Abstract: A fly ash-based fire-prevention and extinguishing material with carbon dioxide mineralized and stored, and a preparation method thereof are provided. The preparation method includes: separately weighing 100 parts to 120 parts of water, 1 part to 3 parts of a solid strong alkali, and 20 parts to 40 parts of a fly ash as raw materials, pouring the raw materials into a reactor successively to obtain a resulting mixture, and stirring the resulting mixture at a high rotational speed; adding 10 parts to 20 parts of a solubilizing agent to the reactor, sealing the reactor, introducing carbon dioxide to the reactor at room temperature to maintain a carbon dioxide pressure to obtain a resulting slurry, and stirring the resulting slurry at a high rotational speed; and further introducing carbon dioxide into the reactor to increase the carbon dioxide pressure, and stirring the resulting slurry at a low rotational speed.

Abstract: The present application relates to a method and system for storing data in a graph database. The method includes: separating a key-value structure of the storage engine and separately storing a graph structure and a graph property of graph data; and reading, by the compute engine, the graph structure, caching the graph structure for a short term in a single query request scenario, and caching the graph structure for a long term in a read-only analysis scenario. The present application resolves problems that engineering is complex and deep graph traversal performance is poor when graph data is processed, reduces engineering complexity, and improves the deep graph traversal performance.

Abstract: A device control method includes a first electronic device that configures a network for a home device using a first home application logged in using a first account, sends, in response to a first user operation, an authorization request to a device server, and receives a first authorization code; the home device receives the first authorization code; the first electronic device outputs the first authorization code; the device server stores second personal information corresponding to the second account; a second electronic device sends account information of the second account and a second authorization code to the home device, wherein a second home application is installed on the second electronic device and is logged in using a second account; the home device performs verification on the second authorization code based on the first authorization code, and when the verification succeeds, stores the account information of the second account.