American engineering index covers almost all fields of engineering technology. For example: electric power, electricity, electronics, automatic control, mining and metallurgy, metal technology, machinery manufacturing, civil engineering, water conservancy and so on. It has the characteristics of strong comprehensiveness, wide data sources, wide geographical coverage, large amount of reports, high quality of reports and strong authority. It has two databases, the core database EI Compendex and the non-core database EI page one. At present, many universities and scientific research institutions have recognized the core database.

2、SCI:

Scientific citation index is a citation database established and published by ISI in 196 1. Comprehensive retrieval journals covering life science, clinical medicine, physical chemistry, agronomy, biology, veterinary medicine, engineering technology, etc. , especially reflecting the academic level of natural science research. It is one of the three largest retrieval systems in the world, and it is also the most famous retrieval category recognized by universities and scientific research institutions in China.

3、CA:

Founded in 1907 and edited and published by China Academy of Sciences, CAS is the most comprehensive and widely used document retrieval tool in the world. This is a highly specialized professional search.

4、CSCD:

The Chinese scientific citation database was founded at 1989, and started at 1999. As a part of China's scientific literature measurement and evaluation series database, it was co-sponsored by the Literature Information Center of China Academy of Sciences and China Academic Journal Electronic Magazine (CD-ROM version), and officially published by Tsinghua Tongfang CD-ROM Electronic Publishing House.

Chinese scientific citation database is divided into core database and extended database. After strict screening, the source periodicals of the core library are authoritative and representative core periodicals in various disciplines. The source journals of the extended database are also widely selected and are excellent journals in various disciplines in China.

5、CSSCI:

Citation Index of Chinese Social Sciences is a landmark project in the field of humanities and social sciences evaluation in China, which was developed by Nanjing University. In short, CSSCI selects the influential journals to enter the database after analyzing the influencing factors of Chinese core journals of Beijing University of Humanities and Social Sciences, and CSSCI is the core of the core! At present, it is in the highest position in the evaluation system of humanities and social sciences journals in China.

Baidu encyclopedia -EI

Baidu encyclopedia -SCI

Baidu encyclopedia -CA

Baidu encyclopedia -CSCD

Baidu encyclopedia -CSSCI