transmission rate and power distribution of each link according to the current network load and equipment state. By transmitting a plurality of physical links in parallel, the network bandwidth can be fully utilized, the data transmission rate is improved, and the transmission delay is reduced.

The invention discloses a data cooperative transmission method and system for a low earth orbit satellite Internet of Things terminal, and the method specifically comprises the steps: carrying out the classification cutting of environment data, and forming a plurality of environment data subsets; determining a plurality of cooperative sending terminals and respective optimal communication paths between the first low earth orbit satellite Internet of Things terminal and each cooperative sending terminal based on a communication topological structure relationship between the low earth orbit satellite Internet of Things terminals in the ad hoc network; transmitting the environment data subsets with different priorities to corresponding cooperative sending terminals through different optimal communication paths; and according to the environment data subsets sent by each cooperative sending terminal and received by the low-orbit satellite, splicing the environment data subsets and forwarding the spliced environment data subsets to a target terminal or a ground station or a data center. According to the invention, the cooperative effect among a plurality of low-orbit satellite Internet of Things terminals can be fully utilized, and stable and reliable data transmission under the requirements of large data volume and high real-time performance is realized.

The lithium nickel manganese oxide positive electrode material, the preparation method thereof and the electrochemical device are characterized in that the lithium nickel manganese oxide positive electrode material provided by the embodiment of the invention comprises a base material and a coating layer located on the surface of the base material, the general formula of the base material is Li (LiaNixMnyMbO4), the element M comprises at least one of Ti, Zr, Al, Nb and Mo, and a is more than or equal to 0.02 and less than or equal to 0.06; 0.45 < = x < = 0.55, 1.4 < = y < = 1.6; 0.05 < = b < = 0.55; a + x + y + b = 2, and the coating layer contains phosphate. According to the lithium nickel manganese oxide positive electrode material, through doping and coating technologies, under the condition that the capacity is not sacrificed, the gas production phenomenon is effectively reduced, the cycling stability of the lithium nickel manganese oxide positive electrode material is improved, and the service life of an electrochemical device applying the lithium nickel manganese oxide positive electrode material is prolonged.

The invention discloses a method for directly repairing and regenerating a ternary positive electrode recycled material. The method comprises the following steps: S1, disassembling a ternary retired battery; s2, sintering to remove impurities; s3, removing powder and sieving; s4, mixing with crystalline lithium salt; s5, crushing and sieving after sintering and cooling; s6, mixing with a metal oxide; and S7, sintering, cooling, removing iron, and sieving. The eutectic lithium salt is used as a lithium source for lithium supplement, so that the diffusion rate of lithium ions can be increased, the concentration of the lithium ions can be improved, the reaction temperature of lithium supplement recovery can be reduced, and the energy consumption can be reduced. The ternary lithium battery is wrapped by the metal oxide, residual lithium on the surface of the material can be utilized, a layer of fast ion conductor can be formed on the surface of the material in situ, and the residual lithium on the washed surface is removed, so that the process is shortened, the cost is reduced, the transmission rate of lithium ions can be further improved, and the rate capability of the battery is improved. And the fast ion conductor structure can isolate the contact between the electrolyte and the positive electrode material, so that side reaction is reduced, and the cycle performance is improved.

The invention discloses a lithium salt doped porous carbon coated graphite composite material for an energy storage battery and a preparation method thereof, the composite material has a core-shell structure, the core is graphite, and the shell is a lithium salt doped porous carbon complex. The preparation method comprises the following steps: uniformly mixing amino resin, a pore-forming agent and a heteroatom compound of the pore-forming agent, curing, activating to obtain porous carbon, adding the porous carbon into an inorganic lithium salt, uniformly mixing, and carrying out spray drying to obtain lithium salt doped porous carbon; the preparation method comprises the following steps: adding lithium salt doped porous carbon into a carboxymethyl cellulose lithium solution, uniformly dispersing, then adding into a graphite material, uniformly dispersing, spray-drying, and carbonizing to obtain the lithium salt doped porous carbon coated graphite composite material. According to the obtained material, the coating layer lithium salt is doped with porous carbon, so that the liquid absorption and retention capacity of the material is improved, the diffusion rate of lithium ions is increased, and the rate capability is improved; meanwhile, the expansion of the composite material in the charging and discharging process is reduced by utilizing the low expansion of the porous carbon, and the cycle performance is improved.

The invention discloses a high-conductivity bridged silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The high-conductivity bridged silicon-carbon composite material comprises a core-shell structure with an inner core and an outer shell, the inner core is porous carbon and a carbon nano tube growing on the surface of the porous carbon in situ, and a nano silicon layer is attached to pores and surfaces of the porous carbon and the carbon nano tube; and the shell is a carbon coating layer. According to the high-conductivity bridged silicon-carbon composite material provided by the invention, the carbon nanotubes are grown on the surface of the porous carbon in situ, and contact among particles is similar to bridging, so that a point-line conductive network is formed, the intrinsic conductivity of the composite material is improved, and the electron transfer rate is accelerated. Meanwhile, the carbon nanotubes have extremely high strength and hardness, the mechanical strength of the porous carbon substrate can be remarkably improved by introducing the carbon nanotubes into the porous carbon material, expansion of nano silicon in the charging and discharging process can be better restrained, and the performance of high capacity, high first efficiency, long circulation and high magnification is shown.

The invention discloses a bidirectional transceiver circuit with automatic direction and edge acceleration, which comprises a first transceiver and a second transceiver, and the two transceivers have the same structure and are in a symmetrical structure after being connected. The transmission direction of the bidirectional transceiver can be automatically identified and configured, a direction control signal is not needed, the bidirectional transceiver internally generates a pulse signal at the moment that an input signal changes to open strong driving output, the change of the output signal is accelerated, and the output driving capability and the transmission rate are improved; and meanwhile, an internal enable signal is generated to close strong driving output of an input side, so that input signals are prevented from being influenced.

The invention provides a joint channel and route selection cross-layer decision-making method based on Q learning. The method comprises the following steps: acquiring coordinates; each routing node periodically broadcasts messages used for discovering, establishing and keeping alive neighbor relations; after receiving the Hello packet, the neighbor node feeds back an acknowledgement message and establishes a neighbor relationship; when data needs to be transmitted in the source node, the source node selects a next-hop node and a channel transmission data packet according to a selection strategy, and the data packet comprises the address of the selected next-hop node; the neighbor point judges whether the data packet should be forwarded by the neighbor point; the next-hop node replies to the source node through the control link, wherein reply information comprises the estimated signal-to-interference ratio and the latest Q table of the next-hop node; the source node calculates a reward value according to the feedback signal-to-interference ratio and the position obtained in the earlier stage; and the source node updates the Q table and the node selection strategy according to the reward value. According to the method, the network transmission rate and the anti-interference performance are improved, and the end-to-end time delay and hop count are reduced.

The invention provides a high-performance all-solid-state electrolytic tank for producing hydrogen by electrolyzing water and a preparation method of the high-performance all-solid-state electrolytic tank. The preparation method mainly comprises the following steps: preparation of electrode powder: preparing (La0. 6Sr0. 4) 0.95 Co0. 2Fe0. 8O3-delta (LSCF) powder by adopting a liquid-phase synthesis method, and preparing MxCe1-xNyO2 powder by adopting a coprecipitation method for an electrode and an isolating layer; preparing a half cell by adopting a co-casting process; an isolating layer and an oxygen electrode are prepared by adopting a silk-screen printing technology, and high-content water vapor is introduced to realize hydrogen production by electrolyzing water. The prepared high-performance all-solid-state electrolytic tank has efficient water electrolysis hydrogen production catalytic activity and Faraday efficiency, can operate at the medium-high temperature of 650-850 DEG C, and can effectively reduce electric energy consumption and improve energy conversion efficiency.

The invention discloses a monatomic catalyst for activating peroxymonosulfate as well as a preparation method and application of the monatomic catalyst. The catalyst comprises a nitrogen and sulfur co-doped Ti3C2Tx nanosheet and an iron monatomic or cobalt monatomic targeted on the nanosheet in an asymmetric coordination structure. The preparation method comprises the following steps: mixing the Ti3C2Tx nanosheet, a precursor containing a nitrogen source and a sulfur source, and soluble metal salt, self-assembling, freeze-drying and pyrolyzing. The monatomic catalyst provided by the invention has excellent conductivity and electronic structure, can form a large amount of reactive oxygen species in a catalytic degradation system on the premise of low addition amount of peroxymonosulfate, and has the advantages of high activation efficiency on peroxymonosulfate, capability of effectively reducing the usage amount of peroxymonosulfate and the like; the peroxymonosulfate can be activated to achieve efficient purification of organic wastewater, the operation cost of the peroxymonosulfate activation technology can be effectively reduced, and meanwhile, the new environmental pollution risk caused by the fact that a large amount of peroxymonosulfate is used can be remarkably reduced.

The invention relates to the technical field of drying, and discloses a solar heat collection tube heating and drying device and a tube row manufacturing method thereof.The solar heat collection tube heating and drying device comprises a first rack, and a first heat collection module is arranged on an inclined mounting platform formed by a first-stage step and a second-stage step of the first rack; a drying cavity defined by first steel plates is installed on the outer wall of the three-stage step of the first rack, and a first partition plate is arranged in the drying cavity. A second partition is arranged on the top surface of the first partition, a third partition is arranged on the side wall of the second partition, and an air delivery pipe is arranged between the third partition and the first partition; an air inlet shutter is mounted on the first steel plate, a fan opposite to the air inlet shutter is mounted on the second partition plate, and an exhaust shutter is mounted on the first steel plate; a supporting beam located above the third partition plate is arranged on the first rack, a footstand is arranged on the supporting beam, and a drying bin used for drying corn is placed on the footstand; according to the device, the solar energy utilization rate is increased through the heat collection structure, heat collection and drying chambers are reasonably partitioned, the airflow circulation path is clear, and stable drying of corn is achieved.

The invention provides a preparation method and application of a sulfide electrolyte and a composite solid electrolyte. The invention provides a liquid-phase synthetic sulfide electrolyte, and a composite solid electrolyte is prepared on the basis of the electrolyte, and has good chemical stability, interface conductivity and thermal stability during application; the conductive polymer material can form polymer fibers under the action of high-speed shearing force, so that the processability of the electrolyte can be effectively improved; after the film is formed, a fiber net structure can be formed, a polymerization state with a non-localized pi-electron conjugated system is generated, and the transmission rate of electrons and ions can be effectively improved; by introducing the conductive polymer material, the stability of the electrolyte membrane can be effectively improved, and good conductivity and material stability can still be kept at high temperature; surfactants are introduced to the two sides of the solid electrolyte membrane, the affinity to the positive electrode material and the affinity to the negative electrode material are improved through acting force, and then the conductivity and the surface resistance are improved.

The invention relates to a double-layer coated silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding a porous carbon precursor with a particle size D50 of 5-10 [mu] m into a chemical vapor deposition furnace, and introducing monosilane for 100-800 min for silicon deposition to obtain a silicon-carbon composite material; introducing acetylene gas, and reacting for 50 to 500 minutes to obtain a primary carbon-coated silicon carbon composite material; dissolving lithium nitrate in absolute ethyl alcohol, adding the primary carbon-coated porous silicon-carbon composite material, stirring and dispersing, dropwise adding an ammonium dihydrogen phosphate solution into the solution, and reacting at 60-80 DEG C for 1-3 hours; and carrying out suction filtration, cleaning and drying on the reacted material to obtain the porous silicon-carbon composite material with the double-layer coating structure. Through the double-layer coating structure, the electrochemical stability and mechanical stability of the material are improved, and meanwhile, the application scene of the silicon-carbon negative electrode material at low temperature is expanded.

The invention relates to the field of power line communication, in particular to a power line communication system based on a multi-carrier aggregation technology, which is characterized in that transmission interference characterization values of power line networks in regions are determined based on collected environment characteristics of each region in combination with corresponding sudden noise intensity; the method comprises the following steps of: dividing abnormal tendency categories of transmission work of a power line network in each region according to different regions, and calling related modules for analysis, including obtaining interference characteristic analysis transmission parameters of each branched transmission path in the region, so as to judge whether data signal transmission of the branched transmission path meets a transmission standard or not, and identifying a corresponding offset branched transmission path; analyzing a carrier transmission abnormity characterization coefficient according to the path data signal intensity and the data signal transmission rate so as to identify whether the carrier frequency band of the data signal in each branch transmission path needs to be adjusted; according to the invention, interference factor changes affecting power line communication can be captured in time, a path area where a fault may occur can be identified in time, and the quality of data signal transmission is ensured.

The invention relates to a catalytic system for preparing a cycloolefin copolymer and application. The catalytic system comprises a main catalyst, a catalyst promoter and a chain transfer agent, the main catalyst is a silane-bridged fluorenyl amino dimethyl titanium complex, a silane-bridged fluorenyl amino dimethyl zirconium complex, a silane-bridged fluorenyl amino dimethyl hafnium complex or a silane-bridged fluorenyl amino hafnium dichloride complex; the auxiliary catalyst is a silane-bridged fluorenyl amino dimethyl titanium complex, a silane-bridged fluorenyl amino dimethyl zirconium complex, a silane-bridged fluorenyl amino dimethyl hafnium complex or a silane-bridged fluorenyl amino dimethyl hafnium complex; the cocatalyst is an aluminum compound or a boron compound; the chain transfer agent is more than one of second main / subgroup metal complexes; during application, the catalytic system is adopted, and cycloolefin and non-cyclic olefin are subjected to a copolymerization reaction under the catalytic action of the catalytic system to prepare the cycloolefin copolymer. According to the catalytic system disclosed by the invention, the consumption of expensive silane-bridged metal complexes is remarkably reduced, and powerful regulation and control on the molecular weight of a polymer are realized while high polymerization activity is maintained; the prepared cycloolefin copolymer has the advantages of adjustable molecular weight wide range, narrow molecular weight distribution, and controllable cycloolefin insertion rate and glass transition temperature.

The invention relates to the technical field of batteries, in particular to a positive plate and a battery comprising the positive plate. The positive plate comprises a positive current collector and a positive active material layer located on the surface of one side or two sides of the positive current collector, the positive active material layer comprises a three-dimensional network skeleton and a positive active material located in the three-dimensional network skeleton, and the three-dimensional network skeleton is formed by a conductive binder; the conductive adhesive comprises a carbon nanotube and an adhesive layer located on at least part of the surface of the carbon nanotube, the adhesive layer comprises an ester group, an amino group and a silane group, and the ratio of the number of the amino group and / or the silane group to the number of the ester group is (3-6): 1. The positive plate disclosed by the invention has relatively high toughness and is not easy to break, and meanwhile, the wettability and the conductivity of an electrolyte on the positive plate can be improved, so that the transmission rate of lithium ions and electrons in the positive plate is improved, the cyclic expansion rate of the battery is further reduced, and the cycle performance and the safety performance of the battery are improved.

The invention relates to the technical field of electronic tracking marks, in particular to a whole-course traceable pig intelligent electronic ear tag and method for livestock breeding. The live pig intelligent electronic ear tag comprises a nonlinear characteristic analysis module, a behavior trend modeling module, a coding strategy adjustment module, a compression efficiency evaluation module, an abnormal mode monitoring module, a resource adjustment strategy module and a behavior early warning feedback module. And the nonlinear characteristic analysis module processes time sequence data by adopting a chaos theory analysis method based on live pig monitoring data. According to the invention, by integrating nonlinear characteristic analysis, behavior trend modeling, coding strategy adjustment, compression efficiency evaluation, abnormal mode monitoring, resource adjustment strategy and behavior early warning feedback modules, the efficiency of livestock breeding management is improved. The application of a chaos theory analysis method and a dynamic modeling technology makes prediction of live pig behaviors and identification of abnormal modes more accurate.

The invention relates to the field of sodium ion battery positive electrode materials, in particular to an rGO-coated Mn-Ti co-doped sodium ferric fluorophosphate material as well as a preparation method and application of the rGO-coated Mn-Ti co-doped sodium ferric fluorophosphate material. The chemical formula of the catalyst is Na2FexMnyTizPO4F (at) rGO, wherein 0.05 < = y < = 0.10, 0.02 < = z < = 0.05, and x + y + z = 1; by optimizing the raw material proportion and sintering conditions and adopting the two-time sintering process of low-temperature pre-sintering-ball milling in the inert atmosphere-secondary sintering, the raw materials are uniformly mixed on the premise that the raw materials are not oxidized and deteriorated by air, the contact area is increased, efficient ion migration and lattice formation among reactants are facilitated, and the purity of the product is improved. The anion F with strong electronegativity is successfully introduced to form a relatively strong binding force with a phosphate group, so that the generation of pyrophosphoric acid is inhibited, and the crystal structure is optimized; through Mn-Ti co-doping, the stability of a voltage platform and a material structure is effectively improved, so that the material has relatively high energy density and relatively long cycle life; meanwhile, a stable interface layer can be formed on the surface of the material through two-dimensional rGO coating, interface side reactions are reduced, and the cycling stability is improved.

The invention provides a cellulose composite carbon aerogel and a preparation method thereof, and the cellulose composite carbon aerogel is prepared by taking cellulose nanofibers and carbon nanotubes as raw materials, mixing and dispersing the raw materials through dispersoid, and then preparing cellulose nanofiber / carbon nanotube composite carbon aerogel through bidirectional freezing, freeze drying and high-temperature carbonization. The invention also provides an application of the cellulose composite carbon aerogel in the aspect of a battery electrode, and the cellulose composite carbon aerogel has an ultra-large specific surface area and an excellent compression ratio under ultra-low density, and shows super-hydrophilicity, high electrochemical activity, good compression resilience, good structural stability and certain mechanical strength; and the method can be used for various electrochemistry-based water-based flow batteries. The invention solves the technical problem that the existing cellulose carbon aerogel is poor in compressibility and mechanical strength, and belongs to the technical field of batteries.

The invention provides a communication perception integrated waveform design method for the Internet of Vehicles, which belongs to the technical field of wireless communication, and can realize peak performance, enhance radar capability and ensure efficient communication by minimizing the weight sum of multi-user interference, the similarity between a design waveform and a reference waveform, a Cramer-Rao bound and an ISAC waveform. According to the method, optimization with the total transmission power and the peak-to-average power ratio as constraints is adopted, a non-convex problem is converted into a convex problem, an alternating direction multiplier method algorithm is adopted for solving, and a simulation result shows that the ISAC waveform has good communication and target detection capability, and the V2X spectrum utilization rate can be improved. According to the method, a target can be detected during communication with a downlink user, the sum of MUI, CRB and waveform similarity is minimized, weighing parameters are introduced, flexible weighing between communication and sensing is achieved under the constraint of the total power and the peak-to-average power ratio, the method better adapts to a V2X high-dynamic scene, and mutual interference caused by separation of traditional sensing and communication functions is reduced.

The invention relates to a two-phase electrolyte and an electrochemical device, the two-phase electrolyte comprises an electrolyte salt, water and an organic solvent, the difference value of the Hildbrand solubility parameter of the water and the Hildbrand solubility parameter of the organic solvent is 13.5-15.3, and the relative dielectric constant of the organic solvent is 5-80. The water phase-organic phase in the double-phase electrolyte provided by the invention can realize spontaneous phase separation, and the double-phase electrolyte is a stable water phase-organic phase double-phase electrolyte, so that the problems of negative electrode hydrogen evolution corrosion, dendritic crystal growth and the like can be solved, and the ion transmission efficiency is improved; the battery using the two-phase electrolyte shows better long-term cycle life and high capacity retention rate.

The invention relates to a communication crosstalk suppression method and a communication system, and the method comprises the steps: firstly obtaining the communication state data of a target network during the communication crosstalk suppression, and judging whether there is crosstalk between the target network and other networks or not according to the communication state data. And under the condition that crosstalk exists between the target network and other networks, adjusting a communication signal of the target network according to the first signal adjustment mode, and synchronously obtaining a communication quality parameter after signal adjustment. And if the adjusted communication quality parameter of the communication signal does not meet the preset communication condition, adjusting the communication signal according to a second signal adjustment mode. Wherein the first signal adjusting mode and the second signal adjusting mode are different adjusting modes. According to the communication crosstalk suppression method, the signal adjustment mode can be flexibly selected according to the communication quality parameter and the preset communication quality condition, the quality of the communication signal during communication transmission is improved on the premise of ensuring reliable data transmission, and the transmission rate of the communication signal is improved.

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

The invention provides a preparation method of a dication positive electrode material. The preparation method comprises the following steps: preparing a conductive polymer monomer and a heteropoly acid aqueous solution; carrying out electrolysis on the heteropolyacid aqueous solution; after electrolysis, Li2CO3 and Na2CO3 are added, and after the reaction is completed, separated-out heteropoly blue lithium sodium crystals are separated; adding the crystals into a conductive polymer monomer aqueous solution to obtain a mixture; dropwise adding an excessive strong oxidizing acid dilute solution into the mixture, and reacting at 140-180 DEG C for 16-24 hours; and repeatedly washing the separated solid substance after the hydrothermal reaction with deionized water, and drying to obtain the dicationic positive electrode material. The form of the heteropoly blue lithium sodium still keeps the skeleton structure of heteropoly acid radical anions, and the skeleton structure can ensure that lithium ions and sodium ions can be transmitted in the skeleton of the heteropoly blue lithium sodium; and the conductive polymer prepared by the method is of a porous structure, and sodium ions with large radius can be transmitted through pores of the conductive polymer, so that the ionic conductivity of the heteropoly blue lithium sodium can be improved to a certain extent.

The utility model relates to the technical field of electroplating, and discloses a waste liquid treatment device and an electroplating system. The waste liquid treatment device comprises an installation frame, a treatment box, an anode plate and a cathode plate, the treatment box is installed in the installation frame and suitable for being immersed in waste liquid, the treatment box comprises a box body with a cavity and an opening formed in the top of the box body, at least one side face of the box body is provided with a hollowed-out hole, and the hollowed-out hole is covered with an ionic membrane; the ionic membrane is used for separating water molecules and acid radical ions in the waste liquid, the anode plate is arranged in the cavity from the opening and is suitable for introducing the acid radical ions into the cavity, and the cathode plate is arranged in the waste liquid outside the treatment box and is electrically connected with the anode plate. Acid radical ions in the waste liquid enter the cavity to be concentrated and are effectively separated from water molecules in the waste liquid. Main pollutants in the separated waste liquid are removed, so that the separated waste liquid can be reused, the waste of water resources is reduced, the discharge amount of the waste liquid is reduced, and the treatment cost of the waste liquid is effectively saved.

The invention provides a modified diaphragm for a polyanion solid sodium battery and a preparation method of the modified diaphragm. The modified diaphragm comprises: a base membrane; the solid electrolyte layer is arranged on at least one side surface of the base membrane, and the solid electrolyte layer comprises an oxide solid electrolyte and a polymer solid electrolyte; and the gel electrolyte layer is arranged on the outer surface of the oxide solid electrolyte layer. According to the invention, the diaphragm can better adapt to a high-pressure system, the transmission rate and the diffusion coefficient of sodium ions are improved, so that the cycle life of a polyanion solid sodium battery is prolonged, the rate capability and the low-temperature performance of the battery are improved, the thermal stability of the diaphragm is improved, and the service life of the battery is prolonged. The adverse effects of positive and negative electrode contact, chemical reaction and the like caused by thermal shrinkage of the diaphragm are avoided; in addition, the puncture resistance of the diaphragm is improved while the air permeability is not influenced and the dynamics is ensured, the addition amount of the liquid electrolyte is obviously reduced, and the safety performance of the battery is effectively improved.

The invention provides a LoRa system and a LoRa physical layer enhancement method based on intelligent reflective surface beamforming and index modulation, in the system, a transmitting side at least comprises Nk LoRa nodes equipped with single transmitting antennas and an RIS with N passive reflective elements, the RIS is used for improving a wireless propagation environment, beamforming is realized by controlling the phase of each passive reflective element, and the LoRa physical layer enhancement method is used for enhancing the physical layer of the LoRa. The instantaneous signal-to-noise ratio under the antenna combination is activated to the maximum, and the bit error rate performance is improved; a receiver at least comprises a LoRa gateway equipped with NR receiving antennas, multiple receiving antennas at the LoRa gateway are used for index modulation, and Nk receiving antennas in the NR receiving antennas are activated in each symbol period and serve as information transmission entities to bear additional information, so that the transmission throughput is remarkably improved. According to the LoRa physical layer enhancement method applied to the LoRa system, the wireless propagation environment is controlled through RIS beam forming to improve the quality of received signals, and the spectrum efficiency is improved by ingeniously utilizing the IM principle of multiple receiving antenna indexes, so that the LoRa physical layer enhancement method has high transmission rate and high reliability.