996results about How to "Achieve decentralization" patented technology

The invention discloses a graphene/carbon nanotube hybrid polymer composite material and a manufacturing method thereof. Graphene, carbon nanotube and a polymer matrix material are subjected to solution blending or mechanical blending to obtain the graphene/carbon nanotube hybrid polymer composite material. The high-conductivity high-mechanical-property composite material can be used as an antistatic and electromagnetic shielding material, can be made into conductive carpets, electronic product packages, mobile phone components, antistatic tread rubber for tires, electromagnetic shielding paint of aerospace devices and the like, and has wide application value.

The invention discloses a method for protecting the privacy of a smart contract of a block chain, which can verify correction of a transaction while covering transaction details, and can verify validity and effectiveness of an operation while protecting the user privacy. The technical scheme of the method is as follows: addition is used for homomorphically encrypting privacy data in the block chain, and non-interactive zero knowledge is generated in the transaction process for proving the effectiveness of the transaction.

The invention discloses a graphene-reinforced magnesium-aluminium matrix composite material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: dissolving graphene in an appropriate amount of ethanol solution and ultrasonically dispersing, then intermittently adding a metal powder in the solution, and ultrasonically dispersing and mechanically stirring simultaneously to obtain graphene/metal particle mixed solution with high dispersibility; sequentially carrying out the operations of heating in a low-temperature water bath to remove a solvent, drying in vacuum to obtain a powder, and continuously manually grinding the powder under an inert atmosphere, on the mixed solution, so as to obtain a graphene/metal particle composite powder with uniform dispersion; and carrying out hot-pressing on the composite powder into blocks, carrying out hot extrusion, and finally obtaining the graphene/metal matrix composite material. The preparation process disclosed by the invention is simple, environment-friendly, and free from addition of a non-volatile organic dispersant; low-temperature inert protection is adopted during the process of preparing the composite powder, and high own dispersion of graphene and high dispersion thereof in a metal matrix are achieved while the structural integrity of a graphene reinforcement is kept; and the preparation method is suitable for preparing the high-performance graphene-reinforced metal matrix composite material.

The invention relates to the technical field of big data processing, and particularly relates to a block chain based large scale data sharing method. The method is based on a block chain technology, and pieces of block data are connected in series according to the occurrence sequence to form the whole large scale data; corresponding functions are realized through a data access module, a payment module and a data evaluation module; the data access module is provided for a data source reporting party to report a data source and earning value pricing of a response, records the reported information and is used for receiving earnings; the payment module issues relevant tokens, a data demanding party pays tokens according to data utilization and acquisition conditions, the data source reportingparty acquires the tokens, and an intermediate party acquires service tokens; the tokens can be converted into actual earnings; and the data evaluation module is provided for the data source reportingparty to define an earning mode of the data, and a block chain data sharing network performs pricing on the data earnings according to the set method and lists pricing lists of various types of data.The method solves problems of slow response speed, IO bottleneck and the like in the traditional data centralization process, can promote utilization of various types of data and improves the utilization value.

The present invention relates to the technical field of networks, and discloses a method and a system for authority management based on a blockchain. The method comprises the steps that: each user generates respective mutually independent user secret keys by himself; the internal portion of an authorization server forms different role secret keys according to the high-low authorities correspondingto roles which the external users plays; an initiator user logs in the authorization server and uses his own user private keys and the role private keys corresponding to the user to create authorization transaction with another user; or, the initiator user uses his own role private keys to perform transaction and unlock the confirmed authorization transaction so as to create transaction with himself and form ex-right transaction with another user; the authorization server needs to verify digital signature information of the user who creates the transaction; and the forms of the user creatingthe transaction are recorded in a blockchain. The problems are solved that system centralization causes that performances and safety highly depend on a central processing unit, the authority information is not enough to be disclosed and transparent and both rights cannot be ensured at the same time in a traditional management and control system.

The invention discloses an energy internet trusted service management system and method based on a block chain. The system comprises a trust establishment module, a transaction management module and an attack defense module. The trust establishment module establishes trusted service interaction between different objects by using the block chain and a digital signature method, and provides a trustworthy environment for the service interaction by using the block chain technology; the transaction management module provides transaction management between a service provider and a server requester by using the transaction between an intelligent contract and block chain management service provider and the server requester; and the attack defense module is used for defending against external attacks, preventing network attacks and malicious node spoofing, and ensuring the credibility and security of the transaction. According to the energy internet trusted service management system and method,by adoption of the block chain technology, the transparency and decentralization of the energy internet trusted service management can be realized, the maintenance cost is greatly reduced, fast response can be made to the network change of the energy internet, and the data security of the block chain and the whole network security are protected.

The present invention relates to a graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and a preparation method thereof. The photocatalyst is synthesized by a two-step hydrothermal method, wherein graphene and magnetic particles are compounded to prepare magnetic graphene, the magnetic graphene is compounded with titanium dioxide nanoparticles synthesized by a hydrothermal method to prepare the three-element composite photocatalyst. The photocatalyst comprises three parts of the graphene, the titanium dioxide, and the magnetic nanoparticles, wherein the magnetic nanoparticles are loaded on the graphene lamellas to form the magnetic graphene having large specific surface area and magnetism, the rutile type titanium dioxide has a three-dimensional ordered nanostructure, and is loaded on the magnetic graphene lamellas to form the graphene composite rutile type titanium dioxide photocatalyst with the characteristic of magnetic separation, whereinthe photocatalyst has the large specific surface area, the nanoparticles have the magnetism, the photocatalyst can be separated and recovered, and has the efficient catalytic performance.

The invention discloses a remote sensing image change detection method based on watershed and treelet algorithms, belonging to the technical field of image processing. The remote sensing image variation detection method comprises the steps of: imputing two remote sensing images with different phases, denoising each image to obtain two denoised images with different phases and constructing a difference-value difference image; applying the watershed algorithm to obtain an initial over-segmentation labeled graph of the different image and adopting the treelet algorithm to combine the textural features of an over-segmentation labeled region, obtaining variable and non-variable binary images by clustering, and carrying out spatial restraint on the binary images by virtue of a variable-weight Markov stochastic field model to obtain post-processed images with edge consistency, and combing the communicating regions of the clustered binary images and the images with edge consistency to obtain a final change detection result. The method disclosed by the invention can effectively improve the processing efficiency of change detection and keep the edge information of the images, and can be used for detection of image changes in disaster monitoring and land utilization.

The invention provides a method and a device for preparing high-performance aluminum-base composite material under the action of the pulsed magnetic field with the in situ crystallization method, belonging to the technical field of material preparation. The method comprises the following steps: smelting to synthesize compound material melt at the temperature of 10-200 DEG C higher than the compound material melt liquidus temperature and pouring the compound material melt into a specially-designed crystallizer to make the compound material melt solidify under the action of the pulsed magnetic field. The pulsed magnetic field has the key parameters of the pulse width of 1-500 ms and the amplitude strength of 0.1-50T. The pulsed electromagnetic force is applied to the process of solidifying the compound material melt under the action of the pulsed magnetic field so as to refine the matrix structure and the particle reinforced phase of the compound material at the same time, control the growth of the particle reinforced phase in cluster, increase the bonding strength of the interface of the particle reinforced phase and the matrix and obviously improve the performance of the composite material.

The invention discloses a method for preparing a high-solid-content and low-viscosity suspended nano calcium carbonate slurry and re-suspended nano calcium carbonate power. The method comprises the following steps: preparing cationic and anionic high-solid-content and low-viscosity nano calcium carbonate slurry by using active nano calcium carbonate subjected to surface modification as a raw material; adding water into the obtained slurry to dilute the high-solid-content and low-viscosity suspended nano calcium carbonate slurry so as to obtain any low-viscosity suspended stable slurry; and then drying and crushing the high-solid-content suspended slurry through a special process so as to obtain nano calcium carbonate power which can be re-suspended in water. The obtained product prepared by the method of the invention is simple in preparation process, good in storage stability and wide in application range, and can be customized according to customer demands.

The invention discloses a method and a system for controlling an Internet-of-things device based on a block chain. The method comprises the following steps: registering the Internet-of-things device on an Internet-of-things platform through the equipment gateway; transmitting a device control instruction by a user through the Internet-of-things platform; calling the block chain service by the Internet-of-things platform, interacting with the intelligent contract through the block chain service, and calling the corresponding interface of the intelligent contract; triggering a contract event corresponding to the device control instruction by the intelligent contract; after monitoring the contract event, judging how to process the device control instruction according to the content in the contract event. The invention provides a method and a system for controlling device on the Internet-of-things based on a block chain. By realizing the scheme of combining the block chain with the Internet-of-things, the invention ensures the management and control of the control authority of the equipment, the tamper-proof operation record and the interconnection among the equipment, and realizes thedecentralization of the mode of issuing the equipment instruction, the service is more stable and the usability is higher.

The invention relates to a ciphertext retrieval fair payment method and system based on a block chain. The system comprises a data owner, a data user, a cloud platform and an intelligent contract deployed on the block chain. The encrypted data of the data owner is authorized to more than one data user for retrieval and decryption through the smart contract; the data user can initiate a search request when an authorization condition is met and enough search cost is stored in the smart contract; and the smart contract verifies the correctness and integrity of the search results returned by the cloud server, and after the verification is passed, the cloud server returns k search results with the highest relevancy to the data user. The problem of fair payment can be further solved.

The invention belongs to the technical field of nano, in particular to an original ecology separation and redispersion method of a nano metallic colloid. By taking spherical nano silver as an example, the method comprises the following steps: stirring and reacting silver salts under the existence of an organic protective agent and a reducing agent to obtain a nano silver colloid; adjusting the pH value of the nano silver colloid with acid, and continuously stirring and reacting until the colloid solution gradually appears flocks to obtain nano silver particles; and dispersing the nano silver particles in an organic solvent, and dispersing by ultrasonic to obtain the nano silver colloid dispersed in an original ecology mode. The invention can realize original ecology separation and redispersion repeatedly based on the interactive relationship among a dispersing agent, nano particles and the solution. The invention has the advantages of simple process, mild operation condition, short reaction time, little changes in particle size and appearance after repeated separation and dispersion, low preparation cost and no generation of harmful waste, and conforms to the requirement of green production.

The invention discloses a preparation method for synthesizing a graphene loaded noble metal catalyst in an organic phase, and belongs to the technical field of catalysts and preparation thereof. The method mainly comprises the following steps of: preparing pre-oxidized graphite powder; preparing glassy yellow oxidized graphite solution; preparing an oxidized graphite solid; dispersing oxidized graphite in N-methylpyrrolidone solution, and stripping the oxidized graphite by ultrasonic processing to prepare the N-methylpyrrolidone solution of oxidized graphene; and adding a stabilizing agent and a precursor of noble metal into the N-methylpyrrolidone solution of oxidized graphene, mixing fully, and heating to obtain the graphene loaded monodisperse noble metal catalyst in one step. The graphene loaded noble metal nano particle catalyst prepared by the method has high structural stability, dispersibility, stability and activity and large specific surface area.

The invention provides a CA authentication method based on a block chain, wherein the method comprises the following steps: receiving a request message sent by a client to apply for a digital certificate; acquiring applicant information and a user public key in the request message; obtaining a sub-key of a preset node in a block chain and generating a signature key; signing the applicant information and the user public key with the signing key, forming signature information, storing the signature information, the applicant information, and the user public key correspondingly in a block of a block chain to form a digital certificate of a request message for the client, wherein the node is a different CA authentication authorization center. Embodiments of the present application employ blockchain technology, enabling decentralization of CA certification authorization centers.

The invention discloses a winch hydraulic system controlling a guide rope through stepless speed regulating constant tension, and relates to the field of tension controlled winch hydraulic systems. The system comprises a fuel tank, a motor, a volume adjustable hydraulic pump, a one-way valve, a high-pressure overflow valve, a backpressure overflow valve, a motor operating valve bank, a winch motor, a brake oil cylinder, a plate-type overflow valve, a proportional overflow valve, a first threaded cartridge shuttle valve, a second threaded cartridge shuttle valve, a two-position two-way normally-closed ball valve, and a two-position three-way electromagnetic ball valve. The system can realize stepless speed regulation and constant tension control requirement of a guide cable winch, and can solve problems of power loss caused by high-pressure overflow in a conventional hydraulic winch constant tension control system, so as to save energy resources and improve efficiency of a hydraulic system. The system is designed by using an integrated valve block, and the design reduces volume space the system occupies, and reduces the number of system pipelines, and reduces failure rate. The system is convenient to install and maintain, and can realize batch and standardized production.

The invention relates to liquid metal microparticles with core-shell structures and a preparation method and application thereof. Each liquid metal microparticle comprises a core formed by liquid metal and a shell completely wrapping the outer layer of the core, wherein the shell is prepared from an organic high-molecular polymer. The preparation method comprises the steps that the organic high-molecular polymers are dissolved in an organic solvent to form a polymer solution; liquid metal is dropwise added into the polymer solution to disperse the polymer solution into micro-nano particles; and the micro-nano particles are extruded into water through a micropore structure, and thus the liquid metal microparticles with the core-shell structures are obtained after standing. The preparation method of the liquid metal microparticles is convenient and rapid, the sizes of the prepared microparticles can reach the nanometer grade and are uniform and stable, and the problem that the liquid metal microparticles can coagulate again is completely solved. The liquid metal microparticles with the core-shell structures can be quickly prepared in a large scale, and the liquid metal microparticleswith the core-shell structures can be applied to the fields of phase-change microcapsules, nanometer fluids, drug-carrying robots and the like and have excellent application prospects at the industrialization aspect.

The invention provides a block chain accounting method based on dynamic equity. The method comprises the steps that 1, initial equity proportions are set in a genesis block, and the total proportion must reach 100%; 2, weight information of participants is saved; 3, initial voting weights of the participants who apply as bookkeepers are own weights, and cannot be voted to other bookkeepers; the remaining participants can vote for a designated bookkeeper candidate, or may not vote, and voting information at a vote will carry the weights of shares of current voters, and the weights will be addedto the total voting weights of voted persons; 4, after the vote, the bookkeepers of current round are obtained; 5, bookkeeping and consensus are succeeded, block generation is succeeded, and the nextround of bookkeeping applications starts. According to the block chain accounting method based on dynamic equity, an equity algorithm is combined with a block chain to ensure that the block chain technology allows participants to participate in consensus in a more efficient and reasonable way on the basis of achieving an existing distributed ledger technology, decentralization, open and transparency.

The embodiment of the invention discloses a network identification root zone data management method and system based on a blockchain technology. On the basis of an alliance blockchain technology, thejoint maintenance of root zone data management is realized, and the partial decentration of root system management is realized. The method comprises the following steps that: a top level domain registration management mechanism submits a change application to other nodes on an alliance chain through a node which operates the top level domain; other nodes carry out identity verification on the nodewhich operates the top level domain; after the node which operates the top level domain judges to obtain a situation that the identity verification is qualified, the change application of which the identity verification is qualified is submitted to a packaging node on the alliance chain; the packaging node verifies the change application which passes the identity verification, and after verification is qualified, according to the change application which passes the identity verification, the corresponding change information is written into the new block of the alliance chain; and other nodesexcept the packaging node on the alliance chain obtains the new block, and the new block is packaged into the respective alliance chain.

The invention discloses a medical block chain-based payment system and method. In the blockchain payment system, a patient party, a hospital party and a bank party are respectively a node on the blockchain; Information flow, the capital flow and the medicine flow between three parties form an electronic payment system closed loop; a decentralized block chain public chain is set; nodes participating in the system are freely accessed according to the system specification; in a Data layer, a Data block, a Chain type structure, a Hash algorithm, a Merkel tree and a timestamp mechanism are used for storing each piece of payment transaction data and ensuring the safety of data transaction information by using an asymmetric encryption technology; In the network layer, a peer-to-peer network isadopted to organize nodes to dispersedly participate in verification and accounting of transaction data of each time of payment, in the consensus layer, a POS consensus mechanism is adopted, 1% of transaction amount is adopted as a reward to give accounting nodes in the incentive layer, and in the contract layer, intelligent contracts are packaged in the contract layer, so that the advantages of safe, efficient and convenient payment are achieved.

The invention provides an inter-container communication method, a device and an inter-container communication system. The inter-container communication method includes the following steps that: a first virtual bridge sends an address request message to a coordination network element; the first virtual bridge receives the public network address of a target container which is sent by the coordination network element; and the first virtual bridge sends a message of a source container to a second virtual bridge according to the public network address of the target container. According to the inter-container communication method, the device and the inter-container communication system provided by the embodiments of the invention, the virtual bridges are created through different Docker servers; the virtual bridges allocate private network addresses for containers on the Docker servers where the virtual bridges are located; and the containers of the same user which are distributed on different Docker servers obtain the IP addresses and port numbers of the Docker servers where corresponding containers are located through the virtual bridges from the coordination network element and communicate with the corresponding containers according to the IP addresses and port numbers of the Docker servers where the corresponding containers are located. With the inter-container communication method adopted, the communication of the containers of the same user distributed on the different Docker servers in a three-layer network is realized.

The invention discloses a method for preparing graphene by using waste graphite electrodes. According to the method, the waste graphite electrodes in a process of fusing electrolytic metal by additionof ionic bond metal salt are used as raw materials, graphite which is intercalated by metal is stripped from the surface layers of the waste graphite electrodes, the part of graphite is intercalatedat high temperature in a fused salt electrolysis process, then liquid-phase stripping strengthening and elaborate-stage centrifugal classification are carried out, and finally, the graphene is finallyprepared by separation, purification and drying. The prepared graphene has few layers, and is large in specific surface area and low in energy consumption, waste materials are changed into things ofvalue, and the economic value and the social value are high.