SCI and EI are both academic articles, and there is no difference in writing format. As a retrieval tool, SCI is actually very good, and its use is slightly different from other retrieval tools, which I introduced before. The main purpose of other retrieval tools is to "collect all relevant important documents in a specific discipline or scope", while SCI mainly pays attention to the research process through citation, including initiation, inheritance and follow-up. Therefore, there are strict requirements for citations and references when selecting journals.
On the whole, SCI requires the research to be more standardized, systematic, complete and innovative. Some EI publications are still very good, but compared with SCI, the inclusion is too complicated, which is why the recognition of EI is not as good as that of SCI. Therefore, before publishing an El paper, the author should first understand the recognition of EI papers by relevant systems, so as to avoid the situation that it is useless after publication.
El is the oldest large-scale comprehensive retrieval tool founded by the American Society of Engineers in 1884. EI enjoys a high reputation in the academic, engineering and information circles all over the world, and it is recognized as an important retrieval tool by the scientific and technological circles. SCI(ScienceCitation？ Index) is a document retrieval system for sci-tech periodicals established by institute for scientific information (ISI). Journals included in SCI are divided into core areas and peripheral areas. The core part includes more than 3000 periodicals, covering the best scientific and technological periodicals in various disciplines around the world; There are more than 5000 periodicals in the peripheral part, including the core part.