Each search term in a search formula must be clearly marked with a field identifier. Logical operators must be used to connect different fields. This product ignores irrelevant spaces. For example, the space around the left and right brackets () and the equal sign ().
When matching search formulas, please enter a number (#) symbol before each search formula number. SAME can only be used for address retrieval. When used in other retrieval (such as "topic"), the same and have exactly the same function.
You can create up to 200 search expressions in a session.
Extended data
Computer information retrieval, like manual retrieval, should be regarded as a basic skill of future scientific and technological personnel, and the training and cultivation of this ability is extremely important for scientific and technological personnel to adapt to the future society and cross-century scientific research. A researcher who is good at obtaining documents from electronic information systems must have more chances of success than those who do not have this ability. The American periodical POV, which reports the new lifestyle, also lists interactive network retrieval experts as one of the top ten hot jobs in the future. All these situations show that computer literature retrieval is becoming more and more important, so it is worth giving this technology to everyone.
Patents, standards and archives are managed by a country's specialized departments, which are the State Patent Office, the State Bureau of Technical Supervision, the State Archives Bureau and corresponding institutions in various places.
Academic papers are collected by the National Library, China Institute of Science and Technology Information and degree-granting units.
Books, periodicals, meeting records and reports are mainly provided by the national literature information system.
The national document information system includes four systems: science and technology information system, library system of Academy of Social Sciences, university library system and public library system.