1, directory search
Catalogue, also known as bibliography. It is a retrieval tool that records several related books or other types of publications and arranges them in a certain order.
2. Abstract retrieval
Index is a retrieval tool to record titles, authors, topics, names, place names, terms, etc. Articles contained in a batch or category of books, newspapers and periodicals, with their sources indicated, are organized according to a certain sorting method.
An index is different from a directory. It reveals the document units, knowledge units and content items in publications (books, newspapers, periodicals, etc.). ), and indicate the source, so as to facilitate detailed and in-depth retrieval.
3. Index retrieval
It is a short article, which concisely and accurately describes the important contents of the literature, with the purpose of providing a summary of the contents of the literature, without comments or supplementary explanations.
A retrieval tool that collects the abstracts of a large number of documents and arranges them according to certain methods is called abstract retrieval tool, which is abbreviated as abstract.
4、SCI
SCI, a scientific citation index, was founded by institute for scientific information, USA, and contains authors, titles, source journals, abstracts and keywords of documents.
We can not only evaluate the academic value of articles from the perspective of literature citation, but also establish a reference network for research topics quickly and conveniently. SCI was established in 196 1.
After 40 years of development and improvement, it has developed from a single printing type to a powerful electronic, integrated and networked large-scale multidisciplinary comprehensive retrieval system.
5、EI
EI is the abbreviation of engineering index. EI was founded in 1884 and published by engineering information company.
EI is a comprehensive retrieval tool in the field of engineering technology, covering such subjects as electricity, automatic control, power, machinery, instrumentation, material science, agriculture, bioengineering, mathematics, medicine, chemical engineering, food, computer, energy, geology and environment.
Baidu Encyclopedia-Literature Retrieval